CN107976767B - Infrared lens precise centering device and method based on low-stress clamping - Google Patents
Infrared lens precise centering device and method based on low-stress clamping Download PDFInfo
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- CN107976767B CN107976767B CN201711381633.1A CN201711381633A CN107976767B CN 107976767 B CN107976767 B CN 107976767B CN 201711381633 A CN201711381633 A CN 201711381633A CN 107976767 B CN107976767 B CN 107976767B
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- G02—OPTICS
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- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
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Abstract
The invention discloses an infrared lens precision centering device and a centering method based on low-stress clamping, wherein the device comprises: the device comprises a two-dimensional rotating mechanism (1), a three-dimensional translation mechanism (2), a cantilever mechanism (3), a positioning conversion lens (4) and a micro-stress clamping and positioning device (5), wherein the micro-stress clamping and positioning device (5) comprises a sucker (7) and a support (6), the two-dimensional rotating mechanism (1) and the micro-stress clamping and positioning device (5) are fixed together and are positioned right above the micro-stress clamping and positioning device (5), the three-dimensional translation mechanism (2) is fixedly connected with the two-dimensional rotating mechanism (1) through the cantilever mechanism (3), and the positioning conversion lens (4) is bonded on an annular mounting table in a central circular hole of the support (6). The device solves the practical problems of inaccurate positioning of the rear lens, fragile clamping of optical materials and the like in the process of using the double-optical-path centering instrument to mount and adjust the infrared optical system, and realizes high-precision and high-efficiency mounting and adjusting of the infrared optical system.
Description
Technical Field
The invention relates to an infrared lens precision centering device and a centering method, in particular to an infrared lens precision centering device and a centering method based on low-stress clamping.
Background
The infrared transmission type optical system applied to the field of space remote sensing has the characteristics of more optical elements, more separation variables, complex structure and imaging quality requirement close to the diffraction limit, and has rigorous requirement on optical adjustment. The traditional transmission-type optical system is generally adjusted by a direct-mount centering method, i.e. the eccentricity and the inclination of each optical lens are sequentially adjusted to be within a preset tolerance range on a dual-optical-path centering instrument. However, when the method is used for assembling and adjusting, due to the shielding of the installed lens, the spherical center image of the lower surface of the installed lens cannot be observed, so that the assembling and adjusting error of the installed lens can be caused, particularly for an optical lens with a small diameter ratio, the micro translation and the inclination of the lens can cause a large amount of deviation of the spherical center, the assembling and adjusting accuracy is high in randomness, and the quality and the efficiency are difficult to guarantee. Meanwhile, as the infrared material selected for most of the spring-loaded optical system lenses is low in hardness, excessive concentrated stress is easily generated in a jackscrew centering mode used in the assembling and adjusting process, the lens is broken, and the scrapping of the lens or the performance reduction of the optical system is caused.
Disclosure of Invention
The invention aims to provide a low-stress clamping-based infrared lens precise centering device and a centering method, and solves the problems that the spherical center of the lower surface of a rear lens is shielded in the process of installing and adjusting an infrared optical system by using a double-optical-path centering instrument and the lens is easy to break edges in the clamping process.
An infrared lens precision centering device based on low stress centre gripping includes: two dimension rotary mechanism, three-dimensional translation mechanism, cantilever mechanism still include: a positioning conversion lens and a micro stress clamping and positioning device.
Wherein the micro-stress clamping and positioning device comprises a sucker and a support, wherein the support is of a hollow cylindrical structure, and an annular mounting table is arranged in a central circular hole of the support. The sucking disc is circular and coaxial bonding in support bottom. Wherein the positioning conversion lens is adhered on the annular mounting table in the central circular hole of the bracket.
The two-dimensional rotating mechanism is a rotating mechanism capable of translating in two directions perpendicular to each other. The three-dimensional translation mechanism is an adjusting mechanism capable of moving in three spatial vertical directions. The cantilever mechanism is a cantilever with a rotary joint.
The two-dimensional rotating mechanism and the micro-stress clamping and positioning device are fixed together and are positioned right above the micro-stress clamping and positioning device, and the three-dimensional translation mechanism is fixedly connected with the two-dimensional rotating mechanism through the cantilever mechanism.
Preferably, the distance between the center points of the upper and lower surfaces of the positioning conversion lens is as large as possible.
The method for precisely centering the infrared lens based on low-stress clamping comprises the following specific steps:
first step ready-to-mount lens calibration
The lens to be assembled is pre-assembled in the lens barrel, the spherical center images of the upper surface and the lower surface of the lens to be assembled are observed on the double-optical-path centering instrument rotary table, and the translation and the inclination of the centering instrument rotary table are adjusted, so that the optical axis of the lens to be assembled is coaxial with the rotating shaft of the centering instrument rotary table.
Second step positioning conversion lens calibration
The whole precision centering device is placed in an upper light path of the double-light-path centering instrument, an upper spherical center image and a lower spherical center image of the positioning conversion lens are observed by using the upper light path of the centering instrument, and an optical axis of the positioning conversion lens is adjusted to be coaxial with a rotating shaft of a turntable of the centering instrument through the two-dimensional rotating mechanism and the three-dimensional translation mechanism.
Third step of micro-stress clamping adsorption
The whole precision centering device is adjusted to move downwards through the three-dimensional translation mechanism, so that the sucker is adsorbed on the upper surface of the lens to be mounted.
Fourth step of calibrating eccentricity
And observing and recording the eccentricity a of the upper and lower spherical center points of the positioning conversion lens relative to the rotating shaft through the upper optical path of the centering instrument. Setting the radius of the center of sphere of the upper and lower surfaces of the position conversion lens to be D1、D2The radius of the spherical center of the upper and lower surfaces of the ready-to-mount lens is T1、T2The precision requirement of the lens to be mounted is as follows: and b, calculating the maximum value of the eccentricity assembling precision of the positioning conversion lens by the following formula:
C＝(D2-D1)*(sin(arcsin(a/(T2-T1))+arcsin(b/(D2-D1))))
fifth step ready lens adjustment
And moving the precise centering device absorbed with the lens to be mounted out of the lens barrel, and moving the lens into a corresponding position in the lens barrel after the other lenses are mounted. And observing the spherical center images of the upper surface and the lower surface of the positioning conversion lens through an upper optical path of the centering instrument, and enabling the eccentricity of two spherical center points of the positioning conversion lens to be less than or equal to C through the two-dimensional rotating mechanism and the three-dimensional translation mechanism.
Sixth step of lens fixation
And fixing the lens to be mounted in the lens cone, taking down the sucker and finishing mounting and adjusting.
The device can overcome the installation and adjustment error caused by the shielding of the lower surface of the middle lens in the installation and adjustment process of the straight cylindrical optical system, and improve the installation and adjustment precision.
Drawings
FIG. 1 is a block diagram of an infrared lens precision centering device based on low stress clamping;
fig. 2 is a structural diagram of a micro-stress clamping and positioning device of an infrared lens precision centering device based on low-stress clamping.
1. Two-dimensional rotating mechanism 2, three-dimensional translation mechanism 3, cantilever mechanism 4, positioning conversion lens 5, micro-stress clamping and positioning device 6, bracket 7 and sucker
Detailed Description
Example 1
An infrared lens precision centering device based on low stress centre gripping includes: two-dimensional rotary mechanism 1, three-dimensional translation mechanism 2, cantilever mechanism 3 still include: a positioning conversion lens 4 and a micro-stress clamping and positioning device 5.
Wherein micro stress centre gripping positioner 5 includes sucking disc 7 and support 6, and wherein support 6 is hollow cylindric structure, has annular mount table in the 6 central round holes of support. The sucker 7 is circular and is coaxially adhered to the bottom end of the bracket 6. Wherein the positioning conversion lens 4 is adhered on an annular mounting table in a central circular hole of the bracket 6.
The two-dimensional rotation mechanism 1 is a rotation mechanism capable of translating in two directions perpendicular to each other. The three-dimensional translation mechanism is an adjusting mechanism capable of moving in three spatial vertical directions. The cantilever mechanism 3 is a cantilever with a rotary joint.
The two-dimensional rotating mechanism 1 and the micro-stress clamping and positioning device 5 are fixed together and positioned right above the micro-stress clamping and positioning device 5, and the three-dimensional translation mechanism 2 is fixedly connected with the two-dimensional rotating mechanism 1 through the cantilever mechanism 3.
Wherein the distance between the center points of the upper and lower surfaces of the positioning conversion lens 4 is taken as large as possible.
Example 2
The method for precisely centering the infrared lens based on low-stress clamping comprises the following specific steps:
first step ready-to-mount lens calibration
The lens to be assembled is pre-assembled in the lens barrel, the spherical center images of the upper surface and the lower surface of the lens to be assembled are observed on the double-optical-path centering instrument rotary table, and the translation and the inclination of the centering instrument rotary table are adjusted, so that the optical axis of the lens to be assembled is coaxial with the rotating shaft of the centering instrument rotary table.
Second step positioning conversion lens 4 calibration
The whole precision centering device is placed in an upper light path of the double-light-path centering instrument, upper and lower spherical center images of the positioning conversion lens 4 are observed by using the upper light path of the centering instrument, and the optical axis of the positioning conversion lens 4 is adjusted to be coaxial with a rotating shaft of a turntable of the centering instrument through the two-dimensional rotating mechanism 1 and the three-dimensional translation mechanism.
Third step of micro-stress clamping adsorption
The whole precision centering device is adjusted to move downwards through the three-dimensional translation mechanism, so that the sucker 7 is adsorbed on the upper surface of the lens to be mounted.
Fourth step of calibrating eccentricity
And observing and recording the eccentricity a of the upper and lower spherical center points of the positioning conversion lens relative to the rotating shaft through the upper optical path of the centering instrument. The radius of the spherical center of the upper and lower surfaces of the position conversion lens 4 is set to be D1、D2The radius of the spherical center of the upper and lower surfaces of the ready-to-mount lens is T1、T2The precision requirement of the lens to be mounted is as follows: and b, calculating the maximum value of the eccentricity assembling precision of the positioning conversion lens 4 by the following formula:
C＝(D2-D1)*(sin(arcsin(a/(T2-T1))+arcsin(b/(D2-D1))))
fifth step ready lens adjustment
And moving the precise centering device absorbed with the lens to be mounted out of the lens barrel, and moving the lens into a corresponding position in the lens barrel after the other lenses are mounted. The central images of the upper surface and the lower surface of the positioning conversion lens 4 are observed through the upper light path of the centering instrument, and the eccentricity of two spherical center points of the positioning conversion lens 4 is less than or equal to C through the two-dimensional rotating mechanism 1 and the three-dimensional translation mechanism.
Sixth step of lens fixation
And fixing the lens to be mounted in the lens cone, taking down the sucker 7, and completing mounting and adjusting.
Claims (2)
1. An infrared lens precision centering device based on low stress centre gripping includes: two-dimensional rotary mechanism (1), three-dimensional translation mechanism (2) and cantilever mechanism (3), its characterized in that still includes: a positioning conversion lens (4) and a micro stress clamping and positioning device (5);
the micro-stress clamping and positioning device (5) comprises a sucker (7) and a support (6), wherein the support (6) is of a hollow cylindrical structure, and an annular mounting table is arranged in a central circular hole of the support (6); the sucker (7) is circular and is coaxially adhered to the bottom end of the bracket (6); wherein the positioning conversion lens (4) is adhered to an annular mounting table in a central circular hole of the bracket (6);
the two-dimensional rotating mechanism (1) is a rotating mechanism capable of translating in two mutually perpendicular directions; the three-dimensional translation mechanism is an adjusting mechanism capable of moving in three spatial vertical directions; the cantilever mechanism (3) is a cantilever with a rotary joint;
the two-dimensional rotating mechanism (1) and the micro-stress clamping and positioning device (5) are fixed together and are positioned right above the micro-stress clamping and positioning device (5), and the three-dimensional translation mechanism (2) is fixedly connected with the two-dimensional rotating mechanism (1) through the cantilever mechanism (3).
2. A low-stress clamping-based infrared lens precise centering method is characterized by comprising the following specific steps:
first step ready-to-mount lens calibration
Pre-assembling a lens to be assembled in a lens barrel, observing the spherical center images of the upper surface and the lower surface of the lens to be assembled on a double-optical-path centering instrument rotary table, and adjusting the translation and the inclination of the centering instrument rotary table to enable the optical axis of the lens to be assembled to be coaxial with the rotating shaft of the centering instrument rotary table;
second step of positioning and converting the calibration of the lens (4)
The whole precision centering device is placed in an upper light path of a double-light-path centering instrument, an upper spherical center image and a lower spherical center image of a positioning conversion lens (4) are observed by using the upper light path of the centering instrument, and the optical axis of the positioning conversion lens (4) is adjusted to be coaxial with a rotating shaft of a rotating table of the centering instrument through a two-dimensional rotating mechanism (1) and a three-dimensional translation mechanism;
third step of micro-stress clamping adsorption
The whole precision centering device is adjusted to move downwards through a three-dimensional translation mechanism, so that the sucker (7) is adsorbed on the upper surface of the lens to be mounted;
fourth step of calibrating eccentricity
Observing and recording the eccentricity a of the upper and lower spherical center points of the positioning conversion lens relative to the rotating shaft through an upper optical path of the centering instrument; the radius of the spherical center of the upper surface and the lower surface of the positioning conversion lens (4) is set as D1、D2The radius of the spherical center of the upper and lower surfaces of the ready-to-mount lens is T1、T2The precision requirement of the lens to be mounted is as follows: and b, calculating the maximum value of the eccentricity adjustment precision of the positioning conversion lens (4) by the following formula:
C＝(D2-D1)*(sin(arcsin(a/(T2-T1))+arcsin(b/(D2-D1))))
fifth step ready lens adjustment
Moving the precise centering device absorbed with the lens to be mounted out of the lens barrel, and moving the lens into a corresponding position in the lens barrel after the other lenses are mounted; observing the spherical center images of the upper surface and the lower surface of the positioning conversion lens (4) through an upper optical path of the centering instrument, and enabling the eccentricity of two spherical center points of the positioning conversion lens (4) to be less than or equal to C through the two-dimensional rotating mechanism (1) and the three-dimensional translation mechanism;
sixth step of lens fixation
And fixing the lens to be mounted in the lens cone, and taking down the sucker (7) to finish mounting and adjusting.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN108957782B (en) * | 2018-09-06 | 2023-11-21 | 深圳捷牛科技有限公司 | Integrated assembling equipment for glued lens |
| CN109116507A (en) * | 2018-09-18 | 2019-01-01 | 昆明北方红外技术股份有限公司 | The bidirectional transverse alignment Method of Adjustment of Infrared Lens group |
| CN112197698B (en) * | 2020-09-23 | 2022-05-20 | 北京遥感设备研究所 | Rotary cone angle amplification servo axis measuring method and system |
| CN115016091B (en) * | 2022-08-05 | 2022-11-08 | 山西汉威激光科技股份有限公司 | Two-axis optical lens angle adjusting device |
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| CN102998767A (en) * | 2012-11-20 | 2013-03-27 | 北京空间机电研究所 | Installation and adjustment method of infrared lenses |
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| WO2016148596A1 (en) * | 2015-03-17 | 2016-09-22 | федеральное государственное автономное образовательное учреждение высшего образования "Санкт-Петербургский национальный исследовательский университет информационных технологий, механики и оптики" (Университет ИТМО) | Method for centering lens elements of a stacked objective lens, and lens mounts for implementing same |
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