CN216978806U - Virtual reality display lens defect detection system based on wavefront sensing - Google Patents
Virtual reality display lens defect detection system based on wavefront sensing Download PDFInfo
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- CN216978806U CN216978806U CN202220472422.9U CN202220472422U CN216978806U CN 216978806 U CN216978806 U CN 216978806U CN 202220472422 U CN202220472422 U CN 202220472422U CN 216978806 U CN216978806 U CN 216978806U
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Abstract
The utility model discloses a virtual reality display lens defect detection system based on wavefront sensing. The device comprises a light source module, a lens module and a sensor module; the light source module comprises a four-axis motion platform, and a laser diode, a collimating mirror and an iris diaphragm which are arranged in the four-axis motion platform, wherein the laser diode emits green spot laser with the wavelength of 520nm, the green spot laser is changed into plane waves after passing through the collimating mirror, and the iris diaphragm is used for adjusting the spot diameter of a light beam; the lens module comprises a manual pose adjusting table, a U-shaped clamp arranged on the manual pose adjusting table and a lens arranged in the U-shaped clamp; the sensor module comprises a two-axis motion platform, a second lens, a third lens and a Hartmann-shack wavefront phase difference sensor, wherein the second lens, the third lens and the Hartmann-shack wavefront phase difference sensor are arranged in the two-axis motion platform, and focal lengths of the second lens and the third lens are the same. The scheme provided by the utility model can simulate an actual wearing state to measure wearing wavefront aberration and wearing focal power at the front surface of the cornea.
Description
Technical Field
The utility model relates to the technical field of optical detection, in particular to a virtual reality display lens defect detection system based on wavefront sensing.
Background
The quality of the virtual reality display lens directly influences the eyesight of a user, and how to design a virtual reality display lens defect detection system to realize accurate detection is very necessary. The emergence and development of human eye wavefront aberration detection technology provides the possibility of realizing the beyond-visual-acuity effect of retina imaging with zero aberration. The wide application of the free-form surface lens represented by the progressive multi-focus lens and having the advantages of light and thin appearance, multi-vision correction function and the like provides new requirements and challenges for the existing virtual reality display lens detection method and technology. At present, no suitable virtual reality display lens aberration measurement and imaging quality evaluation device and method exist at home and abroad. This is not conducive to standardizing and developing the virtual reality display lens market. Therefore, how to accurately measure and evaluate the imaging quality of the virtual reality display lens and establish a corresponding measurement standard becomes an urgent problem for the development of the whole industry.
SUMMERY OF THE UTILITY MODEL
In view of the defects of the prior art, the main object of the present invention is to provide a virtual reality display lens defect detection system based on wavefront sensing, which can simulate an actual wearing state to measure wearing wavefront aberration and wearing focal power at the corneal front surface.
In order to achieve the purpose, the utility model provides the following technical scheme: a virtual reality display lens defect detection system based on wavefront sensing comprises a light source module, a lens module and a sensor module; the light source module comprises a four-axis motion platform, a laser diode, a collimating mirror and an iris diaphragm, wherein the laser diode, the collimating mirror and the iris diaphragm are arranged in the four-axis motion platform, the laser diode emits green point laser with the wavelength of 520nm, the green point laser is changed into plane waves after passing through the collimating mirror, and the iris diaphragm is used for adjusting the spot diameter of a light beam; the lens module comprises a manual pose adjusting table, a U-shaped clamp arranged on the manual pose adjusting table and a lens arranged in the U-shaped clamp; the sensor module comprises a two-axis motion platform, a second lens, a third lens and a Hartmann-shack wavefront phase difference sensor, wherein the second lens, the third lens and the Hartmann-shack wavefront phase difference sensor are arranged in the two-axis motion platform, and focal lengths of the second lens and the third lens are the same.
Preferably, the laser diode, the collimating mirror and the iris diaphragm are packaged into a whole.
Preferably, the second lens, the third lens and the Hartmann-shack wavefront phase difference sensor are packaged into a whole.
Preferably, the measuring surface of the Hartmann-shack wavefront phase difference sensor is positioned at the back focus of the third lens.
Compared with the prior art, the method has the advantages that the method for measuring the transmission wavefront aberration of the spectacle lens in the actual wearing state is realized, and the wearing wavefront aberration and the wearing focal power at the front surface of the cornea can be measured in the actual wearing state in a simulated mode. The structures of the light source module, the lens module and the sensor module ensure that the motion scanning measurement of the lens and the accurate pose control of each module can be realized. The track of the lens injected by the light source is in accordance with the actual observation state, and the Hartmann-shack wavefront aberration sensor can realize the measurement of the wavefront aberration of the front surface of the cornea under the observation of different wearing postures and different visual angles. The connection and control of the motion axis and the sensor are realized, and the process of automatically scanning and measuring the wavefront aberration on the front surface of the cornea of the lens under the input of the personalized lens wearing posture parameters and the measurement parameters is completed.
Drawings
Fig. 1 is a schematic structural diagram of a virtual reality display lens defect detection system based on wavefront sensing according to the present invention.
In the figure: 1. a light source module; 2. a lens module; 3. a sensor module; 4. a four-axis motion platform; 5. a laser diode; 6. a collimating mirror; 7. an iris diaphragm; 8. a manual pose adjusting table; 9. a U-shaped clamp; 10. a lens; 11. a two-axis motion platform; 12. a second lens; 13. a third lens; 14. a hartmann-shack wavefront phase difference sensor.
Detailed Description
The utility model will be further explained with reference to the drawings.
As shown in fig. 1, a virtual reality display lens defect detection system based on wavefront sensing includes a light source module, a lens module and a sensor module; the light source module comprises a four-axis motion platform, a laser diode, a collimating mirror and an iris diaphragm, wherein the laser diode, the collimating mirror and the iris diaphragm are arranged in the four-axis motion platform, the laser diode emits green point laser with the wavelength of 520nm, the green point laser is changed into plane waves after passing through the collimating mirror, and the iris diaphragm is used for adjusting the spot diameter of a light beam; the lens module comprises a manual pose adjusting table, a U-shaped clamp arranged on the manual pose adjusting table and a lens arranged in the U-shaped clamp; the sensor module comprises a two-axis motion platform, a second lens, a third lens and a Hartmann-shack wavefront phase difference sensor, wherein the second lens, the third lens and the Hartmann-shack wavefront phase difference sensor are arranged in the two-axis motion platform, and focal lengths of the second lens and the third lens are the same.
Preferably, the laser diode, the collimating mirror and the iris diaphragm are packaged into a whole.
Preferably, the second lens, the third lens and the Hartmann-shack wavefront phase difference sensor are packaged into a whole.
Preferably, the measuring surface of the Hartmann-shack wavefront phase difference sensor is positioned at the back focus of the third lens.
According to the virtual reality display lens defect detection system based on wavefront sensing, a light source module comprises a Laser Diode (LD), a collimating mirror and an iris diaphragm. The laser diode is green light point laser with the wavelength of 520nm, and the power of the laser diode is adjustable within 30 mw. The reason for selecting the wavelength is that the Hartmann-shack wave front aberration sensor has the highest relative sensitivity to the wavelength, and green light or red light is generally adopted for detecting the wave front aberration of human eyes, so that the green light measuring lens can be directly compared with the detection result of the wave front aberration of the human eyes. The point light source emitted by the laser diode is changed into plane wave after passing through the collimating mirror, wherein the distance between the laser diode and the collimating mirror can be finely adjusted, so that the laser diode is positioned at the focus of the collimating mirror, emergent light passing through the collimating mirror is parallel light with extremely small wave front aberration, and the wave front aberration of incident light can be eliminated by the calibration operation of the Hartmann-shack wave front aberration sensor during measurement; the parallel light emitted by the collimating lens passes through the adjustable diaphragm to adjust the spot diameter of the measuring beam. The laser diode, the collimating mirror and the iris diaphragm are packaged into a whole and fixed on a four-axis high-precision motion platform, so that multi-angle adjustability is realized, the laser diode, the collimating mirror and the iris diaphragm are ensured to realize four-degree-of-freedom motion as a whole, the motion is used for controlling the posture of incident light, and the track of the lens irradiated by light when different subregions of the lens are scanned and measured in an actual wearing state is simulated.
When the source module is installed, the center of the incident light spot passes through the center of the lens. The lens module comprises a manual pose adjusting table and a U-shaped clamp fixed on the manual pose adjusting table. The U-shaped clamp is used for clamping the tested lens.
The sensor module comprises two second lenses with the same focal length, a third lens and a Hartmann-shack wavefront aberration sensor. The distance between the two lenses is twice of the focal length of the two lenses so as to form an optical 4F (4 focalength Long) system, the measuring surface of the Hartmann-shack wavefront aberration sensor is positioned at the back focal point of the third lens, the vertex of the front surface of the cornea is positioned at the front focal point of the second lens, namely the measuring surface of the Hartmann-shack wavefront aberration sensor is conjugated with the front focal plane of the second lens; the second lens, the third lens and the Hartmann-shack wavefront aberration sensor are packaged into a whole and fixed on a two-axis high-precision motion platform to realize rotation around an X axis and a Y axis, so that the rotation measuring surface of the Hartmann-shack wavefront aberration sensor is the front surface of the cornea, and the wearing wavefront aberration and the wearing focal power on the front surface of the cornea can be obtained.
It should be noted that the structures and principles of the four-axis motion platform, the manual pose adjusting platform and the two-axis motion platform in the present solution are all mature products in the market, and the present solution is not described herein again. In addition, if the multi-angle rotary motion of each module is realized by adopting the high-precision multi-axis manipulator, the aim of the scheme can be also realized.
The method for measuring the transmission wavefront aberration of the spectacle lens in the actual wearing state is realized, and the wearing wavefront aberration and the wearing focal power at the front surface of the cornea can be measured in the actual wearing state. The structures of the light source module, the lens module and the sensor module ensure that the motion scanning measurement of the lens and the accurate pose control of each module can be realized. The track of the lens injected by the light source is in accordance with the actual observation state, and the Hartmann-shack wavefront aberration sensor can realize the measurement of the wavefront aberration of the front surface of the cornea under the observation of different wearing postures and different visual angles. The connection and control of the motion axis and the sensor are realized, and the process of automatically scanning and measuring the wavefront aberration on the front surface of the lens cornea under the input of the personalized lens wearing posture parameters and the measurement parameters is completed.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and adaptations to those skilled in the art without departing from the principles of the present invention should also be considered as within the scope of the present invention.
Claims (4)
1. The utility model provides a virtual reality shows lens defect detecting system based on wave front sensing which characterized in that: the device comprises a light source module, a lens module and a sensor module; the light source module comprises a four-axis motion platform, a laser diode, a collimating mirror and an iris diaphragm, wherein the laser diode, the collimating mirror and the iris diaphragm are arranged in the four-axis motion platform, the laser diode emits green point laser with the wavelength of 520nm, the green point laser is changed into plane waves after passing through the collimating mirror, and the iris diaphragm is used for adjusting the spot diameter of a light beam; the lens module comprises a manual pose adjusting table, a U-shaped clamp arranged on the manual pose adjusting table and a lens arranged in the U-shaped clamp; the sensor module comprises a two-axis motion platform, a second lens, a third lens and a Hartmann-shack wavefront phase difference sensor, wherein the second lens, the third lens and the Hartmann-shack wavefront phase difference sensor are arranged in the two-axis motion platform, and focal lengths of the second lens and the third lens are the same.
2. The virtual reality display lens defect detection system based on wavefront sensing of claim 1, characterized in that: the laser diode, the collimating mirror and the iris diaphragm are packaged into a whole.
3. The virtual reality display lens defect detection system based on wavefront sensing of claim 1, characterized in that: the second lens, the third lens and the Hartmann-shack wavefront phase difference sensor are packaged into a whole.
4. The virtual reality display lens defect detection system based on wavefront sensing of claim 1, characterized in that: and the measuring surface of the Hartmann-shack wavefront phase difference sensor is positioned at the back focus of the third lens.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220472422.9U CN216978806U (en) | 2022-03-04 | 2022-03-04 | Virtual reality display lens defect detection system based on wavefront sensing |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202220472422.9U CN216978806U (en) | 2022-03-04 | 2022-03-04 | Virtual reality display lens defect detection system based on wavefront sensing |
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| CN216978806U true CN216978806U (en) | 2022-07-15 |
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| CN202220472422.9U Active CN216978806U (en) | 2022-03-04 | 2022-03-04 | Virtual reality display lens defect detection system based on wavefront sensing |
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