A linear laser generator and a three-dimensional measuring device

Abstract

The utility model discloses a kind of linear laser generator and three-dimensional measuring equipment, the linear laser generator includes coaxially arranged laser emission source and collimation homogenization module, the linear laser generator further includes first beam shaping element, the first beam shaping element is arranged between the laser emission source and the collimation homogenization module, and with the laser emission source coaxial arrangement, the first beam shaping element is used to compress the angle of the set direction of the output light ray of the laser emission source. The utility model can improve measurement accuracy and reduce measurement error, and more widely applicable.

Description

Technical Field

[0001] This utility model relates to the field of laser technology, specifically to a line laser generator and a three-dimensional measurement device. Background Technology

[0002] In 3D contour detection equipment, line laser generators are often used to project corresponding light rays onto the object under test, enabling the camera to accurately identify the contour of the object. The quality of the light emitted by the line laser generator directly affects the quality of the detection.

[0003] The detection accuracy and detection error of 3D contour detection equipment in related technologies are poor, and they are not suitable for some high-requirement scenarios. Utility Model Content

[0004] This invention aims to address one of the technical problems in related technologies to a certain extent. To this end, this invention provides a line laser generator and a three-dimensional measuring device, which can improve detection accuracy, reduce detection errors, and broaden the scope of application.

[0005] To achieve the above objectives, the first aspect of this utility model discloses a line laser generator, which includes a laser emission source and a collimation and homogenization module arranged coaxially. The line laser generator also includes a first beam shaping element, which is disposed between the laser emission source and the collimation and homogenization module and is coaxially arranged with the laser emission source. The first beam shaping element is used to compress the angle of the set direction of the output light of the laser emission source.

[0006] In this technical solution, by adding a first beam shaping element between the laser emission source and the collimating lens, the set direction (fast axis direction or slow axis direction) of the output light from the laser emission source can be compressed for the first time. Combined with the compression collimation effect of the collimating lens, the output light can be compressed and collimated twice. According to the actual use requirements, a linear spot with better Gaussianity and smaller linewidth can be obtained, so that the line laser generator meets the requirements of linewidth and Gaussianity within a certain working distance range.

[0007] Furthermore, the laser emission source can rotatably switch between a first position and a second position around its own axis. At the first position, the curved surface direction of the first beam shaping element is consistent with the fast axis direction of the output light from the laser emission source; In the second position, the curved surface direction of the first beam shaping element is consistent with the slow axis direction of the output light from the laser emission source.

[0008] Furthermore, the first beam shaping element includes at least one of an optical fiber rod and a cylindrical lens rod.

[0009] Furthermore, the collimation and homogenization module includes a collimating lens, a first aperture, and a second beam shaping element arranged coaxially along the emission direction of the laser emission source. The second beam shaping element is used to homogenize and shape the light, and the first beam shaping element is disposed between the laser emission source and the collimating lens.

[0010] Furthermore, the second beam shaping element includes a first component, a second component, and a second aperture, with the second aperture disposed between the first component and the second component. The first component includes at least one of an optical fiber rod and a cylindrical lens rod, and the second component includes at least one cylindrical lens.

[0011] Furthermore, light channels are formed on the first aperture and the second aperture respectively. The light channel of the first aperture is opposite to the exit surface of the collimating lens, and the light channel of the second aperture is opposite to the incident surface of the second component.

[0012] Furthermore, the first aperture and the second aperture are made of plastic or metal, respectively.

[0013] Furthermore, the second component includes multiple cylindrical mirrors arranged sequentially along the emission direction of the output light, with the second aperture positioned in front of the last cylindrical mirror.

[0014] Furthermore, the collimating lens is configured as at least one of a spherical and an aspherical mirror.

[0015] Furthermore, the collimating lens includes at least one of a plano-convex lens, a plano-concave lens, and a biconvex lens.

[0016] Furthermore, the laser emission source includes at least one of a side-emitting laser diode, a vertical-cavity surface-emitting laser diode, and a transistor-outline packaged laser diode.

[0017] Furthermore, the wavelength of the light emitted by the laser source is between 200nm and 1100nm.

[0018] The second aspect of this utility model discloses a three-dimensional measuring device, including a body and a line laser generator disposed on the body, wherein the line laser generator is the line laser generator of the first aspect.

[0019] These features and advantages of this utility model will be disclosed in detail in the following specific embodiments and accompanying drawings. The preferred embodiments or means of this utility model will be shown in detail in conjunction with the accompanying drawings, but this is not intended to limit the technical solution of this utility model. In addition, each of these features, elements and components appearing in the following text and drawings is multiple and is labeled with different symbols or numbers for convenience, but all represent parts with the same or similar structure or function. Attached Figure Description

[0020] The present invention will be further described below with reference to the accompanying drawings: Figure 1 This is a schematic diagram of the structure of a line laser generator according to one embodiment of the present invention; Figure 2 This is a schematic diagram of the optical path of a line laser generator according to one embodiment of the present invention; Figure 3 This is a schematic diagram of the optical path of a line laser generator according to one embodiment of the present invention; Figure 4 This is a diagram showing the uniformity distribution of the laser spot in the line laser generator of this invention.

[0021] in, 10. Laser emission source; 20. Collimating lens; 30. First aperture; 40. Second beam shaping element; 41. First component; 42. Second aperture; 43. Second component; 50. First beam shaping element; 60. Working surface. Detailed Implementation

[0022] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described are intended to explain this utility model and should not be construed as limiting it.

[0023] The terms "an embodiment," "example," or "trademark" used in this specification refer to a particular feature, structure, or characteristic described in connection with the embodiment itself that may be included in at least one embodiment disclosed in this utility model. The phrase "in an embodiment" appearing in various places throughout the specification does not necessarily refer to the same embodiment.

[0024] In 3D measurement equipment in related technologies, line laser generators typically use only one collimating lens for spot compression. To obtain a smaller linewidth, the fast axis is usually used as the linewidth direction. However, due to the large difference in angle between the fast and slow axes, the utilization rate of light is low, resulting in problems such as small depth of field and poor Gaussianness, which in turn affects the detection accuracy and detection error of the 3D measurement equipment.

[0025] As one embodiment of this utility model, see the appendix. Figure 1 To be continued Figure 4 A line laser generator is disclosed, comprising a laser emission source 10 and a collimation and homogenization module arranged coaxially. The line laser generator also includes a first beam shaping element 50, which is disposed between the laser emission source 10 and the collimation and homogenization module and is coaxially arranged with the laser emission source 10. The first beam shaping element 50 is used to compress the angle of the set direction of the output light of the laser emission source 10.

[0026] One embodiment of the collimation and homogenization module includes a collimating lens 20, a first aperture 30, and a second beam shaping element 40 arranged coaxially along the emission direction of the laser emission source 10. The second beam shaping element 40 is used to homogenize and shape the light, and the first beam shaping element 50 is disposed between the laser emission source 10 and the collimating lens 20.

[0027] The second beam shaping element 40 is used to homogenize and shape the light. The line laser generator also includes a first beam shaping element 50, which is disposed between the laser emission source 10 and the collimating lens 20 and is coaxially arranged with the laser emission source 10. The first beam shaping element 50 is used to compress the angle of the fast axis direction of the output light of the laser emission source 10 to reduce the angle difference between the fast axis direction and the slow axis direction of the output light of the laser emission source 10.

[0028] The line laser generator in this embodiment is used to convert a point beam into a line spot beam. It is mainly used in 3D measurement equipment and the field of high uniformity line spot detection, which can improve the detection accuracy of 3D measurement equipment and reduce detection errors.

[0029] In this embodiment, the laser emission source 10 is generally a laser diode (LD, a device that generates laser light through stimulated emission). In actual use, the laser emission source 10 can be configured as at least one of edge-emitting laser (EEL), vertical-cavity surface-emitting laser (VCSEL), and transistor outline package laser (TO package).

[0030] See appendix Figure 1In this embodiment, the emitted light from the laser source 10 undergoes initial compression via the first beam shaping element 50. This embodiment does not specify the direction in which the first beam shaping element 50 compresses the emitted light from the laser source 10. In actual implementation, the first beam shaping element 50 can compress either the fast or slow axis of the output light according to actual needs. For example, when higher measurement accuracy is required, the fast axis of the output light can be compressed to improve the Gaussianity of the linear spot and achieve higher measurement accuracy. When a larger working depth of field is required, the slow axis of the output light can be compressed to reduce the linewidth of the spot and thus reduce measurement errors.

[0031] This embodiment does not specifically limit how the first beam shaping element 50 can compress the output light in different directions. In setting, it can be achieved by changing the angle of the laser emission source or the angle of the first beam shaping element.

[0032] In this embodiment, the specific structure of the first beam shaping element 50 is not specifically limited. In actual configuration, the first beam shaping element 50 can be set as at least one of an optical fiber rod and a cylindrical lens rod. For example, it can be set as an optical fiber rod or a cylindrical lens rod alone, or it can be a combination of an optical fiber rod and a cylindrical lens rod, as long as it can achieve compression of the output light.

[0033] In this embodiment, the collimating lens 20 is disposed behind the first beam shaping element 50. The output light is compressed and integrated by the second beam shaping element 40 before reaching the collimating lens 20. The collimating lens 20 can perform a second compression and collimation on the output light. That is, the line laser generator in this embodiment can compress, integrate and focus the output light twice. Then, the focused point light source is uniformly diffused by the second beam shaping element to obtain a uniform linear light spot.

[0034] Line laser generators in related technologies generally improve Gaussianity by changing the structure of the aperture, which causes energy loss of the light and cannot meet the needs of some specific applications.

[0035] In one embodiment of this utility model, the laser emission source 10 is rotatably switchable between a first position and a second position around its own axis. At the first position, the curved surface direction of the first beam shaping element 50 is consistent with the fast axis direction of the output light from the laser emission source 10; In the second position, the curved surface direction of the first beam shaping element 50 is consistent with the slow axis direction of the output light of the laser emission source 10.

[0036] In one embodiment of the present invention, the first beam shaping element 50 includes at least one of an optical fiber rod and a cylindrical lens rod, and the curved surface direction of the first beam shaping element 50 is consistent with the fast axis direction of the light emitted by the laser emission source 10.

[0037] In this embodiment, the first beam shaping element 50 can be configured as a fiber rod (which is easier to process and helps ensure processing quality) or a cylindrical rod, or a combination of both. Of course, other devices capable of compressing fast-axis rays can also be used.

[0038] In actual setup, in this embodiment, the curved surfaces of the fiber rod and the cylindrical lens rod are set to be consistent with the direction of the fast-axis light or the slow-axis light, so that the set direction of the output light can be compressed and integrated accordingly.

[0039] In this embodiment, the angle of the laser emission source 10 is adjusted to change the direction of the fast axis and slow axis of the output light. For example, in actual settings, the laser emission source 10 can be configured to rotate within the range of 0-90°, so that the fast axis direction and slow axis direction are respectively opposite to the first beam shaping element 50 to achieve compression.

[0040] The uniformity distribution diagram of the output light of the line laser generator in this embodiment is shown in the appendix. Figure 4 As can be seen, it can produce line spots with higher uniformity.

[0041] In one embodiment of the present invention, the second beam shaping element 40 includes a first component 41, a second component 43, and a second aperture 42. The second aperture 42 is disposed between the first component 41 and the second component 43. The first component 41 includes at least one of an optical fiber rod and a cylindrical lens rod. The second component 43 includes at least one cylindrical lens.

[0042] In related technologies, there are also some structures that use Powell prisms to achieve uniform line lasers. However, in this embodiment, the structure used to achieve uniform line lasers is a combination of fiber rod / cylindrical rod and cylindrical mirror. The fiber rod / cylindrical rod in this embodiment is equivalent to the Powell prism in related technologies. Compared with the Powell prism, the fiber rod / cylindrical rod in this embodiment has a lower cost and is easier to produce, which can effectively improve the beam quality.

[0043] In this embodiment, the first component 41 can be either a fiber optic rod or a cylindrical lens rod, or a combination of both. During operation, the fiber optic rod or cylindrical lens rod in the first component 41 can be made of quartz material to diverge the slow-axis light spot. The second component 43 can be set as one cylindrical lens, or two or more cylindrical lenses as needed. The cylindrical lenses are made of quartz material and are mainly used to homogenize the light after it has been diverged by the first component 41 (fiber optic rod / cylindrical lens) to meet the uniformity requirements at the specified working distance.

[0044] See appendix Figure 2 The diagram shows the optical path of a line laser generator with 43 components, each including a cylindrical mirror; see appendix. Figure 3 The optical path diagram of the line laser generator in the case where the second component 43 includes two cylindrical mirrors, wherein the light is linearly projected onto the working surface 60, and wherein the second aperture 42 is disposed in front of the last cylindrical mirror alone.

[0045] In one embodiment of this utility model, light channels are formed on the first aperture 30 and the second aperture 42 respectively. The light channel of the first aperture 30 is opposite to the exit surface of the collimating lens 20, and the light channel of the second aperture 42 is opposite to the incident surface of the second component 43. The first aperture 30 and the second aperture 42 are respectively made of plastic or metal.

[0046] An aperture is generally a baffle with a specific shape of opening (such as a circular hole or a slit) that controls and optimizes the performance of a laser by limiting the area through which the light beam passes.

[0047] In this embodiment, the first aperture 30 and the second aperture 42 are positioned differently, and correspondingly, their functions and effects differ in actual use. The first aperture 30 is located on the rear side of the collimating lens 20, and its light channel can be set as a circular hole (or other shapes depending on the usage requirements). The material can be plastic or metal. It is mainly used to block stray light at the edge of the light after collimation by the collimating lens 20, ensuring that the line width and Gaussian degree meet the requirements at the specified working distance. The second aperture 42 is located between the first component 41 and the second component 43. Similarly, its light channel can be set as a circular hole (or other shapes depending on the usage requirements). The material can be plastic or metal. Its main function is to allow light that meets a certain divergence angle requirement to enter the cylindrical mirror (second component 43) on the rear side to adjust the size of the final output line spot length direction.

[0048] In one embodiment of this utility model, the collimating lens 20 is configured as at least one of a spherical and an aspherical mirror. In actual configuration, the collimating lens 20 includes at least one of a plano-convex crystal, a plano-concave lens, and a biconvex lens.

[0049] The collimating lens 20 in this embodiment can be configured in various different forms. In actual use, the structure of the collimating lens 20 can be set according to the needs.

[0050] The collimating lens 20 in this invention is used to shape the light beam to meet the requirements of linewidth, depth of field and Gaussian degree at a specified working distance.

[0051] The wavelength of the light emitted by the laser emission source 10 in this invention is between 200nm and 1100nm.

[0052] The line laser generator of this invention mainly solves the problems of small depth of field and poor Gaussianness when using the fast axis as the linewidth direction. In actual setup, the various components of the line laser generator of this invention can be determined using the following methods: First, select a suitable second beam shaping element 40 (fiber rod or cylindrical lens) based on the product size and focusing distance; then, select a suitable collimating lens 20 based on the product's working distance, linewidth, and depth of field; second, select a suitable first beam shaping element 50 (cylindrical lens / fiber rod and cylindrical lens; wherein the cylindrical lens is selected based on uniformity) based on the product's divergence angle or line length over the working distance.

[0053] This invention uses a first component 41 (fiber optic rod or cylindrical mirror) to compress the fast axis, then uses a collimating mirror 20 to further compress and collimate the fast and slow axes, and finally uses a first beam shaping element 50 (fiber optic rod or cylindrical rod mirror + cylindrical mirror) to achieve a line spot effect with a large depth of field and good Gaussianity, using the fast axis as the line width direction.

[0054] The second aspect of this utility model also discloses a three-dimensional measurement device, the three-dimensional measurement including a body and a line laser generator disposed on the body, the line laser generator being the line laser generator of the first aspect described above.

[0055] The three-dimensional measurement device in this embodiment also includes a camera, wherein the line laser generator is used to project a linear light spot onto the object to be measured, and the camera is used to acquire an image of the object to be measured by the projected linear light spot.

[0056] The three-dimensional measurement device in this embodiment can achieve higher detection accuracy and smaller measurement error, and has a wider range of applications.

[0057] The above are merely specific embodiments of this utility model, but the scope of protection of this utility model is not limited thereto. Those skilled in the art should understand that this utility model includes, but is not limited to, the contents described in the accompanying drawings and the specific embodiments above. Any modifications that do not depart from the functional and structural principles of this utility model will be included within the scope of the claims.

Claims

1. A line laser generator, the line laser generator comprising a coaxially arranged laser emission source (10) and a collimation and homogenization module, characterized in that, The line laser generator further includes a first beam shaping element (50), which is disposed between the laser emission source (10) and the collimation and homogenization module and is coaxially disposed with the laser emission source (10). The first beam shaping element (50) is used to compress the angle of the set direction of the output light of the laser emission source (10).

2. The line laser generator according to claim 1, characterized in that, The laser emission source (10) can be rotatably switched between a first position and a second position around its own axis. At the first position, the curved surface direction of the first beam shaping element (50) is consistent with the fast axis direction of the output light of the laser emission source (10); In the second position, the curved surface direction of the first beam shaping element (50) is consistent with the slow axis direction of the output light of the laser emission source (10).

3. The line laser generator according to claim 2, characterized in that, The first beam shaping element (50) includes at least one of an optical fiber rod and a cylindrical lens rod.

4. The line laser generator according to any one of claims 1 to 3, characterized in that, The collimation and homogenization module includes a collimating lens (20), a first aperture (30), and a second beam shaping element (40) arranged coaxially along the emission direction of the laser emission source (10). The second beam shaping element (40) is used to homogenize and shape the light. The first beam shaping element (50) is disposed between the laser emission source (10) and the collimating lens (20).

5. The line laser generator according to claim 4, characterized in that, The second beam shaping element (40) includes a first component (41), a second component (43), and a second aperture (42). The second aperture (42) is disposed between the first component (41) and the second component (43). The first component (41) includes at least one of an optical fiber rod and a cylindrical lens rod. The second component (43) includes at least one cylindrical lens.

6. The line laser generator according to claim 5, characterized in that, Light channels are formed on the first aperture (30) and the second aperture (42), respectively. The light channel of the first aperture (30) is opposite to the exit surface of the collimating lens (20), and the light channel of the second aperture (42) is opposite to the incident surface of the second component (43).

7. The line laser generator according to claim 5, characterized in that, The second component (43) includes multiple cylindrical mirrors arranged sequentially along the emission direction of the output light, and the second aperture (42) is located in front of the last cylindrical mirror.

8. The line laser generator according to claim 4, characterized in that, The collimating lens (20) is configured as at least one of a spherical and an aspherical mirror; and / or, the collimating lens (20) includes at least one of a plano-convex crystal, a plano-concave mirror, and a biconvex mirror.

9. The line laser generator according to any one of claims 1 to 3, characterized in that, The laser emission source (10) includes at least one of a side-emitting laser diode, a vertical cavity surface-emitting laser diode, and a transistor outline packaged laser diode; the wavelength of the light emitted by the laser emission source (10) is between 200 nm and 1100 nm.

10. A three-dimensional measuring device, comprising a body and a line laser generator disposed on the body, characterized in that, The line laser generator is the line laser generator according to any one of claims 1 to 9.

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