CN108801924A - A kind of optical test equipment - Google Patents
A kind of optical test equipment Download PDFInfo
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- CN108801924A CN108801924A CN201810956448.9A CN201810956448A CN108801924A CN 108801924 A CN108801924 A CN 108801924A CN 201810956448 A CN201810956448 A CN 201810956448A CN 108801924 A CN108801924 A CN 108801924A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/01—Arrangements or apparatus for facilitating the optical investigation
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/84—Systems specially adapted for particular applications
- G01N21/88—Investigating the presence of flaws or contamination
- G01N21/95—Investigating the presence of flaws or contamination characterised by the material or shape of the object to be examined
- G01N21/9515—Objects of complex shape, e.g. examined with use of a surface follower device
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- Pathology (AREA)
- Length Measuring Devices By Optical Means (AREA)
- Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
Abstract
The invention discloses a kind of optical test equipments.The optical test equipment includes vision camera, optic test camera, slide unit component and controller；Wherein, the vision camera is configurable for obtaining the location information of product to be measured, and the location information is exported to the controller；The optic test camera is configurable for carrying out optic test to product to be measured, and the optic test camera and the position of the vision camera are relatively fixed；The slide unit component includes driving device, and the slide unit component is configurable for carrying product to be measured, and product to be measured can be made to be moved to position corresponding with the optic test camera and the vision camera；The controller is configurable for that the driving device is made to work according to the positional information, so that product to be measured reaches position corresponding with the optic test camera.Optical test equipment provided by the invention can effectively improve the measuring accuracy of product to be measured.
Description
Technical Field
The invention relates to the technical field of test equipment, in particular to optical test equipment.
Background
Due to the popularity of VR (virtual Reality)/AR (Augmented Reality) products, many VR/AR head-mounted devices are available on the market, and people can feel pictures played by the devices through the VR/AR head-mounted devices in a very three-dimensional manner, so that very vivid experience is obtained. Among them, the detection of optical performance of VR/AR is an important task. The product can have the difference because of material and equipment in the batch production in-process product, and present equipment can not eliminate product structure difference and product positioning error, carries out optical property test to the product and can produce certain influence, causes the measuring accuracy to reduce.
The current common testing method is to use an optical camera to test the product, but cannot eliminate the influence of the positioning error and the product structure error of the product on the test. Meanwhile, the product is tested through manual shading during testing, and the testing efficiency is low. The test is carried out through the semi-shading state, and external stray light causes interference to the test.
In addition, the product moves through the cylinder, and the removal precision is low and can not the multiple spot location. Meanwhile, when the sliding table assembly is moved, most of the sliding table assembly at present adopts a relative encoder, the original point reset is needed when equipment is debugged, after emergency stop or after the equipment is stopped due to faults, the efficiency is low, the point position error is easy to occur, the sliding table assembly adopts a point position mode or pulse control mode, the original point reset path cannot be defined after the equipment is electrified again, the problem that a camera is collided can be caused, and the position change and even the damage of the camera are caused.
Therefore, a new technical solution is needed to solve these problems.
Disclosure of Invention
It is an object of the present invention to provide a new solution for an optical test apparatus.
According to a first aspect of the present invention, there is provided an optical test apparatus comprising a vision camera, an optical test camera, a slide table assembly and a controller; wherein,
the vision camera is configured to acquire position information of a product to be tested and output the position information to the controller;
the optical test camera is configured to be used for optically testing a product to be tested, and the position of the optical test camera and the position of the vision camera are fixed relatively;
the sliding table assembly comprises a driving device, is configured to bear a product to be tested and can enable the product to be tested to move to positions corresponding to the optical testing camera and the vision camera;
the controller is configured to operate the driving device according to the position information to enable the product to be tested to reach a position corresponding to the optical test camera.
Optionally, the sliding table assembly is a three-axis sliding table, and the three-axis sliding table includes an X-axis sliding table, a Y-axis sliding table and a Z-axis sliding table; wherein:
the Y-axis sliding table is arranged on a sliding block of the X-axis sliding table and can slide along an X axis, the Z-axis sliding table is arranged on a sliding block of the Y-axis sliding table and can slide along a Y axis, the X-axis sliding table, the Y-axis sliding table and the Z-axis sliding table all comprise driving devices, and products to be tested are arranged on a sliding block of the Z-axis sliding table.
Optionally, the driving device includes a communication port connected to the controller via a network cable.
Optionally, the driving device includes a motor and a driver for driving the motor, and the driver includes an EtherNet/IP communication port.
Optionally, the sliding table assembly includes an absolute encoder configured to acquire position information of a product to be tested.
Optionally, the positioning device is disposed on the sliding table assembly, and the positioning device is configured to carry and position a product to be tested.
Optionally, the optical testing system further comprises a camera sliding table, and the vision camera and the optical testing camera are arranged on the respective camera sliding table.
Optionally, the camera slide is a six-axis slide.
Optionally, the protective cover further comprises an opening, and a sliding door capable of closing the opening is arranged on the protective cover; the vision camera, the optical test camera and the controller are accommodated in the protective cover, the optical test equipment comprises a feeding station and a testing station, the feeding station is located outside the protective cover, the testing station is located in the protective cover, the opening is located between the feeding station and the testing station, and the sliding table assembly is configured to enable a product to be tested to be transferred between the testing station and the feeding station.
Optionally, the system further comprises an industrial personal computer, wherein the industrial personal computer is configured to convert the position information into point location information and transmit the point location information to the controller.
According to the embodiment disclosed by the invention, the test precision of the product to be tested can be effectively improved.
Other features of the present invention and advantages thereof will become apparent from the following detailed description of exemplary embodiments thereof, which proceeds with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description, serve to explain the principles of the invention.
FIG. 1 is a schematic diagram of an optical inspection apparatus provided in an embodiment of the present invention;
FIG. 2 is a schematic diagram of an execution portion of a test apparatus provided in an embodiment of the present invention;
FIG. 3 is a schematic view of a protective cover provided by an embodiment of the present invention;
FIG. 4 is a schematic internal view of a work table provided in accordance with an embodiment of the present invention;
fig. 5 is a schematic diagram of a six-axis slip table according to an embodiment of the present invention.
Description of reference numerals:
1-workbench, 2-shield, 3-test equipment execution part, 4-display, 5-X axis slide, 6-Y axis slide, 7-Z axis slide, 8-positioning device, 9-linear guide, 10-camera slide, 101-first cross roller slide, 102-second cross roller slide, 103-goniometer slide, 104-rotary slide, 11-optical test camera, 12-vision camera, 13-sliding door, 14-driving cylinder, 15-sliding door guide, 16-operation button, 17-emergency stop button, 18-reset button, 19-tricolor indicator light, 20-driver, 21-controller, 22-electrical control module.
Detailed Description
Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. It should be noted that: the relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise.
The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.
Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail but are intended to be part of the specification where appropriate.
In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.
The present invention provides an optical test apparatus, as shown in fig. 1-4, including a vision camera 12, an optical test camera 11, a slide table assembly, and a controller 21. Specifically, the vision camera 12 is used to acquire position information of the product to be measured and output the position information to the controller 21. The optical testing camera 11 is used for performing optical testing on a product to be tested, and the positions of the optical testing camera 11 and the visual camera 12 are relatively fixed. The sliding table assembly comprises a driving device, and is used for bearing a product to be tested and enabling the product to be tested to move to a position corresponding to the optical testing camera 11 and the vision camera 12. The controller 21 is connected to the vision camera 12, the optical testing camera 11 and the driving device, and the controller 21 is configured to operate the driving device according to the position information of the product to be tested, which is acquired by the vision camera 11, so that the product to be tested reaches a position corresponding to the optical testing camera.
When testing, the product that awaits measuring is placed on the slip table subassembly earlier, for example, the product that awaits measuring is the VR module, then utilize vision camera 12 to acquire the position at the optical center of lens in the VR module, in order to obtain the relative point location information at vision camera optical center of lens, for example, lens are fresnel lens, utilize vision camera 12 to shoot the VR module, obtain the fresnel stripe formation of lens, confirm the position information at lens center on vision camera 12 according to fresnel stripe formation of image, because the point location information at the optical center of vision camera 12 sets up to the fixed value in advance, consequently, can obtain the point location information at lens center. Furthermore, since the positions of the vision camera 12 and the optical detection camera 11 are relatively fixed, the point location information of the optical center of the vision camera 12 and the optical center of the optical detection camera 11 is relatively fixed, so that the distance between the optical center of the lens and the optical center of the optical test camera 11 can be calculated by using the controller 21, the controller 21 controls the driving device to move, and further drives the VR module to move, so that the optical center of the lens and the optical center of the optical test camera 11 are overlapped, and the optical test camera 11 performs an optical test on the lens.
When the optical detection device provided by the invention is used for carrying out optical detection on a VR module waiting product, the visual camera 12 can be used for firstly acquiring point position information of the product to be detected, and then the controller 21 is used for controlling the sliding table assembly to adjust the position of the product to be detected, so that the optical center of the product to be detected is aligned with the optical center of the optical test camera 11, the position error generated when the product to be detected is placed on the sliding table assembly and the errors caused by the structures of different products to be detected are avoided, and the accuracy of the test result of the optical test camera is improved.
As shown in fig. 2, the slide table is a three-axis slide table, which includes an X-axis slide table 5, a Y-axis slide table 6, and a Z-axis slide table 7. Y axle slip table 6 sets up on the slider of X axle slip table 5 and can slide along the X axle, and Z axle slip table 7 sets up on the slider of Y axle slip table 6 and can slide along the Y axle, and the product that awaits measuring sets up on the slider of Z axle slip table 7. In one embodiment, a positioning device 8 is further disposed on the Z-axis sliding table 7, and the positioning device 8 is used for carrying and positioning a product to be tested on a sliding block of the Z-axis sliding table 7.
Wherein, any one in X axle slip table, Y axle slip table and the Z axle slip table includes base, drive arrangement, lead screw, guide rail and slider. The driving device, the lead screw and the guide rail are arranged on the base. The drive means comprises a driver 20 and a motor, the driver 20 being arranged to control the rotation of the motor. The output shaft of the motor is connected with the screw rod to drive the screw rod to rotate. One end of the screw rod opposite to the motor is connected with the base through a bearing so as to reduce friction during rotation. The guide rail is arranged in parallel with the screw rod. The guide rail plays a guiding role for the sliding block, and the guide rail can prevent the sliding block from rotating in the sliding process.
For example, the screw is a ball screw, and the guide rail is a ball circulation type linear guide rail. And the ball screw and the ball circulation type linear guide rail are both provided with circulating balls. The circulating ball can obviously reduce the friction between the slide block and the lead screw and between the slide block and the guide rail, so that the friction resistance of the slide block is small, and the slide is rapid.
When the electric motor works, the motor rotates forwards and reversely to drive the ball screw to rotate. The slide block slides along the guide rail under the pushing of the ball screw, so that the position of the slide block is adjusted.
The drive 20 includes a communication port. The communication port is connected with the controller 21 through a network cable to realize the control of the controller 21 on the motors of the sliding tables. For example, the driver 20 includes an EtherNet/IP communication port, and the driver 20 of each sliding table is connected to the controller 21 through the EtherNet/IP communication port by a network cable, so as to implement bidirectional communication between the driver 20 and the controller 21, thereby implementing real-time interaction of point location information.
Further, each of the stages includes an encoder. The encoder comprises an incremental encoder and an absolute encoder, the incremental encoder cannot find a preparation position after power failure, and the incremental encoder is accurate only after returning to an original point and a zero point again. The invention preferably adopts an absolute encoder and a relative increment encoder, and the absolute encoder does not need to reset the original point when the equipment is debugged, emergently stopped or restarted after shutdown due to faults, thereby not only shortening the operation time, but also reducing the production cost. Specifically, the X-axis sliding table, the Y-axis sliding table and the Z-axis sliding table each include an absolute encoder, so that each sliding table can interact point location information with the controller 21.
In one embodiment, the controller 21 is a PLC (programmable logic controller), which is a digital arithmetic operation electronic system specifically designed for use in an industrial environment. It uses a programmable memory, in which the instructions for implementing logical operation, sequence control, timing, counting and arithmetic operation are stored, and utilizes digital or analog input and output to control various mechanical equipments or production processes. Because most of the PLCs adopt single-chip microcomputers, the integration level is high, and the reliability of the system is improved by adding corresponding protection circuits and self-diagnosis functions; the PLC programming mostly adopts a relay control ladder diagram and command sentences, the quantity of the relay control ladder diagram is much less than that of a microcomputer instruction, and the programming is simpler; when in use, the detection device is only required to be correctly connected with the motor and the I/O interface terminal of the PLC, so that the PLC can normally work and is convenient to install; the PLC is controlled by a program to execute, so that the running speed is high. The present invention is not limited to a particular type of controller 21.
In one embodiment, the optical detection device further comprises an industrial personal computer, the vision camera 12 collects position information of a product to be tested and uploads the position information to the industrial personal computer, the industrial personal computer analyzes data and then sends point position information to the controller 21, and the controller 21 controls motors of the X-axis sliding table 5, the Y-axis sliding table 6 and the Z-axis sliding table 7 to enable the product to be tested to move to a position corresponding to the optical test camera 11, so that test accuracy is improved.
Furthermore, the optical test apparatus comprises a protective cover 2, the protective cover 2 comprising an opening and being provided with a sliding door 13 capable of closing the opening. The test equipment performing part 3, i.e., the vision camera 12, the optical test camera 11, and the controller 21 are housed in the protective cover 2, the optical test equipment includes a loading station located outside the protective cover 2 and a test station located inside the protective cover 2, an opening is located between the loading station and the test station, and a slide table is configured to enable a product to be tested to be transferred between the test station and the loading station.
Specifically, as shown in fig. 3, the sliding door 13 is disposed on a sliding door guide rail 15, and the driving cylinder 14 is used for driving the sliding door 13 to slide left and right on the sliding door guide rail 15, so as to achieve the purpose of automatically opening and closing the sliding door 13, and further achieve the purpose of shading light. When testing, push-and-pull door 13 is opened under the effect that drives actuating cylinder 14, and the slip table passes the opening and removes the material loading station outside protection casing 2, then will await measuring the product and place positioner 8 on, accomplish the material loading back, the slip table passes the opening and removes the detection station in the protection casing 2, and push-and-pull door 13 closes under the effect that drives actuating cylinder 14 after that, makes the product that awaits measuring be in the test environment of no external light interference, has improved optical test equipment's test accuracy.
In one embodiment, the shield 2 is provided with an operation button 16, an emergency stop button 17, a reset button 18, a tri-color indicator light 19, and a display 4. Wherein, the operation button 16 is a button for controlling the operation of the equipment, the emergency stop button 17 is an equipment stop button for the emergency of the equipment, the reset button 18 is used for resetting the equipment after the emergency stop of the equipment, the three-color indicator lamp 19 is used for indicating the state of the equipment, and the display 4 is used for displaying the test result. The arrangement of the buttons, the indicator lamps and the display facilitates the operation of the equipment, and the testing efficiency can be improved.
As shown in fig. 1 and 4, the optical test apparatus further includes a table 1, a protection cover 2 is disposed on the table 1, a test apparatus executing portion 3 is disposed on the table 1 and covered by the protection cover 2, and an electrical control module 22 is accommodated in a cavity formed by the table 1. The electrical control module 22 includes electrical necessary components such as the controller 21 and the switching power supply, and is used for controlling the device to operate according to a preset operation.
In addition, the optical detection device further comprises a camera slide table 10, and a vision camera 12 and an optical test camera 11 are arranged on the respective camera slide table 10. The positions of the optical test camera 11 and the vision camera 12 can be adjusted by the camera slide 10. After the position adjustment of the optical test camera 11 and the visual camera 12 is completed, the point location information of the optical test camera 11 and the visual camera 12 is output to the controller 21, after the point location information of the product to be tested relative to the visual camera 12 is obtained by the controller 21, because the relative positions of the optical test camera 11 and the visual camera 12 are fixed, the point location information of the product to be tested relative to the optical camera 11 can be indirectly obtained, and then the controller 21 sends a signal to the motor according to the point location information of the product to be tested relative to the optical camera 11, so that the product to be tested is moved to the position corresponding to the optical test camera 11, namely, the optical center of the optical test camera 11 is aligned with the optical center of the product to be tested.
Alternatively, the camera slide 10 is a six-axis slide, enabling the positions of the optical test camera 11 and the vision camera 12 to be adjusted more precisely from multiple orientations. As shown in fig. 5, the six-axis slide table includes a first cross roller type slide table 101, a second cross roller type slide table 102, an goniometer slide table 103, and a rotary slide table 104, and the camera is connected to the rotary slide table 104. Specifically, the first cross roller type sliding table 101 is used for performing linear adjustment on the camera in the Z-axis direction, the second cross roller type sliding table 102 is used for performing linear adjustment on the camera in the X-axis direction and the Y-axis direction, the goniometer sliding table 103 is used for enabling the camera to rotate around the X-axis direction and the Y-axis direction for angle adjustment, and the rotary sliding table 104 is used for enabling the camera to rotate around the Z-axis direction for angle adjustment, so that six-axis adjustment on the camera is achieved.
The installation sequence of the first cross roller type sliding table 101, the second cross roller type sliding table 102, the goniometer sliding table 103 and the rotary sliding table 104 when they are combined to form a six-axis sliding table can be adjusted as required, for example, the first cross roller type sliding table 101 and the second cross roller type sliding table 102 are arranged on the goniometer sliding table 103 above the rotary sliding table 104, and the camera is connected with the second cross roller type sliding table 102, which is not limited in this respect.
Optionally, the model of the first cross roller type sliding table 101 is ZLPG60, the model of the second cross roller type sliding table 102 is XYSPG60, the model of the goniometer sliding table 103 is GPWG60-75, and the model of the rotary sliding table 104 is RPG60, and those skilled in the art can select other models of sliding tables according to needs, which is not limited in the present invention.
When the optical test equipment provided by the invention works, the driving cylinder 14 is used for opening the sliding door 13, then a product to be tested is placed on the positioning device 8, and then the sliding door is closed for testing. Firstly, the vision camera 12 collects the position information of the product to be tested and uploads the industrial personal computer, secondly, the industrial personal computer analyzes data and then sends point location information to the PLC, then the PLC controls the motors of the X-axis sliding table 5, the Y-axis sliding table 6 and the Z-axis sliding table 7 to enable the product to be tested to move to the position corresponding to the optical testing camera 11, and finally testing is carried out. After the test is finished, the sliding door 13 is automatically opened, and the X-axis sliding table 5, the Y-axis sliding table 6 and the Z-axis sliding table 7 are automatically reset to return to the initial positions. The state of equipment in the test procedure can utilize tristimulus designation lamp 19, and the test result can show display 4 on, conveniently observes equipment operating condition, if equipment breaks down, can in time discover.
The invention can effectively improve the test precision of the equipment, improve the test efficiency and the equipment stability, can meet the optical performance test of VR products waiting for test, has the characteristics of high efficiency, high precision, high reliability and convenient product taking and placing, and can meet the production test requirements of factories.
Although some specific embodiments of the present invention have been described in detail by way of examples, it should be understood by those skilled in the art that the above examples are for illustrative purposes only and are not intended to limit the scope of the present invention. It will be appreciated by those skilled in the art that modifications may be made to the above embodiments without departing from the scope and spirit of the invention. The scope of the invention is defined by the appended claims.
Claims (10)
1. An optical test device is characterized by comprising a vision camera, an optical test camera, a sliding table assembly and a controller; wherein,
the vision camera is configured to acquire position information of a product to be tested and output the position information to the controller;
the optical test camera is configured to be used for optically testing a product to be tested, and the position of the optical test camera and the position of the vision camera are fixed relatively;
the sliding table assembly comprises a driving device, is configured to bear a product to be tested and can enable the product to be tested to move to positions corresponding to the optical testing camera and the vision camera;
the controller is configured to operate the driving device according to the position information to enable the product to be tested to reach a position corresponding to the optical test camera.
2. The optical test apparatus of claim 1, wherein the slide assembly is a three-axis slide including an X-axis slide, a Y-axis slide, and a Z-axis slide; wherein:
the Y-axis sliding table is arranged on a sliding block of the X-axis sliding table and can slide along an X axis, the Z-axis sliding table is arranged on a sliding block of the Y-axis sliding table and can slide along a Y axis, the X-axis sliding table, the Y-axis sliding table and the Z-axis sliding table all comprise driving devices, and products to be tested are arranged on a sliding block of the Z-axis sliding table.
3. An optical test apparatus as claimed in claim 2, wherein the drive means comprises a communications port connected to the controller by a network cable.
4. The optical testing apparatus of claim 3, wherein the drive means comprises a motor and a driver for driving the motor, the driver comprising an EtherNet/IP communication port.
5. The optical test apparatus of claim 2, wherein the slide assembly includes an absolute encoder configured to acquire position information of a product to be tested.
6. The optical test apparatus of claim 1, further comprising the positioning device disposed on the slide assembly, the positioning device configured to carry and position a product to be tested.
7. The optical test apparatus of claim 1, further comprising a camera slide, the vision camera and the optical test camera being disposed on respective camera slides.
8. The optical test apparatus of claim 7, wherein the camera slide is a six axis slide.
9. The optical test apparatus of claim 1, further comprising a protective cover comprising an opening and provided with a sliding door capable of closing the opening; the vision camera, the optical test camera and the controller are accommodated in the protective cover, the optical test equipment comprises a feeding station and a testing station, the feeding station is located outside the protective cover, the testing station is located in the protective cover, the opening is located between the feeding station and the testing station, and the sliding table assembly is configured to enable a product to be tested to be transferred between the testing station and the feeding station.
10. The optical test equipment of claim 1, further comprising an industrial personal computer configured to convert the position information into point location information and transmit the point location information to the controller.
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| CN201810956448.9A CN108801924B (en) | 2018-08-21 | 2018-08-21 | Optical test equipment |
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| CN201810956448.9A CN108801924B (en) | 2018-08-21 | 2018-08-21 | Optical test equipment |
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| CN114296393A (en) * | 2021-12-29 | 2022-04-08 | 北京半导体专用设备研究所（中国电子科技集团公司第四十五研究所） | Zero-returning method and device for motion platform, electronic equipment and storage medium |
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