Abstract
A lighting module (1) for connecting to a luminaire, the lighting module extending along a longitudinal axis (LA) and comprising: a base (3) for connecting the lighting module (1) to a socket (11) of the luminaire (10); a central body (4) carrying at least a first light source (21) and a second light source (22), wherein the first light source (21) is configured to emit first light having a first light distribution with a first main direction pointing away from the longitudinal axis (LA), and the second light source (22) is configured to emit second light having a second light distribution with a second main direction pointing away from the longitudinal axis (LA), the first and second main directions being different from one another; and an optical element (6) including at least one optical portion (61) and a cover portion (62) extending all around the central body (4) and said optical element (6) being rotatable about the longitudinal axis (LA) in relation to the central body (4), the at least one optical portion (61) having an optical property, such that the optical portion (61) is configured to affect light emitted from at least one of the light sources, the at least one optical portion (61) extends in an angular area around the longitudinal axis (LA), and the cover portion (62) is configured not to affect light emitted from the remaining sources.
Claims
1. A lighting module for connecting to a luminaire, the lighting module extending along a longitudinal axis (LA) and comprising: a base for connecting the lighting module to a socket of the luminaire; a central body carrying at least a first light source and a second light source, wherein the first light source is configured to emit first light having a first light distribution with a first main direction pointing away from the longitudinal axis, and the second light source is configured to emit second light having a second light distribution with a second main direction pointing away from the longitudinal axis, the first and second main directions being different from one another; and an optical element including at least one optical portion and a cover portion extending all around the central body and said optical element being rotatable about the longitudinal axis (LA) in relation to the central body the at least one optical portion having an optical property, such that the optical portion is configured to affect light emitted from at least one of the light sources and to allow said affected light to be directly emitted from the optical element without passing through the cover portion, the at least one optical portion extends in an angular area around the longitudinal axis, and the cover portion is configured not to affect light emitted from the remaining light sources.
2. A lighting module according to claim 1, wherein the optical element comprises a plurality of optical portions each extending in different angular areas around the longitudinal axis and each having at least one optical property.
3. A lighting module according to claim 1, wherein each optical portion(s) of the optical element has at least one optical property chosen from the group of collimation, refraction, reflection, transparency, translucency, deflection, and diffraction.
4. A lighting module according to claim 1, wherein the at least one optical property of each optical portion is different from each other.
5. A lighting module according to claim 1, the cover portion is positioned adjacent to the optical portion(s) and extending in a second angular area around the longitudinal axis.
6. A lighting module according to claim 1, wherein the optical element, including the cover portion, extends all around the central body in a plane perpendicular to the longitudinal axis.
7. A lighting module according to claim 1, wherein the main directions of the light emitted from the light sources are in a plane, which is perpendicular to the longitudinal axis.
8. A lighting module according to claim 1, wherein the central body comprises a heat sink configured to transfer and dissipate heat from the light sources.
9. A lighting module according to claim 1, wherein the light sources are located at a distance from the longitudinal axis less than the maximum outer radius of the central body.
10. A lighting module according to claim 1, wherein the lighting module is configured to allow fixing the orientation of the optical element in relation to the central body.
11. A lighting module according to claim 1, comprising a number of light sources, each emitting light with a different main direction, said number being chosen from the group of 3, 4, 5 and 6.
12. A lighting module according to claim 1, wherein the optical element has a center of gravity displaced from the longitudinal axis.
13. A lighting module according to claim 1, wherein the optical portion(s) is/are configured to collimate light in a plane perpendicular to the longitudinal axis.
14. A luminaire comprising a socket and a lighting module according to claim 1, wherein the lighting module is connected to the socket.
15. A method for installing a lighting module according to claim 1 in a luminaire, comprising the steps of: providing a luminaire with a socket and a lighting module, connecting the base of the lighting module to the socket, adjusting the angular orientation of the optical element in relation to the central body to provide the desired light distribution by rotating the optical element around the longitudinal axis, and optionally fixing the orientation of the optical element in relation to the central body.
Description
BRIEF DESCRIPTION OF DRAWINGS
(1) In the following the invention will be described in more detail with reference to the drawing, where:
(2) FIG. 1a is a perspective view of a lighting module connected to a socket;
(3) FIG. 1b is a perspective view of the lighting module provided with an optical element and connected to the socket;
(4) FIG. 2a is a perspective view of the lighting module and the socket the latter being fitted in a luminaire;
(5) FIG. 2b is a schematic side view perpendicular to the longitudinal axis of a lighting module omitting the optical element;
(6) FIG. 3a is a schematic cross-sectional view of a lighting module with six light sources fitted on a round heat sink;
(7) FIG. 3b is a schematic cross-sectional view similar to FIG. 3a showing the lighting module in a reflector;
(8) FIG. 4a is a schematic cross-sectional view showing a first arrangement of a lighting module with a rotatable optical element;
(9) FIG. 4b is a schematic cross-sectional view illustrating a second arrangement of the lighting module of FIG. 4a;
(10) FIG. 4c is a schematic cross-sectional view of a lighting module with an optical element wherein the optical portion affects light from three light sources;
(11) FIG. 4d is a schematic cross-sectional view of a lighting module with an optical element wherein the optical portion affects light from three light sources;
(12) FIG. 5a is a schematic cross-sectional view similar to FIG. 4a of a lighting module wherein three optical portions each affects light from a different light source;
(13) FIG. 5b is a schematic cross-sectional view similar to FIG. 4a of a lighting module wherein two optical portions each affects light from different light sources;
(14) FIG. 6a is a schematic cross-sectional view similar to FIG. 4c of a lighting module wherein three different optical portions affect light from light sources;
(15) FIG. 6b is a schematic cross-sectional view similar to FIG. 4a of a first rotational arrangement of a lighting module including a rotatable optical element with three optical portions; and
(16) FIG. 6c is a schematic cross-sectional view similar to FIG. 6b of a second rotational arrangement of the lighting module.
DETAILED DESCRIPTION OF EMBODIMENTS
(17) FIG. 1a show a lighting module 1 for connecting to a luminaire of which only a socket 11 is shown. The lighting module 1 is here shown mounted in the socket 11. The lighting module 1 extends along a longitudinal axis LA, which extends through the center of the socket 11. The lighting module 1 comprises:
(18) a base (not shown) for connecting the lighting module to a socket 11 of the luminaire, in FIG. 1a the base not visible as it is mounted inside the socket 11;
(19) a central body 4 carrying a plurality of light sources 2 including a first light source 21 and a second light source 22. The central body 4 comprises a slender portion 41, a thick portion 42, a first connecting portion 43a and a second connecting portion 43b. The slender portion 41 has a hexagonal shape. The connecting portions 43a, 43b have a truncated cone shape. The light sources 21 and 22 are attached to respective sides of the slender portion 41 which extends along the longitudinal axis LA. Additional light sources 2 are attached to the remaining sides of the slender portion 41. The base is connected to the thick portion 42 of the central body 4. The first connecting portion 43a connects the thick portion 42 with the slender portion 41. The central body 4 further includes a heat sink 5 configured to transfer and dissipate heat from the all the light sources. The heat sink 5 is connected to slender portion 41. The heat sink 5 has cooling fins which are located at the opposite end of the lighting module 1 from the base along the longitudinal axis LA. The slender portion 41 has a smaller diameter than both the thick portion 42 and the cooling fins of the heat sink 5.
(20) The first light source 21 is configured to emit light having a first light distribution with a first main direction at an 90 angle to the longitudinal axis LA. The second light source 22 is configured to emit light having a second light distribution with a second main direction at a 90 angle to the longitudinal axis LA. The first and second main directions are different from one another. The light sources 21, 22 are each shown to be provided as two rows of ten LEDs, where the rows extend along the longitudinal axis. The LEDs of each light source have a light distribution with a main direction at an angle of 90 to the longitudinal axis LA. The main direction of the light sources 2 is coinciding with the normal of the surface of the central body 4 on which the light sources 2 are attached.
(21) FIG. 1b show lighting module 1 of FIG. 1a provided, according to the invention, with an optical element 6 rotatable about the longitudinal axis LA in relation to the central body 4. The optical element 6 includes an optical portion 61 having a deflecting property, such that the optical portion 61 is configured to deflect light emitted from at least one of the light sources 2 in a plane perpendicular to the longitudinal axis LA. The optical portion 61 extends in an angular area of about 60 around the longitudinal axis. In the present embodiment, the optical portion 61 has a constant cross section all along the longitudinal axis LA. The optical element 6 comprises a cover portion 62 adjacent to the optical portion 61. The optical element 6, including the cover portion 62, extends all around the central body 4 in a plane perpendicular to the longitudinal axis.
(22) FIG. 2a shows the lighting module 1 which is mounted in a luminaire 10 provided with the socket 11 and a reflector 12, where the longitudinal axis LA is oriented in a similar way as in FIG. 1a. The longitudinal axis LA coincides with the optical center of the reflector 12.
(23) FIG. 2b shows a schematic side view of a lighting module 1a perpendicular to the longitudinal axis LA. The lighting module 1a comprises the same elements as mentioned in relation to the lighting module 1 shown in FIG. 1 and the base 3 is shown connected to the thick portion 42 of the central body 4. In this embodiment however only four light sources 2 are indicated along the periphery of the slender portion 41 (three light sources 21, 22, 23 are visible in the figure). Each of the light sources 2 are shown to comprise one row of eight sub light sources 2 (not all marked with reference numbers), here in the form of single LEDs.
(24) FIG. 3a shows a schematic cross-section of a lighting module 1b in a plane, shown as I-I in FIG. 1a, perpendicular to the longitudinal axis LA at the slender portion 41 of the central body 4. The lighting module 1b is similar to the lighting module 1 of FIG. 1b, except that the slender portion 41a has a round cross-section instead of a hexagonal cross-section. The slender portion 41a carries six light sources 21, 22, 23, 24, 25, 26. The main direction of light for each light source is substantially perpendicular to the surface of the slender portion 41a at the place where the respective light source is attached. The optical element 6 includes the optical portion 61 and the cover portion 62, and extends all around the slender portion 41 of the central body 4. The optical portion 61 is positioned to deflect light emitted from at the first light source 21. The deflected rays of light from the first light source 21 are parallel. The cover portion 62 substantially does not affect the emission of the light from the remaining light sources 22, 23, 24, 25, 26.
(25) FIG. 3b schematically shows the lighting module 1b of FIG. 3a installed in a luminaire of which only the reflector 12 is shown. The lighting module 1b is installed such that the longitudinal axis LA coincides with the optical center of the reflector 12.
(26) FIG. 4a show a schematic cross-section of a lighting module 1c. In this embodiment, the slender portion 41 of the central body 4 has the hexagonal cross-section of the embodiment of FIGS. 1a and 1b. The optical element 6 is rotatable about the longitudinal axis in relation to the central body 4 and includes one optical portion 61. The optical element 6 is in a position where the optical portion 61 deflects light emitted from the fourth light source 24.
(27) FIG. 4b shows the same lighting module 1c as FIG. 4a, but compared to FIG. 4a the optical element 6 is rotated 120 clockwise to a position where the optical portion 61 deflects light emitted from the second light source 22 instead of the fourth light source 24.
(28) FIG. 4c shows a lighting module 1d similar to the lighting module 1b shown in FIG. 3a. In this embodiment shown in FIG. 4c however, the optical portion 61 of the optical element 6 extends in an angular area of about 150. The optical portion 61 has a deflection and a collimation property, such that the optical portion 61 is configured to deflect light emitted from two of the six light sources, e.g. the second 22, and sixth light source 26, and to collimate the light emitted from one of the six light sources, e.g. the first light source 21. In this arrangement, the deflected light of the second 22 and of the sixth light source 26 are closer to parallel in relation to the light emitted from the first light source 21 after deflection than before deflection. The light emitted from the first light source 21 is collimated such that it is substantially parallel upon exiting the optical portion 61.
(29) FIG. 4d shows a lighting module 1d similar to the lighting module 1d shown in FIG. 4c. In this embodiment shown in FIG. 4d, the optical portion 61 has a deflection and a collimation property, such that the optical portion 61 is configured to deflect light emitted from one of the six light sources, e.g. the first light source 21, and to collimate light emitted from two of the six light sources, e.g. the second 21, and the sixth light source 26. In this arrangement, the light emitted from the first light source 21 is split in two directions after being deflected by the optical portion 61, wherein one direction is more or less parallel to the collimated light from the second source 22, and another direction is more or less parallel to the collimated light from the sixth light source 26.
(30) FIG. 5a show a lighting module 1e similar to FIG. 4a. In this embodiment, the optical element 6 comprises a first 61a, a second 61b, and a third optical portion 61c. Each optical portion 61a, 61b, 61c has a deflection property such that each optical portion 61a, 61b, 61c is configured to deflect light emitted from one light source, e.g. the first 21, second 22, and third light source 26, respectively. Accordingly, the optical element 6 will deflect light from three of the six light sources.
(31) FIG. 5b show a lighting module 1f similar to FIG. 4a. In this embodiment, the optical element 6 comprises a first 61a, and a second optical portion 61b. Each optical portion 61a, 61b has a deflection property such that each optical portion 61a, 61b, 61c is configured to deflect light emitted from one light source, e.g. the first 21 and second light source 22, respectively. Accordingly, the optical element 6 in this embodiment will deflect light from two of the six light sources.
(32) FIG. 6a shows a lighting module 1g similar to FIG. 4c. In this embodiment, the optical element 6 comprises a first 61a, a second 61b, a third optical portion 61c, and a cover portion 62. Each optical portion 61a, 61b, 61c extends in an angular area of about 50. Each optical portion 61a, 61b, 61c has a deflection property such that each optical portion is configured to deflect light emitted from one light source, e.g. the first 21, second 22, and third light source 26, respectively.
(33) FIG. 6b show a schematic cross-section of a lighting module 1h similar to FIG. 4a. In this embodiment, the optical element 6 comprises a first 61a, a second 61b, a third optical portion 61c, and a cover portion 62. Each optical portion 61a, 61b, 61c extends in an angular area of about 30. The optical element 6 is in a position where the optical portions 61a, 61b, 61c are configured to deflect light emitted from the fourth light source 24 and partly deflect light emitted from the third 23 and the fifth light source 25.
(34) FIG. 6c shows the same lighting module 1h as in FIG. 6b, where the optical element 6 is rotated 120 clockwise to a position where the optical portions 61a, 61b, 61c are configured to deflect light emitted from the second light source 22 and partly deflect light emitted from the first 21 and the third light source 23.
(35) It should be understood that any of the lighting modules 1a, 1b, 1c, 1d, 1d, 1e, 1f, 1g, and 1h may be used like the module 1 in the luminaire 10 or another corresponding luminaire as shown in FIG. 2a and indicated in FIG. 3b. The latter shows the lighting module 1 is in a position in which the longitudinal axis is horizontal and the luminaire is positioned to emit light downwards. When the optical element 6 has a center of gravity displaced from the longitudinal axis LA and the optical element 6 is seated with a loose fit, gravity may rotate the optical element 6 around the longitudinal axis LA to the positions shown in FIGS. 3a and 3b to FIGS. 6a to 6c.
(36) The luminaire 10 shown in FIG. 2a may be a luminaire constructed for e.g. a High Pressure Sodium (HPS) arc lamp. The lighting modules 1 to 1h may be used for retrofitting in the luminaire 10 whereby the rotational orientation of the lighting module after mounting in the socket 11 may be unknown. The light distribution of the light sources 2 carried by the central body 4 will be different from the light distribution of the light source of the gas-discharge lamp for which the luminaire 10 is designed and accordingly the light distribution of the lighting module 1 will not match the light distribution for which the luminaire 10 is constructed. According to the present invention this mismatch is compensated by the optical element 6 that is rotatable around the longitudinal axis LA to be positioned correctly in relation to the position of the lighting module 1 in the luminaire 10. The rotation of the optical element 6 to its correct position may either be achieved through gravity as mentioned above, or it may be effected manually after mounting the lighting module 1 in the luminaire 10, and provisions may be present for fixing the optical element 6 to the central body 4 to avoid that the optical element 6 rotates unintentionally from the intended position.
LIST OF REFERENCE NUMERALS
(37) 1, 1a, 1b, 1c, 1d, 1d, 1e, 1f, 1g, 1h lighting module 2 light source 21 first light source 22 second light source 23 third light source 24 fourth light source 25 fifth light source 26 sixth light source 2 sub light source 3 base 31 end of base 4 central body 41, 41a slender portion 42 thick portion 43 connecting portion 5 heat sink 6 optical element 61 optical portion 62 cover portion LA longitudinal axis 10 luminaire 11 socket 12 reflector
