CN113721346B - Lens subassembly and have its laser displacement sensor - Google Patents
Lens subassembly and have its laser displacement sensor Download PDFInfo
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- CN113721346B CN113721346B CN202110985306.7A CN202110985306A CN113721346B CN 113721346 B CN113721346 B CN 113721346B CN 202110985306 A CN202110985306 A CN 202110985306A CN 113721346 B CN113721346 B CN 113721346B
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- laser displacement
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/0065—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element having a beam-folding prism or mirror
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B11/00—Measuring arrangements characterised by the use of optical techniques
- G01B11/02—Measuring arrangements characterised by the use of optical techniques for measuring length, width or thickness
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
-
- 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
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Length Measuring Devices By Optical Means (AREA)
Abstract
The invention relates to the technical field of laser measurement, in particular to a lens assembly and a laser displacement sensor with the same. A lens assembly, comprising: first lens, second lens and the third lens of following light transmission direction coaxial setting in proper order, first lens and third lens are biconvex lens, and the second lens is biconcave lens, just the refracting index of first lens and third lens all is greater than the refracting index of second lens, the abbe number of first lens and third lens all is less than the abbe number of second lens. The invention has higher measurement precision.
Description
Technical Field
The invention relates to the technical field of laser measurement, in particular to a lens assembly and a laser displacement sensor with the same.
Background
The laser displacement sensor is an instrument for measuring a specific distance range with high precision, and the basic principle is an optical trigonometry: the laser emitting point, the measured target point and the receiving point form a triangle, and the position of the measured target point is calculated by knowing the angle and the position information of the emitting point and the receiving point. When the displacement sensor is used, the displacement of a measured object is given in a mode of recording photoelectric position information in a measuring range of the sensor and reading calibration data. The distance measuring instrument of this principle is generally used for measuring short-range distances (referred to as displacement in the industry) below 2000 mm, and is commonly used in the aspects of rails, product thickness, flatness, size and the like. The measuring range and the measuring accuracy of the existing laser displacement sensor are various, but the accuracy is usually less than 6 microns within the wide range of 110-190 mm.
Disclosure of Invention
Therefore, the technical problem to be solved by the present invention is to overcome the defect of low measurement accuracy of the laser displacement sensor in the prior art, so as to provide a lens assembly with high measurement accuracy and a laser displacement sensor with the same.
In order to solve the above technical problem, the present invention provides a lens assembly comprising:
first lens, second lens and the third lens of following light transmission direction coaxial setting in proper order, first lens and third lens are biconvex lens, and the second lens is biconcave lens, just the refracting index of first lens and third lens all is greater than the refracting index of second lens, the abbe number of first lens and third lens all is less than the abbe number of second lens.
Optionally, the refractive indexes of the first lens and the third lens are equal and are both greater than 1.75, and the refractive index of the second lens is less than 1.5; the abbe numbers of the first lens and the third lens are equal and are both smaller than 40, and the abbe number of the second lens is larger than 60.
Optionally, a ratio of a first combined focal length of the first lens and the second lens to a total focal length of the lens assembly is smaller than-6 and larger than-7, and a ratio of a second combined focal length of the second lens and the third lens to the total focal length of the lens assembly is smaller than 3 and larger than 2.
A laser displacement sensor is also provided, comprising the lens assembly.
Optionally, the optical lens further comprises a sensor positioned in the emergent direction of the lens assembly, and the sensor is obliquely arranged relative to the light transmission direction.
Optionally, the inclination angle of the sensor with respect to the light transmission direction is less than 43 ° and greater than 40 °.
Optionally, the optical sensor further includes a mirror located between the third lens and the sensor, the mirror is disposed to be inclined with respect to the light transmission direction, a first central distance between the mirror surface of the third lens close to the mirror and the mirror is less than 17 mm and greater than 14 mm, and a second central distance between the mirror and the sensor is less than 22 mm and greater than 19 mm.
Optionally, the laser device further comprises a base and a laser assembly, wherein the laser assembly and the lens assembly are both arranged on the base, and the laser assembly is movably connected with the base.
Optionally, a first rotating member and a second rotating member are arranged on the mounting surface of the laser assembly and the base, and a first rotating shaft of the first rotating member is perpendicular to the mounting surface of the base and is perpendicular to a second rotating shaft of the second rotating member, so as to adjust the laser emitting angle and the laser emitting pitch angle of the laser assembly respectively.
Optionally, the laser instrument subassembly still includes condensing lens and laser instrument, the condensing lens with the coaxial setting of laser instrument, just the condensing lens passes through the regulating part orientation or keeps away from the laser instrument moves to adjust the distance between condensing lens and the laser instrument.
The technical scheme of the invention has the following advantages:
1. the lens assembly provided by the invention comprises a first lens, a second lens and a third lens which are coaxially arranged in sequence along the light transmission direction, wherein the first lens and the third lens are made of materials with high refractive indexes and low Abbe numbers, and the second lens is made of materials with low refractive indexes and high Abbe numbers, so that the spherical aberration and the coma aberration of the system are reduced, the lens assembly has certain symmetry and high degree of freedom, and the spherical aberration, the coma aberration, astigmatism and other distortions are corrected; the depth of field is large, and the image surface light spot is relatively small and uniform, so that the measurement precision of 4 micrometers can be obtained within the range of 150mm +/-40 mm, and the measurement precision is improved.
2. According to the laser displacement sensor provided by the invention, the reflector and the sensor are obliquely arranged relative to the light transmission direction, so that the length of the lens barrel is reduced, the structure is more compact, and the weight is relatively lighter.
3. According to the laser displacement sensor provided by the invention, the laser component is movably connected with the base, so that the laser emitting angle and the laser emitting pitch angle can be conveniently adjusted.
4. According to the laser displacement sensor provided by the invention, the condenser lens moves towards or away from the laser through the adjusting piece, so that the laser can be conveniently focused to a target distance.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
FIG. 1 is a schematic view of a lens assembly provided by the present invention;
FIG. 2 is a schematic diagram of the optical path of a laser displacement sensor;
FIG. 3 is a schematic structural diagram of a laser displacement sensor;
FIG. 4 is a schematic structural diagram of the laser displacement sensor with the cover removed;
fig. 5 is a schematic structural diagram of a laser assembly.
Description of reference numerals:
1. a first lens; 2. a second lens; 3. a third lens; 4. a barrel; 5. a supporting seat; 6. a first lens isolation ring; 7. a second lens isolation ring; 8. a lens compression ring; 9. a lens is added; 10. an optical filter; 11. a mirror; 12. a sensor; 13. a base; 14. a cover body; 15. a mounting seat; 16. a condenser lens; 17. a laser; 18. an adjustment member; 19. a first rotating member; 20. a second rotating member; 21. a trough body; 22. an object to be measured.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
A specific embodiment of the lens assembly shown in fig. 1, including a first lens 1, a second lens 2 and a third lens 3 coaxially disposed in sequence along the light transmission direction, the first lens 1, the second lens 2 and the third lens 3 are fixed in a barrel 4 at intervals, the barrel 4 is externally sleeved with a cuboid supporting seat 5, a first lens isolation ring 6 is disposed between the first lens 1 and the second lens 2, a second lens isolation ring 7 is disposed between the second lens 2 and the third lens 3, and a lens compression ring 8 is disposed on the other side of the first lens 1 away from the second lens 2, so as to ensure that the three lenses are not mutually pressed close to and rubbed under the action of external force.
The first lens 1 and the third lens 3 are both double convex lenses, the second lens 2 is a double concave lens, the refractive indexes of the first lens 1 and the third lens 3 are both larger than that of the second lens 2, and the abbe numbers of the first lens 1 and the third lens 3 are both smaller than that of the second lens 2. Specifically, the refractive indexes of the first lens 1 and the third lens 3 are equal and are both greater than 1.75, and the refractive index of the second lens 2 is less than 1.5; the abbe numbers of the first lens 1 and the third lens 3 are equal and are both smaller than 40, and the abbe number of the second lens 2 is larger than 60. The ratio of the first combined focal length of the first lens 1 and the second lens 2 to the total focal length of the lens component is smaller than-6 and larger than-7, and the ratio of the second combined focal length of the second lens 2 and the third lens 3 to the total focal length of the lens component is smaller than 3 and larger than 2. The first combined focal length refers to the distance from the main point to the focus point by taking the first lens 1 and the second lens 2 as a whole after light passes through the first lens 1 and the second lens 2, the second combined focal length refers to the distance from the main point to the focus point by taking the second lens 2 and the third lens 3 as a whole after light passes through the second lens 2 and the third lens 3, and the total focal length of the lens assembly refers to the distance from the main point to the focus point by taking the first lens 1, the second lens 2 and the third lens 3 as a whole after light sequentially passes through the first lens 1, the second lens 2 and the third lens 3.
One embodiment of the laser displacement sensor shown in fig. 2 to 5 includes a housing, and a laser assembly, an anti-reflection mirror 9, a filter 10, a lens assembly, a reflector 11 and a sensor 12 which are arranged in the housing. The shell comprises a base 13 and a cover 14 which are detachably connected, and the side wall of the cover 14 is provided with a lens 9 and an optical filter 10.
The laser assembly is arranged on the base 13, and as shown in fig. 5, the laser assembly comprises a mounting seat 15, a collecting lens 16 and a laser 17, the collecting lens 16 and the laser 17 are arranged in the mounting seat 15, the collecting lens 16 is coaxially arranged with the laser 17, the collecting lens 16 is arranged on an adjusting piece 18, and the adjusting piece 18 moves towards or away from the laser 17 to drive the collecting lens 16 to move back and forth, so that the distance between the collecting lens 16 and the laser 17 is adjusted, and laser is focused to a target distance of 150 mm. The mounting base 15 and the base 13 are movably connected, specifically, a first rotating member 19 and a second rotating member 20 are arranged on the mounting surface of the laser component and the base 13, a first rotating shaft of the first rotating member 19 is perpendicular to the mounting surface of the base 13 and is perpendicular to a second rotating shaft of the second rotating member 20, and the laser component rotates around the first rotating shaft to adjust the laser emitting angle of the laser component. The second rotating member 20 is symmetrically provided with two pitching adjusting rollers relative to the first rotating member 19, a groove 21 is arranged at a corresponding position of the mounting seat 15, the pitching adjusting rollers are arranged in the groove 21 and rotatably connected with the groove 21 through a third rotating shaft, and the third rotating shaft is perpendicular to the first rotating shaft and the second rotating shaft at the same time so as to adjust the laser emitting pitching angle.
As shown in fig. 2 and 4, a reflector 11 and a sensor 12 are further sequentially disposed in the exit direction of the lens assembly, and both the reflector 11 and the sensor 12 are disposed obliquely to the light transmission direction. The mirror 11 is inclined at an angle of 45 deg. to the direction of light transmission, and the sensor 12 is inclined at an angle of less than 43 deg. and more than 40 deg., preferably 41 deg. to the direction of light transmission. The reflecting mirror 11 and the sensor 12 are both installed on a support, the support is positioned with the base 13 through a rotating shaft, and the change of the horizontal plane angle of the light path can be realized by rotating the support in the light path debugging process.
In order to further improve the measurement accuracy, the first center distance a between the mirror surface of the third lens 3 close to the reflecting mirror 11 and the reflecting mirror 11 is less than 17 mm and more than 14 mm, preferably 16 mm; the second center distance b of the mirror 11 from the sensor 12 is less than 22 mm and greater than 19 mm, preferably 21 mm.
The sensor 12 is a CMOS linear image detector, and since the sensor 12 is greatly affected by external light, the surface of the device is oxidized to be matt black, and a light blocking sheet is correspondingly added.
The working process of the laser displacement sensor is as follows: the laser 17 emits a beam of red light, the red light irradiates the surface of a measured object 22 at a distance of 150mm through the antireflection mirror 9, reflected light enters the lens assembly through the optical filter 10, sequentially passes through the first lens 1, the second lens 2 and the third lens 3, and is focused on the reflector 11, and the reflected light finally reaches the CMOS linear image detector.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (8)
1. A lens assembly adapted for use with a laser displacement sensor, comprising:
the optical lens comprises a first lens (1), a second lens (2) and a third lens (3) which are coaxially arranged in sequence along a light transmission direction, wherein the first lens (1) and the third lens (3) are both biconvex lenses, the second lens (2) is a biconcave lens, the refractive indexes of the first lens (1) and the third lens (3) are both larger than that of the second lens (2), and the Abbe numbers of the first lens (1) and the third lens (3) are both smaller than that of the second lens (2);
the refractive indexes of the first lens (1) and the third lens (3) are equal and are both larger than 1.75, and the refractive index of the second lens (2) is smaller than 1.5; the abbe numbers of the first lens (1) and the third lens (3) are equal and are both smaller than 40, and the abbe number of the second lens (2) is larger than 60;
the ratio of the first combined focal length of the first lens (1) and the second lens (2) to the total focal length of the lens component is smaller than-6 and larger than-7, and the ratio of the second combined focal length of the second lens (2) and the third lens (3) to the total focal length of the lens component is smaller than 3 and larger than 2.
2. A laser displacement sensor comprising the lens assembly of claim 1.
3. The laser displacement sensor according to claim 2, further comprising a sensor (12) positioned in the exit direction of the lens assembly, the sensor (12) being arranged obliquely with respect to the direction of light transmission.
4. Laser displacement sensor according to claim 3, characterized in that the inclination of the sensor (12) with respect to the direction of light transmission is less than 43 ° and greater than 40 °.
5. The laser displacement sensor according to claim 3, further comprising a mirror (11) located between the third lens (3) and the sensor (12), wherein the mirror (11) is disposed obliquely with respect to the light transmission direction, a first center distance between a mirror surface of the third lens (3) close to the mirror (11) and the mirror (11) is less than 17 mm and greater than 14 mm, and a second center distance between the mirror (11) and the sensor (12) is less than 22 mm and greater than 19 mm.
6. The laser displacement sensor according to any one of claims 2-5, further comprising a base (13) and a laser assembly, wherein the laser assembly and the lens assembly are both disposed on the base (13), and the laser assembly is movably connected to the base (13).
7. The laser displacement sensor according to claim 6, wherein the laser assembly is provided with a first rotating member (19) and a second rotating member (20) on the mounting surface of the base (13), and a first rotating shaft of the first rotating member (19) is perpendicular to the mounting surface of the base (13) and is perpendicular to a second rotating shaft of the second rotating member (20) at the same time, so as to adjust the laser emitting angle and the laser emitting pitch angle of the laser assembly respectively.
8. The laser displacement sensor according to claim 7, characterized in that the laser assembly further comprises a condenser lens (16) and a laser (17), the condenser lens (16) being arranged coaxially with the laser (17), and the condenser lens (16) being moved towards or away from the laser (17) by means of an adjusting member (18) to adjust the distance between the condenser lens (16) and the laser (17).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110985306.7A CN113721346B (en) | 2021-08-25 | 2021-08-25 | Lens subassembly and have its laser displacement sensor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202110985306.7A CN113721346B (en) | 2021-08-25 | 2021-08-25 | Lens subassembly and have its laser displacement sensor |
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| CN113721346A CN113721346A (en) | 2021-11-30 |
| CN113721346B true CN113721346B (en) | 2023-02-03 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP2002341259A (en) * | 2001-05-18 | 2002-11-27 | Asahi Optical Co Ltd | Ocular for endoscope |
| CN101806956A (en) * | 2008-10-29 | 2010-08-18 | 松下电器产业株式会社 | Eyepiece lens system, finder optical system, and electronic viewfinder of imaging apparatus and imaging apparatus |
| JP2017129790A (en) * | 2016-01-21 | 2017-07-27 | オムロン株式会社 | Optical system and image capturing device |
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| CN113721346A (en) | 2021-11-30 |
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