Multi-line output laser module and method for determining light pattern adjustment lens thereof

Abstract

The application discloses a multi-line output laser module and a method for determining an optical pattern adjusting lens of the multi-line output laser module. The multi-line output laser module comprises a laser chip and an optical pattern adjusting lens. The optical pattern adjusting lens comprises a first optical pattern adjusting surface and a second optical pattern adjusting surface. In a first extension direction, the extension length of a first adjusted laser signal is greater than the extension length of an initial laser signal; the extension length of a second adjusted laser signal is greater than the extension length of the first adjusted laser signal; in a second compression direction, the extension length of the second adjusted laser signal is less than the extension length of the first adjusted laser signal; wherein the first extension direction is parallel to a laser line, and the second compression direction intersects the first extension direction. By adopting the technical scheme, the module structure is simple, the number of optical elements is small, the assembly times are reduced, the assembly tolerance is small, the optical effect is improved, the assembly cost is reduced, and the automatic production is facilitated.

Description

Technical Field

[0001] This invention relates to the field of optoelectronic technology, and in particular to a method for determining the beam pattern of a multi-line output laser module and its beam pattern adjustment lens. Background Technology

[0002] Laser light sources are widely used in marking, positioning, lighting, 3D navigation and other fields. In some applications, laser light sources need to present certain shapes, such as crosshairs and multi-line intersecting spots.

[0003] Figure 1 This is a side view diagram of a multi-line output laser module in the prior art, for reference. Figure 1 The multi-line output laser module 01 includes a collimating lens 02 and a wave mirror 03. Figure 2 This is a top-view structural diagram of a multi-line output laser module in the prior art. The wave mirror 03 is composed of wave mirrors 031 and 032 arranged in different directions. The light 05 from the laser chip 04 first passes through a collimating lens to form collimated light 06, and then is elongated in multiple directions through the spliced ​​wave mirrors 031 and 032 to form a beam like... Figure 2 The cross-shaped light spot shown is 07.

[0004] Existing multi-line output laser modules typically require two optical elements for collimation and stretching, resulting in a complex design structure. The high precision required for assembling multiple optical structures also contributes to the high assembly cost of the module. Summary of the Invention

[0005] This invention provides a method for determining the beam pattern of a multi-line output laser module and its beam pattern adjustment lens, in order to solve the problems of complex structural design and high assembly cost of existing multi-line output laser modules.

[0006] According to one aspect of the present invention, a multi-line output laser module is provided, the multi-line output laser module being used to emit a light spot composed of at least two laser lines, each of the laser lines intersecting at the center of the light spot; the multi-line output laser module includes: a laser chip and a beam pattern adjustment lens;

[0007] The laser chip includes at least one light-emitting unit, which is used to emit an initial laser signal;

[0008] The beam pattern adjustment lens includes a first beam pattern adjustment surface and a second beam pattern adjustment surface; the first beam pattern adjustment surface is located on the propagation path of the initial laser signal and is used to adjust the initial laser signal to form a first adjusted laser signal; the second beam pattern adjustment surface is located on the propagation path of the first adjusted laser signal and is used to adjust the first adjusted laser signal to form a second adjusted laser signal.

[0009] In the first extension direction, the first adjusted laser signal has a length greater than that of the initial laser signal, and the second adjusted laser signal has a length greater than that of the first adjusted laser signal; in the second compression direction, the second adjusted laser signal has a length less than that of the first adjusted laser signal.

[0010] The multi-line output laser module includes a plurality of the first extension directions and a plurality of the second compression directions; the first extension direction is parallel to the laser line, and the second compression direction intersects the first extension direction.

[0011] Optionally, the light spot includes n laser lines; the first light type adjustment surface is determined by Boolean operation of n first free-form surfaces; the second light type adjustment surface is determined by Boolean operation of n second free-form surfaces; n≥2; the surface type of the first free-form surface is different from that of the second free-form surface.

[0012] Optionally, the surface type of the first free-form surface satisfies: z=A1*x 2 +B1*x 4 +C1*x 2 *y 2 .

[0013] Wherein, x is the coordinate value of the first direction, y is the coordinate value of the second direction, z is the coordinate value of the third direction, the third direction intersects the first direction and the second direction; A1, B1 and C1 are constant coefficients of the first free-form surface.

[0014] Optionally, the first light type adjustment surface is determined by Boolean operation of at least one first free-form surface and at least one third free-form surface;

[0015] The surface type of the third free-form surface satisfies: z=A2*x 2 +B2*x 4 +C2*x 2 *y 2 .

[0016] Wherein, A2, B2 and C2 are constant coefficients of the third free-form surface.

[0017] Optionally, the surface type of the second free-form surface satisfies:

[0018]

[0019] Wherein, x is the coordinate value of the first direction, y is the coordinate value of the second direction, z is the coordinate value of the third direction, the third direction intersects the first direction and the second direction; c is the radius of curvature; k is the conic constant; D1, E1 and F1 are constant coefficients of the second free-form surface respectively.

[0020] Optionally, the second light type adjustment surface is determined by at least one of the second free-form surface and at least one fourth free-form surface through Boolean operation.

[0021] The surface type of the fourth free-form surface satisfies:

[0022]

[0023] D2, E2 and F2 are constant coefficients of the fourth free-form surface respectively.

[0024] According to another aspect of the present application, a method for determining a light type adjustment lens of a multi-line output laser module is provided, which is used for determining the light type adjustment lens of the multi-line output laser module as claimed in the above claims; the method comprises:

[0025] determining first light spot information of the initial laser signal emitted by the laser chip;

[0026] determining second light spot information of the second adjustment laser signal required;

[0027] determining a plurality of first free-form surfaces and a plurality of second free-form surfaces according to the first light spot information and the second light spot information;

[0028] performing first Boolean operation on the plurality of first free-form surfaces to obtain the first light type adjustment surface;

[0029] performing second Boolean operation on the plurality of second free-form surfaces to obtain the second light type adjustment surface;

[0030] determining the light type adjustment lens according to the first light type adjustment surface and the second light type adjustment surface.

[0031] Optionally, performing first Boolean operation on the plurality of first free-form surfaces to obtain the first light type adjustment surface comprises:

[0032] solidifying the plurality of first free-form surfaces and performing Boolean intersection to determine a first solid including the first light type adjustment surface.

[0033] Optionally, performing first Boolean operation on the plurality of second free-form surfaces to obtain the second light type adjustment surface comprises:

[0034] solidifying the plurality of second free-form surfaces and performing Boolean addition to determine a second solid including the second light type adjustment surface.

[0035] Optionally, determining the light type adjustment lens according to the first light type adjustment surface and the second light type adjustment surface comprises:

[0036] determining the first entity and the second entity according to the first light type adjustment surface and the second light type adjustment surface;

[0037] determining the light type adjustment lens by performing Boolean subtraction of the second entity from the first entity.

[0038] The technical scheme of the embodiment of the present application can complete collimation and beam splitting and lengthening of a light beam by only arranging one light type adjustment lens, realize adjustment of an initial laser signal emitted by a laser chip into a light spot composed of at least two laser lines, has simple module structure, small number of optical elements, simple process, reduces assembly times, has small assembly tolerance, improves optical effect, reduces assembly cost, and is conducive to automatic production.

[0039] It should be understood that the content described in this part is not intended to identify key or important features of the embodiments of the present application, nor is it used to limit the scope of the present application. Other features of the present application will become apparent from the following description. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical scheme in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative labor.

[0041] Figure 1 is a side view structural schematic diagram of a multi-line output laser module in the prior art;

[0042] Figure 2 is a top view structural schematic diagram of a multi-line output laser module in the prior art;

[0043] Figure 3 is a front view structural schematic diagram of a multi-line output laser module provided by the embodiment of the present application;

[0044] Figure 4 is a light ray transmission schematic diagram provided by the embodiment of the present application;

[0045] Figure 5 is a light spot change schematic diagram provided by the embodiment of the present application;

[0046] Figure 6 is a cross-line light spot schematic diagram provided by the embodiment of the present application;

[0047] Figure 7 is a sectional view of a multi-line output laser module provided by the embodiment of the present application along a first extension direction;

[0048] Figure 8 A cross-sectional view of a multi-line output laser module provided by an embodiment of the present application is cut along a second compression direction;

[0049] Figure 9 A flowchart of a method for determining an optical type adjustment lens of a multi-line output laser module provided by an embodiment of the present application;

[0050] Figure 10 A splicing schematic diagram of a first free-form surface provided by an embodiment of the present application;

[0051] Figure 11 A splicing schematic diagram of a second free-form surface provided by an embodiment of the present application. DETAILED DESCRIPTION

[0052] In order to make the personnel in the technical field better understand the present application scheme, the technical scheme in the embodiments of the present application will be described clearly and completely below by combining the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the person skilled in the art without creative labor should belong to the scope of protection of the present application.

[0053] It should be noted that the terms "first", "second" and the like in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily indicate a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion, for example, a process, method, system, product or device including a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0054] Figure 3 A structural schematic diagram of a front view structural schematic diagram of a multi-line output laser module provided by an embodiment of the present application, referring to Figure 3 The multi-line output laser module includes a laser chip 10 and an optical type adjustment lens 20, and the multi-line output laser module can be used to emit a light spot composed of at least two laser lines, and each laser line intersects at the center of the light spot.

[0055] The laser chip 10 includes at least one light-emitting unit 11, which emits an initial laser signal 31. The light pattern adjustment lens 20 includes a first light pattern adjustment surface 21 and a second light pattern adjustment surface 22. The first light pattern adjustment surface 21 is located on the propagation path of the initial laser signal 31 and is used to adjust the initial laser signal 31 to form a first adjusted laser signal 32. The second light pattern adjustment surface 22 is located on the propagation path of the first adjusted laser signal 32 and is used to adjust the first adjusted laser signal 32 to form a second adjusted laser signal 33.

[0056] Along the first extension direction, the extension length of the first adjusted laser signal 32 is greater than the extension length of the initial laser signal 31; the extension length of the second adjusted laser signal 33 is greater than the extension length of the first adjusted laser signal 32; along the second compression direction, the extension length of the second adjusted laser signal 33 is less than the extension length of the first adjusted laser signal 32; wherein, the multi-line output laser module includes multiple first extension directions and multiple second compression directions; the first extension direction is parallel to the laser line, and the second compression direction intersects with the first extension direction.

[0057] For ease of explanation, the embodiments of the present invention are all illustrated using the example of a multi-line output laser module that emits a spot composed of two laser lines. Specifically, the multi-line output laser module includes two first extension directions and two second compression directions. For clarity, the two laser lines are illustrated as perpendicular to each other. One of the first extension directions is parallel to the first direction X, and the second compression direction intersecting this first extension direction is parallel to the second direction Y. The other first extension direction is parallel to the second direction Y, and the second compression direction intersecting this first extension direction is parallel to the first direction X. The plane formed by the first direction X and the second direction Y is parallel to the plane where the laser chip 10 is located, and the third direction Z is the thickness direction of the laser chip 10. It is understood that the above description is merely an exemplary example and is not limited thereto.

[0058] In this context, laser chip 10 refers to a micro-light-emitting chip, including but not limited to VCSEL chips and EEL chips. VCSEL chips, in particular, offer advantages such as high mass production capability and low cost, making them a relatively ideal laser light source. When laser chip 10 is a VCSEL chip, it may include multiple light-emitting units 11. This embodiment of the invention does not limit the arrangement of these multiple light-emitting units 11. When laser chip 10 is an EEL chip, it may include only one light-emitting unit 11.

[0059] For example, Figure 4 This is a schematic diagram of light transmission provided in an embodiment of the present invention. Figure 5 This is a schematic diagram of light spot change provided in an embodiment of the present invention. Figure 6 This is a schematic diagram of a crosshair-shaped light spot provided in an embodiment of the present invention. (Reference) Figure 4and Figure 5 The spot of the initial laser signal 31 is circular. After the initial laser signal 31 passes through the first light type adjustment surface 21, the first adjustment laser signal 32 is formed, and the spot of the first adjustment laser signal 32 is composed of two thicker and shorter laser lines. At this time, the length of the laser lines is longer than that of the spot of the initial laser signal 31, the width of the laser lines is basically consistent with that of the spot of the initial laser signal 31, and the initial laser signal 31 is stretched along the first extension direction. After the first adjustment laser signal 32 passes through the second light type adjustment surface 22, the second adjustment laser signal 33 is formed. Compared with the spot of the first adjustment laser signal 32, the length of the laser lines in the spot of the second adjustment laser signal 33 is longer, and the width is narrower. The two laser lines in the first adjustment laser signal 32 are stretched along the first extension direction parallel to themselves and compressed along the second compression direction perpendicular to themselves, respectively.

[0060] It can be understood that when the multi-line output laser module outputs a spot composed of two laser lines, the two laser lines can also be perpendicular to each other. The multi-line output laser module can output a spot composed of two laser lines with an arbitrary included angle.

[0061] The multi-line output laser module provided by the embodiment of the application can complete the collimation and beam splitting and lengthening of the light beam by only arranging one light type adjustment lens, realize adjustment of the initial laser signal emitted by the laser chip into a spot composed of at least two laser lines, and has the advantages of simple module structure, small number of optical elements, simple process, reduced assembly times, small assembly tolerance, improved optical effect, reduced assembly cost, and facilitation of automatic production.

[0062] Optionally, the spot output by the multi-line output laser module includes n laser lines; the first light type adjustment surface 21 is determined by Boolean operation of n first free-form surfaces 2101; the second light type adjustment surface 22 is determined by Boolean operation of n second free-form surfaces 2202; wherein n is greater than or equal to 2; the surface type of the first free-form surface 2101 is different from the surface type of the second free-form surface 2202.

[0063] Exemplarily, Figure 7 A cross-sectional view of the multi-line output laser module provided by the embodiment of the application along a first extension direction, Figure 8 A cross-sectional view of the multi-line output laser module provided by the embodiment of the application along a second compression direction, with reference to Figure 7 and Figure 8The first free-form surface 2201 and the second free-form surface 2202 cooperate with each other to stretch the initial laser signal 31 in the first extension direction and compress the initial laser signal 31 in the first compression direction. Each first free-form surface 2101 and each second free-form surface 2202 can form a group of light pattern adjustment units, and n first free-form surfaces 2101 and n second free-form surfaces 2202 can form n groups of light pattern adjustment units. Each group of light pattern adjustment units can stretch the initial laser signal 31 in the first extension direction and compress the initial laser signal 31 in the second compression direction to form a light spot composed of n laser lines, and the n laser lines intersect at the center of the light spot.

[0064] In an optional embodiment, when a light spot composed of n laser lines is desired, n groups of light pattern adjustment units can be arranged at an angular interval of 180° / n, and then n first free-form surfaces 2201 and n second free-form surfaces 2202 are overlapped. In the thickness direction of the laser chip 10, the initial laser signal 31 passes through one or more first free-form surfaces 2101, and the second and subsequent first free-form surfaces are removed, and only the first free-form surface 2101 closest to the laser chip 10 is retained, which is the first light pattern adjustment surface 21. In the thickness direction of the laser chip 10, the first adjusted laser signal 32 passes through one or more second free-form surfaces 2202, and only the second free-form surface 2202 farthest from the laser chip 10 is retained, which is the second light pattern adjustment surface 22. The initial laser signal 31 passes through the light pattern adjustment lens 20 formed by the combination of the first light pattern adjustment surface 21 and the second light pattern adjustment surface 22, and n laser lines with the same included angle can be formed, and the n laser lines intersect at the center of the light spot.

[0065] It can be understood that the n groups of light pattern adjustment units can not be arranged at an angular interval of 180° / n, but can be arranged at different angular intervals to obtain n laser lines with different included angles, and the n laser lines intersect at the center of the light spot.

[0066] Optionally, the first light pattern adjustment surface is determined by Boolean operation of a plurality of first free-form surfaces, and the surface type of the first free-form surface satisfies: z=A1*x 2 +B1*x 4 +C1*x 2 *y 2 ; wherein x is a coordinate value in the first direction, y is a coordinate value in the second direction, and z is a coordinate value in the third direction, the third direction intersects the first direction and the second direction; A1, B1 and C1 are constant coefficients of the first free-form surface.

[0067] In an optional embodiment, the absolute value |B1| of the constant coefficient B1 of the first free-form surface is greater than the absolute value |A1| of the constant coefficient A1 of the first free-form surface; and the constant coefficient C1 of the first free-form surface ranges from -10 to 0. By reasonably setting the constant coefficients A1, B1 and C1, the stretching degree of the first free-form surface to the initial laser signal along the first direction X can be controlled.

[0068] Optionally, the first light type adjustment surface is determined by at least one first free-form surface and at least one third free-form surface through Boolean operation; the surface type of the third free-form surface satisfies z=A2*x 2 +B2*x 4 +C2*x 2 *y 2 ; wherein A2, B2 and C2 are constant coefficients of the second free-form surface.

[0069] Optionally, A1≠A2, B1≠B2, C1≠C2, the surface type of the third free-form surface is similar to but not the same as that of the first free-form surface; by reasonably setting the constant coefficients A2, B2 and C2, the stretching degree of the third free-form surface to the initial laser signal along the first direction can be controlled, so that the multi-line output laser module outputs a light spot composed of laser lines of different lengths.

[0070] Optionally, the second light type adjustment surface is determined by a plurality of second free-form surfaces through Boolean operation, and the surface type of the second free-form surface satisfies: wherein x is the coordinate value of the first direction, y is the coordinate value of the second direction, z is the coordinate value of the third direction, the third direction intersects with the first direction and the second direction; c is the radius of curvature; k is the conic constant; D1, E1 and F1 are constant coefficients of the second free-form surface.

[0071] In an optional embodiment, the radius of curvature c ranges from -4 to 0.5; the conic constant k ranges from -2 to 0; the constant coefficient D1 of the second free-form surface ranges from 0 to 0.5; the constant coefficient E1 of the second free-form surface ranges from -1 to 1; and the constant coefficient F1 of the second free-form surface ranges from -1 to 2. By reasonably setting the radius of curvature c, the conic constant k, the constant coefficient D1, the constant coefficient E1 and the constant coefficient F1, the stretching degree of the second free-form surface to the first adjustment laser signal along the first direction and the compression degree of the second free-form surface to the first adjustment laser signal along the second direction can be controlled.

[0072] Optionally, the second light type adjustment surface is determined by at least one second free-form surface and at least one fourth free-form surface through Boolean operation; the surface type of the fourth free-form surface satisfies: Wherein, D2, E2 and F2 are constant coefficients of the fourth free-form surface respectively.

[0073] For example, D1≠D2, E1≠E2, F1≠F2, the fourth free-form surface is similar to the second free-form surface in surface type, but not the same, by reasonably setting the constant coefficient D2, the constant coefficient E2 and the constant coefficient F2, the stretching degree of the fourth free-form surface to the first adjustment laser signal along the first extension direction and the compression degree along the second compression direction can be controlled, so that the multi-line output laser module outputs a light spot composed of laser lines with different lengths and / or different widths.

[0074] In an optional embodiment, the constant coefficients of the curved surface of the central region of the first light type adjustment surface and the second light type adjustment surface can be different from the constant coefficients of the non-central region of the first light type adjustment surface and the second light type adjustment surface, so that the stretching of the light type adjustment lens to the signal in the center of the initial laser signal can be reduced, on the one hand, the brightness of the center of the light spot output by the multi-line output laser module can be avoided to be too low, on the other hand, the brightness of the center of the light spot output by the multi-line output laser module can be improved, which can be applied to different application scenarios.

[0075] Based on the same inventive concept, the embodiment of the present application provides a method for determining a light type adjustment lens of a multi-line output laser module, Figure 9 A flow chart of a method for determining a light type adjustment lens of a multi-line output laser module is provided in the embodiment of the present application, and the parameter determination method can be used to determine the parameters of the linear laser module provided in the embodiment of the present application. As shown in the figure, Figure 9 The method comprises the following steps:

[0076] S110, determining first light spot information of an initial laser signal emitted by a laser chip.

[0077] The first light spot information includes the outline of a light-emitting area composed of light-emitting units, the shape of the light-emitting units, the divergence angle of the initial laser signal along the first direction, the divergence angle of the initial laser signal along the second direction, and the like.

[0078] S120, determining second light spot information of a second adjustment laser signal required.

[0079] The second light spot information includes the number of laser lines of the required light spot, the included angle between the laser lines, the length of each laser line, the width of each laser line, the distribution of laser lines with different lengths or widths, and the like.

[0080] S130, determining a plurality of first free-form surfaces and a plurality of second free-form surfaces according to the first light spot information and the second light spot information.

[0081] Exemplarily, according to the first light spot information and the second light spot information, the number of laser lines, and the width and length of each laser line can be determined, and thus the first free-form surface and the second free-form surface of each light type adjustment unit can be determined.

[0082] S140, performing first Boolean operation on the plurality of first free-form surfaces to obtain a first light type adjustment surface.

[0083] Exemplarily, the plurality of first free-form surfaces can be solidified and subjected to Boolean intersection to determine a first solid including the first light type adjustment surface. Figure 10 A first free-form surface splicing schematic diagram provided for an embodiment of the present application is referred to in FIG. 2. Figure 10 The first free-form surface 2101 is taken as an outer surface, the first free-form surface 2101 is solidified to obtain a solid 101, and then according to the first light spot information and the second light spot information, a corresponding number of solids 101 including the first free-form surface 2101 are arranged at a certain angle interval, the solids 101 overlap each other, only the intersecting part (subjected to AND operation) is reserved, and thus a first solid 110 including the first light type adjustment surface 21 is obtained, and the upper surface of the first solid 110 is the first light type adjustment surface 21.

[0084] S150, performing second Boolean operation on the plurality of second free-form surfaces to obtain a second light type adjustment surface.

[0085] Exemplarily, the plurality of second free-form surfaces can be solidified and subjected to Boolean addition to determine a second solid including the second light type adjustment surface. Figure 11 A second free-form surface splicing schematic diagram provided for an embodiment of the present application is referred to in FIG. 2. Figure 11 The second free-form surface 2202 is taken as an outer surface, the second free-form surface 2202 is solidified to obtain a solid 202, and then according to the first light spot information and the second light spot information, a corresponding number of solids 202 including the second free-form surface 2202 are arranged at a certain angle interval, the solids 202 overlap each other, and the part of all the solids 202 including the second free-form surface 2202 is reserved (subjected to OR operation), and thus a second solid 220 including the second light type adjustment surface 22 is obtained, and the upper surface of the second solid 220 is the first light type adjustment surface 22.

[0086] S160, determining a light type adjustment lens according to the first light type adjustment surface and the second light type adjustment surface.

[0087] Exemplarily, the first entity 110 and the second entity 220 are determined according to the first light type adjustment surface 21 and the second light type adjustment surface 22; the second entity 220 is subtracted from the first entity 110 to determine the light type adjustment lens 20. The first entity 110 can be inserted from the side of the second entity 220 away from the second light type adjustment surface 22, so that the center of the first light type adjustment surface 21 and the center of the second light type adjustment surface 22 are at a preset interval, and then the first entity 110 is subtracted from the second entity 220, so as to obtain the light type adjustment lens 20 combined by the first light type adjustment surface 21 and the second light type adjustment surface 22. In an optional embodiment, the preset interval between the center of the first light type adjustment surface 21 and the center of the second light type adjustment surface 22 is 0.5mm-2.5mm, and by reasonably setting the size of the interval between the center of the first light type adjustment surface 21 and the center of the second light type adjustment surface 22, the shaping degree of the light type adjustment lens 20 on the initial laser signal can be controlled.

[0088] In an optional embodiment, the light type adjustment lens can adopt a material with a preset refractive index range, for example, a light-transmitting material with a refractive index greater than 1.4 such as resin, plastic or optical glass can be selected.

[0089] According to the first light spot information and the second light spot information, the embodiment of the present application can select a suitable light type adjustment lens to reduce the use cost.

[0090] The determination method of the light type adjustment lens of the multi-line output laser module provided by the embodiment of the present application can determine the light type adjustment lens of the multi-line output laser module provided by any embodiment of the present application, and has the corresponding function modules and beneficial effects of the multi-line output laser module.

[0091] It should be understood that the various forms of flow shown above can be reordered, added or deleted steps. For example, the steps described in the present application can be executed in parallel, sequentially or in different orders, as long as the desired results of the technical solutions of the present application can be achieved, which is not limited herein.

[0092] The above specific embodiments do not constitute a limitation on the protection scope of the present application. Those skilled in the art should understand that various modifications, combinations, sub-combinations and substitutions can be made according to design requirements and other factors. Any modification, equivalent replacement and improvement within the spirit and principles of the present application shall be included in the protection scope of the present application.

Claims

1. A multi-line output laser module, characterized in that, The multi-line output laser module is used to emit a light spot composed of at least two laser lines, each laser line intersecting at the center of the light spot; the multi-line output laser module includes: a laser chip and a beam pattern adjustment lens; The laser chip includes at least one light-emitting unit, which is used to emit an initial laser signal; The beam pattern adjustment lens includes a first beam pattern adjustment surface and a second beam pattern adjustment surface; the first beam pattern adjustment surface is located on the propagation path of the initial laser signal and is used to adjust the initial laser signal to form a first adjusted laser signal; the second beam pattern adjustment surface is located on the propagation path of the first adjusted laser signal and is used to adjust the first adjusted laser signal to form a second adjusted laser signal. Along the first extension direction, the extension length of the first adjusted laser signal is greater than the extension length of the initial laser signal; the extension length of the second adjusted laser signal is greater than the extension length of the first adjusted laser signal; along the second compression direction, the extension length of the second adjusted laser signal is less than the extension length of the first adjusted laser signal. The multi-line output laser module includes multiple first extension directions and multiple second compression directions; the first extension direction is parallel to the laser line, and the second compression direction intersects the first extension direction; The light spot comprises n laser lines; the first light pattern adjustment surface is determined by Boolean operation from n first freeform surfaces; the second light pattern adjustment surface is determined by Boolean operation from n second freeform surfaces; where n≥2; the surface shapes of the first freeform surfaces and the second freeform surfaces are different; The constant coefficient of the curved surface in the central region of the first light pattern adjustment surface is different from the constant coefficient of the non-central region of the first light pattern adjustment surface; the constant coefficient of the curved surface in the central region of the second light pattern adjustment surface is different from the constant coefficient of the non-central region of the second light pattern adjustment surface.

2. The multi-line output laser module according to claim 1, characterized in that, The surface shape of the first freeform surface satisfies: ; Where x is the coordinate value of the first direction, y is the coordinate value of the second direction, and z is the coordinate value of the third direction, which intersects both the first and second directions; A1, B1, and C1 are the constant coefficients of the first freeform surface.

3. The multi-line output laser module according to claim 2, characterized in that, The first light pattern adjustment surface is determined by Boolean operation from at least one first freeform surface and at least one third freeform surface; The surface shape of the third free surface satisfies: ; Wherein, A2, B2 and C2 are the constant coefficients of the third free surface.

4. The multi-line output laser module according to claim 1, characterized in that, The surface shape of the second freeform surface satisfies: ; Where x is the coordinate value of the first direction, y is the coordinate value of the second direction, and z is the coordinate value of the third direction, wherein the third direction intersects both the first direction and the second direction; The radius of curvature; It is the conic constant; D1, E1, and F1 are the constant coefficients of the second free surface, respectively.

5. The multi-line output laser module according to claim 4, characterized in that, The second light pattern adjustment surface is determined by Boolean operations on at least one second freeform surface and at least one fourth freeform surface; The surface shape of the fourth free surface satisfies: ; Where D2, E2, and F2 are the constant coefficients of the fourth free surface.

6. A method for determining the beam pattern adjustment lens of a multi-line output laser module, characterized in that, A lens for determining the beam pattern adjustment lens of the multi-line output laser module according to any one of claims 1-5; the determining method includes: Determine the first spot information of the initial laser signal emitted by the laser chip; Determine the second spot information of the required second adjusted laser signal; Based on the first spot information and the second spot information, multiple first freeform surfaces and multiple second freeform surfaces are determined; Perform a first Boolean operation on multiple first freeform surfaces to obtain the first light pattern adjustment surface; Perform a second Boolean operation on multiple second freeform surfaces to obtain the second light pattern adjustment surface; The light pattern adjustment lens is determined based on the first light pattern adjustment surface and the second light pattern adjustment surface.

7. The method for determining the beam pattern adjustment lens of a multi-line output laser module according to claim 6, characterized in that, Performing a first Boolean operation on multiple first freeform surfaces yields the first light pattern adjustment surface, including: The first freeform surfaces are solidified and Boolean intersections are performed to determine the first solid including the first light pattern adjustment surface.

8. The method for determining the beam pattern adjustment lens of a multi-line output laser module according to claim 7, characterized in that, Performing a first Boolean operation on multiple second freeform surfaces yields the second light pattern adjustment surface, including: Multiple second freeform surfaces are solidified and Boolean summed to determine a second solid including the second light pattern adjustment surface.

9. The method for determining the beam pattern adjustment lens of a multi-line output laser module according to claim 8, characterized in that, Determining the light pattern adjustment lens based on the first light pattern adjustment surface and the second light pattern adjustment surface includes: The first entity and the second entity are determined based on the first light pattern adjustment surface and the second light pattern adjustment surface; The second entity is subtracted from the first entity by a Boolean subtraction to determine the light pattern adjustment lens.

Images