Beam collimation assembly and laser emitting device

Abstract

The embodiment of the application relates to the optical technical field, discloses a kind of light beam collimation assembly and laser emitting device, the light beam collimation assembly includes lens, lens has first processing surface and second processing surface;First processing surface is arc surface along second direction, first processing surface is used to carry out divergence angle compression processing to the light beam emitted by light source in second direction, wherein, second direction is perpendicular to first direction;Second processing surface is a surface of revolution, and second processing surface is used to collimate the light beam that passes through first processing surface and compensate at least part of the optical path difference formed by the light beam that passes through first processing surface.By the above mode, the collimation effect of the light source with the strip-shaped outer contour of the light emitting area can be improved.

Description

Technical Field

[0001] This application relates to the field of optical technology, specifically to a beam collimation component and a laser emitting device. Background Technology

[0002] With the development of technology, in addition to the application of light in the lighting field, more and more technologies are beginning to utilize light. For example, in the field of lidar ranging, pulsed lasers are emitted to hit the target object, scattering light waves. A portion of the light waves are reflected to the receiver, thereby achieving the ranging of the target object.

[0003] The transmitting end of a lidar system is generally divided into three types: surface light source, line light source, and point light source. Among them, point light source and line light source have very high requirements for beam collimation. The higher the collimation, the higher the energy density of the beam at the transmitting end, and the higher the proportion of energy received by the receiving end from the transmitting end.

[0004] For a single point light source, a good collimation effect can be achieved simply by aligning its optical axis with the center of the collimating lens. However, for a line light source (that is, the outer contour of the light-emitting area is strip-shaped) or multiple point light sources along a strip array, it is difficult to achieve a good collimation effect for all emitted beams due to the certain area of ​​the light-emitting area. Summary of the Invention

[0005] In view of the above problems, embodiments of this application provide a beam collimation component and a laser emitting device to improve the collimation effect on a light source with a striped outer contour of the emitting area.

[0006] According to one aspect of the embodiments of this application, a beam collimation assembly is provided for collimating a light source whose outer contour of the emitting region is strip-shaped along a first direction. The beam collimation assembly includes a lens having a first processing surface and a second processing surface. The first processing surface is arc-shaped along a second direction and is used to compress the divergence angle of the light beam emitted by the light source in the second direction, wherein the second direction is perpendicular to the first direction. The second processing surface is a rotationally symmetric curved surface and is used to collimate the light beam passing through the first processing surface and compensate for the optical path difference formed by at least a portion of the light beam passing through the first processing surface.

[0007] In one alternative embodiment, the first processing surface and the second processing surface are respectively disposed on the incident surface and the exit surface of the lens.

[0008] In one alternative embodiment, the lens includes a first lens and a second lens, with a first processing surface disposed on the first lens and a second processing surface disposed on the second lens.

[0009] In one alternative, a beam collimation assembly is used to collimate a light source comprising a plurality of emitting positions distributed along a first direction, and a second processing surface is configured such that, along a second direction, the light beams emitted from each emitting position of the light source, having the largest angle between their beams and the optical axis of that emitting position and being biased to both sides, are respectively incident on both sides of the central axis of the second processing surface.

[0010] In one alternative approach, the optical power ratio of the first processing surface is any value between 40% and 120%, and the optical power ratio of the second processing surface is any value between -20% and 60%, wherein the optical power ratio of the second processing surface is not 0, and the sum of the optical power ratios of the first and second processing surfaces is 100%.

[0011] In one alternative approach, the optical power ratio of the first processing surface is any value within the range of 70% or greater and less than 100%, and the optical power ratio of the second processing surface is any value within the range of 0% or less and less than 30%.

[0012] In one alternative approach, the first processing surface includes a plurality of first sub-processing surfaces, and the optical power ratio of the first processing surface is the sum of the optical power ratios of the plurality of first sub-processing surfaces.

[0013] In one alternative embodiment, the first processing surface includes a plurality of first sub-processing surfaces, and the optical power ratio of the first processing surface is the sum of the optical power ratios of the plurality of first sub-processing surfaces; the first lens includes a plurality of first sub-lenses, and the plurality of first sub-processing surfaces are disposed on the plurality of first sub-lenses.

[0014] In one alternative approach, the second processing surface includes multiple second sub-processing surfaces, and the optical power ratio of the second processing surface is the sum of the optical power ratios of the multiple second sub-processing surfaces.

[0015] In one alternative embodiment, the second processing surface includes a plurality of second sub-processing surfaces, the optical power ratio of the second processing surface being the sum of the optical power ratios of the plurality of second sub-processing surfaces; the second lens includes a plurality of second sub-lenses, and the plurality of second sub-processing surfaces are disposed on the plurality of second sub-lenses.

[0016] In one alternative approach, the first processing surface is arc-shaped along both the first and second directions, and the radius of curvature of the first processing surface along the first direction is greater than its radius of curvature along the second direction. The first processing surface is also used to adjust the size of the light spot formed by the beam in the first direction.

[0017] In one alternative embodiment, a third processing surface is provided on the first lens, the third processing surface being arc-shaped along the first direction, the third processing surface being used to adjust the size of the light spot formed by the beam in the first direction.

[0018] According to another aspect of the embodiments of this application, a laser emitting device is provided, including a light source whose outer contour of the light-emitting area is striped along a first direction and a beam collimation component as described above, wherein the path of the beam emitted by the light source forms an optical path, and in the optical path, a first processing surface is located between the light source and a second processing surface.

[0019] In one alternative embodiment, the laser emitting device further includes a reflective component disposed in the optical path, which is used to reflect the received light beam to adjust the direction of the optical path.

[0020] In one alternative embodiment, the lens includes a first lens, a third lens, and a second lens arranged sequentially along the direction of beam propagation in the optical path; the first processing surface includes a third sub-processing surface and a fourth sub-processing surface, the third sub-processing surface being disposed on the first lens and the fourth sub-processing surface being disposed on the third lens, the third sub-processing surface being used to compress the divergence angle of the beam emitted by the light source in a second direction, and the fourth sub-processing surface being used to further compress the divergence angle of the beam passing through the third sub-processing surface in the second direction; the third lens is also provided with a fourth processing surface, the fourth processing surface being arc-shaped along the first direction, the fourth processing surface being used to adjust the size of the light spot formed by the beam in the first direction; the second processing surface is disposed on the second lens, and the second processing surface is also used to collimate the beam passing through the fourth sub-processing surface in the second direction.

[0021] In one alternative embodiment, the laser emitting device further includes a diffusion component, wherein the beam collimation component is located between the light source and the diffusion component in the optical path, and the diffusion component is used to diffuse the beam that has passed through the beam collimation component.

[0022] The beam collimation component provided in this application uses a combination of a first processing surface (cylindrical mirror type) that is curved along the second direction and a second processing surface (circular mirror type) that is a rotationally symmetric curved surface to collimate the light source whose outer contour along the first direction is strip-shaped. This compresses the divergence angle of the light beam emitted by the light source in the second direction when it passes through the first processing surface, and then collimates it in the second direction when it passes through the second processing surface. Although the light beam emitted by the light source will form an optical path difference in the first direction when it passes through the first processing surface, the second processing surface will compensate for the optical path difference formed in the first direction when it passes through the first processing surface, thus reducing the optical path difference. This avoids the large optical path difference in the first direction affecting the collimation effect of the light beam in the second direction, ensuring that the divergence angle of the final emitted light beam in the second direction is small and has a good collimation effect. Furthermore, the optical power of the first processing surface and the second processing surface can be flexibly allocated, making it applicable to a wide range of scenarios.

[0023] The above description is only an overview of the technical solution of this application. In order to better understand the technical means of this application and to implement it in accordance with the contents of the specification, and to make the above and other objects, features and advantages of this application more obvious and understandable, the following are specific embodiments of this application. Attached Figure Description

[0024] Various other advantages and benefits will become apparent to those skilled in the art upon reading the following detailed description of preferred embodiments. The accompanying drawings are for illustrative purposes only and are not intended to limit the scope of this application. Furthermore, the same reference numerals denote the same parts throughout the drawings. In the drawings:

[0025] Figure 1 A schematic diagram of the optical path along the fast axis of the structure for collimating a light source with a strip-shaped outer contour of the luminescent area using a single cylindrical lens, as provided in an embodiment of the present invention.

[0026] Figure 2 A schematic diagram of the optical path along the slow axis of the structure provided in this embodiment of the invention for collimating a light source with a strip-shaped outer contour of the luminescent region using a single cylindrical lens;

[0027] Figure 3 A schematic diagram of the structure of an Osram 905nm edge-emitting laser, model SPL_BB90-06-8-03B, provided in an embodiment of the present invention;

[0028] Figure 4 The angular spatial energy distribution curve is formed by collimating a light source with a strip-shaped outer contour of the luminous area in the fast axis direction using a single cylindrical lens, as provided in an embodiment of the present invention.

[0029] Figure 5 A schematic diagram of the optical path along the fast axis of the structure for collimating a light source with a strip-shaped outer contour of the luminescent area using a double-cylinder lens, as provided in an embodiment of the present invention.

[0030] Figure 6 A schematic diagram of the optical path along the slow axis of the structure provided in this embodiment of the invention for collimating a light source with a strip-shaped outer contour of the luminescent area using a double-cylinder lens;

[0031] Figure 7 The angular spatial energy distribution curve is formed by collimating a light source with a strip-shaped outer contour of the luminous area in the fast axis direction using a double cylindrical lens provided in an embodiment of the present invention.

[0032] Figure 8 A schematic diagram of the optical path along the fast axis of the structure for collimating a light source with a strip-shaped outer contour of the light-emitting area using a single circular mirror, as provided in an embodiment of the present invention.

[0033] Figure 9A schematic diagram of the optical path along the slow axis of the structure provided in this embodiment of the invention for collimating a light source with a strip-shaped outer contour of the light-emitting area using a single circular mirror;

[0034] Figure 10 An angular spatial energy distribution curve formed by collimating a light source with a strip-shaped outer contour of the luminous area using a single circular mirror in the fast axis direction, as provided in an embodiment of the present invention.

[0035] Figure 11 A schematic diagram of the optical path along the fast axis of the structure provided in this embodiment of the invention, which uses a double circular mirror to collimate a light source with a strip-shaped outer contour of the light-emitting area.

[0036] Figure 12 A schematic diagram of the optical path along the slow axis of the structure provided in this embodiment of the invention, which uses a double circular mirror to collimate a light source with a strip-shaped outer contour of the light-emitting area.

[0037] Figure 13 The angular spatial energy distribution curve is formed by collimating a light source with a strip-shaped outer contour of the luminous area using a double circular mirror in the fast axis direction, as provided in the embodiment of the present invention.

[0038] Figure 14 A schematic diagram of the optical path along the fast axis of another structure for collimating a light source with a strip-shaped outer contour of the light-emitting area using a double circular mirror, as provided in an embodiment of the present invention.

[0039] Figure 15 A schematic diagram of the optical path along the slow axis of another structure for collimating a light source with a strip-shaped outer contour of the luminous area using a double circular mirror, as provided in an embodiment of the present invention.

[0040] Figure 16 An angular spatial energy distribution curve is formed by collimating a light source with a strip-shaped outer contour of the luminous area in the fast axis direction using a double circular mirror, as provided in another embodiment of the present invention.

[0041] Figure 17 A schematic diagram of the optical path structure for collimating a beam in the second direction using a beam collimation assembly with an integrated lens, provided in an embodiment of the present invention.

[0042] Figure 18 A schematic diagram of the optical path structure for collimating a beam in a first direction using a beam collimation assembly with an integrated lens, provided in an embodiment of the present invention.

[0043] Figure 19a This is a schematic diagram of a light source with a strip-shaped outer contour of the light-emitting area, provided in an embodiment of the present invention.

[0044] Figure 19b This is a schematic diagram of a light source with a strip-shaped outer contour of the light-emitting area, provided in an embodiment of the present invention.

[0045] Figure 19c This is a schematic diagram of a light source with a strip-shaped outer contour of the light-emitting area, provided in an embodiment of the present invention.

[0046] Figure 19d This is a schematic diagram of a light source with a strip-shaped outer contour of the light-emitting area, provided in an embodiment of the present invention.

[0047] Figure 19e This is a schematic diagram of a light source with a strip-shaped outer contour of the light-emitting area, provided in an embodiment of the present invention.

[0048] Figure 19f This is a schematic diagram of a light source with a strip-shaped outer contour of the light-emitting area, provided in an embodiment of the present invention.

[0049] Figure 20 A schematic diagram of the optical path structure for collimating a beam in the second direction using a beam collimation assembly with a split lens, provided in an embodiment of the present invention.

[0050] Figure 21 A schematic diagram of the optical path structure for collimating a beam in a first direction using a beam collimation assembly with a split lens, provided in an embodiment of the present invention.

[0051] Figure 22 The beam collimation component provided in this embodiment of the invention performs collimation processing on a light source with a strip-shaped outer contour of the emitting region in the fast axis direction, forming an angular spatial energy distribution curve. The first processing surface 120 has an optical power of 40%, and the second processing surface 130 has an optical power of 60%.

[0052] Figure 23 The beam collimation component provided in this embodiment of the invention performs collimation processing on a light source with a strip-shaped outer contour of the emitting region in the fast axis direction, forming an angular spatial energy distribution curve. The first processing surface 120 has an optical power of 80%, and the second processing surface 130 has an optical power of 20%.

[0053] Figure 24 The beam collimation component provided in this embodiment of the invention performs collimation processing on a light source with a strip-shaped outer contour of the emitting region in the fast axis direction, forming an angular spatial energy distribution curve. The first processing surface 120 has an optical power ratio of 91%, and the second processing surface 130 has an optical power ratio of 9%.

[0054] Figure 25a A schematic diagram of the structure in which the optical power ratio of the first processing surface and the second processing surface in the beam collimation component provided in the embodiment of the present invention is both positive;

[0055] Figure 25bA schematic diagram of a beam collimation assembly provided in another embodiment of the present invention, in which the optical power ratios of the first processing surface and the second processing surface are both positive;

[0056] Figure 25c This is a schematic diagram of a beam collimation assembly provided in an embodiment of the present invention, in which the optical power ratio of the first processing surface is negative.

[0057] Figure 26a A schematic diagram of a beam collimation assembly provided in an embodiment of the present invention, wherein there are two first sub-processing surfaces respectively disposed on a first lens and a second lens;

[0058] Figure 26b This is a schematic diagram of the structure of the beam collimation assembly provided in the embodiment of the present invention, which has two first sub-processing surfaces respectively disposed on the incident surface and the exit surface of the first lens;

[0059] Figure 26c A schematic diagram of a beam collimation assembly provided in an embodiment of the present invention, wherein the first sub-processing surface has three surfaces respectively disposed on the incident surface of the first lens, the exit surface of the first lens, and the second lens;

[0060] Figure 27a This is a schematic diagram of the structure of the beam collimation assembly provided in the embodiment of the present invention, in which the incident surface and the exit surface of the first lens are provided with first sub-processing surfaces, one of which performs compression focusing processing on the beam;

[0061] Figure 27b This is a schematic diagram of the structure of the beam collimation assembly provided in the embodiment of the present invention, in which the incident surface and the exit surface of the first lens are provided with first sub-processing surfaces, one of which performs beam diffusion processing on the beam.

[0062] Figure 28a A schematic diagram of a beam collimation assembly provided in an embodiment of the present invention, wherein there are multiple first sub-lenses and multiple first sub-processing surfaces;

[0063] Figure 28b A schematic diagram of a beam collimation assembly provided in an embodiment of the present invention, wherein there are multiple first sub-lenses and multiple first sub-processing surfaces;

[0064] Figure 28c A schematic diagram of a beam collimation assembly provided in an embodiment of the present invention, wherein there are multiple first sub-lenses and multiple first sub-processing surfaces;

[0065] Figure 29 This is a schematic diagram of the structure of the beam collimation component provided in the embodiment of the present invention, in which the second processing surface includes multiple second sub-processing surfaces;

[0066] Figure 30This is a schematic diagram of the structure of the beam collimation assembly provided in the embodiment of the present invention, in which there are multiple second sub-lenses and multiple second sub-processing surfaces;

[0067] Figure 31a A schematic diagram of the beam collimation assembly provided in the embodiments of the invention in the second direction;

[0068] Figure 31b A schematic diagram of the beam collimation assembly provided in the embodiments of the invention in the first direction;

[0069] Figure 32a A schematic diagram of the beam collimation assembly provided in the embodiments of the invention in the second direction;

[0070] Figure 32b A schematic diagram of the beam collimation assembly provided in the embodiments of the invention in the first direction;

[0071] Figure 33a A schematic diagram of the structure of the laser emitting device provided in the embodiment of the invention, in which the beam collimation component adopts an integrated lens in the second direction;

[0072] Figure 33b A schematic diagram of the structure of the laser emitting device provided in the embodiment of the invention, in which the beam collimation component adopts an integrated lens in the first direction;

[0073] Figure 34a A schematic diagram of the structure of the laser emitting device provided in the embodiment of the invention, in which the beam collimation component adopts a split lens in the second direction;

[0074] Figure 34b A schematic diagram of the structure of the laser emitting device provided in the embodiment of the invention, in which the beam collimation component adopts a split lens in the first direction;

[0075] Figure 35a A schematic diagram of the structure of a laser emitting device with a reflective component provided in an embodiment of the invention in the second direction;

[0076] Figure 35b A schematic diagram of a laser emitting device with a reflective component provided in an embodiment of the invention in a first direction;

[0077] Figure 36a A schematic diagram of the structure of the laser emitting device in the second direction provided in the embodiment of the invention;

[0078] Figure 36b A schematic diagram of the structure of a laser emitting device in a first direction, provided for an embodiment of the invention;

[0079] Figure 37a A schematic diagram of the structure of the laser emitting device in the second direction provided in the embodiment of the invention;

[0080] Figure 37b A schematic diagram of the structure of a laser emitting device in a first direction, provided for an embodiment of the invention;

[0081] Figure 38a A schematic diagram of the structure of a laser emitting device with a reflective component provided in an embodiment of the invention in the second direction;

[0082] Figure 38b A schematic diagram of a laser emitting device with a reflective component provided in an embodiment of the invention in a first direction;

[0083] Figure 39 A schematic diagram of the structure of a laser emitting device with a diffusion component provided in an embodiment of the invention in a second direction;

[0084] Figure 40 A schematic diagram of a laser emitting device with a reflection component and a diffusion component provided in another embodiment of the present invention in the second direction.

[0085] The reference numerals in the detailed embodiments are as follows:

[0086] 1. First light source; 2. Cylinder lens; 21. First cylinder lens; 22. Second cylinder lens; 3. Circular lens; 31. First circular lens; 32. Second circular lens;

[0087] 100. Beam collimation assembly; 110. Lens; 111. First lens; 1111. First sub-lens; 112. Second lens; 1121. Second sub-lens; 113. Third lens; 120. First processing surface; 121. First sub-processing surface; 122. Third sub-processing surface; 123. Fourth sub-processing surface; 130. Second processing surface; 131. Second sub-processing surface; 140. Third processing surface; 150. Fourth processing surface;

[0088] 200. Light source; 210. Position of light emission;

[0089] 1000, Laser emitting device; 300, Reflection component; 400, Diffusion component. Detailed Implementation

[0090] The embodiments of the technical solution of this application will now be described in detail with reference to the accompanying drawings. These embodiments are only used to more clearly illustrate the technical solution of this application and are therefore merely examples, and should not be used to limit the scope of protection of this application.

[0091] 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 pertains; the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the application; the terms “comprising” and “having”, and any variations thereof, in the specification, claims, and foregoing description of the drawings are intended to cover non-exclusive inclusion.

[0092] In the description of the embodiments of this application, technical terms such as "first" and "second" are used only to distinguish different objects and should not be construed as indicating or implying relative importance or implicitly specifying the number, specific order, or primary and secondary relationship of the indicated technical features. In the description of the embodiments of this application, "multiple" means two or more, unless otherwise explicitly defined.

[0093] In this document, the term "embodiment" means that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of this phrase in various places throughout the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. It will be explicitly and implicitly understood by those skilled in the art that the embodiments described herein can be combined with other embodiments.

[0094] In the description of the embodiments in this application, the term "and / or" is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent three cases: A exists, A and B exist simultaneously, and B exists. In addition, the character " / " in this document generally indicates that the related objects before and after it have an "or" relationship.

[0095] In the description of the embodiments of this application, the term "multiple" refers to two or more (including two), similarly, "multiple sets" refers to two or more (including two sets), and "multiple pieces" refers to two or more (including two pieces).

[0096] In the description of the embodiments of this application, the technical terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of this application and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.

[0097] In the description of the embodiments of this application, unless otherwise expressly specified and limited, technical terms such as "installation," "connection," "joining," and "fixing" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. For those skilled in the art, the specific meaning of the above terms in the embodiments of this application can be understood according to the specific circumstances.

[0098] For lidar applications in long-range detection, the system efficiency is extremely low, meaning the proportion of light energy received by the receiver from the transmitter is very low, often less than 0.1%. Therefore, high requirements are placed on the laser energy of the transmitter. For the semiconductor lasers currently used in most solutions, the energy of a single-tube laser is far from sufficient; array lasers are generally required, with bar array lasers being a common form.

[0099] Bar array lasers consist of multiple light sources arranged linearly with strip-shaped emitting regions, also known as multi-channel lasers. Generally, in high-performance applications such as automotive LiDAR, diffraction-limited collimation is required, placing extremely high demands on optical design. For bar array lasers, high collimation is typically required in the fast axis direction (i.e., the direction perpendicular to the arrangement of the multiple light sources in the bar array). This is relatively easy to collimate a single point light source, but when collimating one or more light sources with strip-shaped emitting regions, it is difficult to ensure that the light emitted by each source achieves high collimation.

[0100] It should be noted that the outer contour of the light-emitting area is strip-shaped, which means that the light source is a strip-shaped line light source, a surface light source, or is composed of multiple array light sources, and the edges of the outermost light sources are connected to form a strip shape.

[0101] First, the essence of collimation is to eliminate aberrations and reduce the optical path difference between different apertures and fields of view. The optical path difference refers to the difference in the optical path traveled by different rays from the emitting region to the detector surface. In air, the optical path equals the actual distance traveled (i.e., the refractive index of air is considered 1), while in glass, the optical path equals the product of the actual distance traveled and the refractive index. For a fast-axis collimated system, not only is a small optical path difference along the fast axis required, but also a small optical path difference between different paths along the slow axis. In other words, a large optical path difference along the slow axis will affect the collimation of the fast axis.

[0102] To collimate the light emitted from a light source with a strip-shaped outer contour in the fast axis direction, a single cylindrical lens can be used for collimation, as shown in the example below. Figure 1 and Figure 2As shown, Figure 1 The middle view is along the fast axis (the direction shown by the z-axis in the figure). Figure 2 This is a view along the slow axis (the direction shown by the y-axis in the figure), where cylindrical lens 2 has a curved surface along the fast axis but no surface along the slow axis, as shown below. Figure 1 As shown, taking three light sources as an example, in the fast axis direction, the cylindrical lens 2 can perform the same collimation process on the light emitted by each first light source 1 in the fast axis direction. The optical path length δδ of light ray a is... a =(L OA1 ×1)+(L A1A2 ×n)+(L A2A3 ×1), where L OA1 Let represent the length between point O and A1, and so on. Let 1 be the refractive index of vacuum or air, and n be the refractive index of the cylindrical lens. The optical path length δ of ray b is... b =(L OB1 ×1)+(L B1B2 ×n)+(L B2B3 ×1). By Figure 1 As can be seen from this, although L OA1 >L OB1 L A2A3 >L B2B3 However, L A1A2 <L B1B2 Therefore δ a With δ b The difference is small, that is, the optical path difference between the light emitted by each first light source 1 in the fast axis direction is small, so it can achieve a better collimation effect in the fast axis direction.

[0103] However, as Figure 2 As shown, in the slow axis direction, there is a large optical path difference between the light rays emitted by the same first light source 1 in the cylindrical lens 2. Specifically, as... Figure 2 As shown, the optical path δ of the light ray c emitted by the first light source 1 at the top is... c =(L OC1 ×1)+(L C1C2 ×n)+(L C2C3 ×1), the optical path δ of the light d emitted by the first light source 1 d =(L OD1 ×1)+(L D1D2 ×n)+(L D2D3 ×1), as shown in the figure, L OC1 >L OD1 L C1C2 >L D1D2 L C2C3 >L D2D3 Therefore δ c With δ dWhen the difference is large, and the optical path difference between different rays emitted by the same first light source 1 is large in the slow axis direction, it will have an adverse effect on the collimation effect in the fast axis direction.

[0104] Using an Osram 905nm edge-emitting laser, 8-channel bar model SPL_BB90-06-8-03B (see details) Figure 3 Taking a single cylindrical lens as an example, after collimation along the fast axis, the resulting angular spatial energy distribution is as follows: Figure 4 As shown in the figure, the horizontal axis represents the angle of light rays, and the vertical axis represents the light intensity. According to (1 / e 2 The standard calculation of its divergence angle is (1 / e) 2 Multiplying the value by the peak light intensity yields the ordinate value, which is then taken as the ordinate value. Figure 4 The absolute value of the difference between the horizontal coordinates at both ends of the distribution curve on the vertical axis is taken as the divergence angle, where e is the natural constant, and the value of e is taken as 2.718. Through the above calculation method, it is found that after the single cylindrical lens collimates the 8-channel bar in the fast axis direction, the divergence angle on the fast axis is approximately 0.075°.

[0105] Alternatively, a double-cylinder lens can be used to collimate the light emitted by the first light source 1, whose outer contour is strip-shaped, along the fast axis. For details, please refer to [link to relevant documentation]. Figure 5 and Figure 6 , Figure 5 This is a view along the fast axis. Figure 6 For the view in the slow axis direction, the first cylindrical lens 21 and the second cylindrical lens 22 work together to collimate multiple linearly distributed first light sources 1 in the fast axis direction. Similar to the single cylindrical lens scheme described above, it will also cause a large optical path difference between different rays emitted by the same first light source 1 in the slow axis direction, thus affecting the collimation effect in the fast axis direction.

[0106] Taking the aforementioned 8-channel bar as an example, after collimation along the fast axis using a double-cylinder lens, the resulting angular spatial energy distribution is as follows: Figure 7 As shown, and based on the above calculation method, after the double cylindrical lens collimates the 8-channel bar in the fast axis direction, the divergence angle on the fast axis is approximately 0.074°.

[0107] Furthermore, a single circular mirror can be used to collimate the light emitted by the first light source 1, whose outer contour is strip-shaped, in the fast axis direction. For details, please refer to [link to relevant documentation]. Figure 8 and Figure 9 , Figure 8 This is a view along the fast axis. Figure 9 This is a view along the slow axis, where the circular mirror 3 has a curved surface in both the fast and slow axis directions. Figure 9As shown in the slow axis direction, for the first light source 1 at the edge, such as the topmost first light source 1, there is a large optical path difference between the emitted rays, which in turn affects the collimation effect in the fast axis direction. Figure 1 , Figure 2 The single-cylinder lens scheme shown is similar to Figure 8 , Figure 9 As can be seen from the comparison of the single circular mirror schemes shown, due to the surface characteristics of the circular mirror, when using a circular mirror for collimation, it is necessary to design a larger size in both the fast and slow axis directions, which is not conducive to reducing the size of the product.

[0108] Taking the aforementioned 8-channel bar as an example, after collimation using a single circular mirror, the resulting angular spatial energy distribution is as follows: Figure 10 As shown, and based on the above calculation method, after the single circular mirror aligns the 8-channel bar in the fast axis direction, the divergence angle on the fast axis is approximately 0.074°.

[0109] Alternatively, the light emitted by the first light source 1, whose outer contour is strip-shaped, can be collimated along the fast axis using a double circular mirror method. For details, please refer to [link to relevant documentation]. Figure 11 and Figure 12 , Figure 11 This is a view along the fast axis. Figure 12 This is a view along the slow axis. The first circular mirror 31 has two surfaces with equal radii of curvature, therefore its optical power ratio is 0, and it functions as a beam expander. The second circular mirror 32 has an optical power ratio of 100%, functioning as a collimator. Similarly, taking the aforementioned 8-channel bar as an example, after collimation using two circular mirrors with an optical power ratio of 0+100%, the resulting angular spatial energy distribution is as follows: Figure 13 As shown, according to the above calculation method, after collimating the 8-channel bar strips of the double circular mirror with an optical power ratio of 0+100% in the fast axis direction, the divergence angle on the fast axis is approximately 0.04°.

[0110] Furthermore, another type of double circular mirror can be used to collimate the light emitted by the first light source 1, whose outer contour of the light-emitting area is strip-shaped, in the fast axis direction. For details, please refer to [link to relevant documentation]. Figure 14 and Figure 15 , Figure 14 This is a view along the fast axis. Figure 15This is a view along the slow axis, where the first circular mirror 31 and the second circular mirror 32 are both curved surfaces in both the fast and slow axis directions. The optical power of the first circular mirror 31 and the second circular mirror 32 is allocated 50% each. That is, when the divergence angle of the beam emitted by the first light source 1 is 30°, the first circular mirror 31 adjusts the divergence angle to 15°, and the second circular mirror 32 adjusts the divergence angle to near 0. Similarly, taking the aforementioned 8-channel bar as an example, after collimation using two circular mirrors with a 50% optical power allocation, the resulting angular spatial energy distribution is as follows: Figure 16 As shown, according to the above calculation method, after collimating the 8-channel bar strips of the double circular mirror with an optical power ratio of 50% each in the fast axis direction, the divergence angle on the fast axis is approximately 0.13°.

[0111] Therefore, it can be seen that for the scheme using two circular mirrors, when the first circular mirror is not assigned optical power, a smaller divergence angle can be obtained. When the first circular mirror is assigned optical power, the divergence angle will increase, resulting in poor collimation.

[0112] Therefore, in the collimation scheme using two circular mirrors, the first circular mirror can only expand the beam and cannot flexibly allocate optical power, making it unsuitable for applications requiring flexible allocation of lens optical power. For example, when it is necessary to reduce the sensitivity / optical power of one lens and transfer all sensitivity / optical power to other lenses, the all-circular mirror scheme is no longer applicable.

[0113] Based on the above problems, this application adopts a scheme of cylindrical and circular mirrors to collimate the light source whose outer contour of the light-emitting area is strip-shaped along the first direction (e.g., the slow axis direction). The cylindrical mirror is an arc-shaped surface along the second direction (e.g., the fast axis direction). The cylindrical mirror can compress the divergence angle of the light beam emitted from the light-emitting area along the second direction. The optical path difference formed in the first direction after the light beam passes through the cylindrical mirror can be compensated by the circular mirror, ultimately ensuring that the light beam does not form a large optical path difference in the first direction, thus not having a significant impact on the collimation effect in the second direction, and ensuring that the light beam is effectively collimated in the second direction.

[0114] According to one aspect of an embodiment of this application, a beam collimation component is provided, as detailed below. Figure 17 and Figure 18 , Figure 17 The diagram illustrates the structure and optical path of a beam collimation component provided in one embodiment of this application in the second direction (the direction shown by the z-axis in the figure, i.e., the fast axis direction). Figure 18The diagram illustrates the structure and optical path of a beam collimation assembly in the first direction (the direction shown by the y-axis in the diagram, i.e., the slow axis direction), with the dashed line representing the beam. As shown, the beam collimation assembly 100 is used to collimate a light source 200 whose outer contour along the first direction (the direction shown by the y-axis in the diagram, i.e., the slow axis direction) forms a strip. The beam collimation assembly 100 includes a lens 110, which has a first processing surface 120 and a second processing surface 130. The first processing surface 120 is arc-shaped along the second direction and is used to compress the divergence angle of the beam emitted by the light source 200 in the second direction, wherein the second direction is perpendicular to the first direction. The second processing surface 130 is a rotationally symmetric surface and is used to collimate the beam passing through the first processing surface 120 and compensate for at least a portion of the optical path difference formed by the beam passing through the first processing surface 120.

[0115] Please see Figures 19a to 19e As shown in the figure, the light source with a strip-shaped outer contour of the luminous area can be... Figure 19a The image shown consists of a single row of point light sources arranged at linear intervals, and can be as follows: Figure 19b The image shown consists of multiple rows of point light sources arranged at linear intervals, and can be as follows: Figure 19c The image shown consists of a single row of point light sources arranged linearly adjacent to each other, and can be as follows: Figure 19d The diagram shows multiple rows of point light sources arranged linearly adjacent to each other, and these rows of point light sources are also arranged adjacent to each other. Alternatively, it could be as follows: Figure 19e The diagram shows a group of light-emitting units formed by single-row point light sources arranged linearly adjacent to each other, and multiple groups of light-emitting units arranged at linear intervals to form an overall light-emitting area. Alternatively, it could be as follows: Figure 19f The diagram shows a group of light-emitting units formed by multiple rows of point light sources arranged linearly adjacent to each other, and multiple groups of light-emitting units arranged at linear intervals to form an overall light-emitting area. It should be noted that the light source 200 shown in the above figure are only a few implementation methods and are not intended to limit the implementation of the light source 200.

[0116] Specifically, such as Figure 17 and Figure 18 As shown, in some embodiments, the first processing surface 120 and the second processing surface 130 are respectively disposed on the incident surface and the exit surface of the lens 110.

[0117] like Figure 17As shown, in the second direction, i.e., the fast axis direction, the light beam emitted by the light source 200 is refracted when it reaches the first processing surface 120, and the divergence angle is compressed and reduced. Then, the light beam is refracted again when it reaches the second processing surface 130 after passing through the lens 110, and the divergence angle is further compressed to form collimation. It can be understood that collimation processing refers to the theoretical goal of achieving all light rays being perfectly parallel to the optical axis. However, in reality, due to manufacturing errors of the lens 110, the final emitted light beam will inevitably still have a small divergence angle. Therefore, the collimation processing mentioned in this application is not limited to the assumption that all emitted light rays are perfectly parallel to the optical axis.

[0118] Regarding the compensation of the optical path difference formed by the beam passing through the first processing surface 120 by the second processing surface 130, please refer to [link / reference]. Figure 18 As shown in the figure, in the slow axis direction (the direction shown by the y-axis in the figure), the paths L of the light rays e and f emitted from the top of the light source 200 at the first processing surface 120 are... E1E2 >L F1F2 Therefore, light rays e and f will form an optical path difference after passing through the first processing surface 120 on the slow axis, while the paths L of light rays e and f at the second processing surface 130 will be different. E3E4 <L F3F4 Therefore, when light rays e and f pass through the second processing surface 130, they can compensate for at least part of the optical path difference formed when passing through the first processing surface 120, thereby reducing the optical path difference between them in the entire optical path and achieving a good collimation effect. The same applies to the light ray g emitted from the top of the light source 200. G1G2 >L F1F2 And L G3G4 <L F3F4 This can reduce the optical path difference between light rays g and f throughout the optical path, achieving a good collimation effect.

[0119] In addition, please see Figure 20 and Figure 21 In some other embodiments, the lens 110 includes a first lens 111 and a second lens 112, with a first processing surface 120 disposed on the first lens 111 and a second processing surface 130 disposed on the second lens 112.

[0120] like Figure 21 As shown, the first lens 111 and the second lens 112 are also separate, L H1H2 >L I1I2 And L H3H4 <L I3I4 L J1J2 >L I1I2 And L J3J4 <L I3I4 This allows for compensation of the optical path difference, resulting in a good collimation effect.

[0121] Taking the aforementioned 8-channel bar as an example, after collimation processing by the first processing surface 120 and the second processing surface 130, the resulting angular spatial energy distribution is as follows: Figures 22 to 24 As shown, where, Figure 22 The first processing surface has a power ratio of 120 and a power ratio of 40%, while the second processing surface has a power ratio of 130 and a power ratio of 60%. Figure 23 The first processing surface has a power of 120, accounting for 80% of the optical power, and the second processing surface has a power of 130, accounting for 20% of the optical power. Figure 24 The first processing surface has a power ratio of 120° and a power ratio of 91%, while the second processing surface has a power ratio of 130° and a power ratio of 9%. The divergence angle is calculated according to the (1 / e²) standard. Figure 22 The corresponding divergence angle on the fast axis is 0.0415°. Figure 23 The corresponding divergence angle on the fast axis is 0.04°. Figure 24 The corresponding divergence angle on the fast axis is 0.039°. It can be seen that when the first processing surface 120 (cylindrical mirror type) and the second processing surface 130 (circular mirror type) are combined, the optical power of the first processing surface 120 and the second processing surface 130 can be flexibly allocated, and both can achieve a small divergence angle, thus achieving a good collimation effect.

[0122] In the beam collimation component 100 provided in this application embodiment, the light source 200, whose outer contour is strip-shaped along the first direction, is collimated by combining a first processing surface 120 (cylindrical mirror type) that is arc-shaped along the second direction and a second processing surface 130 (circular mirror type) that is a rotationally symmetrical curved surface. This collimates the light beam emitted by the light source 200 in the second direction by combining the first processing surface 120 and the second processing surface 130. Although the light beam emitted by the light source 200 will form an optical path difference in the first direction when passing through the first processing surface 120, the second processing surface 130 will compensate for the optical path difference formed in the first direction when passing through the first processing surface 120, thereby reducing the optical path difference. This avoids the large optical path difference in the first direction affecting the collimation effect of the light beam in the second direction, ensuring that the final emitted light beam has a small divergence angle in the second direction and has a good collimation effect. Furthermore, the optical power of the first processing surface 120 and the second processing surface 130 can be flexibly allocated, making it applicable to a wide range of scenarios.

[0123] Please see Figure 18 and Figure 21As shown in the figure, in order to ensure a good collimation effect, in some embodiments, the beam collimation component 100 is used to collimate the light source 200 which includes a plurality of light emission positions 210 distributed along a first direction. The second processing surface 130 is configured such that, along the second direction (the direction shown by the y-axis in the figure, i.e. the slow axis direction), the light rays with the largest angle between the light beam emitted by each light emission position 210 of the light source 200 and the light rays that are biased to both sides are respectively incident on both sides of the central axis of the second processing surface 130.

[0124] Wherein, the light-emitting position 210 can be as follows: Figure 18 and Figure 21 The point light source shown can also be a part of a line light source or a surface light source.

[0125] Specifically, such as Figure 21 As shown, the central axis of the second processing surface 130 coincides with the horizontal light emitted from the middle light-emitting position 210. In the light beam emitted from the uppermost light-emitting position 210, the rays with the largest angle between their optical axis (which coincides with ray i) and those deviating to the sides are rays h and j, respectively. When rays h and j reach the second processing surface 130, they are located above and below the central axis of the second processing surface 130 (i.e., the horizontal light emitted from the middle light-emitting position 210), respectively. Figure 18 The same applies to the integrated lens embodiment shown, and will not be elaborated further here.

[0126] according to Figure 21 It can be seen that in the second direction (the direction shown by the y-axis in the figure, i.e., the slow axis direction), the paths of light rays h and j at the first processing surface 120 (i.e., in the first lens 111) are equal, and both are greater than the path of light ray i in the first lens 111, i.e., L H1H2 =L J1J2 >L I1I2 And in the path of the second processing surface 130 (that is, in the second lens 112), there is L H3H4 <L J3J4 <L I3I4 Therefore, at least part of L can be compensated. I1I2 With L H1H2 and L J1J2 The difference formed at the first processing surface 120° between them compensates for the optical path difference. Figure 18 The same principle applies to the integrated lens embodiment shown, and will not be elaborated further here.

[0127] by Figure 21 For example, if both light rays h and j are located above the central axis of the second processing surface 130 (i.e., the horizontal light emitted from the central light-emitting position 210), it will cause L J3J4 >L I3I4>L H3H4 Therefore, it will further increase the optical path difference between light ray j and light ray i, resulting in a large optical path difference in the beam in the second direction, which in turn will affect the collimation effect of the beam in the first direction.

[0128] In some embodiments of this application, the optical power ratio of the first processing surface 120 is any value from 40% to 120%, and the optical power ratio of the second processing surface 130 is any value from -20% to 60%. The optical power ratio of the second processing surface is not 0, and the sum of the optical power ratios of the first processing surface 120 and the second processing surface 130 is 100%.

[0129] Specifically, please refer to Figure 25a and Figure 25b The figure shows two implementation methods when the optical power ratio of the first processing surface 120 and the second processing surface 130 are both positive. For example... Figure 25a As shown, the first processing surface 120 can compress and reduce the divergence angle of the beam, but after passing through the first processing surface 120, the beam still reaches the second processing surface 130 in a diffused state, where the second processing surface 130 further compresses and reduces the divergence angle to form a collimated state. Figure 25b As shown, after the first processing surface 120 compresses the divergence angle of the light beam, the light beam first focuses towards the focal point of the first processing surface 120 after passing through the focal point, and then reaches the second processing surface 130, where the divergence angle is further compressed and reduced to form a collimated state.

[0130] Please see Figure 25c The figure shows an implementation when the optical power ratio of the second processing surface 130 is negative. As shown in the figure, the first processing surface 120 compresses and reduces the divergence angle of the light beam, and the light beam is focused after passing through the first processing surface 120. The second processing surface 130 needs to be set before the focal position of the first processing surface 120, so that the light beam passing through the first processing surface 120 will be diffused by the second processing surface 130 before reaching the focal position of the first processing surface 120, so that the light beam passing through the second processing surface 130 forms a collimated state.

[0131] Experimental research has shown that when the optical power ratio of the first processing surface 120 is any value within the range of 40% to 120%, and the optical power ratio of the second processing surface 130 is any value within the range of -20% to 60%, the divergence angle of the light beam emitted by the light source 200 in the second direction (i.e., the fast axis direction) can be kept small, thus achieving a better collimation effect in the fast axis direction.

[0132] Furthermore, in some embodiments, the optical power ratio of the first processing surface 120 is any value within the range of greater than 70% and less than 100%, and the optical power ratio of the second processing surface 130 is any value within the range of greater than 0 and less than or equal to 30%.

[0133] Through experimental research, the inventors of this application discovered that when the optical power ratio of the first processing surface 120 is set to any value within the range of greater than 70% and less than 100%, and the optical power ratio of the second processing surface 130 is set to any value within the range of greater than 0 and less than or equal to 30%, a smaller divergence angle can be obtained after collimating the light beam emitted by the light source 200, that is, a better collimation effect can be achieved.

[0134] Furthermore, the optimal collimation effect is achieved when the optical power ratio of the first processing surface 120 is 91% and that of the second processing surface 130 is 9%, as detailed below. Figure 24 As shown, the divergence angle can reach 0.039°.

[0135] Please see Figures 26a to 26c The figure shows the structure of the beam collimation component provided in several embodiments of this application. As shown in the figure, in some embodiments, the first processing surface 120 includes a plurality of first sub-processing surfaces 121, and the optical power ratio of the first processing surface 120 is the sum of the optical power ratios of the plurality of first sub-processing surfaces 121.

[0136] Specifically, such as Figure 26a As shown, there can be two first sub-processing surfaces 121, which are respectively disposed on the first lens 111 and the second lens 112. Figure 26b As shown, there can be two first sub-processing surfaces 121, which are respectively disposed on the incident surface and the exit surface of the first lens 111. Figure 26c As shown, there can also be three first sub-processing surfaces 121, which are respectively disposed on the incident surface of the first lens, the exit surface of the first lens, and the second lens 112.

[0137] In an embodiment where both the incident and exit surfaces of the first lens 111 are provided with the first sub-processing surface 121, a structure can be formed as follows: Figure 27a The optical path shown in the diagram involves the first sub-processing surface 121 on the left compressing the divergence angle of the beam to form a collimated shape, followed by the first sub-processing surface 121 on the right further compressing the collimated beam to form a focused state. After passing the focal point, the beam diverges and enters the second lens 112, and finally, the second processing surface 130 performs collimation processing to output a collimated beam. In other embodiments, a similar optical path can also be formed. Figure 27bThe optical path shown in the diagram compresses the divergence angle of the beam into a collimated shape by the first sub-processing surface on the left, then diffuses the collimated beam by the first sub-processing surface 121 on the right, increasing its divergence angle, and finally collimates the beam by the second processing surface 130.

[0138] Please see Figures 28a to 28c The figure illustrates the structure of a beam collimation assembly provided in several embodiments of this application. As shown in the figure, in some embodiments, the first processing surface 120 includes a plurality of first sub-processing surfaces 121, and the optical power ratio of the first processing surface 120 is the sum of the optical power ratios of the plurality of first sub-processing surfaces 121. The first lens 111 includes a plurality of first sub-lenses 1111, and the plurality of first sub-processing surfaces 121 are disposed on the plurality of first sub-lenses 1111.

[0139] It should be noted that, Figures 28a to 28c Taking the example that there are two first sub-lenses 1111 and two first sub-processing surfaces 121, this does not constitute a limitation on the specific number of first sub-lenses 1111 and first sub-processing surfaces 121. In other embodiments, the number of first sub-lenses 1111 may be greater than two, and the number of first sub-processing surfaces 121 may also be different from the number of first sub-lenses 1111. For example, at least some of the first sub-lenses 1111 may have first sub-processing surfaces 121 on both sides, or the first sub-lenses 1111 may have first sub-processing surfaces 121 on both sides of the second lens 112.

[0140] Similarly, as Figure 29 As shown, in some embodiments, the second processing surface 130 includes a plurality of second sub-processing surfaces 131, and the optical power ratio of the second processing surface 130 is the sum of the optical power ratios of the plurality of second sub-processing surfaces 131.

[0141] Furthermore, such as Figure 30 As shown, in some embodiments, the second processing surface 130 includes a plurality of second sub-processing surfaces 131, and the optical power ratio of the second processing surface 130 is the sum of the optical power ratios of the plurality of second sub-processing surfaces 131. The second lens 112 includes a plurality of second sub-lenses 1121, and the plurality of second sub-processing surfaces 131 are disposed on the plurality of second sub-lenses 1121.

[0142] It is understood that the above description of the implementation of the first sub-processing surface 121 and the first sub-lens 1111 also applies to the second sub-processing surface 131 and the second sub-lens 1121, so it will not be described in detail here.

[0143] Regarding the first processing surface 120, this application also proposes an implementation method, please refer to [link / reference needed]. Figure 31a and Figure 31bThe figure shows the surface shape of the first processing surface 120 along the second direction (the direction shown by the z-axis in the figure, i.e., the fast axis direction) and along the first direction (the direction shown by the y-axis in the figure, i.e., the slow axis direction). As shown in the figure, the first processing surface 120 is curved along both the first and second directions, and the radius of curvature of the first processing surface 120 along the first direction is greater than its radius of curvature along the second direction. The first processing surface 120 is also used to adjust the size of the light spot formed by the beam in the first direction.

[0144] The radius of curvature is the reciprocal of curvature. Curvature is used to characterize the degree of bending of a curve. The more curved the curve, the greater the curvature, and correspondingly, the smaller the radius of curvature. It can be understood that, taking a convex lens as an example, a larger radius of curvature results in a lower degree of compression of the beam's divergence angle, while a smaller radius of curvature results in a higher degree of compression.

[0145] like Figure 31a As shown, in the second direction (the direction shown by the z-axis in the figure, i.e., the fast axis direction), the radius of curvature of the first processing surface 120 is smaller, thus compressing the beam divergence angle to a greater extent in the second direction. Figure 31b As shown, in the first direction (the direction shown by the y-axis in the figure, i.e. the slow axis direction), the radius of curvature of the first processing surface 120 is relatively large. Therefore, the divergence angle of the beam is compressed to a lower degree in the second direction. This also avoids the large influence of setting the radius of curvature of the surface of the first processing surface 120 in the first direction on the surface shape of the first processing surface 120 in the second direction. This ensures that the divergence angle of the beam can be effectively compressed in the second direction.

[0146] Please continue reading. Figure 31b As shown in the figure, since the light-emitting area of ​​the light source 200 is strip-shaped along the first direction, when a cylindrical surface is also provided on the first processing surface 120 along the first direction (i.e., the first processing surface 120 is also arc-shaped along the first direction), based on the principle of light refraction, the light beam emitted from the light-emitting position located at the edge of the light source 200 along the first direction can be concentrated toward the optical axis position after being processed by the first processing surface 120 and the second processing surface 130, thereby reducing the size of the light spot finally formed in the first direction and increasing the energy density.

[0147] It should be noted that, Figure 31a and Figure 31b The following explanation uses a split lens (i.e., the first processing surface 120 is disposed on the first lens 111 and the second processing surface 130 is disposed on the second lens 112) as an example. The same principle applies to an integral lens (i.e., the first processing surface 120 and the second processing surface are respectively disposed on the incident surface and the processing surface of the lens 110), which will not be elaborated here.

[0148] Regarding adjusting the size of the light spot in the first direction, this application also proposes an implementation method for a split lens; please refer to [link / reference needed]. Figure 32a and 32b The figures show the structure of the beam collimation assembly provided in this application along the second direction and the first direction, respectively. As shown in the figure, a third processing surface 140 is provided on the first lens 111. The third processing surface 140 is arc-shaped along the first direction (the direction shown by the y-axis in the figure, i.e., the slow axis direction). The third processing surface 140 is used to adjust the size of the light spot formed by the beam in the first direction.

[0149] Figure 32a and 32b The embodiment shown uses the same principle as the one that adjusts the spot size of the beam in the first direction. Figure 31a and 31b The adjustment principle of the illustrated embodiments is the same, the difference being that... Figure 32a and 32b In the illustrated embodiment, a cylindrical surface (i.e., the third processing surface 140) that is curved along the first direction is disposed on the surface of the first lens 111 opposite to the first processing surface 120. Figure 31a and Figure 31b In the embodiment shown, a cylindrical surface profile that is curved along the second direction (i.e., the first processing surface 120) and a cylindrical surface profile that is curved along the first direction are integrated on the same surface of the lens.

[0150] According to another aspect of the embodiments of this application, a laser emitting device is also provided, please refer to [link to relevant documentation] for details. Figure 33a and Figure 33b The figure shows the structure of a laser emitting device. As shown in the figure, the laser emitting device 1000 includes a light source 200 whose outer contour of the light-emitting area is strip-shaped along a first direction (the direction shown by the y-axis in the figure, i.e., the slow axis direction) and a beam collimation component 100 in any of the above embodiments. The path of the beam emitted by the light source 200 forms an optical path. In the optical path, a first processing surface 120 is located between the light source 200 and a second processing surface 130.

[0151] Figure 33a and Figure 33b The image shows the beam collimation assembly 100 with an integrated lens structure. For structures using separate lenses, please refer to [link to relevant documentation]. Figure 34a and Figure 34b The figures show the structures along the second direction and along the first direction when using split lenses, respectively.

[0152] The laser emitting device 1000 provided in this application uses the beam collimation component 100 provided in any of the above embodiments to collimate the light source 200 whose outer contour of the emitting area is strip-shaped along the first direction. This can ensure that the divergence angle of the final emitted beam in the second direction is small, and it has a good collimation effect. Furthermore, the optical power of the first processing surface 120 and the second processing surface 130 can be flexibly allocated, making it applicable to a wide range of scenarios.

[0153] Further, please refer to Figure 35a and Figure 35b As shown in the figure, in some embodiments, the laser emitting device 1000 further includes a reflective component 300, which is disposed on the optical path and is used to reflect the received light beam to adjust the direction of the optical path.

[0154] For solutions employing integrated lenses and separate lenses, the reflective assembly 300 can be as follows: Figure 35a The reflective element 300 is positioned in the optical path after the second processing surface 130, as shown in the diagram. It can also be positioned between the light source 200 and the first processing surface 120. For a scheme using a split lens, the reflective element 300 can also be positioned as follows: Figure 35b The position shown is located in the optical path between the first processing surface 120 and the second processing surface 130.

[0155] By setting a reflective component 300 in the optical path, the direction of the optical path can be changed, thereby avoiding the large size of the laser emitting device 1000 in the beam emission direction (i.e., the direction perpendicular to both the y-axis and z-axis) due to the long optical path.

[0156] Please see Figure 36a and 36bThe figures show the structures of the laser emitting device provided in this application in the second direction (the direction shown by the z-axis in the figure, i.e., the fast axis direction) and the first direction (the direction shown by the y-axis in the figure, i.e., the slow axis direction), respectively. As shown in the figures, in some embodiments, the lens 110 includes a first lens 111, a third lens 113, and a fourth lens 113 arranged sequentially along the beam propagation direction in the optical path. The first processing surface 120 includes a third sub-processing surface 122 and a fourth sub-processing surface 123. The third sub-processing surface 122 is disposed on the first lens 111, and the fourth sub-processing surface 123 is disposed on the third lens 113. The third sub-processing surface 122 is used to perform divergence angle compression processing on the beam emitted by the light source 200 in the second direction, and the fourth sub-processing surface 123 is used to further perform divergence angle compression processing on the beam passing through the third sub-processing surface 122 in the second direction. The third lens 113 is also provided with a fourth processing surface 150, which is arc-shaped along the first direction and is used to adjust the size of the light spot formed by the beam in the first direction. The second processing surface 130 is disposed on the second lens 112, and the second processing surface 130 is also used to collimate the light beam passing through the fourth sub-processing surface 123 in the second direction.

[0157] It is understood that in this embodiment, the optical power ratio of the first processing surface 120 is the sum of the optical power ratios of the third sub-processing surface 122 and the fourth sub-processing surface 123. The fourth processing surface 150 is related to the third processing surface 140 in the above embodiment regarding the beam collimation component 100 (see details...). Figure 32a and Figure 32b The same function is used, so I won't go into details here.

[0158] Figure 36a and 36b In the specific embodiment shown, the fourth sub-processing surface 123 and the fourth processing surface 150 are respectively disposed on two opposite surfaces of the third lens 113. In other embodiments, such as Figure 37a and 37b As shown, the fourth sub-processing surface 123 and the fourth processing surface 150 can also be integrated onto one surface of the third lens 113.

[0159] Furthermore, in a preferred embodiment, a scheme combining the reflective component 300 with the lens 110, which includes a first lens 111, a second lens 112, and a third lens 113, can be adopted. Please refer to [link / reference] for details. Figure 38a and 38b The figures show the structures in the second and first directions, respectively. As shown in the figure, the reflective component 300 is disposed between the third lens 113 and the second lens 112 to change the direction of the light path.

[0160] Under high or low temperature conditions, based on the principle of thermal expansion and contraction of the components in the laser emitting device 1000, the lenses are prone to slight movement, which in turn affects the divergence angle and directivity of the final output beam. Figure 38a and Figure 38b In the embodiment shown, by changing the direction of the light path through the reflective component 300, the path length between the third lens 113 and the second lens 112 can be extended, thereby achieving a beam expansion effect. Furthermore, the beam expander solution composed of the third lens 113, the reflective component 300, and the second lens 112 can reduce the sensitivity of the lens to minute movements, ensuring that the divergence angle and directivity of the final output light change little under high or low temperatures.

[0161] Please see Figure 39 The figure shows the structure of a laser emitting device provided in an embodiment of this application. As shown in the figure, in some embodiments, the laser emitting device 1000 further includes a diffusion component 400. In the optical path, the beam collimation component 100 is located between the light source 200 and the diffusion component 400. The diffusion component 400 is used to diffuse the light beam that has passed through the beam collimation component 100.

[0162] In some embodiments, it can also target Figure 38a The embodiment shown further adds a diffusion component 400 to form as follows: Figure 40 The scheme shown achieves the diffusion of the light beam.

[0163] By setting a diffusion component 400 in the optical path and after the beam collimation component 100, the collimated beam can be expanded, which can effectively increase the detection range when the laser emitting device 1000 is applied to the field of ranging.

[0164] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and not to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application. In particular, as long as there is no structural conflict, the various technical features mentioned in the various embodiments can be combined in any way.

Claims

1. A beam collimation assembly for collimating a light source whose outer contour is strip-shaped along a first direction, wherein the light source includes a plurality of light-emitting positions distributed along the first direction, characterized in that, Includes a lens, the lens having a first processing surface and a second processing surface; The first processing surface is arc-shaped along the second direction. The first processing surface is used to compress the divergence angle of the light beam emitted by the light source in the second direction, wherein the second direction is perpendicular to the first direction. The second processing surface is a single rotationally symmetric curved surface. The second processing surface is configured such that, along the second direction, the light beams emitted from each emitting position of the light source, the light beams with the largest angle between the light beam and the optical axis of that emitting position and the light beams deviating to both sides, are respectively incident on both sides of the central axis of the second processing surface. The second processing surface is used to collimate the light beams passing through the first processing surface and to compensate for the optical path difference formed by at least part of the light beams passing through the first processing surface. The optical power ratio of the second processing surface is not 0, and the sum of the optical power ratio of the first processing surface and the optical power ratio of the second processing surface is 100%.

2. The beam collimation assembly according to claim 1, characterized in that, The first processing surface and the second processing surface are respectively disposed on the incident surface and the exit surface of the lens.

3. The beam collimation assembly according to claim 1, characterized in that, The lens includes a first lens and a second lens, with the first processing surface disposed on the first lens and the second processing surface disposed on the second lens.

4. The beam collimation assembly according to claim 2 or 3, characterized in that, The optical power ratio of the first processing surface is any value between 40% and 120%, and the optical power ratio of the second processing surface is any value between -20% and 60%.

5. The beam collimation assembly according to claim 4, characterized in that, The optical power ratio of the first processing surface is any value within the range of 70% or higher and less than 100%, and the optical power ratio of the second processing surface is any value within the range of 0% or lower than 30%.

6. The beam collimation assembly according to claim 2 or 3, characterized in that, The first processing surface includes multiple first sub-processing surfaces, and the optical power ratio of the first processing surface is the sum of the optical power ratios of the multiple first sub-processing surfaces.

7. The beam collimation assembly according to claim 3, characterized in that, The first processing surface includes multiple first sub-processing surfaces, and the optical power ratio of the first processing surface is the sum of the optical power ratios of the multiple first sub-processing surfaces; The first lens includes a plurality of first sub-lenses, and a plurality of first sub-processing surfaces are disposed on the plurality of first sub-lenses.

8. The beam collimation assembly according to claim 2 or 3, characterized in that, The second processing surface includes multiple second sub-processing surfaces, and the optical power ratio of the second processing surface is the sum of the optical power ratios of the multiple second sub-processing surfaces.

9. The beam collimation assembly according to claim 3, characterized in that, The second processing surface includes multiple second sub-processing surfaces, and the optical power ratio of the second processing surface is the sum of the optical power ratios of the multiple second sub-processing surfaces; The second lens includes a plurality of second sub-lenses, and a plurality of second sub-processing surfaces are disposed on the plurality of second sub-lenses.

10. The beam collimation assembly according to claim 2 or 3, characterized in that, The first processing surface is curved along both the first and second directions, and the radius of curvature of the first processing surface along the first direction is greater than its radius of curvature along the second direction. The first processing surface is also used to adjust the size of the light spot formed by the beam in the first direction.

11. The beam collimation assembly according to claim 3, characterized in that, The first lens is provided with a third processing surface, which is arc-shaped along the first direction. The third processing surface is used to adjust the size of the light spot formed by the light beam in the first direction.

12. A laser emitting device, characterized in that, The light source includes a light source whose outer contour of the light-emitting area is strip-shaped along the first direction and a beam collimation component as described in any one of claims 1-11, wherein the path of the light beam emitted by the light source forms an optical path, and in the optical path, the first processing surface is located between the light source and the second processing surface.

13. The laser emitting device according to claim 12, characterized in that, The laser emitting device further includes a reflective component disposed on the optical path. The reflective component is used to reflect the received light beam to adjust the direction of the optical path.

14. The laser emitting device according to claim 12 or 13, characterized in that, The lens includes a first lens, a third lens, and a second lens arranged sequentially along the direction of beam propagation in the optical path; The first processing surface includes a third sub-processing surface and a fourth sub-processing surface. The third sub-processing surface is disposed on the first lens, and the fourth sub-processing surface is disposed on the third lens. The third sub-processing surface is used to perform divergence angle compression processing on the light beam emitted by the light source in the second direction, and the fourth sub-processing surface is used to perform further divergence angle compression processing on the light beam passing through the third sub-processing surface in the second direction. The third lens is also provided with a fourth processing surface, which is arc-shaped along the first direction. The fourth processing surface is used to adjust the size of the light spot formed by the beam in the first direction. The second processing surface is disposed on the second lens, and the second processing surface is also used to collimate the light beam passing through the fourth sub-processing surface in the second direction.

15. The laser emitting device according to claim 12 or 13, characterized in that, The laser emitting device further includes a diffusion component. In the optical path, the beam collimation component is located between the light source and the diffusion component. The diffusion component is used to diffuse the light beam that has passed through the beam collimation component.

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