CN111596457A - Small reflector steering mechanism with high pointing accuracy - Google Patents
Small reflector steering mechanism with high pointing accuracy Download PDFInfo
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- CN111596457A CN111596457A CN202010412236.1A CN202010412236A CN111596457A CN 111596457 A CN111596457 A CN 111596457A CN 202010412236 A CN202010412236 A CN 202010412236A CN 111596457 A CN111596457 A CN 111596457A
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- mirror
- steering mechanism
- pointing accuracy
- driving device
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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
- G02B26/0816—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light by means of one or more reflecting elements
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Abstract
The invention relates to a small-sized reflector steering mechanism with high pointing accuracy, which comprises a reflector, a positioning piece, a rotating piece, a driving device and a sensor. According to the invention, the fixing piece with a specific structure is adopted to realize the local positioning of the reflecting lens, the driving device is matched with the two groups of crossed reed-type flexible hinges to complete the integral rotation of the lens body and the lens frame structure, and the closing control of the sensor and the driving device is used for correcting and adjusting the pointing angle of the lens body in real time, so that the high-precision pointing of the lens body within the rotation angle range of +/-2.5 degrees is ensured. The invention has smaller volume, can adapt to different requirements of space environment and ground experiment environment, has reliable structure, convenient disassembly of each structural module and small damage risk.
Description
Technical Field
The present invention relates to a steering mechanism for a small-sized mirror with high pointing accuracy. The technical field of space optical instruments, ground optical experiment tests and the like is involved, and the device is particularly applied to space optical-mechanical structures with strict requirements on size, weight, steering precision and the like of the overall structure.
Background
In some space optical instruments, an optical machine structure is in the process of moving along a track along with a satellite carrier, and the satellite carrier has limited fine adjustment capability, so that a reflector is required to be adjusted actively at a small angle according to the change of the actual light incidence angle sometimes, and the steering process of a mirror body is required to ensure high pointing accuracy of the mirror body and avoid axial translation of the mirror body as much as possible, so that the change of an optical path difference is caused, and the accuracy of optical detection is influenced. The optical device working in the space environment is accompanied by larger temperature fluctuation than that in the ground experimental environment, and a reflector steering mechanism is required to have certain self-adaptive capacity to the change of the external temperature. The research and development of the small reflector steering mechanism with high pointing accuracy is of great significance.
Disclosure of Invention
The invention aims to provide a small-sized reflector steering mechanism with high pointing accuracy.
In order to achieve the purpose, the invention adopts the following technical scheme: a small-sized reflector steering mechanism with high pointing accuracy comprises a reflector, a positioning piece, a rotating piece, a driving device and a sensor; the reflecting lens and the positioning piece are arranged in the mirror chamber, and the reflecting lens is fixedly connected with the mirror bracket through the positioning piece; the rotating pieces are two groups of crossed reed type flexible hinges and are respectively arranged at two radial ends of the reflecting mirror; the driving device is connected with the hinge connecting shaft of the rotating piece and drives the rotating piece to drive the reflecting mirror piece to rotate; the sensor detects the change of the pointing angle of the reflector and feeds back the change to the driving device to form closed-loop control with the driving device.
The steering mechanism of the invention adopts the positioning piece to perform local positioning on the mirror body structure of the reflector, the integral rotation of the mirror body and the mirror frame structure is completed by adopting the driving device to match with the rotating piece, namely two groups of crossed reed-type flexible hinges, the driving device drives the push rod of the driving device to do linear motion, and further drives the connecting shaft connecting the upper crossed reed-type flexible hinge and the lower crossed reed-type flexible hinge to do translational motion, thereby realizing the change of the rotation angle of +/-2.5 degrees of the reflector. When the mirror body is in a working state, the sensor detects the change of the pointing angle of the mirror body in real time, feeds back the corner information of the mirror body, and the sensor is matched with the driving device to form closed-loop control, so that the real-time correction and adjustment of the pointing angle of the mirror body are carried out, and the high-precision directivity of the mirror body in the +/-2.5-degree corner range is ensured. The steering mechanism has smaller volume and can meet different requirements of space environment and ground experimental environment.
Furthermore, the positioning piece is of a wide sheet flexible structure and comprises an arc-shaped head (sheet) attached to the edge of the reflector, a fixing foot connected with the spectacle frame and a connecting piece (wide body) connecting the fixing foot and the arc-shaped head.
Furthermore, the curvature radius of the arc-shaped head of the positioning piece is the same as that of the outer edge of the reflector; the arc-shaped head is connected with the edge of the lens in a gluing way.
Furthermore, the setting element is equipped with three groups, three groups of setting elements along the outer edge evenly distributed of reflector plate, be 120 equipartition along the mirror holder center promptly. The lens is fixed in a mode of supporting 3 points on the side face, so that vibration load in the rotation process of the lens body can be effectively reduced, and the lens body deformation caused by temperature load in the actual working environment of the lens body can be effectively reduced.
Furthermore, the fixed foot is in an isosceles trapezoid structure, the short bottom edge is connected with the connecting piece, and the two bottom corners of the long bottom edge are fixed on the mirror bracket through the positioning screws.
Furthermore, the setting element is equipped with three groups, three groups of setting elements along the outer edge evenly distributed of reflector plate, be 120 equipartition along the mirror holder center promptly.
Furthermore, the crossed reed type flexible hinges are arranged in an up-and-down symmetrical mode, geometric central shafts (rotating shafts) of the two groups of crossed reeds are collinear and coincide with the surface of the mirror body of the reflector, and cross coupling between the rotation direction of the mirror body and the linear driving direction of the motor is reduced to the maximum extent. In addition, the crossed reed type flexible hinge adopts an integral symmetrical structure, has compact structure and light weight, requires smaller installation space and has smaller inertia force and surface stress. The crossed shafts of the two crossed reed type flexible hinges are overlapped, the rotation precision is high, the shaft drift is small, and the rotation process is stable. The connecting shaft between the two flexible hinges can ensure that the upper flexible hinge and the lower flexible hinge have the same deformation amount in real time under the driving action of the driving device.
Furthermore, the reflection lens and the positioning piece structure are integrally arranged in the mirror chamber, one side of the crossed reed type flexible hinge is fixed on the mirror chamber frame, and the other side of the crossed reed type flexible hinge is connected with the mirror frame.
Further, the driving device is a piezoelectric ceramic linear motor. The piezoelectric ceramic linear motor and the high-precision sensor both belong to low-power-consumption devices, so that the reflector steering mechanism can adapt to the environment of a space precision carrier.
Furthermore, the opening of the mirror chamber frame on one side of the mirror surface of the reflection lens is a straight notch shape instead of a circular shape, and the opening is provided with a cut edge, so that the mirror chamber frame can not shield light rays in the direction rotating process of the mirror body.
Furthermore, the bottom of the mirror chamber frame is provided with a detachable supporting leg which is in a circular sheet structure, and the supporting legs are provided with gaskets, so that the height of the structure can be finely adjusted by replacing the gaskets; the number of the supporting feet is preferably 3.
The invention has the advantages and beneficial effects that:
1. the invention has the advantages of reliable overall structure, accurate adjustment of the pointing angle of the mirror body, simple and convenient operation and control, small occupied space and the like, can finish high-precision steering angle adjustment of the small reflector, and solves the practical problems of small structure size and light structure weight of the high-precision pointing mirror in space optical mechanical devices and ground experimental environments.
2. When the pointing angle of the small reflector is adjusted, the flexible hinge connecting shaft is directly driven by the piezoelectric ceramic motor, and the linear motion of the flexible hinge connecting shaft is converted into the rotary motion of the reflector body around the rotating central shaft of the crossed reed type flexible hinge, so that the angle adjustment of +/-2.5 degrees is realized.
3. When the small reflector pointing angle is adjusted, the high-precision sensor is adopted to detect the rotation angle of the reflector in real time, information is fed back, and the high-precision piezoelectric ceramic linear motor is used for adjusting the pose, so that the rotation precision of the reflector is ensured.
4. The invention adopts a double-leg mirror bracket structure for supporting the mirror body of the small reflector, and the structure can buffer external mechanical additional load on the mirror body structure so as to play a role in buffering temperature load; compared with the traditional bearing mechanism, the crossed reed type flexible hinge mechanism for realizing the turning of the mirror body avoids the influence of bearing play on the rotating pointing precision and has smaller volume and structural stability.
5. The opening of the mirror chamber frame corresponding to the reflecting mirror is a straight notch type instead of a round shape, and the opening is provided with the cut edges, so that the mirror chamber frame can not shield light rays in the process of directional rotation of the mirror body.
Drawings
Fig. 1 is a general structural view (front view) of the present invention.
Fig. 2 is a schematic diagram of the present invention in a slanted plan view (isometric view).
Fig. 3 is a diagram of the internal structural components of the present invention.
Fig. 4 is a schematic view of the positioning member of the present invention.
Fig. 5 is a plan view of the top and front structures of fig. 4.
Wherein: 1. a support frame; 2. a drive device; 3. a mirror plate; 4. supporting legs of the mirror chamber frame; 5. a connecting shaft; 6. a rotating member; 7. a mirror chamber frame; 8. a frame; 9. a positioning member; 91. an arcuate head portion; 92. a connecting member; 93. fixed foot, 10, sensor.
Detailed Description
The invention is further described below with reference to the accompanying drawings to illustrate the technical solutions in detail.
As shown in fig. 1 to 3, the steering mechanism of a small-sized mirror with high pointing accuracy includes a support frame 1 of a driving device, a driving device 2, a mirror 3, a mirror chamber frame 7, a mirror chamber frame support foot 4, a rotating member 6, a connecting shaft 5 of the rotating member, a mirror frame 8, a positioning member 9 and a sensor 10.
The diameter-thickness ratio of the reflector 3 is 4:1, so that the reflector has enough rigidity in the rotation process. The shooting lens 3 is fixedly connected with a lens frame 8 through a positioning piece 9; the rotating pieces 6 are two groups of crossed reed-type flexible hinges which are respectively arranged at two radial ends of the reflector 3, the crossed reed-type flexible hinges are arranged in an up-down symmetrical mode, and geometric central axes of the two groups of crossed reed-type flexible hinges are collinear and coincide with the surface of the reflector 3; the reflection lens 3 and the positioning piece 9 are arranged in the mirror chamber, one side of the crossed reed type flexible hinge is fixed on the mirror chamber frame 7, and the other side of the crossed reed type flexible hinge is connected with the mirror frame 8. The driving device 2 is a piezoelectric ceramic linear motor, a driving rod of the piezoelectric ceramic linear motor is connected with a hinge connecting shaft 5 of the crossed reed type flexible hinge, and the crossed reed type flexible hinge is driven to drive the lens to rotate; the sensor 10 detects the change of the pointing angle of the lens and feeds the change back to the driving device 2 to form closed-loop control with the driving device 2.
The positioning pieces 9 are provided with three groups, and the three groups of positioning pieces are uniformly distributed along the outer edge of the lens. The positioning piece 9 is of a flexible structure and has certain buffering and vibration damping effects. The assembly includes an arcuate head 91 that fits the edge of the lens, a securing leg 93 that connects to the frame, and a connector 92 that connects the securing leg 93 to the arcuate head 91. The radius of curvature of the arc-shaped head 91 of the positioning piece 9 is the same as that of the outer edge of the lens; the arc-shaped head 91 is connected with the edge of the reflector 3 by adhesive bonding so as to realize the complete fit of the lens frame sheet and the lens body. The connecting piece 92 is of a ladder-shaped structure; the fixing feet 93 are in an isosceles trapezoid structure, the short bottom edge of the isosceles trapezoid is connected with the connecting piece 92, and the two bottom angles of the long bottom edge are fixed on the mirror bracket 8 through positioning screws; the fixing leg 93 is parallel to the connecting member 92.
The bottom of the mirror chamber frame 7 is provided with a supporting leg 4; the supporting legs 4 are round thin sheets, and gaskets are arranged on the supporting legs. The opening of the mirror chamber frame 7, which is positioned at one side of the mirror surface of the reflector, is a straight notch shape, and the opening is provided with a trimming edge.
When the mirror body is in a working state, the high-precision sensor 10 detects the change of the pointing angle of the mirror body in real time, feeds back the corner information of the mirror body, and forms closed-loop control by matching with a high-precision piezoelectric ceramic linear motor to correct and adjust the pointing angle of the mirror body in real time.
The cross reed type flexible hinge is stable in structure in the rotating process, small in introduced corner error, and capable of enabling the small reflector steering mechanism to have higher pointing accuracy due to cooperation of all parts.
Claims (10)
1. A small-sized reflector steering mechanism with high pointing accuracy comprises a reflector (3), and is characterized by further comprising a positioning piece (9), a rotating piece (6), a driving device (2) and a sensor (10); the reflection lens is fixedly connected with the spectacle frame (8) through a positioning piece; the rotating pieces (6) are two groups of crossed reed-type flexible hinges and are respectively arranged at the two radial ends of the reflecting lens (3); the driving device (2) is connected with a hinge connecting shaft (5) of the rotating piece (6) and drives the rotating piece (6) to drive the reflecting mirror piece (3) to rotate; the sensor (10) detects the change of the pointing angle of the reflector and feeds the change back to the driving device (2) to form closed-loop control with the driving device (2).
2. The steering mechanism for a small-sized reflecting mirror with high pointing accuracy as claimed in claim 1, wherein said positioning member (9) is of a flexible structure and comprises an arc-shaped head (91) attached to the edge of the reflecting mirror (3), a fixing leg (93) connected to the mirror frame (8), and a connecting member (92) connecting the fixing leg (93) and the arc-shaped head (91).
3. A steering mechanism for a compact mirror with high pointing accuracy as claimed in claim 2, wherein said arc-shaped head (91) of said positioning member has the same radius of curvature as the outer edge of the mirror plate (3); the arc-shaped head (91) is connected with the edge of the reflecting lens (3) in an adhesive way.
4. A steering mechanism for a compact mirror with high pointing accuracy according to claim 1 or 2, characterized in that said positioning members (9) are provided in three sets, said three sets of positioning members (9) being evenly distributed along the outer edge of the mirror plate (3).
5. A steering mechanism for a compact mirror with high pointing accuracy as claimed in claim 2, wherein said fixing leg (93) has an isosceles trapezoid shape, the short bottom side is connected to the connecting member 92, and the two bottom corners of the long bottom side are fixed to the mirror frame (8) by means of set screws.
6. A compact mirror steering mechanism with high pointing accuracy according to claim 1, wherein the cross-reed type flexible hinges are arranged in an up-down symmetrical manner, and the geometric central axes of the two sets of cross-reed type flexible hinges are collinear and coincide with the mirror surface of the mirror plate (3).
7. A compact mirror steering mechanism with high pointing accuracy according to claim 1, characterized in that the mirror plate (3) and the positioning member (9) are disposed in the mirror housing, and the cross-reed type flexible hinge is fixed to the housing frame (7) on one side and is connected to the mirror holder (8) on the other side.
8. A steering mechanism for a compact mirror with high pointing accuracy as claimed in claim 7, wherein the opening of the mirror housing frame (7) on the mirror surface side of the mirror plate (3) is a straight notch type, and the opening is provided with a cut edge.
9. A steering mechanism for a small-sized reflecting mirror with high pointing accuracy according to claim 7, wherein the bottom of the mirror chamber frame (7) is provided with a supporting foot (4); the supporting legs (4) are round thin sheets, and gaskets are arranged on the supporting legs.
10. A steering mechanism for a small mirror with high pointing accuracy according to claim 1, characterized in that said driving means (2) is a piezo-ceramic linear motor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010412236.1A CN111596457A (en) | 2020-05-15 | 2020-05-15 | Small reflector steering mechanism with high pointing accuracy |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010412236.1A CN111596457A (en) | 2020-05-15 | 2020-05-15 | Small reflector steering mechanism with high pointing accuracy |
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| Publication Number | Publication Date |
|---|---|
| CN111596457A true CN111596457A (en) | 2020-08-28 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010412236.1A Pending CN111596457A (en) | 2020-05-15 | 2020-05-15 | Small reflector steering mechanism with high pointing accuracy |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130083383A1 (en) * | 2010-08-23 | 2013-04-04 | Hartmut Schneider | Mirror module |
| US20160356984A1 (en) * | 2012-05-07 | 2016-12-08 | Panasonic Intellectual Property Management Co., Ltd. | Optical element |
| CN109669253A (en) * | 2019-01-31 | 2019-04-23 | 中国科学院西安光学精密机械研究所 | Large caliber reflecting mirror vibration damping flexible support structure and mirror assembly |
| CN110082904A (en) * | 2019-05-31 | 2019-08-02 | 中国科学院国家天文台南京天文光学技术研究所 | High-precision and stability suitable for space environment put lens device and its working method |
-
2020
- 2020-05-15 CN CN202010412236.1A patent/CN111596457A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20130083383A1 (en) * | 2010-08-23 | 2013-04-04 | Hartmut Schneider | Mirror module |
| US20160356984A1 (en) * | 2012-05-07 | 2016-12-08 | Panasonic Intellectual Property Management Co., Ltd. | Optical element |
| CN109669253A (en) * | 2019-01-31 | 2019-04-23 | 中国科学院西安光学精密机械研究所 | Large caliber reflecting mirror vibration damping flexible support structure and mirror assembly |
| CN110082904A (en) * | 2019-05-31 | 2019-08-02 | 中国科学院国家天文台南京天文光学技术研究所 | High-precision and stability suitable for space environment put lens device and its working method |
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Application publication date: 20200828 |
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