Optical alignment device and optical alignment method

Abstract

The invention discloses an optical alignment device and an optical alignment method. The optical alignment device is used for aligning a first optical axis of a first optical element and a second optical axis of a second optical element. The optical alignment device comprises a first six-axis displacement table, a light emitting and receiving mechanism and a supporting frame. The first six-axis displacement table is used for bearing the first optical element. The light emitting and receiving mechanism is arranged above the first six-axis displacement table; the supporting frame is used for bearing the second optical element, the second optical element and the first optical element are oppositely arranged, and the second optical element is located between the light emitting and receiving mechanism and the first optical element.

Description

Technical Field

[0001] The present application relates to the field of optical detection technology, and more specifically, to an optical alignment device and an optical alignment method. Background Art

[0002] Active alignment (AA) of optical modules is a key step in lens module assembly. The quality of active alignment will directly affect the imaging quality of the system. The current active alignment of lenses is mainly achieved by scanning multiple fields of view to find the best imaging surface. This process requires calibration and measurement of multiple fields of view, and monitoring of multiple fields of view. Since there are certain differences in the detection of different fields of view, this method has extremely high requirements for the calibration of different fields of view, and the operation of this method is relatively complicated.

[0003] In view of this, it is necessary to provide a new technical solution to solve the above technical problems. Summary of the invention

[0004] One object of the present application is to provide a new technical solution for an optical alignment device and an optical alignment method.

[0005] According to a first aspect of the present application, an optical alignment device is provided, the optical alignment device being used to align a first optical axis of a first optical element and a second optical axis of a second optical element;

[0006] The optical alignment device comprises:

[0007] A first six-axis translation stage, wherein the first six-axis translation stage is used to carry the first optical element;

[0008] A light emitting and receiving mechanism, wherein the light emitting and receiving mechanism is arranged above the first six-axis translation stage;

[0009] A support frame, wherein the support frame is used to carry the second optical element, the second optical element is arranged opposite to the first optical element, and the second optical element is located between the light emitting and receiving mechanism and the first optical element.

[0010] Optionally, the optical alignment device further includes a rotating table, the first six-axis translation table and the support frame are both mounted on the rotating table, and the rotating table can rotate around a first direction.

[0011] Optionally, the optical alignment device further includes a second six-axis translation platform, the second six-axis translation platform is mounted on the supporting frame, and the second optical element is disposed on the second six-axis translation platform.

[0012] Optionally, the optical alignment device further comprises a first switching mechanism, wherein the first switching mechanism is connected to the light emitting and receiving mechanism;

[0013] The first switching mechanism is provided with a first light-through hole and at least one lens. The first light-through hole and any one of the lenses can be moved in the first switching mechanism to switch the positions of the first light-through hole and the lens so that the first light-through hole or any one of the lenses corresponds to the light emitting and receiving mechanism.

[0014] Optionally, the optical alignment device further comprises a motion axis, the light emitting and receiving mechanism is mounted on the motion axis, and the motion axis can drive the light emitting and receiving mechanism to perform translational movement along a first direction.

[0015] Optionally, the light emitting and receiving mechanism is an autocollimator.

[0016] According to a second aspect of the present application, an optical alignment method is provided, using the optical alignment device as described in the first aspect, the optical alignment method comprising:

[0017] Controlling the light emitting and receiving mechanism to emit outgoing light;

[0018] The emitted light generates reflected light after passing through the first optical element and is received by the light emitting and receiving mechanism, and the first optical axis or the first optical axis direction of the first optical element is obtained according to the reflected light of the first optical element;

[0019] The outgoing light generates reflected light after passing through the second optical element and is received by the light emitting and receiving mechanism, and the second optical axis or the second optical axis direction of the second optical element is obtained according to the reflected light of the second optical element;

[0020] The first optical axis and the second optical axis are aligned according to the first optical axis or the first optical axis direction, and the second optical axis or the second optical axis direction.

[0021] Optionally, the first optical element is a display screen or an image sensor, and the first optical element includes a first reflective surface;

[0022] The obtaining the first optical axis or the first optical axis direction of the first optical element according to the reflected light of the first optical element specifically includes:

[0023] A reflected light of the first reflecting surface is obtained, and an eccentricity of the first reflecting surface is obtained according to the reflected light; and a first optical axis direction of the first optical element is obtained according to the eccentricity of the first reflecting surface.

[0024] Optionally, the second optical element is a lens group, and the second optical element includes at least two second reflective surfaces;

[0025] The obtaining the second optical axis or the second optical axis direction of the second optical element according to the reflected light of the second optical element specifically includes:

[0026] Respectively obtain reflected light from each of the second reflecting surfaces, and obtain the eccentricity of the second reflecting surface corresponding to the reflected light according to the reflected light;

[0027] The second optical axis of the second optical element is obtained according to the eccentricity of each of the second reflecting surfaces.

[0028] Optionally, when the first optical element is a display screen, aligning the first optical axis and the second optical axis according to the first optical axis direction and the second optical axis specifically includes:

[0029] Adjusting the posture of the display screen by using the first six-axis translation stage to adjust the direction of the first optical axis to be parallel to the second optical axis;

[0030] Adjusting the light emitting and receiving mechanism to align with an ideal image plane or object plane of the second optical element;

[0031] The display screen is controlled to project a target image, and the posture of the display screen is adjusted by the first six-axis translation stage so that the target image is clearly imaged at the center of the light emitting and receiving mechanism.

[0032] Optionally, in the case where the first optical element is an image sensor, aligning the first optical axis and the second optical axis according to the first optical axis direction and the second optical axis specifically includes:

[0033] Adjusting the posture of the image sensor by using the first six-axis translation stage to adjust the direction of the first optical axis to be parallel to the second optical axis;

[0034] Adjusting the light emitting and receiving mechanism to align with an ideal image plane or object plane of the second optical element;

[0035] The image sensor is controlled to collect the target image projected by the light emitting and receiving mechanism in real time, and the posture of the image sensor is adjusted by the first six-axis translation stage so that the target image is clearly imaged at the center of the image sensor.

[0036] The optical alignment device provided in the embodiment of the present application can realize the eccentricity measurement of the first optical element and the second optical element, and further guide the first optical axis of the first optical element and the second optical axis of the second optical element to be actively aligned through the eccentricity measurement result; there is no need to detect multiple fields of view, the operation process is relatively simple, and high-precision optical active alignment can be achieved.

[0037] Other features and advantages of the present application will become apparent from the following detailed description of exemplary embodiments of the present application with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] The accompanying drawings, which are incorporated in and constitute a part of the specification, illustrate embodiments of the application and, together with the description, serve to explain the principles of the application.

[0039] Figure 1 Shown is a schematic structural diagram of an optical alignment device of the present application.

[0040] Description of reference numerals:

[0041] 11. First six-axis displacement platform; 12. Light emitting and receiving mechanism; 13. Support frame; 14. Rotating platform; 15. Second six-axis displacement platform; 16. First switching mechanism; 160. First light hole; 161. Lens; 17. Moving axis;

[0042] 01. First optical element; 02. Second optical element. DETAILED DESCRIPTION

[0043] Various exemplary embodiments of the present application will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present application.

[0044] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present application, its application, or uses.

[0045] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered as part of the specification.

[0046] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0047] It should be noted that like reference numerals and letters refer to similar items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0048] Reference Figure 1 As shown, according to one embodiment of the present application, an optical alignment device is provided, wherein the optical alignment device is used to align a first optical axis of a first optical element 01 and a second optical axis of a second optical element 02;

[0049] The optical alignment device comprises a first six-axis translation stage 11, a light emitting and receiving mechanism 12 and a support frame 13. The first six-axis translation stage 11 is used to carry the first optical element 01; the light emitting and receiving mechanism 12 is arranged above the first six-axis translation stage 11;

[0050] The support frame 13 is used to carry the second optical element 02 . The second optical element 02 is arranged opposite to the first optical element 01 , and the second optical element 02 is located between the light emitting and receiving mechanism 12 and the first optical element 01 .

[0051] The optical alignment device provided in the embodiment of the present application can achieve precise alignment of the first optical axis of the first optical element 01 and the second optical axis of the second optical element 02.

[0052] In the optical alignment device provided in the embodiment of the present application, the first six-axis displacement stage 11 is used to carry the first optical element 01. Through the precise adjustment of six axes (i.e., three translation axes and three rotation axes), the posture of the first optical element 01 can be controlled and adjusted in all directions. The light emitting and receiving mechanism 12 is arranged above the first six-axis displacement stage 11, and is used to emit outgoing light and receive light reflected by the first optical element 01 and / or the second optical element 02. In the present embodiment, the light emitting and receiving mechanism 12 is preferably an autocollimator, which has the characteristics of high precision and high sensitivity and is very suitable for optical alignment. The support frame 13 is used to carry the second optical element 02, so that the second optical element 02 is arranged opposite to the first optical element 01, and is located between the light emitting and receiving mechanism 12 and the first optical element 01.

[0053] The optical alignment device provided in the embodiment of the present application can realize the eccentricity measurement of the first optical element 01 and the second optical element 02, and further guide the first optical axis of the first optical element 01 and the second optical axis of the second optical element 02 to be actively aligned through the eccentricity measurement result; there is no need to detect multiple fields of view, the operation process is relatively simple, and high-precision optical active alignment can be achieved.

[0054] The specific types of the first optical element 01 and the second optical element 02 can be selected according to the actual application; for example, they can be display screens, image sensors, lenses or lens modules, etc. In addition, the optical element that needs to be adjusted in posture is carried on the first six-axis translation stage 11 as the first optical element 01, and the other optical element is carried on the support frame 13 as the second optical element 02.

[0055] Reference Figure 1As shown, in one embodiment, the optical alignment device further includes a rotating platform 14, the first six-axis translation platform 11 and the support frame 13 are both mounted on the rotating platform 14, and the rotating platform 14 can rotate around a first direction.

[0056] In this specific example, the first optical element 01 can be measured while rotating by the rotation of the rotating table 14, so as to more accurately measure the eccentricity of the first reflection surface; and the second optical element 02 can be measured while rotating by the rotation of the rotating table 14, so as to more accurately measure the eccentricity of the second reflection surface. Optionally, the rotating table 14 is an air-floating rotating table.

[0057] Reference Figure 1 As shown, in one embodiment, the optical alignment device further includes a second six-axis translation platform 15 , the second six-axis translation platform 15 is mounted on the support frame 13 , and the second optical element 02 is disposed on the second six-axis translation platform 15 .

[0058] In this specific example, by providing the second six-axis translation stage 15, the posture of the second optical element 02 can be adjusted, so that the process of aligning the first optical axis of the first optical element 01 and the second optical axis of the second optical element 02 is more flexible and easy to control.

[0059] Reference Figure 1 As shown, in one embodiment, the optical alignment device further includes a first switching mechanism 16, and the first switching mechanism 16 is connected to the light emitting and receiving mechanism 12;

[0060] The first switching mechanism 16 is provided with a first light-through hole 160 and at least one lens 161. The first light-through hole 160 and any one of the lenses 161 can be moved in the first switching mechanism 16 to switch the positions of the first light-through hole 160 and the lens 161 so that the first light-through hole 160 or any one of the lenses 161 corresponds to the light emitting and receiving mechanism 12.

[0061] In this specific example, the positions of the first light hole 160 and the lens 161 can be switched by the first switching mechanism 16, so that the first light hole 160 or any lens 161 is located in the optical path system to adapt to first optical elements 01 and second optical elements 02 of different types or parameters.

[0062] Reference Figure 1 As shown, in one embodiment, the optical alignment device further includes a motion axis 17, and the light emitting and receiving mechanism 12 is installed on the motion axis 17, and the motion axis 17 can drive the light emitting and receiving mechanism 12 to translate along the first direction.

[0063] In this specific example, according to measurement requirements, the light emitting and receiving mechanism 12 can be translated along the first direction through the moving axis 17; for example, when measuring the eccentricity of the first reflecting surface of the first optical element 01, the light emitting and receiving mechanism 12 is located at one position on the moving axis 17; when measuring the eccentricity of the second reflecting surface of the second optical element 02, the light emitting and receiving mechanism 12 is located at another position on the moving axis 17.

[0064] According to another embodiment of the present application, an optical alignment method is provided, which uses the optical alignment device as described above, and the optical alignment method includes:

[0065] S101, controlling the light emitting and receiving mechanism 12 to emit outgoing light;

[0066] S102, the emitted light generates reflected light after passing through the first optical element 01 and is received by the light emitting and receiving mechanism 12, and the first optical axis or the first optical axis direction of the first optical element 01 is obtained according to the reflected light of the first optical element 01;

[0067] S103, the emitted light generates reflected light after passing through the second optical element 02 and is received by the light emitting and receiving mechanism 12, and the second optical axis or the second optical axis direction of the second optical element 02 is obtained according to the reflected light of the second optical element 02;

[0068] S104, aligning the first optical axis and the second optical axis according to the first optical axis or the direction of the first optical axis, and the second optical axis or the direction of the second optical axis.

[0069] In the optical alignment method provided in the embodiment of the present application, in step S101, the light emitting and receiving mechanism 12 is turned on to emit an outgoing light.

[0070] In step S102, the position of the light emitting and receiving mechanism 12 is adjusted until the reflected light generated by the first optical element 01 is clearly imaged; for example, the light emitting and receiving mechanism 12 is adjusted to the first position through the moving axis 17; when the first switching mechanism 16 is included and the lens 161 is moved to the optical path system, the lens 161 can also be adjusted to make the reflected light generated by the first optical element 01 clearly imaged; then, the first optical axis or the first optical axis direction of the first optical element 01 is obtained according to the reflected light of the first optical element 01.

[0071] In step S103, the position of the light emitting and receiving mechanism 12 is adjusted until the reflected light generated by the second optical element 02 is clearly imaged; for example, the light emitting and receiving mechanism 12 is adjusted to the second position through the moving axis 17; in the case where the first switching mechanism 16 is included and the lens 161 is moved to the optical path system, the lens 161 can also be adjusted to make the reflected light generated by the second optical element 02 clearly imaged; then the second optical axis or the second optical axis direction of the second optical element 02 is obtained according to the reflected light of the second optical element 02.

[0072] In step S104, the first optical axis and the second optical axis are aligned according to the acquired first optical axis or the first optical axis direction, and the second optical axis or the second optical axis direction. For example, the posture of the first optical element 01 is adjusted by the first six-axis translation stage 11 to align the first optical axis and the second optical axis.

[0073] The optical alignment method provided in the embodiment of the present application can realize the eccentricity measurement of the first optical element 01 and the second optical element 02, and further guide the first optical axis of the first optical element 01 and the second optical axis of the second optical element 02 to be actively aligned through the eccentricity measurement result; there is no need to detect multiple fields of view, the operation process is relatively simple, and high-precision optical active alignment can be achieved.

[0074] Reference Figure 1 As shown, in one embodiment, the first optical element 01 is a display screen or an image sensor, and the first optical element 01 includes a first reflective surface;

[0075] The obtaining the first optical axis or the first optical axis direction of the first optical element 01 according to the reflected light of the first optical element 01 specifically includes:

[0076] A reflected light of the first reflecting surface is obtained, and an eccentricity of the first reflecting surface is obtained according to the reflected light; and a first optical axis direction of the first optical element 01 is obtained according to the eccentricity of the first reflecting surface.

[0077] In this specific example, the first optical element 01 is a display screen or an image sensor, which usually has only one reflective surface, which is called the first reflective surface; the position of the light emitting and receiving mechanism 12 is adjusted until the reflected light from the first reflective surface is clearly imaged; in order to more accurately measure the eccentricity of the first reflective surface, the first optical element 01 can be measured while rotating by the rotation of the rotating table 14; then the first optical axis direction of the first optical element 01 is calculated by the eccentricity of the first reflective surface.

[0078] Reference Figure 1As shown, in one embodiment, the second optical element 02 is a lens group, and the second optical element 02 includes at least two second reflective surfaces;

[0079] The obtaining the second optical axis or the second optical axis direction of the second optical element 02 according to the reflected light of the second optical element 02 specifically includes:

[0080] Respectively obtain reflected light from each of the second reflecting surfaces, and obtain the eccentricity of the second reflecting surface corresponding to the reflected light according to the reflected light;

[0081] The second optical axis of the second optical element 02 is obtained according to the eccentricity of each of the second reflecting surfaces.

[0082] In this specific example, the second optical element 02 is a lens group, which can be a lens module including multiple lenses or a single lens; the lens group usually has at least two reflective surfaces, and any reflective surface of the lens group is referred to as a second reflective surface; first, the position of the light emitting and receiving mechanism 12 is adjusted to a clear image of the reflected light of one of the second reflective surfaces to measure the eccentricity of the second reflective surface; then, the eccentricity of the remaining second reflective surfaces is measured in turn according to the same method. In order to more accurately measure the eccentricity of the second reflective surface, the second optical element 02 can be measured while rotating by the rotation of the rotating table 14; then, the second optical axis of the second optical element 02 is calculated by the eccentricity of all the second reflective surfaces.

[0083] Reference Figure 1 As shown, in one embodiment, when the first optical element 01 is a display screen, aligning the first optical axis and the second optical axis according to the first optical axis direction and the second optical axis specifically includes:

[0084] The posture of the display screen is adjusted by the first six-axis translation stage 11, and the direction of the first optical axis is adjusted to be parallel to the second optical axis;

[0085] Adjusting the light emitting and receiving mechanism 12 to align with the ideal image plane or object plane of the second optical element 02;

[0086] The display screen is controlled to project a target image, and the posture of the display screen is adjusted by the first six-axis translation stage 11 so that the target image is clearly imaged at the center of the light emitting and receiving mechanism 12 .

[0087] In this specific example, the first optical element 01 is a display screen; first, the posture of the display screen is adjusted by the first six-axis translation stage 11 so that the first optical axis is parallel to the second optical axis, and the first optical axis and the second optical axis have not overlapped yet; then, the light emitting and receiving mechanism 12 is adjusted so that the light converges on the ideal image plane or object plane of the second optical element 02, so that the first optical element 01 is clearly imaged in the light emitting and receiving mechanism 12 through the second optical element 02; then, the light source of the light emitting and receiving mechanism 12 is turned off and the camera of the light emitting and receiving mechanism 12 is kept turned on, and the display screen is turned on to display a target image, for example, a cross-shaped target image, and the target image is used to represent the center of the display screen; then, the position of the target image is obtained by using the camera of the light emitting and receiving mechanism 12, and the display screen is adjusted by the first six-axis translation stage 11 until the target image is clearly imaged at the center of the camera of the light emitting and receiving mechanism 12, that is, the active alignment of the first optical axis and the second optical axis is completed.

[0088] Reference Figure 1 As shown, in one embodiment, when the first optical element 01 is an image sensor, aligning the first optical axis and the second optical axis according to the first optical axis direction and the second optical axis specifically includes:

[0089] Adjusting the posture of the image sensor by using the first six-axis translation stage 11, and adjusting the direction of the first optical axis to be parallel to the second optical axis;

[0090] Adjusting the light emitting and receiving mechanism 12 to align with the ideal image plane or object plane of the second optical element 02;

[0091] The image sensor is controlled to collect the target image projected by the light emitting and receiving mechanism 12 in real time, and the posture of the image sensor is adjusted by the first six-axis translation stage 11 so that the target image is clearly imaged at the center of the image sensor.

[0092] In this specific example, the first optical element 01 is an image sensor; first, the posture of the image sensor is adjusted by the first six-axis translation stage 11 so that the direction of the first optical axis is parallel to the second optical axis, and at this time, the first optical axis and the second optical axis have not overlapped yet; then, the light emitting and receiving mechanism 12 is adjusted so that the light converges on the ideal image plane or object plane of the second optical element 02, so that the first optical element 01 is clearly imaged in the light emitting and receiving mechanism 12 through the second optical element 02; then, the camera of the light emitting and receiving mechanism 12 is turned off and the light source of the light emitting and receiving mechanism 12 is kept on, the real-time sampling function of the image sensor is turned on, and the deviation degree of the center of the image sensor is calculated through the position of the target image projected by the light emitting and receiving mechanism 12 on the image sensor, and the posture of the image sensor is adjusted by the first six-axis translation stage 11. When the target image is clearly located at the center of the image sensor, the active alignment of the first optical axis and the second optical axis is completed.

[0093] When the posture of the first optical element 01 is adjusted by the first six-axis translation stage 11, adjustments along the first direction, the second direction and the third direction are included; Figure 1 As shown, the first direction is Figure 1 The a direction in the second direction is Figure 1 The b direction in the figure is Figure 1 The c direction in .

[0094] In addition, a reference axis can be selected, for example, the rotation center axis of the rotating table 14 is used as the reference axis, and then the posture of the second optical element 02 is adjusted by the second six-axis displacement table 15, and the second optical axis is adjusted to coincide with the reference axis; and then the posture of the first optical element 01 is adjusted by the first six-axis displacement table 11, and the direction of the first optical axis is adjusted to be parallel to the reference axis.

[0095] Although some specific embodiments of the present application have been described in detail by way of example, it should be understood by those skilled in the art that the above examples are only for illustration, not for limiting the scope of the present application. It should be understood by those skilled in the art that the above embodiments may be modified without departing from the scope and spirit of the present application. The scope of the present application is defined by the appended claims.

Claims

1. An optical alignment device, characterized in that: The optical alignment device is used to align a first optical axis of a first optical element (01) and a second optical axis of a second optical element (02); The optical alignment device comprises: A first six-axis translation platform (11), wherein the first six-axis translation platform (11) is used to carry the first optical element (01); A light emitting and receiving mechanism (12), wherein the light emitting and receiving mechanism (12) is arranged above the first six-axis translation platform (11); A support frame (13), the support frame (13) being used to carry the second optical element (02), the second optical element (02) being arranged opposite to the first optical element (01), and the second optical element (02) being located between the light emitting and receiving mechanism (12) and the first optical element (01).

2. The optical alignment device according to claim 1, characterized in that: The optical alignment device also includes a rotating platform (14), the first six-axis displacement platform (11) and the support frame (13) are both mounted on the rotating platform (14), and the rotating platform (14) is capable of rotating around a first direction.

3. The optical alignment device according to claim 2, characterized in that: The optical alignment device also includes a second six-axis translation platform (15), wherein the second six-axis translation platform (15) is mounted on the support frame (13), and the second optical element (02) is arranged on the second six-axis translation platform (15).

4. The optical alignment device according to claim 1, characterized in that: The optical alignment device further comprises a first switching mechanism (16), wherein the first switching mechanism (16) is connected to the light emitting and receiving mechanism (12); The first switching mechanism (16) is provided with a first light-through hole (160) and at least one lens (161); the first light-through hole (160) and any one of the lenses (161) are capable of moving in the first switching mechanism (16) to switch the positions of the first light-through hole (160) and the lens (161) so that the first light-through hole (160) or any one of the lenses (161) corresponds to the light emitting and receiving mechanism (12).

5. The optical alignment device according to claim 1 or 4, characterized in that: The optical alignment device also includes a motion shaft (17), the light emitting and receiving mechanism (12) is mounted on the motion shaft (17), and the motion shaft (17) can drive the light emitting and receiving mechanism (12) to perform translational movement along a first direction.

6. The optical alignment device according to claim 1, characterized in that: The light emitting and receiving mechanism (12) is an autocollimator.

7. An optical alignment method, characterized in that: Using the optical alignment device according to any one of claims 1 to 6, the optical alignment method comprises: Controlling the light emitting and receiving mechanism (12) to emit outgoing light; The emitted light generates reflected light through the action of the first optical element (01) and is received by the light emitting and receiving mechanism (12), and the first optical axis or the first optical axis direction of the first optical element (01) is obtained according to the reflected light of the first optical element (01); The emitted light generates reflected light through the action of the second optical element (02) and is received by the light emitting and receiving mechanism (12), and the second optical axis or the second optical axis direction of the second optical element (02) is obtained according to the reflected light of the second optical element (02); The first optical axis and the second optical axis are aligned according to the first optical axis or the first optical axis direction, and the second optical axis or the second optical axis direction.

8. The optical alignment method according to claim 7, characterized in that: The first optical element (01) is a display screen or an image sensor, and the first optical element (01) comprises a first reflective surface; The step of obtaining the first optical axis or the first optical axis direction of the first optical element (01) according to the reflected light of the first optical element (01) specifically comprises: A reflected light from the first reflecting surface is obtained, and the eccentricity of the first reflecting surface is obtained according to the reflected light; and a first optical axis direction of the first optical element (01) is obtained according to the eccentricity of the first reflecting surface.

9. The optical alignment method according to claim 8, characterized in that: The second optical element (02) is a lens group, and the second optical element (02) comprises at least two second reflective surfaces; The step of obtaining the second optical axis or the second optical axis direction of the second optical element (02) according to the reflected light of the second optical element (02) specifically comprises: Respectively obtain reflected light from each of the second reflecting surfaces, and obtain the eccentricity of the second reflecting surface corresponding to the reflected light according to the reflected light; The second optical axis of the second optical element (02) is obtained according to the eccentricity of each of the second reflecting surfaces.

10. The optical alignment method according to claim 9, characterized in that: When the first optical element (01) is a display screen, aligning the first optical axis and the second optical axis according to the first optical axis direction and the second optical axis specifically includes: The posture of the display screen is adjusted by using the first six-axis displacement platform (11) to adjust the direction of the first optical axis to be parallel to the second optical axis; Adjusting the light emitting and receiving mechanism (12) to align with an ideal image plane or object plane of the second optical element (02); The display screen is controlled to project a target image, and the posture of the display screen is adjusted by the first six-axis displacement platform (11) so that the target image is clearly imaged at the center of the light emitting and receiving mechanism (12).

11. The optical alignment method according to claim 9, characterized in that: In the case where the first optical element (01) is an image sensor, aligning the first optical axis and the second optical axis according to the first optical axis direction and the second optical axis specifically includes: The posture of the image sensor is adjusted by the first six-axis displacement platform (11), and the direction of the first optical axis is adjusted to be parallel to the second optical axis; Adjusting the light emitting and receiving mechanism (12) to align with an ideal image plane or object plane of the second optical element (02); The image sensor is controlled to collect the target image projected by the light emitting and receiving mechanism (12) in real time, and the posture of the image sensor is adjusted by the first six-axis displacement platform (11) so that the target image is clearly imaged at the center of the image sensor.

Images