Detection device for detecting a vehicle headlamp

Abstract

The utility model discloses a detection equipment for detecting vehicle headlamp relates to vehicle parts detection technical field. Detection equipment includes diaphragm, receiving screen and lens, and diaphragm forms with the light -transmitting hole of being suitable for with the light source of being detected directly opposite, receiving screen sets up in the light -transmitting direction of diaphragm setting in one side of diaphragm, and lens sets up between receiving screen and diaphragm, and both sides surface of lens thickness direction are all convex, wherein receiving screen forms the imaging surface towards lens, and the distance between imaging surface and diaphragm is d and satisfies: 1300mm <= d <= 1600mm. According to the detection equipment of the utility model, through the long-distance light type effect of vehicle headlamp equivalent conversion to receiving screen through lens, whole detection equipment can be arranged in the relatively smaller space, and the occupation of production site is saved, and the site cost of enterprise is reduced.

Description

Technical Field

[0001] This utility model relates to the field of vehicle parts testing technology, and in particular to a testing device for testing vehicle headlights. Background Technology

[0002] Vehicle headlight testing equipment is used to perform optometry tests on vehicle headlights to ensure that the quality and performance of the headlights meet the standards.

[0003] The testing equipment in related technologies has stringent requirements for the testing environment. For example, some equipment requires testing at a screen distance of 25 meters. Such a long spatial distance not only requires a large amount of production space, increasing the company's site costs, but also greatly limits the flexibility of site layout in actual production, making it difficult to adapt to the compact and efficient space utilization needs of production workshops. Utility Model Content

[0004] This invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one objective of this invention is to provide a testing device for inspecting vehicle headlights. According to this invention, by converting the long-distance beam pattern of the vehicle headlights to a receiving screen via a lens, the entire testing device can be arranged in a relatively small space, saving on production site space and reducing the company's site costs.

[0005] The detection device according to this utility model is used to detect vehicle headlights. The detection device includes: an aperture with a light-transmitting hole adapted to face the light source to be detected; a receiving screen disposed on one side of the aperture in the light-emitting direction; and a lens disposed between the receiving screen and the aperture, wherein both sides of the lens in the thickness direction are convex. The receiving screen has an imaging surface facing the lens, and the distance between the imaging surface and the aperture is d, which satisfies: 1300mm≤d≤1600mm.

[0006] According to the detection equipment of this utility model, the light pattern effect of a vehicle headlight at a relatively long distance (such as 25m as required in related technologies) is equivalently converted onto a receiving screen at a short distance using a lens. A reasonable range of distance d ensures that the light refracted by the lens accurately presents similar light pattern characteristics on the receiving screen as at a long distance. Compared to detection equipment in related technologies that requires a larger detection space, the distance d between the imaging surface and the aperture is between 1300mm and 1600mm, allowing the entire detection equipment to be arranged in a relatively small space. This saves on production site space, reduces site costs for enterprises, and also improves the flexibility of site layout, better adapting to the compact and efficient space utilization needs of production workshops.

[0007] According to some embodiments of the present invention, the distance between the lens and the imaging surface is s1 and satisfies: 950mm≤s1≤1050mm.

[0008] According to some embodiments of this utility model, the lens has a thickness of t and an aperture of D, and satisfies the following condition: t / D > 1 / 5.

[0009] According to some embodiments of this utility model, the thickness t of the lens satisfies: 70mm≤t≤75mm.

[0010] According to some embodiments of the present invention, the distance between the lens and the aperture is s2 and satisfies: 380mm≤s2≤420mm.

[0011] According to some embodiments of the present invention, the refractive index of the lens is n and satisfies: 1.49≤n≤1.50.

[0012] According to some embodiments of this utility model, the radius of curvature of the surface of the lens facing the aperture is r1, and the radius of curvature of the surface of the lens facing the imaging plane is r2, satisfying: 2.84 × 10⁻⁶. 4 mm≤r1≤2.86×10 4 mm, -4.98×10 2 mm≤r2≤-5.0×10 2 mm.

[0013] According to some embodiments of this utility model, the aperture number of the detection device is F / # and satisfies: F / #<7.5.

[0014] According to some embodiments of the present invention, the equivalent focal length of the detection device is f0 and satisfies: 900mm≤f0≤1000mm.

[0015] According to some embodiments of the present invention, the distortion generated by imaging on the imaging surface is δ and satisfies: δ < 5%.

[0016] Additional aspects and advantages of this invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0017] The above and / or additional aspects and advantages of this utility model will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of a detection device and a light source to be tested according to an embodiment of the present invention; Figure 2 This is a front cross-sectional view of the detection device and the light source to be detected according to an embodiment of the present invention; Figure 3 This is an optical path diagram of a detection device and a light source to be tested according to an embodiment of the present invention; Figure 4 This is a field-of-view light trace diagram of the optical path system consisting of the detection device and the light source to be detected according to an embodiment of the present invention; Figure 5 This is a field curve diagram of the optical path system consisting of a detection device and a light source to be detected according to an embodiment of the present invention; Figure 6 This is a distortion diagram of the optical path system formed by the detection device and the light source to be detected according to an embodiment of the present invention; Figure 7 This is a simplified diagram of the light pattern cutoff line formed on the imaging surface of the receiving screen of the detection device according to an embodiment of the present invention.

[0018] Figure 8 This invention relates to a detection device according to an embodiment of the present invention, which converts the light pattern parameters required by regulations at a specific distance to the corresponding parameters of the planar screen at another distance. The device is used to detect the regulatory point at a headlight at 25m. Figure 9 This is a conversion table of the planar regulatory points at 1m from the headlight, which is a detection device according to an embodiment of the present invention, that converts the light pattern parameters required by regulations at a specific distance to the corresponding parameters of the planar screen at another distance.

[0019] Figure label: 1. Testing equipment; 11. Aperture; 12. Receiving screen; 121. Imaging plane; 13. Lens; 2. The light source to be tested. Detailed Implementation

[0020] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this utility model, and should not be construed as limiting this utility model.

[0021] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating the orientation or positional relationship shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model. Furthermore, features defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more. In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0022] The testing equipment in related technologies has stringent requirements for the testing environment. For example, some equipment requires testing at a screen distance of 25 meters. Such a long spatial distance not only requires a large amount of production space, increasing the company's site costs, but also greatly limits the flexibility of site layout in actual production, making it difficult to adapt to the compact and efficient space utilization needs of production workshops.

[0023] The following is for reference. Figures 1-9 This invention describes a testing device 1 for testing vehicle headlights according to an embodiment of the present invention.

[0024] The testing device 1 according to this utility model is used to test vehicle headlights, such as... Figures 1-3 As shown, the detection device 1 includes an aperture 11, a receiving screen 12, and a lens 13. The aperture 11 has a light-transmitting hole that is adapted to face the light source 2 to be detected. The light-transmitting hole is used to control the range of light passing through, so that the light passing through the light-transmitting hole has a suitable angle and distribution.

[0025] The receiving screen 12 is positioned on one side of the aperture 11 in the direction of light emission. The receiving screen 12 is used to receive the light after it has been processed by the lens 13, forming a corresponding light pattern image for optometry testing.

[0026] Lens 13 is positioned between receiving screen 12 and aperture 11, and both surfaces of lens 13 in the thickness direction are convex. When light passing through aperture 11 reaches lens 13, lens 13 uses its optical refraction properties to deflect and focus the light. Lens 13 can converge and readjust light rays that originally had a certain angular distribution, so that the light can form a clear and accurate light pattern image on receiving screen 12, achieving an equivalent transformation of long-distance light effects.

[0027] The receiving screen 12 forms an imaging surface 121 facing the lens 13. The imaging surface 121 is where light finally converges and forms an image. By analyzing the light pattern on the imaging surface 121, such as the shape of the light pattern, brightness distribution, and cutoff line, the optical performance indicators of the headlight can be obtained, thereby determining whether the headlight meets the relevant standards and requirements.

[0028] The distance between the imaging plane 121 and the aperture stop 11 is d and satisfies: 1300mm≤d≤1600mm.

[0029] According to the detection device 1 of this utility model, the light pattern effect of a vehicle headlight at a relatively long distance (such as 25m as required in related technologies) is equivalently converted onto a receiving screen 12 at a short distance by a lens 13. A reasonable range of distance d ensures that the light refracted by the lens 13 can accurately present similar light pattern characteristics on the receiving screen 12 as at a long distance. Compared to the detection device 1 in related technologies, which requires a larger detection space, the distance d between the imaging surface 121 and the aperture 11 is between 1300mm and 1600mm, allowing the entire detection device 1 to be arranged in a relatively small space. This saves on production site space, reduces site costs for enterprises, and also improves the flexibility of site layout, better adapting to the compact and efficient space utilization needs of production workshops.

[0030] Therefore, according to the detection device 1 of this utility model, by converting the long-distance light pattern effect of the vehicle headlights to the receiving screen 12 through the lens 13, the entire detection device 1 can be arranged in a relatively small space, saving the occupation of the production site and reducing the site cost of the enterprise.

[0031] According to some embodiments of this utility model, such as Figure 1 As shown, the distance between lens 13 and imaging surface 121 is s1 and satisfies: 950mm≤s1≤1050mm. The distance s1 between lens 13 and imaging surface 121 is used as the image distance. Its value range of 950mm-1050mm ensures that the light emitted from aperture 11 and refracted by lens 13 is clearly and accurately imaged on imaging surface 121 according to optical laws, thereby obtaining true and reliable light pattern information of the vehicle headlight.

[0032] The distance s1 between lens 13 and imaging surface 121 is within the distance d between imaging surface 121 and aperture stop 11, ensuring that the light pattern characteristics presented on imaging surface 121 after refraction by lens 13 are similar to the actual light pattern of a headlight at a distance. If s1 is too small, the propagation and refraction process of light cannot be fully unfolded, resulting in poor equivalent effect and inability to accurately simulate the light pattern at a distance; if s1 is too large, it will increase the overall size of the device, violating the design goal of reducing the detection space.

[0033] Limiting the distance s1 between lens 13 and imaging surface 121 to between 950mm and 1050mm helps optimize the spatial layout of the entire detection device 1, enabling the device to maintain a relatively compact structure and reduce the footprint of the device while meeting optical performance requirements.

[0034] According to some embodiments of this utility model, the lens 13 has a thickness of t and an aperture of D, satisfying that t / D > 1 / 5. The thickness t refers to the dimension of the lens 13 along the optical axis, that is, the perpendicular distance from one surface of the lens 13 to another. The aperture D is the effective diameter of the lens 13 capable of receiving light.

[0035] When t / D > 1 / 5, the lens 13 is relatively thick, which can optimize the refraction and focusing effect of the lens 13 on the light to a certain extent. The lens 13 meets the requirements, which helps to realize the equivalent transformation process of the long-distance beam pattern effect of the vehicle headlights onto the receiving screen 12 through the lens 13. The thicker lens 13 can more effectively deflect and focus the light, so that the light with a certain angular distribution can form a beam pattern feature on the receiving screen 12 that is similar to that at a long distance after passing through the lens 13.

[0036] According to some embodiments of this utility model, such as Figure 1 As shown, the thickness t of lens 13 satisfies: 70mm≤t≤75mm. When the thickness t of lens 13 is in the range of 70mm-75mm, it can provide sufficient refraction path and refraction angle change for light, ensuring that the light is focused according to the expected optical law, so that the light pattern on the imaging surface 121 at a distance of about 1m from lens 13 is similar to the actual light pattern of the headlight at a distance.

[0037] The distance s1 between lens 13 and imaging surface 121 is within the distance d between imaging surface 121 and aperture stop 11, and the thickness of lens 13 is within the range of 70mm-75mm, so as to minimize the overall size of the device while meeting the optical performance requirements.

[0038] According to some embodiments of this utility model, the distance between lens 13 and aperture 11 is s2 and satisfies: 380mm≤s2≤420mm. A distance s2 between lens 13 and aperture 11 within the range of 380mm-420mm ensures that light rays emitted from aperture 11 enter lens 13 at a reasonable angle and range, allowing lens 13 to receive sufficient light rays from the aperture of aperture 11, and these rays are evenly distributed across the effective aperture of lens 13.

[0039] The distance d between the imaging plane 121 and the aperture stop 11 is limited to between 1300mm and 1600mm, and the distance s1 between the lens 13 and the imaging plane 121 is limited to between 950mm and 1050mm. The distance s2 between the lens 13 and the aperture stop 11 is in the range of 380mm and 420mm, which helps to optimize the spatial layout of the entire device and make the relative positions between various optical components more reasonable.

[0040] According to some embodiments of this utility model, the refractive index of lens 13 is n and satisfies: 1.49 ≤ n ≤ 1.50. The refractive index is used to measure the degree of refraction of light as it propagates in a medium. When the refractive index n of lens 13 is in the range of 1.49-1.50, the light rays emitted from aperture 11 and directed towards lens 13 can obtain a suitable refraction angle. The light rays can propagate within lens 13 along the expected path and ultimately converge accurately onto the imaging surface 121 of receiving screen 12, thereby forming a clear and accurate headlight pattern image.

[0041] The refractive index n of lens 13 is between 1.49 and 1.50, which allows for better matching of the optical parameters of other components, ensuring the coordinated operation of the entire optical system. A suitable refractive index allows light rays emitted from aperture 11 to enter lens 13 at a reasonable angle and range, achieving effective control and propagation of the light. The light rays passing through lens 13 can form a suitable optical pattern image on receiving screen 12, facilitating subsequent analysis and detection.

[0042] According to some embodiments of this utility model, the radius of curvature of the surface of lens 13 facing aperture 11 is r1, and the radius of curvature of the surface of lens 13 facing imaging plane 121 is r2, satisfying: 2.84 × 10⁻⁶. 4 mm≤r1≤2.86×10 4 mm, -4.98×10 2 mm≤r2≤-5.0×10 2mm. Taking the direction of light propagation as positive, the radius of curvature r1 of the surface of lens 13 facing the aperture 11 is positive, while the radius of curvature r2 of the surface of lens 13 facing the imaging plane 121 is negative. Both surfaces are convex, and the radius of curvature of each surface determines the curvature shape of the surface, which in turn affects the propagation path and focusing characteristics of light in lens 13.

[0043] The radius of curvature r1 of the surface of lens 13 facing aperture 11 is 2.84 × 10⁻⁶. 4 mm to 2.86×10 4 Between mm, the curvature is small, so the surface is relatively flat, which makes the change in the refraction angle relatively gradual when light passes through the lens 13 toward the surface of the aperture 11, and the refraction effect on the light is relatively weak.

[0044] The radius of curvature r2 of the surface of lens 13 facing the imaging plane 121 is -4.98 × 10⁻⁶. 2 mm to -5.0×10 2 Between mm, it can further adjust the light after it has been refracted by the front surface, so that it can be better focused on the imaging surface 121.

[0045] The value of r1 ensures that the light does not become too concentrated when it enters the lens 13, providing sufficient space for subsequent propagation inside the lens 13 and focusing on the surface of r2; while the value of r2 ensures that the light accurately converges onto the imaging surface 121 after passing through the lens 13, meeting the device's requirements for imaging position and clarity, enabling the entire detection device 1 to achieve efficient and accurate optical detection functions within a compact space.

[0046] According to some embodiments of this utility model, the aperture number of the detection device 1 is F / # and satisfies: F / # < 7.5. The aperture number reflects the ability of the optical system to collect light and the depth of field of the image. A smaller aperture number means a relatively larger entrance pupil diameter, which can collect more light at the same focal length; while a larger aperture number means a smaller entrance pupil diameter and a relatively weaker ability to collect light.

[0047] Keeping the aperture number F / # within the range of less than 7.5 helps to enhance the detection device 1's ability to receive light emitted from the headlight, allowing more light to pass through the lens 13 and eventually reach the receiving screen 12, thereby forming a sufficiently bright and easily analyzable light pattern image on the imaging surface 121.

[0048] According to some embodiments of this utility model, the equivalent focal length of the detection device 1 is f0 and satisfies: 900mm≤f0≤1000mm. The equivalent focal length f0 determines the optical system's ability to converge light and the size and proportion of the final image.

[0049] By controlling the equivalent focal length f0 within the range of 900mm to 1000mm, it is ensured that the light rays transmitted from the aperture 11, after passing through the lens 13, form a light pattern image of appropriate size and accurate proportion on the receiving screen 12 within a limited imaging distance d (1300mm~1600mm). The focal length range of 900mm to 1000mm gives the optical system sufficient converging capability, enabling it to effectively deflect and focus the light rays emitted by the headlamp, which have a certain divergence angle, thereby clearly presenting the light pattern characteristics at a long distance (e.g., 25m) on the receiving screen 12, achieving accurate equivalent conversion.

[0050] The design parameters of the optical path system consisting of the detection device and the light source to be detected according to an embodiment of the present invention are provided in Table 1 below.

[0051]

[0052] The parameters of each optical component of the detection device according to one embodiment of the present invention are provided below with reference to Table 2.

[0053]

[0054] Among them, the surface of lens 13 facing the aperture stop 11 is S1, and the surface of lens 13 facing the imaging plane 121 is S2.

[0055] Figure 4 This is a field-of-view light trace diagram of the optical path system formed by the detection device 1 and the light source 2 to be tested according to an embodiment of the present invention. It shows the propagation path of light in the optical path system. By depicting the direction of light under different field-of-view angles, it can reflect the specific trajectory of the light emitted by the light source 2 to be tested after passing through each optical element in the detection device 1.

[0056] Figure 5 This is a field curvature diagram of the optical path system comprising the detection device 1 and the light source 2 to be tested, according to an embodiment of the present invention. Field curvature is an important aberration of an optical system, describing the deviation between the focused position and the ideal imaging position of light rays at different fields of view on the imaging plane 121. By plotting the position change curves of the imaging point corresponding to different field angles in the direction perpendicular to the optical axis, the field curvature characteristics of the optical path system can be quantified.

[0057] Figure 6This is a distortion diagram of the optical path system comprising a detection device 1 and a light source 2 according to an embodiment of the present invention. Distortion is an optical aberration, manifested as a proportional distortion of the image relative to an ideal image. Distortion causes shape deformation in the image, resulting in a difference in geometric shape between the actual image and the ideal image. The distortion diagram intuitively shows the degree of distortion of the image at different field of view angles. By depicting the positional deviation of the actual imaging point relative to the ideal imaging point, it can clearly reflect different types of distortion characteristics such as pincushion distortion or barrel distortion existing in the optical path system.

[0058] According to some embodiments of this utility model, such as Figure 6 As shown, the distortion produced by imaging on imaging plane 121 is δ and satisfies: δ < 5%. The distortion rate δ is used to quantify the magnitude of the distortion.

[0059] By controlling the distortion δ of the imaging surface 121 to within 5%, it is possible to ensure that the light pattern image presented on the receiving screen 12 has high fidelity in shape and proportion. This is crucial for headlight refraction testing, as the shape of the light pattern, the position and angle of the cutoff line, etc., are key features for determining whether it meets the standards. Lower distortion means that the pattern on the imaging surface 121 is geometrically highly similar to the actual light pattern of the headlight at a distance, thus ensuring the accuracy and reliability of the test results.

[0060] The following describes a method for using a detection device 1 according to an embodiment of the present invention to equivalently convert the optical parameters required by regulations at a specific distance to the corresponding parameters of a planar screen at another distance.

[0061] like Figure 7 As shown, the light pattern near the cutoff line of the headlight module is selected as the research object, and the two inflection points A and B of the cutoff line on this light pattern are taken as key feature points. For these two key feature points, their angular coordinates and light intensity information values ​​can be obtained through simulation on a screen at 25m; at the same time, the linear coordinates and light intensity information of these two points can also be obtained on a screen at 1m. Based on the parameters obtained from these two sets of different distances, a conversion calculation is performed using a pre-set proportional relationship, thereby accurately converting the angular coordinates and light intensity information of the key feature points corresponding to the light pattern at 25m into the corresponding linear coordinates and light intensity information at the 1m screen.

[0062] The above conversion method can be used according to the implementation plan. Figure 8 and Figure 9 The detailed conversion process shown clearly and accurately completes the parameter conversion. Furthermore, based on the converted parameter information, it is possible to easily and quickly identify special points in the light pattern, thereby providing a strong basis for a comprehensive and accurate assessment of whether the headlight module's light pattern meets regulatory requirements.

[0063] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0064] Although embodiments of the present invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A testing device for testing vehicle headlights, characterized in that, include: An aperture (11) is formed with a light-transmitting hole adapted to be directly opposite the light source (2) to be detected; A receiving screen (12) is disposed on one side of the light-emitting direction of the aperture (11); A lens (13) is disposed between the receiving screen (12) and the aperture (11), and both sides of the lens (13) in the thickness direction are convex. The receiving screen (12) has an imaging surface (121) facing the lens (13), and the distance between the imaging surface (121) and the aperture (11) is d and satisfies: 1300mm≤d≤1600mm.

2. The detection device according to claim 1, characterized in that, The distance between the lens (13) and the imaging surface (121) is s1 and satisfies: 950mm≤s1≤1050mm.

3. The detection device according to claim 2, characterized in that, The lens (13) has a thickness of t and an aperture of D, and satisfies the following condition: t / D > 1 / 5.

4. The detection device according to claim 3, characterized in that, The thickness t of the lens (13) satisfies: 70mm≤t≤75mm.

5. The detection device according to claim 2, characterized in that, The distance between the lens (13) and the aperture (11) is s2 and satisfies: 380mm≤s2≤420mm.

6. The detection device according to claim 5, characterized in that, The refractive index of the lens (13) is n and satisfies: 1.49≤n≤1.

50.

7. The detection device according to claim 6, characterized in that, The radius of curvature of the surface of the lens (13) facing the aperture (11) is r1, and the radius of curvature of the surface of the lens (13) facing the imaging plane (121) is r2, satisfying: 2.84 × 10⁻⁶. 4 mm≤r1≤2.86×10 4 mm, -4.98×10 2 mm≤r2≤-5.0×10 2 mm.

8. The detection device according to claim 1, characterized in that, The aperture number of the detection device is F / # and satisfies: F / # < 7.

5.

9. The detection device according to claim 1, characterized in that, The equivalent focal length of the detection device is f0 and satisfies: 900mm≤f0≤1000mm.

10. The detection device according to claim 1, characterized in that, The distortion generated by imaging on the imaging surface (121) is δ and satisfies: δ < 5%.

Images