A laser

Abstract

The present invention relates to the field of laser technology, and specifically to a laser. The laser provided by the present invention includes a shell, a plurality of laser chips and reflectors corresponding to the laser chips one by one; the plurality of laser chips and the plurality of reflectors are installed in the shell, and the plurality of reflectors are distributed in a spiral shape in the shell. In the present application, the plurality of reflectors are distributed in a spiral shape in the shell, so that the projections of the plurality of beams of light reflected by the corresponding reflectors from the plurality of laser cores on the plane where the light outlet is located are arranged in a spiral shape. The spiral light spot is more adaptable to the aperture of the transmission optical fiber than the rectangular light spot, thereby making full use of the aperture of the transmission optical fiber and ensuring uniform energy in the output transmission optical fiber, thereby improving the output laser quality; and the outer wall of the shell can be directly placed in water for heat dissipation, without the need for additional air cooling or water cooling heat dissipation mechanisms, which can reduce the volume of the laser and save the manufacturing cost of the laser.

Description

Technical Field

[0001] The present invention relates to the technical field of lasers, and in particular to a laser. Background Art

[0002] A laser is a device that can be used to emit laser light. Laser light is generated by a laser chip installed in it. However, the power of a single laser chip is limited, and the brightness of the generated laser cannot meet actual requirements.

[0003] In existing lasers, the distribution area of ​​the corresponding multiple light spots after focusing and combining the multiple laser beams output by multiple laser chips is rectangular, which cannot fully output the large numerical aperture of the transmission optical fiber, resulting in a waste of the transmission optical fiber aperture space.

[0004] In the prior art, the laser chip is also arranged on the outer wall of the shell, and the shell cannot be directly placed in water for cooling. An additional air cooling or water cooling structure is required, which increases the volume and manufacturing cost of the entire laser. Summary of the invention

[0005] (I) The technical problem to be solved by the present invention is that the brightness of the generated laser cannot meet the actual requirements, the transmission optical fiber aperture space is wasted, and an additional air cooling or water cooling structure is required, which increases the size and manufacturing cost of the laser.

[0006] (II) Technical solution

[0007] In order to solve the above technical problems, an embodiment of the present invention provides a housing, a plurality of laser chips and reflective elements corresponding to the laser chips one by one;

[0008] A receiving cavity with an open end is formed in the shell, the open end of the shell is a light outlet, and the plurality of laser chips and the plurality of reflective elements are installed in the receiving cavity;

[0009] The reflective element is used to reflect the light beam emitted by the corresponding laser chip out of the light outlet;

[0010] The plurality of reflectors are distributed in a spiral shape in the housing, so that the projections of the plurality of beams of light reflected by the plurality of laser chips through the corresponding reflectors on the plane where the light outlets are located are arranged in a spiral shape.

[0011] According to an embodiment of the present invention, the shell is in a conical shape, one end of the shell is a tip, and the other end is the light outlet;

[0012] The plurality of laser chips are mounted on the inner wall of the housing, and the plurality of laser chips are spaced apart and arranged in a spiral shape.

[0013] According to an embodiment of the present invention, the number of laser chips arranged on the inner wall of the housing near the light outlet is greater than the number of laser chips arranged near the tip.

[0014] According to an embodiment of the present invention, a number of fixing mechanisms corresponding to the number of the reflective elements are further provided in the accommodating cavity, and the plurality of reflective elements are respectively arranged on the fixing mechanisms.

[0015] According to one embodiment of the present invention, the fixing mechanism comprises a fixing column, the axis of the fixing column coincides with the axis of the housing, the reflector comprises a reflector, and the angle between the axis of the housing and the reflection plane of the reflector is °;

[0016] The light beam emitted by the laser chip is perpendicular to the axis of the housing, and the transmission direction of the light beam reflected by the reflector is parallel to the axis of the housing.

[0017] According to an embodiment of the present invention, the fixing mechanism further includes a fixing seat corresponding to the reflective element one by one, the fixing seat is fixed to the outer wall surface of the fixing column, and the reflector is arranged on the corresponding fixing seat.

[0018] According to an embodiment of the present invention, the laser further includes a mounting seat corresponding to the laser chip one by one, the mounting seat is fixed on the inner wall of the shell, and the laser chip is fixed on the corresponding mounting seat.

[0019] According to an embodiment of the present invention, a mounting surface is formed on the mounting seat, and the axis of the shell is perpendicular to the plane where the mounting surface is located;

[0020] The laser also includes a sheet-shaped heat sink, which is arranged at the bottom of the laser chip and fixed on the mounting surface.

[0021] According to one embodiment of the present invention, the laser further comprises a fast axis collimator and a slow axis collimator, wherein the fast axis collimator and the slow axis collimator are sequentially arranged between the laser chip and the reflector;

[0022] The laser emitted by the laser chip passes through the fast axis collimator and the slow axis collimator in sequence, and then is reflected by the reflector.

[0023] According to one embodiment of the present invention, the laser further comprises a focusing mirror and a transmission optical fiber, wherein the focusing mirror is disposed between the light outlet and the transmission optical fiber, and is used to gather the light beams reflected by the plurality of reflectors and introduce them into the transmission optical fiber.

[0024] Beneficial effects of the present invention: The laser provided by the present invention includes a housing, a plurality of laser chips and a reflector corresponding to the laser chips one by one; wherein a housing cavity is formed inside the housing, the plurality of laser chips and the plurality of reflectors are installed in the housing, and the plurality of reflectors are distributed in a spiral shape in the housing, so that the projections of the plurality of beams of light reflected by the plurality of laser cores through the corresponding reflectors on the plane where the light outlet is located are arranged in a spiral shape. The light beams emitted by all laser chips are reflected by the reflectors to form a spiral light spot at the light outlet, and the spiral light spot is more adaptable to the aperture of the transmission optical fiber than the rectangular light spot, thereby making full use of the aperture of the transmission optical fiber and ensuring uniform energy in the output transmission optical fiber, thereby improving the output laser quality; and since the laser chip is arranged in the housing cavity formed by the housing, as long as the water does not overflow the light outlet and enter the housing cavity, it will not contact the laser chip to cause a short circuit of the laser chip, and the outer wall of the housing can be directly placed in water for heat dissipation, and no additional air cooling or water cooling heat dissipation mechanism is required, which can reduce the volume of the laser and save the manufacturing cost of the laser. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0026] Figure 1 A schematic diagram of the structure of a laser provided by one embodiment of the present invention with a schematic diagram of light path transmission;

[0027] Figure 2 A three-dimensional diagram of a laser provided by one embodiment of the present invention;

[0028] Figure 3 for Figure 2 A magnified view of part A;

[0029] Figure 4 for Figure 2 A magnified view of part B;

[0030] Figure 5 Top view of the laser with the mount and slow axis collimator removed;

[0031] Figure 6 A schematic diagram of a light spot projection of a light beam emitted by a laser provided in an embodiment of the present invention;

[0032] in, Figure 6 The rectangular blocks in the figure are light spot projections, and the dotted lines are not light spot projections.

[0033] Icon: 1-laser; 11-housing; 111-accommodating cavity; 112-light outlet; 113-mounting seat; 1131-mounting surface; 114-fixing column; 1141-fixing seat;

[0034] 12-laser chip; 13-heat sink; 14-fast axis collimator; 15-slow axis collimator; 16-focusing mirror; 17-reflector; 18-transmission optical fiber. DETAILED DESCRIPTION

[0035] In order to more clearly understand the above-mentioned purposes, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. In the absence of conflict, the embodiments of the present application and the features in the embodiments can be combined with each other. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without making creative work are within the scope of protection of the present invention.

[0036] like Figures 1 to 6 As shown, an embodiment of the present invention provides a laser 1, comprising a housing 11, a plurality of laser chips 12, and reflectors corresponding to the laser chips 12. A housing cavity 111 with an open end is formed in the housing 11, and the open end of the housing 11 is a light outlet 112. The plurality of laser chips 12 and the plurality of reflectors are installed in the housing cavity 111; the reflectors are used to reflect the light beams emitted by the corresponding laser chips 12 out of the light outlet 112; the plurality of reflectors are distributed in a spiral shape in the housing 11, so that the projections of the plurality of light beams reflected by the plurality of laser chips 12 through the corresponding reflectors on the plane where the light outlet is located are arranged in a spiral shape.

[0037] The laser 1 provided by the present invention comprises a housing 11, a plurality of laser chips 12 and reflectors corresponding to the laser chips 12. A receiving cavity 111 is formed inside the housing 11, and the plurality of laser chips 12 and the plurality of reflectors are installed in the housing 11. Figure 5 As shown, the multiple reflectors are distributed in a spiral shape in the accommodating cavity 111, so that the projections of the multiple beams of light reflected by the corresponding reflectors from the multiple laser cores 12 on the plane where the light outlet 112 is located are arranged in a spiral shape. The light beams emitted by all the laser chips 12 are reflected by the reflectors to form a spiral light spot. Compared with the rectangular light spot, the spiral light spot is more adaptable to the aperture of the transmission optical fiber 18, thereby making full use of the aperture of the transmission optical fiber 18 and ensuring uniform energy in the output transmission optical fiber, thereby improving the output laser quality.

[0038] And because the laser chip 12 is arranged in the accommodating cavity 111 formed by the shell 11, the outer wall surface of the shell 11 can be directly placed in water for heat dissipation. As long as the water does not overflow the light outlet 112 and enter the accommodating cavity 111, it will not contact the laser chip 12 to cause a short circuit of the laser chip 12, and will not affect the optical devices in the accommodating cavity 111. There is no need to set up an additional air-cooling or water-cooling heat dissipation mechanism, which can reduce the volume of the laser 1 and save the manufacturing cost of the laser 1. In addition, since the outer wall of the shell 11 can be directly placed in water, compared with setting a water-cooled plate structure, the area for heat exchange between the shell 11 and water is larger, and the heat dissipation effect is better; compared with air cooling, water cooling has better heat dissipation capacity. At the same time, the conical shell 11 has better structural strength and is not easy to deform.

[0039] like Figure 1 and Figure 2 As shown, the housing 11 is conical, one end of the housing 11 is a tip, and the other end is the light outlet 112; a plurality of laser chips 12 are mounted on the inner wall of the housing 11, and the plurality of laser chips 12 are arranged at intervals and arranged in a spiral shape. The reflector is disposed in the accommodating cavity 111, and the reflector is used to reflect the light beam emitted by the corresponding laser chip 12 out of the light outlet 112, and the transmission direction of the reflected light beam is parallel to the axis of the housing 11.

[0040] In the present application, multiple laser chips 12 are distributed in a spiral shape on the inner wall of the conical shell 11, and the light beam emitted by each laser chip 12 is reflected by the reflector to a direction parallel to the axis of the shell 11 and emitted toward the light outlet 112. The end face of the shell 11 located at the light outlet 112 is a planar structure, and the plane where the light outlet 112 is located is the light outlet surface. The axis of the shell 11 is perpendicular to the light outlet surface. Figure 6 As shown, the projection of the light spot formed by the light beams emitted by all the laser chips 12 on the light-emitting surface is spiral. The conical housing 11 has better structural strength.

[0041] It should be noted that the shape of the shell 11 described in the present application is not limited to a conical shape, and can also be a cylindrical, rectangular or other irregular shape. As long as a housing cavity 111 for accommodating the laser chip 12 and the reflector is formed inside the shell 11, the design concept of the present invention can be realized; at the same time, the arrangement form of the multiple laser chips 12 arranged in the shell 11 is not limited to a spiral shape. As long as the light beam reflected by the laser chip 12 through the corresponding reflector is arranged into a spiral light spot on the light output surface of the light output port 112, the design concept of the present invention can be realized and should fall within the protection scope of the present invention.

[0042] like Figure 1 and Figure 2As shown, the number of laser chips 12 arranged near the light outlet 112 on the inner wall of the shell 11 is greater than the number of laser chips 12 arranged near the tip; in the present application, the number of laser chips 12 arranged near the light outlet 112 is greater, that is, the closer the light source is to the light outlet surface, the greater the energy of the light spot converged on the light outlet 112, and the light intensity is better, so the output power of the laser 1 is greater. Preferably, in the present application, from the tip of the shell 11 to the light outlet 112 of the shell 11, multiple laser chips 12 are arranged in a spiral shape, and the number of laser chips 12 increases successively. Of course, in the present application, it can also be that the number of laser chips 12 arranged near the light outlet 112 of the shell 11 is the largest, the number in the middle of the shell 11 is the smallest, and the number of laser chips 12 arranged at the tip of the shell 11 is greater than the number of laser chips 12 arranged in the middle of the shell 11 (that is, between the tip and the light outlet 112).

[0043] According to one embodiment of the present invention, Figure 2 and Figure 4 As shown, the accommodating cavity 111 is also provided with a number of fixing mechanisms corresponding to the number of the reflectors, and the multiple reflectors are respectively arranged on the fixing mechanisms. In the present application, by setting the fixing mechanisms, the reflectors can be installed more conveniently, and the assembly and production of the laser 1 is more convenient.

[0044] like Figure 2 and Figure 4 As shown, in this embodiment, the fixing mechanism includes a fixing column 114, the axis of the fixing column 114 coincides with the axis of the shell 11, and the reflective element includes a reflector 17; the light beam emitted by the laser chip 12 is perpendicular to the axis of the shell 11, and the angle between the axis of the shell 11 and the plane where the reflector 17 is located is 45°. In this embodiment, the fixed column 114 is cylindrical, and one end of the fixed column 114 is connected to the inner wall of the tip of the shell 11. It can be fixed by welding, clamping, riveting, bonding, etc. The axis of the fixed column 114 coincides with the axis of the shell 11; and the reflective member is a reflector 17, the light beam emitted by the laser chip 12 is perpendicular to the axis of the shell 11, and the angle between the axis of the shell 11 and the plane where the reflector 17 is located is 45°, that is, the reflector 17 is tilted 45°, the light beam emitted by the laser chip 12 is irradiated onto the reflector 17, and the reflector 17 reflects the light beam by 45°, that is, the light beam perpendicular to the axis of the fixed column 114 is reflected to be parallel to the axis of the fixed column 114, and the light beam is transmitted in the direction of the light outlet 112.

[0045] It should be noted that the fixing mechanism described in this embodiment is not limited to the fixed column 114, and the fixed column 114 is not limited to a cylindrical shape. For example, the fixed column 114 can be a rectangular strip structure. As long as the reflector 17 can be fixed on the fixed column 114, the design concept of the present invention can be realized; at the same time, the light beam emitted by the laser chip 12 is not limited to the direction perpendicular to the axis of the fixed column 114, and the angle between the reflector 17 and the fixed column 114 is not limited to 45°. As long as the light beam emitted by the laser chip 12 can be reflected by the reflector 17 and can be transmitted in a direction parallel to the axis of the shell 11 toward the light outlet 112, the design concept of the present invention can be realized and should fall within the protection scope of the present invention.

[0046] According to one embodiment of the present invention, Figure 4 As shown, the fixing mechanism further includes a fixing seat 1141 corresponding to the reflector one by one, the fixing seat 1141 is fixed to the outer wall surface of the fixing column 114, and the reflector 17 is arranged on the fixing seat 1141. By providing the fixing seat 1141, the reflector 17 can be fixed more stably, thereby ensuring that the angle between the axis of the fixing column 114 and the plane where the reflector 17 is located is stably maintained at 45°, ensuring that the direction of the light beam emitted from the light outlet 112 is parallel to the axis of the housing 11, that is, ensuring that the light beam is perpendicular to the light outlet surface.

[0047] According to one embodiment of the present invention, Figures 1 to 3 As shown, the laser 1 also includes a mounting seat 113 corresponding to the laser chip 12, and the mounting seat 113 is fixed on the inner wall of the shell 11, and the laser chip 12 is fixed on the corresponding mounting seat 113; since the inner wall of the shell 11 is a smooth curved surface structure, it is not easy to directly fix the laser chip 12 to the inner wall of the shell 11, and the firmness of the laser chip 12 cannot be guaranteed. At the same time, if the laser chip 12 is directly fixed on the inner wall of the shell 11, the angle of the laser chip 12 cannot be guaranteed, and the light emitting direction of the laser chip 12 is easily offset. Therefore, in this application, a mounting seat 113 corresponding to the laser chip 12 is fixed on the inner wall of the shell 11, and the laser chip 12 is fixed on the mounting seat 113. The mounting seat 113 can be fixed to the inner wall of the shell 11 by welding, bonding, clamping, etc., and the laser chip 12 is fixed more stably and conveniently.

[0048] Preferably, Figures 1 to 3As shown, a mounting surface 1131 is formed on the mounting seat 113, and the axis of the housing 11 is perpendicular to the plane where the mounting surface 1131 is located; the laser chip 12 is in the form of a sheet, and the sheet-shaped laser chip 12 is stacked and fixed on the mounting surface 1131. In the present application, a flat mounting surface 1131 is formed on the mounting seat 113, and the laser chip 12 is fixed on the mounting surface 1131, and the fixation is more secure. At the same time, the axis of the housing 11 is perpendicular to the plane where the mounting surface 1131 is located. When the sheet-shaped laser chip 12 is stacked on the mounting surface 1131, when the light beam emitted by the sheet-shaped laser chip 12 is irradiated to the reflector 17 inclined at an angle of 45° to the axis of the housing 11, the light beam can be reflected by the reflector 17 to be parallel to the axis of the housing 11 and transmitted toward the light outlet 112.

[0049] According to one embodiment of the present invention, Figure 3 As shown, the laser also includes a sheet-shaped heat sink 13, which is arranged at the bottom of the laser chip 12 and fixed on the mounting surface 1131. In the present application, the laser chip 12, the heat sink 13 and the mounting surface 1131 are stacked in sequence, and the heat sink 13 is fixed to the mounting seat 113 by welding. The laser chip 12 is fixed to the heat sink 13 by welding. Optionally, in the present application, a plurality of the laser chips 12 are connected in series through metal wires, for example, a plurality of the laser chips 12 are connected in series through copper wires, aluminum wires or gold wires, and an insulating layer is provided on the outside of the metal wire, or an insulating material is provided between the insulating wire and the inner wall of the housing 11 to prevent the laser chip 12 from short-circuiting.

[0050] According to one embodiment of the present invention, Figure 3 and Figure 4 As shown, the laser 1 also includes a fast-axis collimator 14 and a slow-axis collimator 15, and the fast-axis collimator 14 and the slow-axis collimator 15 are sequentially arranged between the laser chip 12 and the reflector. The laser emitted by the laser chip 12 passes through the fast-axis collimator 14 and the slow-axis collimator 15 in sequence, and then is reflected by the reflector. The light beam emitted by the laser chip 12 is compressed by the fast-axis collimator 14 and the slow-axis collimator 15 in sequence, and then reflected out of the light outlet 112 by the reflector 17, wherein the fast-axis collimator 14 is fixed on the mounting seat 113, and the slow-axis collimator 15 is fixed on the fixing seat 1141, and the upper surface of the fixing seat 1141 is a planar structure, and the plane of the fixing seat 1141 is parallel to the mounting surface 1131 or the plane of the fixing seat 1141 is in the same plane as the mounting surface 1131.

[0051] According to one embodiment of the present invention, Figure 1 and Figure 2As shown, the laser 1 also includes a focusing mirror 16 and a transmission optical fiber 18. The focusing mirror 16 is arranged between the light outlet 112 and the transmission optical fiber 18, and is used to focus the light beams emitted by the multiple laser chips 12 and introduce them into the transmission optical fiber 18; wherein the focusing mirror 16 is arranged at intervals between the light outlet surface corresponding to the light outlet 112, and the focusing mirror 16 is parallel to the light outlet surface, and the light beams reflected by the multiple laser chips 12 through the corresponding reflectors 17 are focused by the focusing mirror 16, so that the focused light spot is a spiral light spot adapted to the aperture of the transmission optical fiber 18.

[0052] In the description of the present invention, it should be noted that the terms "upper", "lower", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0053] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the inside of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances. In addition, in the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0054] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A laser, characterized in that: It comprises a housing (11), a plurality of laser chips (12), and reflective elements corresponding one to each of the laser chips (12); A receiving cavity (111) with an open end is formed in the housing (11), the open end of the housing (11) being a light outlet (112), and the plurality of laser chips (12) and the plurality of reflective elements are all installed in the receiving cavity (111); The reflective element is used to reflect the light beam emitted by the corresponding laser chip (12) out of the light outlet (112); The plurality of reflectors are distributed in a spiral shape within the housing (11), so that the projections of the plurality of beams of light reflected by the plurality of laser chips (12) through the corresponding reflectors on the plane where the light outlet is located are arranged in a spiral shape; The outer wall surface of the shell (11) can be directly placed in water to dissipate heat.

2. The laser according to claim 1, characterized in that The shell (11) is in a conical shape, one end of the shell (11) is a tip, and the other end is the light outlet (112); The plurality of laser chips (12) are mounted on the inner wall of the housing (11), and the plurality of laser chips (12) are spaced apart and arranged in a spiral shape.

3. The laser according to claim 2, characterized in that The number of laser chips (12) arranged on the inner wall of the housing (11) close to the light outlet (112) is greater than the number of laser chips (12) arranged close to the tip.

4. The laser according to claim 1, characterized in that The accommodating cavity (111) is also provided with a number of fixing mechanisms corresponding to the number of the reflective elements, and the plurality of reflective elements are respectively arranged on the fixing mechanisms.

5. The laser according to claim 4, characterized in that The fixing mechanism comprises a fixing column (114), the axis of the fixing column (114) coincides with the axis of the housing (11), the reflective element comprises a reflector (17), and the angle between the axis of the housing (11) and the reflection plane of the reflector (17) is 45°; The light beam emitted by the laser chip (12) is perpendicular to the axis of the housing (11), and the transmission direction of the light beam reflected by the reflector (17) is parallel to the axis of the housing (11).

6. The laser according to claim 5, characterized in that The fixing mechanism also includes a fixing seat (1141) corresponding one-to-one to the reflective element, the fixing seat (1141) being fixed to the outer wall surface of the fixing column (114), and the reflecting mirror (17) being arranged on the corresponding fixing seat (1141).

7. The laser according to any one of claims 1 to 6, characterized in that: The laser also includes a mounting seat (113) corresponding one-to-one to the laser chip (12), the mounting seat (113) being fixed on the inner wall of the housing (11), and the laser chip (12) being fixed on the corresponding mounting seat (113).

8. The laser according to claim 7, characterized in that A mounting surface (1131) is formed on the mounting seat (113), and the axis of the housing (11) is perpendicular to the plane where the mounting surface (1131) is located; The laser also includes a sheet-shaped heat sink (13), which is arranged at the bottom of the laser chip (12) and fixed on the mounting surface (1131).

9. The laser according to any one of claims 1 to 6, characterized in that: The laser further comprises a fast axis collimator (14) and a slow axis collimator (15), wherein the fast axis collimator (14) and the slow axis collimator (15) are arranged in sequence between the laser chip (12) and the reflector; The laser light emitted by the laser chip (12) passes through the fast axis collimator (14), the slow axis collimator (15) in sequence, and is then reflected by the reflector.

10. The laser according to any one of claims 1 to 5, characterized in that: The laser also comprises a focusing mirror (16) and a transmission optical fiber (18); the focusing mirror (16) is arranged between the light outlet (112) and the transmission optical fiber (18); the focusing mirror (16) is used to gather light beams reflected by the plurality of reflective elements and guide them into the transmission optical fiber (18).

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