WO2020192218A1

WO2020192218A1 - Angle measurement method and measurement device applied to optical system

Info

Publication number: WO2020192218A1
Application number: PCT/CN2019/129189
Authority: WO
Inventors: 孙琦
Original assignee: 歌尔股份有限公司
Priority date: 2019-03-28
Filing date: 2019-12-27
Publication date: 2020-10-01
Also published as: CN109883360B; CN109883360A

Abstract

Disclosed are an angle measurement method and measurement device applied to an optical system. The optical system comprises a lens and a display screen. The display screen includes test marks, and the test marks include a first mark and a second mark. The angle measurement method comprises: acquiring a first spacing distance between the first mark and the second mark (S100); acquiring a first optical signal of the first mark and a second optical signal of the second mark (S200); obtaining a first height value based on the first optical signal and a second height value based on the second optical signal (S300); and obtaining a first included angle between the lens and the display screen according to the first height value, the second height value and the first spacing distance (S400). The angle measurement method and measurement device applied to the optical system solve the problem of unmanageable and poor assembling quality of the optical system in the existing art due to the failure in directly measuring the angle between the lens and the display screen in the optical system.

Description

Angle measuring method and measuring device applied to optical system

Technical field

This application relates to the field of optical measurement technology, and in particular to an angle measurement method and measurement device applied to an optical system.

Background technique

Virtual Reality (VR) technology is an advanced human-computer interaction technology that comprehensively applies various technologies to create a realistic artificial simulation environment, and can effectively simulate various human perception system behaviors in the natural environment. The VR optical system is mainly composed of lenses, display screens and structural parts. Among them, the assembly position relationship between the lens and the display screen directly affects the imaging quality of the optical system. During the assembly process of the lens and the display screen, there is usually an angle error. The included angle error cannot be directly measured, so that the assembly quality cannot be controlled during the assembly process of the optical system, resulting in poor assembly quality of the optical system.

Summary of the invention

This application provides an angle measurement method and a measurement device applied to an optical system, aiming to solve the problem that the prior art cannot directly measure the angle between the lens in the optical system and the display screen, resulting in the inability to control the assembly quality of the optical system. Poor problem.

To achieve the above objective, this application proposes an angle measurement method applied to an optical system, the optical system includes a lens and a display screen, the display screen includes a test mark, and the test mark includes a center of the display screen. The center is a first mark and a second mark symmetrically arranged along the first direction; the angle measurement method applied to the optical system includes:

Acquiring a first separation distance between the first indicator and the second indicator;

Acquiring the first optical signal of the first label and the second optical signal of the second label;

Obtaining a first height value according to the first optical signal and obtaining a second height value according to the second optical signal;

The first angle between the lens and the display screen is obtained according to the first height value, the second height value and the first separation distance.

Optionally, the test mark further includes a third mark and a fourth mark symmetrically arranged in a second direction with the center of the display screen as the center, wherein the first direction and the second direction intersect and merge. All are parallel to the display screen, and the angle measurement method applied to the optical system further includes:

Acquiring a second separation distance between the third indicator and the fourth indicator;

Acquiring the third optical signal of the third label and the fourth optical signal of the fourth label;

Obtaining a third height value according to the third optical signal and obtaining a fourth height value according to the fourth optical signal;

Obtaining a second included angle between the lens and the display screen according to the third height value and the fourth height value;

A third included angle between the lens and the display screen is obtained according to the first included angle and the second included angle.

Optionally, the first direction and the second direction are perpendicular to each other.

Optionally, the first separation distance is equal to the second separation distance.

Optionally, the obtaining a first height value according to the first optical signal and obtaining a second height value according to the second optical signal includes:

Performing continuous picture collection on the first optical signal and the second optical signal;

Acquiring the clarity of a plurality of the collected pictures, and determining the collected picture with the highest definition;

Acquiring the first virtual image distance and the second virtual image distance according to the collected picture with the highest definition;

The first height value is obtained according to the first virtual image distance and the second height value is obtained according to the second virtual image distance.

Optionally, the obtaining the first height value according to the first virtual image distance and obtaining the second height value according to the second virtual image distance includes:

Establish the functional relationship between virtual image distance and height;

The first height value is obtained according to the functional relationship and the first virtual image distance, and the second height value is obtained according to the functional relationship and the second virtual image distance.

Optionally, the obtaining the first included angle between the lens and the display screen according to the first height value, the second height value, and the first separation distance includes:

Acquiring a first height difference between the first height value and the second height value;

Acquiring a first ratio value of the first height difference value and the first separation distance;

The arc tangent function value of the first proportional value is obtained, and the first included angle is obtained according to the arc tangent function value of the first proportional value.

Optionally, the obtaining the second included angle between the lens and the display screen according to the third height value and the fourth height value includes:

Acquiring a second height difference between the third height value and the fourth height value;

Acquiring a second ratio value of the second height difference value and the second separation distance;

The arc tangent function value of the second proportional value is obtained, and the second included angle is obtained according to the arc tangent function value of the second proportional value.

Optionally, the first plane is parallel to the first direction and perpendicular to the plane where the display screen is located, and the second plane is parallel to the second direction and perpendicular to the plane where the display screen is located. Obtaining the third included angle between the lens and the display screen according to the first included angle and the second included angle includes:

Obtaining a first direction vector on the first plane according to the first included angle;

Obtaining a second direction vector on the second plane according to the second included angle;

The third included angle is obtained according to the first direction vector and the second direction vector.

In order to achieve the above objective, this application proposes an angle measurement device applied to an optical system, the optical system includes a lens and a display screen, the display screen includes a test mark, and the test mark includes a first mark and a second mark; The angle measuring device applied to the optical system includes a collection unit and a controller, wherein the controller is used to obtain a first separation distance between the first mark and the second mark; the collection unit is provided in the The side of the lens away from the display screen is used to obtain the optical signal of the test mark; the acquisition unit sends the optical signal to the controller, and the controller is also used to obtain the optical signal according to the first optical The signal obtains a first height value and a second height value according to the second optical signal, and obtains the lens and the display according to the first height value, the second height value, and the first separation distance The first angle of the screen.

Optionally, the collection unit includes:

The lens module is used to receive the light emitted by the test mark and focus the light;

Sensor for receiving the optical signal of the light emitted by the test mark and focused by the lens module; wherein the optical signal includes the first optical signal of the first mark and the optical signal of the second mark The second optical signal;

The control unit is used to adjust the distance between the lens module and the sensor, and control the sensor to perform continuous picture collection on the optical signal.

In the technical solution proposed in this application, the optical system includes a lens and a display screen, the display screen includes a test mark, and the test mark includes a first symmetrical arrangement centered on the center of the display screen and along a first direction. Mark and second mark, by acquiring the optical signals emitted by the first mark and the second mark, determine the first mark distance from the first height value of the lens and the second mark distance from the lens The second height value, according to the first height value, the second height value, and the first separation distance between the first mark and the second mark, using a trigonometric function formula to determine the lens and the The first angle of the display. By acquiring the optical signals of the first mark and the second mark on the display screen, the relative included angle between the lens and the display screen is calculated, thereby solving the problem that the optical system cannot be adjusted in the prior art. Direct measurement of the angle between the lens and the display screen leads to the problem that the assembly quality of the optical system cannot be controlled and the assembly quality is poor.

Description of the drawings

In order to more clearly describe the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only These are some embodiments of the present application. For those of ordinary skill in the art, without creative work, other drawings can be obtained based on the structure shown in these drawings.

1 is a schematic flowchart of an embodiment of an angle measurement method applied to an optical system according to the present invention;

2 is a schematic flowchart of another embodiment of an angle measurement method applied to an optical system according to the present invention;

3 is a schematic flowchart of another embodiment of an angle measurement method applied to an optical system according to the present invention;

4 is a schematic flowchart of another embodiment of an angle measurement method applied to an optical system according to the present invention;

5 is a schematic flowchart of another embodiment of an angle measurement method applied to an optical system according to the present invention;

6 is a schematic flowchart of another embodiment of the angle measurement method applied to the optical system of the present invention.

The realization, functional characteristics, and advantages of the purpose of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings.

detailed description

The technical solutions in the embodiments of the present application will be described clearly and completely in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of this application.

It should be noted that all directional indications (such as up, down, left, right, front, back...) in the embodiments of this application are only used to explain the difference between components in a particular posture (as shown in the accompanying drawings). If the relative position relationship, movement situation, etc. change, the directional indication will change accordingly.

In addition, the descriptions related to "first", "second", etc. in this application are only for descriptive purposes, and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined with "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present application, "a plurality of" means at least two, such as two, three, etc., unless specifically defined otherwise.

In this application, unless otherwise clearly specified and limited, the terms "connected", "fixed", etc. should be interpreted broadly. For example, "fixed" can be a fixed connection, a detachable connection, or a whole; It can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the internal communication between two components or the interaction relationship between two components, unless specifically defined otherwise. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances.

In addition, the technical solutions between the various embodiments of the present application can be combined with each other, but must be based on what can be achieved by a person of ordinary skill in the art. When the combination of technical solutions is contradictory or cannot be achieved, it should be considered that this combination of technical solutions Does not exist, nor is it within the scope of protection required by this application.

This application provides an angle measuring method and measuring device applied to an optical system.

1, the optical system includes a lens and a display screen, the display screen includes a test mark, and the test mark includes a first mark and a first mark symmetrically arranged in a first direction with the center of the display screen as the center. Two marking; the angle measurement method applied to the optical system includes:

S100. Acquire a first separation distance between the first indicator and the second indicator;

Wherein, the distance between the first indicator and the center of the display screen is half of the first separation distance, and the distance between the second indicator and the center of the display screen is half the first separation distance.

S200: Acquire a first optical signal of the first label and a second optical signal of the second label;

Wherein, both the first optical signal and the second optical signal may be a single color or a combination of multiple colors.

S300, obtaining a first height value according to the first optical signal and obtaining a second height value according to the second optical signal;

Wherein, the first height value is the distance between the first indicator and the lens along the display screen normal direction, and the second height value is the distance between the second indicator and the lens along the display screen normal direction. The distance of the lens.

S400: Obtain a first included angle between the lens and the display screen according to the first height value, the second height value, and the first separation distance;

Wherein, the first plane is parallel to the first direction and perpendicular to the plane where the display screen is located, and the first included angle is the included angle between the lens and the display screen on the first plane.

Please refer to FIG. 2, the test mark also includes a third mark and a fourth mark symmetrically arranged along the second direction with the center of the display screen as the center, wherein the first direction and the second direction intersect and are equal Parallel to the display screen, the angle measurement method applied to the optical system further includes:

S500: Acquire a second separation distance between the third indicator and the fourth indicator;

Wherein, the distance between the third indicator and the center of the display screen is half of the fourth separation distance, and the distance between the fourth indicator and the center of the display screen is half of the fourth separation distance.

S600: Acquire a third optical signal of the third label and a fourth optical signal of the fourth label;

Wherein, both the third optical signal and the fourth optical signal may be a single color or a combination of multiple colors.

S700, obtaining a third height value according to the third optical signal and obtaining a fourth height value according to the fourth optical signal;

Wherein, the third height value is the distance between the third indicator and the lens along the display screen normal direction, and the fourth height value is the fourth indicator and the distance along the display screen normal direction. The distance of the lens.

S800: Obtain a second included angle between the lens and the display screen according to the third height value and the fourth height value;

The second plane is parallel to the second direction and perpendicular to the plane where the display screen is located, and the second included angle is the included angle between the lens and the display screen on the second plane.

S900: Obtain a third included angle between the lens and the display screen according to the first included angle and the second included angle.

Wherein, the third included angle is a relative included angle between the lens and the display screen.

In some optional embodiments, the first plane intersects the second plane. When the central axis of the lens intersects the first plane, the first angle obtained by the first height value, the second height value and the first separation distance cannot accurately determine the lens The included angle with the display screen. Therefore, the lens is measured twice in the second direction, where the first direction intersects the second direction, and after the second included angle is obtained, the first The included angle and the second included angle obtain a third included angle between the lens and the display screen.

Preferably, the first direction and the second direction are perpendicular to each other. In a specific embodiment, the first plane, the second plane, and the plane where the display screen is located are perpendicular to each other. When the first direction and the second direction are perpendicular to each other, it is convenient for the user to calculate the first included angle and the second included angle.

Preferably, the first separation distance is equal to the second separation distance. In a specific embodiment, the light emitted by the test mark on the display screen is transmitted through the lens and then emerges as parallel light, and has different display screen images. The angle between the parallel light emitted from the position of the point and the optical axis of the lens is different. An output angle corresponds to the angle after a lens is emitted. The closer the lens optical axis is to the image point where the screen is projected, the greater the inclination angle of the emitted light from the optical axis. small. Since the first included angle α and the second included angle β need to be considered in the calculation process, the first separation distance and the second separation distance need to be considered. Since the distance between the test marks is related to the inclination angle of the acquisition unit, when the first separation distance is equal to the second separation distance, all the related to the first separation distance can be simplified. The calculation process of the first included angle and the calculation process of the second included angle associated with the second separation distance are simplified, thereby reducing the difficulty of angle measurement of the optical system.

Referring to FIG. 3, in some optional implementation manners, the S300 step includes:

S310: Perform continuous picture collection on the optical signal sent by the test indicator;

S320: Obtain the definition of multiple collected pictures, and determine the collected picture with the highest definition;

Wherein, the method for obtaining the picture with the highest defined definition may be by obtaining the imaging modulation transfer function value of the collected picture, and evaluating the definition of the collected picture by the imaging modulation transfer function value of the collected picture. When the imaging modulation transfer function value is the highest, the definition of the collected picture is higher.

S330: Acquire a first virtual image distance and a second virtual image distance according to the collected picture with the highest definition;

S340. Obtain the first height value according to the first virtual image distance and obtain the second height value according to the second virtual image distance.

Wherein, the controller controls the acquisition unit to continuously scan and take pictures of the first optical signal passing through the first mark and the second optical signal of the second mark, and record the data corresponding to the collected picture The control focal length of the acquisition unit. According to the clarity of the acquired multiple captured pictures, determine the captured picture with the highest resolution; finally, obtain the first virtual image distance and the second virtual image distance according to the captured picture with the highest resolution .

In specific embodiments, the acquisition unit is a CCD camera, the acquisition unit includes a sensor, a lens module, and a control unit, wherein the sensor is a CCD image sensor, and the CCD image sensor can receive optical signals in a specified direction, Therefore, when the acquisition unit acquires the first optical signal and the second optical signal, the acquisition unit needs to be rotated to the same direction as the optical signal. Preferably, since the distance between the test marks is associated with the inclination angle of the acquisition unit, when the first separation distance and the second separation distance are not equal, the acquisition unit is performing different tests It is required to adjust different tilt angles when testing. When the first separation distance is equal to the second separation distance, when the acquisition unit tests different test marks, the inclination angles of the acquisition unit and the plane where the display screen is located are equal, and the acquisition unit The unit can rotate with only the normal of the display screen as the rotation axis, which can reduce the number of angle adjustments of the acquisition unit and avoid the optical system from adjusting the angle of the acquisition unit multiple times during the angle measurement process.

It is understandable that, in another embodiment, there may be multiple collection units, the multiple collection units have the same inclination angle with the normal direction of the display screen, and each collection unit faces a different direction. The test mark. Through the common measurement of multiple acquisition units, the number of rotations of the acquisition unit when measuring the angle between the lens and the display screen is reduced, and the angle error generated when the acquisition unit is rotated is reduced.

It can be understood that, in another embodiment, the collection unit is provided on the side of the lens away from the display screen. Preferably, the collection unit is provided at the exit pupil center or the aperture center of the lens. .

Please refer to FIG. 4, specifically, the step S340 includes:

S341: Establish a functional relationship between the virtual image distance and the height value;

S342: Obtain the first height value according to the functional relationship and the first virtual image distance, and obtain the second height value according to the functional relationship and the second virtual image distance.

In some optional implementations, when the distance between the lens and the display screen is greater, the virtual image distance is greater, and the distance between the lens and the display screen has a positive correlation with the virtual image distance, Therefore, the first height value may be obtained through the first virtual image distance and the function relationship, and the second height value may be obtained through the second virtual image distance and the function relationship.

Referring to FIG. 5, in some optional implementation manners, the S400 step includes:

S410. Acquire a first height difference value between the first height value and the second height value;

Wherein, the first height difference is an absolute value after subtracting the first height value and the second height value.

S420: Acquire a first ratio value of the first height difference value and the first separation distance;

S430: Obtain the arc tangent function value of the first scale value, and obtain the first included angle according to the arc tangent function value of the first scale value.

Wherein, the optical system obtains the first height value a1, the second height value a2, and the first separation distance is set to H1, then the lens along the first direction in the first direction An included angle α is

Please refer to FIG. 6, in some optional implementation manners, the step S800 includes:

S810: Acquire a second height difference value between the third height value and the fourth height value;

Wherein, the second height difference is an absolute value after subtracting the third height value and the fourth height value.

S820: Acquire a second ratio value of the second height difference value and the second separation distance;

S830: Obtain the arc tangent function value of the second proportional value, and obtain the second included angle according to the arc tangent function value of the second proportional value.

Wherein, for the third height value a3 and the fourth height value a4, if the second separation distance is H2, then the second angle β of the lens along the second direction is

In some optional implementation manners, the S900 step includes:

Said obtaining a first normal vector and a second normal vector of the plane where it is located according to the first direction vector and the second direction vector;

The third included angle is obtained according to the first normal vector and the second normal vector.

Specifically, when the first direction and the second direction are perpendicular to each other, and the first separation distance is equal to the second separation distance, the first included angle α is

The second included angle β is

The normal vector of the plane where the lens is located is (1, tanα/tanβ, tanα);

Then calculate the angle between the lens and the display screen according to the vector as

In order to achieve the above objective, the present application also proposes an angle measuring device applied to an optical system, the optical system includes a lens and a display screen, the display screen includes a test mark, and the test mark includes a first mark and a second mark The angle measuring device applied to the optical system includes a collection unit and a controller, wherein the controller is used to obtain a first separation distance between the first mark and the second mark; the collection unit is located at the The lens is far away from the display screen, and is used to obtain the optical signal of the test mark; the acquisition unit sends the optical signal to the controller, and the controller is also used to obtain the optical signal according to the first The optical signal obtains a first height value and obtains a second height value according to the second optical signal, and obtains the lens and the lens according to the first height value, the second height value, and the first separation distance. The first angle of the display.

Wherein, the controller includes a processor, a memory, and a computer program that is stored on the memory and can run on the processor. When the computer program is executed by the processor, it also implements any of the above The steps of the control method described in the method.

In some optional implementation manners, the processor may be a central processing unit (Central Processing Unit, CPU), or may be other general-purpose processors, digital signal processors (Digital Signal Processors, DSPs), and application-specific integrated circuits ( Application Specific Integrated Circuit (ASIC), Field-Programmable Gate Array (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor or the like.

The memory may be an internal storage unit of the device, such as the hard disk or memory of the device. The memory may also be an external storage device of the device, such as a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a Secure Digital (SD) card, a flash memory card (Flash Card), etc. equipped on the device . Further, the memory may also include both an internal storage unit of the device and an external storage device. The memory is used to store the computer program and other programs and data required by the device. The memory can also be used to temporarily store data that has been output or will be output.

Those skilled in the art can clearly understand that for the convenience and conciseness of description, only the division of the above-mentioned functional units and modules is used as an example. In practical applications, the above-mentioned functions can be allocated to different functional units and modules as required. Module completion means dividing the internal structure of the device into different functional units or modules to complete all or part of the functions described above. The functional units and modules in the embodiments can be integrated into one processing unit, or each unit can exist alone physically, or two or more units can be integrated into one unit. The above-mentioned integrated units can be hardware-based Form realization can also be realized in the form of software functional unit. In addition, the specific names of each functional unit and module are only for the convenience of distinguishing each other and are not used to limit the scope of protection of this application. For the specific working process of the units and modules in the foregoing system, reference may be made to the corresponding process in the foregoing method embodiment, which is not repeated here.

In some optional implementations, the collection unit includes: a lens module for receiving the light emitted by the test mark and focusing the light; a sensor for receiving the light emitted by the test mark and passing through the Optical signal of light focused by the lens module; a control unit for adjusting the distance between the lens module and the sensor, and controlling the sensor to perform continuous picture collection on the optical signal. In specific embodiments, the control unit continuously adjusts the distance between the lens module and the sensor; during the adjustment process, the controller performs continuous pictures of the first optical signal and the second optical signal Collect and correlate the definition of the collected picture with the virtual image distance, the controller screens out the collected picture with the highest definition, and uses the virtual image distance of the collected picture as the virtual image distance corresponding to the test mark.

The above are only the preferred embodiments of this application, and do not therefore limit the scope of the patent of this application. Under the inventive concept of this application, any equivalent structural transformation made by using the content of the specification and drawings of this application, or direct/indirect use Other related technical fields are included in the scope of patent protection of this application.

Claims

An angle measurement method applied to an optical system, wherein the optical system includes a lens and a display screen, the display screen includes a test mark, and the test mark includes the center of the display screen as the center and along the first The first mark and the second mark are arranged symmetrically; the angle measurement method applied to the optical system includes:

Acquiring a first separation distance between the first indicator and the second indicator;

Acquiring the first optical signal of the first label and the second optical signal of the second label;

Obtaining a first height value according to the first optical signal and obtaining a second height value according to the second optical signal;

The first angle between the lens and the display screen is obtained according to the first height value, the second height value, and the first separation distance.
The angle measurement method applied to an optical system according to claim 1, wherein the test mark further comprises a third mark and a fourth mark that are symmetrically arranged along a second direction with the center of the display screen as the center, Wherein, the first direction and the second direction intersect and are both parallel to the display screen, and the angle measurement method applied to the optical system further includes:

Acquiring a second separation distance between the third indicator and the fourth indicator;

Acquiring the third optical signal of the third label and the fourth optical signal of the fourth label;

Obtaining a third height value according to the third optical signal and obtaining a fourth height value according to the fourth optical signal;

Obtaining a second included angle between the lens and the display screen according to the third height value and the fourth height value;

A third included angle between the lens and the display screen is obtained according to the first included angle and the second included angle.
3. The angle measurement method applied to an optical system according to claim 2, wherein the first direction and the second direction are perpendicular to each other.
The angle measurement method applied to an optical system according to claim 2, wherein the first separation distance is equal to the second separation distance.
The angle measurement method applied to an optical system according to claim 1, wherein the obtaining a first height value according to the first optical signal and obtaining a second height value according to the second optical signal comprises:

Performing continuous picture collection on the first optical signal and the second optical signal;

Acquiring the clarity of a plurality of the collected pictures, and determining the collected picture with the highest definition;

Acquiring the first virtual image distance and the second virtual image distance according to the collected picture with the highest definition;

The first height value is obtained according to the first virtual image distance and the second height value is obtained according to the second virtual image distance.
The angle measurement method applied to an optical system according to claim 5, wherein the first height value is obtained according to the first virtual image distance and the second height is obtained according to the second virtual image distance Values include:

Establish the functional relationship between virtual image distance and height;

The first height value is obtained according to the functional relationship and the first virtual image distance, and the second height value is obtained according to the functional relationship and the second virtual image distance.
5. The angle measurement method applied to an optical system according to claim 1, wherein said lens and said lens are obtained according to said first height value, said second height value and said first separation distance. The first angle of the display, including:

Acquiring a first height difference between the first height value and the second height value;

Acquiring a first ratio value of the first height difference value and the first separation distance;

The arc tangent function value of the first proportional value is obtained, and the first included angle is obtained according to the arc tangent function value of the first proportional value.
The angle measurement method applied to an optical system according to claim 2, wherein the second included angle between the lens and the display screen is obtained according to the third height value and the fourth height value ,include:

Acquiring a second height difference between the third height value and the fourth height value;

Acquiring a second ratio value of the second height difference value and the second separation distance;

The arc tangent function value of the second proportional value is obtained, and the second included angle is obtained according to the arc tangent function value of the second proportional value.
The angle measurement method applied to the optical system according to claim 2, wherein the first plane is parallel to the first direction and perpendicular to the plane where the display screen is located, and the second plane is parallel to the second plane. The direction is parallel and perpendicular to the plane where the display screen is located, and the obtaining a third included angle between the lens and the display screen according to the first included angle and the second included angle includes:

Obtaining a first direction vector on the first plane according to the first included angle;

Obtaining a second direction vector on the second plane according to the second included angle;

The third included angle is obtained according to the first direction vector and the second direction vector.
An angle measuring device applied to an optical system, characterized in that the optical system includes a lens and a display screen, the display screen includes a test mark, and the test mark includes a first mark and a second mark; The angle measuring device of the optical system includes a collection unit and a controller, wherein the controller is used to obtain a first separation distance between the first mark and the second mark; the collection unit is located at a distance away from the lens One side of the display screen is used to obtain the optical signal of the test mark; the acquisition unit sends the optical signal to the controller, and the controller is also used to obtain the first optical signal according to the first optical signal. Height value and obtaining a second height value according to the second optical signal, and obtaining a first height value between the lens and the display screen according to the first height value, the second height value, and the first separation distance Angle.
The angle measuring device applied to an optical system according to claim 10, wherein the collecting unit comprises:

The lens module is used to receive the light emitted by the test mark and focus the light;

Sensor for receiving the optical signal of the light emitted by the test mark and focused by the lens module; wherein the optical signal includes the first optical signal of the first mark and the optical signal of the second mark The second optical signal;

The control unit is used for adjusting the distance between the lens module and the sensor, and controlling the sensor to perform continuous picture collection on the optical signal.