CN112596198A - Curvature error adjusting device and method for large-diameter spliced reflector - Google Patents
Curvature error adjusting device and method for large-diameter spliced reflector Download PDFInfo
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- CN112596198A CN112596198A CN202011580613.9A CN202011580613A CN112596198A CN 112596198 A CN112596198 A CN 112596198A CN 202011580613 A CN202011580613 A CN 202011580613A CN 112596198 A CN112596198 A CN 112596198A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/18—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors
- G02B7/182—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors for mirrors
- G02B7/185—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors for mirrors with means for adjusting the shape of the mirror surface
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Abstract
The invention relates to the technical field of active optics, in particular to a curvature error adjusting device and method of a large-caliber splicing type reflector; the invention comprises a central push-pull mechanism for pushing and pulling the center of the back of the reflector and a peripheral push-pull mechanism for pushing and pulling the periphery of the back of the reflector opposite to the acting force of the central push-pull mechanism; the central push-pull mechanism comprises an actuator, a flexible joint below the actuator and a connecting piece above the actuator, and the flexible joint below the actuator is adhered to the center of the back of the reflector; the peripheral push-pull mechanism comprises a connecting rod, and a flexible joint above the connecting rod and a flexible joint below the connecting rod; the invention applies acting force to the center of the back surface of the reflector by adopting the actuator, and the connecting rod provides reverse acting force for the periphery of the back surface of the reflector, so that the mirror surface of the reflector generates rotationally symmetrical elastic deformation, and the curvature error of the mirror surface of the reflector is adjusted by the elastic deformation, thereby completing confocal phase sharing between the sub-reflectors.
Description
Technical Field
The invention relates to the technical field of active optics, in particular to a curvature error adjusting device and method for a large-caliber splicing type reflector.
Background
The splicing type reflector technology is an economic and effective technical means for solving the problems that a large-caliber reflector is difficult to process and carry, and has important significance in the development process of a large-caliber optical system.
The sub-reflectors are processed in batches, and the processing errors enable certain surface shape errors to exist among the sub-reflectors, so that the active adjustment of the surface shape errors is critical in the splicing process of the sub-reflectors; the existing active adjustment mainly focuses on the adjustment of the degree of freedom of the reflector, and the adjustment method has certain limitation because the surface shape of the reflector is not directly adjusted.
Disclosure of Invention
The invention mainly solves the technical problem of providing a curvature error adjusting device of a large-caliber splicing type reflector, which applies acting force to the center of the back surface of the reflector by adopting an actuator, and a connecting rod provides reverse acting force for the periphery of the back surface of the reflector, so that the mirror surface of the reflector generates rotationally symmetric elastic deformation, and the curvature error of the mirror surface of the reflector is adjusted by the elastic deformation; also provides a curvature error adjusting method of the large-caliber splicing type reflector.
In order to solve the technical problems, the invention adopts a technical scheme that: the curvature error adjusting device of the large-caliber splicing type reflector comprises a center push-pull mechanism and a periphery push-pull mechanism, wherein the center push-pull mechanism is used for pushing and pulling the center of the back of the reflector, and the periphery push-pull mechanism is used for pushing and pulling the periphery of the back of the reflector opposite to the acting force of the center push-pull mechanism; the central push-pull mechanism comprises an actuator, and an actuator lower flexible joint and an actuator upper connecting piece which are connected with the actuator, wherein the actuator lower flexible joint is adhered to the center of the back of the reflector, and the actuator can drive the actuator lower flexible joint to move; the periphery push-pull mechanism comprises a connecting rod, and a connecting rod upper flexible joint and a connecting rod lower flexible joint which are connected with the connecting rod, wherein the connecting rod lower flexible joint is adhered to the periphery of the back of the reflector, and the connecting rod upper flexible joint is connected with the actuator upper connecting piece.
As an improvement of the invention, the flexible joint above the connecting rod is provided with two end heads, and each end head can be connected with one connecting rod.
As a further improvement of the present invention, a contact plane of the lower flexible joint of the link with the mirror is on the same horizontal plane as a contact plane of the lower flexible joint of the actuator with the mirror.
As a further improvement of the invention, a gasket is arranged between the connecting rod lower flexible joint and the connecting rod.
As a further improvement of the invention, the lower flexible joint of the connecting rod is connected with the connecting rod through a screw.
As a further improvement of the invention, the actuators are connected with the actuator lower flexible joint and the actuator upper connecting piece through screws.
As a further improvement of the invention, both ends of the connecting rod are provided with symmetrical screw holes.
As a further improvement of the present invention, the actuator is a piezoelectric actuator.
As a further improvement of the present invention, the number of the connecting rods and the number of the flexible sections below the connecting rods are six, and the number of the flexible sections above the connecting rods is three.
A curvature error adjusting method of a large-caliber splicing type reflector comprises the following steps:
step S1, connecting the two ends of the actuator with the flexible joint below the actuator and the connecting piece above the actuator respectively,
step S2, bonding the flexible joint below the actuator at the center of the back of the reflector;
step S3, connecting two ends of the connecting rod with an upper flexible joint and a lower flexible joint of the connecting rod respectively;
step S4, connecting the upper flexible joint of the connecting rod with the upper connecting piece of the actuator, bonding the lower flexible joint of the connecting rod on the periphery of the back of the reflector, and simultaneously enabling the contact plane of the lower flexible joint of the connecting rod and the reflector and the contact plane of the lower flexible joint of the actuator and the reflector to be on the same horizontal plane;
step S5, the actuator is operated to apply a force to the center of the mirror back surface and to apply a reaction force to the periphery of the mirror back surface via the flexible joint below the link, thereby adjusting the curvature of the mirror.
The invention has the beneficial effects that: compared with the prior art, the invention applies acting force to the center of the back surface of the reflector by adopting the actuator, and the connecting rod provides reverse acting force for the periphery of the back surface of the reflector, so that the mirror surface of the reflector generates rotationally symmetric elastic deformation, and the curvature error of the mirror surface of the reflector is adjusted by the elastic deformation, thereby completing confocal and common phase between the sub-reflectors.
Drawings
FIG. 1 is a schematic structural diagram according to a first embodiment of the present invention;
FIG. 2 is a diagram illustrating a mirror deformation according to an embodiment;
FIG. 3 is a diagram illustrating a top flexible joint modification of a connecting rod according to an embodiment;
FIG. 4 is a diagram illustrating a variation of the lower flexible joint of the connecting rod according to an embodiment;
FIG. 5 is a block diagram of the curvature error adjustment method of the present invention;
reference numerals: 1-actuator, 11-actuator lower flexible joint, 12-actuator upper connecting piece, 13-screw, 14-actuator force application direction in the embodiment; 15-force application direction of the flexible joint below the connecting rod in the embodiment; 16-direction of mirror deformation in the example; 17-deformation of flexible section above connecting rod in the embodiment rotates the central axis; 18-direction of rotation of deformation of upper flexible link of the embodiment; 19-center axis of rotation of deformation of the flexible joint below the connecting rod in the embodiment; 20-direction of rotation of deformation of the flexible joint below the connecting rod in the embodiment; 2-connecting rod, 21-upper flexible joint of connecting rod, 22-lower flexible joint of connecting rod, 3-spacer, 4-reflector, 5-upper moving part of lower flexible joint of connecting rod in the embodiment; 6-the motion part below the upper flexible joint of the connecting rod in the embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
Referring to fig. 1 to 4, the curvature error adjusting device of a large-diameter splicing mirror according to the present invention includes a center push-pull mechanism for pushing and pulling the center of the back surface of the mirror 4 and a periphery push-pull mechanism for pushing and pulling the periphery of the back surface of the mirror 4 in a direction opposite to the force of the center push-pull mechanism.
In the invention, the central push-pull mechanism comprises an actuator 1, and an actuator lower flexible joint 11 and an actuator upper connecting piece 12 which are connected with the actuator 1, wherein the actuator lower flexible joint 11 is adhered to the center of the back surface of the reflector 4, and the actuator 1 can drive the actuator lower flexible joint 11 to move.
In the present invention, the peripheral push-pull mechanism includes a link 2, and a link upper flexible joint 21 and a link lower flexible joint 22 connected to the link 2, the link lower flexible joint 21 is bonded to the periphery of the back surface of the mirror 4, and the link upper flexible joint 21 is connected to the actuator upper connecting member 12.
In the invention, two end heads are arranged on the upper flexible joints of the connecting rods 2, and each end head can be connected with one connecting rod 2, so that in the invention, 6 connecting rods 2 with equal length can be arranged, namely, the number of the connecting rods 2 and the number of the connecting rod lower flexible joints 22 are six, the number of the connecting rod upper flexible joints 21 is three, and the centers of the six connecting rod lower flexible joints 22 are distributed on the back circumference of the reflector 4 at equal intervals.
In the present invention, the contact plane between the lower flexible joint 22 of the link and the mirror 4 and the contact plane between the lower flexible joint 11 of the actuator and the mirror 4 are located on the same horizontal plane, so as to maintain a horizontal plane, and facilitate adjustment, thereby ensuring that the acting force and the reacting force applied to the mirror 4 are located on the same plane.
In the present invention, the spacer 3 is provided between the lower link flexible segment 22 and the link 2, and can be mainly fine-tuned during the assembly of the mechanism, so as to ensure that the centers of the six lower link flexible segments 21 are on the same circumference, and the center of the circumference is on the central axis of the lower actuator flexible segment 11.
In the invention, the lower flexible joint 22 of the connecting rod is connected with the connecting rod 2 through a screw 13, the actuator 1 is connected with the lower flexible joint 11 of the actuator and the upper connecting piece 12 of the actuator through screws, and two ends of the connecting rod 2 are provided with symmetrical screw holes, so that the connection is more stable.
Within the present invention, the actuator 1 is a piezoelectric actuator.
As shown in fig. 1, the present invention provides an embodiment in which the piezoelectric actuator 1 is connected to the actuator lower flexible joint 11 by a screw 13, the actuator lower flexible joint 11 is glued to the center of the mirror 4, the actuator upper connecting piece 12 is connected to the piezoelectric actuator 1 by a screw, and the other end thereof is connected to the three link upper flexible joints 21 by a screw; six isometric connecting rods 2 pass through the screw and link to each other with three connecting rod top flexible section 21, and its other end passes through the screw rod and links to each other with six connecting rod below flexible sections 22 through gasket 3, and six connecting rod below flexible sections 22 circumference distribution are glued in speculum 4.
As shown in fig. 2, when the piezoelectric actuator 1 outputs a force in the direction of reference numeral 14 to the center of the mirror 4 when the curvature of the mirror 4 is reduced, the link lower flexible joint 22 applies a reaction force in the direction of reference numeral 15 to the edge of the mirror 4, so that the center of the mirror 4 is bulged in the direction of reference numeral 14 and the edge is bent in the direction of reference numeral 16.
In the present embodiment, the piezoelectric actuator 1 is a mechanism that provides an output force using the piezoelectric effect of piezoelectric ceramics.
In the present embodiment, the three link upper flexible links 21 are deformed in the same manner, and as shown in fig. 3, the lower portion of the link upper flexible link 21 is deformed in the direction indicated by reference numeral 18 with the axis 17 as an axis.
In the present embodiment, the six lower link flexible segments 22 are deformed in the same manner, and as shown in fig. 4, the upper portion of the upper link flexible segment 21 is deformed in the direction indicated by reference numeral 20 about the axis 19.
In this embodiment, the actuator lower flexure 11 may deflect the force direction due to assembly errors or other errors, eventually correcting it to be perpendicular to the mirror back.
When the curvature of the mirror 4 is increased, the output force of the piezoelectric actuator 1 to the center of the mirror 4 is in the opposite direction of the direction reference numeral 14, and the movement and deformation directions of the components in the present invention are opposite to those in the embodiment.
As shown in fig. 5, a curvature error adjusting method of a large-aperture splicing type reflector includes the following steps:
step S1, connecting the two ends of the actuator with the flexible joint below the actuator and the connecting piece above the actuator respectively,
step S2, bonding the flexible joint below the actuator at the center of the back of the reflector;
step S3, connecting two ends of the connecting rod with an upper flexible joint and a lower flexible joint of the connecting rod respectively;
step S4, connecting the upper flexible joint of the connecting rod with the upper connecting piece of the actuator, bonding the lower flexible joint of the connecting rod on the periphery of the back of the reflector, and simultaneously enabling the contact plane of the lower flexible joint of the connecting rod and the reflector and the contact plane of the lower flexible joint of the actuator and the reflector to be on the same horizontal plane;
step S5, the actuator is operated to apply a force to the center of the mirror back surface and to apply a reaction force to the periphery of the mirror back surface via the flexible joint below the link, thereby adjusting the curvature of the mirror.
The invention has the following advantages:
1. the piezoelectric actuator 1 and the six equal-length connecting rods 2 can apply acting force and reacting force to the reflector 4, so that the curvature error of the reflector 4 is directly adjusted;
2. the adjustable spacer 3 is arranged between the equal-length connecting rod 2 and the flexible joint 22 below the connecting rod, so that errors generated in the assembling and manufacturing processes are adjusted;
3. the plane surfaces of the connecting rod lower flexible joint 22, the actuator lower flexible joint 11 and the reflector 4 are the same plane, so that the influence of the moment generated when the force application point is not on different planes on the deformation of the reflector surface is avoided;
4. according to the invention, the actuator lower flexible joint 11 is arranged between the piezoelectric actuator 1 and the reflector 4, so that the direction of acting force caused by assembly errors or other errors can be deviated, and finally the acting force is corrected to be vertical to the back surface of the reflector.
5. The invention only uses one piezoelectric actuator 1, so the mechanism is simple, the operation is simple, and the cost performance is high.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes performed by the present specification and drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. A curvature error adjusting device of a large-caliber splicing type reflector is characterized by comprising a center push-pull mechanism and a periphery push-pull mechanism, wherein the center push-pull mechanism is used for pushing and pulling the center of the back of the reflector; the central push-pull mechanism comprises an actuator, and an actuator lower flexible joint and an actuator upper connecting piece which are connected with the actuator, wherein the actuator lower flexible joint is adhered to the center of the back of the reflector, and the actuator can drive the actuator lower flexible joint to move; the periphery push-pull mechanism comprises a connecting rod, and a connecting rod upper flexible joint and a connecting rod lower flexible joint which are connected with the connecting rod, wherein the connecting rod lower flexible joint is adhered to the periphery of the back of the reflector, and the connecting rod upper flexible joint is connected with the actuator upper connecting piece.
2. A curvature error adjusting device of a large-aperture splicing reflector according to claim 1, wherein the upper flexible section of the connecting rod is provided with two ends, and each end can be connected with one connecting rod.
3. A curvature error adjusting device of a large-diameter splicing mirror according to claim 2, wherein a contact plane of the lower flexible section of the connecting rod with the mirror and a contact plane of the lower flexible section of the actuator with the mirror are on the same horizontal plane.
4. A curvature error adjusting device of a large-aperture splicing reflector according to claim 3, wherein a gasket is arranged between the flexible joint below the connecting rod and the connecting rod.
5. A curvature error adjusting device of a large-caliber splicing type reflector according to claim 4, wherein the lower flexible joint of the connecting rod is connected with the connecting rod through a screw.
6. A curvature error adjusting device of a large-caliber splicing type reflecting mirror according to claim 5, wherein the actuator is connected with the lower flexible joint of the actuator and the upper connecting piece of the actuator through screws.
7. A curvature error adjusting device of a large-caliber splicing reflector according to claim 5, wherein two ends of the connecting rod are provided with symmetrical screw holes.
8. A curvature error adjusting apparatus for a large-diameter tiled mirror according to claim 7, wherein the actuator is a piezoelectric actuator.
9. A curvature error adjusting device of a large-aperture splicing reflector according to claim 8, wherein the number of the connecting rods and the flexible sections below the connecting rods is six, and the number of the flexible sections above the connecting rods is three.
10. A curvature error adjusting method of a large-caliber splicing type reflector is characterized by comprising the following steps:
step S1, connecting the two ends of the actuator with the flexible joint below the actuator and the connecting piece above the actuator respectively,
step S2, bonding the flexible joint below the actuator at the center of the back of the reflector;
step S3, connecting two ends of the connecting rod with an upper flexible joint and a lower flexible joint of the connecting rod respectively;
step S4, connecting the upper flexible joint of the connecting rod with the upper connecting piece of the actuator, bonding the lower flexible joint of the connecting rod on the periphery of the back of the reflector, and simultaneously enabling the contact plane of the lower flexible joint of the connecting rod and the reflector and the contact plane of the lower flexible joint of the actuator and the reflector to be on the same horizontal plane;
step S5, the actuator is operated to apply a force to the center of the mirror back surface and to apply a reaction force to the periphery of the mirror back surface via the flexible joint below the link, thereby adjusting the curvature of the mirror.
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| CN202011580613.9A CN112596198B (en) | 2020-12-28 | 2020-12-28 | Curvature error adjusting device and method for large-caliber spliced reflector |
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| CN202011580613.9A CN112596198B (en) | 2020-12-28 | 2020-12-28 | Curvature error adjusting device and method for large-caliber spliced reflector |
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| CN113900217A (en) * | 2021-09-30 | 2022-01-07 | 中国科学院长春光学精密机械与物理研究所 | Concatenation formula speculum camber adjustment mechanism |
| CN117741904A (en) * | 2024-02-19 | 2024-03-22 | 中国科学院长春光学精密机械与物理研究所 | Bolt pre-tightening device for reflecting mirror assembly |
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| CN117741904B (en) * | 2024-02-19 | 2024-04-16 | 中国科学院长春光学精密机械与物理研究所 | Bolt pre-tightening device for reflecting mirror assembly |
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