A line laser module that can improve laser energy utilization

Abstract

This utility model discloses a linear laser module that can improve laser energy utilization. It includes a housing, with a light source fixedly mounted at one end. Inside the housing, along the optical path, a beam expander, a light-shielding hole, an aspherical lens, a Powell prism, and a grating are arranged sequentially. The central axes of the light source, the beam expander, the light-shielding hole, the aspherical lens, the Powell prism, and the grating are all on the same horizontal line. This linear laser module improves laser energy utilization by using the synergistic effect of the beam expander, the light-shielding hole, the aspherical lens, and the Powell prism to perform beam convergence, shaping, and focusing on the laser. This combination significantly reduces transmission loss and can project high-quality laser with uniform energy and good linearity. It features lightweight portability, high energy utilization, and long working distance.

Description

Technical Field

[0001] This utility model relates to the field of laser technology, specifically to a line laser module that can improve laser energy utilization. Background Technology

[0002] Line laser modules for machine vision are characterized by fine linewidth, high resolution, and wide applicability, and can be applied to various 2D and 3D vision applications and inspection systems, such as scanners and profilometers. A search revealed the closest existing design to be a laser module and scanner with application number CN202322925911.2. This laser module includes a line laser module and optical diffraction elements. The line laser module includes a laser diode, a collimating lens, a beam expander, and a Powell prism arranged sequentially along the optical path. The collimating lens includes an aspherical collimating lens with a focal length less than or equal to 2.5 mm. The optical diffraction elements are used to split the laser beam emitted from the line laser module. The end of the line laser module is the end of the Powell prism furthest from the beam expander.

[0003] However, the existing solutions have relatively large internal optical components and assemblies in the laser module, which greatly limits the development of miniaturization and portability of the scanner. In addition, the assembled laser has a depth of field that is smaller than that of the scanner camera. Utility Model Content

[0004] The purpose of this utility model is to provide a line laser module that can improve the utilization rate of laser energy, so as to solve the problem that the existing solutions proposed in the background art have large internal optical components and assemblies, which greatly restricts the development of miniaturization and portability of scanners, and the assembled laser has a depth of field that is smaller than that of the scanner camera.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a line laser module that can improve the utilization rate of laser energy, comprising a light source fixedly installed at one end of a housing, and a beam expander, a light-shielding hole, an aspherical lens, a Powell prism and a grating sheet arranged sequentially along the optical path inside the housing; The central axis of the light source, the central axis of the beam expander, the central axis of the light-shielding hole, the central axis of the aspherical lens, the central axis of the Powell prism, and the central axis of the grating are on the same horizontal line; the overall encapsulation effectively prevents dust, shock, and heat dissipation, extends service life, and improves energy utilization and output stability.

[0006] Preferably, the first surface of the Powell prism is a two-dimensional curved surface, and the second surface of the Powell prism is a plane. The first surface of the Powell prism is the side of the Powell prism closest to the aspherical lens, and the second surface of the Powell prism is the side of the Powell prism furthest from the aspherical lens. The light-blocking aperture effectively filters out stray light, improves energy utilization, and enhances the depth of field to a certain extent. The aspherical lens, in conjunction with the beam expander, improves beam quality and uniformity.

[0007] Preferably, both the aspherical lens and the beam expander are fixedly connected to the inner cavity of the housing.

[0008] Preferably, the beam expander is used to focus the light spot emitted by the light source, and the beam expander can be any optical component with a light-focusing function.

[0009] Preferably, the light-shielding hole is located on the extension line of the central axis of the beam expander, and is used to focus the light spot.

[0010] Preferably, the aspherical lens is used to focus the multi-beam laser after it has been split by the grating plate, and the grating plate is used to split the passing beam; the fixed position ensures that the grating plate is precisely aligned with the optical path, ensuring the quality of beam splitting, and the location inside the connector effectively prevents dust and damage.

[0011] Compared with the prior art, the beneficial effects of this utility model are: the laser module performs beam-contracting, shaping and focusing processing on the laser through the synergistic effect of the beam expander, the light-blocking hole, the aspherical lens and the Powell prism, which increases the working distance of the laser and improves the laser energy utilization rate. This combination significantly reduces transmission loss and can project high-quality laser with uniform energy and good linearity. It has the characteristics of being lightweight and portable, having high energy utilization rate and long working distance. Attached Figure Description

[0012] Figure 1 This is a schematic diagram showing the sequential arrangement of the line laser module along the optical path according to this utility model.

[0013] In the diagram: 1. Grating sheet; 2. Housing; 3. Powell prism; 4. Aspherical lens; 5. Light-blocking aperture; 6. Beam expander; 7. Light source. Detailed Implementation

[0014] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0015] Please see Figure 1This utility model provides a line laser module that can improve the utilization rate of laser energy, including a light source 7 fixedly installed at one end of the housing 2, and a beam expander 6, a light shielding hole 5, an aspherical lens 4, a Powell prism 3 and a grating plate 1 arranged sequentially along the optical path inside the housing 2. The central axis of the light source 7, the central axis of the beam expander 6, the central axis of the light-shielding aperture 5, the central axis of the aspherical lens 4, the central axis of the Powell prism 3, and the central axis of the grating plate 1 are on the same horizontal line. The large-angle light spot emitted by the light source 7 is first focused by the beam expander 6 to improve energy utilization and increase the depth of field to a certain extent. Then, the light spot angle is reduced by the light-shielding aperture 5 to further increase the laser depth of field. Then, the light spot is focused into a small light point by the aspherical lens 4 and hit on the Powell prism 3 to make the light spot into a uniform line. Then, the uniform line is turned into multiple uniform lines by the grating plate 1, which increases the laser working distance and improves the laser energy utilization.

[0016] Furthermore, the first surface of the Powell prism 3 is a two-dimensional curved surface, and the second surface of the Powell prism 3 is a plane. The first surface of the Powell prism 3 is the side closest to the light source 7, and the second surface is the side furthest from the light source 7. The beam expander 6 is used to focus the light spot emitted by the light source 7. The beam expander 6 can be any optical element with focusing function. The beam expander 6 is used to expand the slow axis direction of the linear laser beam after passing through the Powell prism 3. The grating 1 is used to split the laser beam after it has been expanded by the beam expander 6. A multi-beam laser is formed. An aspherical lens 4 is used to focus the multi-beam laser after it has been split by the grating plate 1. The laser module is arranged along the optical path as follows: a light source 7, a Powell prism 3, a beam expander 6, a grating plate 1, an aspherical lens 4, and a light-shielding hole 5. The laser emitted by the light source 8 is formed into a uniform line laser by the Powell prism 3; the beam expander 6 expands the slow axis directionally; the grating plate 1 splits the single line into multiple beams; the aspherical lens 4 focuses the multiple beams synchronously and corrects aberrations; the light-shielding hole 5 filters stray light. All components are fixed to the housing 7 to ensure optical path stability and improve energy utilization and detection accuracy.

[0017] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A linear laser module capable of improving the utilization rate of laser energy, comprising a shell (2), characterized in that: A light source (7) is fixedly installed at one end of the housing (2), and a beam expander (6), a light-blocking hole (5), an aspherical lens (4), a Powell prism (3) and a grating plate (1) are arranged sequentially along the optical path inside the housing (2). The central axis of the light source (7), the central axis of the beam expander (6), the central axis of the light-blocking hole (5), the central axis of the aspherical lens (4), the central axis of the Powell prism (3), and the central axis of the grating (1) are on the same horizontal line.

2. A line laser module with improved laser energy utilization according to claim 1, characterized in that: The first surface of the Powell prism (3) is a two-dimensional curved surface, and the second surface of the Powell prism (3) is a plane. The first surface of the Powell prism (3) is the side of the Powell prism (3) that is close to the aspherical lens (4), and the second surface of the Powell prism (3) is the side of the Powell prism (3) that is away from the aspherical lens (4).

3. A line laser module with improved laser energy utilization according to claim 2, characterized in that: The aspherical lens (4) and the beam expander (6) are both fixedly connected to the inner cavity of the outer shell (2).

4. A line laser module with improved laser energy utilization according to claim 1, characterized in that: The beam expander (6) is used to focus the light spot emitted by the light source (7). The beam expander (6) can be any optical component with focusing function.

5. A line laser module with improved laser energy utilization according to claim 4, characterized in that: The light-blocking hole (5) is located on the extension line of the central axis of the beam expander (6) and is used to focus the light spot.

6. A line laser module with improved laser energy utilization according to claim 5, characterized in that: The aspherical lens (4) is used to focus the multi-beam laser after it has been split by the grating (1), and the grating (1) is used to split the passing beam.

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