HEAD-UP DISPLAY DEVICE

Abstract

The purpose of the present invention is to provide a head-up display device capable of providing countermeasures against solar light without using a shutter or a reflective polarizer film. A case includes a first shielding part and a second shielding part that sandwich optical paths between a first mirror and a second mirror and extend to the vicinity of a cross point where the optical paths intersect. The tip end of the first shielding part is located in front of the tip end of the second shielding part. A display is arranged below the second shielding part and in front of a line that connects the tip end of the first shielding part and the tip end of the second shielding part. The first and second shielding parts block external light entering from above an opening and block external light that may enter the case and travel toward the first mirror after reflecting from the second mirror.

Claims

1. A head-up display device comprising a display that emits display light, a first mirror that reflects the display light emitted by the display, a second mirror that reflects the display light reflected by the first mirror, and a case that houses the display and the first and second mirrors, and includes an upper surface being opened, wherein: the first mirror is a concave mirror having a curvature that causes the reflected display light to vertically cross each other before reaching the second mirror; the second mirror is a mirror that reflects the received display light; the case is provided with a first shielding part and a second shielding part that extend to the vicinity of the cross point where the reflected display light is to cross each other and sandwich an optical path between the first and second mirrors; the first shielding part extends from a rear portion toward a front portion of the case, below the opening; the second shielding part extends from the front portion toward the rear portion of the case, below the opening; a tip end of the first shielding part is positioned in front of a tip end of the second shielding part; the display is arranged in front of a line that connects the tip end of the first shielding part and the tip end of the second shielding part, and below the second shielding part; and the first and second shielding parts shield external light that intrudes into the case from an outside of the case, is reflected by the second mirror, and travels toward the first mirror, and external light from above the opening.

2. The head-up display device according to claim 1, wherein the first shielding part is provided in parallel with light that is reflected at a lower end in a reflection region of the second mirror.

3. The head-up display device according to claim 1, wherein the display is provided along a line that connects the tip end of the first shielding part and the tip end of the second shielding part.

4. The head-up display device according to claim 2, wherein the display is provided along a line that connects the tip end of the first shielding part and the tip end of the second shielding part.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0036] FIG. 1 is a principle diagram of a first improved device.

[0037] FIG. 2 is a basic configuration diagram of a second improved product, in other words, a head-up display device according to the present invention.

[0038] FIG. 3 is an exploded diagram of a head-up display device according to an embodiment of the invention.

[0039] FIG. 4 is a cross-sectional diagram of the head-up display device illustrated in FIG. 3.

[0040] FIG. 5 is a diagram for explaining a shielding effect of first and second shielding parts illustrated in FIG. 4.

[0041] FIG. 6 is a diagram for explaining a further shielding effect of the first and second shielding parts illustrated in FIG. 4.

[0042] FIG. 7 is a diagram for explaining a modification example of the head-up display device illustrated in FIG. 4.

DESCRIPTION OF EMBODIMENTS

[0043] An embodiment of the present invention will be described on the basis of the attached drawings hereinafter.

Embodiment

[0044] As illustrated in FIG. 3, in a head-up display device 10, a case 20 includes a center frame 30 that supports first and second mirrors 14, 16 and is provided with a second shielding part 24, an upper cover 50 that is attached to an upper side of the center frame 30 and is provided with a first shielding part 23, and a lower cover 55 that is attached to a lower side of the center frame 30. The first shielding part 23 extends from a rear portion toward a front portion of the case 20 below an opening 20a.

[0045] The center frame 30 is an aluminum die-casting product that is provided with attachment flanges 31, 31 on an outer circumference thereof, and is provided with the second shielding part 24 that extends internally and obliquely upward. The second shielding part 24 extends from the front portion toward the rear portion of the case 20 below the opening 20a.

[0046] For example, a stay 32 is welded to the center frame 30, and the first mirror 14 is fixed to the stay 32 with an adhesion layer 33 therebetween. Moreover, the second mirror 16 is fixed to stays 34 to 36 that are welded to an inner surface of the center frame 30 respectively with adhesion layers 37 to 39.

[0047] The stay 41 is extended from a lower portion of the center frame 30. Meanwhile, a light source 11 and a display 13 are fitted into a tubular bracket 42, and a bracket piece 43 extended from the tubular bracket 42 is fixed to the stay 41 with screws 44, 44.

[0048] The center frame 30, when being an aluminum die-casting product, has a significantly higher strength and richer rigidity than a resin molding. The first and second mirrors 14, 16 and the display 13 are collectively attached to the center frame 30 that is rich in rigidity, so that adjustment of these optical axes is unlikely to be misaligned. In addition, the center frame 30 that is rich in rigidity is attached to a vehicle with the attachment flanges 31, 31. When the cover is wholly made of resin, readjustment of the optical axes may be required due to the lack of rigidity. In contrast, the head-up display device 10 in the embodiment is rich in rigidity, and thus there is little concern about the readjustment of the optical axes.

[0049] The upper cover 50 is, for example, a polycarbonate molding, and is provided with a cover glass 51 on an upper surface thereof, and is integrally provided with the first shielding part 23 that extends obliquely downward. The cover glass 51 covers the opening 20a that is formed in an upper surface of the case 20.

[0050] The lower cover 55 is a bottomed tubular body that opens upward, for example, is an ABS resin molding, and internally includes a printing board 56.

[0051] To the center frame 30, the lower cover 55 is attached with screws 57, 57 from below, and the upper cover 50 is attached with a screws 52 from above.

[0052] The head-up display device 10 illustrated in FIG. 4 is completed. At this time, a tip end 23a of the first shielding part 23 is positioned in front of a tip end 24a of the second shielding part 24. In addition, the display 13 is arranged in front of a line L2 that connects the tip end 23a of the first shielding part 23 and the tip end 24a of the second shielding part 24, and below the second shielding part 24.

[0053] Display light 12a, 12b emitted from the display 13 is reflected by the first mirror 14, and display light 15a, 15b reflected by the first mirror 14 passes between the first and second shielding parts 23, 24 and reaches the second mirror 16. Display light 17a, 17b reflected by the second mirror 16 rises and reaches a windshield 66 (projecting part 66 on which the reflected display light 17a, 17b is projected) of the vehicle.

[0054] As illustrated in FIG. 5(a), when the altitude of the sun 58 is low, external light 25, which is typified by sunlight, passes through the cover glass 51, is reflected by the second mirror 16, and is shielded by the first shielding part 23. The first shielding part 23 includes polycarbonate excellent in heat resistance, and thus has a high strength against heat.

[0055] When the altitude of the sun 58 is high, as illustrated in FIG. 5(b), the external light 25 passes through the cover glass 51, is reflected by the second mirror 16, and is shielded by the second shielding part 24. The second shielding part 24 includes aluminum further excellent in heat resistance, and thus has a higher strength against heat.

[0056] FIG. 6 is referred. The tip end 23a of the first shielding part 23 that extends forward from the rear portion is positioned in front of the tip end 24a of the second shielding part 24 that extends rearward from the front portion. Accordingly, the first shielding part 23 and the second shielding part 24 are partially and vertically overlapped. With this, the external light 25 from above, while passing through the opening 20a, is interrupted by the first and second shielding parts 23, 24, and does not reach below the first and second shielding parts 23, 24. In other words, the first and second shielding parts 23, 24 shield the external light 25 from above the opening 20a. The large opening 20a is secured to allow the display 13 to be protected against the external light while allowing a large video to be displayed.

[0057] The display 13 is arranged on the front side (inner side) from the line L2 that connects the tip end 23a of the first shielding part 23 and the tip end 24a of the second shielding part 24. This can prevent the external light from intruding from between the first and second shielding parts 23, 24, and prevent the external light from directly striking the display 13.

[0058] FIG. 4 is referred. The first shielding part 23 is provided in parallel with the display light 17b that is reflected at a lower end in a reflection region of the second mirror 16. Because the first shielding part 23 is provided in parallel with the display light 17b, it is possible to prevent the first shielding part 23 from interrupting the display light 17b that is reflected. This can provide the larger opening 20a, and project a large image.

[0059] FIG. 7 is referred. In FIG. 7, a head-up display device 10A according to a modification example is illustrated. In the head-up display device 10A, a display 13A is provided along the line L2 that connects the tip end 23a of the first shielding part 23 and the tip end 24a of the second shielding part 24. The other basic configurations are common to those of the head-up display device 10 according to the first embodiment. As for parts common to those of the first embodiment, the reference numerals are also used, and the detailed explanations are omitted.

[0060] Also in the head-up display device 10A that is configured in this manner, the predetermined effect by the invention can be obtained.

[0061] In addition, the display 13A can be arranged so as to be proximate to the line L2. The display 13A is arranged so as to be proximate to the line L2 to make it possible to prevent the generation of a dead space, and to downsize the head-up display device 10A.

[0062] The head-up display device of the invention is suitable for passenger vehicles, and is allowable to be applied to general vehicles, ships, and aircraft. In other words, the present invention is not limited to the embodiment as long as the actions and effects of the invention are exhibited.

INDUSTRIAL APPLICABILITY

[0063] The head-up display device of the is suitable for a vehicle provided with a windshield.

REFERENCE SIGNS LIST

[0064] 10, 10A . . . Head-up display device [0065] 13, 13A . . . Display [0066] 14 . . . First mirror [0067] 16 . . . Second mirror [0068] 20 . . . Case [0069] 20a . . . Opening [0070] 21 . . . Optical path [0071] 22 . . . Cross point [0072] 23 . . . First shielding part [0073] 23a . . . Tip end (of first shielding part) [0074] 24 . . . Second shielding part [0075] 24a . . . Tip end (of second shielding part) [0076] L2 . . . Line that connects tip end of first shielding part and tip end of second shielding part