TWI418741B - Lighting device - Google Patents

Description

Lighting device

The present invention relates to lighting devices, and more particularly to a lighting device that produces an up and down asymmetrical light pattern.

The lamps used in the car are mostly incandescent lamps, halogen lamps and High Intensity Discharge (HID) as the main source of illumination, but with the increasing attention to environmental protection and energy conservation, due to the LED (Light-Emitting Diode; referred to as LED) has the advantages of small size, low power consumption, fast response time and long service life. Therefore, automobile manufacturers in various countries have gradually adopted LED as the light source of automobile lamps. LED is used in automotive lighting fixtures, and can be used as an in-vehicle dashboard display, or as a vehicle exterior light, direction light, reverse light, third brake light, rear fog light, etc., however, the front fog light using LED is less common. .

At present, the two mainstreams of the lamp design are the Poly-Ellipsoid System (also known as the Projection System) and the Multi-Reflector (MR). For example, the "front fog lamp / A fog lamp" disclosed in the Chinese Patent Publication No. I296585 is a projection type lamp using an LED as a light source. To match the unique radiation type of the LED, the front fog lamp uses a projection lens. Combining a mirror with a light shield to block part of the light, so that the front fog lamp can generate an up and down asymmetrical light pattern to adjust to meet the requirements of the Economic Commission for Europe (ECE) for vehicle lighting equipment. Develop the light type of the previous fog lamp specification (ECE R19) (as shown in the first figure).

The first figure shows the fog light type before the ECE R19 specification. The center of the light beam of the front fog lamp is centered, and the parallel axis h is formed to the left and right, and the vertical axis v is formed upward and downward. The light type mainly has five regions: the A region is located below the light-emitting axis and extends to the left and right by a distance, which is the region with the highest brightness; the B region extends outward from the A region to the left and the right, respectively, and the brightness is lower than Area A; Section C is located above the illuminating axis, extending to the left and right, about half the distance of the A area, and the brightness is lower than the B area; the D area extends upwards, downwards, left, and right from the A area, respectively. The brightness is lower than the C area; the E area extends from the D area to the upper side, and the brightness is lower than the D area.

Before the aforementioned patents, the fog lamps can achieve the light type of the ECE R19 specification. However, the optical lens focusing method is used to achieve the projection light pattern of the desired radiation field, and therefore the projection lens position is required to be quite accurate; The visor will reduce the utilization of light. Therefore, if the front fog lamp emits sufficient brightness, it is necessary to set a plurality of LEDs at the position of the light source, which not only causes energy waste but also has the disadvantage of heat dissipation. .

In addition, the "LED planar light source and profile headlight constructed therewith" disclosed in US Pat. No. 6,946,672 B2 is a reflective type of light that constitutes a planar light source with LEDs, and the LED planar light source is placed at the focus of a parabolic reflector. To produce a radiant light field of parallel projected illumination. However, the reflector of the reflective lamp must be large in size in order to effectively converge the LED light source that is directed toward the periphery to project sufficient light intensity, and thus still needs to be improved.

In view of the above-mentioned deficiencies, the main object of the present invention is to provide a lighting device which can not only generate an up and down asymmetrical light type to comply with the ECE R19 specification, but also has the advantages of power saving and good light utilization.

In order to achieve the above object, the illumination device provided by the present invention comprises a reflector and a light-emitting component. The inner surface of the reflector has an upper curved surface, a lower curved surface, and a two-sided plane connected between the upper and lower curved surfaces, and the light-emitting element is disposed on the curved cover and the lower curved focus on the reflective cover. between. Thereby, the light generated by the illuminating element is reflected by the reflector and the lower curved surface, and the light is projected outward, and the light projected by the illuminating device is accompanied by the difference in the curvature design of the upper and lower surfaces. The height is different and has different brightness, so that the light pattern of the vehicle lighting device meeting the specific specification can be adjusted, and since the specific light type effect is not achieved by blocking part of the light generated by the light emitting element, the lighting device has good performance. Light utilization. Furthermore, the illumination device can be further provided with a lens with different curvatures up and down to increase the light collection efficiency of the light reflected by the reflector to further improve the light utilization efficiency of the illumination device.

Detailed construction, features, assembly or use of the illumination device provided by the present invention will be described in the detailed description of the following embodiments. However, it should be understood by those of ordinary skill in the art that the present invention is not limited by the scope of the invention.

The technical content and features of the present invention will be described in detail below with reference to the accompanying drawings, wherein: FIG. 2 is a perspective view of a lighting device according to a first preferred embodiment of the present invention; 3 is a schematic side view of a lighting device provided by the first preferred embodiment of the present invention; FIG. 4 is a top plan view of the lighting device provided by the first preferred embodiment of the present invention; A schematic diagram of a light pattern of a lighting device provided by the first preferred embodiment of the present invention; a sixth schematic view of a lighting device according to a second preferred embodiment of the present invention; and a seventh diagram of the present invention A side view of a lighting device provided by a third preferred embodiment.

The Applicant first describes the same or similar elements or structural features thereof in the embodiments and the drawings which will be described below.

Referring to the second to fourth figures, a lighting device 10 according to a first preferred embodiment of the present invention includes a reflector 20 and a light-emitting element 30.

The reflector 20 is in the form of an open casing having an inner surface 22, a lower curved surface 24, and two side planes 26 connected between the upper and lower curved surfaces 22, 24. The connection between the upper and lower curved surfaces 22 and 24 forms a connecting portion 27 of the reflecting cover 20, and the opening portion 28 of the reflecting cover 20 is formed with respect to the connecting portion 27. The radius of curvature of the upper curved surface 22 is smaller than the radius of curvature of the lower curved surface 24, and therefore, the focus 222 of the upper curved surface 22 is closer to the connecting portion 27 than the focal point 242 of the lower curved surface 24, and the two focal points 222 The connection of 242 defines an illumination axis 40 of the illumination device 10. Each of the side planes 26 is inclined outwardly from the connecting portion 27 toward the opening 28 such that the cross-sectional width of the reflecting cover 20 perpendicular to the light-emitting axis 40 thereof gradually widens from the connecting portion 27 toward the opening 28; The two side planes 26 are provided with an outwardly inclined angle centered on the light-emitting element and symmetrical to the opening 28, preferably at an angle of less than 10 degrees and greater than 5 degrees (of which 8 degrees is optimal) There is a viewing angle that meets specific lighting specifications when applied to a vehicle device.

The light-emitting element 30 is a light-emitting diode disposed between the curved surface focus 222 and the lower curved surface focus 242 of the reflective cover 20 such that light generated by the light-emitting element 30 passes through the reflective cover 20 and the lower curved surface 22 . After being reflected by the 24 and the two side planes 26, light rays diverging around the light-emitting axis 40 are projected toward the opening 28, and the diverging direction corresponds to the symmetrical brightness of the left and right sides of the light-emitting axis 40. The distribution corresponds to an asymmetrical luminance distribution above and below the illumination axis 40 and a larger luminance distribution on the lower side to conform to the specific specification of the vehicle lighting device.

The illumination device 10 provided in the foregoing embodiment can be used to be disposed at the front end of the front of the automobile as the front fog lamp of the automobile. Due to the difference in curvature design of the upper and lower curved surfaces 22, 24, the illumination device 10 projects the light It will have different brightness depending on its projection height, and since the two side planes 26 are inclined outward, the angle of light can be projected toward the left and right sides; therefore, the light projected by the illumination device 10 A projection plane 42 perpendicular to the axis of illumination 40 in front of the opening 28 produces a pattern of light as shown in the fifth embodiment, which is located above the axis of illumination 40 and has an asymmetric brightness distribution on the lower side. In detail, the brightness distribution of the illuminating device 10 on the projection plane 42 is gradually decreased from the central region 422 having a small vertical length and a large horizontal length toward the upper, lower, left and right colors, and the generated light pattern is generated. It is in compliance with the requirements of ECE R19. In addition, since the specific light type effect is not achieved by blocking a part of the light generated by the light-emitting element 30, the illumination device 10 has a good light utilization efficiency. Moreover, since the light-emitting element 30 is a light-emitting diode, the lighting device 10 can further have the advantages of energy saving and power saving.

Referring to the sixth embodiment, a lighting device 50 according to a second preferred embodiment of the present invention combines three sets of the reflector 20 and the light-emitting element 30 in the first preferred embodiment. In detail, each of the reflectors 20 has a side plane 26 adjacent to one side plane 26 of the other reflector cover 20, and the openings 28 of the reflectors 20 are oriented in the same direction and on the same opening plane 60. In addition, the upper and lower curved surface focus lines of the reflectors 20 are parallel to each other and are in the same plane. The light emitted by the illuminating device 50 is also diverged around the center of the light-emitting axis 40. The light-emitting axis 40 is parallel to the top surface of each of the reflectors 20 and is in the same plane, and is perpendicular to The opening plane 60, in this embodiment, the light-emitting axis 40 is above the reflective cover 20 in the middle, and the lower curved surface is connected. The light-emitting elements 30 disposed inside the reflectors 20 are arranged in a line 62 parallel to the plane of the opening 60, that is, the line 62 is perpendicular to the axis of illumination 40. Thereby, the light projected by the illumination device 50 can also form the light type as shown in FIG. 5, which not only conforms to the specification of ECE R19, but also has the advantages of power saving and good light utilization. In addition, since the illuminating device 50 has three illuminating elements 30 arranged in a distributed manner, it not only has a large brightness, but also has better heat dissipation properties than a general illuminating device of the same brightness.

It can be seen from the foregoing two embodiments that the illumination device provided by the present invention can combine multiple sets of reflectors 20 and light-emitting elements 30 according to the required brightness, so that the light projected by the illumination device can have sufficient light. Brightness, and can form an optical type that conforms to the ECE R19 specification, and has the advantages of energy saving and good heat dissipation. In addition, in the illumination device provided in the foregoing two embodiments, a lens 70 (shown in FIG. 7) may be disposed in each of the reflectors 20 at a position closer to the opening 28, and the lens 70 has a direction toward the The first curved surface 71 and the second curved surface 72 of the opening 28 are respectively adjacent to the upper surface and the lower curved surface of the reflector 20, and have different curvature distributions in accordance with the radiation field generated by the reflector 20, and the present embodiment has different curvature distributions. For example, the first curved surface 71 has a shape of irregular curvature, and the radius of curvature of the second curved surface 72 is larger than the radius of curvature of the first curved surface 71; thereby, the lens 70 can be self-reflecting The light emitted by the opening 20 of the cover 20 converges and is projected again, so that the light utilization efficiency of the lighting device can be further improved.

Finally, it is to be noted that the constituent elements disclosed in the foregoing embodiments are merely illustrative and are not intended to limit the scope of the present invention, and alternative or variations of other equivalent elements should also be the scope of the patent application of the present application. Covered.

10. . . Lighting device

20. . . Reflector

twenty two. . . Upper surface

222. . . focus

twenty four. . . Lower surface

242. . . focus

26. . . Side plane

27. . . Connection

28. . . Opening

30. . . Light-emitting element

40. . . Luminous axis

42. . . Projection plane

422. . . Central area

50. . . Lighting device

60. . . Opening plane

62. . . straight line

70. . . lens

71. . . First surface

72. . . Second surface

The first picture is a schematic diagram of the fog light pattern before the ECE R19 specification;

2 is a perspective view of a lighting device according to a first preferred embodiment of the present invention;

Figure 3 is a side elevational view of the lighting device provided by the first preferred embodiment of the present invention;

Figure 4 is a top plan view of a lighting device provided by the first preferred embodiment of the present invention;

Figure 5 is a schematic view showing the light pattern of the illumination device provided by the first preferred embodiment of the present invention;

Figure 6 is a top plan view of a lighting device provided by a second preferred embodiment of the present invention;

Figure 7 is a side elevational view of a lighting device provided by a third preferred embodiment of the present invention.

10. . . Lighting device

20. . . Reflector

28. . . Opening

30. . . Light-emitting element

Claims (14)

An illumination device includes: a reflector having an upper curved surface, a lower curved surface and two side planes, wherein the upper curved surface is different from the curvature of the lower curved surface, and the two lateral planes are located on the upper and lower surfaces And facing, the upper curved surface, the lower curved surface and the two side planes are formed with a rectangular opening, the rectangular opening is located at the front end of the reflector; and a light-emitting element is disposed in the reflector And opening the rectangle. The illuminating device of claim 1, wherein a connecting portion is formed between the upper and lower curved surfaces of the reflector, the connecting portion is fastened to the rear end of the reflector; the two sides are connected from the connecting The portion is inclined outward toward the rectangular opening such that the cross-sectional width of the reflector perpendicular to its axis of illumination is gradually widened from the connecting portion toward the rectangular opening. The illuminating device of claim 2, wherein the two side planes have an outwardly inclined angle that is symmetrical with each other toward the rectangular opening direction. The illuminating device of claim 3, wherein the two side planes are inclined outwardly at an angle of less than 10 degrees and greater than 5 degrees toward the rectangular opening direction. The illumination device of claim 1, wherein the reflector further has a lens between the light-emitting element and a rectangular opening of the reflector, the lens having a first curved surface facing the rectangular opening of the reflector And a second curved surface adjacent to the upper and lower curved surfaces of the reflector. The illuminating device of claim 5, wherein the second curved surface has a radius of curvature greater than a radius of curvature of the first curved surface. The illuminating device of claim 5, wherein the first curved surface has a shape of irregular curvature. A lighting device includes: a plurality of reflectors, each of the inner masks of the reflector has an upper curved surface, a lower curved surface and two side planes, the upper curved surface is different from the curvature of the lower curved surface, and the two lateral planes are located in the Between the upper and lower surfaces, and facing each other, the upper curved surface, the lower curved surface and the front side of the two side planes are formed with a rectangular opening, the rectangular opening is fastened to the front end of the reflector, and the reflective cover is The side planes of the adjacent reflectors are adjacent to each other; and a plurality of light-emitting elements are respectively disposed in the reflector and are open to the rectangular of the reflectors. The illuminating device of claim 8, wherein a connecting portion is formed between the upper and lower curved surfaces of each of the reflecting covers, the connecting portion being tied at the rear end of the reflecting cover; and two sides of each reflecting cover The plane is inclined outward from the connecting portion toward the rectangular opening such that the cross-sectional width of each of the reflecting covers perpendicular to the axis of illumination thereof is gradually widened from the connecting portion toward the rectangular opening. The illuminating device of claim 9, wherein the two side planes of each of the reflectors have an outwardly inclined angle that is symmetrical with each other toward the rectangular opening direction. The illuminating device of claim 10, wherein the two side planes of each of the reflectors are inclined outwardly at an angle of less than 10 degrees and greater than 5 degrees toward the rectangular opening. The illuminating device of claim 9, wherein each of the reflectors further has a lens between the light-emitting element and a rectangular opening of the reflector, the lens having one of rectangular openings facing the reflector The curved surface and the second curved surface are respectively adjacent to the upper surface and the lower curved surface of the reflective cover. The illuminating device of claim 12, wherein a radius of curvature of the second curved surface of each lens is larger than a radius of curvature of the first curved surface. The illumination device of claim 12, wherein the first curved surface of each lens is in the shape of an irregular curvature.