PROJECTION UNIT FOR LOW BEAM LIGHT OF VEHICLE AND VEHICLE LAMP USING SAME

Abstract

Disclosed are a projection unit for a low beam light of a vehicle, and a vehicle lamp. The projection unit is composed of a light source, a reflection plate and an optical lens. Wherein the reflection plate is provided with a reflection boundary corresponding to the shape of a bright and dark cut-off line required by an illumination light shape of a vehicle lamp system, and the reflection plate is a plane reflector, a curved reflector, or a reflector formed by connecting multiple curved surfaces. The reflection boundary is arranged near a focus of the optical lens, the light source illuminates the reflection plate, and light rays reflected by the reflection plate form an initial illumination light shape.

Claims

1. A projection unit for a low beam light of a vehicle, comprising a light source and an optical lens in an emergent direction of a low beam light, wherein: a reflection plate is arranged in the direction of an optical axis of the light source, and light rays reflected by the reflection plate illuminate a road surface through the optical lens; the reflection plate is provided with a reflection boundary corresponding to a shape of a bright and dark cut-off line required by an illumination light shape of a vehicle lamp system to replace a light shield plate and a boundary of the light shield plate, and the reflection boundary of the reflection plate is arranged at or near a focus of the optical lens; the light source illuminates the reflection plate, the light rays reflected by the reflection plate form an initial illumination light shape and then illuminate the road surface through the optical lens to form a final secondary light shape with a bright and dark cut-off line.

2. The projection unit for a low beam light of a vehicle according to claim 1, wherein: the light source is preferably a surface light source, and is further preferably an LED.

3. The projection unit for a low beam light of a vehicle according to claim 1, wherein: a reflection surface of the reflection plate is arc, and the reflection boundary of the reflection plate is located at an upper end of the reflection plate.

4. The projection unit for a low beam light of a vehicle according to claim 1, wherein: a reflection surface of the reflection plate is arc, and the reflection boundary of the reflection plate is located at a lower end of the reflection plate.

5. The projection unit for a low beam light of a vehicle according to claim 1, wherein: the reflection boundary of the reflection plate is arranged 0-5 mm away from a focus of the lens.

6. The projection unit for a low beam light of a vehicle according to claim 1, wherein: light rays reflected by the reflection boundary of the reflection plate enter an incident plane of the lens approximately horizontally.

7. The projection unit for a low beam light of a vehicle according to claim 1, wherein: the reflection plate has a reflectivity not less than 80%.

8. The projection unit for a low beam light of a vehicle according to claim 1, wherein: a secondary light distribution member is additionally arranged between the light source and the reflection plate to converge the light rays or change a light energy distribution to improve luminous efficacy.

9. The projection unit for a low beam light of a vehicle according to claim 1, wherein: the reflection plate is a plane reflector, a curved reflector, or a reflector formed by connecting multiple curved surfaces.

10. The projection unit for a low beam light of a vehicle according to claim 8, wherein: the secondary light distribution member arranged between the light source and the reflection plate is a convex lens, a transparent photoconductor, or a reflector.

11. A vehicle lamp, using the projection unit for a low beam light of a vehicle according to claim 1.

Description

BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS

[0043] FIG. 1 is a structural diagram of a traditional projection unit for a vehicle lamp;

[0044] FIG. 2 is a light-emitting diagram of the traditional projection unit for a vehicle lamp;

[0045] FIG. 3A is a schematic diagram of the light path of a projection unit for a low beam light of a vehicle according to the invention;

[0046] FIG. 3B is a front view of one side of a lens of the projection unit for a low beam light of a vehicle according to the invention;

[0047] FIG. 4 is a schematic diagram of a low beam path of the projection unit for a low beam light of a vehicle according to the invention;

[0048] FIG. 5 is a schematic diagram of a dipped-beam illumination path of the projection unit for a low beam light of a vehicle according to the invention;

[0049] FIG. 6A is a schematic diagram of the set state of a reflection plate of the projection unit for a low beam light of a vehicle according to the invention;

[0050] FIG. 6B is a left view of the reflection plate, shown in FIG. 6A, of the projection unit for a low beam light of a vehicle according to the invention;

[0051] FIG. 6C is a top view of a reflection surface of the reflection plate, shown in FIG. 6A, of the projection unit for a low beam light of a vehicle according to the invention;

[0052] FIG. 7A is a schematic diagram of the projection unit for a low beam light of a vehicle with a secondary light distribution member additionally arranged between a light source and a reflection plate according to the invention;

[0053] FIG. 7B is a front view of one side of a lens of the projection unit for a low beam light of a vehicle shown in FIG. 7A;

[0054] FIG. 7C is a left view of the projection unit for a low beam light of a vehicle shown in FIG. 7B;

[0055] FIG. 8 is a schematic diagram of a light path of the projection unit for a low beam light of a vehicle with the secondary light distribution member additionally arranged between the light source and the reflection plate, shown in FIG. 7A;

[0056] FIG. 9A is another schematic diagram of the projection unit for a low beam light of a vehicle with the secondary light distribution member additionally arranged between the light source and the reflection plate according to the invention;

[0057] FIG. 9B is a front view of one side of a lens of the projection unit for a low beam light of a vehicle, shown in FIG. 9A;

[0058] FIG. 9C is a left view of the projection unit for a low beam light of a vehicle, shown in FIG. 9B;

[0059] FIG. 10 is the schematic diagram of another light path of the projection unit for a low beam light of a vehicle with the secondary light distribution member additionally arranged between the light source and the reflection plate, shown in FIG. 9A;

[0060] FIG. 11 is a schematic diagram of a reflection boundary at a lower end of the reflection plate;

[0061] FIG. 12 is the schematic diagram of the light path in case where the reflection boundary is located at the lower end of the reflection plate;

[0062] FIG. 13A is the front view of the reflection boundary at the lower end of the reflection plate.

[0063] FIG. 13B is the left view of the reflection boundary at the lower end of the reflection plate.

[0064] FIG. 13C is the top view of the reflection boundary at the lower end of the reflection plate.

[0065] In the figures: 1, LED light-emitting chip circuit board; 2, reflector; 3, light shield plate; 3a, cut-off line of light shield plate; 4, optical lens; 5, reflection plate; 5a, bright and dark cut-off line of reflection boundary of reflection plate; 6, secondary light distribution lens;

[0066] The reflection boundary of the reflection plate corresponds to the shape of a bright and dark cut-off line required by an illumination light shape of a vehicle lamp system.

DETAILED DESCRIPTION OF THE INVENTION

[0067] The invention will be explained in further detail below in conjunction with the accompanying drawings and specific embodiments.

Embodiment 1

[0068] A projection unit for a low beam light of a vehicle comprises a light source and an optical lens, and is provided with a reflection plate, wherein an upper boundary of the reflection plate is provided with a boundary corresponding to the shape of a bright and dark cut-off line required by an illumination light shape of a vehicle lamp system to replace a light shield plate and a boundary of the light shield plate, and the reflection boundary of the reflection plate is arranged near a focus of the optical lens. The light source is an LED surface light source. The light source illuminates the reflection plate, and light rays reflected by the reflection plate form an initial illumination light shape and then illuminate a road surface through the optical lens to form a final illumination light shape with a bright and dark cut-off line.

[0069] An optical axis of the light source of the projection unit deviates from the normal of the reflection plate by 45°, the reflection plate is arranged below the light source at an angle of 45°, a reflection surface of the reflection plate is arc, and the material surface of the reflection plate is coated with aluminum to realize a reflectivity not less than 50%. The reflection boundary of the reflection plate is located at the upper end of the reflection plate, and the optical axis of the light source of the projection unit is parallel to the normal of the reflection plate. The light rays reflected by the reflection plate illuminate the road surface in parallel with an optical axis of the optical lens.

[0070] According to the light-emitting characteristic of the light source, the curvature of the reflection surface is set to control the light intensity distribution of a secondary illumination light shape to make the secondary light illumination shape close to an inflection point of the bright and dark cut-off line, such that the light intensity of the secondary illumination light shape is increased.

[0071] According to this embodiment, the light source illuminates the reflection plate, and the light rays reflected by the reflection plate form the initial illumination light shape and then illuminate the road surface through the optical lens to form the final illumination light shape with the bright and dark cut-off line.

Embodiment 2

[0072] This embodiment is identical with Embodiment 1 except in the following aspect:

[0073] A secondary light distribution member is additionally arranged between the light source and the reflection plate. The secondary light distribution member is a convex lens or a reflector, and is used for converging the light rays or changing the light energy distribution to improve the luminous efficacy.

Embodiment 3

[0074] This embodiment is identical with Embodiment 1 except in the following aspect:

[0075] The reflection boundary of the reflection plate is arranged 0-5 mm away from the focus of the lens.

Embodiment 4

[0076] This embodiment is identical with Embodiment 1 except in the following aspect:

[0077] The reflection boundary of the reflection plate is located at the lower end of the reflection plate, as shown in FIG. 11, FIG. 12 and FIG. 13.

[0078] According to the invention, the specific structure, connection and arrangement of the light source, the reflection plate and the optical lens of the projection unit can replace a reflector and a light shield which are indispensable in the prior art, such that the vehicle lamp has the functions of low beam lights and fog lamps, the size and space of the vehicle lamp are greatly reduced, and a flat design of the vehicle lamp is realized. In addition, the specific structure, connection and arrangement of the light source, the reflection plate and the optical lens of the projection unit can replace the reflector and the light shield which are indispensable in the prior art, and the fluctuation in product performance caused by manufacturing errors of parts and the assembly of units is reduced.