Imaging quality testing device

Abstract

The utility model discloses an imaging quality testing device, which relates to the field of imaging quality testing and comprises a first light source, a second light source, a first light splitting element, a second light splitting element, a product to be tested, a first detection camera, a second detection camera, a third detection camera and a control system. The first light source, the first light splitting element, the to-be-detected product, the second light splitting element and the first detection camera are sequentially arranged along the light path propagation direction and are kept coaxial; the second detection camera is arranged on one side of the first light splitting element; the second light source and the third detection camera are respectively arranged on two different sides of the second light splitting element, and the second light source, the second light splitting element and the third detection camera are coaxial; the control system is electrically connected with each light source and the detection camera; after being split by the light splitting element, the first light source and the second light source can perform bidirectional transmission detection through the front and back surfaces of the to-be-detected product, so that the imaging quality of the front and back surfaces of the product is tested under the condition that the product is not moved.

Description

Technical Field

[0001] The utility model relates to the field of imaging quality testing, in particular to an imaging quality testing device. Background Art

[0002] Imaging quality test equipment is used to test the quality of imaging. For example, in AR / VR headsets, imaging quality testing focuses on evaluating optical clarity, color fidelity, brightness uniformity, and stereo depth perception.

[0003] In the existing technology, there are only a few types of test light sources for imaging quality testing, and they can only be used in projectors and waveguide products. Before performing imaging quality testing, the device needs to be manually debugged to ensure that the light path is coaxial during testing, which is time-consuming. When testing the forward and reverse imaging quality, the product needs to be moved to test the imaging quality in these two directions, which is more troublesome. There is no real-time monitoring function, and errors are prone to occur when testing imaging quality. Utility Model Content

[0004] The purpose of the present invention is to solve at least one of the technical problems existing in the prior art and to provide an imaging quality testing device that can perform forward and reverse imaging quality testing without moving the product.

[0005] According to an embodiment of the present invention, the imaging quality testing device includes a first light source, a second light source, a first spectroscopic element, a second spectroscopic element, a first detection camera, a second detection camera, a third detection camera, a first electric adjustment device, a second electric adjustment device, a third electric adjustment device, a fourth electric adjustment device and a control system. The first light source, the first spectroscopic element, the product to be tested, the second spectroscopic element and the first detection camera are sequentially arranged and maintained coaxial along the propagation direction of the optical path; the second detection camera is arranged on one side of the first spectroscopic element; the second light source is arranged on one side of the second spectroscopic element; the third detection camera is arranged on the other side of the second spectroscopic element, and the second light source, the second spectroscopic element and the third detection camera are coaxial; a control system is electrically connected to the first light source, the second light source, the first detection camera, the second detection camera and the third detection camera respectively; wherein the light emitted by the first light source passes through the first spectroscopic element, the product to be tested and the second spectroscopic element in sequence, and at the same time, the light is also split by the second spectroscopic element to form a first light and a second light, the first light enters the first detection camera, and the second light enters the third detection camera; the second spectroscopic element is used to split the light emitted by the second light source to form a third light and a fourth light, the second spectroscopic element transmits the third light to enter the third detection camera, and reflects the fourth light to pass through the product to be tested and the first spectroscopic element in sequence, and the fourth light is reflected by the first spectroscopic element to the second detection camera.

[0006] According to some embodiments of the present invention, the imaging quality testing device further includes a product carrier, and the product carrier is used to carry the product to be tested.

[0007] According to some embodiments of the present invention, the product carrier includes a first electric adjustment device, which is electrically connected to the control system, and the control system is used to adjust the position of the product carrier through the first electric adjustment device.

[0008] According to some embodiments of the present invention, the imaging quality testing device further includes a second electric adjustment device, the first light source is disposed on the second electric adjustment device, and the second electric adjustment device is electrically connected to the control system.

[0009] According to some embodiments of the present invention, the imaging quality testing device further includes a third electric adjustment device, the first spectroscopic element is disposed on the third electric adjustment device, and the third electric adjustment device is electrically connected to the control system.

[0010] According to some embodiments of the present invention, the imaging quality testing device also includes multiple fourth electric adjustment devices, and the first detection camera, the second detection camera and the third detection camera are respectively arranged on the corresponding fourth electric adjustment devices, and the fourth electric adjustment devices are electrically connected to the control system.

[0011] According to some embodiments of the present invention, the imaging quality testing device also includes multiple fourth electric adjustment devices, and the first detection camera, the second detection camera and the third detection camera are respectively arranged on the corresponding fourth electric adjustment devices, and the fourth electric adjustment devices are electrically connected to the control system.

[0012] According to some embodiments of the present invention, the second beam splitter element reflects 25% of the light emitted by the second light source to form the third light, and the second beam splitter element transmits 50% of the light emitted by the second light source to form the fourth light.

[0013] According to some embodiments of the present invention, the first light source and the second light source are projector light sources, lasers, LED light sources or OLED light sources.

[0014] The imaging quality testing device according to the embodiment of the present invention has at least the following beneficial effects:

[0015] The device is provided with a first light source and a second light source. After being split by the spectroscopic element, the first light source and the second light source can pass through the front and back sides of the product respectively to perform two-way transmission detection, so that the imaging quality of the front and back sides of the product can be tested without moving the product.

[0016] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0018] Figure 1 This is a structural diagram of an imaging test device according to an embodiment of the present utility model;

[0019] Reference numerals:

[0020] First light source 101, second light source 102, first spectroscopic element 201, second spectroscopic element 202, first detection camera 301, second detection camera 302, third detection camera 303, first electric adjustment device 401, second electric adjustment device 402, third electric adjustment device 403, fourth electric adjustment device 404, control system 500. DETAILED DESCRIPTION

[0021] This section will describe in detail the specific embodiments of the present invention. The preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the accompanying drawings is to supplement the description of the text part of the specification with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but it cannot be understood as a limitation on the scope of protection of the present invention.

[0022] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0023] In the description of this utility model, "several" means one or more, "many" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and is not to be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0024] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0025] Reference Figure 1The present invention provides an imaging quality testing device, comprising a first light source 101, a first beam splitter 201, a product to be tested, a second beam splitter 202, a first detection camera 301, a second detection camera 302, a second light source 102, a third detection camera 303, and a control system 500. The first light source 101, the first beam splitter 102, the product to be tested, the second beam splitter 202, and the first detection camera 301 are sequentially arranged along the optical path propagation direction and remain coaxial; the second detection camera 302 is arranged on one side of the first beam splitter 201, and the second light source 102 is arranged on one side of the second beam splitter 202; the third detection camera 303 is arranged on the other side of the second beam splitter 202; the second light source 102, the second beam splitter 202, and the third detection camera 303 are coaxial; and the control system 500 is electrically connected to the first light source 101, the second light source 102, the first detection camera 301, the second detection camera 302, and the third detection camera 303.

[0026] Among them, the light emitted by the first light source 101 passes through the first spectroscopic element 201, the product to be tested and the second spectroscopic element 202 in sequence, and is then split by the second spectroscopic element 202 to form a first light and a second light. The first light enters the first detection camera 301, and the second light enters the third detection camera 303; the light emitted by the second light source 102 passes through the second spectroscopic element 202 and is split into a third light and a fourth light. The third light enters the third detection camera 303, and the fourth light passes through the product to be tested and the first spectroscopic element 201 in sequence, and is reflected by the first spectroscopic element 201 to the second detection camera 302.

[0027] It should be noted that the first and second beam splitting elements 201 and 202 may be beam splitting devices such as beam splitting prisms or gratings for splitting the light. The first, second, and third detection cameras 301, 302, and 303 may be CCD (charge coupled device) cameras or CMOS (complementary metal oxide semiconductor) cameras.

[0028] In some embodiments of the present invention, the control system 500 includes three subsystems: a light source driving system, an electric adjustment device control system, and an image collection and processing system.

[0029] Reference Figure 1In this example, an AR / VR waveguide product to be tested is placed, and the light source driving system in the control system 500 lights up the first light source 101. The light emitted by the first light source 101 is split by the first spectroscopic element 201. The first spectroscopic element 201 transmits the light to the waveguide product to be tested. The product to be tested performs total internal reflection and diffraction on the incident light, and then emits the processed light to the second spectroscopic element 202. The second spectroscopic element 202 transmits the light to the first detection camera 301 to detect the imaging quality, wherein the second spectroscopic element 202 reflects 50% of the light and enters the third detection camera 303 to monitor the coaxial state of the optical path; without moving the direction of the product to be tested, the light source driving system in the control system 500 lights up the second light source 102. The light emitted by the second light source 102 is split by the second spectroscopic element 201. The second spectroscopic element 201 reflects 25% of the light and is incident on the waveguide product to be tested on the first electric adjustment device ... The processed light is then emitted to the first beam splitter 201. The first beam splitter 201 reflects the light to the second detection camera 301 for image quality detection. The second beam splitter 202 also transmits 50% of the light to the third detection camera 303 to monitor the coaxial state of the optical path. During these two processes, the third detection camera 303 always monitors the coaxial state of the optical path. For example, the third detection camera 303 will feed back the collected light spot image to the control system 500. The image collection and processing system of the control system 500 will process and calculate the input light spot centroid image information to calculate the coordinate position of the light spot centroid. The coordinate position information is input to the electric adjustment device control system of the control system 500. If the coordinate position of the light spot centroid deviates, it is determined that the optical path is not in a coaxial state. The electric adjustment device control system of the control system 500 will control the corresponding components to adjust according to this information until the optical paths are in a coaxial state.

[0030] Furthermore, in some embodiments of the present invention, the imaging quality testing device also includes a product carrier, which is used to carry the product to be tested and fix the position of the product to be tested, so that the process of testing the imaging quality can prevent the product to be tested from shaking or shifting, thereby reducing the error of the test results.

[0031] Furthermore, in some embodiments of the present invention, the product carrier includes a first electric adjustment device 401, which is electrically connected to a control system 500. Specifically, the control system 500 is configured to adjust the position of the product carrier via the first electric adjustment device 401 so that the product under test remains coaxial with the first light source 101, the first beam splitter element 201, the second beam splitter element 202, and the first detection camera, thereby improving the stability and accuracy of product imaging quality testing.

[0032] Furthermore, in some embodiments of the present invention, the imaging quality testing device further includes a second electric adjustment device 402, on which the first light source 101 is disposed, and the second electric adjustment device 402 is electrically connected to the control system 500. Before placing the product to be tested for product imaging quality testing, the device needs to be calibrated. Specifically, after the light source drive system of the control system 500 illuminates the first light source 101, the electric adjustment device control system of the control system 500 controls the second electric adjustment device 402 to adjust the position of the first light source 101, so that the first light source 101 and the third detection camera 303 remain coaxial, thereby reducing errors in the test results.

[0033] Furthermore, in some embodiments of the present invention, the imaging quality testing device further includes a third electric adjustment device 403, the first spectroscopic element 201 is disposed on the third electric adjustment device 403, and the third electric adjustment device 403 is electrically connected to the control system 500. Before placing the product to be tested for product imaging quality testing, the device needs to be calibrated, and the system calibration also requires adjustment of the first spectroscopic element 201 and the second spectroscopic element 202. Specifically, the first spectroscopic element 201 is placed, the light source driving system of the control system 500 lights up the first light source 101, and the electric adjustment device control system of the control system 500 controls the third electric adjustment device 403 to adjust the position of the first spectroscopic element 201 so that the transmission direction of the first spectroscopic element 201 is coaxial with the third detection camera 303. The second spectroscopic element 202 is also adjusted in the same way so that its transmission direction is coaxial with the third detection camera, thereby improving the stability and accuracy of the imaging quality test.

[0034] Furthermore, in some embodiments of the present invention, the imaging quality testing device also includes a plurality of fourth electric adjustment devices 404, and the first detection camera 301, the second detection camera 302 and the third detection camera 303 are respectively arranged on the corresponding fourth electric adjustment devices 404, and each fourth electric adjustment device 404 is electrically connected to the control system 500. Before placing the product to be tested for product imaging quality testing, the device needs to be calibrated. When performing system calibration, the control system 500 can also control the corresponding fourth electric adjustment device 404 to adjust the position of the corresponding first detection camera 301, the second detection camera 302 and the third detection camera 303 so that they are in the corresponding optical path coaxial state. Combined with Figure 1It can be seen that the first detection camera 301 maintains a coaxial optical path with the first light source 101, the first beam splitter 201, the product to be tested, and the second beam splitter 202; the second detection camera 302 maintains a coaxial optical path with the first beam splitter 201; and the third detection camera 303 maintains a coaxial optical path with the second beam splitter. The third detection camera constantly monitors the coaxial state of the optical path, collects image information of the spot of light emitted from the second beam splitter 202, and feeds it back to the image collection and processing system of the control system 500. The image collection and processing system processes and calculates the input image information of the spot centroid, calculates the coordinate position of the spot centroid, and inputs this coordinate position information to the electric adjustment device control system of the control system 500. When the coordinate position of the spot centroid deviates, it is determined that the optical path is not coaxial. The electric adjustment device control system controls the corresponding electric adjustment device to adjust the corresponding components, including the first detection camera 301 and the second detection camera 302, until the optical paths are coaxial, thereby improving the stability and accuracy of the imaging quality test. It can be understood that the function of the third detection camera 303 is to monitor whether the coaxial state of the optical path of the system is normal, so as to ensure the stability and accuracy of the imaging quality test; the function of the first detection camera 301 and the second detection camera 302 is to collect the imaging of the product to be tested for imaging quality testing. Specifically, the first detection camera 301 and the second detection camera 302 collect the imaging formed by the light passing through the product to be tested, and input the imaging information into the image collection and processing system of the control system 500. The image collection and processing system analyzes the imaging information, evaluates the degree of imaging distortion, calculates the MTF curve, and calculates imaging clarity and other imaging quality-related parameters.

[0035] It should be noted that the first electric adjustment device 401 , the second electric adjustment device 402 , the third electric adjustment device 403 and the fourth electric adjustment device 404 may adopt a structure capable of adjusting position, such as a multi-axis adjustment robot arm or a screw transmission device.

[0036] Furthermore, in some embodiments of the present invention, the second beam splitter 202 reflects 50% of the light emitted by the first light source 101, forming a first light beam that is reflected to the third detection camera 303; the second beam splitter 202 transmits 50% of the light emitted by the first light source 101, forming a second light beam that is transmitted to the first detection camera 301. The use of the second beam splitter 202 enables simultaneous testing of imaging quality while monitoring the coaxial state of the system's optical path using the third detection camera 303. The 50% ratio of the light splitter 202 to the third detection camera 303 ensures that the brightness of the light spot is moderate, neither overexposed nor overly dark, so that the complete information of the light spot can be accurately captured and its center of mass position calculated.

[0037] Furthermore, in some embodiments of the present invention, the second beam splitter 202 reflects 25% of the light emitted by the second light source 102 to form a third light beam, which is then reflected to the product under test. The second beam splitter 202 transmits 50% of the light emitted by the second light source 102 to form a fourth light beam, which is then transmitted to the third detection camera 303. The use of the second beam splitter 202 enables simultaneous testing of imaging quality while monitoring the coaxial state of the system's optical path using the third detection camera 303. The 50% ratio of light split by the second beam splitter 202 to the third detection camera 303 ensures that the brightness of the light spot is moderate, neither overexposed nor overly dark, so that the complete information of the light spot can be accurately captured and its center of mass position calculated.

[0038] Furthermore, in some embodiments of the present invention, the first light source 101 and the second light source 102 are projector light sources, lasers, LED light sources, or OLED light sources. These light sources emit light with higher brightness, more saturated colors, lower energy consumption, and longer lifespan than conventional light sources, offering advantages in the field of near-eye displays. Using these test light sources ensures that the results of imaging quality tests are of practical value.

[0039] According to the imaging quality testing device of the embodiment of the present invention, the first light source 101 and the second light source 102, after being split by the spectroscopic element, can respectively pass through the front and back sides of the product for bidirectional transmission testing, so that the imaging quality of the front and back sides of the product can be tested without moving the product. At the same time, the device is provided with a third detection camera 303 to monitor the coaxial state of the optical path of the system. The third detection camera 303 collects the light of the third detection camera 303 split by the second spectroscopic element 202 and feeds its spot image information back to the image collection and processing system of the control system 500 for calculating the centroid position of the spot and determining the coaxial state of the optical path. If the optical path is not in the coaxial state, the electric adjustment device of the control system 500 will control the corresponding electric adjustment device to move the corresponding component until the optical path is in the coaxial state, thereby reducing the error in the imaging quality testing process. In addition, the control system 500 can be set to periodically self-check, by regularly lighting the first light source 101 and the second light source 102 for system calibration, and automatically adjusting the detection camera and spectroscopic element in the device to ensure the stability and accuracy of the test.

[0040] Throughout this specification, references to terms such as "one embodiment," "further embodiments," "some specific embodiments," or "some examples" indicate that the specific features, structures, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0041] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and purpose of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An imaging quality testing device, characterized in that: include: A first light source, a first beam splitter, a product to be tested, a second beam splitter, and a first detection camera are sequentially arranged and maintained coaxially along the propagation direction of the light path; a second detection camera, disposed on one side of the first light splitting element; a second light source, disposed on one side of the second light-splitting element; a third detection camera, disposed on the other side of the second beam splitter element, wherein the second light source, the second beam splitter element and the third detection camera are coaxial; a control system, electrically connected to the first light source, the second light source, the first detection camera, the second detection camera, and the third detection camera, respectively; Among them, the light emitted by the first light source passes through the first spectroscopic element, the product to be tested and the second spectroscopic element in sequence, and is then split by the second spectroscopic element to form a first light and a second light. The first light enters the first detection camera, and the second light enters the third detection camera; the light emitted by the second light source passes through the second spectroscopic element and is split into a third light and a fourth light. The third light enters the third detection camera, and the fourth light passes through the product to be tested and the first spectroscopic element in sequence, and is reflected by the first spectroscopic element to the second detection camera.

2. The imaging quality testing device according to claim 1, characterized in that: The imaging quality testing device further includes a product carrier, which is used to carry the product to be tested.

3. The imaging quality testing device according to claim 2, characterized in that: The product carrier includes a first electric adjustment device, which is electrically connected to the control system. The control system is used to adjust the position of the product carrier through the first electric adjustment device.

4. The imaging quality testing device according to claim 1, wherein: The imaging quality testing device further includes a second electric adjustment device, the first light source is arranged on the second electric adjustment device, and the second electric adjustment device is electrically connected to the control system.

5. The imaging quality testing device according to claim 1, wherein: The imaging quality testing device further includes a third electric adjustment device, the first light splitting element is arranged on the third electric adjustment device, and the third electric adjustment device is electrically connected to the control system.

6. The imaging quality testing device according to claim 1, characterized in that: The imaging quality testing device also includes multiple fourth electric adjustment devices, and the first detection camera, the second detection camera and the third detection camera are respectively arranged on the corresponding fourth electric adjustment devices, and the fourth electric adjustment devices are electrically connected to the control system.

7. The imaging quality testing device according to claim 1, wherein: The second beam splitter element reflects 50% of the light emitted by the first light source to form the first light; and the second beam splitter element transmits 50% of the light emitted by the first light source to form the second light.

8. The imaging quality testing device according to claim 1, wherein: The second beam splitter element reflects 25% of the light emitted by the second light source to form the third light, and the second beam splitter element transmits 50% of the light emitted by the second light source to form the fourth light.

9. The imaging quality testing device according to claim 1, wherein: The first light source and the second light source are projector light sources, lasers, LED light sources or OLED light sources.

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