Light source detection system

Abstract

The utility model discloses a light source detection system, which comprises a box body, the lens is arranged at one end of the box body, so that emergent light of the detected light source enters the lens and enters the box body after passing through the lens; the transmission film and the detection device are both arranged in the box body, the transmission film is arranged on a light path between the lens and the detection device, so that light entering the box body from the lens is imaged on the transmission film, and the detection device is used for obtaining transmission light of the transmission film and generating an image so as to obtain a detection result of the detected light source according to the image. Compared with the prior art that a diffuse reflection plate and detection equipment are used for obliquely shooting to image a projection picture, the transmission film is used, transmission light of the transmission film can be obtained through the detection device to generate an image, trapezoidal distortion can be prevented from being introduced, the whole projection picture can be clearly imaged, and the detection accuracy can be improved.

Description

Technical Field

[0001] The utility model relates to the field of optical detection, in particular to a light source detection system. Background Art

[0002] In the prior art, in order to meet the requirements of automobile headlight production line inspection, a zoom lens is used to zoom the projection image of the headlight onto a diffuse reflection board at a close distance for inspection and analysis, such as a diffuse reflection board within 1 meter. The inspection equipment can only capture the projection image by shooting at an angle. This prior art has the following problems: the oblique shooting method of the inspection equipment will introduce trapezoidal distortion into the captured projection image, which will affect the detection of the light intensity or luminous flux of the headlight, and is not conducive to the inspection equipment to clearly image the entire projection image, and is not conducive to capturing a full-frame clear projection image, which will affect the accuracy of the inspection. Utility Model Content

[0003] The utility model aims to provide a light source detection system, which helps to improve detection accuracy compared with the prior art.

[0004] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0005] A light source detection system, comprising:

[0006] Box;

[0007] A lens is arranged at one end of the box body, so that the outgoing light of the light source to be tested is incident on the lens and enters the box body after passing through the lens;

[0008] A transmissive film and a detection device are both arranged in the box, and the transmissive film is arranged on the optical path between the lens and the detection device, so that the light entering the box through the lens is imaged on the transmissive film. The detection device is used to obtain the transmitted light of the transmissive film and generate an image, so as to obtain the detection result of the light source to be detected based on the image.

[0009] Optionally, the lens is a zoom lens.

[0010] Optionally, it also includes:

[0011] A lens fixing member is arranged on the box body, and is used to fix the lens so that the lens extends out of the box body.

[0012] Optionally, the lens fixing member may be provided with at least one through hole, so that a cable connected to the lens extends out through the through hole on the lens fixing member.

[0013] Optionally, it also includes:

[0014] The first light shielding plate and the second light shielding plate are both arranged in the box body, and the first light shielding plate is arranged on the optical path between the lens and the transmissive film to block the stray light in the light entering the box body from the lens, and the second light shielding plate is arranged on the optical path between the transmissive film and the detection device to block the stray light in the transmitted light of the transmissive film.

[0015] Optionally, the aperture of the first light shielding plate satisfies: 4L*tan(θ / 2)>D>8 / 3*L*tan(θ / 2), D represents the aperture of the first light shielding plate, L represents the distance from the first light shielding plate to the lens, θ represents the field of view angle of the light source to be tested, and the aperture of the second light shielding plate is consistent with the aperture of the first light shielding plate.

[0016] Optionally, it also includes:

[0017] The transmissive film fixing part is used for installing the transmissive film. A slide rail is arranged on the box body, and the transmissive film fixing part can move along the slide rail.

[0018] Optionally, it also includes:

[0019] The detection device fixing part is used for installing the detection device, and the detection device fixing part includes a three-axis rotation mechanism and / or an up-down translation mechanism and / or a left-right translation mechanism.

[0020] Optionally, the box body is a closed box body, and at least one detachable baffle is provided on the side wall of the box body, so that an operation opening is formed on the side wall of the box body when the baffle is removed.

[0021] Optionally, at least one through hole is provided on a side wall of the box body close to one end of the detection device, so that a cable to be connected to the detection device extends into the box body through the through hole.

[0022] It can be seen from the above technical scheme that a light source detection system provided by the utility model includes: a box body; a lens, which is arranged at one end of the box body, so that the outgoing light of the light source to be detected is incident on the lens and enters the box body after passing through the lens; a transmission film and a detection device, both of which are arranged in the box body and the transmission film is arranged on the optical path between the lens and the detection device, so that the light entering the box body through the lens is imaged on the transmission film, and the detection device is used to obtain the transmitted light of the transmission film and generate an image, so as to obtain the detection result of the light source to be detected based on the image.

[0023] Compared with the prior art which uses diffuse reflection plates and requires detection equipment to shoot obliquely to image the projection screen, the light source detection system of the utility model allows the outgoing light of the light source to be detected to be incident on the lens and enter the box after passing through the lens. The light entering the box from the lens is further incident on the transmissive film. The transmitted light of the transmissive film can be obtained by the detection device to generate an image, which can avoid introducing trapezoidal distortion, facilitate clear imaging of the entire projection screen, and help improve detection accuracy. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A perspective view of a light source detection system provided by an embodiment of the utility model observed from the front direction;

[0026] Figure 2 for Figure 1 A perspective view of the light source detection system shown as viewed from the rear;

[0027] Figure 3 for Figure 1 A left side view of the light source detection system shown;

[0028] Figure 4 for Figure 1 A right side view of the light source detection system shown;

[0029] Figure 5 for Figure 1 A perspective view of the light source detection system shown as viewed from above;

[0030] Figure 6 A flow chart of a method for performing light source detection using a light source detection system provided in one embodiment of the utility model.

[0031] The reference numerals in the drawings of the specification include:

[0032] 101 - housing, 102 - lens, 103 - transmissive film, 104 - detection device, 105 - first shading plate, 106 - second shading plate, 107 - lens fixing part, 108 - transmissive film fixing part, 109 - detection device fixing part, 110 - baffle, 111 - slide rail. DETAILED DESCRIPTION

[0033] In order to enable those skilled in the art to better understand the technical solutions in the present invention, 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 described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0034] This embodiment provides a light source detection system, including:

[0035] Box;

[0036] A lens is arranged at one end of the box body, so that the outgoing light of the light source to be tested is incident on the lens and enters the box body after passing through the lens;

[0037] A transmissive film and a detection device are both arranged in the box, and the transmissive film is arranged on the optical path between the lens and the detection device, so that the light entering the box through the lens is imaged on the transmissive film. The detection device is used to obtain the transmitted light of the transmissive film and generate an image, so as to obtain the detection result of the light source to be detected based on the image.

[0038] The lens is arranged at one end of the box, the transmissive film and the detection device are both arranged in the box, and the transmissive film is arranged on the optical path between the lens and the detection device. Then, the outgoing light of the light source to be detected can be incident on the lens and enter the box after passing through the lens. The light entering the box from the lens can further be incident on the transmissive film and can be imaged on the transmissive film. The light can pass through the transmissive film, and the detection device can obtain the transmitted light of the transmissive film and generate an image, so as to obtain the detection result of the light source to be detected according to the image.

[0039] Compared with the prior art which uses diffuse reflection plates and requires detection equipment to shoot obliquely to image the projection screen, the light source detection system of this embodiment allows the outgoing light of the light source to be detected to be incident on the lens and enter the box after passing through the lens. The light entering the box from the lens is further incident on the transmissive film and is imaged on the transmissive film. The transmitted light of the transmissive film can be obtained by the detection device to generate an image, which can avoid introducing trapezoidal distortion, facilitate clear imaging of the entire projection screen, and help improve detection accuracy.

[0040] In some embodiments, the lens is a zoom lens, that is, the focal length of the lens can be changed. In practical applications, the focal length of the lens can be adjusted so that the light emitted by the light source to be tested can be clearly imaged on the transmission film after passing through the lens. The use of a zoom lens allows the light source detection system to test headlights of different projection distances, reducing the test space loss. In addition, the zoom lens can be used to reduce the image projected by the light emitted by the light source to be tested after passing through the projection image and projected onto the transmission film, ensuring that the detection device can capture the entire image projected by the light emitted by the light source to be tested after passing through the projection image, while reducing the depth of field limitation and influence of the detection device. In a specific example, for example, the projection distance of most headlights is 5m-25m at present. The light source detection system adopts a zoom lens design to achieve an adjustable projection distance of 5m-25m. Both traditional headlights and intelligent projection headlights can be applied to the same detection space solution, and reduce space loss. In this embodiment, the number of lenses included in the lens, the surface shape and material of the lens are not limited, and can be set according to application requirements in practical applications.

[0041] In some embodiments, the lens extends out of the box, which helps the outgoing light of the light source to be tested to enter the lens, helps to provide a good test environment, and facilitates the adjustment of the lens. In some embodiments, the light source detection system may also include: a lens fixing member, which is arranged on the box, and the lens fixing member is used to fix the lens. The lens fixing member may also be called a lens clamp. Further, the lens fixing member is used to fix the lens so that the lens extends out of the box. For example, reference may be made to Figure 1 , Figure 1 A perspective view of a light source detection system provided by an embodiment as viewed from the front direction, Figure 2 for Figure 1 The light source detection system shown is a perspective view viewed from the back, Figure 3 for Figure 1 The left side view of the light source detection system shown, Figure 4 for Figure 1 The right side view of the light source detection system shown, Figure 5 for Figure 1 The light source detection system shown is a perspective view observed from above. As shown in the figure, a lens fixing member 107 is provided at one end of the box body 101, and the lens 102 is installed through the lens fixing member 107 and the lens 102 extends outward. Specifically, the lens fixing member 107 is provided on the outer side of the side wall at one end of the box body 101, and the lens 102 can be located at the center of the side wall at one end of the box body 101, for example, the lens 102 can be provided at the center of the left cavity side wall of the box body 101.

[0042] The transmission film 103 refers to a film that can transmit light incident on the transmission film 103. The transmission film 103 is set in the light source detection system, so that the outgoing light of the light source to be detected is imaged on the transmission film 103 after passing through the lens 102, so that the detection device 104 can obtain an image by acquiring the transmitted light of the transmission film 103. Compared with the prior art that uses a diffuse reflection plate and requires the detection device to obliquely shoot the diffuse reflection plate to image the projection screen, the system adopts a transmission light path by using the transmission film 103, so that the light can be symmetrical relative to the optical axis during the process of the outgoing light of the light source to be detected propagating to the detection device 104, which can avoid measurement errors caused by the asymmetry of the light relative to the optical axis, avoid the introduction of trapezoidal distortion, and improve the measurement accuracy. The system eliminates the depth of field effect by using the transmission film 104, and the imaging is clear and distortion is eliminated.

[0043] In this embodiment, the material of the transparent film 103 is not limited, and the transparent film 103 may be, but is not limited to, a polytetrafluoroethylene transparent film. In some embodiments, a left cavity is formed on the left side of the transparent film 103 in the box 101, and a right cavity is formed on the right side of the transparent film 103. The detection device 104 is disposed in the right cavity of the box 101. Figure 1 As shown, the transmissive film 103 may be disposed at the middle position of the box body 101 .

[0044] In some embodiments, the light source detection system may further include: a transmissive film fixture 108 for mounting the transmissive film 103. The transmissive film fixture 108 may include a ring fixture, and the transmissive film 103 is fixed in the ring fixture. In some embodiments, a slide rail 111 is provided on the box 101, and the transmissive film fixture 108 can move along the slide rail 111, so that the transmissive film 103 can move along the optical path from the lens 102 to the detection device 104. The transmissive film fixture 108 may also be referred to as a transmissive film fixture. For example, reference may be made to Figure 1 The transmissive film fixing member 108 fixes the transmissive film 103, and the slide rail 111 is arranged along the optical path from the lens 102 to the detection device 104. The transmissive film fixing member 108 can move along the slide rail 111, so that the position of the transmissive film 103 is adjustable. Figure 1 The slide rail 111 shown has a limited length.

[0045] In some embodiments, the light source detection system may further include: a first light shielding plate 105 and a second light shielding plate 106, both of which are arranged in the box 101, and the first light shielding plate 105 is arranged on the optical path between the lens 102 and the transmissive film 103, and is used to block stray light in the light entering the box 101 from the lens 102, and the second light shielding plate 106 is arranged on the optical path between the transmissive film 103 and the detection device 104, and is used to block stray light in the transmitted light of the transmissive film 103. The first light shielding plate 105 can be considered as an aperture, and the second light shielding plate 106 can be considered as an aperture. Using light shielding plates to filter stray light can improve the accuracy of light source detection. For example, reference can be made to Figure 1 , Figure 2 and Figure 5 As shown, a first light shielding plate 105 is arranged between the lens 102 and the transmission film 103 in the box 101 , and a second light shielding plate 106 is arranged between the transmission film 103 and the detection device 104 in the box 101 .

[0046] The aperture of the first light shielding plate 105 and the aperture of the second light shielding plate 106 can be set according to the designed field of view angle of the light source to be tested. In some embodiments, the aperture of the first light shielding plate 105 satisfies: 4L*tan(θ / 2)>D>8 / 3*L*tan(θ / 2), D represents the aperture of the first light shielding plate, L represents the distance from the first light shielding plate to the lens, θ represents the field of view angle of the light source to be tested, and the aperture of the second light shielding plate 106 is consistent with the aperture of the first light shielding plate 105. Such a setting can better avoid the influence of stray light. The field of view angle of the light source to be tested may include a horizontal field of view angle and a vertical field of view angle. Accordingly, the first light shielding plate 105 and the second light shielding plate 106 can be set as a rectangular aperture, and the length and width of the rectangular aperture are respectively set according to the horizontal field of view angle and the vertical field of view angle of the light source to be tested.

[0047] In some embodiments, the position of the first light shielding plate 105 along the optical path from the lens 102 to the detection device 104 can be changed, and the position of the second light shielding plate 106 along the optical path from the lens 102 to the detection device 104 can be changed. The position of the first light shielding plate 105 can be adjusted according to the field of view angle of the light source to be detected and the aperture size of the first light shielding plate 105, so that the light source detection system can be applied to light source products with different field of view angles. In some embodiments, a card slot is provided on the inner side of the box 101, and the end edge of the first light shielding plate 105 is placed in the card slot to install the first light shielding plate 105, and the end edge of the second light shielding plate 106 is placed in the card slot to install the second light shielding plate 106.

[0048] In some embodiments, the light source detection system may further include: a detection device fixture 109 for mounting the detection device 104. The detection device fixture 109 may include a three-axis rotation mechanism and / or an up-down translation mechanism and / or a left-right translation mechanism, so that the detection device 104 can be subjected to three-axis rotation adjustment and / or up-down translation adjustment and / or left-right translation adjustment. The detection device fixture 109 may also be referred to as a detection device fixture. As shown in the figure, the detection device fixture 109 is disposed below the detection device 104 and connected to the lower end of the detection device 104.

[0049] In some embodiments, the box 101 is a closed box, and at least one detachable baffle 110 is provided on the side wall of the box 101, so that when the baffle 110 is removed, an operation port is formed on the side wall of the box 101. When the baffle 110 is removed, an operation port is formed on the side wall of the box 101, and the user can operate various components in the box 101 through the operation port. When using this system to detect light sources, the operation port needs to be blocked by the baffle 110 to prevent external light from interfering with the test light path during the test. For example, Figure 5 As shown, a detachable baffle 110 may be provided on the top of the housing 101. The housing 101 may be considered as a detection chassis of the system.

[0050] In some embodiments, at least one through hole is provided on the side wall of the box 101 near one end of the detection device 104, so that the cable to be connected to the detection device 104 can extend into the box 101 through the through hole, and the cable can be but not limited to a network cable or a power cable. In this embodiment, the structure of the detection device 104 is not limited, and can be but not limited to a brightness meter, a colorimeter or a camera. In some embodiments, the lens fixing member 107 can be provided with at least one through hole, so that the cable connected to the lens 102 can extend through the through hole on the lens fixing member 107, for example, the cable connected to the lens 102 can be a lens control line.

[0051] The light source detection system may further include: a main control device, which is connected to the lens 102 and the detection device 104 respectively. The signal input end of the lens 102 is connected to the output end of the main control device. In the embodiment where the lens 102 is a zoom lens, the zoom lens can be controlled by the main control device to control the light source performance test. The signal output end of the detection device 104 is connected to the main control device, and can be specifically connected to the network port of the main control device. The main control device can be a main control machine.

[0052] For reference Figure 6 , Figure 6 A flow chart of a method for performing light source detection using the light source detection system provided in this embodiment is shown in the figure. The method for performing light source detection using the light source detection system described in any of the above embodiments includes the following steps:

[0053] S11: The outgoing light of the light source to be tested is incident on the lens 102 of the light source detection system, so that the outgoing light of the light source to be tested is incident on the lens 102, passes through the lens 102, enters the box 101 and further incident on the transmission film 103;

[0054] S12: enabling the detection device 104 to acquire the transmitted light of the transmissive film 103 and generate an image;

[0055] S13: Analyze the image to obtain a detection result of the detected light source.

[0056] The outgoing light of the light source to be tested enters the box 101 through the lens 102, and can be imaged on the transparent film 103 when incident on the transparent film 103. The light can pass through the transparent film 103, so that the detection device 104 obtains the transmitted light of the transparent film 103 and generates an image, so as to obtain the detection result of the light source to be tested based on the image.

[0057] Compared with the prior art which uses diffuse reflection plates and requires oblique shooting of detection equipment to obtain a screen image, the light source detection method of this embodiment enables the outgoing light of the light source to be detected to be incident on the lens and enter the box after passing through the lens. The light entering the box from the lens is further incident on the transmissive film and imaged on the transmissive film. The transmitted light of the transmissive film can be obtained by the detection device to generate an image, which can avoid introducing trapezoidal distortion, facilitate clear imaging of the entire projected picture, and help improve detection accuracy.

[0058] In some embodiments, the lens 102 is a zoom lens; making the outgoing light of the light source to be tested incident on the lens 102 of the light source detection system, so that the outgoing light of the light source to be tested is incident on the lens 102, passes through the lens 102, enters the box 101 and is further incident on the transmissive film 103 includes: adjusting the focal length of the lens 102, so that the outgoing light of the light source to be tested is incident on the lens 102, passes through the lens 102, enters the box 101 and is incident on the transmissive film 103, and forms a clear image on the transmissive film 103. Since the positions of the detection device 104 and the transmissive film 103 are fixed, it can be judged whether the outgoing light of the light source to be tested is clearly formed on the transmissive film 103 according to the image obtained by the detection device 104. In practical applications, it can be automatically judged whether the image is clear according to the image obtained by the detection device 104, such as calculating the MTF (sharpness) of the image for feedback, or the user can observe the boundary of the picture for judgment.

[0059] In a specific example, the light source detection method specifically includes the following steps:

[0060] Step 1: Adjust the focal length of the zoom lens to make the image of the test vehicle light clear on the transmission film.

[0061] Step 2: Control the high and low beam switching of the headlights or switch the projection card of the headlights through the main control device.

[0062] Step 3: Obtain the transmitted light of the transmissive film through the detection device and generate an image.

[0063] Step 4: Calculate the relevant detection data of the headlights according to the image information obtained by the detection device and return to the main control device interface.

[0064] The image generated by the detection device 104 is an image of the screen projected after the outgoing light of the detected light source passes through the projection chart card. In some embodiments, the detection data includes distortion data, and the detection data may include horizontal distortion rate / vertical distortion rate, calculated according to the following formula: Dtv=|(Hs-Hr)| / Hs*100%, for the horizontal distortion rate, Hs represents the distortion-free width, Hr represents the detection point width, for the vertical distortion rate, Hs represents the distortion-free height, Hr represents the detection point height, and Dtv represents the distortion rate. Or / and, the detection data includes trapezoidal distortion / prismatic distortion, calculated according to the following formula: D=2*|(ab)| / (a+b), a and b represent the waist and bottom of the distorted trapezoid, respectively, or a and b represent the diagonal of the prismatic distortion, respectively.

[0065] In some embodiments, the detection data includes brightness uniformity data, and the detection data may include: minimum / average, minimum / maximum, (maximum-minimum) / maximum, average / center, edge or center. Wherein, maximum and minimum represent the maximum value and minimum value of the detection point respectively, edge represents the edge detection value, center represents the center detection value, and average represents the average value of all detection points.

[0066] In some embodiments, the detection data includes contrast data, which can be calculated according to the following formula: contrast=white screen brightness / black screen brightness. For checkerboard detection, contrast=white area brightness / black area brightness.

[0067] In some embodiments, the detection data may include chromaticity data, including detection point color coordinates, detection point color temperature, color coordinate mean, color temperature mean, and color difference, the color coordinate mean is the color coordinate mean of all detection points, the color temperature mean is the color temperature mean of all detection points, and the color difference may be calculated using the following CIE color difference formula: △E = [(△L*)^2 + (△a*)^2 + (△b*)^2]^0.5. In actual applications, due to different requirements, the color difference calculation formula may be different.

[0068] In some embodiments, the detection data may include clarity data of the light source projection image, including: the detection point spatial frequency response (SFR) horizontal average, the detection point spatial frequency response (SFR) vertical mean and the total mean, the detection point SFR horizontal average is the upper and lower edge detection value mean for the inclined rectangle, the detection point SFR vertical mean is the left and right edge detection value mean for the inclined rectangle, and the total mean is the four-edge mean. The projection image of the detected light source includes a figure with an inclined edge, and the image is analyzed accordingly to obtain the detection result of the detected light source, including: identifying each edge of the figure in the image, calculating the mean of the upper edge detection value and the lower edge detection value according to the upper and lower edge of the figure, obtaining the detection point spatial frequency response (SFR) horizontal average, calculating the mean of the left detection value and the right detection value according to the left and right edge of the figure, and obtaining the detection point spatial frequency response (SFR) vertical mean. In this method, the software can automatically capture the edge of the measured image for calculation. The projection image is not necessarily a rectangle, and the inclined edge shape can be identified. After the edge area is identified, the SFR is calculated. The calculation method can adopt the SFR calculation method in ISD12233.

[0069] In some embodiments, the detection data may include enhanced low beam detection data, including enhanced low beam detection point brightness value. Analyzing the image to obtain the detection result of the detected light source includes: identifying a grab point area in the image, and taking the average brightness of the detection points in the area. In some embodiments, the detection data may include enhanced high beam detection data, including enhanced high beam detection point brightness value.

[0070] In some embodiments, the detection data may include the stray light data outside the field of view of the projection image, and may specifically include the maximum brightness outside the field of view. The detection range is different for different customer requirements, and there are the following situations: the first situation is to identify the field of view range based on the white chart, and when detecting stray light, the default range is to detect the range outside this area; the second situation is that the customer customizes the detection area for detection, and the area is also outside the field of view.

[0071] In some embodiments, the detection content may also include a 50m-200m oncoming vehicle test of the projected light source, and the relevant data obtained include: the brightness value of the detection point, and the total mean. The detection content may also include a 50m-200m right front vehicle test of the projected light source, and the relevant data obtained include: the brightness value of the detection point. The detection content may also include a 50m front vehicle test of the projected light source, and the relevant data obtained include: the brightness value of the detection point.

[0072] The detection content may also include the white leakage edge of the projected image of the light source being tested, and the relevant data obtained include: the ratio of the brightness of the four ends to the brightness of the center. The brightness of the four ends is the average brightness of the pixels in a small area, and the brightness of the center is the average brightness of the pixels in a small area, such as a 3*3 pixel rectangular area.

[0073] The test content may also include the stray light test of the III zone outside the field of view of the projected image of the tested light source, and the relevant data obtained include: the brightness value of the test point. The test content may also include the stray light test of the fixed area outside the field of view of the projected image of the tested light source, and the relevant data obtained include: the brightness value of the test area. The test content may also include the high beam ADB of the projected image of the tested light source, and the relevant data obtained include: the brightness value of the test point.

[0074] The detection content may also include the gradient of the cutoff line of the projected image of the light source to be tested, and the relevant data obtained include: the gradient of the cutoff line of the detection viewing angle. According to customer requirements, the brightness gradient within the preset angle range of the cutoff line is detected and identified. The preset angle is the detection viewing angle, which can be calculated according to the following formula: D=(Lb-Ld) / (Lb+Ld), Lb represents the brightness of the area where the cutoff line is close to the light source to be tested, and Ld represents the brightness of the area where the cutoff line is close to the dark area. The preset angle is 2.5° for example.

[0075] This light source detection system can be applied to automotive DLP projection headlight detection, and can be used in R&D laboratories or supporting factory automotive headlight testing, especially for automotive headlight lighting quality testing. It can be used for traditional headlight cut-off line, anti-glare point, high and low beam brightness, stray light, brightness and other tests, as well as projection headlight brightness, uniformity, color difference, distortion, SFR and other tests. It has a simple structure, is easy to operate, has a fast test speed and high accuracy.

[0076] This light source detection system adopts a test chassis design to achieve accurate measurement of various headlight test items of automobiles, solves the distortion and depth of field influence caused by the shooting method, changes the test distance, and can achieve rapid measurement of the production line, saving time and space costs.

[0077] The above is a detailed introduction to a light source detection system provided by the utility model. This article uses specific examples to illustrate the principle and implementation method of the utility model. The description of the above embodiment is only used to help understand the method and core idea of ​​the utility model. It should be pointed out that for ordinary technicians in this technical field, without departing from the principle of the utility model, the utility model can also be improved and modified, and these improvements and modifications also fall within the scope of protection of the claims of the utility model.

Claims

1. A light source detection system, characterized in that: include: Box; A lens is arranged at one end of the box body, so that the outgoing light of the light source to be tested is incident on the lens and enters the box body after passing through the lens; A transmissive film and a detection device are both arranged in the box, and the transmissive film is arranged on the optical path between the lens and the detection device, so that the light entering the box through the lens is imaged on the transmissive film. The detection device is used to obtain the transmitted light of the transmissive film and generate an image, so as to obtain the detection result of the light source to be detected based on the image.

2. The light source detection system according to claim 1, characterized in that: The lens is a zoom lens.

3. The light source detection system according to claim 1, characterized in that: Also includes: A lens fixing member is arranged on the box body, and is used to fix the lens so that the lens extends out of the box body.

4. The light source detection system according to claim 3, characterized in that: The lens fixing member may be provided with at least one through hole, so that a cable connected to the lens extends out through the through hole on the lens fixing member.

5. The light source detection system according to claim 1, characterized in that: Also includes: The first light shielding plate and the second light shielding plate are both arranged in the box body, and the first light shielding plate is arranged on the optical path between the lens and the transmissive film to block the stray light in the light entering the box body from the lens, and the second light shielding plate is arranged on the optical path between the transmissive film and the detection device to block the stray light in the transmitted light of the transmissive film.

6. The light source detection system according to claim 5, characterized in that: The aperture of the first light shielding plate satisfies: 4L*tan(θ / 2)>D>8 / 3*L*tan(θ / 2), D represents the aperture of the first light shielding plate, L represents the distance from the first light shielding plate to the lens, θ represents the field of view angle of the light source to be tested, and the aperture of the second light shielding plate is consistent with the aperture of the first light shielding plate.

7. The light source detection system according to claim 1, characterized in that: Also includes: The transmissive film fixing part is used for installing the transmissive film. A slide rail is arranged on the box body, and the transmissive film fixing part can move along the slide rail.

8. The light source detection system according to claim 1, characterized in that: Also includes: The detection device fixing part is used for installing the detection device, and the detection device fixing part includes a three-axis rotation mechanism and / or an up-down translation mechanism and / or a left-right translation mechanism.

9. The light source detection system according to claim 1, characterized in that: The box body is a closed box body, and at least one detachable baffle is arranged on the side wall of the box body, so that an operation opening is formed on the side wall of the box body when the baffle is removed.

10. The light source detection system according to claim 1, characterized in that: At least one through hole is provided on a side wall of the box body close to one end of the detection device, so that a cable to be connected to the detection device extends into the box body through the through hole.

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