CN117608050A - Flexible axial positioning device for mounting large-caliber optical element - Google Patents
Flexible axial positioning device for mounting large-caliber optical element Download PDFInfo
- Publication number
- CN117608050A CN117608050A CN202311769026.8A CN202311769026A CN117608050A CN 117608050 A CN117608050 A CN 117608050A CN 202311769026 A CN202311769026 A CN 202311769026A CN 117608050 A CN117608050 A CN 117608050A
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- flexible
- mounting
- screw
- optical element
- axial positioning
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- 230000003287 optical effect Effects 0.000 title claims abstract description 49
- 238000009434 installation Methods 0.000 claims abstract description 23
- 239000004429 Calibre Substances 0.000 claims description 4
- 238000006073 displacement reaction Methods 0.000 claims description 2
- 238000000034 method Methods 0.000 abstract description 12
- 230000007246 mechanism Effects 0.000 description 7
- -1 polytetrafluoroethylene Polymers 0.000 description 7
- 229920001343 polytetrafluoroethylene Polymers 0.000 description 7
- 239000004810 polytetrafluoroethylene Substances 0.000 description 7
- 238000013461 design Methods 0.000 description 4
- 238000013519 translation Methods 0.000 description 3
- 238000001514 detection method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Classifications
-
- 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
- G02B7/183—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors for mirrors specially adapted for very large mirrors, e.g. for astronomy, or solar concentrators
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
- G02B23/02—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices involving prisms or mirrors
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B23/00—Telescopes, e.g. binoculars; Periscopes; Instruments for viewing the inside of hollow bodies; Viewfinders; Optical aiming or sighting devices
- G02B23/16—Housings; Caps; Mountings; Supports, e.g. with counterweight
-
- 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
- G02B7/1821—Mountings, adjusting means, or light-tight connections, for optical elements for prisms; for mirrors for mirrors for rotating or oscillating mirrors
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Astronomy & Astrophysics (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Mounting And Adjusting Of Optical Elements (AREA)
Abstract
The invention discloses a flexible axial positioning device for mounting a large-caliber optical element, which comprises a nut, a screw rod, a flexible axial positioning piece and a tray, wherein the nut is fixedly arranged in a mirror chamber, the screw rod is arranged in the nut in a threaded fit manner, the screw rod can be driven to move along a Z axis by rotating the screw rod, the top end of the screw rod is provided with a mounting groove, the flexible axial positioning piece is arranged in the mounting groove, the flexible axial positioning piece only has axial rigidity and only restricts linear movement along the axial direction, one side of the tray is connected with the flexible axial positioning piece, and the other side of the tray is used for supporting the large-caliber optical element. The invention eliminates the constraint on three degrees of freedom of Tx, ty and Rz existing in the conventional ball head screw by utilizing the double-head flexible rod or the double-end flexible joint, and can realize the full-kinematic positioning of the large-caliber lens body in the installation and positioning process by arranging three flexible axial positioning devices to only restrict the three degrees of freedom of Rx, ry and Tz of the lens body and matching with other devices.
Description
Technical Field
The invention belongs to the technical field of optical system adjustment, relates to a positioning device for installing a large-caliber optical element, and particularly relates to a flexible axial positioning device for installing the large-caliber optical element.
Background
With the development of astronomy and observation technology, the caliber of the optical element is larger and larger, and the precision is higher and higher, so as to improve the observation resolution and increase the detection distance. When the large-caliber optical system is assembled and adjusted, the large-caliber optical element is required to be installed in the lens chamber, and after the corresponding supporting and positioning mechanism is installed, precise detection and adjustment are performed until the large-caliber optical element is adjusted to be in a use state. When in installation, the optical element is required to be fully constrained relative to 6 degrees of freedom of the mirror chamber, and over constraint and under constraint are not existed, so that the correct installation pose is ensured, and the safety of the mirror body is also ensured. The traditional installation method of the large-caliber optical element is a method of 'a central hole and a mandrel', the method can only restrict 5 degrees of freedom of movement except rotation around the mandrel, under-restriction conditions exist, the pose of the large-caliber optical element relative to the lens chamber can not be completely and precisely determined, and the installation precision requirement of the large-caliber optical element can not be met. In order to solve the above problems, the design is based on the principle of kinematics, and the 6 degrees of freedom of the mirror body are divided into two types, namely, translation along the X/Y axis and rotation around the Z axis, and translation along the Z axis and rotation around the X/Y axis. The first type of freedom is generally realized by adopting a sliding pin and positioning pad method, and the second type of freedom is constrained by adopting 3 axial screws. The single axial screw cannot release the first type of freedom, so that the installation and positioning process is over-constrained. The method of adding a two-dimensional translation link in the screw rod can release the first degree of freedom to a certain extent, but the mechanism needs to be adjusted in real time, and the installation and the positioning are complex.
Disclosure of Invention
The present invention provides a flexible axial positioning device for mounting large-caliber optical elements, which solves the above-mentioned problems in the prior art.
In order to achieve the above purpose, the present invention provides the following technical solutions:
the utility model provides a flexible axial positioner for heavy-calibre optical element installation, includes nut, screw rod, flexible axial setting element, tray, nut fixed mounting is in the mirror room, screw rod screw thread cooperation is installed in the nut, can drive the screw rod along Z axle motion through rotatory screw rod, the top of screw rod is provided with the mounting groove, flexible axial setting element installs in the mounting groove, flexible axial setting element only has axial rigidity, only restraines along axial linear motion, one side of tray with flexible axial setting element links to each other, and the opposite side is used for supporting heavy-calibre optical element.
Further, the flexible axial positioning piece comprises a connecting shaft, an upper end ball joint bearing, a lower end ball joint bearing and an auxiliary positioning screw, one end of the connecting shaft is installed in an installation groove of the screw rod through the lower end ball joint bearing, the other end of the connecting shaft is connected with the tray through the upper end ball joint bearing, and the auxiliary positioning screw is installed on the side wall of the installation groove and used for assisting in determining that the axis of the connecting shaft is consistent with the axis of the screw rod in an initial state.
Further, the bottom of tray is provided with the kerve, upper end ball joint bearing is located the kerve and links to each other with the lateral wall inboard of kerve, auxiliary set screw's top supports the lateral wall outside in the kerve.
Further, a gap is formed between one end of the connecting shaft and the bottom of the mounting groove of the screw rod and between the other end of the screw rod and the bottom of the tray, and the gap width of the gap is smaller than 5mm.
Further, the flexible axial locating piece comprises a flexible joint and a plane thrust bearing, an orthogonal flexible groove structure is arranged on the flexible joint, a central locating hole is formed in the bottom of a mounting groove of the screw, one end of the flexible joint is mounted in the mounting groove of the screw through the plane thrust bearing and the central locating hole, and the other end of the flexible joint is connected with the tray through a boss.
Further, the orthogonal flex groove structure imparts stiffness to the flex joint in and about its axis, releasing stiffness about its axis through a planar thrust bearing mounted at one end thereof, such that the flexible axial positioning member only constrains linear motion in the axial direction.
Further, two ends of the flexible joint are respectively provided with a set of orthogonal flexible groove structures.
Further, a gap is formed between the end face of the installation groove of the screw rod and the bottom of the tray, and the gap width of the gap is smaller than 5mm.
Further, a buffer pad is arranged on the end face of the tray, and the buffer pad is contacted with the bottom of the large-caliber optical element.
Further, the three sets of flexible axial positioning devices are distributed at 120 degrees along the circumferential direction, and the three sets of flexible axial positioning devices can only restrict three degrees of freedom of movement of the large-caliber optical element relative to the x-direction rotation, the y-direction rotation and the z-direction displacement of the mirror chamber.
Compared with the prior art, the invention has the beneficial effects that:
(1) The invention eliminates the constraint on three degrees of freedom of Tx, ty and Rz existing in the conventional ball head screw by utilizing the double-head flexible rod or the double-end flexible joint, and can realize the full-kinematic positioning of the large-caliber lens body in the installation and positioning process by arranging three flexible axial positioning devices to only restrict the three degrees of freedom of Rx, ry and Tz of the lens body and matching with mechanisms such as spring pins.
(2) The invention utilizes the kinematics principle to control the position and the gesture in the installation of the large-caliber optical element, has no over-constraint and under-constraint conditions, and ensures the safety, the installation precision and the repetition precision in the installation of the large-caliber optical element.
Drawings
FIG. 1 is a schematic view of a ball joint bearing type lifting screw structure
FIG. 2 is a schematic view of a flexible screw structure
FIG. 3 is a schematic perspective view of a flexible joint structure
FIG. 4 is a schematic plan view of a flexible joint structure
FIG. 5 is an isometric view of a mirror housing mounting chamber for a mirror body
FIG. 6 is an isometric view of a mirror body installation
The marks in the figure: 1. the mirror chamber supporting seat, 2, a mirror chamber, 3, a mirror body, 4, a spring pin, 5, a flexible axial positioning device, 5-1, a polytetrafluoroethylene pad, 5-2, an auxiliary positioning screw, 5-3, a lower end ball joint bearing, 5-4, a screw rod, 5-5, a nut, 5-6, a tray, 5-7, an upper end ball joint bearing, 5-8, a connecting shaft, 5-9, a flexible joint, 5-10, a plane thrust bearing, 5-11 and a flexible groove.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings.
The device is based on a kinematic positioning principle, fully utilizes the components such as the flexible joint, the bearing and the like to design an axial positioning mechanism, completely releases the first degree of freedom, and designs a corresponding mounting structure, thereby ensuring that the large-caliber optical element in the mounting process is not positioned excessively and underpositioned relative to the mirror chamber, ensuring the mounting precision and the repetition precision of the large-caliber optical element, and ensuring the safety of the mirror body.
Example 1
This embodiment provides a flexible axial positioning device for large aperture optical element installation as shown in fig. 1. The flexible axial positioning device mainly comprises a nut 5-5, a screw 5-4, a connecting shaft 5-8, an upper spherical joint bearing 5-7, a lower spherical joint bearing 5-3, an auxiliary positioning screw 5-2, a tray 5-6 and a polytetrafluoroethylene pad 5-1. Nuts 5-5 are installed at corresponding installation holes of the mirror housing 2 and fixedly connected with the mirror housing by screws. The screw 5-4 is mounted in the nut 5-5 in a threaded fit, and the screw 5-4 can be driven to move along the Z axis by rotating the screw 5-4. The top of the screw 5-4 is provided with a mounting groove, one end of the connecting shaft 5-8 is mounted in the mounting groove of the screw 5-4 through the lower ball joint bearing 5-7, and the other end is connected with the tray 5-6 through the upper ball joint bearing 5-7. 4 auxiliary positioning screws 5-2 are designed at the mounting holes at the end parts of the screw rods 5-4 and are used for assisting in determining that the axis of the connecting shaft 5-8 is consistent with the axis of the screw rods 5-4 in the initial state. The flexible axial positioning device has only axial rigidity, only restricts linear movement along the axial direction, and the tray is used for supporting the large-caliber optical element. The polytetrafluoroethylene pad 5-1 is arranged on the end face of the tray 5-6, and the plane of the other end of the polytetrafluoroethylene pad is contacted with the bottom of the mirror body 3.
Specifically, the bottom of the tray 5-6 is provided with a bottom groove, the upper ball joint bearing 5-3 is positioned in the bottom groove and connected with the inner side of the side wall of the bottom groove, and the top end of the auxiliary positioning screw 5-2 abuts against the outer side of the side wall of the bottom groove.
In this embodiment, a gap is formed between one end of the connecting shaft and the bottom of the mounting groove of the screw, and between the other end of the screw and the bottom of the tray, and the gap width of the gap is smaller than 5mm. Specifically, as shown in FIG. 1, the distance between the connecting shaft 5-8 and the hole of the screw 5-4 is smaller, the unidirectional distance is only 3-4 mm, the bottom of the tray 5-6 is arranged in the hole of the screw 5-4, the distance between the bottom surface of the tray and the end surface of the screw is only 3mm, and the safety of the mirror body under special conditions is ensured.
In this embodiment, the ball joint bearings are mounted on both ends of the connecting shaft 5-8, and the combination has only rigidity along the axial direction thereof and restricts only linear movement along the axial direction thereof. In addition, the connecting shaft 5-8 is placed in the hole at the end part of the screw 5-4, and the distance between the end surface of the hole and the tray 5-6 is smaller, so that the safety of the mirror body 3 is ensured.
Example two
This embodiment provides a flexible axial positioning device for large aperture optical element installation as shown in fig. 2. The flexible axial positioning device mainly comprises a nut 5-5, a screw 5-4, a flexible joint 5-9, a plane thrust bearing 5-10, a tray 5-6 and a polytetrafluoroethylene pad 5-1. Nuts 5-5 are installed at corresponding installation holes of the mirror housing 2 and fixedly connected with the mirror housing by screws. The screw 5-4 is mounted in the nut 5-5 in a threaded fit, and the screw 5-4 can be driven to move along the Z axis by rotating the screw 5-4. The top of screw rod 5-4 is provided with the mounting groove, is provided with the flexible groove 5-11 structure of quadrature on the flexible festival 5-9, and as shown in fig. 3-4, the bottom of the mounting groove of screw rod 5-4 is provided with central locating hole, and the one end of flexible festival 5-9 passes through plane thrust bearing 5-10 and central locating hole to be installed in the mounting groove of screw rod 5-4, and the other end passes through the boss and links to each other with tray 5-6. The polytetrafluoroethylene pad 5-1 is arranged on the end face of the tray 5-6, and the plane of the other end of the polytetrafluoroethylene pad is contacted with the bottom of the mirror body 3. The flexible axial positioning device has only axial rigidity, only restricts linear movement along the axial direction, and the tray is used for supporting the large-caliber optical element.
As shown in fig. 3-4, the flex joint 5-9 has an orthogonal flex groove 5-11 configuration at both ends thereof, the flex joint having rigidity in and about its axial direction, the planar thrust bearing 5-10 mounted at one end thereof releasing rigidity about its axial direction, so that the configuration restrains only linear movement in its axial direction.
In the embodiment, a gap is formed between the end face of the installation groove of the screw and the bottom of the tray, and the gap width of the gap is smaller than 5mm. Specifically, the flexible joint 5-9 is placed in the hole at the end part of the screw 5-4, and the distance between the end surface of the hole and the tray is only 3mm, so that the safety of the mirror body 3 after the flexible joint 5-9 fails is ensured.
One example of an application of the flexible axial positioning device of the above embodiment is shown in fig. 5-6, in which case the large-caliber optical element mounting positioning device comprises a mirror housing support 1, a mirror housing 2, a mirror body 3, a spring pin 4, and a flexible axial positioning device 5. The 3 groups of supporting seats 1 are uniformly distributed on the bottom surface of the mirror chamber 2 and fixedly connected with the mirror chamber by screws, so that the mirror chamber 2 is ensured to be horizontally placed on the ground. The mirror chamber is a reference part for mounting the large-caliber optical element, the position and the gesture of the optical element relative to the mirror chamber in the mounting process are determined through the spring pin 4 and the flexible axial positioning device 5, and whether the large-caliber optical element is mounted in place is determined through measuring the distance between the bottom surface of the large-caliber optical element and the reference surface of the mirror chamber. Three sets of spring pins 4 uniformly distributed at 120 degrees restrict translational degrees of freedom Tx and Ty of the mirror body 3 along the X axis and the Y axis and rotational degrees of freedom Rz around the Z axis. As shown in fig. 5, three sets of flexible axial positioning devices 5 are respectively installed at the positions of the bottom surface of the mirror chamber 2 corresponding to the mounting holes, the three mounting holes are uniformly distributed at 120 degrees, and meanwhile, the pitch circles of the centers of the three mounting holes are concentric with the center of the mirror chamber.
By adopting the double ball joint bearing or the flexible lifting screw, the rigidity of the flexible lifting screw only along the Z-axis direction is realized, so that three sets of flexible axial positioning devices 5 distributed at 120 degrees can only restrict three degrees of freedom of movement of the mirror body 3 relative to Rx, ry and Tz of the mirror chamber 2. The translational degrees of freedom Tx and Ty of the mirror body 3 along the X axis and the Y axis and the rotational degree of freedom Rz around the Z axis are constrained by adopting three sets of spring pins 4 which are uniformly distributed at 120 degrees. The two sets of mechanisms happen to restrict three translational degrees of freedom and three rotational degrees of freedom of the large-caliber optical element relative to the mirror chamber, the formed kinematic positioning can determine the pose of the mirror body 3 relative to the mirror chamber 2, the positioning process is not over-restricted, and the safety of the mirror body 3 is ensured.
In summary, the invention fully utilizes the components such as the flexible joint and the bearing to design the axial positioning mechanism based on the kinematics positioning principle, combines the lateral positioning mechanism to determine the position and the gesture of the large-caliber optical element relative to the lens chamber in the installation process, does not have the over-positioning and under-positioning conditions in the positioning process, ensures the installation precision and the repetition precision of the large-caliber optical element, and simultaneously ensures the safety of the lens body.
The above description is only of the preferred embodiments of the present invention, and is not intended to limit the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The utility model provides a flexible axial positioner for heavy-calibre optical element installation, its characterized in that includes nut, screw rod, flexible axial setting element, tray, nut fixed mounting is in the mirror room, screw rod screw thread cooperation is installed in the nut, can drive the screw rod along Z axle motion through rotatory screw rod, the top of screw rod is provided with the mounting groove, flexible axial setting element installs in the mounting groove, flexible axial setting element only has axial rigidity, only restraines along axial linear motion, one side of tray with flexible axial setting element links to each other, and the opposite side is used for supporting heavy-calibre optical element.
2. The flexible axial positioning device for mounting a large-caliber optical element according to claim 1, wherein the flexible axial positioning member comprises a connecting shaft, an upper spherical joint bearing, a lower spherical joint bearing and an auxiliary positioning screw, one end of the connecting shaft is mounted in a mounting groove of the screw rod through the lower spherical joint bearing, the other end of the connecting shaft is connected with the tray through the upper spherical joint bearing, and the auxiliary positioning screw is mounted on the side wall of the mounting groove and used for assisting in determining that the axis of the connecting shaft is consistent with the axis of the screw rod in an initial state.
3. A flexible axial positioning device for mounting large-caliber optical elements according to claim 2, wherein the bottom of the tray is provided with a bottom groove, the upper ball joint bearing is positioned in the bottom groove and connected with the inner side of the side wall of the bottom groove, and the top end of the auxiliary positioning screw is propped against the outer side of the side wall of the bottom groove.
4. A flexible axial positioning device for mounting large diameter optical element according to claim 2, wherein there is a gap between one end of the connecting shaft and the bottom of the mounting groove of the screw and between the other end of the screw and the bottom of the tray, the gap having a gap width of less than 5mm.
5. The flexible axial positioning device for mounting a large-caliber optical element according to claim 1, wherein the flexible axial positioning piece comprises a flexible joint and a planar thrust bearing, an orthogonal flexible groove structure is arranged on the flexible joint, a central positioning hole is formed in the bottom of a mounting groove of the screw, one end of the flexible joint is mounted in the mounting groove of the screw through the planar thrust bearing and the central positioning hole, and the other end of the flexible joint is connected with the tray through a boss.
6. A flexible axial positioning device for use in mounting large caliber optical elements according to claim 5, wherein the orthogonal flexible groove structure imparts rigidity to the flexible joint in and about its axial direction, and wherein the planar thrust bearing mounted at one end thereof releases rigidity about its axial direction such that the flexible axial positioning member restrains only linear motion in the axial direction.
7. A flexible axial positioning device for mounting large caliber optical elements according to claim 6, wherein two ends of the flexible joint are respectively provided with a set of orthogonal flexible groove structures.
8. A flexible axial positioning device for mounting large diameter optical elements according to claim 5, wherein a gap is provided between the end face of the mounting groove of the screw and the bottom of the tray, the gap having a gap width of less than 5mm.
9. A flexible axial positioning device for mounting a large diameter optical element according to claim 1, wherein the end surface of the tray is provided with a cushion pad which is in contact with the bottom of the large diameter optical element.
10. A flexible axial positioning device for large aperture optical element mounting as defined in claim 1,
the three sets of flexible axial positioning devices are distributed at 120 degrees along the circumferential direction, and the three sets of flexible axial positioning devices can only restrict three degrees of freedom of movement of the large-caliber optical element relative to the x-direction rotation, the y-direction rotation and the z-direction displacement of the mirror chamber.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311769026.8A CN117608050A (en) | 2023-12-21 | 2023-12-21 | Flexible axial positioning device for mounting large-caliber optical element |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311769026.8A CN117608050A (en) | 2023-12-21 | 2023-12-21 | Flexible axial positioning device for mounting large-caliber optical element |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117608050A true CN117608050A (en) | 2024-02-27 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311769026.8A Pending CN117608050A (en) | 2023-12-21 | 2023-12-21 | Flexible axial positioning device for mounting large-caliber optical element |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117608050A (en) |
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2023
- 2023-12-21 CN CN202311769026.8A patent/CN117608050A/en active Pending
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