A prism laser scanner

Abstract

The utility model discloses a prism formula laser scanner, including laser light source and light receiver, its characterized in that, laser light source and light receiver between along optical path are sequentially arranged collimating lens, laser deflection device, half -and -half lens and camera lens group, laser deflection device includes oppositely arranged wedge prism I and wedge prism II, wedge prism I and wedge prism II are adjusted distance through linear moving assembly, and all be provided on rotating unit of wedge prism I and wedge prism II to adjust the angle of wedge prism I and wedge prism II. The utility model discloses through linear moving assembly adjustment the interval between wedge prism I and wedge prism II, to realize the scanning range of prism formula laser scanner to expand and reduce the size of the dark area in the middle, through rotating unit realizes the full coverage of scanning angle.

Description

Technical Field

[0001] This utility model belongs to the field of scanner application technology, specifically relating to a prism laser scanner. Background Technology

[0002] A lidar system optically scans a scene using a laser scanner. Here, the laser scanner sends a laser beam at a variable scanning angle along at least one axis into the detection area. The laser beam is reflected off objects within the detection area. Based on the scanning angle and propagation time of the laser beam and its reflection, the lidar system can calculate the distance and orientation to the object.

[0003] On the market, prism laser scanners use a fixed spacing between their two wedge prisms, which results in a persistent dark area in the center of the device. Utility Model Content

[0004] To overcome the shortcomings of the existing technology, the present invention aims to provide a technical solution for a prism laser scanner, which expands the scanning range of the prism laser scanner by using a built-in prism spacing adjustment device to reduce the size of the dark area in the middle.

[0005] The specific technical solution of this utility model is as follows:

[0006] A prism-type laser scanner includes a laser source and a light receiver. The laser source and light receiver are characterized by a collimating lens, a laser deflection device, a semi-reflective lens, and a lens assembly arranged sequentially along the optical path. The laser deflection device includes a wedge prism I and a wedge prism II arranged opposite to each other. The distance between the wedge prism I and the wedge prism II is adjusted by a linear movement component, and both the wedge prism I and the wedge prism II are provided with rotation components to adjust their angles.

[0007] Furthermore, the laser deflection device includes a base plate, on which a linear moving component is disposed. The wedge prism II is disposed at one end of the base plate, and the wedge prism I is disposed on the linear moving component. The distance between the wedge prism I and the wedge prism II is adjusted by driving the wedge prism I on it to move linearly through the linear moving component.

[0008] Furthermore, the linear motion component includes a lead screw, a motor is provided at the end of the lead screw away from the wedge prism II, a slide rail parallel to the lead screw is provided on one side of the lead screw, a slider is slidably provided on the slide rail, and the slider is rotatably engaged with the lead screw, and the wedge prism I is disposed on the slider.

[0009] Furthermore, the rotating component adopts a hollow rotary servo motor, which is connected to a motor drive controller.

[0010] Furthermore, the central axes of the laser source, collimating lens, wedge prism I and wedge prism II, and semi-reflective lens coincide.

[0011] Compared with the prior art, the present invention has the following advantages:

[0012] This invention adjusts the distance between wedge prism I and wedge prism II using a linear moving component to expand the scanning range of the prism laser scanner and reduce the size of the dark area in the middle; and achieves full coverage of the scanning angle through a rotating component. Attached Figure Description

[0013] Figure 1 This is a schematic diagram of the scanner of this utility model;

[0014] Figure 2 This is a schematic diagram of the structure of the laser deflection device of this utility model;

[0015] Figure 3 This is a schematic diagram of the optical path of the scanner of this utility model (close-up view);

[0016] Figure 4 This is a schematic diagram of the optical path of the scanner of this utility model (long distance);

[0017] Figure 5 This is one of the schematic diagrams of the optical path of the scanner of this utility model (minimum angle deflection);

[0018] Figure 6 This is a schematic diagram of the optical path of the scanner of this utility model (maximum angle deflection);

[0019] Figure 7 This is the second schematic diagram of the optical path of the scanner of this utility model (minimum angular deflection).

[0020] In the diagram: 1-Laser source, 2-Collimating lens, 3-Laser deflection device, 31-Wedge prism I, 32-Wedge prism II, 4-Semi-reflective lens, 5-Lens group, 6-Light receiver, 7-Rotating assembly, 8-Linear movement assembly, 81-Lead screw, 82-Motor, 83-Slide rail, 84-Slider, 9-Base plate. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0022] like Figure 1As shown, a prism-type laser scanner includes a laser source 1 and a light receiver 6. The scanner is characterized by a collimating lens 2, a laser deflection device 3, a semi-reflective lens 4, and a lens group 5 sequentially arranged along the optical path between the laser source 1 and the light receiver 6. The laser deflection device 3 includes a wedge prism I 31 and a wedge prism II 32 arranged opposite to each other. The distance between the wedge prism I 31 and the wedge prism II 32 is adjusted by a linear movement component 8. Both the wedge prism I 31 and the wedge prism II 32 are equipped with a rotation component 7 to adjust their angles. In this application, the rotation component 7 is a hollow rotary servo motor connected to a motor driver. The output shaft of the hollow rotary servo motor is connected to the wedge prism I 31 / wedge prism II 32. The motor driver starts the hollow rotary servo motor, driving the wedge prism I 31 / wedge prism II 32 to rotate.

[0023] like Figure 2 As shown, the laser deflection device 3 includes a base plate 9, on which a linear moving assembly 8 is mounted. A wedge prism II 32 is mounted at one end of the base plate 9, and a wedge prism I 31 is mounted on the linear moving assembly 8. The distance between the wedge prism I 31 and the wedge prism II 32 is adjusted by driving the wedge prism I 31 to move linearly via the linear moving assembly 8. The linear moving assembly 8 includes a lead screw 81, with a motor 82 mounted at the end of the lead screw 81 away from the wedge prism II 32. A slide rail 83 parallel to the lead screw 81 is mounted on one side of the lead screw 81, and a slider 84 is slidably mounted on the slide rail 83, rotating in coordination with the lead screw 81. The wedge prism I 31 is mounted on the slider 84.

[0024] It is understandable that the collimating lens 2 is used to collimate the laser; the wedge prism I 31 and wedge prism II 32 are used to rotate around the optical axis to scan the laser spot into various shapes; the semi-reflective lens 4 is used not only to allow the light from the laser source 1 to pass through, but also to reflect the light from the object being measured into the light receiver 6; the lens group 5 is used to focus the laser at the light receiver 6; and the light receiver 6 is used to collect the light spot of the object being measured and to determine the distance and size of the object.

[0025] In this application, the central axes of the laser source 1, collimating lens 2, wedge prism I 31 and wedge prism II 32, and semi-reflective lens 4 coincide. The emission process of the prism-type laser scanner's optical path is as follows: light is emitted from the source 1, sequentially through the collimating lens 2, wedge prism 31, wedge prism 32, and beam splitter 4; the receiving process involves the reflected light from the sample passing through the beam splitter 4, lens group 5, and receiver 6.

[0026] like Figure 3 and Figure 4 The difference is that the spacing between wedge prism I 31 and wedge prism II 32 changes to d1 and d2 respectively, where d1 < d2.

[0027] like Figure 5 The image shows the minimum light output angle of the prism laser scanner's optical path, such as... Figure 6 The image shows the maximum light output angle of the prism laser scanner's optical path.

[0028] Continue reading Figure 5 If the distance of the light spot from the center is W, then the calculation is as follows: According to the law of optical refraction, when the wedge angle of the wedge prism is α, the center thickness is L, the distance between wedge prism I31 and wedge prism II32 is d, the air refractive index is n0, and the wedge prism refractive index is n1, then:

[0029]

[0030] like Figure 7 The diagram shows the minimum output angle of the light path in another prism-type laser scanner. If the distance of the light spot from the center is W, the calculation is as follows: According to the law of optical refraction, when the wedge angle of the wedge prism is α, the center thickness is L, the distance between the two wedge prisms is d, the air refractive index is n0, and the wedge prism refractive index is n1, then:

[0031]

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this utility model.

Claims

1. A prism-type laser scanner, comprising a laser source (1) and a light receiver (6), characterized in that, A collimating lens (2), a laser deflection device (3), a semi-reflective lens (4), and a lens group (5) are sequentially arranged along the optical path between the laser source (1) and the light receiver (6). The laser deflection device (3) includes a wedge prism I (31) and a wedge prism II (32) arranged opposite to each other. The distance between the wedge prism I (31) and the wedge prism II (32) is adjusted by a linear moving component (8). A rotating component (7) is provided on both the wedge prism I (31) and the wedge prism II (32) to adjust the angle of the wedge prism I (31) and the wedge prism II (32).

2. The prism-type laser scanner according to claim 1, characterized in that, The laser deflection device (3) includes a base plate (9), on which a linear moving component (8) is provided. The wedge prism II (32) is located at one end of the base plate (9), and the wedge prism I (31) is located on the linear moving component (8). The wedge prism I (31) is driven to move linearly by the linear moving component (8) to adjust the distance between the wedge prism I (31) and the wedge prism II (32).

3. A prism-type laser scanner according to claim 2, characterized in that, The linear motion component (8) includes a lead screw (81), a motor (82) is provided at the end of the lead screw (81) away from the wedge prism II (32), a slide rail (83) parallel to the lead screw (81) is provided on one side of the lead screw (81), a slider (84) is slidably provided on the slide rail (83), and the slider (84) is rotatably engaged with the lead screw (81), and the wedge prism I (31) is provided on the slider (84).

4. A prism-type laser scanner according to claim 1, characterized in that, The rotating component (7) adopts a hollow rotary servo motor, which is connected to a motor drive controller.

5. A prism-type laser scanner according to claim 2, characterized in that, The central axes of the laser source (1), collimating lens (2), wedge prism I (31), wedge prism II (32), and semi-reflective lens (4) coincide.

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