Light pattern testing device for automobile lamp assembly

Abstract

The utility model relates to the field of automobile lamps, in particular to a light pattern testing device for an automobile lamp assembly, which comprises a dark cabinet, a Fresnel lens and a light shield, a diffuse reflection screen for projection is fixed in the dark cabinet, the Fresnel lens is movably arranged at a light receiving port of the dark cabinet, and the light shield is arranged at the light receiving port of the dark cabinet. The Fresnel lens is parallel to the diffuse reflection screen all the time, and the light shield is arranged at a light receiving opening of the dark cabinet in an unfolding mode and surrounds the Fresnel lens so as to ensure the darkroom environment in the dark cabinet. The technical problems of low testing efficiency, poor precision and high failure rate caused by the fact that a tested lamp needs to be rotated left and right in the testing process of testing equipment in the prior art are solved.

Description

Technical Field

[0001] The utility model relates to the field of vehicle lamps, in particular to a light pattern testing device for an automobile lamp assembly. Background Art

[0002] In existing technology, testing vehicle lamps typically involves an integrated darkroom consisting of a glass lens and a cabinet. The glass lens is fixed to the cabinet to provide a light-enclosed test environment. The integrated darkroom is equipped with a diffuse reflective screen, and an industrial camera is housed within the integrated cabinet and fixed above the glass lens. The glass lens, diffuse reflective screen, and industrial camera are fixed and immovable. Light from the vehicle lamp under test passes through the glass lens and is projected onto the diffuse reflective screen. The industrial camera uses the grayscale value of the image to determine whether the light pattern meets regulatory requirements.

[0003] However, due to the small measurement distance designed for the testing equipment, headlights that emit light at large left and right angles and over a wide range cannot all be projected onto the diffuse reflection screen. It is necessary to first perform a partial light pattern test on the headlights being tested, then rotate the headlights left and right before testing again. This results in low test efficiency, poor repeatability, and a high failure rate. Utility Model Content

[0004] In order to solve the technical problem in the prior art that the testing equipment needs to rotate the tested lamp left and right during testing, resulting in low testing efficiency, poor accuracy and high failure rate, the present application proposes a light type testing device for an automobile lamp assembly to solve the above technical problems.

[0005] The technical solution adopted by the utility model to solve its technical problems is:

[0006] The utility model provides a light pattern testing device for an automobile lamp assembly, comprising: a dark cabinet, wherein a diffuse reflection screen for projection is fixed in the dark cabinet; a Fresnel lens, wherein the Fresnel lens is movably arranged at a light receiving port of the dark cabinet, and the Fresnel lens is always parallel to the diffuse reflection screen; and a light shield, wherein the light shield is deployably arranged at the light receiving port of the dark cabinet and surrounds the Fresnel lens, so as to ensure a darkroom environment in the dark cabinet.

[0007] Furthermore, a servo electric cylinder is provided at the light receiving port of the dark cabinet, and the movable part of the servo electric cylinder moves along a straight line after being limited, and the movement trajectory is parallel to the plane where the diffuse reflection screen is located, so that the Fresnel lens fixed on the movable part of the servo electric cylinder is always parallel to the diffuse reflection screen.

[0008] Furthermore, the light shield is arranged on both sides of the Fresnel lens, and the expanded end of the light shield on one side is connected to the movable part of the servo cylinder, so that the light shield is expanded or retracted as the Fresnel lens moves.

[0009] Furthermore, a bracket is installed in the dark cabinet, and the diffuse reflection screen is fixed on the bracket.

[0010] Furthermore, a receiving frame is arranged outside the light receiving port of the dark cabinet to receive the vehicle lamp to be tested.

[0011] Furthermore, the focal length of the Fresnel lens is 700 mm to correspond to the vehicle lamp with a maximum incident angle of 40°.

[0012] Furthermore, a first industrial camera is fixed on the top of the Fresnel lens, and the first industrial camera determines whether the measured vehicle lamp meets the requirements by identifying the grayscale value of the image on the diffuse reflection screen.

[0013] Furthermore, a second industrial camera is fixed to the bottom of the Fresnel lens, and the second industrial camera determines whether the current Fresnel lens needs to be replaced by identifying the color of the lens of the Fresnel lens.

[0014] Based on the above technical solution, the technical effects that can be achieved by the present invention are:

[0015] The light pattern testing device for automobile lamp assemblies of the present invention movably arranges the Fresnel lens at the light receiving port of the dark cabinet, and the Fresnel lens is always parallel to the diffuse reflection screen. The light shield can be deployed at the light receiving port of the dark cabinet to surround the Fresnel lens, thereby ensuring a darkroom environment in the dark cabinet. The test can be performed in sections. Specifically, when it is necessary to test a headlight that emits light at a large angle and a wide range to the left and right, the headlight does not move, and the Fresnel lens is moved to cover the illumination area of ​​the headlight in a segmented manner. Each segment is projected on the diffuse reflection screen for separate testing. There is no need to move the headlight to be tested during the test, thereby avoiding the problem of moving the headlight due to the presence of light in the dark cabinet. The adverse effects of moving the tested vehicle lamp during the test process. It should also be noted that if the Fresnel lens is simply enlarged, although the tested vehicle lamp does not need to be moved during the test, the test results will be affected by external light because the Fresnel lens is too large. The utility model uses a light shield to surround the Fresnel lens to reduce the influence of external light. In summary, the automobile lamp assembly light type test device of the utility model solves the technical problems in the prior art that the testing equipment needs to rotate the tested lamp left and right during the test, resulting in low test efficiency, poor accuracy and high failure rate. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a front view of the light pattern testing device for an automobile lamp assembly according to the present invention;

[0017] Figure 2 The figure is a schematic diagram of the overall internal structure of the light pattern testing device for an automobile lamp assembly according to the present invention.

[0018] Among them, 1-dark cabinet, 11-diffuse reflection screen, 12-servo electric cylinder, 13-bracket, 14-support frame; 2-Fresnel lens; 3-light shield; 4-first industrial camera; 5-second industrial camera. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is in no way intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] like Figure 1-2 As shown, the utility model provides a light pattern testing device for an automobile lamp assembly, comprising a dark cabinet 1, a Fresnel lens 2 and a light shield 3. A diffuse reflection screen 11 for projection is fixed in the dark cabinet 1. The Fresnel lens 2 is movably arranged at the light receiving port of the dark cabinet 1, and the Fresnel lens 2 is always parallel to the diffuse reflection screen 11. The light shield 3 can be deployed to be arranged at the light receiving port of the dark cabinet 1 and surround the Fresnel lens 2 to ensure a darkroom environment in the dark cabinet 1.

[0021] The light type testing device for automobile lamp assembly of the present invention movably arranges Fresnel lens 2 at the light receiving port of dark cabinet 1, and Fresnel lens 2 is always parallel to diffuse reflection screen 11, and light shield 3 can be deployed to be arranged at the light receiving port of dark cabinet 1 to surround Fresnel lens 2, thereby ensuring the darkroom environment in dark cabinet 1, and testing can be performed in sections. Specifically, when it is necessary to test the left and right large-angle and wide-range luminous lamps, the lamps are stationary, and Fresnel lens 2 is moved to cover the illumination area of ​​the lamps in a segmented manner. The projection of each segment on diffuse reflection screen 11 is tested separately, and there is no need to move the lamps to be tested during the test, thereby avoiding This avoids the adverse effects caused by moving the tested vehicle lamp during the test. In addition, it should be noted that if the Fresnel lens 2 is simply enlarged, although the tested vehicle lamp does not need to be moved during the test, the test result will be affected by external light due to the excessive size of the Fresnel lens 2. The present invention surrounds the Fresnel lens 2 with a light shield 3 to reduce the influence of external light. In summary, the automobile lamp assembly light pattern test device of the present invention solves the technical problem in the prior art that the testing equipment needs to rotate the tested lamp left and right during the test, resulting in low test efficiency, poor accuracy and high failure rate.

[0022] In a specific embodiment of the present invention, the Fresnel lens 2 is driven by a servo electric cylinder 12. Specifically, a servo electric cylinder 12 is provided at the light receiving port of the dark cabinet 1. The movable part of the servo electric cylinder 12 moves along a straight line after being limited, and the motion trajectory is parallel to the plane where the diffuse reflection screen 11 is located, so that the Fresnel lens 2 fixed on the movable part of the servo electric cylinder 12 is always parallel to the diffuse reflection screen 11.

[0023] In order to ensure the shading effect of the light shielding hood 3, the light shielding hood 3 is arranged on both sides of the Fresnel lens 2, and the expanded end of the light shielding hood 3 on one side is connected to the movable part of the servo electric cylinder 12, so that the light shielding hood 3 can be expanded or retracted as the Fresnel lens 2 moves.

[0024] In a specific embodiment of the present invention, a bracket 13 is installed in the dark cabinet 1 , and the diffuse reflection screen 11 is fixed on the bracket 13 .

[0025] In a specific embodiment of the present invention, a receiving frame 14 is disposed outside the light receiving port of the dark cabinet 1 to receive the vehicle lamp to be tested.

[0026] In a specific embodiment of the present invention, the focal length of the Fresnel lens 2 is 700 mm to correspond to the vehicle lamp with a maximum incident angle of 40°.

[0027] In a specific embodiment of the present invention, a first industrial camera 4 is fixed on the top of the Fresnel lens 2. The first industrial camera 4 determines whether the measured vehicle lamp meets the requirements by identifying the grayscale value of the image on the diffuse reflection screen 11. Specifically, the first industrial camera 4 uses the grayscale value of the image to determine whether the light type meets the regulatory requirements.

[0028] In a specific embodiment of the present invention, a second industrial camera 5 is fixed to the bottom of the Fresnel lens 2. The second industrial camera 5 determines whether the current Fresnel lens 2 needs to be replaced by identifying the color of the lens of the Fresnel lens 2. Specifically, the second industrial camera 5 uses color judgment to detect defects of the Fresnel lens 2, such as whether it is yellowing, bluing, and color temperature.

[0029] Furthermore, using two upper and lower industrial cameras for simultaneous detection can effectively improve the image processing speed.

[0030] It should be understood that the specific embodiments described above are only used to explain the present invention and are not intended to limit the present invention. Obvious changes or modifications derived from the spirit of the present invention are still within the scope of protection of the present invention.

Claims

1. A light pattern testing device for an automobile lamp assembly, characterized in that: include: A dark cabinet (1), wherein a diffuse reflection screen (11) for projection is fixed inside the dark cabinet (1); A Fresnel lens (2), wherein the Fresnel lens (2) is movably arranged at the light receiving port of the dark cabinet (1), and the Fresnel lens (2) is always parallel to the diffuse reflection screen (11); A light shield (3) is deployably arranged at the light receiving port of the dark cabinet (1) and surrounds the Fresnel lens (2) to ensure a darkroom environment in the dark cabinet (1).

2. The light pattern testing device for automobile lamp assembly according to claim 1, characterized in that: A servo electric cylinder (12) is disposed at the light receiving port of the dark cabinet (1), and the movable part of the servo electric cylinder (12) moves along a straight line after being limited, and the movement trajectory is parallel to the plane where the diffuse reflection screen (11) is located, so that the Fresnel lens (2) fixed on the movable part of the servo electric cylinder (12) is always parallel to the diffuse reflection screen (11).

3. The light pattern testing device for automobile lamp assembly according to claim 2, characterized in that: The light shield (3) is arranged on both sides of the Fresnel lens (2), and the unfolded end of the light shield (3) on one side is connected to the movable part of the servo electric cylinder (12), so that the light shield (3) is unfolded or retracted as the Fresnel lens (2) moves.

4. The light pattern testing device for automobile lamp assembly according to claim 1, characterized in that: A bracket (13) is installed in the dark cabinet (1), and the diffuse reflection screen (11) is fixed on the bracket (13).

5. The light pattern testing device for automobile lamp assembly according to claim 1, characterized in that: The outside of the light receiving port of the dark cabinet (1) is provided with a receiving frame (14) for receiving the vehicle lamp to be tested.

6. The light pattern testing device for automobile lamp assembly according to claim 1, characterized in that: The focal length of the Fresnel lens (2) is 700 mm, corresponding to the vehicle lamp with a maximum incident angle of 40°.

7. The light pattern testing device for automobile lamp assembly according to claim 1, characterized in that: A first industrial camera (4) is fixed on the top of the Fresnel lens (2), and the first industrial camera (4) determines whether the measured vehicle lamp meets the requirements by identifying the gray value of the image on the diffuse reflection screen (11).

8. The light pattern testing device for automobile lamp assembly according to claim 1, characterized in that: A second industrial camera (5) is fixed to the bottom of the Fresnel lens (2), and the second industrial camera (5) determines whether the current Fresnel lens (2) needs to be replaced by identifying the color of the lens of the Fresnel lens (2).

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