Optical assembly and laser emitter

Abstract

The embodiment of the application relates to the optical technical field, and discloses an optical assembly and a laser emitter, which comprise a light source, an adjusting module and a lens. By arranging the adjusting module between the light source and the lens, the thicknesses of the first adjusting mirror and the second adjusting mirror in the adjusting module gradually increase in opposite directions, and the first adjusting mirror and the second adjusting mirror can move towards or away from each other, so that, when the light beam penetrates the first adjusting mirror and the second adjusting mirror, the optical path between the light source and the lens changes due to different media; when the first adjusting mirror or the second adjusting mirror moves, the thickness of the position penetrated by the light beam changes, and the optical path between the light source and the lens can be adjusted, so that the optical assembly does not need to be reassembled, and the adjustment process is more convenient and fast.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the technical field of optics, and in particular, to an optical assembly and an optical device. BACKGROUND

[0002] At present, with the development of technology, people's use of light is no longer limited to lighting. In various industries, different light can be used to achieve many technical effects. For example, a laser emission module applied in a vehicle-mounted radar can achieve the effect of accurately obtaining surrounding environment information by emitting laser and receiving feedback. In order to achieve this effect, there is a high requirement for the quality of the light beam. Therefore, a light source is often combined with other optical components to form an optical assembly to adjust the light beam.

[0003] In the actual application of the optical assembly, the parameters of the optical assembly often need to be set in advance when the optical assembly is assembled, such as setting the distance between the light source and the lens in the optical assembly to accurately control the optical path of the light beam in the optical assembly, so that the collimation and diffusion parameters of the light beam processed by the optical assembly can meet the operation requirements. However, the originally set parameters of the optical assembly may change during operation due to various reasons. For example, the optical assembly accumulates a large amount of heat during long-time operation, causing the structural components of the optical assembly to expand due to heat, changing the distance between the components, and thus changing the optical path of the light beam in the optical assembly, affecting the quality of the light beam emitted after being processed by the optical assembly. It is difficult to adjust the assembly parameters of the optical assembly during operation, and it is difficult to ensure the effect of long-time operation of the optical assembly. SUMMARY

[0004] In view of the above problems, embodiments of the present application provide an optical assembly and a laser emitter to solve the problem of difficulty in adjusting the optical path of a laser light source by the optical assembly during operation.

[0005] According to an aspect of an embodiment of the present application, an optical assembly is provided, which comprises: a light source, an adjustment module, and a lens.

[0006] The light source is configured to emit a light beam, and the light beam passes through the adjustment module and is directed to the lens.

[0007] The adjustment module comprises a first adjustment mirror and a second adjustment mirror, both of which are configured to allow the light beam to pass through. The two opposite surfaces of the first adjustment mirror and the second adjustment mirror are parallel to each other. The thickness of the first adjustment mirror gradually increases along a first direction, and the thickness of the second adjustment mirror gradually increases along a second direction. The first direction is opposite to the second direction, and both the first direction and the second direction are perpendicular to the direction of emission of the light beam.

[0008] At least one of the first adjusting mirror and the second adjusting mirror is used to move in the first direction, and the other is used to move in the second direction, so as to change the thickness of the part penetrated by the light beam, and then adjust the optical path of the light beam from the light source to the lens.

[0009] By arranging the adjusting module between the light source and the lens, the thickness of the first adjusting mirror and the second adjusting mirror in the adjusting module gradually increases in opposite directions, and the first adjusting mirror and the second adjusting mirror can move towards or away from each other, so that when the light beam penetrates the first adjusting mirror and the second adjusting mirror, the optical path between the light source and the lens changes due to the difference in medium, and when the first adjusting mirror or the second adjusting mirror moves, the thickness of the part penetrated by the light beam changes, and then the optical path between the light source and the lens can be adjusted, without the need to reassemble the optical assembly, and the adjustment process is more convenient and fast.

[0010] In an optional manner, a base and a connecting seat are further included, the light source and the lens are fixedly connected with the base respectively, the connecting seat is connected between one of the first adjusting mirror and the second adjusting mirror and the base in the first direction, and connected between the other of the first adjusting mirror and the second adjusting mirror and the base in the second direction, and the connecting seat is used to drive one of the first adjusting mirror and the second adjusting mirror to move in the first direction, and the other to move in the second direction.

[0011] By arranging the base and the connecting seat, the light source and the lens are fixedly connected with the base, and the first adjusting mirror and the second adjusting mirror are connected with the base through the connecting seat, so that a relatively stable fixing mode is provided for the light source, the lens and the adjusting module, and the distance between the optical components can be conveniently pre-set during assembly of the optical assembly.

[0012] In an optional manner, the base is used to change the size due to deformation when the temperature of the base changes, so as to drive one of the first adjusting mirror and the second adjusting mirror to move in the first direction, and the other to move in the second direction, so that the thickness of the part penetrated by the first adjusting mirror and the second adjusting mirror changes by a third amount, and then the optical path of the light beam from the light source to the lens changes by a fourth amount.

[0013] The second amount of change and the fourth amount of change offset each other, so that the optical path of the light beam from the light source to the lens remains unchanged.

[0014] By taking the temperature change as the condition for the connecting seat to drive the first adjusting mirror and the second adjusting mirror to move, the thickness of the part penetrated by the first adjusting mirror and the second adjusting mirror can correspond to the deviation in distance between the lens and the light source due to the temperature change in the optical path, so that the adjustment of the optical path by the optical assembly can be automatically performed, and the optical path can be automatically adjusted to the initial state, eliminating the tedious manual operation, and making the use of the optical assembly more convenient.

[0015] In an alternative way, the connecting base comprises a first connecting member and a second connecting member, one end of the first connecting member is connected with the first adjusting mirror, the other end is connected with the base, one end of the second connecting member is connected with the second adjusting mirror, the other end is connected with the base;

[0016] The part of the first connecting member between the end connected with the base and the first adjusting mirror forms a first adjusting part, the part of the second connecting member between the end connected with the base and the second adjusting mirror forms a second adjusting part, the projections of the first adjusting part and the second adjusting part on the plane where the first direction is located in the first direction are equal in length, and are both the first length, the included angle between the incident surface and the exit surface of the first adjusting mirror is equal to the included angle between the incident surface and the exit surface of the second adjusting mirror, the materials of the first adjusting mirror and the second adjusting mirror are the same;

[0017] The distance of the light source to the lens along the light beam emission direction and the first length satisfy the formula:

[0018]

[0019] Wherein, L1 refers to the distance of the light source to the lens along the light beam emission direction, L2 refers to the first length, θ refers to the included angle between the incident surface and the exit surface of the first adjusting mirror, n refers to the refractive index of the material of the first adjusting mirror, a and b respectively refer to the thermal expansion coefficients of the connecting base and the base, and a>b.

[0020] By establishing a functional relationship between the distance of the light source to the lens along the light beam emission direction, the first length, the base CTE, the connecting base CTE, the included angle θ of the end faces of the first adjusting mirror and the second adjusting mirror along the light beam emission direction on the section plane which is parallel to the light beam emission direction and the first direction, and the refractive index of the first adjusting mirror and the second adjusting mirror, the optical assembly thus arranged can automatically compensate for the change in the optical path between the lens and the light source caused by temperature change, so that the optical assembly returns to the originally pre-set state, thereby minimizing the influence of temperature change on the optical path in the optical assembly and improving the stability of the quality of the light beam emitted by the optical assembly.

[0021] In an alternative way, the connecting base and the base are fixedly connected by glue.

[0022] Since solid materials generally have the characteristics of thermal expansion and cold contraction, if the connecting base and the base are connected by clamping, the clamping part of the connecting base and the base will expand at the same time when heated, and when the temperature decreases, the structure may be cracked due to the difference in CTE of the two materials, affecting the durability and stability of the optical assembly. By using glue, the damage probability of the connecting part of the base and the connecting base when the temperature changes is reduced, and the structural strength and durability are improved.

[0023] In an optional mode, the connecting seat is in a strip structure, and the size of the connecting seat along the emission direction of the light beam is smaller than the size of the connecting seat along the first direction.

[0024] By adopting the connecting seat in a strip structure and the size of the connecting seat along the emission direction of the light beam being smaller than the size of the connecting seat along the first direction, the size change of the connecting seat along the first direction or the second direction is more stable when the temperature changes, and is not easily affected by the structure shape. The strip structure makes the connecting seat conduct the temperature more quickly and change the size more timely when the temperature changes, and a certain material can be saved.

[0025] In an optional mode, a rotating device is further included, the rotating device is connected between the base and the connecting seat, and the rotating device is used to drive the connecting seat to rotate in the plane where the first direction is located, so as to drive at least one of the first adjusting mirror and the second adjusting mirror to rotate in the plane where the first direction is located.

[0026] Since the first adjusting mirror and the second adjusting mirror have inclined surfaces, when the light beam is emitted from the light source and penetrates the first adjusting mirror and the second adjusting mirror, the light beam will be offset due to refraction, so that the landing point of the light beam on the lens is offset. At this time, by rotating at least one of the first adjusting mirror or the second adjusting mirror, the refraction direction of the light beam can be changed, so that the landing point of the light beam on the lens can be adjusted, and the applicability of the optical assembly is improved, which provides a solution for the case where the landing point of the light beam needs to be more accurate during the operation of the optical assembly.

[0027] In an optional mode, a screw-nut structure is further included, the screw-nut structure is connected with the connecting seat and at least one of the first adjusting mirror and the second adjusting mirror, and the screw-nut structure is used to drive at least one of the first adjusting mirror and the second adjusting mirror to move along the first direction and the other to move along the second direction.

[0028] By setting the screw-nut structure, the screw-nut structure is used to drive at least one of the first adjusting mirror and the second adjusting mirror to move along the first direction and the other to move along the second direction. Since the transmission of the screw-nut structure has the characteristics of stability and precision, the operator can be more accurate when moving the first adjusting mirror and the second adjusting mirror through the screw-nut structure, and can more conveniently adjust the fine movement distance, so that the use of the optical assembly is more convenient, and the adjustment of the optical path is more accurate.

[0029] In an optional mode, a gap is arranged between the two opposite surfaces of the first adjusting mirror and the second adjusting mirror.

[0030] The gap between the two surfaces of the first adjusting mirror and the second adjusting mirror facing each other is provided, so that the first adjusting mirror and the second adjusting mirror do not immediately contact when moving towards each other, and a certain moving space is reserved. When the adjustment of the optical path requires the first adjusting mirror and the second adjusting mirror to move towards each other, the friction caused by the contact between the two surfaces of the first adjusting mirror and the second adjusting mirror facing each other is prevented, and the movement of the first adjusting mirror and the second adjusting mirror is more smooth and is not easily affected by obstacles.

[0031] According to another aspect of the embodiments of the present application, a laser emitter is provided, comprising a housing and an optical assembly according to any one of the above embodiments;

[0032] The housing is a hollow structure, the optical assembly is arranged in the hollow structure, and the light source is a laser light source.

[0033] By applying the optical assembly to the laser emitter, the optical path can be adjusted by the first adjusting mirror and the second adjusting mirror of the optical assembly during operation. When the optical path in the laser emitter deviates due to temperature changes or other accidents during operation, affecting the quality of the light beam emitted by the laser emitter, the operator can adjust the optical path in the laser emitter according to the actual situation to make the optical path return to normal, to a certain extent, to restore the quality of the light beam emitted by the laser emitter, improve the applicability and controllability of the laser emitter, and provide convenience for the operator.

[0034] The embodiments of the present application change the thickness of the first adjusting mirror and the second adjusting mirror in the adjusting module, so that the optical path of the light beam passing through the first adjusting mirror and the second adjusting mirror also changes. The components in the optical assembly do not need to be disassembled and reassembled, and the optical path in the optical assembly can be conveniently adjusted under different operation requirements, facilitating the use of the optical assembly and improving the controllability of the light beam processed by the optical assembly.

[0035] The above description is only a summary of the technical solutions of the present application. In order to more clearly understand the technical means of the present application, the embodiments can be implemented according to the content of the specification, and in order to make the above and other purposes, characteristics and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0036] Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The accompanying drawings are included to provide a better understanding of the preferred embodiments, and are not considered as limiting the present application. Moreover, the same reference numerals are used throughout the accompanying drawings to designate the same components. In the drawings:

[0037] Figure 1A perspective view of the optical assembly according to an embodiment of the present application;

[0038] Figure 2A A schematic view of the adjustment module in one state according to an embodiment of the present application;

[0039] Figure 2B A schematic view of the adjustment module in another state according to an embodiment of the present application;

[0040] Figure 3 A top view of the optical assembly according to an embodiment of the present application;

[0041] Figure 4 A partial structural schematic view of one embodiment of the adjustment module according to an embodiment of the present application;

[0042] Figure 5 A structural schematic view of the adjustment mirror and the connecting seat according to one embodiment of the present application;

[0043] Figure 6 A structural schematic view of the adjustment mirror and the connecting seat according to another embodiment of the present application.

[0044] The reference signs in the detailed description are as follows:

[0045] 100, optical assembly;

[0046] 110, light source;

[0047] 120, adjustment module, 121, first adjustment mirror, 122, second adjustment mirror;

[0048] 130, lens;

[0049] 140, base;

[0050] 150, connecting seat, 151, first connecting member, 1510, first adjustment part, 152, second connecting member, 1520, second adjustment part;

[0051] 160, screw-nut structure, 161, screw rod, 162, guide rail, 163, handle. DETAILED DESCRIPTION

[0052] The embodiments of the technical scheme of the present application will be described in detail below with reference to the drawings. The following embodiments are only used to more clearly illustrate the technical scheme of the present application, and therefore only serve as examples, and cannot limit the protection scope of the present application.

[0053] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of this application; the use of the terms "including," "comprising," or "having" and variations thereof herein is intended to be broad and encompass the terms "consisting of" and "consisting essentially of" and variations thereof. Unless otherwise noted, the terms "including" and "comprising" are open-ended and do not exclude the presence of unrecited elements or limitations.

[0054] In the description of the embodiments of the present application, the technical terms "first", "second", and the like are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "plurality" is two or more, unless otherwise explicitly and specifically limited.

[0055] Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The occurrence of the phrase in various places in the specification is not necessarily all referring to the same embodiment, nor is it necessarily referring to a separate or alternative embodiment to the other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with each other.

[0056] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, which means that there can be three relationships, for example, A and / or B, which can represent: A exists, A and B exist, and B exists. In addition, the character " / " in this paper generally represents that the front and rear associated objects are a "or" relationship.

[0057] In the description of the embodiments of the present application, the term "plurality" refers to two or more (including two), and similarly, "multiple groups" refers to two or more groups (including two groups), and "multiple pieces" refers to two or more pieces (including two pieces).

[0058] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the embodiments of the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application.

[0059] In the description of the embodiments of the present application, unless otherwise explicitly specified and limited, the technical terms "mounting", "connecting", "connecting", "fixing" and the like should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or can be integrated; can be mechanically connected, or can be electrically connected; can be directly connected, or can be indirectly connected through an intermediate medium, or can be the internal communication of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0060] The present inventors have noticed that the optical assembly in the laser radar is prone to temperature changes due to heat accumulation and the like during long-time operation, so that the size of the components in the optical assembly changes due to thermal expansion and contraction effect, affecting the optical path in the optical assembly which should be precisely controlled by the preset components, resulting in the quality of the finally emitted light beam being affected, which is not conducive to the continuous operation of the optical assembly.

[0061] In view of the above problems, the common solution at present is to select materials with low thermal expansion coefficient as much as possible when the components in the optical assembly are manufactured, so that the size change of the internal components of the optical assembly is small when the optical assembly encounters temperature changes, so as to reduce the influence of temperature changes on the optical path. However, any material will have a certain thermal expansion coefficient, and the internal optical path of the optical assembly will still be affected, and when the factors affecting the optical path are not temperature, since the internal components of the optical assembly are often fixedly arranged in advance, it is difficult for the operator to adjust the optical path of the optical assembly which produces optical path deviation according to the actual situation. Therefore, it is urgent to design an optical assembly which can conveniently adjust the optical path in the optical assembly without disassembling and reassembling the components.

[0062] Based on this, the present inventors have designed an optical assembly by research, which sets an adjusting module between the light source and the lens, changes the thickness of the first adjusting mirror and the second adjusting mirror in the adjusting module, so that the optical path of the light beam passing through the first adjusting mirror and the second adjusting mirror also changes, without disassembling and reassembling the components in the optical assembly, which can conveniently adjust the optical path in the optical assembly under different operation requirements, facilitates the use of the optical assembly, and improves the controllability of the light beam processed by the optical assembly.

[0063] The optical assembly disclosed in the embodiments of the present application can be used for adjusting the optical path of the laser radar, but is not limited to this, and can also be applied to adjusting the optical path of any device or equipment which needs to adjust the optical path of the light source. In the embodiments of the present application, the optical path adjustment for the laser radar is taken as an example for description.

[0064] In the drawings of the embodiments of the present application, straight arrows are used to indicate the direction of movement, which can also be understood as the first direction and the second direction, and double arrows represent the length or distance.

[0065] According to some embodiments of the present application, please refer to Figure 1 , Figure 1 A perspective view of an optical assembly 100 provided by an embodiment of the present application is shown, which provides an optical assembly 100, comprising: a light source 110, an adjusting module 120, and a lens 130.

[0066] The light source 110 is used to emit a light beam, which passes through the adjusting module 120 and is directed to the lens 130.

[0067] The adjusting module 120 comprises a first adjusting mirror 121 and a second adjusting mirror 122, both of which are used for the light beam to pass through. The two opposite surfaces of the first adjusting mirror 121 and the second adjusting mirror 122 are parallel to each other. The thickness of the first adjusting mirror 121 gradually increases along the first direction, and the thickness of the second adjusting mirror 122 gradually increases along the second direction. The first direction is opposite to the second direction, and both the first direction and the second direction are perpendicular to the direction of the light beam emission.

[0068] At least one of the first adjusting mirror 121 and the second adjusting mirror 122 is used to move along the first direction, and the other is used to move along the second direction, so as to change the thickness of the part of the first adjusting mirror 121 and the second adjusting mirror 122 that is penetrated by the light beam, thereby adjusting the optical path of the light beam from the light source 110 to the lens 130.

[0069] The light source 110 in the embodiment refers to a component or device used to emit a light beam. For example, the light source 110 can be a laser light source SPL_S4L90A. The type of light source 110 and the type of light beam can be adjusted according to the actual application scenario. For example, an infrared light source is used in infrared sensing to make the emitted light beam infrared light. Please refer to Figure 1 The purpose of setting the light source 110 is to provide at least one light beam for the optical assembly 100, so as to cooperate with the optical assembly 100 and the supporting device to realize the corresponding function. For example, in a laser radar module, the laser emitted by the light source 110 is directly irradiated on an obstacle after being processed by the optical assembly 100. Part of the laser is reflected by the obstacle, so that the sensor receives the laser reflected by the obstacle, thereby obtaining the obstacle information for subsequent calculation and analysis. In the embodiments of the present application, the light source 110 is taken as an example of a laser light source.

[0070] It should be noted that the light beam emitted by the light source 110 in this embodiment can be multiple or single, and in the drawings, the light beam is idealized as a single dashed line for ease of illustration and understanding. In actual cases, due to production errors or the influence of preset specification parameters of manufacturers, the light beam directly emitted by the light source 110 is often not an absolute parallel light beam, and the light beam emitted by some specifications of the light source 110 can also be greatly divergent. In applications, it is generally necessary to focus or diffuse the light beam directly emitted by the light source 110 through components such as convex lenses or concave lenses, so that the final obtained light beam can meet the actual operation requirements. For example, when the light source 110 is used for projection, the light beam emitted by the light source 110 is diffused through a concave lens to increase the projection area, and when the light source 110 is used for laser radar, the light beam emitted by the light source 110 can be focused through a convex lens to obtain a straight light beam with strong penetration and high light intensity.

[0071] The purpose of setting the lens 130 in this embodiment is to process the light beam emitted by the light source 110, so that the light beam after passing through the lens 130 is focused or diffused. In the production process of the optical assembly 100, the appropriate focusing or diffusion amplitude is often set in advance according to the target operation field, and the important parameter that determines this amplitude is the distance between the lens 130 and the light source 110. Those skilled in the art can understand that the purpose of adjusting the distance between the lens 130 and the light source 110 when assembling the optical assembly 100 is to adjust the optical path of the light beam emitted by the light source 110 from the light source 110 to the lens 130. The essence of the optical path is the distance traveled by light in a medium converted into the corresponding distance traveled by light in a vacuum. Under the same distance, the optical path of light in the same distance will be different when the medium through which the light passes is different. When the optical path between the lens 130 and the light source 110 remains unchanged, the quality of the light beam processed by the lens 130 also remains unchanged. When the optical path between the lens 130 and the light source 110 changes, the quality of the light beam processed by the lens 130 will also change.

[0072] The purpose of setting the first adjusting mirror 121 and the second adjusting mirror 122 is to adjust the optical path of the light beam emitted by the light source 110. In order to ensure that the thickness change of the first adjusting mirror 121 and the second adjusting mirror 122 is more controllable, those skilled in the art should understand that the incident surface and the refractive surface of the first adjusting mirror 121 and the second adjusting mirror 122 do not need to be provided with an arc for focusing or diffusing light.

[0073] By setting the adjusting module 120 between the light source 110 and the lens 130, the thicknesses of the first adjusting mirror 121 and the second adjusting mirror 122 in the adjusting module 120 gradually increase in opposite directions, and the first adjusting mirror 121 and the second adjusting mirror 122 can move towards or away from each other, so that when the light beam penetrates the first adjusting mirror 121 and the second adjusting mirror 122, the optical path between the light source 110 and the lens 130 changes due to the different media, and when the first adjusting mirror 121 or the second adjusting mirror 122 moves, the thickness of the position penetrated by the light beam changes, thereby adjusting the optical path between the light source 110 and the lens 130, without the need to reassemble the optical assembly 100, and the adjustment process is more convenient and fast.

[0074] According to some embodiments of the present application, please continue to refer to Figure 1 Further comprising a base 140 and a connecting seat 150, the light source 110 and the lens 130 are fixedly connected to the base 140 respectively, the connecting seat 150 is connected to one of the first adjusting mirror 121 and the second adjusting mirror 122 and the base 140 in a first direction, and connected to the other of the first adjusting mirror 121 and the second adjusting mirror 122 and the base 140 in a second direction, the connecting seat 150 is used to drive one of the first adjusting mirror 121 and the second adjusting mirror 122 to move in the first direction, and the other to move in the second direction.

[0075] The base 140 is used to provide fixation for the light source 110, the lens 130 and the connecting seat 150, in order to enable the connecting seat 150 connected to the base 140 to drive the first adjusting mirror 121 and the second adjusting mirror 122 to move in opposite directions, according to actual needs, the base 140 can be a hollow cylindrical structure, and the light source 110, the lens 130 and the connecting seat 150 are all connected to the inner wall of the base 140; the base 140 can also be a plate structure, and the connecting seat 150, the first adjusting mirror 121 and the second adjusting mirror 122 are arranged on both sides of the same face of the base 140.

[0076] The connecting seat 150 is used to fix the first adjusting mirror 121 and the second adjusting mirror 122 on the base 140, in an embodiment, the connecting seat 150 is a concave structure with protrusions at both ends, the first adjusting mirror 121 and the second adjusting mirror 122 are fixed on the protrusions at both ends of the connecting seat 150 respectively, and guide rails 162 or telescopic rods are arranged on the protrusions at both ends of the connecting seat 150 to drive the first adjusting mirror 121 and the second adjusting mirror 122 to move. It can be understood that the connecting seat 150 and the base 140 jointly fix the light source 110, the lens 130, the first adjusting mirror 121 and the second adjusting mirror 122, in order to achieve an ideal fixing effect, the connecting seat 150 and the base 140 should be made of a relatively hard material, such as aluminum alloy.

[0077] The base 140 and the connecting seat 150 are arranged to fix the light source 110 and the lens 130 to the base 140, and to connect the first adjusting mirror 121 and the second adjusting mirror 122 to the base 140 through the connecting seat 150, so that the light source 110, the lens 130 and the adjusting module 120 are provided with a relatively stable fixing mode, and the distance between the optical components can be conveniently pre-set during assembly of the optical assembly 100.

[0078] According to some embodiments of the present application, please refer to Figure 1 , and further refer to Figure 2A and Figure 2B , Figure 2A for a schematic diagram of the adjusting module in one state provided by the embodiments of the present application, Figure 2B for a schematic diagram of the adjusting module in another state provided by the embodiments of the present application, the base 140 is used to change the size due to deformation when the temperature of the base 140 changes, so as to produce a first change in the distance between the lens 130 and the light source 110, and further produce a second change in the optical path of the light beam from the light source 110 to the lens 130;

[0079] The connecting seat 150 is used to change the size due to deformation when the temperature of the connecting seat 150 changes and is consistent with the temperature change of the base 140, so as to drive one of the first adjusting mirror 121 and the second adjusting mirror 122 to move in the first direction, and the other to move in the second direction, so that the thickness of the part where the first adjusting mirror 121 and the second adjusting mirror 122 are penetrated by the light beam produces a third change, and further the optical path of the light beam from the light source 110 to the lens 130 produces a fourth change;

[0080] The second change and the fourth change offset each other, so that the optical path of the light beam from the light source 110 to the lens 130 remains unchanged.

[0081] Wherein, due to the common thermal expansion and contraction property of materials, when the temperature changes, the material expands corresponding to its coefficient of thermal expansion (CTE), which is a physical quantity that measures the degree of thermal expansion of a solid material, and is the relative change in length or volume of an object per unit length or volume when the temperature rises by 1℃. The coefficient of thermal expansion is abbreviated as CTE. For convenience of description, CTE refers to the coefficient of thermal expansion in the following description.

[0082] We can derive the design proposed in the embodiments through a series of formulas, please refer to Figure 3 , Figure 3This is a top view of the optical component provided in an embodiment of the present invention. Let the CTE of the constituent material of the connector 150 be a, the CTE of the constituent material of the base 140 be b, the distance between the lens 130 and the light source 110 be L1, and the shortest distance from the end of the connector 150 connected to the base 140 to the first adjusting mirror 121 (i.e., the length of the portion of the connector 150 connecting the first adjusting mirror 121 and the base 140) be L2. Let the angle between the incident and exit surfaces of the first adjusting mirror 121 or the second adjusting mirror 122 be θ. Then, the formula for the change in the distance L1 between the lens 130 and the light source 110 with temperature changes can be obtained: ΔL1 = L1 * b. Multiplying ΔL1 by the refractive index of the medium through which the light beam passes in the optical component 100 gives the change in the distance L1 of the optical component 100 when the temperature of the optical component 100 changes. The change in optical path of the light beam emitted by source 110 is approximately 1, given that the refractive index of air is 1.00029. Therefore, the change in optical path of the light beam emitted by source 110 in optical component 100 is ΔL1*1, which is ΔL1. When the optical path of the light beam emitted by source 110 in optical component 100 changes by ΔL1, in order to ensure that the quality of the light beam emitted after passing through lens 130 is consistent with that before the temperature change, ΔL1 should be used as a compensation amount. The same value should be used to compensate the optical path in subsequent adjustments. In this embodiment, the temperature change of connector 150 causes a change in its size, which moves the first adjustment mirror 121 and the second adjustment mirror 122. This causes the light beam to pass through the thickness of the first adjustment mirror 121 and the second adjustment mirror 122, thus adjusting the optical path. This allows the change in optical path after adjustment to cancel out ΔL1. The following is the formula derivation process.

[0083] Based on the CTE materials of the connecting seat 150 and the base 140, the formula for the relative displacement of the first adjusting mirror 121 and the second adjusting mirror 122 can be derived: 2ΔL2=2L2*(ab), where, as Figure 3 As shown, since the connecting seat 150 is connected to the base 140, when the base 140 deforms due to temperature changes, in addition to moving the lens 130 away from the light source 110, it will also move the connecting seat 150. Therefore, it is necessary to remove the amount of movement of the connecting seat 150 caused by the thermal expansion coefficient of the base 140, so that the size change of the connecting seat 150 during temperature changes is the actual change in the movement of the first adjusting mirror 121 and the second adjusting mirror 122 after taking into account the amount of movement of the connecting seat 150 caused by the thermal expansion coefficient of the base 140.

[0084] Please refer to the above again. Figure 2A and Figure 2B , Figure 2A In the diagram, A represents the equivalent planar glass portion penetrated by the light beam when the first adjusting mirror 121 and the second adjusting mirror 122 are in a stationary state. Figure 2BThe middle B is a plane glass equivalent to the part of the first adjusting mirror 121 and the second adjusting mirror 122 penetrated by the light beam after the first adjusting mirror 121 and the second adjusting mirror 122 move towards each other by Δm, and the relative Figure 2A The thickness of the middle A changes by Δh, and the thickness of the part of the first adjusting mirror 121 and the second adjusting mirror 122 penetrated by the light beam is understood as the height of the triangle according to the actual change of the first adjusting mirror 121 and the second adjusting mirror 122, and the formula of the thickness change Δh of the part of the first adjusting mirror 121 and the second adjusting mirror 122 penetrated by the light beam can be calculated according to the calculation method of the height of the triangle: Δh = 2ΔL2*tanθ.

[0085] Please continue to refer to Figure 2B According to the material of the first adjusting mirror 121 and the second adjusting mirror 122, the refractive index of the material is known, and the thickness change of the part of the first adjusting mirror 121 and the second adjusting mirror 122 penetrated by the light beam is combined with the above formula, and the change of the optical path affected by the thickness change of the part of the first adjusting mirror 121 and the second adjusting mirror 122 penetrated by the light beam can be obtained, that is, the optical path of the part of the light beam penetrated by Δh is Δh*(n-1), and when the change of the optical path affected by the thickness change of the part of the first adjusting mirror 121 and the second adjusting mirror 122 penetrated by the light beam is consistent with the change of the optical path affected by the temperature change, the error of the optical path after the temperature change can be compensated, that is, the formula ΔL1 = Δh*(n-1) is satisfied.

[0086] By taking the temperature change as the condition for the connecting seat 150 to drive the first adjusting mirror 121 and the second adjusting mirror 122 to move, the thickness of the part of the first adjusting mirror 121 and the second adjusting mirror 122 penetrated by the light beam can correspond to the deviation in distance between the lens 130 and the light source 110 due to the temperature change, so that the adjustment of the optical path of the optical assembly 100 can be automatically performed, and the optical path can be automatically adjusted to the initial state, avoiding the tedious manual operation, and making the use of the optical assembly 100 more convenient.

[0087] According to some embodiments of the present application, and further referring to Figure 4 , Figure 4 Part of the structure schematic diagram of one embodiment of the adjusting module provided by the embodiments of the present application is shown, the connecting seat 150 includes a first connecting piece 151 and a second connecting piece 152, one end of the first connecting piece 151 is connected with the first adjusting mirror 121, and the other end is connected with the base 140, one end of the second connecting piece 152 is connected with the second adjusting mirror 122, and the other end is connected with the base 140;

[0088] The first connecting member 151 forms a first adjusting part 1510 between the end connected with the base 140 and the first adjusting mirror 121, and the second connecting member 152 forms a second adjusting part 1520 between the end connected with the base 140 and the second adjusting mirror 122, the projections of the first adjusting part 1510 and the second adjusting part 1520 on the plane where the first direction is located have equal lengths in the first direction, and the lengths are the first length, the included angle between the incident surface and the exit surface of the first adjusting mirror 121 is equal to the included angle between the incident surface and the exit surface of the second adjusting mirror 122, and the materials of the first adjusting mirror 121 and the second adjusting mirror 122 are the same;

[0089] The distance of the light source 110 to the lens 130 along the light beam emitting direction satisfies the formula:

[0090]

[0091] Wherein, L1 refers to the distance of the light source 110 to the lens 130 along the light beam emitting direction, L2 refers to the first length, θ refers to the included angle between the incident surface and the exit surface of the first adjusting mirror 121, n refers to the refractive index of the material of the first adjusting mirror 121, a and b respectively refer to the thermal expansion coefficients of the connecting base 150 and the base 140, and a>b.

[0092] It should be noted that the incident surface of the first adjusting mirror 121 refers to the surface first passed through by the light beam, and the exit surface refers to the surface last passed through by the light beam, that is, the light beam enters from the incident surface of the first adjusting mirror 121 and exits from the exit surface, and the included angle between the incident surface and the exit surface of the first adjusting mirror 121 is θ, and the included angle between the incident surface and the exit surface of the second adjusting mirror 122 is also θ.

[0093] Please refer to Figure 2A and Figure 2B The formula can be derived from the formula ΔL1=Δh*(n-1) in the above embodiment, and Δh=2ΔL2*tanθ is substituted to obtain

[0094] ΔL1=2ΔL2*tanθ*(n-1), 2ΔL2=2L2*(a-b) is substituted to obtain ΔL1=2L2*(a-b)*tanθ*(n-1), at this time, it is still difficult to determine the specific structure of the optical assembly 100 according to the formula, therefore, the formula is transformed to obtain: In the setting of the optical assembly, L1 can be set in advance according to actual needs, and then the value of L1 is substituted into the formula, the materials of the base 140, the connecting seat 150, the first adjusting mirror 121 and the second adjusting mirror 122 are flexibly selected, the angle θ of the first adjusting mirror 121 and the second adjusting mirror 122 is set appropriately, and L2 is set appropriately so that the above formula is established, that is, the optical assembly 100 can realize automatic compensation of the optical path. In actual application, the parameters in the above formula can be set without distinction of priority, and those skilled in the art can determine the parameters in the above formula in a suitable order according to actual needs, so that the formula can be established.

[0095] It should be noted that, since the thickness of the first adjusting mirror 121 gradually increases along the first direction, the thickness of the second adjusting mirror 122 gradually increases along the second direction, and the two opposite surfaces thereof are parallel to each other, there must be two inclined surfaces on the first adjusting mirror 121 and the second adjusting mirror 122 with opposite inclination directions, so that the optical path of the light beam emitted by the light source 110 is deflected, resulting in a shift of the landing point of the light beam on the lens 130. In one setting mode, please refer to Figure 2A and Figure 2B , the two inclined surfaces of the first adjusting mirror 121 and the second adjusting mirror 122 are arranged oppositely, and the greater the distance between the first adjusting mirror 121 and the second adjusting mirror 122, the greater the shift of the landing point of the light beam on the lens 130; in another setting mode, please refer to Figure 4 , the two inclined surfaces of the first adjusting mirror 121 and the second adjusting mirror 122 are arranged oppositely and parallel to each other, and the greater the inclination angle of the first adjusting mirror 121 and the second adjusting mirror 122, the greater the shift of the landing point of the light beam on the lens 130.

[0096] Generally, through the setting modes of the above two embodiments, even if the landing point of the light beam on the lens 130 is shifted, it will not have a great impact on the quality of the light beam. However, in some application scenarios, the quality of the light beam emitted by the optical assembly 100 after passing through the lens 130 is required to be high during the operation process. For example, when the optical assembly 100 according to the embodiments of the present application is applied to a laser radar module, if the shift of the landing point of the light beam on the lens 130 is too large, it may cause errors in the radar scanning result. At this time, if the first adjusting mirror 121 and the second adjusting mirror 122 are arranged in the setting modes of Figure 2A and Figure 2B , the gap between the first adjusting mirror 121 and the second adjusting mirror 122 can be reduced to reduce the shift of the landing point of the light beam on the lens 130 according to actual conditions, without changing the included angle θ. If the setting modes of Figure 4With this setup, when the offset of the beam's landing point on lens 130 is large, reducing the offset can only be achieved by narrowing the included angle θ and lowering the refraction angle. In actual operation, this means replacing different first adjusting mirrors 121 and second adjusting mirrors 122, which is cumbersome and inconvenient for operators. Therefore, preferably, the first adjusting mirror 121 and second adjusting mirror 122 can be selected... Figure 2A and Figure 2B The setup shown is designed to overcome the problems of large landing point offset and cumbersome component replacement steps. It should be noted that, since it is necessary to ensure that at least one of the first adjusting mirror 121 and the second adjusting mirror 122 can move along the first direction and the other can move along the second direction, if the gap between the first adjusting mirror 121 and the second adjusting mirror 122 is not maintained at all, the first adjusting mirror 121 and the second adjusting mirror 122 will not be able to move towards each other along the first direction and the second direction respectively. Therefore, those skilled in the art should be able to reasonably set the gap between the first adjusting mirror 121 and the second adjusting mirror 122 according to actual needs.

[0097] In some cases, to strengthen the connection between the connecting seat 150 and the first adjusting mirror 121 and the second adjusting mirror 122, such as Figure 5 As shown, Figure 5 This is a schematic diagram of the structure of an adjusting mirror and a connecting seat according to an embodiment of the present invention. The connecting seat 150 can extend from the edge of the first adjusting mirror 121 or the second adjusting mirror 122. By increasing the connection area and supporting the first adjusting mirror 121 or the second adjusting mirror 122, the connection strength is improved. It should be noted that since the first length needs to be included in the calculation of the distance by which the connecting seat 150 moves one of the first adjusting mirror 121 or the second adjusting mirror 122 along the first or second direction, the length of the moving distance depends on the product of the material CTE of the connecting seat 150 and the length of the portion capable of moving the first adjusting mirror 121 or the second adjusting mirror 122. Those skilled in the art will understand that when using… Figure 5 In the case of the arrangement shown or similar, it is obvious that the supporting part of the connecting seat 150 cannot directly drive the first adjusting mirror 121 or the second adjusting mirror 122 to move when thermal expansion occurs. Therefore, the first length L2 should not include the supporting part of the connecting seat 150 for the first adjusting mirror 121 or the second adjusting mirror 122.

[0098] The formula is formed by establishing a functional relationship between the distance of the light source 110 to the lens 130 along the light beam emission direction, the first length, the CTE of the base 140, the CTE of the connecting seat 150, the included angle θ formed by the end faces of the first adjusting mirror 121 and the second adjusting mirror 122 along the two ends of the light beam emission direction in the cross section of the plane parallel to the light beam emission direction and the first direction as the cross section plane, and the refractive index of the first adjusting mirror 121 and the second adjusting mirror 122, so that the optical assembly 100 thus arranged can automatically compensate for the change in the optical path between the lens 130 and the light source 110 caused by temperature change, so that the optical assembly 100 returns to the originally pre-set state, thereby minimizing the influence of temperature change on the optical path in the optical assembly 100 and improving the stability of the quality of the light beam emitted by the optical assembly 100.

[0099] According to some embodiments of the present application, the connecting seat 150 and the base 140 are fixedly connected by glue.

[0100] Further, in order to make the connecting part of the connecting seat 150 and the base 140 less affected by temperature change, the glue can be high-temperature-resistant glue, and according to actual needs, rubber, silicone or other materials can be used as adhesive to fixedly connect the connecting seat 150 and the base 140.

[0101] Since solid materials generally have the characteristics of thermal expansion and cold contraction, if the connecting seat 150 and the base 140 are clamped, the clamping part of the connecting seat 150 and the base 140 will expand at the same time when heated, and when the temperature decreases, the structure may be cracked due to the difference in CTE of the two materials, affecting the durability and stability of the optical assembly 100. By using glue, the damage probability of the connecting part of the base 140 and the connecting seat 150 is reduced when the temperature changes, and the structural strength and durability are improved.

[0102] According to some embodiments of the present application, the connecting seat 150 is in a strip-shaped structure, and the size of the connecting seat 150 along the light beam emission direction is smaller than the size of the connecting seat 150 along the first direction.

[0103] By using the connecting seat 150 in a strip-shaped structure and having a size along the light beam emission direction smaller than the size of the connecting seat 150 along the first direction, the size of the connecting seat 150 along the first direction or the second direction changes more stably when the temperature changes, and is less affected by the structure shape. When the temperature changes, the strip-shaped structure makes the connecting seat 150 conduct heat more quickly, the size changes more timely, and a certain amount of material can be saved.

[0104] According to some embodiments of the present application, a rotating device is further included, which is connected between the base 140 and the connecting seat 150, and is used to drive the connecting seat 150 to rotate in the plane where the first direction is located, so as to drive at least one of the first adjusting mirror 121 and the second adjusting mirror 122 to rotate in the plane where the first direction is located.

[0105] According to the shape of the base 140, the rotating device should also have a corresponding different setting. For example, when the base 140 is a cylindrical structure, the rotating device should also be a cylindrical structure and the outer wall is connected with the inner wall of the base 140, the connecting seat 150 is connected to the inner wall of the rotating device, and the outer wall of the rotating device and the inner wall of the base 140 can be connected through a guide rail 162 or a self-lubricating structure, so that the rotating device can rotate relative to the base 140, so as to drive the connecting seat 150 to rotate in the plane where the first direction is located, so as to drive at least one of the first adjusting mirror 121 and the second adjusting mirror 122 to rotate in the plane where the first direction is located. When the base 140 is a flat panel structure, the rotating device can be a circular frame or a semicircular structure, the connecting seat 150 is arranged in the inner frame of the circular frame or the inner arc, and the rotating device and the connecting seat 150 are movably connected, so that the connecting seat 150 can move along the edge of the circular frame or the semicircular structure, so as to achieve the effect of driving at least one of the first adjusting mirror 121 and the second adjusting mirror 122 to rotate in the plane where the first direction is located.

[0106] Since the first adjusting mirror 121 and the second adjusting mirror 122 have inclined surfaces, when the light beam is emitted from the light source 110 and penetrates the first adjusting mirror 121 and the second adjusting mirror 122, the light beam will be offset due to refraction, so that the landing point of the light beam on the lens 130 is offset. At this time, by rotating at least one of the first adjusting mirror 121 or the second adjusting mirror 122, the refraction direction of the light beam can be changed, so that the landing point of the light beam on the lens 130 can be adjusted, thereby improving the applicability of the optical assembly 100 and providing a solution for the case that the light beam landing point needs to be more accurate during the operation of the optical assembly 100.

[0107] According to some embodiments of the present application, please refer to Figure 6 , Figure 6 The structure diagram of the adjusting mirror and the connecting seat provided for another embodiment of the present application further includes a screw nut structure 160, which is connected with the connecting seat 150 and at least one of the first adjusting mirror 121 and the second adjusting mirror 122, and is used to drive at least one of the first adjusting mirror 121 and the second adjusting mirror 122 to move in the first direction and the other to move in the second direction.

[0108] As Figure 6As shown, the guide rail 162 in the screw nut structure 160 is rotatably connected with at least one of the first adjusting mirror 121 and the second adjusting mirror 122, the screw rod 161 penetrates the connecting base 150 and extends out of the other end of the connecting base 150 and is connected with the handle 163, the through hole in the connecting base 150 penetrated by the screw rod 161 should be provided with a threaded structure matched with the screw rod 161, the guide rail 162 is used to provide support for the connecting base 150 connected by the screw nut structure 160, so that when the screw rod 161 rotates, one of the first adjusting mirror 121 and the second adjusting mirror 122 moves in the direction of the guide rail 162, which should be opposite or consistent with the first direction. The above embodiment only gives one assembly mode of the screw nut structure 160, and different assembly modes can also be used to realize the movement of the first adjusting mirror 121 and / or the second adjusting mirror 122 in the optical assembly 100 according to actual conditions and operation needs, which is not specially limited in the embodiment of the application.

[0109] By providing the screw nut structure 160, the screw nut structure 160 is used to drive at least one of the first adjusting mirror 121 and the second adjusting mirror 122 to move in the first direction, and the other to move in the second direction. Since the transmission of the screw nut structure 160 has the characteristics of stability and precision, the operator can move the first adjusting mirror 121 and the second adjusting mirror 122 more accurately when driving them to move through the screw nut structure 160, and can more conveniently adjust the fine movement distance, so that the use of the optical assembly 100 is more convenient and the adjustment of the optical path is more accurate.

[0110] According to some embodiments of the application, a gap is provided between the two opposite surfaces of the first adjusting mirror 121 and the second adjusting mirror 122.

[0111] By providing a gap between the two opposite surfaces of the first adjusting mirror 121 and the second adjusting mirror 122, the first adjusting mirror 121 and the second adjusting mirror 122 do not immediately contact when moving towards each other, leaving a certain movement space. When the adjustment of the optical path requires the first adjusting mirror 121 and the second adjusting mirror 122 to move towards each other, the contact between the two opposite surfaces of the first adjusting mirror 121 and the second adjusting mirror 122 is prevented from producing friction and hindering movement, so that the movement of the first adjusting mirror 121 and the second adjusting mirror 122 is smoother and less likely to be affected by movement, thereby affecting the effect of the first adjusting mirror 121 and the second adjusting mirror 122 on the adjustment of the optical path.

[0112] According to another embodiment of the application, a laser emitter is provided, comprising a shell and the optical assembly 100 according to any one of the above embodiments.

[0113] The shell is a hollow structure, the optical assembly 100 is arranged in the hollow structure, and the light source 110 is a laser light source 110.

[0114] By applying the optical assembly 100 on the laser emitter, the optical assembly 100 can adjust the optical path by the first adjusting mirror 121 and the second adjusting mirror 122 during the operation process. When the optical path in the laser emitter deviates due to temperature changes or other accidents during the operation process, affecting the quality of the light beam emitted by the laser emitter, the operator can adjust the optical path in the laser emitter to return to normal by moving the first adjusting mirror 121 and the second adjusting mirror 122 in the optical assembly 100 according to the actual situation, to a certain extent, to restore the quality of the light beam emitted by the laser emitter, improve the applicability and controllability of the laser emitter, and provide convenience for the operator.

[0115] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application, and they should be covered in the scope of the claims and the specification of the present application. Especially, as long as there is no structural conflict, the technical features mentioned in each embodiment can be combined in any way. The present application is not limited to the specific embodiments disclosed in the text, but includes all technical solutions falling within the scope of the claims.

Claims

1. An optical component, characterized in that, The optical assembly comprises: a light source, an adjusting module and a lens; the light source is configured to emit a light beam, the light beam passes through the adjusting module and is directed to the lens; the adjusting module comprises a first adjusting mirror and a second adjusting mirror, the first adjusting mirror and the second adjusting mirror are configured to be penetrated by the light beam, two opposite surfaces of the first adjusting mirror and the second adjusting mirror are parallel to each other, the thickness of the first adjusting mirror gradually increases along a first direction, the thickness of the second adjusting mirror gradually increases along a second direction, the first direction is opposite to the second direction, and the first direction and the second direction are both perpendicular to the direction in which the light beam is emitted; at least one of the first adjusting mirror and the second adjusting mirror is configured to move along the first direction, and the other is configured to move along the second direction, so as to change the thickness of the part of the first adjusting mirror and the second adjusting mirror penetrated by the light beam, thereby adjusting the optical path of the light beam from the light source to the lens; the optical assembly further comprises a base and a connecting seat, the light source and the lens are fixedly connected to the base, the connecting seat is connected between one of the first adjusting mirror and the second adjusting mirror and the base along the first direction, and between the other of the first adjusting mirror and the second adjusting mirror and the base along the second direction, and the connecting seat is configured to drive one of the first adjusting mirror and the second adjusting mirror to move along the first direction and the other to move along the second direction; the base is configured to change its size due to deformation when its temperature changes, so as to cause a first change in the distance between the lens and the light source, and thereby cause a second change in the optical path of the light beam from the light source to the lens; the connecting seat is configured to change its size due to deformation when its temperature changes and is consistent with the temperature change of the base, so as to drive one of the first adjusting mirror and the second adjusting mirror to move along the first direction and the other to move along the second direction, so that the thickness of the part of the first adjusting mirror and the second adjusting mirror penetrated by the light beam changes by a third amount, and thereby the optical path of the light beam from the light source to the lens changes by a fourth amount; the second change and the fourth change offset each other, so that the optical path of the light beam from the light source to the lens remains unchanged.

2. The optical assembly of claim 1, wherein, the connecting seat comprises a first connecting member and a second connecting member, one end of the first connecting member is connected to the first adjusting mirror, and the other end is connected to the base, one end of the second connecting member is connected to the second adjusting mirror, and the other end is connected to the base; The first connecting member forms a first adjusting part between the end connected with the base and the first adjusting mirror, and the second connecting member forms a second adjusting part between the end connected with the base and the second adjusting mirror, the projections of the first adjusting part and the second adjusting part on the plane where the first direction lies have equal length in the first direction, and the length is a first length, the included angle between the incident plane and the emergent plane of the first adjusting mirror is equal to the included angle between the incident plane and the emergent plane of the second adjusting mirror, and the materials of the first adjusting mirror and the second adjusting mirror are the same; The distance from the light source to the lens along the light beam emitting direction and the first length satisfy the formula: wherein, refers to a preset distance of the light source to the lens along the light beam emission direction, refers to the first length, refers to an included angle between the incident surface and the exit surface of the first adjusting mirror, refers to a material refractive index of the first adjusting mirror, and respectively refer to material thermal expansion coefficients of the connecting seat and the base, and .

3. The optical assembly of claim 1, wherein, The connecting seat and the base are fixedly connected by glue.

4. The optical assembly of claim 1, wherein, The connecting seat is in a strip structure, and the size of the connecting seat along the light beam emitting direction is smaller than the size of the connecting seat along the first direction.

5. The optical assembly of claim 1, wherein, Further comprising a rotating device connected between the base and the connecting seat, the rotating device is used to drive the connecting seat to rotate on the plane where the first direction lies, so that the connecting seat drives at least one of the first adjusting mirror and the second adjusting mirror to rotate on the plane where the first direction lies.

6. The optical assembly of claim 1, wherein, Further comprising a screw nut structure connected with the connecting seat and at least one of the first adjusting mirror and the second adjusting mirror, the screw nut structure is used to drive at least one of the first adjusting mirror and the second adjusting mirror to move along the first direction, and the other to move along the second direction.

7. The optical assembly of any of claims 1-6, wherein, The first adjusting mirror and the second adjusting mirror are provided with a gap between the two opposite surfaces.

8. A laser transmitter, characterized by The optical assembly comprises a shell and the optical assembly as claimed in any one of claims 1-7. The shell is a hollow structure, the optical assembly is arranged in the hollow structure, and the light source is a laser light source.

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