CN115236853B - Linear light source optical system and linear laser scanning method - Google Patents
Linear light source optical system and linear laser scanning method Download PDFInfo
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- CN115236853B CN115236853B CN202211158460.8A CN202211158460A CN115236853B CN 115236853 B CN115236853 B CN 115236853B CN 202211158460 A CN202211158460 A CN 202211158460A CN 115236853 B CN115236853 B CN 115236853B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/0025—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical correction, e.g. distorsion, aberration
- G02B27/0031—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 for optical correction, e.g. distorsion, aberration for scanning purposes
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
- G02B26/10—Scanning systems
- G02B26/101—Scanning systems with both horizontal and vertical deflecting means, e.g. raster or XY scanners
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Abstract
The application discloses a linear light source optical system, the light source system includes: the device comprises a circuit board, an array light source, a linear moving mechanism, a projection lens and an anti-aberration line laser lens, wherein the array light source is electrically connected to the circuit board, and the projection lens and the anti-aberration line laser lens are relatively fixedly arranged; light from the array light source is operatively directed into a light inlet of the projection lens. The linear light source optical system provided by the application has the advantages that the array light source is single-row, only one laser line is generated after the array light source passes through the optical system, single-line laser scanning can be realized, the array light source, the projection lens and the whole structure of the distortion-eliminating line laser lens are relatively displaced through the linear moving mechanism, so that one laser line can realize multi-view-field laser line scanning, and meanwhile, the distortion-eliminating line laser lens in the optical system can carry out distortion correction on the laser line with a large view field, so that the laser line scanning is carried out under all view fields.
Description
Technical Field
The application relates to the technical field of 3D depth imaging, in particular to a linear light source optical system and a linear laser scanning method.
Background
In the current 3D vision or laser radar industry, in the scheme of an active illumination light source of a transmitting end, a basic technical route for realizing point or line scanning is as follows:
1. a point light source is realized by adopting an edge emission light source and a collimation system, and then point scanning is realized by a vibrating mirror, a rotating prism or a rotating mirror;
2. or the line laser is realized in a mode of an edge emission light source, a collimation system and a beam expanding lens (or a Baweil prism), and then the line scanning is realized in a mode of a galvanometer, a rotating prism or a rotating mirror;
3. or a DLP projection mode is used for realizing point and line coded illumination of an illumination target;
4. the point or line illumination mode is realized by the mode of side emission light source, collimation and DOE;
in the current light source scheme, the distortion problem in the large-angle ray-emitting laser beam exists zero-order spots, the core device monopolizes and is high in price, and the optical implementation process is difficult.
Disclosure of Invention
The application provides a linear light source optical system and a linear laser scanning method, which solve the technical problem that distortion in a large-angle ray emitting laser beam exists in the prior art and zero-order spots exist.
The present application provides a linear light source optical system, the light source system comprising: the device comprises a circuit board, an array light source, a linear moving mechanism, a projection lens and an anti-aberration line laser lens, wherein the array light source is electrically connected to the circuit board, the projection lens and the anti-aberration line laser lens are relatively fixedly arranged, and a light outlet of the projection lens is injected into the anti-aberration line laser lens;
the circuit board provided with the array light source is fixedly arranged on the linear moving mechanism, the projection lens and the distortion line eliminating laser lens are fixedly arranged on one side of the linear moving mechanism, and light emitted by the array light source is operably injected into a light ray inlet of the projection lens;
or alternatively, the first and second heat exchangers may be,
the projection lens is fixedly arranged on the linear moving mechanism, the distortion line eliminating laser lens is fixedly arranged on the projection lens, the circuit board and the array light source are fixedly arranged on one side of the linear moving mechanism, and the projection lens is operable to receive light emitted by the array light source.
In some embodiments, the array light source is a VCSEL light source.
In some embodiments, the array light source is at a focal plane position of the projection lens, and the matching target surface size of the projection lens is larger than the effective light emitting area of the array light source.
In some embodiments, the distortion line eliminating laser lens is a fan-shaped concave cylindrical mirror structure, the distortion line eliminating laser lens is a central axis symmetrical structure along the X direction and the Y direction, and a first optical curved surface is arranged on the inner side surface of the distortion line eliminating laser lens, and the first optical curved surface is also a central axis symmetrical structure along the X direction and the Y direction.
In some embodiments, the distortion-line eliminating laser lens is an arc cylindrical mirror array structure, the distortion-line eliminating laser lens is a central axis symmetrical structure along an X direction and a Y direction, a second optical curved surface is arranged on the inner side surface of the distortion-line eliminating laser lens, the second optical curved surface is a cylindrical mirror array curved surface in the X direction, and the second optical curved surface is a central axis symmetrical structure in the Y direction.
In some embodiments, the linear motion mechanism is a ball screw pair or a linear slide rail.
A scanning method of a linear light source optical system, using the linear light source optical system described in the above technical solution, the scanning method comprising:
the linear laser scans along the Y direction, the linear moving mechanism is used for controlling the displacement of the circuit board in the Y direction according to a given program, and the array light source is welded on the circuit board, so that the movement displacement of the light source in the Y direction according to the given program is realized; by the function of the optical system, scanning at different angles of view is realized.
The application has the following beneficial effects:
the linear light source optical system provided by the application has the advantages that the array light source is single-row, only one laser line can be generated after the array light source passes through the optical system, single-line laser scanning or multi-line laser scanning can be realized, the array light source and the projection lens are relatively displaced with the whole structure of the distortion-eliminating line laser lens through the linear moving mechanism, so that one laser line or a plurality of laser lines can realize multi-view-field laser line scanning, and meanwhile, the distortion-eliminating line laser lens in the optical system can correct distortion of a large-view-field laser line, so that distortion-free laser line scanning is realized under all view fields.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings that are used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the description below are only some embodiments of the present application.
FIG. 1 is a schematic diagram of an overall structure of a light source system according to the present application;
FIG. 2 is a schematic diagram of a light source system according to a second embodiment of the present application;
fig. 3 is a schematic structural diagram of an aberration-eliminating line laser lens in embodiment 1 of the light source system provided by the application;
fig. 4 is a schematic structural diagram of an aberration-eliminating line laser lens in embodiment 2 of the light source system provided by the application;
FIG. 5 is a schematic view of the central field scanning optical shaping of the light source system according to the present application;
FIG. 6 is a schematic diagram of a light source system according to the present application without an anamorphic laser lens and a laser line formed by the anamorphic laser lens;
FIG. 7 is a schematic diagram of a laser line principle formed by a plurality of rows of array light sources passing through an undistorted laser lens in the light source system;
fig. 8 is a comparison chart of optical stretching and shaping optical path effects of the light source system provided by the application.
Wherein, 1-the circuit board; 2-array light sources; 3-a projection lens; 4-an anamorphic line laser lens; 41-a first optical curved surface; 42-a second optical curved surface; 5-linear movement mechanism.
Detailed Description
The embodiment of the application solves the technical problem that the linear laser beam emitted at a large angle in the prior art has distortion and zero-order spots by providing the linear light source optical system.
The left side of fig. 5 is a single-row VCSEL light source image, the middle is an effect image projected by the VCSEL light source after passing through a projection lens, and the right side is an effect image after passing through an anamorphic line laser lens.
The left side of fig. 6 is a VCSEL light source image, the middle is an effect image projected by the VCSEL light source after passing through a projection lens, the upper right side is a line laser distortion bending image appearing through a normal cylindrical lens or a powell lens, and the lower right side is an effect image after passing through an anti-distortion line laser lens.
The left side of fig. 7 is a multi-row VCSEL light source image, the middle is an effect image projected by the VCSEL light source after passing through a projection lens, and the right side is an effect image after passing through an anamorphic line laser lens.
In fig. 8, the upper diagram is an optical stretch-shaping optical path effect diagram of the light source system without the anamorphic line laser lens, and the lower diagram in fig. 8 is an optical stretch-shaping optical path effect diagram of the light source system with the anamorphic line laser lens.
The technical scheme in the embodiment of the application aims to solve the technical problems, and the overall thought is as follows:
as shown in fig. 1 to 8, the present application provides a linear light source optical system including: the device comprises a circuit board 1, an array light source 2, a linear moving mechanism 5, a projection lens 3 and an anti-aberration line laser lens 4, and specifically, the array light source 2 is a VCSEL light source, the array light source 2 is electrically connected to the circuit board 1, the projection lens 3 and the anti-aberration line laser lens 4 are relatively fixedly arranged, and a light outlet of the projection lens 3 is injected into the anti-aberration line laser lens 4;
the circuit board 1 provided with the array light source 2 is fixedly arranged on the linear moving mechanism 5, the projection lens 3 and the distortion line eliminating laser lens 4 are fixedly arranged on one side of the linear moving mechanism 5, and light emitted by the array light source 2 is operably injected into a light ray inlet of the projection lens 3;
or alternatively, the first and second heat exchangers may be,
the projection lens 3 is fixedly arranged on the linear movement mechanism 5, the distortion line eliminating laser lens 4 is fixedly arranged on the projection lens 3, the circuit board 1 and the array light source 2 are fixedly arranged on one side of the linear movement mechanism 5, and the projection lens 3 is operable to receive light emitted by the array light source 2.
The array light source 2 is a single row, only one laser line is generated after passing through the optical system, the array light source 2 can also be a plurality of rows, single-line laser scanning or multi-line laser scanning can be realized, relative displacement is generated between the array light source 2 and the integral structure of the projection lens 3 and the distortion-eliminating line laser lens 4 through the linear moving mechanism 5, so that the multi-view-field laser scanning is realized by one laser line or a plurality of laser lines, and meanwhile, the distortion-eliminating line laser lens in the optical system can correct distortion of a large-view-field laser line, so that the distortion-eliminating line laser scanning is realized under all view fields.
The displacement is linear, the curved distortion line laser can be corrected only by focusing on the displacement precision, the conversion between the corner of a rotation mode and the target field of view is omitted, the structural stability is better, no reflection exists in the light path, the light path construction process is simple, the scanning precision is relatively easy to control, and the optical realization process difficulty is low.
In order to better understand the above technical solutions, the following detailed description will refer to the accompanying drawings and specific embodiments.
Preferably, the array light source 2 is located at the focal plane position of the projection lens 3, and the size of the matching target surface of the projection lens 3 is larger than that of the effective light emitting area of the array light source 2, so that the whole projection imaging of the light emitting area of the VCSEL light source is ensured, and the larger the aperture is, the larger the light effect is, and the better the projection effect is.
Example 1
As shown in fig. 3, the de-distortion line laser lens 4 has a fan-shaped concave cylindrical mirror structure, the de-distortion line laser lens 4 has a central axis symmetrical structure along the X-direction and the Y-direction, a first optical curved surface is disposed on an inner side surface of the de-distortion line laser lens 4, and the first optical curved surface 41 has a central axis symmetrical structure along the X-direction and the Y-direction.
Example 2
As shown in fig. 4, the distortion-eliminating line laser lens 4 is an arc-shaped cylindrical mirror array structure, the distortion-eliminating line laser lens 4 is a central axis symmetrical structure along the X direction and the Y direction, a second optical curved surface 42 is disposed on the inner side surface of the distortion-eliminating line laser lens 4, the second optical curved surface 42 is a cylindrical mirror array curved surface in the X direction, and the second optical curved surface 42 is a central axis symmetrical structure in the Y direction.
Through the processing of the two types of distortion line eliminating laser lenses 4, the minimum control size of the distortion line eliminating laser lenses 4 is larger than 50 microns in structure as preferable, and the surface type tolerance is +/-0.05 mm.
The curvature of the Y direction of the distortion eliminating line laser lens 4 is the same in the two schemes, the main function of the curvature of the X direction of the distortion eliminating line laser lens 4 is to stretch and shape the dot matrix laser projected by the projection lens 3 into line laser with required light distribution, and the main function of the curvature of the Y direction of the distortion eliminating line laser lens 4 is to eliminate line laser distortion, prevent laser distortion from bending, and enable the laser distortion eliminating effect to be better.
Specifically, the linear moving mechanism 5 is a ball screw pair or a linear slide rail, which is a prior art, and how to drive and omit the driving structure in this and the drawings, and fix the circuit board 1 on the sliding block of the ball screw pair or the linear slide rail, or fix the projection lens on the sliding block of the ball screw pair or the linear slide rail. The one-dimensional linear moving mechanism 5 is linear in displacement, only the displacement precision is required to be concerned, the general displacement precision is controlled at the diameter of a VCSEL luminous hole, such as about 10-30 um, the conversion of the rotation angle and the target visual field is omitted, the linear laser correction effect is better, and the difficulty is lower.
A scanning method of a linear light source optical system, using the linear light source optical system described in the above technical solution, the scanning method comprising:
the linear laser scans along the Y direction, the linear moving mechanism is used for controlling the displacement of the circuit board in the Y direction according to a given program, and the array light source is welded on the circuit board, so that the movement displacement of the light source in the Y direction according to the given program is realized; by the function of the optical system, scanning at different angles of view is realized.
While preferred embodiments of the present application have been described, additional variations and modifications in those embodiments may occur to those skilled in the art once they learn of the basic inventive concepts. It is therefore intended that the following claims be interpreted as including the preferred embodiments and all such alterations and modifications as fall within the scope of the application.
It will be apparent to those skilled in the art that various modifications and variations can be made to the present application without departing from the spirit or scope of the application. Thus, it is intended that the present application also include such modifications and alterations insofar as they come within the scope of the appended claims or the equivalents thereof.
Claims (7)
1. A linear light source optical system, the light source system comprising: the device comprises a circuit board, an array light source, a linear moving mechanism, a projection lens and an anti-aberration line laser lens, wherein the array light source is electrically connected to the circuit board, the projection lens and the anti-aberration line laser lens are relatively and fixedly arranged, a light ray outlet of the projection lens is injected into the anti-aberration line laser lens, the anti-aberration line laser lens has an X-direction curvature and a Y-direction curvature, the X-direction curvature is used for stretching and shaping single-row lattice laser projected by the projection lens into line laser, and the Y-direction curvature is used for eliminating distortion and bending in the Y-direction of the line laser;
the array light source is a single-row point light source arranged along the X direction, the circuit board provided with the array light source is fixedly arranged on the linear moving mechanism and moves along the Y direction under the action of the linear moving mechanism, the projection lens and the distortion line eliminating laser lens are fixedly arranged on one side of the linear moving mechanism, and light emitted by the array light source is operably injected into a light inlet of the projection lens;
or alternatively, the first and second heat exchangers may be,
the projection lens is fixedly arranged on the linear moving mechanism, the distortion line eliminating laser lens is fixedly arranged on the projection lens, the circuit board and the array light source are fixedly arranged on one side of the linear moving mechanism, the array light source comprises a plurality of rows of point light sources arranged along the X direction, the plurality of rows of point light sources are arranged along the Y direction, the array light source is driven by the circuit board to light one or more rows of point light sources arranged along the X direction, and the projection lens and the distortion line eliminating laser lens move along the Y direction under the action of the linear moving mechanism and are operable to receive light emitted by the array light source.
2. The linear light source optical system of claim 1, wherein the array light source is a VCSEL light source.
3. The linear light source optical system of claim 1, wherein the array light source is in a focal plane position of the projection lens, and wherein a matching target surface size of the projection lens is larger than an effective light emitting area of the array light source.
4. The linear light source optical system of claim 1, wherein the de-distortion line laser lens has a fan-shaped concave cylindrical mirror structure, the de-distortion line laser lens has a central axis symmetrical structure along the X-direction and the Y-direction, and a first optical curved surface is disposed on an inner side surface of the de-distortion line laser lens, and the first optical curved surface has a central axis symmetrical structure along the X-direction and the Y-direction.
5. The linear light source optical system of claim 1, wherein the distortion line eliminating laser lens has an arc cylindrical mirror array structure, the distortion line eliminating laser lens has a central axis symmetrical structure along an X direction and a Y direction, and a second optical curved surface is disposed on an inner side surface of the distortion line eliminating laser lens, the second optical curved surface is a cylindrical mirror array curved surface in the X direction, and the second optical curved surface is a central axis symmetrical structure in the Y direction.
6. The linear light source optical system according to claim 1, wherein the linear movement mechanism is a ball screw pair or a linear slide rail.
7. A scanning method of a linear light source optical system, characterized in that the linear light source optical system according to any one of claims 1 to 6 is used, the scanning method comprising:
the linear laser scans along the Y direction, the linear moving mechanism is used for controlling the displacement of the circuit board in the Y direction according to a given program, and the array light source is welded on the circuit board, so that the movement displacement of the light source in the Y direction according to the given program is realized; by the function of the optical system, scanning at different angles of view is realized.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211158460.8A CN115236853B (en) | 2022-09-22 | 2022-09-22 | Linear light source optical system and linear laser scanning method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202211158460.8A CN115236853B (en) | 2022-09-22 | 2022-09-22 | Linear light source optical system and linear laser scanning method |
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| CN115236853A CN115236853A (en) | 2022-10-25 |
| CN115236853B true CN115236853B (en) | 2023-08-29 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4621892A (en) * | 1982-11-10 | 1986-11-11 | Hitachi, Ltd. | Light scanning device using lenses |
| JP2004045718A (en) * | 2002-07-11 | 2004-02-12 | Nec Viewtechnology Ltd | Illumination optical system and magnified projection display device |
| CN102162926A (en) * | 2010-01-18 | 2011-08-24 | 卡姆特有限公司 | System and method of irradiating inspected object with curved optical element |
| CN102354053A (en) * | 2011-10-31 | 2012-02-15 | 四川九洲电器集团有限责任公司 | Flyback optical system and method for eliminating image blurring |
| CN102801985A (en) * | 2011-05-27 | 2012-11-28 | 日立视听媒体股份有限公司 | Optical beam scanning device and image display device using the same |
| CN114904152A (en) * | 2020-07-31 | 2022-08-16 | 西安炬光科技股份有限公司 | Laser dot matrix system and laser dot matrix therapeutic instrument |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4266660B2 (en) * | 2003-02-18 | 2009-05-20 | キヤノン株式会社 | Projection type display optical system and projection type image display device |
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2022
- 2022-09-22 CN CN202211158460.8A patent/CN115236853B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4621892A (en) * | 1982-11-10 | 1986-11-11 | Hitachi, Ltd. | Light scanning device using lenses |
| JP2004045718A (en) * | 2002-07-11 | 2004-02-12 | Nec Viewtechnology Ltd | Illumination optical system and magnified projection display device |
| CN102162926A (en) * | 2010-01-18 | 2011-08-24 | 卡姆特有限公司 | System and method of irradiating inspected object with curved optical element |
| CN102801985A (en) * | 2011-05-27 | 2012-11-28 | 日立视听媒体股份有限公司 | Optical beam scanning device and image display device using the same |
| CN102354053A (en) * | 2011-10-31 | 2012-02-15 | 四川九洲电器集团有限责任公司 | Flyback optical system and method for eliminating image blurring |
| CN114904152A (en) * | 2020-07-31 | 2022-08-16 | 西安炬光科技股份有限公司 | Laser dot matrix system and laser dot matrix therapeutic instrument |
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