Windshield glass detection device
By designing a windshield glass detection device including a camera detection unit and a projection emission unit, using the emission control module and a calculation module, the problem of high detection cost and long cycle of the stroke windshield glass is solved in the prior art, and a fast and accurate detection effect is achieved.
Patent Information
- Application Number
- CN202311500646.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2023-11-08
- Publication Date
- 2025-05-09
AI Technical Summary
When detecting the surface type of the windshield glass, the prior art needs to manufacture a standard head-up display that matches the windshield glass model. It is expensive, difficult to manufacture, long detection cycle, or use a three-coordinate measurement device, which is long and has high equipment cost.
A windshield glass detection device is designed, including a camera detection unit and a projection emission unit. The attitude of the mirror array is adjusted through the emission control module, so that the test light exits to the windshield glass to be tested at different angles, and the calculation module is used to obtain the optical quality of the windshield glass based on the test light received by the camera.
It realizes fast and accurate detection of different models of windshield glass, has good versatility, avoids the impact of manufacturing errors of head-up displays, and reduces equipment costs.
Smart Images
Figure CN119958450A_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to the technical field of head-up display, and in particular to a windshield detection device. Background Art
[0002] Head Up Display (HUD), also known as Head Up Display, is abbreviated as HUD. Its principle is to project important driving information such as speed and navigation on a suitable position of the windshield through a designed optical path for the driver to view, avoiding the driver looking down at the display information of the instrument or other driving assistance equipment, which may cause safety hazards. The surface shape of the windshield is usually a complex free-form surface, and its surface shape has a great influence on the image quality of the head-up display. Therefore, the detection of the windshield surface shape is very important.
[0003] In the prior art, when testing the surface shape of a windshield, it is usually necessary to manufacture a standard head-up display that matches the windshield model, and indirectly determine whether the surface shape of the windshield meets the use requirements by measuring the distortion of the virtual image produced by the head-up display projected on the windshield to be tested. For different car models, due to the different windshield models, it is necessary to manufacture standard head-up displays that match the windshield to be tested separately during testing, which is costly, difficult to manufacture, and has a long testing cycle. Alternatively, a three-coordinate measuring device can be used, with a probe in contact with each point on the surface of the windshield, and the coordinates of each point can be measured to obtain the surface shape of the windshield. However, this method is time-consuming, and the high-precision three-coordinate measuring equipment is expensive.
[0004] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention
[0005] The purpose of the present disclosure is to provide a windshield glass detection device, which can test windshield glasses of different models.
[0006] The windshield glass detection device includes a camera detection unit and a projection emission unit, the projection emission unit includes a light source, a reflector array and an emission control module; the camera detection unit includes a camera and a computing module, and the reflector array includes a plurality of deflection reflectors arranged in an array;
[0007] Among them, the light source is used to emit test light, the reflector array is used to adjust the postures of multiple deflection reflectors under the control of the emission control module, so that the test light is reflected by the deflection reflectors and the windshield to be tested in turn and enters the camera, and the calculation module is used to obtain the optical quality of the windshield to be tested according to the test light received by the camera.
[0008] In an exemplary embodiment of the present disclosure, the calculation module is used to obtain the position and normal direction of any point of the windshield to be tested according to the test light received by the camera.
[0009] In an exemplary embodiment of the present disclosure, the test light includes multiple sub-beams, and each sub-beam corresponds to a deflection reflector one by one, so that each sub-beam is reflected by the deflection reflector opposite to the sub-beam and the windshield to be tested in turn and enters the camera.
[0010] In an exemplary embodiment of the present disclosure, the deflecting reflector is used to allow the sub-beam to be reflected by the deflecting reflector and then emitted from the deflecting reflector to the windshield to be measured as parallel light.
[0011] In an exemplary embodiment of the present disclosure, the sub-beams are parallel lights.
[0012] In an exemplary embodiment of the present disclosure, the sub-beams are emitted divergently from the light source toward the reflector array, and the reflective surface of the deflection reflector is a parabola.
[0013] In an exemplary embodiment of the present disclosure, the sub-beam emitted by the projection emission unit is divergent light.
[0014] In an exemplary embodiment of the present disclosure, the light source includes a plurality of arrays of sub-light sources, each of which is used to emit a sub-light beam in a one-to-one correspondence.
[0015] In an exemplary embodiment of the present disclosure, the projection emission unit also includes a focusing module, which is arranged between the light source and the reflector array. The focusing module includes at least one focusing lens for changing the optical path of the test light from the light source to the reflector array.
[0016] In an exemplary embodiment of the present disclosure, the reflector array includes N deflection reflectors arranged in an array, and the reflector array is used to adjust the postures of the M deflection reflectors under the control of the emission control module so that the test light passing through the M deflection reflectors cannot enter the camera; the reflector array is used to adjust the postures of the P deflection reflectors under the control of the emission control module so that the test light passing through the P deflection reflectors enters the camera after being reflected by the windshield to be tested; wherein M is less than N, P is not greater than N, and M+P is not greater than N.
[0017] In an exemplary embodiment of the present disclosure, the deflecting reflector includes a reflective lens and a driving mechanism, the driving mechanism is used to drive the reflective lens to deflect in a first direction, and the driving mechanism is also used to drive the reflective lens to deflect in a second direction, wherein the first direction is perpendicular to the second direction, and the first direction is perpendicular to the main optical axis of the reflective lens, and the second direction is perpendicular to the main optical axis of the reflective lens.
[0018] In an exemplary embodiment of the present disclosure, a target is provided between the light source and the reflector array, a light through hole is provided on the target, and the test light enters the reflector array from the light through hole;
[0019] When any sub-beam passing through the light hole enters the camera, a sub-image corresponding to the shape of the light hole is formed on the photosensitive plane of the camera.
[0020] The windshield detection device disclosed in the present invention can adjust the posture of each deflection reflector in the reflector array through the emission control module, so that the test light is emitted to the test position of the windshield to be tested at a required angle. Since the postures of multiple deflection reflectors can be adjusted separately, when facing different types of windshields to be tested, the emission control module can control each deflection reflector to have different deflection directions and deflection angles, so that the test light is emitted to the test position of the windshield to be tested at different angles. Therefore, the windshield detection device disclosed in the present invention can test different types of windshields and has good versatility. Moreover, for the reflector array composed of multiple deflection reflectors, the tolerance of each deflection reflector is independent of each other, so it is easier to control, detect and correct, thereby avoiding the introduction of errors of various components in the head-up display into the measurement results of the windshield to be tested. In addition, since the angle and position of the test light projected onto the windshield to be tested can be controlled by the emission control module, the positions of the reflector array and the windshield can be fixed without the need for re-matching and adjustment each time the windshield to be tested is replaced. BRIEF DESCRIPTION OF THE DRAWINGS
[0021] The accompanying drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the specification are used to explain the principles of the present disclosure. Obviously, the accompanying drawings described below are only some embodiments of the present disclosure, and for ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.
[0022] In order to better understand the present disclosure, reference may be made to the embodiments shown in the following drawings. The components in the drawings are not necessarily to scale, and related elements may be omitted in order to emphasize and clearly illustrate the technical features of the present disclosure. In addition, related elements or components may have different arrangements as known in the art. In addition, in the drawings, the same reference numerals represent the same or similar components in each drawing. Among them:
[0023] Figure 1 is a schematic diagram of an exemplary embodiment of a windshield glass detection device disclosed in the present invention;
[0024] Figure 2A schematic diagram of a projection emission unit of an exemplary embodiment of a windshield glass detection device disclosed in the present invention;
[0025] Figure 3 A schematic diagram of a projection emission unit of an exemplary embodiment of a windshield glass detection device disclosed in the present invention;
[0026] Figure 4 is a schematic diagram of a test image of an exemplary embodiment of a windshield inspection device disclosed herein;
[0027] Figure 5 is a schematic diagram of a target and a focusing module of an exemplary embodiment of a windshield inspection device disclosed herein;
[0028] Figure 6 is a schematic diagram of a test image of an exemplary embodiment of a windshield inspection device disclosed herein;
[0029] Figure 7 A schematic diagram of a projection emission unit of an exemplary embodiment of a windshield glass detection device disclosed herein;
[0030] Figure 8 A schematic diagram of a test area of an exemplary embodiment of a windshield glass detection device disclosed herein;
[0031] Fig. 9 is a schematic diagram of a focusing module of an exemplary embodiment of a windshield glass detection device disclosed in the present invention;
[0032] Fig.10 is a schematic diagram of a focusing module of an exemplary embodiment of a windshield glass detection device disclosed herein;
[0033] Fig.11 A schematic diagram of a deflecting reflector of an exemplary embodiment of a windshield glass detection device disclosed herein;
[0034] Fig.12 It is a schematic diagram of solving the geometric relationship of the reflection point Q of the ith sub-beam on the windshield to be tested in an exemplary embodiment of the windshield detection device disclosed in the present invention.
[0035] The following are the descriptions of the reference numerals:
[0036] 10. Projection emission unit; 1. Light source; 2. Reflector array; 21. Deflection reflector; 3. Windshield; 31. Area to be measured; 4. Camera; 5. Target; 6. Test image; 60. Sub-image; 61. Actual image point; 62. Theoretical image point; 7. Eye box; 8. Focus module; 81. Focus lens. DETAILED DESCRIPTION
[0037] The following will be combined with the accompanying drawings in the exemplary embodiments of the present disclosure to clearly and completely describe the technical solutions in the exemplary embodiments of the present disclosure. The exemplary embodiments described herein are only for illustrative purposes and are not intended to limit the scope of protection of the present disclosure. Therefore, it should be understood that various modifications and changes can be made to the exemplary embodiments without departing from the scope of protection of the present disclosure.
[0038] Unless otherwise specified or explained, the technical terms or scientific terms used in this disclosure shall have the usual meanings understood by people with ordinary skills in the field to which this disclosure belongs. The use of "first" and "second" in this disclosure is only used as a mark, not to limit the quantity, importance or order of its objects. "Include" or "comprising" and similar words mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects.
[0039] The present disclosure provides a windshield glass inspection device, including a camera inspection unit and a projection and emission unit 10. The projection and emission unit 10 includes a light source 1, a reflector array 2 and an emission control module; the camera inspection unit includes a camera 4 and a calculation module, and the reflector array 2 includes a plurality of deflection reflectors 21 arranged in an array. Among them, the light source 1 is used to emit test light, and the reflector array 2 is used to adjust the postures of the plurality of deflection reflectors 21 under the control of the emission control module, so that the test light is reflected by the deflection reflectors 21 and the windshield glass 3 to be tested in turn, and enters the camera 4, and the calculation module is used to obtain the optical quality of the windshield glass 3 to be tested according to the test light received by the camera 4.
[0040] refer to Figure 1 As shown, when the windshield glass detection device of the present disclosure is used to detect the windshield glass 3, the light source 1 emits a test light to the reflector array 2, which is reflected by the reflector array 2 and projected to the windshield glass 3, reflected by the windshield glass 3, enters the camera 4, and can form a test image 6 on the photosensitive plane of the camera 4. The received test image 6 is processed by the calculation module to obtain the optical quality of the windshield glass 3 to be tested. For example, the calculation module can calculate the surface shape of the windshield glass 3 to be tested to characterize the optical quality of the windshield glass 3 to be tested; or calculate the optical quality parameters of the windshield glass 3 to be tested, such as distortion parameters, tilt angle, ghost distance, etc., according to the virtual image formed by the windshield glass 3 to be tested, to characterize the optical quality of the windshield glass 3 to be tested.
[0041] In the prior art, when testing the windshield 3 surface type, it is necessary to manufacture a standard head-up display that matches the windshield 3 model. The optical system of the head-up display is usually composed of a projection light machine and at least one reflector. In actual use, the projection light machine is used to emit a real image corresponding to the virtual image to be projected, and the reflector is used to turn and adjust the image emitted by the projection light machine and guide it to the inner side of the windshield 3; during testing, the projection light machine emits a characteristic UI image for testing, and the reflector is used to turn and adjust the image emitted by the projection light machine and guide it to the corresponding position to be tested on the inner side of the windshield 3 to be tested. However, the optical system of the head-up display is usually an off-axis system, and the reflector inside the head-up display usually includes at least one free-form surface reflector. When testing the windshield 3 surface type, it is easily affected by the manufacturing and assembly errors of various components in the head-up display, such as the assembly error of the projection light machine, the manufacturing and assembly error of the reflector, etc., which leads to inaccurate test results for the windshield 3 surface type.
[0042] Moreover, for different car models, the windshield 3 has different models, and the optical system of the head-up display matched therewith is also different, that is, the corresponding head-up display is different, and the relative position of the head-up display and the windshield 3 is also different. Therefore, when testing the windshield 3 of each car model, a standard head-up display needs to be re-manufactured, and the windshield 3 to be tested and the standard head-up display for testing need to be installed according to the relative position of the head-up display and the windshield 3 of the car model before the test can be carried out.
[0043] The windshield glass detection device disclosed in the present invention can adjust the posture of each deflection reflector 21 in the reflector array 2 through the emission control module, so that the test light is emitted to the test position of the windshield glass 3 to be tested at a required angle. Since the postures of multiple deflection reflectors 21 can be adjusted separately, when facing different types of windshield glasses 3 to be tested, the emission control module can control each deflection reflector 21 to have different deflection directions and deflection angles, so that the test light is emitted to the test position of the windshield glass 3 to be tested at different angles. Therefore, the windshield glass detection device disclosed in the present invention can test different types of windshield glasses 3 and has good versatility. Moreover, for the reflector array 2 composed of multiple deflection reflectors 21, the tolerances of each deflection reflector 21 are independent of each other, so it is easier to control, detect and correct, thereby avoiding the introduction of errors of various components in the head-up display into the measurement results of the windshield glass 3 to be tested. In addition, since the angle and position of the test light projected onto the windshield 3 to be tested can be controlled by the emission control module, the positions of the reflector array 2 and the windshield 3 can be fixed without the need for re-matching and adjustment each time the windshield 3 to be tested is replaced.
[0044] In an exemplary embodiment of the present disclosure, reference Figure 1 As shown, during the test, the windshield 3 to be tested can be fixed on the test bench. For example, the windshield 3 to be tested can be fixed on the test bench at specific horizontal and vertical inclination angles based on the positioning method of the windshield 3 when it is installed on the vehicle.
[0045] The reflector array 2 includes a plurality of deflection reflectors 21 arranged in an array. Figure 2 As shown, in an exemplary embodiment of the present disclosure, the reflector array 2 includes N deflection reflectors 21 arranged in an array. The emission control module can independently control and adjust the posture of each deflection reflector 21. For example, the emission control module can accurately adjust the deflection direction and deflection angle of each deflection reflector 21. Therefore, after the test light emitted by the light source 1 is reflected by the deflection reflector 21, its emission direction can be adjusted. Specifically, the test light includes a plurality of sub-beams, and a sub-beam corresponds to a deflection reflector 21, so that the sub-beam passes through the corresponding deflection reflector 21 and the windshield 3 to be tested in sequence and enters the camera 4, and the direction of each sub-beam when it is emitted from the deflection reflector 21 corresponding to the sub-beam can be adjusted independently.
[0046] In an exemplary embodiment of the present disclosure, the light source 1 may be a bulb light source, a laser light source, or an LED light source, etc., as long as it can emit test light that meets the brightness and uniformity requirements. Figure 2 and Figure 3 As shown, the deflection reflector 21 is used to make each sub-beam be reflected by the deflection reflector 21 and then emitted from the deflection reflector 21 in the form of parallel light. Therefore, the sub-beams reflected by the deflection reflector 21 are incident on the windshield 3 to be tested in parallel, enter the camera 4 after being reflected by the windshield 3 to be tested, and form a test image 6 on the photosensitive plane of the camera 4. For each sub-beam corresponding to the deflection reflector 21, a sub-image 60 is formed on the photosensitive plane of the camera 4. Since the reflectors of the reflector array 2 are separated from each other, the sub-images 60 in each test image 6 are also separated from each other. That is, the test image 6 includes a plurality of sub-images 60 arranged in an array.
[0047] In an exemplary embodiment of the present disclosure, reference Fig. 9 and Fig.10 As shown, the deflection reflector 21 is used to make each sub-beam be reflected by the deflection reflector 21, and then emitted from the deflection reflector 21 in the form of divergent light, and enter the windshield glass 3 to be measured. After being reflected by the windshield glass 3 to be measured, each sub-beam enters the camera 4, and for each sub-beam corresponding to the deflection reflector 21, a sub-image 60 is formed on the photosensitive plane of the camera 4. For example, for each sub-beam emitted from the polarization reflector, it can be equivalent to being emitted from a point light source at a distance L1 from the polarization reflector, referring to Fig. 9 and Fig.10 As shown, the magnification of the windshield 3 to be tested is S. When the windshield 3 to be tested is actually used, the distance from the virtual image point to the windshield 3 to be tested is L2 = L1*S, and the distance from the observer's eye point to the windshield 3 to be tested is L3. Then the distance from the observer's eye point to the virtual image to be tested is L = L1*S+L3. For each polarizing reflector i, its corresponding projection distance L1 i =(L-L3 i ) / S i , where L, L3 i , S i It can be obtained according to the theoretical design value of the vehicle model corresponding to the windshield 3 to be tested. By adjusting the surface shape of each deflection reflector 21, the equivalent projection distance L1 can be changed, so that the virtual image distance L during the test is consistent with the virtual image distance when the windshield 3 to be tested is actually used for the head-up display. The measured optical quality parameters and imaging effects can be used to predict the effect of the actual head-up display, and directly determine whether the windshield 3 to be tested is qualified when actually used.
[0048] For example, reference Figure 4 As shown, any sub-beam forms a point image on the photosensitive plane of the camera 4, and the test image 6 is presented as a dot pattern. Figure 5 As shown, a target 5 is provided between the light source 1 and the reflector array 2, and a light hole is provided on the target 5 for passing the test light. The test light enters the reflector array 2 from the light hole, and when any sub-beam passing through the light hole enters the camera 4, a sub-image 60 corresponding to the shape of the light hole is formed on the photosensitive plane of the camera 4. Specifically, the target 5 can be set at the position where the test light is emitted from the light source 1, or can be set at a position with a certain distance from the light source 1. The test light enters the reflector array 2 through the light hole. For each sub-beam passing through the light hole and forming an image in the camera 4, the light hole is equivalent to the object plane of the sub-beam, which is reflected and formed by the corresponding deflection mirror, and a sub-image 60 is formed through the camera 4. The shape of the sub-image 60 is consistent with the shape of the light hole.
[0049] For example, if the shape of the light hole is circular, each sub-beam passing through the light hole and entering the camera 4 for imaging forms a point-shaped sub-image 60 in the camera 4. The test image 6 is shown as follows, for example: Figure 4 For another example, if the shape of the light hole is a cross, each sub-beam that passes through the light hole and enters the camera 4 for imaging forms a cross-shaped sub-image 60 in the camera 4. The test image 6 is shown as follows, for example: Figure 6In other exemplary embodiments, the light holes may also be in the shape of a triangle, a square, a slit, a semicircle, or a four-bar shape. By setting light holes of different shapes, the test image 6 can be represented as arrays of different shapes, so that different operation algorithms can be used for the test image 6 to calculate different optical quality parameters of the windshield glass 3 to be tested.
[0050] For example, in an exemplary embodiment, the light hole is a circular hole, the test image 6 is represented as a dot matrix, and the center point of each dot-shaped sub-image 60 represents the position of the image point. The magnitude of the distortion can be measured by calculating the distance of each actual image point 61 from the theoretical image point 62. Other forms of optical quality parameters can also be calculated, such as reference Figure 4 As shown, the angle of the horizontal reference line formed by each row of actual image points 61 and the theoretical image points 62 is used as the horizontal tilt angle of the windshield glass 3 to be tested; the angle of the vertical reference line formed by each column of actual image points 61 and the theoretical image points 62 is used as the vertical tilt angle of the windshield glass 3 to be tested; the ratio of the length of the horizontal line formed by each row of actual image points 61 to the length of the horizontal reference line formed by the theoretical image points 62 is used as the image scaling ratio of the windshield glass 3 to be tested. The optical quality of the windshield glass 3 to be tested can be measured and controlled by the horizontal tilt angle, vertical tilt angle and image scaling ratio of the windshield glass 3 to be tested.
[0051] For example, in an exemplary embodiment, the light aperture is in the shape of a slit, and the test image 6 is presented as an array of straight lines. The image scaling ratio can be calculated by comparing the length of the actual line with the theoretical line length. For another example, the light aperture is in the shape of a square or a cross, and the test image 6 is presented as an array of squares or crosses. The optical quality at different positions on the surface of the windshield 3 to be tested can be measured by analyzing the deformation of each sub-image 60 of the image 6 and calculating the distortion size.
[0052] In the exemplary embodiment of the present disclosure, since the deflection mirrors 21 are separated from each other and the postures of the deflection mirrors 21 can be independently controlled, the sub-images 60 are separated from each other, and the object plane of each sub-image 60 is the light emitting surface of the light source 1 or the object plane formed by the light source 1 passing through the target 5. Compared with the method of directly projecting through the head-up display or the projection light machine of the head-up display, since the test image 6 finally presented is a complete image, it is realized by the UI image, so it is necessary to separately produce the UI image required for the test before the test, which is more cumbersome.
[0053] In an exemplary embodiment of the present disclosure, reference Figure 7As shown, for example, the test light emitted by the light source 1 is parallel light, and each sub-beam is parallel light. Each deflection reflector 21 can be a plane mirror, which does not magnify or reduce the parallel light, but is only used to deflect the direction of the light. This can reduce the difficulty of controlling the surface shape of each deflection reflector 21. Parallel light is equivalent to an infinitely far object plane, so there is no need to control the distance accuracy between the deflection reflector 21 and the light source 1.
[0054] In an exemplary embodiment of the present disclosure, reference Figure 3 As shown, the sub-beams are emitted divergently from the light source 1 to the reflector array 2, and the reflective surface of the deflection reflector 21 is a parabola. The surface shape of any deflection reflector 21 matches the distance from the deflection reflector 21 to the light source 1 or the target 5, so that each sub-beam is emitted from the deflection reflector 21 in the form of parallel light.
[0055] In an exemplary embodiment of the present disclosure, the test light emitted by the light source 1 is parallel light, and each deflection reflector 21 is a curved mirror, so that each sub-beam is reflected by the deflection reflector 21 and then emitted from the deflection reflector 21 in the form of divergent light. Alternatively, the test light emitted by the light source 1 is divergent light, and each deflection reflector 21 is a curved mirror, so as to adjust the divergence angle of each sub-beam emitted to the windshield glass 3 to be tested.
[0056] In an exemplary embodiment of the present disclosure, the light source 1 includes a plurality of arrays of sub-light sources, each of which is used to emit a sub-beam in one-to-one correspondence. That is, each sub-light source corresponds to each deflection reflector 21, and each deflection reflector 21 is used to reflect a sub-beam emitted by a sub-light source. For example, the test light emitted by each sub-light source is parallel light, and the direction of the light emitted by each sub-light source is consistent, so that each sub-beam is parallel. For another example, each sub-light source is a point light source, and the test light emitted by each sub-light source is divergent light, and the surface shape of any deflection reflector 21 matches the distance from the deflection reflector 21 to the sub-light source corresponding thereto. In particular, when designing the light source 1 and the reflector array 2, after completing the matching design of any sub-light source and the corresponding deflection reflector 21, the sub-light source and the deflection reflector 21 can be modularly replicated as a group to form the required light source 1 and reflector array 2.
[0057] In addition, due to the different models of the windshield 3 to be tested, the size and position of the area to be tested 31 are also different. For example, for some augmented reality head-up displays, the projection area on the windshield 3 is larger, and the area to be tested 31 is also larger; for other head-up displays, such as ordinary windshield head-up displays with small diameters, the projection area on the windshield 3 is smaller, and the area to be tested 31 is also smaller.
[0058] In an exemplary embodiment of the present disclosure, the reflector array 2 may include N deflection reflectors 21, and the light source 1 may include N sub-light sources. When testing a windshield 3 to be tested with a larger test area 31, the sub-light beams emitted by the N sub-light sources can cover the larger test area 31 on the windshield 3 to be tested after being reflected by the N deflection reflectors 21, and the N sub-light beams all enter the camera 4; when testing a windshield 3 to be tested with a smaller test area 31, the M sub-light sources can be turned off, so that only the sub-light beams emitted by the NM sub-light sources are reflected by the NM deflection reflectors 21 corresponding thereto, and enter the windshield 3 to be tested, and the NM sub-light beams can cover the smaller test area 31 on the windshield 3 to be tested, and enter the camera 4 after being reflected by the windshield 3 to be tested. It can be seen that the windshield detection device of the exemplary embodiment of the present disclosure can adaptively change the number of sub-light sources that are turned on according to different areas 31 to be tested, and the emission control module can only adjust the posture of the deflection reflector 21 corresponding to the turned-on sub-light sources, and the calculation module only needs to analyze the image formed by the turned-on sub-light sources, thereby reducing the required computing power.
[0059] In an exemplary embodiment of the present disclosure, when testing a windshield 3 to be tested with a relatively small test area 31, the emission control module can control the postures of the M deflection reflectors 21 so that the test light passing through the M deflection reflectors 21 is deflected to a position where it cannot enter the camera 4. For example, the test light passing through the M deflection reflectors 21 is deflected to a position where it cannot enter the windshield 3 to be tested, or the test light passing through the M deflection reflectors 21 cannot enter the lens of the camera 4 after being reflected by the windshield 3 to be tested. The emission control module also adjusts the postures of the P deflection reflectors 21 so that the test light passing through the P deflection reflectors 21 can enter the camera 4 to form the corresponding P sub-images 60 after being reflected by the windshield 3 to be tested. It can be seen that the windshield detection device of the exemplary embodiment of the present disclosure can enable the emission control module to adjust the posture of a part of the deflection reflector 21 so that the corresponding sub-beam forms a sub-image 60, and adjust the posture of a part of the deflection reflector 21 so that the corresponding sub-beam cannot form a sub-image 60 according to the different areas to be tested 31, so that the calculation module only needs to analyze the sub-image 60 reflected from the area to be tested 31 and entering the camera 4, thereby reducing the required computing power.
[0060] In an exemplary embodiment of the present disclosure, when testing different test areas 31, the method of the above exemplary embodiment can also be used, for example, M1 sub-light sources are turned off, and the emission control module controls the postures of M2 deflection reflectors 21, so that the test light passing through the M2 deflection reflectors 21 is deflected to a position where it cannot enter the camera 4. The above M1 sub-light sources and M2 deflection reflectors 21 correspond to areas outside the test area 31 of the windshield 3 to be tested.
[0061] As shown in the reference figure, according to the position and size of the area to be tested 31, NM deflection mirrors 21 are selected for detection, where M is less than N. Figure 8 In the schematic diagram of the test area 31 on the windshield 3 shown, the wireframe area is the test area 31, and the sub-images 60 corresponding to the M deflection reflectors 21 in the reflector array 2 are outside the test area 31, then the sub-light sources corresponding to the M deflection reflectors 21 can be turned off, or the emission control module can control the M deflection reflectors 21 so that the corresponding test light is deflected and cannot enter the camera 4. Alternatively, the software algorithm in the calculation module can be used to process only the NM sub-images 60 in the test area 31 in the camera 4, and the M sub-images 60 outside the test area 31 are not processed.
[0062] In another exemplary embodiment of the present disclosure, the light source 1 may also be an integrated light source 1, and the object plane position corresponding to each deflection reflector 21 is the light source 1. For example, the light source 1 is a point light source, which is used to emit divergent test light to the reflector array 2, and the reverse extension lines of each sub-beam intersect at a point. The distances from each deflection reflector 21 to the light source 1 are different. Accordingly, the surface shape of each deflection reflector 21 matches the distance from the deflection reflector 21 to the light source 1, and the light reflected by each deflection reflector 21 is parallel light, or divergent light determined by the virtual image distance. In this exemplary embodiment, the above-mentioned method of making the emission control module control the posture of part of the deflection reflector 21 can be used to prevent part of the sub-beam from entering the camera 4, so that only the required sub-image 60 is formed in the camera 4.
[0063] In an exemplary embodiment of the present disclosure, referring to Figure 5 and Fig. 9As shown, the projection emission unit 10 also includes a focusing module 8, which is arranged between the light source 1 and the reflector array 2. The focusing module 8 includes at least one focusing lens 81, which is used to change the optical path of the test light from the light source 1 to the reflector array 2. Specifically, the focusing lens 81 can be a convex lens or a concave lens. The focusing module 8 can include a plurality of convex lens focusing lenses 81 and a plurality of concave lens focusing lenses 81. The focusing lens 81 can change the optical path of the test light from the light source 1 to the reflector array 2, so that the virtual image distance of the outgoing light of the reflector array is adjustable. For example, by adjusting the focal length of the focusing module 8, such as adjusting the position of one or more focusing lenses 81, the equivalent projection distance L1 can be changed, so that the virtual image distance L during the test is consistent with the virtual image distance when the windshield 3 to be tested is actually used for the head-up display. The measured optical quality parameters and imaging effects can be used to predict the effect of the actual head-up display, and directly determine whether the windshield 3 to be tested is qualified when actually used. For example, by adjusting the focal length of the focusing module 8, the deflection reflector 21 can be made to adopt a plane mirror. After each sub-beam is adjusted by the focusing module 8 to a divergence angle that meets the requirements, it is reflected by the deflection reflector 21 and divergently incident on the windshield glass 3 to be tested, and can be equivalent to being emitted from a point light source at a distance L1 from the polarization reflector. Fig. 9 and Fig.10 For example, by adjusting the focal length of the focusing module 8 , the divergent light emitted by the light source 1 can be converted into parallel light and incident on the deflection reflector 21 .
[0064] The posture of the deflection reflector 21 is controlled and adjusted by the emission control module. For example, the deflection reflector 21 includes a reflective lens and a driving mechanism. The driving mechanism is used to drive the reflective lens to deflect. In an exemplary embodiment of the present disclosure, the reflective lens has a relative reflective surface and a non-reflective surface. The reflective lens is fixed to the top of the galvanometer shaft through the non-reflective surface. When a weak current signal passes through, the alternating magnetic field generated by the energization of the working coil in the galvanometer interacts with the excitation magnetic field generated by the permanent magnet, causing the shaft to deflect, thereby driving the reflective lens to change its angle. Alternatively, the deflection reflector 21 is fixed on a bracket, the bracket is mounted on a two-dimensional shaft, and the motor drives the shaft to rotate, driving the deflection reflector 21 to deflect in angle.
[0065] In an exemplary embodiment of the present disclosure, the driving mechanism is used to drive the reflective lens to deflect in a first direction, and the driving mechanism is also used to drive the reflective lens to deflect in a second direction, wherein the first direction is perpendicular to the second direction, and the first direction is perpendicular to the principal optical axis of the reflective lens, and the second direction is perpendicular to the principal optical axis of the reflective lens. For example, the deflecting reflector 21 can be a tiny drivable reflector made based on micro-electromechanical system (MEMS) technology, and the driving method can be electrostatic drive, electromagnetic drive, piezoelectric drive or thermoelectric drive. For example, the driving mechanism includes a fixed electrode and a movable electrode. When a driving voltage is loaded between the fixed electrode and the movable electrode, the movable electrode moves toward the fixed electrode end under the action of the Coulomb force, and when the driving voltage disappears, the movable electrode returns to the equilibrium position, and the reflective lens can be driven by the vibration of the movable electrode.
[0066] Specifically, refer to Fig.11 As shown, the deflection direction of the reflective lens of the deflecting reflector 21 is shown. The X direction and the Y direction are the first direction and the second direction, respectively. In an exemplary embodiment of the present disclosure, the reflective lens may be circular, and in another exemplary embodiment, the reflective lens may be rectangular. It should be noted that the shape of the reflective lens described in the present disclosure is circular or rectangular, which does not mean that the reflective lens is a plane mirror. For example, when the reflective lens is a plane mirror, the reflecting surface may be circular or rectangular; when the reflective lens is a curved mirror, the shape of the reflective lens in the plane formed by the first direction and the second direction may be circular or rectangular.
[0067] For example, in an exemplary embodiment of the present disclosure, the reflective mirror is circular, and the spacing between the reflective mirrors is 30 mm. The overall area of the reflector array 2 is about 150 mm*150 mm, and the reflector array 2 includes 5 rows and 5 columns of deflection reflectors 21 with the same caliber, which can ensure that the test image 6 has 5*5 sub-images 60 available for calculation, so that the optical quality parameters of the windshield 3 calculated by the calculation module are more accurate. Or, for example, for some augmented reality head-up displays with larger packaging sizes, in an exemplary embodiment of the present disclosure, the spacing between the reflective mirrors can be 5 mm to 50 mm, and the reflector array 2 includes 5 rows and 5 columns of deflection reflectors 21. Specifically, the larger the reflector spacing between the deflection reflectors 21 in the reflector array 2, the fewer the detection points, and if the windshield 3 has local deformation, it is easy to miss the detection. The smaller the reflector spacing, the denser the detection points, and the more points need to be processed, which is easy to affect the calculation time. In an exemplary embodiment of the present disclosure, the spacing between the deflection reflectors 21 in the reflector array 2 may be selected according to the requirements for the detection accuracy of the windshield glass 3 to be detected and the fineness of the area 31 to be detected.
[0068] In an exemplary embodiment of the present disclosure, the reflective mirror is rectangular, and the size of the reflective mirror in the first direction and the second direction may be equal, that is, the reflective mirror may be square; or, the size of the reflective mirror in the first direction and the second direction may be unequal. For example, the first direction is the left-right length direction of the reflective mirror array 2 area from the driver's perspective, and the second direction is the front-to-back width direction of the reflective mirror array 2 area from the driver's perspective.
[0069] The following briefly describes how to use the windshield glass detection device disclosed in the present invention to obtain the optical quality of the windshield glass 3 to be tested.
[0070] For different models of windshields 3 to be tested, the direction in which each sub-beam is emitted from the corresponding deflection reflector 21 can be pre-calculated. Exemplarily, the calculation method can be: the windshield 3 to be tested is fixed at a preset position on the test bench, and the camera 4 is fixed at the theoretical eye box 7 position, that is, the eye box 7 position when the error of the windshield 3 is 0. The positions of the light source 1 and the reflector array 2 are fixed, then the position of the camera 4 (xs, ys, zs) and the position (xoi, yoi, zoi) of the i-th deflection reflector 21 on the reflector array 2 are all determined. According to the theoretical surface shape and position of the windshield 3, the direction (joi, koi, loi) of the sub-beam emitted by the i-th deflection reflector 21 can be obtained. Exemplarily, the emission direction of the sub-beam corresponding to each deflection reflector 21 can be obtained by ray tracing and iterative calculation.
[0071] After the sub-beam is reflected by the windshield 3 to be tested, the image received by the camera 4 is processed by the calculation module, and the beam direction (jsi, ksi, lsi) of the sub-beam emitted by the i-th deflection reflector 21 after being reflected by the windshield 3 and entering the camera 4 can be obtained. The position and normal direction of the i-th point on the windshield 3 can be calculated. That is, the specific surface shape of the windshield 3 to be tested can be obtained.
[0072] Below, a method for obtaining a windshield surface shape measurement result is exemplarily provided, comprising steps S210 to S250:
[0073] Step S210: determining the position (xs, ys, zs) of the camera 4 and the position and posture of the i-th deflection reflector 21 according to the vehicle type corresponding to the windshield 3 to be tested;
[0074] Step S220: acquiring the test image 6 through the camera 4, and extracting the coordinates of T sub-images 60 on the test image 6 located in the test area 31;
[0075] Step S230: Calculate the direction in which the i-th sub-beam enters the camera 4 according to the coordinates of the T sub-images and the camera parameters;
[0076] Step S240: solving the reflection point of the i-th sub-beam on the windshield glass 3 to be tested;
[0077] Step S250: Calculate the normal vector of the i-th point on the windshield 3 to be tested.
[0078] Specifically, in step S210, for a known vehicle model, its theoretical eye box 7 position is known, and the position of the camera 4 can be selected based on the theoretical eye box 7 position. For example, the center of the theoretical eye box 7 position is used as the camera 4 position (xs, ys, zs), and the camera optical axis points to the horizontal direction directly forward. For example, the eye box 7 position in a certain state can also be used as the camera 4 position, such as the extreme eye box 7 position as the camera 4 position. According to the theoretical surface shape of the windshield 3 to be tested, that is, the error-free surface shape, the camera 4 position and the area to be tested 31, the position of each deflection reflector 21 and the direction of the emitted light beam can be determined, so that the sub-beam emitted by each deflection reflector 21 covers the area to be tested 31. The deflection reflectors 21 corresponding to T sub-images 60 in the area to be tested 31 are selected for detection. Among them, the theoretical coordinates of the point to be tested in the area to be tested 31 are (xw0i, yw0i, zw0i).
[0079] In step S220, after the test light enters the camera 4, a corresponding test image 6 is formed on the photosensitive plane. The coordinates of the T sub-images 60, the image of the i-th sub-beam on the camera 4, and the distance relative to the reference point are (xs i , ys i ), the reference point is the center of the image. If the camera optical axis points to the horizontal front, the direction corresponding to the reference point is the reference direction, specifically the horizontal front.
[0080] In step S230, the direction in which the i-th sub-beam enters the camera 4 is calculated, wherein the focal length of the camera 4 is f, and the direction in which the i-th beam enters the camera 4 is
[0081] In step S240, the reflection point of the i-th sub-beam on the windshield 3 to be tested is solved. Since light propagates in a straight line, the reflection point of the i-th sub-beam on the windshield 3 to be tested is the intersection of the light emitted by the i-th deflection reflector 21 to the windshield 3 to be tested and the i-th sub-beam entering the camera 4. Fig.12 As shown, the position coordinates of the i-th point Q (xwi, ywi, zwi) on the windshield 3 to be measured can be obtained by calculation.
[0082] Specifically, xwi=xs+jsi*m,
[0083] ywi=ys+ksi*m, zwi=zs+lsi*m.
[0084] In step S250, the normal vector of the i-th point (jwi, kwi, lwi) = (jsi-joi, ksi-koi, lsi-loi).
[0085] Thus, according to the above method, the position and normal direction of the i-th point on the windshield 3 can be obtained. That is, the specific surface shape of the windshield 3 to be measured can be obtained.
[0086] According to the positions and normal directions of T points on the windshield 3 , the surface shape of the windshield 3 can be controlled.
[0087] For example, the distance di of the actual position of the i-th point on the windshield 3 to be measured offset from the theoretical position can be calculated, where:
[0088] According to the optical quality requirements of the windshield glass 3 to be tested, Dmin and Dmax are set as control thresholds, and Dmin≤di≤Dmax.
[0089] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. The present disclosure is intended to cover any variations, uses or adaptations of the present disclosure, which follow the general principles of the present disclosure and include common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The description and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the appended claims.
[0090] It should be understood that the present disclosure is not limited to the precise structures that have been described above and shown in the drawings, and that various modifications and changes may be made without departing from its scope. The scope of protection of the present disclosure is limited only by the appended claims.
Claims
1. A windshield glass detection device, characterized in that: The windshield glass detection device includes a camera detection unit and a projection emission unit, wherein the projection emission unit includes a light source, a reflector array and an emission control module; the camera detection unit includes a camera and a computing module, and the reflector array includes a plurality of deflection reflectors arranged in an array; Among them, the light source is used to emit test light, the reflector array is used to adjust the postures of the multiple deflection reflectors under the control of the emission control module, so that the test light is reflected by the deflection reflectors and the windshield to be tested in turn and enters the camera, and the calculation module is used to obtain the optical quality of the windshield to be tested based on the test light received by the camera.
2. The windshield detection device according to claim 1, characterized in that: The calculation module is used to obtain the position and normal direction of any point of the windshield to be tested according to the test light received by the camera.
3. The windshield glass detection device according to claim 1, characterized in that: The test light includes a plurality of sub-beams, and each of the sub-beams corresponds to the deflection reflector one by one, so that each of the sub-beams is reflected by the deflection reflector and the windshield to be tested opposite to the sub-beam in sequence and enters the camera.
4. The windshield glass detection device according to claim 3, characterized in that: The deflecting reflector is used to make the sub-beam, after being reflected by the deflecting reflector, emit the sub-beam from the deflecting reflector to the windshield to be measured as parallel light.
5. The windshield glass detection device according to claim 4, characterized in that: The sub-beams are parallel lights.
6. The windshield glass detection device according to claim 4, characterized in that: The sub-beams are emitted divergently from the light source toward the reflector array, and the reflective surface of the deflection reflector is a parabola.
7. The windshield glass detection device according to claim 3, characterized in that: The sub-beam emitted by the projection emission unit is divergent light.
8. The windshield glass detection device according to claim 2, characterized in that: The light source includes a plurality of arrayed sub-light sources, and each sub-light source is used to emit the sub-light beams in a one-to-one correspondence.
9. The windshield glass detection device according to claim 8, characterized in that: The projection emission unit further includes a focusing module, which is disposed between the light source and the reflector array. The focusing module includes at least one focusing lens for changing the optical path of the test light from the light source to the reflector array.
10. The windshield glass detection device according to claim 1, characterized in that: The reflector array includes N deflection reflectors arranged in an array, and the reflector array is used to adjust the postures of M deflection reflectors under the control of the emission control module so that the test light passing through the M deflection reflectors cannot enter the camera; the reflector array is used to adjust the postures of P deflection reflectors under the control of the emission control module so that the test light passing through the P deflection reflectors enters the camera after being reflected by the windshield to be tested; wherein M is less than N, P is not greater than N, and M+P is not greater than N.
11. The windshield glass detection device according to claim 1, characterized in that: The deflecting reflector includes a reflective lens and a driving mechanism, wherein the driving mechanism is used to drive the reflective lens to deflect in a first direction, and the driving mechanism is also used to drive the reflective lens to deflect in a second direction, wherein the first direction is perpendicular to the second direction, and the first direction is perpendicular to the main optical axis of the reflective lens, and the second direction is perpendicular to the main optical axis of the reflective lens.
12. The windshield glass detection device according to claim 1, characterized in that: A target is provided between the light source and the reflector array, a light-through hole is provided on the target, and the test light enters the reflector array from the light-through hole; When any of the sub-beams passing through the light hole enters the camera, a sub-image corresponding to the shape of the light hole is formed on the photosensitive plane of the camera.