CN111998796A

CN111998796A - Assembly and method for multi-layer optical scanning device

Info

Publication number: CN111998796A
Application number: CN202010973566.8A
Authority: CN
Inventors: 石国杰; 李商羽; 李毅
Original assignee: Harbin Institute Of Technology Robot (yueyang) Military And Civilian Integration Research Institute
Current assignee: Harbin Institute Of Technology Robot (yueyang) Military And Civilian Integration Research Institute
Priority date: 2020-09-16
Filing date: 2020-09-16
Publication date: 2020-11-27

Abstract

The invention provides a regulating component and a regulating method of a multilayer optical scanning device. The assembly and adjustment component of the multilayer optical scanning device comprises a projection line marking plate, an optical platform, a collimator, an infrared camera and a display. The multilayer optical scanning device to be adjusted in scanning layer angle is installed on the optical platform, and the rotation center of the multilayer optical scanning device is coaxial with the light emitted by the collimator. The infrared camera and the display are arranged on the optical platform and used for monitoring whether the scanning light spots of the multilayer optical scanning device coincide with the corresponding marks on the projection scribing board or not. According to the technical scheme, the projection scribing board is used as a reference for adjusting the angle of the scanning layer, the scanning light spots to be adjusted are sequentially overlapped with the corresponding marks corresponding to the projection scribing board, and then the whole adjusting work can be completed.

Description

Assembly and method for multi-layer optical scanning device

Technical Field

The invention relates to the technical field of optical sensors, in particular to an assembly and adjustment component and an assembly and adjustment method of a multilayer optical scanning device.

Background

The multilayer optical scanning device has become an important angle and distance measuring sensor device in the field of automation, and particularly in the field of unmanned automobile automatic driving, the multilayer optical scanning device has irreplaceability as a vision sensor, which also puts high requirements on the measurement accuracy of the multilayer optical scanning device.

The multilayer optical scanning device is provided with a plurality of optical transceiving components on the same rotating mechanism, each optical transceiving component comprises a laser emitting part and a laser receiving part, and the optical transceiving components and the non-rotating part of the multilayer optical scanning device are in wireless power supply and wireless radio frequency signal transmission. The inclination angles of the optical axes of the laser beams emitted by the optical transceiver modules are different from each other. After the rotating mechanism starts to rotate, the optical axis of the laser beam emitted by each optical transceiving component forms a conical scanning surface, namely a scanning layer, so that the measured environment can be scanned in a three-dimensional mode in a multi-layer conical surface mode.

The inclination angle of each optical transceiver component of the multilayer optical scanning device needs to point to a specific angle, the installation and adjustment of the angle is the most critical process in the assembly of the whole multilayer optical scanning device, and a high-grade photoelectric engineer is required to adjust the inclination angle of each optical transceiver component with the aid of a precise photoelectric instrument so as to achieve the designed angle value.

Therefore, the multilayer optical scanning device has a problem of inconvenient installation and adjustment in practical use.

Disclosure of Invention

The invention mainly aims to provide an assembly and adjustment component of a multilayer optical scanning device and an assembly and adjustment method, so as to solve the problem of inconvenient assembly and adjustment of the multilayer optical scanning device in the prior art.

In order to achieve the above object, according to one aspect of the present invention, there is provided a setup assembly of a multilayer optical scanning device, comprising: the projection scribing board is provided with a first reflector; the optical platform is arranged at intervals with the projection scribing board, and a second reflector is arranged on the optical platform; the collimator is arranged on the optical platform and is matched with the verification projection scribing board through a second reflector and a first reflector to be parallel to light rays emitted by the collimator; the multilayer optical scanning device is arranged on the optical platform, the rotating center of the multilayer optical scanning device is coaxial with the light rays emitted by the collimator, a plurality of optical transceiving components to be adjusted are arranged on the multilayer optical scanning device, the plurality of optical transceiving components are distributed layer by layer along the rotating center of the multilayer optical scanning device, and each optical transceiving component is used for forming a scanning layer; and the infrared camera and the display are arranged on the optical platform and used for monitoring whether the scanning light spots of the multilayer optical scanning device coincide with the corresponding marks on the projection scribing board or not.

In one embodiment, the setup assembly of the multi-layer optical scanning device further comprises a self-leveling laser mounted on the optical platform, the self-leveling laser being used to establish the reference level.

In one embodiment, the second mirror is positioned between the collimator and the multi-layered optical scanning device.

In one embodiment, the reflective surface of the first mirror is flush with the surface of the projected reticle.

In order to achieve the above object, according to an aspect of the present invention, there is provided a method of assembling a multilayer optical scanning device, the method being used for an assembly of the multilayer optical scanning device, the method comprising: the collimator emits calibration light, the calibration light is reflected to a first reflector on the projection scribing plate by 90 degrees through a second reflector, the first reflector reflects the calibration light to the second reflector, the second reflector reflects the calibration light to the first reflector, the first reflector reflects the calibration light to the collimator, and the projection scribing plate is adjusted until the calibration light emitted by the collimator coincides with the received calibration light; enabling one optical transceiver component in the multilayer optical scanning device to be adjusted to project a zero-degree scanning surface on a projection scribing board and mark the zero-degree scanning surface, enabling a distance p between the multilayer optical scanning device and an optical platform, enabling the other optical transceiver component of the multilayer optical scanning device to be beta in inclination angle compared with the one optical transceiver component of the multilayer optical scanning device, enabling the distance from the scanning surface of the other optical transceiver component of the multilayer optical scanning device on the projection scribing board to the zero-degree scanning surface to be L, and enabling L = tan p, and enabling the distance from the zero-degree scanning surface L on the projection scribing board to mark a preset scanning surface of the other optical transceiver component of the multilayer optical scanning device; and the other optical transceiving component of the multilayer optical scanning device projects an actual scanning surface on the projection scribing board, and the scanning light spot of the other optical transceiving component of the multilayer optical scanning device on the projection scribing board is adjusted through the infrared camera and the display, so that the scanning light spot corresponding to the actual scanning surface is superposed with the preset scanning surface.

In one embodiment, the fitting method further comprises: the optical platform and the projection scribing board are ensured to be positioned on the same horizontal plane through the self-leveling laser instrument.

In one embodiment, the fitting method includes: the rotation center of the multilayer optical scanning device is horizontally arranged with the light emitted by the collimator.

By applying the technical scheme of the invention, the projection scribing board is used as the reference for scanning layer angle adjustment, and the scanning light spots to be adjusted are sequentially superposed with the corresponding marks corresponding to the projection scribing board, so that the whole adjustment work can be completed.

In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the drawings.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the invention and together with the description serve to explain the invention and not to limit the invention. In the drawings:

FIG. 1 shows a schematic overall structural view of an embodiment of a setup assembly of a multilayer optical scanning device according to the present invention;

FIG. 2 shows a schematic view of the scanning layers of the multi-layer optical scanning device of FIG. 1;

fig. 3 shows a schematic view of a scanning layer angle calculation of the multilayer optical scanning device of fig. 2.

Detailed Description

It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict. The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.

In order to make the technical solutions of the present invention better understood, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that the terms "first," "second," and the like in the description and claims of the present invention and in the drawings described above are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the terms so used are interchangeable under appropriate circumstances for describing embodiments of the invention herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

FIG. 1 illustrates an embodiment of an assembly of a multi-layer optical scanning device of the present invention comprising a projection line marking board 10, an optical platform 20, a collimator 30, an infrared camera 50, and a display 60. The projective line board 10 is provided with a first reflector 11, the optical platform 20 is arranged at an interval with the projective line board 10, and the optical platform 20 is provided with a second reflector 21. The collimator 30 is installed on the optical platform 20, and the collimator 30 is matched with the first reflector 11 through the second reflector 21 to verify that the projected scribing board 10 is parallel to the light rays emitted by the collimator 30. The multi-layered optical scanning device 40 for adjusting the angle of the scanning layer is installed on the optical platform 20, the rotation center of the multi-layered optical scanning device 40 is coaxial with the light emitted from the collimator 30, a plurality of optical transceiving components to be adjusted are installed on the multi-layered optical scanning device 40, the plurality of optical transceiving components are distributed layer by layer along the rotation center of the multi-layered optical scanning device 40, and each optical transceiving component is used for forming a scanning layer. An infrared camera 50 and a display 60 are mounted on optical platform 20 for monitoring whether the scanning spot of multi-layer optical scanning device 40 coincides with a corresponding mark on projected reticle 10.

According to the technical scheme, the collimating light is emitted through the collimator 30, the collimating light is reflected by the second reflector 21 at an angle of 90 degrees and emitted to the first reflector 11 on the projection scribing board 10, the first reflector 11 reflects the collimating light back to the second reflector 21, the second reflector 21 reflects the collimating light back to the first reflector 11, the first reflector 11 reflects the collimating light back to the collimator 30, and the projection scribing board 10 is adjusted until the collimating light emitted by the collimator 30 is coincident with the received collimating light. If the collimated light emitted by the collimator 30 and the collimated light received by the collimator 30 coincide, it means that the collimated light emitted by the collimator 30 is parallel to the projected line marking board 10. Since the center of rotation of the multilayer optical scanning device 40 is coaxial with the light rays emitted from the collimator 30, it can be deduced that the center of rotation of the multilayer optical scanning device 40 is parallel to the projected ruled line 10. Then, one optical transceiver module in the multi-layered optical scanning apparatus 40 whose angle of the scanning layer is to be adjusted projects a zero-degree scanning surface a0 on the projection-scribing board 10 and marks a zero-degree scanning surface a0, a distance p is defined between the multi-layered optical scanning apparatus 40 and the optical platform 20, an inclination angle of the other optical transceiver module of the multi-layered optical scanning apparatus 40 with respect to the one optical transceiver module of the multi-layered optical scanning apparatus 40 is β, a distance L = tan β × p is defined between a scanning surface of the other optical transceiver module of the multi-layered optical scanning apparatus 40 on the projection-scribing board 10 and the zero-degree scanning surface a0, and a distance L from the zero-degree scanning surface L on the projection-scribing board 10 marks a predetermined scanning surface of the other optical transceiver module of the multi-layered optical scanning apparatus 40. Finally, another optical transceiver module of the multi-layer optical scanning device 40 projects an actual scanning surface on the projection-scribing board 10, and the scanning spot of another optical transceiver module of the multi-layer optical scanning device 40 on the projection-scribing board 10 is adjusted through the infrared camera 50 and the display 60, so that the scanning spot corresponding to the actual scanning surface coincides with a predetermined scanning surface, and if the scanning spot of another optical transceiver module of the multi-layer optical scanning device 40 on the projection-scribing board 10 coincides with a corresponding mark on the projection-scribing board 10, it is stated that another optical transceiver module of the multi-layer optical scanning device 40 is adjusted to a proper position. According to the technical scheme, the projection scribing board 10 is used as a reference for scanning layer angle adjustment, scanning light spots to be adjusted are sequentially overlapped with corresponding marks corresponding to the projection scribing board 10, and then the whole adjustment work can be completed.

It should be noted that, in the technical solution of the present invention, whether the collimated light emitted from the collimator 30 and the received collimated light coincide is observed by observing the collimating eyepiece of the collimator 30. Since the light spots generated by the optical transceiver components of the multi-layered optical scanning apparatus 40 are typically in the infrared band invisible to the naked eye, the position of the light spots needs to be observed by means of the infrared camera 50 and the display 60.

More preferably, the setup assembly of the multi-layered optical scanning apparatus further comprises a self-leveling laser 70 mounted on the optical platform 20, the self-leveling laser 70 being used to establish the reference level. By using the self-leveling laser 70 to construct a reference level, it is possible to ensure that the optical bench 20 and the projected reticle 10 are located at the same level, thereby efficiently mounting the multilayer optical scanning apparatus.

As an alternative embodiment, as shown in FIG. 1, in the solution of the present embodiment, the second reflecting mirror 21 is located between the collimator 30 and the multi-layered optical scanning device 40. As an alternative embodiment, the second reflector 21 may be disposed on the left side of the collimator 30, so that the collimation of the rotation centers of the reticle 10 and the multilayer optical scanning device 40 can be achieved. More preferably, in order to improve the accuracy of the alignment, it is ensured that the reflecting surface of the first reflecting mirror 11 is as flush as possible with the surface of the projection reticle 10.

The invention also provides an assembly and adjustment method of the multilayer optical scanning device, which is used for the assembly and adjustment assembly of the multilayer optical scanning device and comprises the following steps: the collimating light is emitted through the collimator 30, the collimating light is reflected by the second reflector 21 to the first reflector 11 on the projection scribing board 10 by 90 degrees, the first reflector 11 reflects the collimating light back to the second reflector 21, the second reflector 21 reflects the collimating light back to the first reflector 11, the first reflector 11 reflects the collimating light back to the collimator 30, and the projection scribing board 10 is adjusted until the collimating light emitted by the collimator 30 coincides with the received collimating light. If the collimated light emitted by the collimator 30 and the collimated light received by the collimator 30 coincide, it means that the collimated light emitted by the collimator 30 is parallel to the projected line marking board 10. Since the center of rotation of the multilayer optical scanning device 40 is coaxial with the light rays emitted from the collimator 30, it can be deduced that the center of rotation of the multilayer optical scanning device 40 is parallel to the projected ruled line 10. Then, one optical transceiver module in the multi-layered optical scanning apparatus 40 whose angle of the scanning layer is to be adjusted projects a zero-degree scanning surface a0 on the projection-scribing board 10 and marks a zero-degree scanning surface a0, a distance p is defined between the multi-layered optical scanning apparatus 40 and the optical platform 20, an inclination angle of the other optical transceiver module of the multi-layered optical scanning apparatus 40 with respect to the one optical transceiver module of the multi-layered optical scanning apparatus 40 is β, a distance L = tan β × p is defined between a scanning surface of the other optical transceiver module of the multi-layered optical scanning apparatus 40 on the projection-scribing board 10 and the zero-degree scanning surface a0, and a distance L from the zero-degree scanning surface L on the projection-scribing board 10 marks a predetermined scanning surface of the other optical transceiver module of the multi-layered optical scanning apparatus 40. Finally, another optical transceiver component of the multi-layer optical scanning device 40 projects an actual scanning surface on the projection-scribing board 10, the scanning spot of another optical transceiver component of the multi-layer optical scanning device 40 on the projection-scribing board 10 is adjusted through the infrared camera 50 and the display 60, the scanning spot corresponding to the actual scanning surface is made to coincide with a predetermined scanning surface, and if the scanning spot of another optical transceiver component of the multi-layer optical scanning device 40 on the projection-scribing board 10 coincides with a corresponding mark on the projection-scribing board 10, it is described that another optical transceiver component of the multi-layer optical scanning device 40 is adjusted to a proper position.

Specifically, as shown in fig. 2 and 3, the coordinate system and the spatial angle of the direction vector of the multilayer optical scanning device 40 are defined. As shown in fig. 2, the right-hand three-dimensional coordinate system of the multilayer optical scanning device 40 is shown, the Z direction is the rotation center direction of the multilayer optical scanning device 40, the Y direction is the front of the multilayer optical scanning device 40, and the X direction is the lateral direction of the multilayer optical scanning device 40. X, Y is the zero degree scanning plane A0 of the multi-layer optical scanning device 40, the zero degree scanning plane A0 is formed by projecting one optical transceiver module of the multi-layer optical scanning device 40 on the projection scribing board 10, and the other optical transceiver modules of the multi-layer optical scanning device 40 sequentially project a first scanning layer plane A1, a second scanning layer plane A2 and a third scanning layer plane A2 on the projection scribing board 10. The fixture between the first scan level a1 and the zero degree scan plane a0 is at a first tilt angle β 1 and the fixture between the second scan level a2 and the zero degree scan plane a0 is at a second tilt angle β 2. As shown in fig. 3, the distance between the multi-layered optical scanning device 40 and the optical bench 20 is p, and the distance between the first scanning level a1 and the zero-degree scanning level a0 is L1, L1= tan β 1 × p; then the second scan slice a2 is at a distance L2 from the zero degree scan plane a0, L2= tan β 2 × p. Predetermined scan planes corresponding to the first scan level a1 and the second scan level a2 can be marked according to the calculated distances L1 and L2 from the zero degree scan planes L1 and L2 on the projected reticle 10, respectively, and then the optical transceiver modules corresponding to the first scan level a1 and the second scan level a2 are adjusted to make the scanning spots coincide with the predetermined scan planes corresponding to the first scan level a1 and the second scan level a 2. If the scanning spot coincides with the corresponding mark, it indicates that the optical transceiver components of the multilayer optical scanning device 40 are adjusted to the proper position.

Alternatively, the marking of the zero degree scan plane a0 or the corresponding marking of the first scan level a1 and the second scan level a2 may be performed by scribing or gluing.

More preferably, the installation and adjustment method further comprises: the optical bench 20 and the projected line marking board 10 are ensured to be located at the same horizontal plane by the self-leveling laser 70. By using the self-leveling laser 70 to construct a reference level, it is possible to ensure that the optical bench 20 and the projected reticle 10 are located at the same level, thereby efficiently mounting the multilayer optical scanning apparatus.

More preferably, in the solution of the present embodiment, the rotation center of the multilayer optical scanning device 40 is disposed horizontally to the light emitted from the collimator 30. In general, as the scanning layer to be adjusted becomes larger with the inclination angle, the required length of the projection reticle 10 is also increased, so that there is a certain requirement for adjusting the field space, and in order to meet the actual situation, the multilayer optical scanning device 40 is generally horizontally placed, and the process of adjusting the angle of the scanning layer is completed by adjusting the width and depth of the field.

As can be seen from the above, the technical solution of the present invention has the advantage that the multi-layer optical scanning device 40 with different pitch angle ranges of the optical transceiver module can be customized for the customer under the condition that the components of the product are already mass-produced. Therefore, products which are more suitable for requirements can be provided for customers, the utilization rate of product parts is improved, and the stock of raw materials for production is reduced. Meanwhile, the technical scheme fully considers the condition that common technical workers are not high in basic quality and utilizes the depth and the width of the assembly and debugging field on the basis of design thinking, and has no requirement on the net height of the assembly and debugging field.

One of ordinary skill in the art will appreciate that the examples described in connection with the embodiments disclosed herein may be implemented by other means of assistance as well. Exactly in what structural manner these functions are performed depends on the particular application and design constraints imposed on the technical solution. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present application.

The relative arrangement of the components and steps, the numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present invention unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

Spatially relative terms, such as "above … …," "above … …," "above … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial relationship to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" can include both an orientation of "above … …" and "below … …". The device may also be oriented 90 degrees or at other orientations and the spatially relative descriptors used herein interpreted accordingly.

In the description of the present invention, it is to be understood that the orientation or positional relationship indicated by the orientation words such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc. are usually based on the orientation or positional relationship shown in the drawings, and are only for convenience of description and simplicity of description, and in the case of not making a reverse description, these orientation words do not indicate and imply that the device or element being referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore, should not be considered as limiting the scope of the present invention; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A setup assembly for a multilayer optical scanning device, comprising:

the projection scribing board (10), wherein a first reflector (11) is arranged on the projection scribing board (10);

the optical platform (20) is arranged at a distance from the projection scribing board (10), and a second reflector (21) is installed on the optical platform (20);

the collimator (30) is arranged on the optical platform (20), and the collimator (30) is matched with the first reflector (11) through the second reflector (21) to verify that the projection scribing plate (10) and the collimator (30) emit light rays in parallel;

the multilayer optical scanning device (40) is arranged on the optical platform (20), the rotation center of the multilayer optical scanning device (40) is coaxial with the light emitted by the collimator (30), a plurality of optical transceiving components to be adjusted are arranged on the multilayer optical scanning device (40), the plurality of optical transceiving components are distributed layer by layer along the rotation center of the multilayer optical scanning device (40), and each optical transceiving component is used for forming a scanning layer;

an infrared camera (50) and a display (60) mounted on the optical platform (20) for monitoring whether a scanning spot of the multi-layer optical scanning device (40) coincides with a corresponding mark on the projected reticle (10).

2. The assembly of claim 1, further comprising a self-leveling laser (70) mounted on the optical platform (20), the self-leveling laser (70) being configured to establish a reference level.

3. The assembly of claim 1, wherein the second mirror (21) is positioned between the collimator (30) and the multi-layered optical scanning device (40).

4. An assembly according to claim 1, wherein the reflective surface of the first mirror (11) is flush with the surface of the reticle (10).

5. A method of assembly of a multi-layer optical scanning device, the method being for use in an assembly of a multi-layer optical scanning device as claimed in any one of claims 1 to 4, the method comprising:

the collimator (30) emits a calibration light, the calibration light is reflected by a second reflector (21) for 90 degrees to a first reflector (11) on a projection scribing board (10), the first reflector (11) reflects the calibration light to the second reflector (21), the second reflector (21) reflects the calibration light to the first reflector (11), the first reflector (11) reflects the calibration light to the collimator (30), and the projection scribing board (10) is adjusted until the calibration light emitted by the collimator (30) is coincident with the received calibration light;

an optical transceiver module in a multi-layered optical scanning apparatus (40) for adjusting the angle of a scanning layer projects a zero-degree scanning plane (A0) on the projection-scribing board (10) and marks the zero-degree scanning plane (A0), between the multilayer optical scanning device (40) and the optical bench (20) is a distance p, the other optical transceiver component of the multilayer optical scanning device (40) has a tilt angle beta with respect to the one optical transceiver component of the multilayer optical scanning device (40), the scan surface of another optical transceiver component of the multi-layer optical scanning device (40) on the projection reticle (10) is at a distance L from the zero degree scan surface (a 0), L = tan (β) xp, marking a predetermined scan plane of another optical transceiver component of the multi-layer optical scanning device (40) at a distance L from a zero degree scan plane (a 0) on the projected reticle (10);

and projecting an actual scanning surface on the projection scribing board (10) by using another optical transceiver component of the multilayer optical scanning device (40), and adjusting a scanning spot of the other optical transceiver component of the multilayer optical scanning device (40) on the projection scribing board (10) by using an infrared camera (50) and a display (60) to enable a scanning spot corresponding to the actual scanning surface to be superposed with the preset scanning surface.

6. A method of assembling a multilayer optical scanning device according to claim 5, further comprising: and ensuring that the optical platform (20) and the projection scribing board (10) are positioned at the same horizontal plane through a self-leveling laser (70).

7. A method of assembling a multilayer optical scanning device according to claim 5, comprising: the rotation center of the multilayer optical scanning device (40) is arranged horizontally to the emitted light of the collimator (30).