Projection zoom lens and projection type display device
09557538 ยท 2017-01-31
Assignee
Inventors
Cpc classification
G02B13/18
PHYSICS
G02B13/16
PHYSICS
G02B27/646
PHYSICS
International classification
G02B15/14
PHYSICS
G02B13/16
PHYSICS
G02B27/00
PHYSICS
Abstract
A projection zoom lens constituted by: a negative first lens group; a positive final lens group; and moving lens groups between the first and the final lens groups that move independently while changing magnification, satisfies the conditional formulae below:
1.00<(Rf2Rr2)/(Rf2+Rr2)(1)
0.00(Rr2Rf3)/(Rr2+Rf3)<0.15(2)
2.5<Bf/Im(9) wherein Rf2 and Rr2 respectively are the radii of curvature of the front and rear surfaces of the second lens from the magnification side within the most reduction side moving lens group, Rf3 is the radius of curvature of the front surface of the third lens from the magnification side within the most reduction side moving lens group, Bf is the back focus of the entire system at the reduction side at the wide angle end as an air converted length, and Im is the maximum effective image circle diameter at the reduction side.
Claims
1. A projection zoom lens, consisting of: a first lens group, which is provided most toward the magnification side, has a negative refractive power, and is fixed while changing magnification; a final lens group, which is provided most toward the reduction side, has a positive refractive power, and is fixed while changing magnification; and an intermediate group provided between the first lens group and the final lens group, constituted by a plurality of moving lens groups that move independently of each other along the optical axis while changing magnification; the moving lens group provided most toward the reduction side within the intermediate group comprising a lens having a negative refractive power, a lens having a positive refractive power, a lens having a negative refractive power, and a lens having a positive refractive power, provided in this order from the magnification side; and the projection zoom lens satisfying Conditional Formulae (1), (2), and (9) below:
1.00<(Rf2Rr2)/(Rf2+Rr2)(1)
0.00(Rr2Rf3)/(Rr2+Rf3)<0.15(2)
2.5<Bf/Im(9) wherein Rf2 is the radius of curvature of the front surface of the second lens from the magnification side within the lens group most toward the reduction side from among the lens groups that move while changing magnification, Rr2 is the radius of curvature of the rear surface of the second lens from the magnification side within the lens group most toward the reduction side from among the lens groups that move while changing magnification, Rf3 is the radius of curvature of the front surface of the third lens from the magnification side within the lens group most toward the reduction side from among the lens groups that move while changing magnification, Bf is the back focus of the entire system at the reduction side at the wide angle end as an air converted length, and Im is the maximum effective image circle diameter at the reduction side.
2. A projection zoom lens as defined in claim 1 that satisfies Conditional Formulae (3) and (4) below:
0<Nd1Nd2(3)
Nd2<1.60(4) wherein Nd1 is the refractive index with respect to the d line of the first lens from the magnification side within the lens group most toward the reduction side from among the lens groups that move while changing magnification, and Nd2 is the refractive index with respect to the d line of the second lens from the magnification side within the lens group most toward the reduction side from among the lens groups that move while changing magnification.
3. A projection zoom lens as defined in claim 2 that satisfies Conditional Formula (4) below:
Nd2<1.55(4).
4. A projection zoom lens as defined in claim 1, wherein: the lens group provided most toward the reduction side within the intermediate group consists of a lens having a negative refractive power, a lens having a positive refractive power, a lens having a negative refractive power, a lens having a positive refractive power, and a lens having a positive refractive power, provided in this order from the magnification side.
5. A projection zoom lens as defined in claim 1, wherein: only spherical lenses are employed as lenses.
6. A projection zoom lens as defined in claim 1 that satisfies Conditional Formula (5) below:
1.4<Zr(5) wherein Zr is the zoom ratio of the telephoto end with respect to the wide angle end.
7. A projection zoom lens as defined in claim 1 that satisfies Conditional Formula (6) below:
2.0<f1/fw<0.8(6) wherein f1 is the focal length of the first lens group, and fw is the focal length of the entire system at the wide angle end.
8. A projection zoom lens as defined in claim 7 that satisfies Conditional Formula (6) below:
1.8<f1/fw<1.0(6).
9. A projection zoom lens as defined in claim 1 that satisfies Conditional Formula (7) below:
2.0<fe/fw<7.0(7) wherein fe is the focal length of the final lens group, and fw is the focal length of the entire system at the wide angle end.
10. A projection zoom lens as defined in claim 9 that satisfies Conditional Formula (7) below:
3.0<fe/fw<6.0(7).
11. A projection zoom lens as defined in claim 1, wherein: the intermediate group comprises at least a second lens group having a positive refractive power that moves while changing magnification and a third lens group having a positive refractive power that moves while changing magnification, provided in this order from the magnification side, and the projection zoom lens satisfies Conditional Formula (8) below:
3.0<f3/fw<8.0(8) wherein f3 is the focal length of the third lens group, and fw is the focal length of the entire system at the wide angle end.
12. A projection zoom lens as defined in claim 1, wherein: an aperture stop is provided between adjacent moving lens groups of the intermediate group or provided within one of the moving lens groups of the intermediate group; the zoom lens is configured such that the numerical aperture of the zoom lens becomes constant through the entire zoom range; and the projection zoom lens is configured such that the reduction side is telecentric.
13. A projection zoom lens as defined in claim 12, wherein: the aperture stop is a variable stop that changes the aperture diameter thereof while changing magnification such that the numerical aperture of the zoom lens becomes constant through the entire zoom range.
14. A projection zoom lens as defined in claim 12, wherein: the aperture stop is a movable stop that moves independently while changing magnification such that the numerical aperture of the zoom lens becomes constant through the entire zoom range.
15. A projection zoom lens as defined in claim 1 that satisfies Conditional Formula (10) below:
L/Im<12(10) wherein Im is the maximum effective image circle diameter at the reduction side, and L is the distance along the optical axis from the lens surface most toward the magnification side to the lens surface most toward the reduction side when the projection distance is infinity.
16. A projection zoom lens as defined in claim 1 that satisfies Conditional Formula (9) below:
2.8<Nf/Im(9).
17. A projection zoom lens as defined in claim 15 that satisfies Conditional Formula (10) below:
7<L/Im<11(10).
18. A projection type display device, comprising: a light source; a light valve, into which light from the light source enters; and a projection zoom lens as defined in claim 1 that projects optical images formed by light modulated by the light valve onto a screen.
Description
BRIEF DESCRIPTION OF THE DRAWINGS
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BEST MODE FOR CARRYING OUT THE INVENTION
(25) Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. First, a projection zoom lens according to an embodiment of the present invention will be described with reference to
(26)
(27) <<Embodiments Having Six Group Configurations>>
(28) First, the projection zoom lenses of Examples 1 through 9 that have six group configurations will be described. The basic configurations of these projection zoom lenses are similar to that of Example 1 other than portions that will be particularly described in detail. Therefore, the embodiments will be described mainly with reference to the configuration illustrated in
(29) The projection zoom lens of the present embodiment is capable of being mounted in a projection type display device for displaying digital projected images for use in cinema theaters and the like. For example, the projection zoom lens of the present embodiment may be utilized as a projection lens that projects image information displayed by a light valve onto a screen. In
(30) In the projection type display device, light beams, to which the image information is imparted by the image display surface, enter the projection zoom lens via the glass blocks 2 and 1. The projection zoom lens projects the beams onto a screen (not shown) disposed toward the left side direction of the drawing sheet.
(31) Note that although the position of the surface of the glass block 2 toward the reduction side and the position of the image display surface are the same in the above description, the projection zoom lens of the present invention is not limited to such a configuration. In addition, there is only one image display surface in the above description. However, the projection type display device may be configured to separate beams from a light source into three primary colors with a color separating optical system. In this case, three light valves that respectively correspond to the three primary colors may be provided, to enable display of full color images.
(32) The projection zoom lens of the present embodiment consists essentially of: a first lens group G1, which is provided most toward the magnification side, has a negative refractive power, and is fixed while changing magnification; a second lens group G2, which is positioned at the reduction side after the first lens group G1, has a positive refractive power, and moves while changing magnification; a third lens group G3 which is positioned at the reduction side after the second lens group G2, has a positive refractive power, and moves while changing magnification; a fourth lens group G4 which is positioned at the reduction side after the third lens group G3, has a positive refractive power, and moves while changing magnification; a fifth lens group G5 which is positioned at the reduction side after the fourth lens group G4, has a negative refractive power, and moves while changing magnification; and a sixth lens group G6, which is provided most toward the reduction side, has a positive refractive power, and is fixed while changing magnification. The projection zoom lens of the present embodiment is configured such that the reduction side is telecentric. The configuration of the lens groups described above is common to Examples 1 through 4. Note that in the present embodiment, the second through fifth lens groups constitute the intermediate group of the present invention.
(33) This projection zoom lens is configured to perform focusing operations by moving the first lens group G1.
(34) In the example illustrated in
(35) However, the numbers of lenses that constitute each of the lens groups are not necessarily limited to those of the example illustrated in
(36) In the projection zoom lens of the present embodiment, the aperture stop St provided in the fourth lens group G4 is a variable stop that changes the aperture diameter thereof such that the numerical aperture of the zoom lens is constant through the entire zoom range. This point is also common to all of the other Examples other than Example 9, including cases in which the position at which the aperture stop St is provided is different.
(37) The projection zoom lens of the present embodiment satisfies Conditional Formulae (1) and (2) below.
1.00<(Rf2Rr2)/(Rf2+Rr2)(1)
0.00(Rr2Rf3)/(Rr2+Rf3)<0.15(2)
(38) wherein Rf2 is the radius of curvature of the front surface of the second lens from the magnification side within the lens group most toward the reduction side from among the lens groups that move while changing magnification, Rr2 is the radius of curvature of the rear surface of the second lens from the magnification side within the lens group most toward the reduction side from among the lens groups that move while changing magnification, and Rf3 is the radius of curvature of the front surface of the third lens from the magnification side within the lens group most toward the reduction side from among the lens groups that move while changing magnification.
(39) The projection zoom lens of the present embodiment is capable of maintaining high performance even when configured to have a high zoom ratio, by Conditional Formulae (1) and (2) being satisfied. Particularly, it will become possible to suppress fluctuations in spherical aberration, distortion, and field curvature caused by changes in magnification.
(40) Note that values of each of the Examples related to the conditions defined in Conditional Formulae (1) through (10) are summarized and shown in Table 24. In addition, Table 25 shows conditions related to Conditional Formulae (1) through (10) as well as other main conditions of the Examples. In Table 25, f2, f4, and f5 are the focal lengths of the second lens group, the fourth lens group, and the fifth lens group, respectively.
(41) The projection zoom lens of the present embodiment satisfies Conditional Formulae (3) and (4) below:
0<Nd1Nd2(3)
Nd2<1.60(4)
(42) wherein Nd1 is the refractive index with respect to the d line of the first lens from the magnification side within the lens group most toward the reduction side from among the lens groups that move while changing magnification, and Nd2 is the refractive index with respect to the d line of the second lens from the magnification side within the lens group most toward the reduction side from among the lens groups that move while changing magnification.
(43) The advantageous effects obtained by Conditional Formulae (1) and (2) being satisfied are more prominent, by the projection zoom lens of the present embodiment satisfying Conditional Formulae (3) and (4).
(44) In the present embodiment, aforementioned Conditional Formula (4) is satisfied within the range defined by Conditional Formula (4). Therefore, the above advantageous effects are even more prominent.
(45) In addition, the zoom lens of the present embodiment satisfies Conditional Formula (5) below.
1.4<Zr(5)
(46) wherein Zr is the zoom ratio of the telephoto end with respect to the wide angle end. Thereby, the projection zoom lens of the present embodiment secures a high zoom ratio and the utilizable range thereof can be broadened.
(47) In addition, the projection zoom lens of the present embodiment satisfies Conditional Formula (6) below.
2.0<f1/fw<0.8(6)
(48) wherein f1 is the focal length of the first lens group, and fw is the focal length of the entire system at the wide angle end. Thereby, the projection zoom lens of the present embodiment is being capable of being formed compact, can secure a sufficient amount of back focus, and further can suppress field curvature and distortion. The detailed reasons therefor are as described earlier.
(49) The present embodiment satisfies aforementioned Conditional Formula (6) within the range defined by Conditional Formula (6). Therefore, the above advantageous effects are particularly prominent.
(50) The projection zoom lens of the present embodiment satisfies Conditional Formula (7) below.
2.0<fe/fw<7.0(7)
(51) wherein fe is the focal length of the final lens group G6, and fw is the focal length of the entire system at the wide angle end. Thereby, the projection zoom lens of the present embodiment can favorably correct spherical aberration, can reduce the outer diameters of the lenses of the first lens groups toward the magnification side, resulting in being capable of being formed compact, and further can suppress the amount of spherical aberration at the telephoto end. The detailed reasons therefor are as described earlier.
(52) The present embodiment satisfies aforementioned Conditional Formula (7) within the range defined by Conditional Formula (7). Therefore, the above advantageous effects are particularly prominent.
(53) Further, in the projection zoom lens of the present embodiment, the intermediate group comprises the second lens group G2 having a positive refractive power that moves while changing magnification and the third lens group G3 having a positive refractive power that moves while changing magnification, provided in this order from the magnification side, and all of the Examples other than Examples 1 and 2 satisfy Conditional Formula (8) below.
3.0<f3/fw<8.0(8)
(54) wherein f3 is the focal length of the third lens group, and fw is the focal length of the entire system at the wide angle end. In this case, the projection zoom lens of the present embodiment will be capable of favorably correcting field curvature and lateral chromatic aberration, while suppressing the total length of the projection zoom lens. The reasons therefor are as described in detail previously.
(55) In addition, the projection zoom lens of the present embodiment satisfies Conditional Formulae (9) and (10) below.
2.5<Bf/Im(9)
L/Im<12(10)
(56) wherein Bf is the back focus (an air converted length) of the entire system at the reduction side at the wide angle end, limp is the maximum effective image circle diameter (image circle diameter) at the reduction side, and L is the distance along the optical axis from the lens surface most toward the magnification side (the surface of the first lens L1 toward the magnification side) to the lens surface most toward the reduction side (the surface of the fifteenth lens L15 toward the reduction side) when the projection distance is infinity. The projection zoom lens of the present embodiment is capable of having a sufficiently long back focus, by Conditional Formula (9) being satisfied. As a result, insertion of the aforementioned prism will be facilitated. The reason therefor is as described in detail earlier.
(57) The present embodiment further satisfies aforementioned Conditional Formula (9) within the range defined by Conditional Formula (9). Therefore, the above advantageous effects are particularly prominent.
(58) Meanwhile, the total length of the projection zoom lens of the present embodiment can be shortened, by Conditional Formula (10) being satisfied.
(59) The present embodiment further satisfies Conditional Formula (10) within the range defined by Conditional Formula (10). Therefore, the above advantageous effect is particularly prominent, and chromatic aberration can be favorably corrected.
(60) Next, embodiments having six group configurations different from the configuration of the lens groups described above will be described. The projection zoom lens according to an embodiment, of which sectional diagrams are illustrated in
(61) The above configuration differs from that of the projection zoom lens of Example 1 described previously in the points that the fourth lens group G4 has a negative refractive power, and the fifth lens group G5 has a positive refractive power.
(62) The projection zoom lens of Example 5 and Example 6 according to the embodiment illustrated in
(63) Next, other embodiments having six group configurations which are again different from the configuration of the lens groups described above will be described. The projection zoom lens according to an embodiment, of which sectional diagrams are illustrated in
(64) The above configuration basically differs from that of the projection zoom lens of Example 1 described previously in the point that the fifth lens group G5 has a positive refractive power.
(65) The projection zoom lens of Example 7, 8, and 9 according to the embodiment illustrated in
(66) <<Embodiments Having Five Group Configurations>>
(67) Next, embodiments having five group configurations will be described with reference mainly to
(68) In the example illustrated in
(69) The projection zoom lens of Example 10 and 11 according to the embodiment illustrated in
(70) Next, embodiments of a projection type display device of the present invention will be described with reference to
(71) The white light L output by the light source 17 is separated into three colored light beams (G light, B light, and R light) by the dichroic mirrors 12 and 13. The three colored light beams pass through the polarization splitting prisms 15a through 15c, then enter the reflective display elements 11a through 11c corresponding each of the light beams and are optically modulated thereby. Then, the colored light beams are combined by the cross dichroic prism 14, and enter a projection zoom lens 19 according to an embodiment of the present invention. The projection zoom lens 19 projects an optical image formed by the light that enters thereinto onto a screen 100.
(72) Next,
(73) The white light L output by the light source 27 passes through the polarization splitting prism 25, then is separated into three colored light beams (G light, B light, and R light) by the TIR prisms 24a through 24c. The three colored light beams enter the reflective display elements 21a through 21c corresponding each of the light beams and are optically modulated thereby. Then, the optically modulated light beams propagate through the TIR prisms 24a through 24c in the reverse direction such that the colors are combined, pass through the polarization splitting prism 25, and enter a projection zoom lens 29 according to an embodiment of the present invention. The projection zoom lens 29 projects an optical image formed by the light that enters thereinto onto a screen 100.
(74) Note that reflective liquid crystal display elements, DMD's, or the like may be employed as the reflective display elements 11a through 11c and 21a through 21c.
(75) Next, specific examples of the projection zoom lens of the present invention will be described. Note that the projection zoom lenses of Examples 1 through 9 to be described hereunder all have six group configurations, and the projection zoom lenses of Examples 10 and 11 both have five group configurations.
Example 1
(76)
(77) In the projection zoom lens of Example 1, the first lens group G1 is constituted by four lenses, which are a first lens L1 having a positive refractive power (hereinafter, lenses will simply be referred to as positive or negative), a negative second lens L2, a negative third lens L3, and a negative fourth lens L4, provided in this order from the magnification side. The second lens group G2 is constituted by two lenses, which are a negative fifth lens L5 and a positive sixth lens L6, provided in this order from the magnification side.
(78) The third lens group G3 is constituted by two lenses, which are a positive seventh lens L7 and a negative eighth lens L8, provided in this order from the magnification side. The fourth lens group G4 is constituted by an aperture stop St, which is a variable stop, and a positive ninth lens L9.
(79) The fifth lens group G5 is constituted by five lenses, which are a negative tenth lens L10, a positive eleventh lens L11, a negative twelfth lens L12, a positive thirteenth lens L13, and a positive fourteenth lens L14, provided in this order from the magnification side. The sixth lens group G6 is constituted by a single positive fifteenth lens L15. Note that the twelfth lens L12 and the thirteenth lens L13 are cemented together.
(80) Table 1 shows basic lens data of the projection zoom lens of Example 1. Data regarding glass blocks 2 and 1 are also shown here. In Table 1, ith (i=1, 2, 3, . . . ) lens surface numbers that sequentially increase from the magnification side to the reduction side, with the lens surface at the most object side designated as first, are shown in the column Si. The radii of curvature of ith surfaces are shown in the column Ri, the distances between an ith surface and an i+1st surface along the optical axis Z are shown in the column Di. The refractive indices of jth (j=1, 2, 3, . . . ) constituent elements that sequentially increase from the magnification side to the reduction side, with the lens at the most magnification side designated as first, with respect to the d line (wavelength: 587.6 nm) are shown in the column Ndj. The Abbe's numbers of the jth constituent elements with respect to the d line are shown in the column vdj.
(81) Note that the radii of curvature R and the values of the distances D are values which are normalized by designating the focal length of the entire projection zoom lens at the wide angle end as 10.00. In addition, Table 1 shows numerical values which are rounded off at a predetermined number of digits. In addition, in Table 1, the signs of the radii of curvature are positive in cases that the surface shape is convex toward the magnification side, and negative in cases that the surface shape is convex toward the reduction side.
(82) Among the distances D, the distance between the first lens group G1 and the second lens group G2, the distance between the second lens group G2 and the third lens group G3, the distance between the third lens group G3 and the fourth lens group G4, the distance between the fourth lens group G4 and the fifth lens group G5, and the distance between the fifth lens group G5 and the sixth lens group G6 change when changing magnification. The letters DD are appended to the surface number toward the front of these distances and shown as DD8, DD11, DD15, DD18, and DD27 in the columns of the distances between surfaces corresponding to these distances.
(83) The above is the same for Tables 3, 5, 7, 9, 11, 14, 16, 18, 20, and 22 to be described later. Note that with respect to the aforementioned variable distances among lens groups, the number that follows the letters DD are different according to the number of constituent elements in each Example. However, that letters DD are appended to the surface number toward the front of these distances is the same in all of the above tables. In addition, the symbol * is appended to aspherical surfaces.
(84) Table 2 shows the values of the focal length f of the entire system, the back focus Bf (air converted distance), the distances DD8, DD11, DD15, DD18, and DD27, and the stop diameter of the aperture stop (aperture diameter: represented as diameters) of the projection zoom lens of Example 1 when changing magnification at the wide angle end, the intermediate position, and the telephoto end. These numerical values are also values which are normalized by designating the focal length of the entire projection zoom lens at the wide angle end as 10.00. In addition, these values are for a case in which the projection distance is infinity. In addition, Table 2 also shows the values of the zoom magnification rate (designating the wide angle end as 1.00), the F number (numerical aperture) FNo., and the full angle of view 2 (using degrees as the unit) of the zoom lens of Example 1. The F number is maintained constant at 2.5, which is sufficiently smaller than the aforementioned value of 3.0. This is the same for Examples 2 through 11 to be described later.
(85) The manner in which the items of Table 2 are shown is the same for Tables 4, 6, 8, 10, 12, 15, 17, 19, 21, and 23 as well.
(86) TABLE-US-00001 TABLE 1 Example 1: Basic Lens Data Ri dj Si (Radius of Di Ndj (Abbe's (Surface Number) Curvature) (Distance) (Refractive Index) Number) 1 71.9343 3.715 1.62299 58.16 2 0.107 3 39.2386 1.148 1.61800 63.33 4 19.4267 3.886 5 61.3212 0.966 1.71299 53.87 6 23.6763 5.903 7 30.5448 0.858 1.61800 63.33 8 81.9992 DD [8] 9 0.971 1.84661 23.78 10 27.2828 6.802 1.72047 34.71 11 44.9101 DD [11] 12 35.6924 3.256 1.67270 32.10 13 164.3529 5.921 14 39.5138 0.805 1.49700 81.54 15 16.1272 DD [15] 16 8.985 (aperture stop) 17 132.4478 2.145 1.49700 81.54 18 25.7826 DD [18] 19 27.4801 0.536 1.61772 49.81 20 27.4801 0.579 21 103.8717 2.379 1.48749 70.23 22 16.3936 0.473 23 12.5784 0.649 1.77250 49.60 24 52.1011 3.203 1.49700 81.54 25 18.1370 3.093 26 252.4568 4.204 1.49700 81.54 27 18.6515 DD [27] 28 52.7115 2.898 1.49700 81.54 29 52.7115 9.661 30 37.550 1.51633 64.14 31 1.609 1.50847 61.19 32
(87) TABLE-US-00002 TABLE 2 Example 1: Data Related to Zoom Wide Angle Intermediate Telephoto Zoom Ratio 1.00 1.20 1.43 f 10.00 11.96 14.30 Bf 35.49 35.49 35.49 FNo. 2.50 2.50 2.50 2 () 62.8 54.2 46.2 DD [8] 15.342 10.968 9.388 DD [11] 14.078 8.183 0.654 DD [15] 24.171 23.075 22.125 DD [18] 0.776 7.024 13.512 DD [27] 0.269 5.386 8.956 Stop 10.858 12.28 13.678 Diameter
(88) Here, the spherical aberration, the astigmatism, the distortion, and the lateral chromatic aberration (chromatic aberration of magnification) of the projection zoom lens of Example 1 at the wide angle end are respectively illustrated in A through D of
(89) Each of A through L of
(90) The diagrams of lens arrangements, the symbols in the Tables and the diagrams that illustrate aberrations, the meanings thereof, and the manners in which they are shown for Example 1 basically apply to Examples 2 through 11 to be described below, unless otherwise noted. In addition, the points that the lens arrangement diagrams of Example 1 (
Example 2
(91)
(92) A third lens group G3 is constituted by two lenses, which are a positive seventh lens L7 and a negative eighth lens L8, provided in this order from the magnification side. A fourth lens group G4 is constituted by and an aperture stop St, which is a variable stop, and a positive ninth lens L9 provided in this order from the magnification side.
(93) A fifth lens group G5 is constituted by five lenses, which are a negative tenth lens L10, a positive eleventh lens L11, a negative twelfth lens L12, a positive thirteenth lens L13, and a positive fourteenth lens L14, provided in this order from the magnification side. A sixth lens group G6 is constituted by a two lenses, which are a negative fifteenth lens L15 and a positive sixteenth lens L16.
(94) Note that the fifth lens L5 and the sixth lens L6 are cemented together, the twelfth lens L12 and the thirteenth lens L13 are cemented together, and the fifteenth lens L15 and the sixteenth lens L16 are cemented together as well.
(95) Table 3 shows basic lens data of the projection zoom lens of Example 2. In addition, Table 4 shows data related to items at the wide angle end, the intermediate position, and the telephoto end as the projection zoom lens of Example 2 changes magnification, in the same manner as Table 2. The items and the manners in which they are shown are as described previously.
(96) TABLE-US-00003 TABLE 3 Example 2: Basic Lens Data Ri dj Si (Radius of Di Ndj (Abbe's (Surface Number) Curvature) (Distance) (Refractive Index) Number) 1 47.6244 4.170 1.62299 58.16 2 342.8017 0.107 3 38.4051 1.147 1.61800 63.33 4 17.8824 4.848 5 82.6651 0.965 1.71299 53.87 6 22.3424 6.268 7 25.5241 0.857 1.61800 63.33 8 195.3033 DD [8] 9 57.4995 0.970 1.84661 23.78 10 36.2694 6.107 1.74950 35.33 11 28.6044 DD [11] 12 36.6738 2.742 1.71736 29.52 13 286.0788 1.765 14 34.3412 0.804 1.49700 81.54 15 18.7183 DD [15] 16 8.975 (aperture stop) 17 139.0259 2.143 1.49700 81.54 18 29.3123 DD [18] 19 27.4161 0.536 1.78800 47.37 20 27.6022 0.493 21 61.9035 2.880 1.51742 52.43 22 16.0045 0.454 23 12.9940 0.648 1.78800 47.37 24 27.7002 3.574 1.61800 63.33 25 25.4591 0.000 26 65.3022 3.855 1.61800 63.33 27 21.3736 DD [27] 28 46.6856 0.755 1.71299 53.87 29 21.6274 4.635 1.49700 81.54 30 37.7068 9.646 31 37.509 1.51633 64.14 32 1.608 1.50847 61.19 33
(97) TABLE-US-00004 TABLE 4 Example 2: Data Related to Zoom Wide Angle Intermediate Telephoto Zoom Ratio 1.00 1.20 1.43 f 10.00 11.96 14.30 Bf 35.45 35.45 35.45 FNo. 2.50 2.50 2.50 2 () 62.8 54.2 46.2 DD [8] 6.954 4.636 5.053 DD [11] 15.673 9.320 0.531 DD [15] 34.389 32.115 30.937 DD [18] 0.931 7.963 15.246 DD [27] 0.269 4.183 6.449 Stop 11.298 12.734 14.12 Diameter
(98) Meanwhile, A through L of
Example 3
(99)
(100) A third lens group G3 is constituted by two lenses, which are a positive seventh lens L7 and a negative eighth lens L8, provided in this order from the magnification side. A fourth lens group G4 is constituted by an aperture stop St, which is a variable stop, and a positive ninth lens L9, provided in this order from the magnification side.
(101) A fifth lens group G5 is constituted by five lenses, which are a negative tenth lens L10, a positive eleventh lens L11, a negative twelfth lens L12, a positive thirteenth lens L13, and a positive fourteenth lens L14, provided in this order from the magnification side. A sixth lens group G6 is constituted by a single positive fifteenth lens L15.
(102) Note that the fifth lens L5 and the sixth lens L6 are cemented together, and the twelfth lens L12 and the thirteenth lens L13 are cemented together as well.
(103) Table 5 shows basic lens data of the projection zoom lens of Example 3. In addition, Table 6 shows data related to items at the wide angle end, the intermediate position, and the telephoto end as the projection zoom lens of Example 3 changes magnification, in the same manner as Table 2. The items and the manners in which they are shown are as described previously.
(104) TABLE-US-00005 TABLE 5 Example 3: Basic Lens Data Ri dj Si (Radius of Di Ndj (Abbe's (Surface Number) Curvature) (Distance) (Refractive Index) Number) 1 47.0437 3.350 1.67003 47.23 2 330.2142 0.097 3 34.7902 1.015 1.62299 58.16 4 16.7348 3.911 5 117.0256 0.890 1.62041 60.29 6 22.4972 4.230 7 32.0741 0.774 1.62299 58.16 8 60.4108 DD [8] 9 119.2924 0.779 1.84661 23.78 10 24.8416 5.371 1.73800 32.26 11 37.2610 DD [11] 12 34.9176 2.678 1.74950 35.28 13 188.1975 6.730 14 25.4222 0.725 1.48749 70.23 15 14.8481 DD [15] 16 7.735 (aperture stop) 17 113.1459 2.379 1.49700 81.54 18 24.3331 DD [18] 19 21.3273 0.532 1.74320 49.34 20 26.4153 0.450 21 65.3902 3.128 1.51633 64.14 22 13.4188 0.280 23 11.7678 0.633 1.77250 49.60 24 71.5360 3.486 1.49700 81.54 25 18.6012 0.793 26 124.6524 4.046 1.49700 81.54 27 17.0531 DD [27] 28 39.7147 2.683 1.49700 81.54 29 63.1218 8.717 30 33.841 1.51633 64.14 31 1.450 1.50847 61.19 32
(105) TABLE-US-00006 TABLE 6 Example 3: Data Related to Zoom Wide Angle Intermediate Telephoto Zoom Ratio 1.00 1.32 1.58 f 10.00 13.20 15.80 Bf 0.01 0.01 0.01 FNo. 2.50 2.50 2.50 2 () 57.8 45.2 38.4 DD [8] 11.670 8.093 7.465 DD [11] 15.386 6.207 0.578 DD [15] 21.430 19.285 17.350 DD [18] 0.941 9.383 16.288 DD [27] 0.244 6.704 7.991 Stop Diameter 10.142 12.2748 13.7542
(106) Meanwhile, A through L of
Example 4
(107)
(108) A third lens group G3 is constituted by two lenses, which are a positive seventh lens L7 and a negative eighth lens L8, provided in this order from the magnification side. A fourth lens group G4 is constituted by an aperture stop St, which is a variable stop, and a positive ninth lens L9, provided in this order from the magnification side.
(109) A fifth lens group G5 is constituted by five lenses, which are a negative tenth lens L10, a positive eleventh lens L11, a negative twelfth lens L12, a positive thirteenth lens L13, and a positive fourteenth lens L14, provided in this order from the magnification side. A sixth lens group G6 is constituted by a single positive fifteenth lens L15.
(110) Note that the fifth lens L5 and the sixth lens L6 are cemented together and the twelfth lens L12 and the thirteenth lens L13 are cemented together as well.
(111) Table 7 shows basic lens data of the projection zoom lens of Example 4. In addition, Table 8 shows data related to items at the wide angle end, the intermediate position, and the telephoto end as the projection zoom lens of Example 4 changes magnification, in the same manner as Table 2. The items and the manners in which they are shown are as described previously.
(112) TABLE-US-00007 TABLE 7 Example 4: Basic Lens Data Ri dj Si (Radius of Di Ndj (Abbe's (Surface Number) Curvature) (Distance) (Refractive Index) Number) 1 50.0884 3.237 1.70154 41.24 2 384.8019 0.097 3 35.9455 1.015 1.63854 55.38 4 17.3466 3.760 5 108.3901 0.894 1.62041 60.29 6 21.7691 4.354 7 31.7646 0.774 1.58913 61.14 8 60.9474 DD [8] 9 96.9782 0.827 1.84661 23.78 10 24.7320 5.402 1.73800 32.26 11 36.3082 DD [11] 12 34.6544 2.666 1.74950 35.28 13 217.1542 7.002 14 25.6579 0.725 1.48749 70.23 15 15.0992 DD [15] 16 7.614 (aperture stop) 17 111.3602 3.449 1.49700 81.54 18 24.7471 DD [18] 19 21.5612 0.532 1.72916 54.68 20 27.6715 0.429 21 63.9589 3.097 1.48749 70.23 22 13.5757 0.290 23 11.9088 0.633 1.78800 47.37 24 50.0219 3.319 1.53715 74.81 25 19.6002 0.484 26 121.8129 4.030 1.53715 74.81 27 17.3652 DD [27] 28 39.9649 2.651 1.49700 81.54 29 64.6217 8.716 30 33.841 1.51633 64.14 31 1.450 1.50847 61.19 32
(113) TABLE-US-00008 TABLE 8 Example 4: Data Related to Zoom Wide Angle Intermediate Telephoto Zoom Ratio 1.00 1.32 1.58 f 10.00 13.20 15.80 Bf 0.01 0.01 0.01 FNo. 2.50 2.50 2.50 2 () 57.8 45.2 38.2 DD [8] 10.981 7.638 7.110 DD [11] 15.359 6.112 0.579 DD [15] 21.494 19.273 17.158 DD [18] 0.972 9.667 16.934 DD [27] 0.250 6.366 7.275 Stop 10.217 12.3132 13.7752 Diameter
(114) Meanwhile, A through L of
Example 5
(115)
(116) A third lens group G3 is constituted by a single positive seventh lens L7. A fourth lens group G4 is constituted by an aperture stop St, which is a variable stop, and a negative eighth lens L8, provided in this order from the magnification side.
(117) A fifth lens group G5 is constituted by five lenses, which are a negative ninth lens L9, a positive tenth lens L10, a negative eleventh lens L11, a positive twelfth lens L12, and a positive thirteenth lens L13, provided in this order from the magnification side. A sixth lens group G6 is constituted by a single positive fourteenth lens L14.
(118) Note that the fifth lens L5 and the sixth lens L6 are cemented together, and the twelfth lens L12 and the thirteenth lens L13 are cemented together as well.
(119) Table 9 shows basic lens data of the projection zoom lens of Example 5. In addition, Table 10 shows data related to items at the wide angle end, the intermediate position, and the telephoto end as the projection zoom lens of Example 5 changes magnification, in the same manner as Table 2. The items and the manners in which they are shown are as described previously.
(120) TABLE-US-00009 TABLE 9 Example 5: Basic Lens Data Ri Ndj dj Si (Radius of Di (Refractive (Abbe's (Surface Number) Curvature) (Distance) Index) Number) 1 48.1363 3.632 1.62299 58.16 2 1316.2876 0.614 3 33.0425 1.025 1.63854 55.38 4 15.6313 3.864 5 378.8269 0.885 1.72342 37.95 6 22.6357 3.917 7 25.7503 0.774 1.61800 63.33 8 25.7503 DD [8] 9 53.8423 0.924 1.74077 27.79 10 15.7094 8.168 1.73800 32.26 11 36.5776 DD [11] 12 43.9205 2.554 1.51823 58.90 13 72.8993 DD [13] 14 (aperture stop) 4.836 15 29.9496 0.580 1.77250 49.60 16 73.3444 DD [16] 17 228.2400 0.580 1.80610 33.27 18 16.9946 0.088 19 18.1462 5.615 1.49700 81.61 20 9.2265 0.064 21 9.0930 0.658 1.83481 42.73 22 51.9940 3.806 1.62004 36.26 23 21.5508 0.783 24 4.178 1.49700 81.61 25 15.0657 DD [25] 26 38.3182 1.978 1.70154 41.24 27 8.756 28 33.853 1.51633 64.14 29 1.451 1.50847 61.19 30
(121) TABLE-US-00010 TABLE 10 Example 5: Data Related to Zoom Wide Angle Intermediate Telephoto Zoom Ratio 1.00 1.32 1.58 f 10.00 13.20 15.80 Bf 0.05 0.05 0.05 FNo. 2.50 2.50 2.50 2 () 57.6 45.2 38.2 DD [8] 6.511 5.643 5.833 DD [11] 31.331 17.426 4.533 DD [13] 9.979 19.688 21.827 DD [16] 8.827 4.475 5.615 DD [25] 0.231 9.645 19.071 Stop Diameter 10.1512 10.9926 11.6166
(122) Meanwhile, A through L of
Example 6
(123)
(124) A third lens group G3 is constituted by a single positive sixth lens L6. A fourth lens group G4 is constituted by a negative seventh lens L7 and an aperture stop St, which is a variable stop, provided in this order from the magnification side.
(125) A fifth lens group G5 is constituted by five lenses, which are a negative eighth lens L8, a positive ninth lens L9, a negative tenth lens L10, a positive eleventh lens L11, and a positive twelfth lens L12, provided in this order from the magnification side. A sixth lens group G6 is constituted by a single positive thirteenth lens L13.
(126) Note that the fourth lens L4 and the fifth lens L5 are cemented together, the eighth lens L8 and the ninth lens L9 are cemented together, and the tenth lens L10 and the eleventh lens L11 are cemented together as well. In addition, the second lens L2 is formed by a thin resin layer which is adhesively attached to the surface of the first lens L1 toward the reduction side, and forms a compound aspherical surface.
(127) Table 11 shows basic lens data of the projection zoom lens of Example 6. In addition, Table 12 shows data related to items at the wide angle end, the intermediate position, and the telephoto end as the projection zoom lens of Example 6 changes magnification, in the same manner as Table 2. The items and the manners in which they are shown are as described previously.
(128) In Example 6, the surface of the second lens L2 toward the reduction side (the surface having surface number 3) is an aspherical surface. Therefore, Table 13 shows data related to the aspherical surface. The aspherical surface data of Table 13 shows the surface number of aspherical surfaces and aspherical surface coefficients related to each aspherical surface. In the numerical values shown as the aspherical surface data in Table 13, the symbol E-n (n is an integer) indicates that the numerical value is to be multiplied by 10. Note that the aspherical surface coefficients are the values of coefficients KA and Am (m=3, 4, 16) in the aspherical surface shape formula below.
Zd=C.Math.h.sup.2/{1+(1KA.Math.C.sup.2.Math.h.sup.2).sup.1/2}+Am.Math.h.sup.m
(129) wherein: Zd is the depth of the aspherical surface (the length of a normal line that extends from a point on the aspherical surface having a height h to a plane perpendicular to the optical axis that contacts the apex of the aspherical surface), h is the height (the distance from the optical axis to the surface of the lens, C is the inverse of the paraxial radius of curvature, and KA and Am are aspherical surface coefficients (m=3, 4, 5, . . . , 16).
(130) TABLE-US-00011 TABLE 11 Example 6: Basic Lens Data Ri Ndj dj Si (Radius of Di (Refractive (Abbe's (Surface Number) Curvature) (Distance) Index) Number) 1 38.8679 0.872 1.67003 47.23 2 12.8384 0.073 1.52771 41.86 *3 11.2617 5.209 4 46.1298 0.751 1.49700 81.54 5 24.9090 DD [5] 6 30.7719 0.780 1.74077 27.79 7 12.3571 6.351 1.73800 32.26 8 62.9591 DD [8] 9 30.4509 2.257 1.51742 52.43 10 69.9484 DD [10] 11 22.3193 0.509 1.72916 54.68 12 4825.4325 1.453 13 (aperture stop) DD [13] 14 156.9934 0.587 1.80400 46.58 15 12.6311 4.398 1.49700 81.54 16 10.8480 0.222 17 9.8962 1.217 1.80400 46.58 18 104.4568 5.189 1.49700 81.54 19 17.4220 0.096 20 138.5610 4.469 1.49700 81.54 21 16.4603 DD [21] 22 51.6540 2.155 1.67003 47.23 23 152.6019 8.770 24 33.914 1.51633 64.14 25 1.453 1.50847 61.19 26 *aspherical surface
(131) TABLE-US-00012 TABLE 12 Example 6: Data Related to Zoom Wide Angle Intermediate Telephoto Zoom Ratio 1.00 1.32 1.58 f 10.00 13.20 15.80 Bf 0.05 0.05 0.05 FNo. 2.50 2.50 2.50 2 () 57.8 45.0 38.2 DD [5] 10.522 6.788 5.561 DD [8] 19.225 9.646 0.483 DD [10] 1.370 8.118 11.244 DD [13] 9.613 8.009 8.039 DD [21] 0.228 8.397 15.631 Stop Diameter 8.6432 9.3216 9.806
(132) TABLE-US-00013 TABLE 13 Example 6: Aspherical Surface Data Surface Number 3 KA 1.0000000E+00 A3 6.7776168E06 A4 5.7833183E05 A5 4.9497647E06 A6 2.0585791E06 A7 2.1978980E07 A8 1.3484847E07 A9 4.9158816E08 A10 7.3692226E09 A11 6.1627499E10 A12 4.8390077E11 A13 5.2879972E12 A14 3.9439680E13 A15 1.1068858E14 A16 2.1443745E17
(133) Meanwhile, A through L of
Example 7
(134)
(135) A third lens group G3 is constituted by a positive sixth lens L6 and a negative seventh lens L7, provided in this order from the magnification side. A fourth lens group G4 is constituted by a single positive eighth lens L8.
(136) A fifth lens group G5 is constituted by an aperture stop St, which is a variable stop, and five lenses, which are a negative ninth lens L9, a positive tenth lens L10, a negative eleventh lens L11, a positive twelfth lens L12, and a positive thirteenth lens L13, provided in this order from the magnification side. A sixth lens group G6 is constituted by a single positive fourteenth lens L14.
(137) Note that the fourth lens L4 and the fifth lens L5 are cemented together, and the eleventh lens L11 and the twelfth lens L12 are cemented together as well.
(138) Table 14 shows basic lens data of the projection zoom lens of Example 7. In addition, Table 15 shows data related to items at the wide angle end, the intermediate position, and the telephoto end as the projection zoom lens of Example 7 changes magnification, in the same manner as Table 2.
(139) TABLE-US-00014 TABLE 14 Example 7: Basic Lens Data Ri Ndj dj Si (Radius of Di (Refractive (Abbe's (Surface Number) Curvature) (Distance) Index) Number) 1 57.1672 2.570 1.63854 55.38 2 119.3632 1.522 3 28.2685 1.054 1.77250 49.60 4 13.3522 3.773 5 22.6907 0.851 1.80518 25.42 6 30.2483 DD [6] 7 16.7245 0.871 1.63854 55.38 8 72.0209 2.441 1.73800 32.26 9 16.5806 DD [9] 10 40.8653 2.529 1.72047 34.71 11 40.8653 0.130 12 35.7758 0.758 1.62004 36.26 13 100.5522 DD [13] 14 33.8872 2.758 1.49700 81.54 15 50.9500 DD [15] 16 (aperture stop) 1.986 17 20.9424 1.162 1.51742 52.43 18 16.4127 0.583 19 56.7932 3.028 1.48749 70.23 20 8.2620 0.021 21 8.1912 1.196 1.78800 47.37 22 43.9783 3.875 1.49700 81.54 23 17.3897 0.081 24 77.6965 4.212 1.49700 81.54 25 15.0184 DD [25] 26 43.2833 1.986 1.49700 81.54 27 57.6954 7.164 28 27.804 1.51633 64.14 29 1.192 1.50847 61.19 30
(140) TABLE-US-00015 TABLE 15 Example 7: Data Related to Zoom Wide Angle Intermediate Telephoto Zoom Ratio 1.00 1.30 1.67 f 10.00 13.00 16.70 Bf 26.29 26.29 26.29 FNo. 2.50 2.50 2.50 2 () 48.6 38.2 30.0 DD [6] 5.724 5.401 4.531 DD [9] 12.639 4.689 1.585 DD [13] 30.119 26.939 19.126 DD [15] 0.794 8.305 15.670 DD [25] 0.475 4.417 8.839 Stop Diameter 8.768 9.180 9.644
(141) Meanwhile, A through L of
Example 8
(142)
(143) A third lens group G3 is constituted by a positive sixth lens L6 and a negative seventh lens L7, provided in this order from the magnification side. A fourth lens group G4 is constituted by a single positive eighth lens L8.
(144) A fifth lens group G5 is constituted by an aperture stop St, which is a variable stop, and five lenses, which are a negative ninth lens L9, a positive tenth lens L10, a negative eleventh lens L11, a positive twelfth lens L12, and a positive thirteenth lens L13, provided in this order from the magnification side. A sixth lens group G6 is constituted by a single positive fourteenth lens L14.
(145) Note that the fourth lens L4 and the fifth lens L5 are cemented together and the eleventh lens L11 and the twelfth lens L12 are cemented together as well.
(146) Table 16 shows basic lens data of the projection zoom lens of Example 8. In addition, Table 17 shows data related to items at the wide angle end, the intermediate position, and the telephoto end as the projection zoom lens of Example 8 changes magnification, in the same manner as Table 2.
(147) TABLE-US-00016 TABLE 16 Example 8: Basic Lens Data Ri Ndj dj Si (Radius of Di (Refractive (Abbe's (Surface Number) Curvature) (Distance) Index) Number) 1 49.0359 2.779 1.63854 55.38 2 115.0091 0.582 3 29.1697 0.884 1.71299 53.87 4 13.8954 3.946 5 25.7555 0.851 1.80518 25.42 6 26.7993 DD [6] 7 17.9988 0.897 1.62299 58.16 8 98.3079 2.461 1.73800 32.26 9 18.2535 DD [9] 10 44.0536 2.374 1.72047 34.71 11 44.0536 0.643 12 37.9866 0.788 1.60342 38.03 13 101.6000 DD [13] 14 40.6142 1.795 1.49700 81.54 15 44.7319 DD [15] 16 (aperture stop) 1.986 17 19.8048 1.144 1.51742 52.43 18 16.9153 0.589 19 90.5883 3.688 1.53715 74.81 20 8.1797 0.020 21 8.1196 1.195 1.78800 47.37 22 40.3923 3.698 1.53715 74.81 23 20.8848 0.207 24 96.4056 4.111 1.53715 74.81 25 15.2648 DD [25] 26 37.1467 1.986 1.49700 81.54 27 71.0526 7.159 28 27.802 1.51633 64.14 29 1.192 1.50847 61.19 30
(148) TABLE-US-00017 TABLE 17 Example 8: Data Related to Zoom Wide Angle Intermediate Telephoto Zoom Ratio 1.00 1.30 1.67 f 10.00 13.00 16.70 Bf 26.28 26.28 26.28 FNo. 2.50 2.50 2.50 2 () 48.6 38.2 30.0 DD [6] 6.950 6.347 4.749 DD [9] 11.715 3.713 1.588 DD [13] 31.178 28.028 19.856 DD [15] 0.794 8.957 17.554 DD [25] 0.475 4.067 7.365 Stop Diameter 8.614 8.976 9.308
(149) Meanwhile, A through L of
Example 9
(150)
(151) In Example 9, a first lens group G1 is constituted by three lenses, which are a positive first lens L1, a negative second lens L2, and a negative third lens L3, provided in this order from the magnification side. A second lens group G2 is constituted by two lenses, which are a negative fourth lens L4 and a positive fifth lens L5, provided in this order from the magnification side.
(152) A third lens group G3 is constituted by a positive sixth lens L6 and a negative seventh lens L7, provided in this order from the magnification side. A fourth lens group G4 is constituted by a single positive eighth lens L8.
(153) An aperture stop St that moves along the optical axis Z independently of the fourth lens group G4 and a fifth lens group G5 to be described later is provided between the fourth lens group G4 and the fifth lens group G5. The aperture stop St is a movable aperture stop that moves as described above such that the numerical aperture of the zoom lens is constant through the entire zoom range.
(154) Note that the aperture diameter of this aperture stop St is constant. However, the aperture stop St may be a variable stop that changes the aperture diameter thereof in order to maintain the numerical aperture of the zoom lens constant as described above. However, it is not necessary for the aperture stop to have both the functions of a moving stop and a variable stop in the present invention, and only one of the two functions may be imparted. Further, an aperture stop having neither of the two functions may be employed.
(155) A fifth lens group G5 is constituted by five lenses, which are a negative ninth lens L9, a positive tenth lens L10, a negative eleventh lens L11, a positive twelfth lens L12, and a positive thirteenth lens L13, provided in this order from the magnification side. A sixth lens group G6 is constituted by a single positive fourteenth lens L14.
(156) Note that the fourth lens L4 and the fifth lens L5 are cemented together, and the eleventh lens L11 and the twelfth lens L12 are cemented together as well.
(157) Table 18 shows basic lens data of the projection zoom lens of Example 9. In addition, Table 19 shows data related to items at the wide angle end, the intermediate position, and the telephoto end as the projection zoom lens of Example 9 changes magnification, in the same manner as Table 2.
(158) TABLE-US-00018 TABLE 18 Example 9: Basic Lens Data Ri Ndj dj Si (Radius of Di (Refractive (Abbe's (Surface Number) Curvature) (Distance) Index) Number) 1 52.0248 2.292 1.77250 49.60 2 224.4960 0.810 3 27.1867 0.884 1.72916 54.68 4 12.9092 3.868 5 24.9555 0.851 1.84666 23.78 6 33.2739 DD [6] 7 18.0197 0.871 1.61800 63.33 8 198.0251 3.273 1.62004 36.26 9 16.3825 DD [9] 10 54.5372 2.145 1.83400 37.16 11 54.5372 0.858 12 35.5941 1.986 1.51633 64.14 13 98.9794 DD [13] 14 30.3174 2.340 1.49700 81.54 15 55.7848 DD [15] 16 (aperture stop) DD [16] 17 34.6819 0.595 1.51742 52.43 18 14.9128 0.616 19 90.3520 2.725 1.48749 70.23 20 8.1243 0.277 21 7.6801 1.196 1.80400 46.57 22 28.1539 3.835 1.49700 81.54 23 19.0052 0.200 24 125.3300 4.457 1.49700 81.54 25 12.7151 DD [25] 26 31.7787 2.138 1.49700 81.54 27 70.6195 7.153 28 27.804 1.51633 64.14 29 1.192 1.50847 61.19 30
(159) TABLE-US-00019 TABLE 19 Example 9: Data Related to Zoom Wide Angle Intermediate Telephoto Zoom Ratio 1.00 1.30 1.67 f 10.00 13.00 16.70 Bf 26.28 26.28 26.28 FNo. 2.50 2.50 2.50 2 () 48.6 38.2 30.0 DD [6] 6.805 6.204 4.861 DD [9] 11.435 3.896 1.589 DD [13] 26.664 23.393 15.479 DD [15] 0.194 8.423 16.730 DD [16] 4.642 2.717 0.780 DD [25] 0.472 5.579 10.774
(160) Meanwhile, A through L of
Example 10
(161)
(162) In the projection zoom lens of Example 10, a first lens group G1 is constituted by five lenses, which are a positive first lens L1, a negative second lens L2, a negative third lens L3, a negative fourth lens L4, and a positive fifth lens L5, provided in this order from the magnification side. A second lens group G2 is constituted by two lenses, which are a positive sixth lens L6 and a negative seventh lens L7, provided in this order from the magnification side. A third lens group G3 is constituted by a single positive eighth lens L8.
(163) A fourth lens group G4 is constituted by an aperture stop St, which is a variable stop, and five lenses, which are a negative ninth lens L9, a positive tenth lens L10, a negative eleventh lens L11, a positive twelfth lens L12, and a positive thirteenth lens L13, provided in this order from the magnification side. A fifth lens group G5 is constituted by a single positive fourteenth lens L14.
(164) Note that the fourth lens L4 and the fifth lens L5 are cemented together, and the eleventh lens L11 and the twelfth lens L12 are cemented together as well.
(165) Table 20 shows basic lens data of the projection zoom lens of Example 10. In addition, Table 21 shows data related to items at the wide angle end, the intermediate position, and the telephoto end as the projection zoom lens of Example 10 changes magnification, in the same manner as Table 2.
(166) TABLE-US-00020 TABLE 20 Example 10: Basic Lens Data Ri Ndj dj Si (Radius of Di (Refractive (Abbe's (Surface Number) Curvature) (Distance) Index) Number) 1 48.5846 2.854 1.65844 50.88 2 107.8708 0.080 3 37.8639 1.588 1.63854 55.38 4 13.5679 4.139 5 22.8666 0.767 1.80518 25.42 6 28.5108 3.095 7 19.1843 1.195 1.62299 58.16 8 97.4610 3.170 1.73800 32.26 9 18.2143 DD[9] 10 31.0575 2.220 1.72047 34.71 11 82.1902 5.205 12 53.7384 0.710 1.62588 35.70 13 521.6010 DD[13] 14 26.9488 1.640 1.49700 81.54 15 66.8006 DD[15] 16 (aperture stop) 1.985 17 20.6337 1.191 1.51742 52.43 18 16.1202 0.578 19 63.9050 3.273 1.48749 70.24 20 8.0167 0.020 21 7.9511 1.195 1.77250 49.60 22 32.0361 3.187 1.49700 81.54 23 16.6166 1.182 24 86.6528 4.268 1.49700 81.54 25 14.4437 DD[25] 26 35.0914 1.985 1.49700 81.54 27 70.4236 7.152 28 27.789 1.51633 64.14 29 1.191 1.50847 61.19 30
(167) TABLE-US-00021 TABLE 21 Example 10: Data Related to Zoom Wide Angle Intermediate Telephoto Zoom Ratio 1.00 1.30 1.67 f 10.00 13.00 16.70 Bf 26.27 26.27 26.27 FNo. 2.20 2.20 2.20 2 () 48.6 38.2 30.0 DD[9] 16.052 7.368 2.912 DD[13] 20.853 18.286 10.990 DD[15] 0.794 6.798 12.056 DD[25] 0.474 5.721 12.215 Stop Diameter 8.466 8.952 9.558
(168) Meanwhile, A through L of
Example 11
(169)
(170) In the projection zoom lens of Example 11, a first lens group G1 is constituted by five lenses, which are a positive first lens L1, a negative second lens L2, a negative third lens L3, a negative fourth lens L4, and a positive fifth lens L5, provided in this order from the magnification side. A second lens group G2 is constituted by two lenses, which are a positive sixth lens L6 and a negative seventh lens L7, provided in this order from the magnification side. A third lens group G3 is constituted by a single positive eighth lens L8.
(171) A fourth lens group G4 is constituted by an aperture stop St, which is a variable stop, and five lenses, which are a negative ninth lens L9, a positive tenth lens L10, a negative eleventh lens L11, a positive twelfth lens L12, and a positive thirteenth lens L13, provided in this order from the magnification side. A fifth lens group G5 is constituted by a single positive fourteenth lens L14.
(172) Note that the fourth lens L4 and the fifth lens L5 are cemented together, and the eleventh lens L11 and the twelfth lens L12 are cemented together as well.
(173) Table 22 shows basic lens data of the projection zoom lens of Example 11. In addition, Table 23 shows data related to items at the wide angle end, the intermediate position, and the telephoto end as the projection zoom lens of Example 11 changes magnification, in the same manner as Table 2.
(174) TABLE-US-00022 TABLE 22 Example 11: Basic Lens Data Ri Ndj dj Si (Radius of Di (Refractive (Abbe's (Surface Number) Curvature) (Distance) Index) Number) 1 47.4582 2.729 1.77250 49.60 2 147.9167 0.317 3 36.5717 1.588 1.72916 54.68 4 14.3687 3.792 5 25.2759 0.767 1.80518 25.42 6 26.2960 4.634 7 19.9011 1.109 1.61800 63.33 8 28540.6466 2.552 1.69895 30.13 9 19.2799 DD[9] 10 36.0796 2.513 1.72047 34.71 11 37.6616 0.400 12 35.4435 0.710 1.85026 32.27 13 99.8243 DD[13] 14 27.0951 1.701 1.49700 81.54 15 65.9862 DD[15] 16 (aperture stop) 1.985 17 20.8458 1.191 1.51742 52.43 18 16.2859 0.617 19 125.0040 2.863 1.48749 70.24 20 8.0234 0.177 21 7.7914 1.195 1.78800 47.37 22 32.4539 3.924 1.49700 81.54 23 16.9401 0.390 24 119.5908 4.249 1.53715 74.81 25 14.1508 DD[25] 26 29.6587 2.084 1.43875 94.94 27 77.4035 7.156 28 27.792 1.51633 64.14 29 1.191 1.50847 61.19 30
(175) TABLE-US-00023 TABLE 23 Example 11: Data Related to Zoom Wide Angle Intermediate Telephoto Zoom Ratio 1.00 1.30 1.67 f 10.00 13.00 16.70 Bf 26.27 26.27 26.27 FNo. 2.50 2.50 2.50 2 () 48.6 38.2 30.0 DD[9] 15.743 6.745 1.610 DD[13] 26.866 24.704 17.991 DD[15] 0.794 6.303 11.582 DD[25] 0.475 6.126 12.694 Stop Diameter 8.528 9.078 9.716
(176) Meanwhile, A through L of
(177) TABLE-US-00024 TABLE 24 Formula Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 (1) (Rf2 Rr2)/(Rf2 + Rr2) 1.375 1.697 1.516 1.539 3.069 13.168 (2) (Rr2 Rf3)/(Rr2 + Rf3) 0.132 0.104 0.066 0.065 0.007 0.046 (3) Nd1 Nd2 0.13023 0.27058 0.22687 0.24167 1.3091 1.3091 (4) Nd2 1.48749 1.51742 1.51633 1.48749 1.49700 1.49700 (5) Zr 1.43 1.43 1.58 1.58 1.58 1.58 (6) f1/fw 1.78 1.66 1.66 1.70 1.12 1.29 (7) fe/fw 5.35 5.49 4.95 5.01 5.46 5.78 (8) f3/fw 12.15 8.88 6.63 6.64 5.33 4.13 (9) Bf/Im 2.94 2.94 2.94 2.94 2.94 2.94 (10) L/Im 9.79 9.78 9.78 9.78 9.78 7.11 Formula Example 7 Example 8 Example 9 Example 10 Example 11 (1) (Rf2 Rr2)/(Rf2 + Rr2) 1.340 1.199 1.198 1.287 1.137 (2) (Rr2 Rf3)/(Rr2 + Rf3) 0.004 0.004 0.028 0.004 0.015 (3) Nd1 Nd2 0.02993 0.01973 0.02993 0.02993 0.02993 (4) Nd2 1.48749 1.53715 1.48749 1.48749 1.48749 (5) Zr 1.67 1.67 1.67 1.67 1.67 (6) f1/fw 1.38 1.50 1.48 2.08 1.94 (7) fe/fw 5.01 4.94 4.44 4.74 4.92 (8) f3/fw 4.18 4.39 4.69 3.89 3.89 (9) Bf/Im 2.94 2.94 2.94 2.94 2.94 (10) L/Im 9.75 9.82 9.67 9.37 9.56
(178) TABLE-US-00025 TABLE 25 Condition Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 f1/fw 1.78 1.66 1.66 1.70 1.12 1.29 f2/fw 8.54 9.45 11.00 12.35 3.09 2.90 f4/fw 4.36 4.89 4.05 4.11 6.59 3.05 f5/fw 97.22 470.96 44.76 58.41 5.65 4.36 Nd1 1.61772 1.78800 1.74320 1.72916 1.80610 1.80400 Rf2 103.87170 61.90350 65.39020 63.95890 18.14620 12.63110 Rr2 16.39360 16.00450 13.41880 13.57570 9.22650 10.84800 Rf3 12.57840 12.99400 11.76780 11.90880 9.09300 9.89620 Condition Example 7 Example 8 Example 9 Example 10 Example 11 f1/fw 1.38 1.5 1.48 2.08 1.94 f2/fw 12.05 13.43 14.53 4.68 4.22 f4/fw 4.14 4.31 3.99 15.8 18.99 f5/fw 17.37 14.45 61.16 Nd1 1.51742 1.51742 1.51742 1.51742 1.51742 Rf2 56.79320 90.58830 90.35200 63.90500 125.00400 Rr2 8.26200 8.17970 8.12430 8.01670 8.02340 Rf3 8.19120 8.11960 7.68010 7.95110 7.79140
(179) Embodiments and Examples of the present invention have been described above. However, the projection zoom lens of the present invention is not limited to the Examples described above, and various modifications to the aspects of the projection zoom lens are possible. For example, the radii of curvature, the distances among surfaces, the refractive indices, and the Abbe's numbers of the lenses may be changed as appropriate.
(180) In addition, the projection type display device of the present invention is not limited to that having the configuration described above, and various modifications to the aspects of the projection type display device are possible. For example, the light valves which are employed and the optical members which are employed to separate and combine light beams are not limited to those of the configuration described above.