Low-beam projection type optical system and vehicle lamp

Abstract

The utility model relates to a low beam projection type optical system and a car lamp, the optical system comprises a primary lens, a secondary lens, a reflector and a plurality of LED light sources arranged in a line, the reflector comprises a plurality of reflecting surfaces in one-to-one correspondence with the LED light sources, and the primary lens comprises a plurality of lens units which are connected and in one-to-one correspondence with the reflecting surfaces; the reflector is arranged above the LED light source, the primary lens is arranged in front of the reflector, and the secondary lens is arranged in front of the primary lens; any lens unit is a cylindrical convex lens with a longitudinal cylinder, and the secondary lens is a cylindrical convex lens with a transverse cylinder; the edge of the rear end of any reflecting surface is set to be in a cut-off line shape; light emitted by the LED light source is reflected into a light beam with a cut-off line through the reflecting surface, and the light beam forms a passing light type after passing through the primary lens and the secondary lens; according to the utility model, the volume is smaller, the weight is smaller, the occupied installation space is reduced, and the manufacturing cost is lower; the vehicle lamp is provided with the optical system and has the same technical effect.

Description

Technical Field

[0001] The utility model relates to the technical field of automobile parts, in particular to a low-beam projection optical system and a vehicle lamp. Background Art

[0002] The main structure of the existing low-beam headlight module includes a light source, a reflector, a sunshade and a lens. The sunshade is used to form a light-dark cutoff line. The light source is a single light source, and the lens adopts a single circular convex lens structure to converge light. It has large lateral and longitudinal dimensions and a large thickness, resulting in a large volume and heavy weight. The installation of the sunshade also occupies part of the volume, further increasing the volume and weight of the low-beam headlight module, resulting in a large volume, heavy weight and high manufacturing cost. In addition, the brightness of the light projected onto the ground by the existing low-beam headlight module is also insufficient. Compact and flat is the general trend of the development of headlights. The installation space for imaging modules in headlights is getting smaller and smaller. The existing low-beam headlight module structure is difficult to meet the requirements. Utility Model Content

[0003] The first purpose of the present invention is to provide a low-beam projection optical system to address the problems in the prior art that the low-beam headlight module is large in size, heavy in weight, occupies a large installation space and has high manufacturing costs; the second purpose of the present invention is to provide a headlight.

[0004] In order to achieve the above first purpose, the technical solution adopted by the present utility model is:

[0005] A low-beam projection optical system comprises a primary lens, a secondary lens, a reflector and a plurality of LED light sources arranged in a line, the reflector comprising a plurality of reflective surfaces corresponding one-to-one to the LED light sources, the primary lens comprising a plurality of lens units connected and corresponding one-to-one to the reflective surfaces; the reflector is arranged above the LED light source, the primary lens is arranged in front of the reflector, and the secondary lens is arranged in front of the primary lens; any of the lens units is a cylindrical convex lens with a column along the longitudinal direction, and the secondary lens is a cylindrical convex lens with a column along the transverse direction; the rear end edge of any of the reflective surfaces is arranged in a cutoff line shape; the light emitted by the LED light source is reflected by the reflective surface into a light beam with a cutoff line, and the light beam forms a low-beam light pattern after passing through the primary lens and the secondary lens.

[0006] In the utility model adopting the above-mentioned technical solution, the light emitted by any LED light source is reflected by the corresponding reflecting surface and then enters the corresponding lens unit. The light is converged in the horizontal direction by the lens unit and then enters the secondary lens. The light is converged in the vertical direction by the secondary lens to form a part of the low beam light pattern. The partial low beam light patterns formed by multiple LED light sources are combined to form a low beam light pattern that meets the requirements. Compared with the prior art that adopts a single light source and realizes the focusing function through a circular convex lens to form a low beam light pattern, the utility model adopts a dual lens structure of a primary lens and a secondary lens, which can achieve the same focusing function as a single convex lens. At the same time, each LED light source in the utility model only forms a part of the low beam light pattern, so the horizontal and vertical dimensions and thickness of the lens unit can be set to be smaller. The volume is small, and multiple lens units are connected to form a strip-shaped primary lens. At the same time, the secondary lens is also set as a strip-shaped cylindrical convex lens to cooperate with the primary lens. The longitudinal size and thickness of both are much smaller than the existing circular convex lens. Both occupy less space, weigh less, use less lens material, and have lower cost. In addition, the sunshade is eliminated, and a cutoff line shape is set at the rear end edge of the reflective surface. The light emitted by the LED light source can be reflected by the reflective surface to form a light beam with a cutoff line, which also reduces the installation volume and weight and reduces the cost. Compared with the existing technology, the low beam headlight module is large in volume, heavy in weight, occupies a large installation space and has high manufacturing cost. The utility model has a smaller volume, lighter weight, reduces the installation space occupied, and has lower manufacturing cost.

[0007] Furthermore, any of the reflecting surfaces is an ellipsoidal surface, which includes two foci, one at the front and the other at the back; any of the LED light sources is arranged at the back focus of the corresponding reflecting surface, and the light emitted by the LED light source is reflected by the reflecting surface and then converges into the corresponding lens unit; with such an arrangement, the light converges into the lens unit, avoiding light loss, so that the brightness of the light finally projected onto the ground is higher.

[0008] Furthermore, the rear end edge of any of the reflecting surfaces is arranged on or near the focal line of the secondary lens; with such an arrangement, the formed low beam light pattern has a clear bright and dark cut-off line.

[0009] Furthermore, any of the lens units includes a first light-incoming surface and a first light-outgoing surface, the first light-incoming surface is a plane, and the first light-outgoing surface is a convex cylindrical surface; or the first light-incoming surface is a convex cylindrical surface, and the first light-outgoing surface is a plane; the secondary lens includes a second light-incoming surface and a second light-outgoing surface, the second light-incoming surface is a plane, and the second light-outgoing surface is a convex cylindrical surface.

[0010] Furthermore, the lateral size of the secondary lens ranges from 30 mm to 100 mm, and the longitudinal size of the secondary lens ranges from 10 mm to 30 mm. As the final light-emitting lens, the secondary lens occupies relatively small space in both the lateral and longitudinal directions.

[0011] Furthermore, it also includes a PCB board, and the LED light sources are all arranged on the top surface of the PCB board, the light-emitting center axes of the LED light sources are all perpendicular to the PCB board, and the PCB board is tilted with its top surface facing the rear and upper direction; such a setting can reduce the light from the LED light source that directly enters the lens unit without being reflected by the reflective surface, so that most of the light emitted by the LED light source is first reflected by the reflective surface before entering the lens unit, thereby reducing stray light in the low beam III zone and improving the low beam light type effect.

[0012] Furthermore, the angle between the PCB board and the optical axis of the low beam pattern is 10° to 15°; with this arrangement, the low beam pattern can be formed with better effect.

[0013] Furthermore, it also includes a radiator, and the PCB board is installed on the radiator; the radiator dissipates heat for the PCB board to prevent the PCB board from overheating and affecting the lighting effect of the LED lamp.

[0014] To achieve the second purpose, the present invention adopts the following technical solutions:

[0015] A vehicle lamp comprises the above-mentioned low-beam projection optical system.

[0016] Compared to the prior art, the present invention has the following beneficial effects: the lens adopts a dual-lens structure consisting of a primary lens and a secondary lens, which occupies a smaller volume and weighs less than a single circular convex lens, uses less lens material, and is less expensive. The visor is eliminated, and by providing a cutoff line at the rear edge of the reflective surface, light emitted by the LED light source is reflected by the reflective surface to form a beam with a cutoff line, which also reduces the installation volume and weight, thereby lowering costs. Light is concentrated into the lens unit, avoiding light loss, resulting in a higher brightness of the light ultimately projected onto the ground. The resulting low-beam light pattern has a clear bright / dark cutoff line. The amount of light from the LED light source that directly enters the lens unit without being reflected by the reflective surface is reduced, so that the vast majority of light from the LED light source is first reflected by the reflective surface before entering the lens unit, thereby reducing stray light in the low-beam III zone and improving the low-beam light pattern. The headlight has the same technical effects as the aforementioned low-beam projection optical system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 This is the front view of the utility model;

[0018] Figure 2 This is a schematic diagram of the structure of the utility model;

[0019] Figure 3 Schematic diagram of the shape of the rear edge of the reflecting surface;

[0020] Figure 4This is the light effect diagram of the utility model.

[0021] Markings in the figure: 1-secondary lens, 2-primary lens, 3-reflector, 4-LED light source, 5-PCB board, 6-heat sink, 11-second light incident surface, 12-second light emitting surface, 21-lens unit, 211-first light incident surface, 212-first light emitting surface, 31-rear end edge. DETAILED DESCRIPTION

[0022] The present invention will be described in detail below with reference to the accompanying drawings.

[0023] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0024] Example 1: This embodiment provides a low-beam projection optical system, such as Figure 1-Figure 4 As shown, it includes a primary lens 2, a secondary lens 1, a reflector 3 and a plurality of LED light sources 4 arranged in a straight line. The reflector 3 includes a plurality of reflective surfaces corresponding one-to-one with the LED light sources 4. The primary lens 2 includes a plurality of lens units 21 connected and corresponding one-to-one with the reflective surfaces. The reflector 3 is arranged above the LED light source 4, the primary lens 2 is arranged in front of the reflector 3, and the secondary lens 1 is arranged in front of the primary lens 2. Any lens unit 21 is a cylindrical convex lens with a cylindrical body along the longitudinal direction, and the secondary lens 1 is a cylindrical convex lens with a cylindrical body along the transverse direction. The rear end edge 31 of any reflective surface is set to a cutoff line shape. The light emitted by the LED light source 4 is reflected by the reflective surface into a light beam with a cutoff line. After passing through the primary lens 2 and the secondary lens 1, the light beam forms a low beam light pattern.

[0025] This optical system emits light toward the front of the vehicle. The above-mentioned "horizontal" and "vertical" refer to the width and height directions of the vehicle, respectively. The primary lens 2 and the secondary lens 1 are spaced apart. The plurality of LED light sources 4 are arranged in a straight line along the horizontal direction. The primary lens 2 and the secondary lens 1 are both strip-shaped, and the length direction of the strips of both are along the horizontal direction. In this embodiment, a total of 7 LED light sources 4, 7 reflective surfaces, and 7 lens units 21 are included.

[0026] Any reflecting surface is an ellipsoidal surface, which includes two focal points, one at the front and one at the rear. Any LED light source 4 is arranged at the rear focal point of the corresponding reflecting surface, and the light emitted by the LED light source 4 is reflected by the reflecting surface and converges into the corresponding lens unit 21.

[0027] The rear end edge 31 of any reflecting surface is arranged on or near the focal line of the secondary lens 1;

[0028] Any lens unit 21 includes a first light-incoming surface 211 and a first light-emitting surface 212, the first light-incoming surface 211 is a plane, and the first light-emitting surface 212 is a convex cylindrical surface; or the first light-incoming surface 211 is a convex cylindrical surface, and the first light-emitting surface 212 is a plane; the secondary lens 1 includes a second light-incoming surface 11 and a second light-emitting surface 12, the second light-incoming surface 11 is a plane, and the second light-emitting surface 12 is a convex cylindrical surface;

[0029] The lateral dimension of the secondary lens 1 ranges from 30 mm to 100 mm, and the longitudinal dimension of the secondary lens 1 ranges from 10 mm to 30 mm;

[0030] It also includes a PCB board 5, and the LED light sources 4 are all arranged on the top surface of the PCB board 5. The light-emitting center axes of the LED light sources 4 are perpendicular to the PCB board 5. The PCB board 5 is arranged at an angle, and its top surface faces the rearward and upward direction; the angle between the PCB board 5 and the optical axis of the low beam type is 10° to 15°; the optical axis of the low beam type is perpendicular to the second light-incoming surface 11.

[0031] A heat sink 6 is also included, and the PCB board 5 is mounted on the heat sink 6 .

[0032] In the utility model adopting the above technical solution, the light emitted by any LED light source 4 enters the corresponding lens unit 21 after being reflected by the corresponding reflecting surface, and the light is converged in the horizontal direction by the lens unit 21 and then enters the secondary lens 1. The light is converged in the longitudinal direction by the secondary lens 1 to form a part of the low beam light pattern. The partial low beam light patterns formed by multiple LED light sources 4 are combined to form a low beam light pattern that meets the requirements; compared with the prior art that uses a single light source and realizes the focusing function through a circular convex lens to form a low beam light pattern, the utility model adopts a dual lens structure of the primary lens 2 and the secondary lens 1, which can achieve the same effect as a single low beam light pattern. The convex lens has the same focusing function as the convex lens. At the same time, each LED light source 4 in the utility model only forms a part of the low beam light type, so the horizontal and vertical dimensions and thickness of the lens unit 21 can be set to be smaller, the volume is smaller, and multiple lens units are connected to form a strip-shaped primary lens 2. At the same time, the secondary lens 1 is also set to a strip-shaped cylindrical convex lens to cooperate with the primary lens 2. The longitudinal dimensions and thickness of both are much smaller than the existing circular convex lens. The two occupy less space, weigh less, use less lens material, and have lower cost. In addition, the shading plate is cancelled, and the rear end edge 31 of the reflecting surface is set to a cutoff line shape, the LED light The light emitted by the source 4 is reflected by the reflecting surface to form a beam with a cut-off line, which also reduces the installation volume and weight, and reduces the cost. Compared with the existing low-beam headlight module, which is large in volume and weight, occupies a large installation space and has high manufacturing costs, the lens of the utility model adopts a double-lens structure of a primary lens and a secondary lens. Compared with a single circular convex lens, it occupies a smaller volume and weight, uses less lens material and has a lower cost. The shading plate is eliminated, and the light emitted by the LED light source is reflected by the reflecting surface to form a beam with a cut-off line by setting the rear end edge of the reflecting surface in a cut-off line shape. The light beam also reduces the installation volume and weight, and reduces the cost; therefore, the utility model is smaller in size and lighter in weight, reduces the installation space occupied, and has a lower manufacturing cost; at the same time, the light is converged into the lens unit to avoid light loss, so that the brightness of the light finally projected on the ground is higher; the formed low beam light pattern has a clear light and dark cut-off line; the light of the LED light source that directly enters the lens unit without being reflected by the reflective surface is reduced, so that most of the light emitted by the LED light source is first reflected by the reflective surface before entering the lens unit, thereby reducing the stray light in the low beam III zone and improving the low beam light pattern effect.

[0033] Embodiment 2, a vehicle lamp, comprising the above-mentioned low-beam projection optical system.

[0034] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A low-beam projection optical system, characterized in that: The invention comprises a primary lens (2), a secondary lens (1), a reflector (3) and a plurality of LED light sources (4) arranged in a line, wherein the reflector (3) comprises a plurality of reflective surfaces corresponding to the LED light sources (4) on a one-to-one basis, and the primary lens (2) comprises a plurality of lens units (21) connected and corresponding to the reflective surfaces on a one-to-one basis; the reflector (3) is arranged above the LED light source (4), the primary lens (2) is arranged in front of the reflector (3), and the secondary lens (1) is arranged in front of the primary lens (2); any of the lens units (21) is a cylindrical convex lens with a column along the longitudinal direction, and the secondary lens (1) is a cylindrical convex lens with a column along the transverse direction; the rear end edge (31) of any of the reflective surfaces is arranged in a cut-off line shape; the light emitted by the LED light source (4) is reflected by the reflective surface into a light beam with a cut-off line, and the light beam forms a low-beam light pattern after passing through the primary lens (2) and the secondary lens (1).

2. The low-beam projection optical system according to claim 1, wherein: Any of the reflecting surfaces is an ellipsoidal surface, which includes two focal points, one at the front and one at the rear; any of the LED light sources (4) is arranged at the rear focal point of the corresponding reflecting surface, and the light emitted by the LED light source (4) is reflected by the reflecting surface and converges into the corresponding lens unit (21).

3. The low-beam projection optical system according to claim 1, wherein: The rear end edge (31) of any one of the reflecting surfaces is arranged on or near the focal line of the secondary lens (1).

4. The low-beam projection optical system according to claim 1, wherein: Any of the lens units (21) comprises a first light-incoming surface (211) and a first light-emitting surface (212), wherein the first light-incoming surface (211) is a plane and the first light-emitting surface (212) is a convex cylindrical surface; or the first light-incoming surface (211) is a convex cylindrical surface and the first light-emitting surface (212) is a plane; the secondary lens (1) comprises a second light-incoming surface (11) and a second light-emitting surface (12), wherein the second light-incoming surface (11) is a plane and the second light-emitting surface (12) is a convex cylindrical surface.

5. The low-beam projection optical system according to claim 1, wherein: The lateral dimension of the secondary lens (1) ranges from 30 mm to 100 mm, and the longitudinal dimension of the secondary lens (1) ranges from 10 mm to 30 mm.

6. The low-beam projection optical system according to claim 1, wherein: It also includes a PCB board (5), the LED light sources (4) are all arranged on the top surface of the PCB board (5), the light-emitting center axes of the LED light sources (4) are all perpendicular to the PCB board (5), and the PCB board (5) is arranged at an angle, with its top surface facing the rear and upper direction.

7. The low-beam projection optical system according to claim 6, wherein: The angle between the PCB board (5) and the optical axis of the low beam is 10° to 15°.

8. The low-beam projection optical system according to claim 1, wherein: It also includes a radiator (6), on which the PCB board (5) is mounted.

9. A vehicle lamp, characterized in that: The low-beam projection optical system comprises the low-beam projection optical system according to any one of claims 1 to 8.

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