Line light source generating device

Abstract

The present application discloses a line light source generating device, which relates to the field of laser equipment technology. The line light source generating device includes a vertical cavity surface emitting laser light source and a light guide column, the two ends of the light guide column respectively have an incident end face and a reflective end face, the outer peripheral surface of the light guide column includes a reflective side surface and a light emitting side surface, and the incident end face and the reflective end face are both inclined to the axis of the light guide column. By tilting the incident end face of the light guide column, the light beam emitted by the vertical cavity surface emitting laser light source is refracted when entering the light guide column from the incident end face, and the light in the light guide column has a more complex and tortuous propagation path, which can improve the light uniformity of the light emitting side surface, reduce dark areas and bright spots; and can reduce light loss and improve light output power.

Description

Technical Field

[0001] The present application relates to the technical field of laser equipment, and in particular to a linear light source generating device. Background Art

[0002] The line light source generating device in the related art includes a laser and a light guide column. The light emitted by the laser enters the light guide column from one end of the light guide column. When the light propagates in the light guide column, it is emitted from a set area on the side (a strip area along the length direction of the light guide column) to form a line light source. The line light source generating device in the related art has an uneven light distribution along the length direction of the light guide column and a low light output power. Summary of the invention

[0003] The purpose of the present application includes providing a linear light source generating device which can improve light output power and has higher light output uniformity.

[0004] The embodiments of the present application can be implemented as follows:

[0005] The present application provides a line light source generating device, including a vertical cavity surface emitting laser light source and a light guide column, wherein the two ends of the light guide column respectively have an incident end face and a reflective end face, the outer peripheral surface of the light guide column includes a reflective side face and a light emitting side face, the light emitting side face is a strip plane and the extension direction is parallel to the axis of the light guide column, the incident end face and the reflective end face are both inclined to the axis of the light guide column, the reflective side face and the reflective end face are both coated with a reflective film, the far-field distribution of the vertical cavity surface emitting laser light source is a fundamental mode, and the vertical cavity surface emitting laser light source is used to emit a light beam to the incident end face.

[0006] In an optional implementation, the inclination angles of the incident end face and the reflective end face relative to the axis of the light guide column are 15° to 35°.

[0007] In an optional embodiment, the inclination angle of the incident end face relative to the axis of the light guide column is greater than the inclination angle of the reflective end face relative to the axis of the light guide column.

[0008] In an optional embodiment, the incident end face has a gradual inclination angle relative to the axis of the light guide column along the side close to the light emitting side face to the side away from the light emitting side face; and / or the reflective end face has a gradual inclination angle relative to the axis of the light guide column along the side close to the light emitting side face to the side away from the light emitting side face.

[0009] In an optional embodiment, the incident end face includes at least two incident sub-planes connected in sequence, each incident sub-plane is inclined relative to the axis of the light guide column, and each incident sub-plane is arranged from a side close to the light emitting side surface to a side away from the light emitting side surface;

[0010] The reflective end surface includes at least two reflective sub-planes connected in sequence, each reflective sub-plane is inclined relative to the axis of the light guide column, and each reflective sub-plane is arranged from a side close to the light emitting side surface to a side away from the light emitting side surface.

[0011] In an optional implementation, both the incident end face and the reflective end face are arc surfaces, and the tangent planes of any points on the incident end face and the reflective end face are inclined relative to the axis of the light guide column.

[0012] In an optional embodiment, the reflective side surface includes a reflective cylindrical surface and two inner concave surfaces, and the two inner concave surfaces are respectively connected to two sides of the reflective cylindrical surface in the circumferential direction and are connected to the light emitting side surface.

[0013] In an optional embodiment, the profile of the inner concave surface in a cross section perpendicular to the axis of the light guide column is a parabola.

[0014] In an optional embodiment, the light-emitting side surface is a rectangular strip plane, and the width of the light-emitting side surface is 0.5-5 mm;

[0015] The scattering function of the light-emitting side is 0.5~0.995.

[0016] In an optional embodiment, the angle between the incident end face and the light emitting side face is an obtuse angle, and the angle between the reflective end face and the light emitting side face is an acute angle.

[0017] In an optional embodiment, both the light emitting side surface and the incident end surface are coated with an anti-reflection film.

[0018] In an optional embodiment, the wavelength of the light beam emitted by the laser is 700-1310 nm, and the far-field divergence angle is 8°-25°.

[0019] The beneficial effects of the line light source generating device provided by the embodiment of the present application include:

[0020] The line light source generating device provided by the embodiment of the present application includes a vertical cavity surface emitting laser light source and a light guide column, the two ends of the light guide column respectively have an incident end face and a reflective end face, the outer peripheral surface of the light guide column is composed of a reflective side face and a light emitting side face, the light emitting side face is a strip plane and the extension direction is parallel to the axis of the light guide column, the incident end face and the reflective end face are both inclined to the axis of the light guide column, the reflective side face and the reflective end face are both coated with a reflective film, the far-field distribution of the vertical cavity surface emitting laser light source is a fundamental mode mode, and the vertical cavity surface emitting laser light source is used to emit a light beam to the incident end face. By tilting the incident end face of the light guide column, the light beam emitted by the vertical cavity surface emitting laser light source is refracted when entering the light guide column from the incident end face, and the light in the light guide column has a more complex and tortuous propagation path, which can improve the light uniformity of the light emitting side face and reduce dark areas and bright spots. Moreover, the incident end face and the reflection end face are inclined relative to the axis of the light guide column, which can reduce the return light, that is, reduce the light from the incident end face directly reaching the reflection end face, and reflecting back to the incident end face and emitting from the light guide column from the incident end face. Therefore, the linear light source generating device provided by the embodiment of the present application can reduce light loss and improve light output power. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1 This is a schematic diagram of a line light source generating device in one embodiment of the present application;

[0023] Figure 2 This is a schematic diagram of a light guide column in an embodiment of the present application at a first viewing angle;

[0024] Figure 3 This is a schematic diagram of a light guide column in an embodiment of the present application at a second viewing angle;

[0025] Figure 4 A schematic diagram of a light guide column in another embodiment of the present application;

[0026] Figure 5 For this application Figure 4 An axial view of the light guide column in the embodiment;

[0027] Figure 6 A schematic diagram of a light guide column in another embodiment of the present application;

[0028] Figure 7 This is an axial view of a light guide column in another embodiment of the present application;

[0029] Figure 8 This is an axial view of a light guide column in another embodiment of the present application.

[0030] Icon: 100 - vertical cavity surface emitting laser light source; 200 - light guiding column; 210 - incident end face; 211 - incident sub-plane; 220 - reflection end face; 221 - reflection sub-plane; 230 - reflection side face; 231 - reflection cylindrical surface; 232 - inner concave surface; 240 - light emitting side face. DETAILED DESCRIPTION

[0031] In the related art, the incident end face on the light guide column of the linear light source generating device is perpendicular to the axis of the light guide column. The laser enters the light guide column from the incident end face along the axis of the light guide column, and is output from the light emitting side of the light guide column to form a linear light source. Since the laser is almost perpendicular to the incident end face, after entering the light guide column, the light is mostly transmitted along the axial direction of the light guide column, and the path is single, resulting in uneven light distribution on the light emitting side, which is prone to dark areas or light spots. In addition, the end face at the far end of the light guide column (i.e., the end face away from the laser) easily reflects the light back to the incident end face, causing the light to be lost when it exits the light guide column. Therefore, the light output power of the existing linear light source generating device is insufficient.

[0032] To this end, an embodiment of the present application provides a line light source generating device, which improves the light uniformity of the light emitting side, reduces light loss, and improves the light output power by setting the incident end face and the reflection end face to be inclined to the axis of the light guide column.

[0033] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present application.

[0035] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0036] In the description of the present application, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear to indicate an orientation or position relationship, it is based on the orientation or position relationship shown in the drawings, or is the orientation or position relationship in which the product of the invention is usually placed when used. It is only for the convenience of describing the present application and simplifying the description, and does not indicate or imply 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 a limitation on the present application.

[0037] In addition, the terms “first”, “second”, etc., if used, are merely used to distinguish between the descriptions and should not be understood as indicating or implying relative importance.

[0038] It should be noted that, in the absence of conflict, the features in the embodiments of the present application may be combined with each other.

[0039] Figure 1 Schematic diagram of a linear light source generating device in one embodiment of the present application. Figure 1 As shown, the line light source generating device provided in the embodiment of the present application includes a vertical cavity surface emitting laser light source 100 and a light guide column 200. The vertical cavity surface emitting laser light source 100 is used to input a light beam into the light guide column 200 and emit a linear light beam outward through the side of the light guide column 200, thereby forming a line light source.

[0040] Vertical-Cavity Surface-Emitting Laser (VCSEL) is an important semiconductor laser with the advantages of low threshold current, high efficiency, circular beam, easy integration and temperature stability. Optionally, the wavelength of the light beam emitted by the vertical-cavity surface-emitting laser light source 100 is 700~1310nm, and the far-field divergence angle is 8°~25°. Optionally, the near-field distribution of the vertical-cavity surface-emitting laser light source 100 is a rectangular point light source array, and the far-field distribution is approximately circular. In an embodiment of the present application, the far-field distribution of the vertical-cavity surface-emitting laser light source 100 is a fundamental mode mode, which can provide better beam quality and a smaller divergence angle, is not easily affected by external interference, and can maintain stable output during long-term operation.

[0041] Figure 2 This is a schematic diagram of a light guide column 200 in an embodiment of the present application at a first viewing angle; Figure 3 FIG. 2 is a schematic diagram of a light guide column 200 in a second viewing angle in an embodiment of the present application. Figure 2 and Figure 3As shown, in the embodiment of the present application, the two ends of the light guide column 200 respectively have an incident end face 210 and a reflective end face 220, and the outer peripheral surface of the light guide column 200 includes a reflective side face 230 and a light emitting side face 240, and the reflective side face 230 and the light emitting side face 240 are arranged in the circumferential direction of the light guide column 200, and the incident end face 210 and the reflective end face 220 are both inclined to the axis of the light guide column 200, and the reflective side face 230 and the reflective end face 220 are both coated with a reflective film (such as a total reflection dielectric film). The vertical cavity surface emitting laser light source 100 is used to emit a light beam to the incident end face 210. When the light beam emitted by the vertical cavity surface emitting laser light source 100 enters the light guide column 200 from the incident end face 210, since the reflective side face 230 and the reflective end face 220 are both coated with a reflective film, the light in the light guide column 200 is finally output from the light emitting side face 240 after being reflected by the reflective side face 230 and the reflective end face 220 (such as a total reflection dielectric film). Figure 1 As shown by the middle arrow). Since the light-emitting side surface 240 is a strip-shaped surface extending along the axis direction of the light-guiding column 200, the spot shape of the light beam emitted from the light-emitting side surface 240 is a strip-shaped light source, that is, a line light source is formed.

[0042] In this embodiment, the material of the light guide column 200 may be glass, and its refractive index may be 1.3-2.

[0043] In the embodiment of the present application, the light beam emitted by the vertical cavity surface emitting laser light source 100 enters the light guide column 200 along the axial direction of the light guide column 200, that is, the inclination angle α of the incident end face 210 relative to the axis of the light guide column 200 is complementary to the incident angle of the incident light on the incident end face 210 (that is, the sum is 90°). When the light beam emitted by the vertical cavity surface emitting laser light source 100 enters the light guide column 200 from the incident end face 210, it is refracted. Therefore, after entering the light guide column 200, the light is deflected relative to the axis of the light guide column 200, and the light is reflected back and forth between the reflective side surface 230 and the reflective end surface 220. The path becomes relatively tortuous and complex, so the uniformity of the light emitted from the light emitting side surface 240 can be improved. At the same time, the amount of light reflected from the reflective end face 220 and returned to the incident end face 210 can be reduced (this part of the light is easily emitted from the incident end face 210), thereby reducing the return light, reducing the light loss, and thus improving the light output power.

[0044] Optionally, the inclination angle α of the incident end face 210 relative to the axis of the light guide column 200 and the inclination angle β of the reflective end face 220 relative to the axis of the light guide column 200 are in the range of 15° to 35°. In this embodiment, the inclination angles of the incident end face 210 and the reflective end face 220 relative to the axis of the light guide column 200 refer to the acute angles formed by the incident end face 210 and the reflective end face 220 and the axis of the light guide column 200.

[0045] In this embodiment, the light-emitting side surface 240 is a rectangular strip plane extending along the axial direction of the light-guiding column 200, and the width of the light-emitting side surface 240 is 0.5-5 mm. Furthermore, the length of the entire light-guiding column 200 can be 5-100 mm, and the diameter can be 1-10 mm; the length of the light-emitting side surface 240 is equivalent to the length of the light-guiding column 200, that is, it can also be 5-100 mm.

[0046] In the present embodiment, the light emitting side surface 240 is subjected to scattering treatment, and its scattering function is 0.5~0.995. When constructing the scattering function relationship of the light emitting side surface 240, it is necessary to first define the scattering model. The present application embodiment uses Lambert scattering as the basic model. Assume that the light intensity after scattering from the light emitting side surface 240 is I'. From Lambert's cosine law, it can be known that I'=Icosθ, where I is the normal light intensity of the scattering surface, and θ is the incident angle of the light. When considering the absorption of energy by the material of the light guide column 200, it is necessary to introduce the Lambert-Beer definition, that is, A=KBC, where A is the absorbance, C is the absorption concentration of the light guide column 200, B is the absorption thickness (the B and C values ​​are detected and determined by the material of the light guide column 200), and K is the molar absorption coefficient, which is related to the incident wavelength λ, which can be expressed as K(λ); the absorbance A can also be defined as A=log 10 (I / I'), which is the incident light intensity and the outgoing light intensity in the cosine law. That is, A=log 10 (I / I')=K(λ)BC, that is, I'=I / 10 A =I / 10 K(λ)BC ; Let the surface scattering function be F, which represents the random amount of light scattering and is a probability function, then I'F=I / 10 A =I / 10 K(λ)BC This formula theoretically reflects the relationship between wavelength, scattered light intensity, incident surface and surface scattering function.

[0047] By grinding the light-emitting side surface 240, the approximate surface grit number of the light-emitting side surface 240 can be 100-300 meshes. The size of the particles on the light-emitting side surface 240 will affect the scattering angle distribution. In order to improve the uniformity of light, the particle size can be set as needed so that the scattering angle distribution covers the required range.

[0048] In this embodiment, the angle between the incident end face 210 and the light emitting side face 240 is an obtuse angle, and the angle between the reflective end face 220 and the light emitting side face 240 is an acute angle; that is, the inclination directions of the incident end face 210 and the reflective end face 220 are consistent, the outward normal vector of the incident end face 210 is inclined in the direction of the light emitting side face 240, and the outward normal vector of the reflective end face 220 is inclined in the direction away from the light emitting side face 240, which is conducive to reflecting light to the light emitting side face 240.

[0049] In order to increase the amount of light passing through the incident end face 210 and the light emitting side face 240, an anti-reflection film is coated on the light emitting side face 240 and the incident end face 210. It should be understood that the type of anti-reflection film depends on the wavelength of the emitted light, which can increase the transmission rate of light of the corresponding wavelength.

[0050] Optionally, the inclination angle α of the incident end face 210 relative to the axis of the light guide column 200 is greater than the inclination angle β of the reflective end face 220 relative to the axis of the light guide column 200. The difference in inclination angles between the incident end face 210 and the reflective end face 220 can lead to the diversity of light propagation paths: different inclination angles make the reflection path of the light in the light guide column 200 more complex and diverse, which helps to distribute the light more evenly in the light guide column 200, reduce the generation of light spots or dark areas, improve the uniformity and brightness of the light output, and reduce light loss. The difference in the inclination angle ɑ of the incident end face 210 and the inclination angle β of the reflective end face 220 also reduces the loss of the light overflowing from the original incident surface after the original path is reflected (the principle of light reversibility). In addition, the inclination angle ɑ of the incident end face 210 is greater than the inclination angle β of the reflective end face 220, which is more conducive to the reflection of the light to the light output side 240 and reduces the reflection loss. Optionally, the inclination angle ɑ of the incident end surface 210 and the inclination angle β of the reflection end surface 220 satisfy 15°≤β<ɑ≤35°.

[0051] In an optional embodiment, the incident end face 210 has a gradually changing inclination angle relative to the axis of the light guide column 200 from the side close to the light emitting side face 240 to the side away from the light emitting side face 240; and / or, the reflective end face 220 has a gradually changing inclination angle relative to the axis of the light guide column 200 from the side close to the light emitting side face 240 to the side away from the light emitting side face 240. By setting the inclination angles of the incident end face 210 and the reflective end face 220 to be gradually changing, the light path can be made more diversified, and the uniformity of the light output can be further improved. Figure 4 This is a schematic diagram of a light guide column 200 in another embodiment of the present application; Figure 5 For this application Figure 4 An axial view of the light guide column 200 in the embodiment. Figure 4 and Figure 5 As shown, the incident end face 210 includes at least two incident sub-planes 211 connected in sequence, each incident sub-plane 211 is inclined relative to the axis of the light guide column 200, and each incident sub-plane 211 is arranged along the side close to the light emitting side surface 240 to the side away from the light emitting side surface 240; the reflective end face 220 includes at least two reflective sub-planes 221 connected in sequence, each reflective sub-plane 221 is inclined relative to the axis of the light guide column 200, and each reflective sub-plane 221 is arranged along the side close to the light emitting side surface 240 to the side away from the light emitting side surface 240. Specifically, Figure 4 , Figure 5In the embodiment, the incident end face 210 includes three incident sub-planes 211, and the exit end face includes three exit sub-planes. Optionally, the inclination angle of each incident sub-plane 211 of the incident end face 210 relative to the axis of the light guide column 200 is smaller than the inclination angle of any reflective sub-plane 221 of the reflective end face 220 relative to the axis of the light guide column 200.

[0052] Figure 6 FIG. 2 is a schematic diagram of a light guide column 200 in another embodiment of the present application. Figure 6 As shown, optionally, the incident end face 210 and the reflective end face 220 are both arc surfaces, and the tangent planes of any point on the incident end face 210 and the reflective end face 220 are inclined relative to the axis of the light guide column 200. In this way, the incident end face 210 and the reflective end face 220 can also have a gradual inclination angle relative to the axis of the light guide column 200. Specifically, the incident end face 210 and the reflective end face 220 can be a convex cylindrical surface, a concave cylindrical surface, a convex spherical surface, or a concave spherical surface.

[0053] Figure 7 FIG. 2 is an axial view of a light guide column 200 in another embodiment of the present application. Figure 7 As shown, in an optional embodiment, the reflective side surface 230 may include a reflective cylindrical surface 231 and two inner concave surfaces 232, and the two inner concave surfaces 232 are respectively connected to the two sides of the reflective cylindrical surface 231 in the circumferential direction and are connected to the light-emitting side surface 240. By providing two inner concave surfaces 232, the light-emitting side surface 240 is located at the top of the convex structure. The two inner concave surfaces 232 can disperse the light in the light guide column 200 more evenly, reduce the light concentration in a single direction, and thus avoid the generation of hot spots. In addition, the inner concave surface 232 is relatively simple to process, and can be obtained by cutting on the original columnar structure.

[0054] exist Figure 7 In the illustrated embodiment, the profile of the inner concave surface 232 in a cross section perpendicular to the axis of the light guide rod 200 is a parabola. Figure 8 FIG. 2 is an axial view of a light guide column 200 in another embodiment of the present application. Figure 8 As shown, in other embodiments, the inner concave surface 232 may also be formed by two planes that are at an angle (eg, perpendicular). Further, the two inner concave surfaces 232 may be symmetrically disposed on both sides of the light emitting side surface 240 .

[0055] In summary, the embodiment of the present application provides a line light source generating device, which includes a vertical cavity surface emitting laser light source 100 and a light guide column 200, wherein the two ends of the light guide column 200 respectively have an incident end face 210 and a reflective end face 220, and the outer peripheral surface of the light guide column 200 includes a reflective side face 230 and a light emitting side face 240, and the reflective side face 230 and the light emitting side face 240 are arranged in the circumferential direction of the light guide column 200, and the incident end face 210 and the reflective end face 220 are both inclined to the axis of the light guide column 200, and the reflective side face 230 and the reflective end face 220 are both coated with a reflective film. The far-field distribution of the vertical cavity surface emitting laser light source 100 is a fundamental mode mode, and the vertical cavity surface emitting laser light source 100 is used to emit a light beam to the incident end face 210. By tilting the incident end face 210 of the light guide column 200, the light beam emitted by the vertical cavity surface emitting laser light source 100 is refracted when entering the light guide column 200 from the incident end face 210, and the light in the light guide column 200 has a more complex and tortuous propagation path, which can improve the light uniformity of the light output side 240 and reduce dark areas and bright spots. In addition, the incident end face 210 and the reflective end face 220 are tilted compared to the axis of the light guide column 200, which can reduce the return light, that is, reduce the light from the incident end face 210 After being incident, it directly reaches the reflective end face 220, and is reflected back to the incident end face 210 and emitted from the light guide column 200 from the incident end face 210. Therefore, the linear light source generation device provided in the embodiment of the present application can reduce light loss and improve light output power.

[0056] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by any technician familiar with the technical field within the technical scope disclosed in the present application should be included in the protection scope of the present application.

Claims

1. A linear light source generating device, characterized in that: It comprises a vertical cavity surface emitting laser light source (100) and a light guide column (200), wherein the two ends of the light guide column (200) respectively have an incident end face (210) and a reflective end face (220), the outer peripheral surface of the light guide column (200) comprises a reflective side face (230) and a light emitting side face (240), the light emitting side face (240) is a strip-shaped plane and its extension direction is parallel to the axis of the light guide column, the incident end face (210) and the reflective end face (220) are both inclined to the axis of the light guide column (200), the reflective side face (230) and the reflective end face (220) are both coated with a reflective film, the far-field distribution of the vertical cavity surface emitting laser light source (100) is a fundamental mode, and the vertical cavity surface emitting laser light source (100) is used to emit a light beam to the incident end face (210); The reflective side surface (230) comprises a reflective cylindrical surface (231) and two inner concave surfaces (232), wherein the two inner concave surfaces (232) are respectively connected to two sides of the reflective cylindrical surface (231) in the circumferential direction and are connected to the light emitting side surface (240); The included angle between the reflective end surface (220) and the light emitting side surface (240) is an acute angle.

2. The line light source generating device according to claim 1, characterized in that: The inclination angles of the incident end face (210) and the reflective end face (220) relative to the axis of the light guide column (200) are 15° to 35°.

3. The line light source generating device according to claim 1, characterized in that: The inclination angle of the incident end surface (210) relative to the axis of the light guide column (200) is greater than the inclination angle of the reflective end surface (220) relative to the axis of the light guide column (200).

4. The line light source generating device according to claim 1, characterized in that: The incident end surface (210) has a gradually changing inclination angle relative to the axis of the light guide column (200) along a side close to the light emitting side surface (240) toward a side away from the light emitting side surface (240); And / or, along a side close to the light emitting side surface (240) toward a side away from the light emitting side surface (240), the reflective end surface (220) has a gradually changing inclination angle relative to the axis of the light guiding column (200).

5. The line light source generating device according to claim 4, characterized in that: The incident end face (210) comprises at least two incident sub-planes (211) connected in sequence, each of the incident sub-planes (211) is inclined relative to the axis of the light guide column (200), and each of the incident sub-planes (211) is arranged from a side close to the light emitting side surface (240) to a side away from the light emitting side surface (240); The reflective end surface (220) comprises at least two reflective sub-planes (221) connected in sequence, each of the reflective sub-planes (221) is inclined relative to the axis of the light guide column (200), and each of the reflective sub-planes (221) is arranged from a side close to the light emitting side surface (240) to a side away from the light emitting side surface (240).

6. The line light source generating device according to claim 4, characterized in that: The incident end surface (210) and the reflective end surface (220) are both arc surfaces, and the tangent planes of any point on the incident end surface (210) and the reflective end surface (220) are inclined relative to the axis of the light guide column (200).

7. The line light source generating device according to claim 1, characterized in that: The profile of the inner concave surface (232) in a cross section perpendicular to the axis of the light guide column (200) is a parabola.

8. The line light source generating device according to any one of claims 1 to 7, characterized in that: The light-emitting side surface (240) is a rectangular strip-shaped plane, and the width of the light-emitting side surface (240) is 0.5-5 mm; The scattering function of the light-emitting side surface (240) is 0.5-0.

995.

9. The line light source generating device according to any one of claims 1 to 7, characterized in that: The included angle between the incident end face (210) and the light emitting side face (240) is an obtuse angle.

10. The line light source generating device according to any one of claims 1 to 7, characterized in that: The light-emitting side surface (240) and the incident end surface (210) are both coated with an anti-reflection film.

11. The line light source generating device according to any one of claims 1 to 7, characterized in that: The wavelength of the light beam emitted by the vertical cavity surface emitting laser light source (100) is 700-1310 nm, and the far-field divergence angle is 8°-25°.

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