CN108732712B

CN108732712B - Optical path adjusting method and optical path adjusting device

Info

Publication number: CN108732712B
Application number: CN201810519466.0A
Authority: CN
Inventors: 马小伟; 鲍光华; 吕建涛; 王克生
Original assignee: Goertek Inc
Current assignee: Goertek Optical Technology Co Ltd
Priority date: 2018-05-25
Filing date: 2018-05-25
Publication date: 2020-09-15
Anticipated expiration: 2038-05-25
Also published as: CN108732712A

Abstract

The invention discloses a light path adjusting method and a light path adjusting device, wherein the light path adjusting method comprises the following steps: acquiring a first included angle between the first imaging light beam and the second imaging light beam; determining a first offset of the second lens on a plane perpendicular to the optical axis according to the first included angle; acquiring a first distance between the position of a first light spot and the position of a second light spot on an imaging plane; determining a second offset of the second lens on a plane perpendicular to the optical axis according to the first distance; determining a third offset according to the first offset and the second offset; adjusting the position of the second lens on a plane perpendicular to the optical axis according to the third offset to reduce the first included angle and the first distance; comparing the first included angle with a preset angle, and comparing the first distance with a preset distance; and when the first included angle is smaller than or equal to the preset angle and the first distance is smaller than or equal to the preset distance, ending the light path adjustment. The technical scheme of the invention improves the assembly yield and efficiency of the optical equipment.

Description

Optical path adjusting method and optical path adjusting device

Technical Field

The present invention relates to the field of optical technologies, and in particular, to an optical path adjusting method and an optical path adjusting apparatus.

Background

In the assembly of the optical device, there is a high precision requirement for the positions of the respective optical elements therein, and particularly with the development of technology, the volume of the optical device itself is further reduced, resulting in further improvement in the assembly precision. When assembling the multi-light path optical device, it is necessary to ensure not only the accuracy of each light path, but also the accuracy of the relative relationship between the light paths, so as to ensure the normal composition of different light beams. At present, the optical equipment is usually formed by manual assembly or semi-automatic assembly, has strong dependence on experience, lacks systematicness, is difficult to ensure accuracy and stability, and has low assembly yield and assembly efficiency.

Disclosure of Invention

The invention mainly aims to provide a light path adjusting method, which aims to solve the problems of poor precision and stability of multi-path light synthesis in the optical equipment and improve the assembly yield and assembly efficiency of the optical equipment.

In order to achieve the above object, the present invention provides an optical path adjusting method for adjusting an optical path in an optical device, the optical device including a first light source, a second light source, a first lens and a second lens, the first lens being located on an emergent light path of the first light source, and the second lens being located on an emergent light path of the second light source;

the optical path adjusting method includes the steps of:

acquiring a first included angle between a first imaging light beam and a second imaging light beam, wherein the first imaging light beam originates from the first light source, and the second imaging light beam originates from the second light source;

determining a first offset of the second lens on a plane perpendicular to the optical axis according to the first included angle;

acquiring a first distance between a position of a first light spot and a position of a second light spot on an imaging plane, wherein the first light spot is formed on the imaging plane by the first imaging light beam, and the second light spot is formed on the imaging plane by the second imaging light beam;

determining a second offset of the second lens on a plane perpendicular to the optical axis according to the first distance;

determining a third offset according to the first offset and the second offset;

adjusting the position of the second lens on a plane perpendicular to the optical axis according to the third offset to reduce the first included angle and the first distance;

comparing the first included angle with a preset angle, and comparing the first distance with a preset distance;

and when the first included angle is smaller than or equal to the preset angle and the first distance is smaller than or equal to the preset distance, ending the light path adjustment.

Preferably, after the step of comparing the first included angle with the preset angle and the step of comparing the first distance with the preset distance, the light path adjusting method further includes the steps of:

when the first included angle is larger than the preset angle or the first distance is larger than the preset distance, returning to execute the step of obtaining the first included angle between the first imaging light beam and the second imaging light beam; or the like, or, alternatively,

when the first included angle is larger than the preset angle or the first distance is larger than the preset distance, determining the first accumulated execution times of the steps of comparing the first included angle with the preset angle and comparing the first distance with the preset distance;

comparing the first accumulated execution times with a first preset time;

when the first accumulated execution times is less than the first preset times, returning to execute the step of acquiring the first included angle between the first imaging light beam and the second imaging light beam;

and when the first accumulated execution times is greater than or equal to a first preset time, stopping the current optical path adjustment and generating a prompt signal.

Preferably, the step of determining a first offset of the second lens on a plane perpendicular to the optical axis according to the first included angle includes:

determining a second cumulative number of executions i of said step of acquiring a first angle between a first imaging beam and a second imaging beam, noting that said first angle acquired i times is α_i；

Comparing the first included angle α_iAnd the preset angle α₀；

When the first included angle α_iGreater than the preset angle α₀And when the second accumulated execution time i is more than 1, according to k1_i＝α_i/D1_i-1-k1_i-1Calculating a first adjustment coefficient k1 of the second lens when the second accumulated execution number is i_i；

According to D1_i＝α_i/k1_iCalculating a first offset D1 of the second lens when the second accumulated execution time is i_i；

When the first included angle α_iGreater than the preset angle α₀And the second cumulative execution number i is equal to 1 according to D1₁＝α₁/k1₁Calculating a first offset D1 of the second lens when the second cumulative number is 1₁；

Wherein, k1₁The first adjustment coefficient of the second lens when the second cumulative number is 1.

Preferably, the step of determining a second shift amount of the second lens in a plane perpendicular to the optical axis based on the first distance includes:

determining a third cumulative number of executions j of the step of acquiring the first distance between the position of the first spot and the position of the second spot on the imaging plane, wherein the first distance acquired at the j time is β_j；

Comparing the first distance β_jAnd said predetermined distance β₀；

When the first distance β_jGreater than the preset distance β₀And when the third accumulated execution time j is more than 1, according to k2_j＝(β_j-β_j-1)/D2_j-1Calculating a second adjustment coefficient k2 of the second lens when the third accumulated execution time is j_j；

According to D2_j＝β_j/k2_jCalculating a second shift D2 of the second lens when the third accumulated execution time is j_j；

When the first distance β_jGreater than the preset distance β₀And the third cumulative number of executions j is equal to 1 according to D2₁＝β₁/k2₁Calculating a second shift amount D2 of the second lens when the third cumulative execution number is 1₁；

Wherein, k2₁A second adjustment coefficient of the second lens when the third cumulative execution number is 1.

Preferably, the step of determining a third offset according to the first offset and the second offset comprises:

acquiring a first position adjusting range of the second lens on a plane perpendicular to an optical axis according to the first offset;

acquiring a second position adjusting range of the second lens on a plane perpendicular to the optical axis according to the second offset;

determining the center of an overlapping area of the first adjustment range and the second adjustment range, and taking the offset corresponding to the center of the overlapping area as the third offset.

Preferably, the optical device further comprises a variable mirror, the variable mirror is positioned on an exit light path of the first lens, and the variable mirror is positioned on an exit light path of the second lens;

before the step of obtaining the first included angle between the first imaging beam and the second imaging beam is performed for the first time, the optical path adjusting method further includes the steps of:

adjusting the positions of the first lens and the second lens on a plane perpendicular to the optical axis so that a third light spot formed by the first imaging light beam on the variable reflector is located within a first preset range of the variable reflector and a fourth light spot formed by the second imaging light beam on the variable reflector is located within a second preset range of the variable reflector;

adjusting positions of the first lens and the second lens in the optical axis direction so that the first imaging light beam is focused on the imaging plane and the second imaging light beam is focused on the imaging plane.

Preferably, the step of adjusting the position of the first lens on the plane perpendicular to the optical axis so that the third light spot formed by the first imaging light beam on the variable mirror is located within the first preset range of the variable mirror comprises:

placing the first lens outside the optical path of the optical device, controlling the first light source to illuminate the variable reflector, and acquiring a first image formed by the variable reflector on the imaging plane;

acquiring a first target range corresponding to the first preset range on the imaging plane according to the first image;

placing the first lens into the optical path of the optical equipment to obtain the position of the first light spot;

determining a fourth offset of the first lens according to the first target range and the position of the first light spot;

and adjusting the position of the first lens on a plane perpendicular to the optical axis according to the fourth offset amount so that the first light spot is positioned in the first target range.

Preferably, the step of adjusting the position of the first lens in the optical axis direction to focus the first imaging light beam on the imaging plane includes:

acquiring the relation between the spot size of the lens and the imaging distance;

determining a first axial position of the first lens in the optical axis direction according to the relation between the spot size and the imaging distance, and adjusting the first lens to the first axial position;

acquiring a first size of the first light spot when the first lens is located at the first axial position;

determining a second axial position and a third axial position of the first lens in the optical axis direction according to the first size and the relation between the spot size and the imaging distance;

adjusting the first lens to the second axial position, and acquiring a second size of the first light spot when the first lens is located at the second axial position;

adjusting the first lens to the third axial position, and acquiring a third size of the first light spot when the first lens is located at the third axial position;

determining a first minimum spot size of the first size, the second size and the third size, taking a position of the first lens in the optical axis direction when the spot size of the first spot is the first minimum spot size as an updated first axial position, and adjusting the first lens to the first axial position;

and returning to the step of obtaining the first size of the first light spot when the first lens is located at the first axial position until a fourth accumulated execution time of the step of obtaining the first size of the first light spot is greater than or equal to a second preset time when the minimum light spot size obtained at the second time is greater than or equal to the minimum light spot size obtained at the previous time, or a second distance between the first axial position and the second axial position is less than a minimum adjustable distance, or a third distance between the first axial position and the third axial position is less than a minimum adjustable distance, or the step of obtaining the first size of the first light spot when the first lens is located at the first axial position.

Preferably, after the step of adjusting the first lens to the first axial position is performed for the last time, the method further includes the steps of:

determining a fourth axial position of the first lens in the optical axis direction according to a preset step length and a preset direction, and adjusting the first lens to the fourth axial position;

acquiring a fourth size of the first light spot when the first lens is located at the fourth axial position;

taking the moving direction of the first lens in the optical axis direction when the spot size of the first light spot is changed from large to small before and after the first lens is adjusted to the fourth axial position as an updated preset direction;

returning to the step of executing the step of determining the fourth axial position of the first lens in the optical axis direction according to the preset step length and the preset direction, and adjusting the first lens to the fourth axial position until the number of the accumulated fourth sizes is larger than or equal to the preset number;

determining the relationship between the updated spot size of the lens and the imaging distance according to each fourth axial position of the first lens and the corresponding fourth size;

determining a fifth axial position of the first lens in the optical axis direction according to the updated relation between the spot size of the lens and the imaging distance, and adjusting the first lens to the fifth axial position;

acquiring a fifth size of a first light spot when the first lens is positioned at the fifth axial position;

determining a second minimum spot size of the first size, the second size, the third size, the fourth size, and the fifth size, taking a position of the first lens in the optical axis direction when the spot size of the first spot is the second minimum spot size as a focusing position of the first lens, and adjusting the first lens to the focusing position.

Preferably, after the step of adjusting the positions of the first lens and the second lens in the optical axis direction to focus the first imaging light beam on the imaging plane and the second imaging light beam on the imaging plane, the optical path adjusting method further includes the steps of:

adjusting the positions of the first lens and the second lens on a plane perpendicular to the optical axis so that a third light spot formed by the first imaging light beam on the variable reflector is located within a third preset range of the variable reflector, and a fourth light spot formed by the second imaging light beam on the variable reflector is located within a fourth preset range of the variable reflector;

the third preset range is smaller than or equal to the first preset range, and the fourth preset range is smaller than or equal to the second preset range.

Preferably, when the first included angle is smaller than or equal to the preset angle and the first distance is smaller than or equal to the preset distance, the step of ending the light path adjustment includes:

when the first included angle is smaller than or equal to the preset angle and the first distance is smaller than or equal to the preset distance, acquiring a sixth size of the first light spot and a seventh size of the second light spot;

comparing the sixth size with a first preset size, and comparing the seventh size with a second preset size;

when the sixth size is smaller than or equal to the first preset size and the seventh size is smaller than or equal to the second preset size, ending the optical path adjustment;

when the sixth size is larger than the first preset size or the seventh size is larger than the second preset size, adjusting the positions of the first lens and the second lens in the optical axis direction to enable the first imaging light beam to be focused on the imaging plane and the second imaging light beam to be focused on the imaging plane.

The invention also provides an optical path adjusting device, which is used for adjusting an optical path in optical equipment, wherein the optical equipment comprises a first light source, a second light source, a first lens and a second lens, the first lens is positioned on an emergent light path of the first light source, and the second lens is positioned on an emergent light path of the second light source;

the optical path adjusting device comprises a first imaging component, a driving component, a memory, a processor and an optical path adjusting program which is stored on the memory and can be operated on the processor, wherein: the first imaging component is positioned on an emergent light path of the first lens, is positioned on an emergent light path of the second lens and is used for receiving the first light spot and the second light spot; the driving assembly is connected with the first lens and the second lens and is used for adjusting the position of the first lens and the position of the second lens; the optical path adjustment program, when executed by the processor, implements the steps of the optical path adjustment method, the optical path adjustment method including the steps of: acquiring a first included angle between a first imaging light beam and a second imaging light beam, wherein the first imaging light beam originates from the first light source, and the second imaging light beam originates from the second light source; determining a first offset of the second lens on a plane perpendicular to the optical axis according to the first included angle; acquiring a first distance between a position of a first light spot and a position of a second light spot on an imaging plane, wherein the first light spot is formed on the imaging plane by the first imaging light beam, and the second light spot is formed on the imaging plane by the second imaging light beam; determining a second offset of the second lens on a plane perpendicular to the optical axis according to the first distance; determining a third offset according to the first offset and the second offset; adjusting the position of the second lens on a plane perpendicular to the optical axis according to the third offset to reduce the first included angle and the first distance; comparing the first included angle with a preset angle, and comparing the first distance with a preset distance; and when the first included angle is smaller than or equal to the preset angle and the first distance is smaller than or equal to the preset distance, ending the light path adjustment.

the light path adjusting device also comprises a beam splitter and a second imaging component, wherein the beam splitter is positioned on an emergent light path of the variable reflector, and the first imaging component is positioned on a first emergent light path of the beam splitter; and the second imaging component is positioned on a second emergent light path of the beam splitter and is used for receiving the first light spot and the second light spot.

Preferably, the first imaging assembly comprises a holographic diffusion screen and a focus calibration camera; the second imaging component includes a conjugate lens and a position calibration camera.

In the technical scheme of the invention, the light path adjusting method comprises the following steps: acquiring a first included angle between a first imaging light beam and a second imaging light beam, wherein the first imaging light beam is from a first light source, and the second imaging light beam is from a second light source; determining a first offset of the second lens on a plane perpendicular to the optical axis according to the first included angle; acquiring a first distance between the position of a first light spot and the position of a second light spot on an imaging plane, wherein the first light spot is formed on the imaging plane by a first imaging light beam, and the second light spot is formed on the imaging plane by a second imaging light beam; determining a second offset of the second lens on a plane perpendicular to the optical axis according to the first distance; determining a third offset according to the first offset and the second offset; adjusting the position of the second lens on a plane perpendicular to the optical axis according to the third offset to reduce the first included angle and the first distance; comparing the first included angle with a preset angle, and comparing the first distance with a preset distance; and when the first included angle is smaller than or equal to the preset angle and the first distance is smaller than or equal to the preset distance, ending the light path adjustment. When the optical equipment is adjusted, one optical path is taken as a reference optical path (an optical path where a first imaging light beam is located), a first offset and a second offset of a second lens in a light path to be adjusted are respectively determined according to an included angle between an imaging light beam of the light path to be adjusted (an optical path where a second imaging light beam is located) and the imaging light beam of the reference optical path and a distance between a light spot in the light path to be adjusted and a position of the light spot in the reference optical path on an imaging plane, a third offset for controlling the second lens to move is obtained according to the first offset and the second offset, and the position of the second lens is adjusted according to the third offset until the first included angle is smaller than or equal to a preset angle and the first distance is smaller than or equal to the preset distance, so that the imaging light beam of the light path to be adjusted and the imaging light beam of the reference optical path can be normally. The optical path adjusting method provided by the invention enables the adjustment of the optical path in the optical equipment to be more systematic, the systematicness enables the automatic adjustment of the optical path to be possible, the driving component and the like are convenient to drive the second lens to automatically change the position according to the third offset, meanwhile, the optical path adjusting method also improves the accuracy and the stability of the synthesis of the multi-path imaging light beams, and the assembly yield and the assembly efficiency of the optical equipment are improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic structural diagram of an optical apparatus and an optical path adjusting apparatus according to an embodiment of the optical path adjusting apparatus of the present invention;

FIG. 2 is a schematic flow chart of a first embodiment of the optical path adjusting method according to the present invention;

FIG. 3 is a schematic diagram illustrating calculation of a first included angle in the optical path adjusting method of FIG. 2;

FIG. 4 is a schematic flow chart of a seventh embodiment of the optical path adjusting method according to the present invention;

fig. 5 is a schematic diagram illustrating a relationship between a spot size and an imaging distance of a lens according to a ninth embodiment of the optical path adjusting method of the present invention.

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

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, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.

In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.

The invention provides a light path adjusting method.

In the first embodiment of the present invention, as shown in fig. 1, the optical apparatus 100 includes a first light source 111, a second light source 112, a first lens 121, and a second lens 122, the first lens 121 being located on an exit light path of the first light source 111, and the second lens 122 being located on an exit light path of the second light source 112.

Specifically, the optical apparatus 100 in the present embodiment may be a micro projector, and in order to implement color projection, the micro projector is generally provided with a first light source 111, a second light source 112 and a third light source 113 corresponding to three colors of green, red and blue, respectively, and each light source has a first light path, a second light path and a third light path, respectively, and the light paths have substantially similar structures. In order to reduce the space occupied by the optical device such as the micro projector, the first mirror 141, the second mirror 142, the third mirror 143, and the like may be respectively disposed in the first optical path, the second optical path, and the third optical path, so as to change the propagation direction of light and improve the space utilization rate in the optical device. When adjusting the micro projector, the positions of the lenses in the first, second and third optical paths, including the first lens 121, the second lens 122 and the third lens 123, are mainly adjusted, so that the three colors of green, red and blue light can be combined into a color projection image on the imaging plane. It should be noted that the lens here may be a single lens, or may be a lens group capable of meeting certain imaging requirements, and when adjusting the optical path, the adjustment mode of the lens group may refer to the adjustment mode of the single lens, so as to realize the combination of the imaging light beams in different optical paths. Hereinafter, the technical solution of the present invention will be described in detail by taking how to adjust the second optical path (the light-to-be-adjusted path) by taking the first optical path as the reference optical path to realize the synthesis of the imaging light beam in the first optical path and the imaging light beam in the second optical path. It should be noted that in other optical apparatuses, there may be multiple optical paths set in other manners, and those skilled in the art may adjust the optical paths in various forms according to the manner of adjusting the second optical path in this embodiment, that is, adjust the adjusted optical path according to the reference optical path, until all the optical paths are adjusted. Since the green light is basically in the central wavelength band of the visible light, in the micro projector, the light path corresponding to the green light is usually used as the reference light path, and the light paths of the red light and the blue light are respectively adjusted, but of course, other light paths can be arbitrarily selected as the reference light path for adjustment. In the present embodiment, the first imaging light beam from the first light source 111 and the second imaging light beam from the second light source 112 can be normally combined mainly by adjusting the position of the second lens 122.

As shown in fig. 2, the optical path adjusting method includes the steps of:

s100, acquiring a first included angle between a first imaging light beam and a second imaging light beam;

in the following description, calculation is performed based on the first imaging light beam and the second imaging light beam closest to the imaging plane for simplicity, and in general, the first angle between the first imaging light beam and the second imaging light beam is a small acute angle, as shown in fig. 3, in a specific example, the plane where the first imaging light beam and the second imaging light beam are located is a YZ plane, and the first angle α can be calculated based on α — arctan (m) taking into account that the light beam emitted by the light source may be deflected by a mirror or the like in the optical path₂/n)-arctan(m₁N) is obtained, wherein m₁The distance between the first spot formed on the imaging plane by the first imaging beam and the center of the imaging plane (m when the first spot is assumed to be located above the center of the imaging plane₁Is positive; m when the first light spot is positioned below the center of the imaging plane₁Is negative), m₂The distance between the second spot formed on the imaging plane by the second imaging beam and the center of the imaging plane (m when the second spot is assumed to be located above the center of the imaging plane₂Is positive; second lightM when the spot is located below the center of the imaging plane₂Negative), the center of the imaging plane is the intersection point between the imaging plane and the optical axis; and n is an imaging distance which is the distance between the center of the imaging plane and the intersection point of the straight line of the first imaging light beam closest to the imaging plane and the straight line of the second imaging light beam closest to the imaging plane.

Step S200, determining a first offset of the second lens 122 on a plane perpendicular to the optical axis according to the first included angle;

when the first included angle is too large, the first imaging beam and the second imaging beam are difficult to combine, and the first included angle between the first imaging beam and the second imaging beam needs to be reduced by adjusting the position of the second lens 122 on the plane perpendicular to the optical axis. The first offset of the second lens 122 is determined according to the first included angle, and the larger the first included angle is, the larger the corresponding first offset is, so as to correct the position of the second lens. In determining the first offset amount, the first offset amount may also be calculated according to a known correspondence between the direction of the imaging light beam and the position of the second lens, which will be described in detail later.

Step S300, acquiring a first distance between the position of a first light spot and the position of a second light spot on an imaging plane;

wherein the first spot is formed on the imaging plane by the first imaging beam and the second spot is formed on the imaging plane by the second imaging beam. When the plane in which the first imaging light beam and the second imaging light beam are collectively located is taken as the YZ plane in calculating the first distance, the distance between the first light spot and the second light spot can be obtained from the positions of the first light spot and the second light spot in the Y direction, as shown in fig. 3. It should be noted that, if the first imaging light beam and the second imaging light beam are not both on the YZ plane, the distances between the first light spot and the second light spot in each direction need to be considered comprehensively, and then the distance between the first light spot and the second light spot is obtained according to the orthogonal relationship of the coordinates.

Step S400, determining a second offset of the second lens on a plane perpendicular to the optical axis according to the first distance;

when the first distance is too large, the first imaging beam and the second imaging beam are also difficult to combine, and the first distance between the position of the first spot and the position of the second spot needs to be reduced by adjusting the position of the second lens 122 on the plane perpendicular to the optical axis. The second offset of the second lens 122 is determined according to the first distance, and the larger the first distance is, the larger the corresponding second offset is, so as to correct the position of the second lens. When determining the second offset of the second lens 122, the component of the second offset in the X direction and the component in the Y direction can be obtained by decomposing according to the orthogonal coordinate system shown in fig. 3, and since the X direction and the Y direction are perpendicular to each other, there is substantially no interference between the X direction and the Y direction when adjusting the second lens, which is beneficial to simplifying the adjustment process. In determining the second offset, the second offset may also be calculated according to a known correspondence between the position of the light spot on the imaging plane and the position of the second lens, which will be described in detail later.

Step S500, determining a third offset according to the first offset and the second offset;

in order to avoid the first included angle being too large when adjusted, or the first included angle being too large when adjusted, the third offset needs to be determined according to the first offset and the second offset, and the adjustment range of the second lens 122 is limited, so as to reduce the mutual interference between the adjustment of the first included angle and the first distance. In general, the third offset amount is determined according to an overlapping region of the first position adjustment range determined by the first offset amount and the second position adjustment range determined by the second offset amount, and when the second lens 122 is restricted from changing its position in the overlapping region, optimization of the first angle and the first distance can be simultaneously achieved, which will be described in detail later.

Step S600, adjusting the position of the second lens 122 on the plane perpendicular to the optical axis according to the third offset to reduce the first included angle and the first distance;

after the third offset amount is determined, the position of the second lens 122 on the plane perpendicular to the optical axis is actually adjusted by the third offset amount to reduce the first angle and the first distance. In order to simplify the adjustment and avoid the mutual interference between the adjustment in the X direction and the adjustment in the Y direction, a component of the third offset amount in the X direction and a component in the Y direction may be determined, respectively, and the position of the second lens may be adjusted. The adjustment of the position of the second lens 122 can also be automatically performed by the driving assembly, so as to improve the accuracy and stability of the position adjustment.

Step S710, comparing the first included angle with a preset angle, and comparing the first distance with a preset distance;

by comparing the first included angle with the preset angle, the first distance with the preset distance, it is determined whether the first imaging beam and the second imaging beam can be normally combined, so as to further determine whether the position of the second lens 122 needs to be continuously adjusted.

Step S721, when the first included angle is smaller than or equal to the preset angle and the first distance is smaller than or equal to the preset distance, ending the optical path adjustment.

When the first included angle is smaller than or equal to the preset angle and the first distance is smaller than or equal to the preset distance, it indicates that the deviation between the first imaging light beam and the second imaging light beam is small and the first imaging light beam and the second imaging light beam can be normally synthesized, and then the light path adjustment is finished.

In this embodiment, the optical path adjusting method includes the steps of: acquiring a first included angle between a first imaging light beam and a second imaging light beam, wherein the first imaging light beam originates from a first light source 111, and the second imaging light beam originates from a second light source 112; determining a first offset of the second lens 122 on a plane perpendicular to the optical axis according to the first included angle; acquiring a first distance between the position of a first light spot and the position of a second light spot on an imaging plane, wherein the first light spot is formed on the imaging plane by a first imaging light beam, and the second light spot is formed on the imaging plane by a second imaging light beam; determining a second offset amount of the second lens 122 on a plane perpendicular to the optical axis according to the first distance; determining a third offset according to the first offset and the second offset; adjusting the position of the second lens 122 on the plane perpendicular to the optical axis by the third offset amount to reduce the first included angle and the first distance; comparing the first included angle with a preset angle, and comparing the first distance with a preset distance; and when the first included angle is smaller than or equal to the preset angle and the first distance is smaller than or equal to the preset distance, ending the light path adjustment. When the optical device is adjusted, one of the optical paths is used as a reference optical path (an optical path where the first imaging light beam is located), a first offset and a second offset of the second lens 122 in the adjusted optical path are respectively determined according to an included angle between the imaging light beam of the adjusted optical path (an optical path where the second imaging light beam is located) and the imaging light beam of the reference optical path and a distance between a light spot in the adjusted optical path and a position of the light spot in the reference optical path on an imaging plane, a third offset for controlling the second lens 122 to move is obtained according to the first offset and the second offset, and the position of the second lens 122 is adjusted according to the third offset until the first included angle is smaller than or equal to a preset angle and the first distance is smaller than or equal to a preset distance, so that the imaging light beam of the adjusted optical path can be normally combined with the imaging light beam of the reference optical path. The light path adjusting method provided by the invention enables the adjustment of the light path in the optical equipment to be more systematic, the systematicness enables the automatic adjustment of the light path to be possible, the driving component and the like are adopted to drive the second lens 122 to automatically change the position according to the third offset, meanwhile, the light path adjusting method also improves the accuracy and the stability of the synthesis of the multi-path imaging light beams, and the assembly yield and the assembly efficiency of the optical equipment are improved.

Based on the above-described first embodiment, in the second embodiment of the present invention, after step S710, the optical path adjusting method further includes the steps of:

step S722, when the first included angle is greater than the preset angle, or the first distance is greater than the preset distance, the process returns to step S100.

In this embodiment, after changing the position of the second lens 122 each time, if the first included angle is greater than the preset angle, or the first distance is greater than the preset distance, it indicates that the deviation between the first imaging beam and the second imaging beam is still large at this time, and the composition of the first imaging beam and the second imaging beam is affected, so that the step S100 is executed by returning to the step S, and the position of the second lens 122 is continuously adjusted until the first included angle is less than or equal to the preset angle and the first distance is less than or equal to the preset distance, and the adjustment is ended.

Based on the first embodiment described above, in the third embodiment of the present invention, after step S710, the optical path adjusting method further includes the steps of:

step S723, when the first included angle is larger than a preset angle or the first distance is larger than a preset distance, determining the first accumulated execution times of the step S710;

step S724, comparing the first accumulated execution times with a first preset time;

step S725, when the first accumulated execution times is less than a first preset time, returning to execute the step S100;

step S726, when the first accumulated execution time is greater than or equal to the first preset time, stopping the current optical path adjustment, and generating a prompt signal.

In this embodiment, in order to avoid the low assembly efficiency of the optical device caused by the continuous ineffective adjustment, the number of times of execution of step S710 is accumulated, considering that the optical device itself may have a problem, which may result in that the adjustment may not be performed until the first imaging beam and the second imaging beam are normally combined. That is, when the first accumulated execution time of step S710 is greater than or equal to the first preset time, which indicates that the position of the second lens 122 has been changed for multiple times and still does not meet the requirement for adjusting the optical path in the optical device, the optical path adjustment is terminated this time and a prompt signal is generated to prompt a relevant person to check the optical device, so as to improve the adjustment efficiency; when the first accumulated execution time is less than the first preset time, which indicates that the adjustment time of the position of the second lens 122 has not reached the upper limit time, the method returns to step S100 to continue adjusting the optical path of the optical device.

Based on the above embodiments, in the fourth embodiment of the present invention, step S200 includes:

step S210, determining the second accumulated execution time i of the step S100, and recording the first included angle obtained at the ith time as α_i；

Step S220, comparing the first included angle α_iAnd a preset angle α₀；

Step S231,When the first included angle α_iGreater than a predetermined angle α₀And when the second accumulated execution time i is greater than 1, according to k1_i＝α_i/D1_i-1-k1_i-1Calculating a first adjustment coefficient k1 of the second lens when the second cumulative execution number is i_i；

Step S232, according to D1_i＝α_i/k1_iCalculating a first offset D1 of the second lens when the second cumulative execution number is i_i；

Step S240, when the first included angle α_iGreater than a predetermined angle α₀And the second cumulative number of executions i is equal to 1 according to D1₁＝α₁/k1₁Calculating the first offset D1 of the second lens when the second cumulative number is 1₁；

Wherein, k1₁The first adjustment coefficient of the second lens when the second cumulative number is 1. In the present embodiment, the first offset is obtained by a stepwise determination method, and the first adjustment coefficient represents the relationship between the offset of the second lens 122 and the change of the first included angle. In the process of determining the first offset each time, the first adjustment coefficient of this time is updated according to the first offset obtained last time and the first adjustment coefficient adopted last time, so that excessive adjustment is avoided, and the adjustment efficiency is improved. Specifically, the first offset D1 is determined for the first time₁According to a preset first adjusting coefficient k1₁And first derived first included angle α₁To obtain a first offset D1₁＝α₁/k1₁After continuing to step S300 to step S600, that is, actually changing the position of the second lens 122 according to the first derived third offset, if the first included angle α is present₂Still greater than the preset angle α₀A second adjustment is required. Determining the first offset D1 at a second time₂According to k1₂＝α₂/D1₁-k1₁A second regulating factor k1 is obtained₂According to D1₂＝α₂/k1₂Determining a second offset D1₂Continuing to execute step S300 to step S600 according to the third offset obtained for the second timeThe position of the second lens 122 is changed, and the adjustment is performed by analogy until the first included angle is smaller than or equal to the preset angle and the first distance is smaller than or equal to the preset distance. In determining the first offset amount, the space may be decomposed according to an orthogonal coordinate system to obtain the first offset amount in each direction, so as to simplify the adjustment of the second lens 122.

Based on the above embodiments, in the fifth embodiment of the present invention, step S400 includes:

step S410, determining the third accumulative execution time j of the step S300, and recording the obtained first distance of the jth time as β_j；

Step S420, comparing the first distance β_jAnd a predetermined distance β₀；

Step S431, when the first distance β_jGreater than a predetermined distance β₀And the third cumulative execution number j is greater than 1 according to k2_j＝(β_j-β_j-1)/D2_j-1Calculating a second adjustment coefficient k2 of the second lens when the third accumulated execution time is j_j；

Step S432, according to D2_j＝β_j/k2_jCalculating a second shift D2 of the second lens when the third cumulative execution time is j_j；

Step S440, when the first distance β_jGreater than a predetermined distance β₀And the third cumulative number of executions j is equal to 1 according to D2₁＝β₁/k2₁Calculating a second shift amount D2 of the second lens when the third cumulative execution number is 1₁；

Wherein, k2₁The second adjustment coefficient of the second lens when the third cumulative execution number is 1. In the present embodiment, a stepwise determination method is used to derive the second offset, and the second adjustment coefficient characterizes the relationship between the offset of the second lens 122 and the position change of the optical spot on the imaging plane. In the process of determining the second offset each time, the second adjustment coefficient of this time is updated according to the second offset obtained last time and the second adjustment coefficient adopted last time, so that excessive adjustment is avoided, and the adjustment efficiency is improved. In particular, the second bias is determined for the first timeDisplacement D2₁According to a preset second adjusting coefficient k2₁And a first distance β derived for the first time₁To obtain a second offset D2₁＝β₁/k2₁After continuing to step S500 to step S600, that is, actually changing the position of the second lens 122 according to the first derived third offset amount, if the first distance β is present₂Still greater than the preset distance β₀A second adjustment is required. At a second time, a second offset D2 is determined₂According to k2₂＝(β₂-β₁)/D2₂A second regulating factor k2 is obtained₂According to D2₂＝β₂/k2₂Determining a second offset D2₂And continuing to execute the steps S500 to S600, changing the position of the second lens 122 according to the second obtained third offset, and so on until the first included angle is smaller than or equal to the preset angle and the first distance is smaller than or equal to the preset distance. In determining the second offset amount, the space may be decomposed according to the orthogonal coordinate system to obtain the second offset amount in each direction, so as to simplify the adjustment of the second lens 122.

Based on the above embodiments, in the sixth embodiment of the present invention, step S500 includes:

step S510, acquiring a first position adjusting range of the second lens on a plane perpendicular to the optical axis according to the first offset;

step S520, acquiring a second position adjusting range of the second lens on a plane perpendicular to the optical axis according to the second offset;

step S530, determining a center of an overlapping area of the first adjustment range and the second adjustment range, and taking a shift amount corresponding to the center of the overlapping area as a third shift amount.

In order to avoid interference between the adjustment of the first included angle and the first distance, when the first included angle is decreased, the first distance is increased, or when the first distance is decreased, the first included angle is increased, in the present embodiment, the first offset amount and the second offset amount are considered together to determine the actual change amount of the position of the second lens 122, that is, the third offset amount. Specifically, a first position adjustment range of the second lens 122 on a plane perpendicular to the optical axis is obtained, the first offset is a maximum adjustment amount of the second lens obtained according to the first included angle, and the first position adjustment range is within a maximum adjustment amount corresponding to the first offset. Similarly, a second position adjustment range of the second lens 122 on the plane perpendicular to the optical axis is obtained according to a second offset, where the second offset is a maximum adjustment amount of the second lens obtained according to the first distance, and the second position adjustment range is within a maximum adjustment amount corresponding to the second offset. Then, according to the overlapping area of the first position adjustment range and the second position adjustment range, the adjustment range of the second lens 122, which can reduce both the first included angle and the first distance, can be obtained. Furthermore, in order to improve the adjustment efficiency, the center of the overlapped area is taken as a third offset, so that the rapid adjustment is realized on the basis that the first included angle and the first distance can be reduced.

Based on the above embodiments, in the seventh embodiment of the present invention, as shown in fig. 1, the optical apparatus further includes a variable mirror 130, the variable mirror 130 is located on the light exit path of the first lens 121, and the variable mirror is located on the light exit path of the second lens 122;

as shown in fig. 4, before the step S100 is performed for the first time, the optical path adjusting method further includes the steps of:

step 810, adjusting the positions of the first lens and the second lens on a plane perpendicular to the optical axis, so that a third light spot formed by the first imaging light beam on the variable reflector is located in a first preset range of the variable reflector, and a fourth light spot formed by the second imaging light beam on the variable reflector is located in a second preset range of the variable reflector;

step S820, adjusting the positions of the first lens and the second lens in the optical axis direction, so that the first imaging beam is focused on the imaging plane and the second imaging beam is focused on the imaging plane.

Since the position of the optical element may slightly shift after long-term use, the imaging beam should be irradiated on the center position of the optical element as much as possible when the optical path is adjusted, so that the final imaging is less affected even if the position of the optical element shifts. Therefore, before adjusting the combination of the imaging beams in different optical paths, the optical paths need to be adjusted respectively, so that the imaging beams in the optical paths are basically irradiated on the central position of the optical element and are normally focused, and a better imaging effect is obtained. Specifically, by adjusting the positions of the first lens 121 and the second lens 122 on the plane perpendicular to the optical axis, the third light spot formed by the first imaging light beam on the variable reflecting mirror 130 is located within a first preset range of the variable reflecting mirror 130, the first preset range is generally a range near the center of the variable reflecting mirror 130, and the fourth light spot formed by the second imaging light beam on the variable reflecting mirror 130 is located within a second preset range of the variable reflecting mirror 130, the second preset range is also generally a range near the center of the variable reflecting mirror 130, and may also be consistent with the first preset range. By adjusting the positions of the first lens 121 and the second lens 122 in the optical axis direction, the first imaging light beam and the second imaging light beam can be focused on the imaging plane to achieve a clear display effect.

Hereinafter, the adjustment of the first optical path where the first light source 111 is located will be taken as an example to describe in detail the adjustment of the position and the adjustment of the focus of the imaging light beam in the optical path, and those skilled in the art will understand that the adjustment of other optical paths can be performed with reference to the adjustment of the first optical path. Based on the seventh embodiment of the present invention, in the eighth embodiment of the present invention, step S810 includes:

step S811, placing the first lens 121 outside the optical path of the optical device, controlling the first light source 111 to illuminate the variable mirror 130, and acquiring a first image formed by the variable mirror 130 on the imaging plane;

step S812, acquiring a first target range corresponding to a first preset range on an imaging plane according to the first image;

step S813, placing the first lens 121 in the optical path of the optical device to obtain the position of the first light spot;

step S814, determining a fourth offset of the first lens according to the first target range and the position of the first light spot;

step S815, adjusting the position of the first lens on the plane perpendicular to the optical axis according to the fourth shift amount, so that the first light spot is located within the first target range.

In the embodiment, when the first lens 121 is out of the optical path, the first light source 111 illuminates the variable mirror 130 to obtain a first image, and the first image corresponds to the image of the variable mirror 130, and according to the first image, a corresponding first target range of the first preset range on the variable mirror 130 on the imaging plane can be determined. After the first lens 121 is placed in the optical path, the imaging light beam is condensed to form a first light spot, and when the first light spot is in the first target range, it can be determined that the light beam generated by the first light source 111 substantially irradiates within the first preset range of the variable mirror 130, so as to meet the adjustment requirement.

Based on the seventh and eighth embodiments described above, in the ninth embodiment of the present invention, step S820 includes:

step S821, acquiring the relation between the spot size of the lens and the imaging distance;

step S822, determining a first axial position of the first lens 121 in the optical axis direction according to a relationship between the spot size and the imaging distance, and adjusting the first lens 121 to the first axial position;

step S823a, acquiring a first size of the first light spot when the first lens 121 is located at the first axial position;

step S823b of determining a second axial position and a third axial position of the first lens 121 in the optical axis direction, based on the first size and the relationship between the spot size and the imaging distance;

step S823c, adjusting the first lens 121 to the second axial position, and acquiring a second size of the first light spot when the first lens 121 is located at the second axial position;

step S823d, adjusting the first lens 121 to the third axial position, and acquiring a third size of the first light spot when the first lens is located at the third axial position;

step S823e of determining a first minimum spot size of the first size, the second size, and the third size, taking a position of the first lens 121 in the optical axis direction when the spot size of the first spot is the first minimum spot size as an updated first axial position, and adjusting the first lens to the first axial position;

step S823f, return to step S823a, until the minimum spot size obtained this time is greater than or equal to the minimum spot size obtained last time, or the second distance between the first axial position and the second axial position is smaller than the minimum adjustable distance, or the third distance between the first axial position and the third axial position is smaller than the minimum adjustable distance, or the fourth cumulative number of times of execution of step S823a is greater than or equal to the second preset number of times.

In the present embodiment, the focus position of the first lens is determined according to the relationship between the spot size of the lens and the imaging distance. Specifically, the relationship between the spot size and the imaging distance of the lens may be obtained by measuring the relationship between the spot size and the imaging distance in a plurality of (usually 50 to 100) lenses of the same type as the first lens 121, and further performing statistics, averaging, fitting, and the like. As shown in fig. 5, which is a schematic diagram of the relationship between the spot size of the lens and the imaging distance, the interval between the measurement points is 1 μm, the measurement range is about 300 μm, and the relationship between the spot size R and the imaging distance Z obtained by fitting is: in the case of under-focus, R-135538Z +514588, and in the case of over-focus, R-83849Z-315434. It should be noted that the fitting relationship may vary according to the type of the first lens 121 selected. Based on the relationship between the spot size and the imaging distance, the focusing position of the first lens, i.e., the first axial position of the first lens 121 corresponding to the imaging distance when the spot size is close to the minimum, is roughly determined, and the first lens is adjusted to the first axial position.

Since there may be differences in the imaging performance of different first lenses 121, it is necessary to further optimize the focusing positions thereof. By acquiring the first size of the first light spot when the first lens is located at the first axial position, and then determining the second axial position and the third axial position of the first lens 121 in the optical axis direction according to the first size and the relationship between the light spot size and the imaging distance. As can be seen from fig. 5, when the first light spot does not reach the minimum size, the first lens may be located at a position corresponding to under-focus or over-focus corresponding to the same first size, and at this time, it cannot be determined whether the first axial position corresponds to under-focus or over-focus, by adjusting the first lens 121 to the second axial position and the third axial position, respectively, and obtaining the second size and the third size of the first light spot, comparing the first size, the second size, and the third size, the minimum light spot size, i.e., the first minimum light spot size, is obtained, and the position of the first lens 121 corresponding to the first minimum light spot size is closer to the focus position, and the position is taken as the updated first axial position, and the first lens 121 is adjusted to the updated first axial position. By analogy, the position of the first lens 121 in the optical axis direction is continuously adjusted until the minimum spot size acquired at the current time is larger than or equal to the minimum spot size acquired at the previous time, that is, the method is difficult to effectively optimize focusing. Alternatively, considering that the position adjustment of the first lens 121 is not absolutely continuous, when the second distance between the first axial position and the second axial position is smaller than the minimum adjustable distance, the precise adjustment is not actually possible, and the continued adjustment is stopped. Similarly, when the third distance between the first axial position and the third axial position is smaller than the minimum adjustable distance, and the precise adjustment is actually impossible, the continuous adjustment is stopped. Still alternatively, when the fourth accumulated execution time of step S823a is greater than or equal to the second preset time, that is, after the adjustment has been performed multiple times, the adjustment is stopped to improve the adjustment efficiency and avoid multiple invalid repetitions.

Based on the ninth embodiment described above, in the tenth embodiment of the present invention, after the step of adjusting the first lens to the first axial position is performed last time, the method further includes the steps of:

step S824a, determining a fourth axial position of the first lens in the optical axis direction according to the preset step length and the preset direction, and adjusting the first lens to the fourth axial position;

step S824b, acquiring a fourth size of the first light spot when the first lens is located at the fourth axial position;

step S824c, taking a moving direction of the first lens in the optical axis direction when the spot size of the first light spot is changed from large to small before and after the first lens is adjusted to the fourth axial position as an updated preset direction;

step S824 d: returning to execute the step S824a until the number of the cumulatively acquired fourth sizes is greater than or equal to the preset number;

step S824e, determining a relationship between the updated spot size of the lens and the imaging distance according to each fourth axial position and the corresponding fourth size of the first lens;

step S824f, determining a fifth axial position of the first lens in the optical axis direction according to the updated relationship between the spot size of the lens and the imaging distance, and adjusting the first lens to the fifth axial position;

step S825, acquiring a fifth size of the first light spot when the first lens is located at a fifth axial position;

step S826, determining a second minimum spot size of the first size, the second size, the third size, the fourth size, and the fifth size, taking a position of the first lens in the optical axis direction when the spot size of the first spot is the second minimum spot size as a focusing position of the first lens, and adjusting the first lens to the focusing position.

In order to further optimize the focusing position of the first lens 121, based on the specific light path adjusted this time, the relationship between the spot size of the first lens 121 and the imaging distance is fitted, and the imaging distance is determined according to the fitting result, so that a more accurate focusing position is determined. In the fitting process, measuring points are collected according to a preset step length and a preset direction, and specific parameters sampled by each measuring point comprise a fourth axial position and a fourth size of the first light spot. It should be noted that the positions of the measurement points are not acquired according to a single preset direction, but the preset direction is determined according to the direction that the size of the light spot in the current sampling is changed from large to small, so that the acquired measurement points can include the range with the minimum size of the light spot as far as possible, until the number of the acquired measurement points reaches the preset number N. The preset step length can be taken as 2*d₀(N-1) and the minimum adjustable distance, where d₀Is the fitted total range. In some cases, the preset direction may not be determined in the above manner, and then a certain number of measurement points are respectively taken on both sides of the measurement point with the minimum light spot size according to the relationship between the light spot size and the imaging distance of the existing lens, so as to fit the relationship between the light spot size and the imaging distance. Fitting a preset number of fourth axial distances and corresponding fourth sizes to obtain a relationship between the updated spot size R of the lens and the imaging distance Z, where R ═ aZ may be used²A parabolic relationship of + bZ + c is fitted. According to the updated relationship between the spot size of the lens and the imaging distance, determining a fifth axial position of the first lens in the optical axis direction, and adjusting the first lens 121 to the fifth axial position to obtain a fifth size of the first spot, wherein the fifth axial position is a focusing position under an ideal condition, and the fifth size is the minimum size of the first spot. However, in order to further verify the focus position of the first lens 121 in consideration of disturbance and the like during adjustment, the second minimum spot size among the first size, the second size, the third size, the fourth size, and the fifth size obtained above is determined, the position of the first lens in the optical axis direction when the spot size of the first spot is the second minimum spot size is taken as the focus position of the first lens, and the first lens is adjusted to the focus position, so that the focus adjustment of the present optical path is completed.

Based on the above embodiments, in the eleventh embodiment of the present invention, after step S820, the optical path adjusting method further includes the steps of:

step S830, adjusting positions of the first lens and the second lens on a plane perpendicular to the optical axis, so that a third light spot formed by the first imaging light beam on the variable reflector is located within a third preset range of the variable reflector, and a fourth light spot formed by the second imaging light beam on the variable reflector is located within a fourth preset range of the variable reflector;

the third preset range is smaller than or equal to the first preset range, and the fourth preset range is smaller than or equal to the second preset range. In adjusting the respective optical paths, the position of the imaging beam and the focus of the imaging beam often need to be alternately adjusted to gradually approach the optimum state. That is, after the light path is focused, the position of the light spot may be changed, and the position of the light spot needs to be finely adjusted, so that a third light spot formed by the first imaging light beam on the variable reflecting mirror is located within a third preset range of the variable reflecting mirror, and a fourth light spot formed by the second imaging light beam on the variable reflecting mirror is located within a fourth preset range of the variable reflecting mirror, so as to perfect the light path.

Based on the above embodiments, in the twelfth embodiment of the present invention, step S721 includes:

step S721a, when the first included angle is smaller than or equal to the preset angle and the first distance is smaller than or equal to the preset distance, acquiring a sixth size of the first light spot and a seventh size of the second light spot;

step S721b, comparing the sixth size with the first preset size, and comparing the seventh size with the second preset size;

step S721c, when the sixth size is smaller than or equal to the first preset size and the seventh size is smaller than or equal to the second preset size, ending the optical path adjustment;

step S721d, when the sixth size is larger than the first preset size or the seventh size is larger than the second preset size, adjusting the positions of the first lens and the second lens in the optical axis direction so that the first imaging light beam is focused on the imaging plane and the second imaging light beam is focused on the imaging plane.

Since the position of each imaging beam is actually finely adjusted when adjusting the adjustment of the imaging beam, the focusing condition thereof may be affected. Therefore, after the adjustment of the combination of the imaging beams, the focusing condition of the beams needs to be verified and adjusted continuously so that the final imaging can meet the requirements.

The present invention further provides an optical path adjusting apparatus for adjusting an optical path in an optical device, as shown in fig. 1, in an embodiment of the present invention, the optical device includes a first light source 111, a second light source 112, a first lens 121 and a second lens 122, the first lens 121 is located on an emergent light path of the first light source 111, and the second lens 122 is located on an emergent light path of the second light source 112.

Specifically, the optical apparatus 100 in the present embodiment may be a micro projector, and in order to implement color projection, the micro projector is generally provided with a first light source 111, a second light source 112 and a third light source 113 corresponding to three colors of green, red and blue, respectively, and each light source has a first light path, a second light path and a third light path, respectively, and the light paths have substantially similar structures. In order to reduce the space occupied by the optical device such as the micro projector, the first mirror 141, the second mirror 142, the third mirror 143, and the like may be respectively disposed in the first optical path, the second optical path, and the third optical path, so as to change the propagation direction of light and improve the space utilization rate in the optical device. When adjusting the micro projector, the positions of the lenses in the first, second and third optical paths, including the first lens 121, the second lens 122 and the third lens 123, are mainly adjusted, so that the three colors of green, red and blue light can be combined into a color projection image on the imaging plane. It should be noted that the lens here may be a single lens, or may be a lens group capable of meeting certain imaging requirements, and when adjusting the optical path, the adjustment mode of the lens group may refer to the adjustment mode of the single lens, so as to realize the combination of the imaging light beams in different optical paths.

Further, the optical path adjusting apparatus includes a first imaging component 222, a driving component, a memory, a processor, and an optical path adjusting program stored in the memory and executable on the processor, wherein: the first imaging component 220 is located on the light emitting path of the first lens 121, the first imaging component 220 is located on the light emitting path of the second lens 122, and the first imaging component 220 is used for receiving the first light spot and the second light spot; a driving assembly is connected to the first lens 121 and the second lens 122, and the driving assembly is used to adjust the position of the first lens 121 and the position of the second lens 122. The driving assembly can specifically comprise a stepping motor and a transmission system, the transmission system is connected with the stepping motor and each lens, and the position of each lens can be automatically changed through the driving assembly, so that the automatic adjustment of the light path is realized, and the problems of low manual adjustment efficiency, poor accuracy and the like are solved.

Further, as shown in fig. 1, the optical apparatus further includes a variable mirror 130, the variable mirror 130 is located on an outgoing light path of the first lens 121, and the variable mirror 130 is located on an outgoing light path of the second lens 122. In a micro projector, the variable mirror 130 typically includes a Micro Electro Mechanical System (MEMS) to enable projection of various images.

The optical path adjusting device further includes a beam splitter 210 and a second imaging component 230, the beam splitter 210 is located on an exit optical path of the variable reflecting mirror 130, and the first imaging component 220 is located on a first exit optical path of the beam splitter 210; the second imaging assembly 230 is located on the second emergent light path of the beam splitter 210, and the second imaging assembly 230 is configured to receive the first light spot and the second light spot. Specifically, the beam splitter 210 splits each of the imaging beams into two beams to receive the imaging spots, which facilitates adjusting the position and focusing of the imaging beams, respectively. The first imaging component 220 comprises a holographic diffusion screen 221 and a focusing calibration camera 222, and is used for receiving an imaging light spot formed by an imaging light beam, and adjusting focusing by changing the position of a lens in the direction of an optical axis; the second imaging component 230 includes a conjugate lens 231 and a position calibration camera 232 for receiving an imaging spot formed by the imaging beam, and the position of the imaging beam is adjusted by changing the position of the lens on a plane perpendicular to the optical axis direction to improve the imaging effect.

The processor may call the optical path adjustment program stored in the memory and perform the following operations:

determining a third offset according to the first offset and the second offset;

The processor may call a light path adjusting program stored in the memory, and after comparing the first included angle and the preset angle, and the first distance and the preset distance, further perform the following operations:

comparing the first accumulated execution times with a first preset time;

The processor may call a light path adjusting program stored in the memory, and the operation of determining a first offset of the second lens on a plane perpendicular to the optical axis according to the first included angle includes:

Comparing the first included angle α_iAnd the preset angle α₀；

The processor may call an optical path adjustment program stored in the memory, and the operation of determining a second shift amount of the second lens in a plane perpendicular to the optical axis based on the first distance includes:

Comparing the first distance β_jAnd said predetermined distance β₀；

The processor may call an optical path adjusting program stored in the memory, and the operation of determining a third offset according to the first offset and the second offset includes:

The processor can call a light path adjusting program stored in the memory, and the optical device further comprises a variable reflector which is positioned on an emergent light path of the first lens and is positioned on an emergent light path of the second lens;

before the operation of acquiring the first included angle between the first imaging light beam and the second imaging light beam is performed for the first time, the following operations are further performed:

The processor may invoke an optical path adjustment program stored in the memory, and the operation of adjusting the position of the first lens on the plane perpendicular to the optical axis so that the third light spot formed by the first imaging light beam on the variable mirror is located within the first preset range of the variable mirror includes:

The processor may call an optical path adjustment program stored in the memory, and the operation of adjusting the position of the first lens in the optical axis direction to focus the first imaging light beam on the imaging plane includes:

The processor may invoke an optical path adjustment program stored in the memory to perform the following operations after the last time the operation of adjusting the first lens to the first axial position was performed:

The processor may call an optical path adjustment program stored in the memory, and after the operation of adjusting the positions of the first lens and the second lens in the optical axis direction to focus the first imaging beam on the imaging plane and focus the second imaging beam on the imaging plane, further perform the following operations:

The processor may call a light path adjusting program stored in the memory, and when the first included angle is smaller than or equal to the preset angle and the first distance is smaller than or equal to the preset distance, the operation of ending the light path adjustment includes:

The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. An optical path adjusting method for adjusting an optical path in an optical apparatus, the optical apparatus including a first light source, a second light source, a first lens and a second lens, the first lens being located on an exit optical path of the first light source, the second lens being located on an exit optical path of the second light source;

the optical path adjusting method includes the steps of:

determining a third offset according to the first offset and the second offset;

2. The optical path adjusting method according to claim 1, wherein after the step of comparing the first included angle with a preset angle and the first distance with a preset distance, the optical path adjusting method further comprises the steps of:

comparing the first accumulated execution times with a first preset time;

3. The optical path adjustment method according to claim 1, wherein the step of determining a first shift amount of the second lens in a plane perpendicular to the optical axis based on the first angle comprises:

Comparing the first included angle α_iAnd the preset angle α₀；

According to D1_i＝α_i/k1_iCalculating a second cumulative number of executions asi time first offset D1 of the second lens_i；

4. The optical path adjustment method according to claim 1, wherein the step of determining, based on the first distance, a second shift amount of the second lens in a plane perpendicular to the optical axis includes:

Comparing the first distance β_jAnd said predetermined distance β₀；

5. The optical path adjustment method according to claim 1, wherein the step of determining a third offset amount based on the first offset amount and the second offset amount comprises:

determining the center of an overlapping area of the first position adjustment range and the second position adjustment range, and taking the offset corresponding to the center of the overlapping area as the third offset.

6. The optical path adjusting method according to any one of claims 1 to 5, wherein the optical apparatus further includes a variable mirror that is located on an exit optical path of the first lens, and the variable mirror is located on an exit optical path of the second lens;

7. An optical path adjustment method according to claim 6, wherein the step of adjusting the position of the first lens on a plane perpendicular to the optical axis so that a third spot formed on the variable mirror by the first imaging beam is located within a first preset range of the variable mirror comprises:

8. The optical path adjusting method according to claim 6, wherein the step of adjusting the position of the first lens in the optical axis direction to focus the first imaging light beam on the imaging plane includes:

9. The optical path adjusting method according to claim 8, further comprising, after the step of adjusting the first lens to the first axial position is performed last time, the steps of:

10. The optical path adjusting method according to claim 6, wherein after the step of adjusting the positions of the first lens and the second lens in the optical axis direction so that the first imaging light beam is focused on the imaging plane and the second imaging light beam is focused on the imaging plane, the optical path adjusting method further comprises the steps of:

11. The method for adjusting an optical path according to claim 1, wherein when the first included angle is smaller than or equal to the preset angle and the first distance is smaller than or equal to the preset distance, the step of ending the optical path adjustment includes:

12. An optical path adjusting apparatus for adjusting an optical path in an optical device, the optical device comprising a first light source, a second light source, a first lens and a second lens, the first lens being located on an exit optical path of the first light source, the second lens being located on an exit optical path of the second light source;

the optical path adjusting device comprises a first imaging component, a driving component, a memory, a processor and an optical path adjusting program which is stored on the memory and can be operated on the processor, wherein:

the first imaging component is positioned on an emergent light path of the first lens, is positioned on an emergent light path of the second lens and is used for receiving the first light spot and the second light spot;

the driving assembly is connected with the first lens and the second lens and is used for adjusting the position of the first lens and the position of the second lens;

the optical path adjustment program when executed by the processor implements the steps of the optical path adjustment method according to any one of claims 1 to 11.

13. The optical path adjusting apparatus according to claim 12, wherein the optical device further includes a variable mirror, the variable mirror being located on an exit optical path of the first lens, and the variable mirror being located on an exit optical path of the second lens;

the optical path adjusting apparatus further includes:

the beam splitter is positioned on an emergent light path of the variable reflector, and the first imaging component is positioned on a first emergent light path of the beam splitter;

and the second imaging component is positioned on a second emergent light path of the beam splitter and is used for receiving the first light spot and the second light spot.

14. The optical path adjustment apparatus of claim 13, wherein the first imaging component comprises a holographic diffusion screen and a focus calibration camera;

the second imaging component includes a conjugate lens and a position calibration camera.