CN102854604B - Telescope primary mirror center radial positioning mechanism and assembly and adjustment method thereof - Google Patents
Telescope primary mirror center radial positioning mechanism and assembly and adjustment method thereof Download PDFInfo
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- CN102854604B CN102854604B CN201210312907.2A CN201210312907A CN102854604B CN 102854604 B CN102854604 B CN 102854604B CN 201210312907 A CN201210312907 A CN 201210312907A CN 102854604 B CN102854604 B CN 102854604B
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Abstract
The invention discloses a telescope primary mirror center radial positioning mechanism and an assembly and adjustment method thereof, relating to the technical field of primary mirror support and solving the problem that the existing positioning mechanism cannot accurately position the primary mirror of a telescope. The mechanism is located at a center hole of the primary mirror and comprises a mandrel fixed on a base and a shaft sleeve sleeved outside the mandrel; the shaft sleeve is in glue joint with the primary mirror; a flexible positioning head is fixed on the mandrel and mainly comprises a positioning block and a ring connected together; at least three positioning blocks are uniformly distributed on the ring; the inner surface of each positioning block is a ring convex surface which is in ring line contact with the inclined plane of a wedge block, and the outer surface is an arc surface which is in ring line contact with the inner surface of the shaft sleeve; an adjustment gasket is connected with the ring through a pre-tightening screw and corresponds to each positioning block; the wedge block is mounted at the upper part of the adjustment gasket through a pre-tightening screw, and the inclined plane of the wedge block is in contact with the inner surface of the positioning block; and the part between the positioning block and the ring is a flexible link. The mechanism does not generate over-positioning and additional stress and has high precision.
Description
Technical field
The present invention relates to primary mirror support technology field, be specifically related to a kind of telescope primary mirror radial positioning mechanism of center and Method of Adjustment thereof.
Background technology
Telescope is the important means in astronomical sight, its performance height is determining the size in the cosmic space that people can observe, primary mirror is the key optical element in telescopic system, and its positioning precision and surface precision have directly determined telescopical image quality.Primary mirror center is with center pit, and self is with certain thickness, and thickness matches with sleeve length, and detent mechanism is arranged in the center pit of primary mirror.
In desirable telescope center radial positioning device, axle only plays certralizing ability, minute surface is not produced to extra-stress, and total should be conducive to debug, and does not produce again location and interferes.
Granted publication day is on 02 08th, 2012, and the Chinese invention patent that the patent No. is ZL201010588996.4 discloses a kind of radial positioning mechanism of center of optical element, and this mechanism comprises central shaft, axle sleeve, distensible ring, pretension screw, loosens screw; Described distensible ring is made up of the regulating ring connecting as one and flexible ring; Central shaft is fixed on pedestal, between its top and flexible ring inside surface, coordinates by circular conical surface; The outside surface of flexible ring is cambered surface, and this cambered surface forms loop line with the inside surface of axle sleeve and contacts; Central shaft, flexible ring and axle sleeve are embedded in the center pit of optical element, and the outside surface of axle sleeve and optical element splicing; Regulating ring is connected by pretension screw with central shaft, rotates the distance between pretension screw capable of regulating regulating ring and central shaft, makes flexible ring and central shaft interference fit; Loosen screw and be threaded with regulating ring, its front end pushes up on central shaft, and screw is loosened in adjusting can make flexible ring and central shaft clearance fit.In the time screwing pretension screw, to regulating circulating application to add axial force, the axial distance of itself and central shaft is furthered, thereby make flexible ring swelling and axle sleeve is applied to radial force; Excessive when tension force, when need to loosening, screw and loosen screw, central shaft is applied to axial force, make the axial distance of regulating ring and central shaft become large, coordinating between flexible ring and central shaft loosened.
Above-mentioned detent mechanism is to regulate the cooperation degree of tightness between flexible ring and central shaft by pretension screw, it has following shortcoming: the first, can not ensure that the spreading deflection that flexible ring is made use at each pretension screw equates, also just cannot ensure that flexible ring external diameter equates with sleeve diameter, the difference of each section of spreading amount of flexible ring is easily introduced extra-stress to primary mirror; The second, the cooperation that can not accurately control flexible ring and central shaft is interference fit or clearance fit, has the problem of not only locating but also supporting, and the positioning precision to primary mirror and surface precision all can affect.
Summary of the invention
Can not implement pinpoint problem to telescope primary mirror in order to solve existing detent mechanism, the invention provides a kind of telescope primary mirror radial positioning mechanism of center and Method of Adjustment thereof.
The present invention for the technical scheme that technical solution problem adopts as follows:
A kind of telescope primary mirror radial positioning mechanism of center, this mechanism is positioned at the center pit of primary mirror, comprising:
Be fixed on the axle on pedestal;
Be sleeved on the axle sleeve of axle outside;
Between axle sleeve and primary mirror, be splicing,
Also comprise: flexible positioning head, wedge and adjustment pad,
Described flexible positioning head is fixed in axle, is mainly made up of the locating piece linking into an integrated entity and annulus;
Described at least three locating pieces are distributed on annulus, and its inside surface is annulus convex surface, and between the inclined-plane of wedge for loop line contacts, outside surface is arc surface, and between axle sleeve inside surface for loop line contacts;
Described adjustment pad is connected with annulus by pretension screw and is corresponding with each locating piece, and described wedge is arranged on the top of adjusting pad by pretension screw, and its inclined-plane contacts with the inside surface of locating piece;
Part between described locating piece and described annulus is flexible link, and micro-deformation can occur.
Described axle, axle sleeve, flexible positioning head, wedge and adjustment pad all adopt low thermal expansion metal.
The number of described locating piece is six.
On described wedge, be provided with and pretension screw and the screw that loosens screw fit.
The Method of Adjustment of telescope primary mirror radial positioning mechanism of center, the concrete steps of this Method of Adjustment are as follows:
Use simulation annulus and turntable as auxiliary adjustment equipment, the external diameter of simulation annulus is identical with sleeve diameter, first simulation annulus is connected on turntable, coaxial with turntable by observing the first micrometer head reading adjustment simulation annulus, keep the first micrometer head invariant position and record its reading;
Unload Imitating annulus, load onto axle, coaxial with turntable by observing the second micrometer head reading adjustment axle, second micrometer head of dismantling;
Be loaded on flexible positioning head and wedge, the first micrometer head is contacted with the exterior arc surface of each locating piece respectively, adjust the position of wedge, the reading that makes the first micrometer head is with to adjust the reading of simulation annulus when coaxial with turntable identical, and now the contact outside diameter of flexible positioning head is identical with sleeve diameter;
Record now arrives the distance between the annulus of flexible positioning head bottom in each wedge bottom, and carry out mark, according to the thickness of the each adjustment pad of these value reconditionings, finally each parts good above-mentioned adjusted are pulled down from turntable, in the center pit of primary mirror, each parts are installed to relevant position according to corresponding relation.
The invention has the beneficial effects as follows: telescope primary mirror radial positioning mechanism of center of the present invention is by by outside dimension and the measure-alike simulation annulus of sleeve diameter, the contact outside diameter of adjusting flexible positioning head is identical with the internal diameter of axle sleeve, the actual (real) thickness of the each adjustment pad of reconditioning, determine the axial location of wedge by adjusting pad, after the good pad of reconditioning, no longer wedge upper-lower position is adjusted, realized that radial positioning mechanism is disposable to be in place; Between the inclined-plane of flexible positioning head and wedge and axle sleeve inside surface, be line and contact, avoided the generation of mistake positioning phenomenon in face contact, make not produce interference fit between flexible positioning head and axle sleeve, avoided, in the time assembling, primary mirror is introduced to extra-stress; Flexible positioning head distending only produces radial motion, only plays radial location effect, has avoided the uppity defect of pretension screw moment size on wedge, minute surface is not introduced to additional axial stress, can not introduce aberration to optical system, and precision is higher.
Telescope primary mirror radial positioning mechanism of center of the present invention is applicable to all telescope primary mirror center radial locations with center pit, and because modern telescope adopts reflective optical structure more, primary mirror multi-band has center pit, therefore practicality of the present invention is very strong.
This mechanism in use only locates and does not support, and meets desirable center location structure principle of design.
Brief description of the drawings
Fig. 1 is the front view of telescope primary mirror radial positioning mechanism of center of the present invention;
Fig. 2 is the partial enlarged drawing in Fig. 1;
Fig. 3 is the vertical view in Fig. 1;
Fig. 4 is the structural representation of flexible positioning head;
Fig. 5 is the assembling schematic diagram of telescope primary mirror radial positioning mechanism of center of the present invention;
Fig. 6 adjusts the simulation annulus schematic diagram coaxial with turntable;
Fig. 7 adjusts the flexible positioning head contact outside diameter schematic diagram identical with sleeve diameter.
In figure: 1, axle, 2, axle sleeve, 3, flexible positioning head, 3-1, locating piece, 3-2, annulus, 3-3, flexible link, 4, wedge, 5, adjust pad, 6, pretension screw, 7, simulation annulus, 8, primary mirror, 9, turntable, 10, pedestal, 11, the first micrometer head, 12, the second micrometer head.
Embodiment
Below in conjunction with accompanying drawing, the present invention is described in further detail.
A kind of telescope primary mirror radial positioning mechanism of center of the present invention, as shown in Figure 1, this mechanism is positioned at the center pit of primary mirror 8, mainly comprise axle 1, axle sleeve 2, flexible positioning head 3, wedge 4, adjust pad 5 and pretension screw 6, axle 1 is fixed on pedestal 10, and axle sleeve 2 is sleeved on axle 1 outside, between leave space, between axle sleeve 2 and primary mirror 8, for glueing joint, flexible positioning head 3 is arranged in axle 1;
As shown in Figure 4, flexible positioning head 3 is mainly made up of locating piece 3-1 and annulus 3-2, six locating piece 3-1 be distributed on annulus 3-2 surface and and annulus 3-2 link into an integrated entity, locating piece 3-1 inside surface is annulus convex surface, and between the inclined-plane of wedge 4 for loop line contacts, locating piece 3-1 outside surface is arc surface, and between axle sleeve 2 inside surfaces for loop line contacts; Annulus 3-2 surface arranges porose, by hole and coordinating of screw flexible positioning head 3 entirety being fixed in axle 1; Between locating piece 3-1 and annulus 3-2, thinner part is flexible link 3-3, and micro-deformation can occur;
As shown in Figure 5, on wedge 4, be provided with and pretension screw 6 and the screw that loosens screw fit, wedge 4 inside surfaces coordinate with axle 1 outside surface, the centre position of adjusting pad 5 is provided with the screw coordinating with pretension screw 6, wedge 4 is all connected with the annulus 3-2 on flexible positioning head 3 by pretension screw 6 with adjustment pad 5, adjust the lower end that pad 5 is positioned at wedge 4, first install and adjust pad 5 on annulus 3-2, wedge 4 is being installed on adjustment pad 5, rotation pretension screw 6 and the position of loosening screw capable of regulating wedge 4, thereby adjust each wedge 4 positions and make radially distending of flexible positioning head 3, the contact outside diameter of flexible positioning head 3 is identical with axle sleeve 2 internal diameters, can ensure when assembling flexible positioning head 3 and axle sleeve 2 between do not produce interference fit, avoid primary mirror 8 to introduce extra-stress.
Axle 1, axle sleeve 2, flexible positioning head 3, wedge 4 and adjust pad 5 and all adopt low thermal expansion metal, can avoid temperature variation time and primary mirror 8 expansion coefficient have big difference and cause large thermal stress.
The Method of Adjustment of telescope primary mirror radial positioning mechanism of center of the present invention comprises: demarcation and the set-up procedure in early stage, comprise the demarcation of axle 1 position, and the demarcation of flexible positioning head 3 positions, adjusts the reconditioning of pad 5;
The concrete steps of this Method of Adjustment are as follows:
The demarcation of axle 1 position: as shown in Figure 6, adopt simulation annulus 7 and turntable 9 as auxiliary adjustment equipment, the external diameter Φ d of simulation annulus 7 is identical with axle sleeve 2 internal diameter Φ D, position to simulation annulus 7 is demarcated, first simulation annulus 7 is connected by screw on turntable 9, adjust the position of the first micrometer head 11, make the first micrometer head 11 identical with axle sleeve 2 inside surface contact positions with flexible positioning head 3 with simulation annulus 7 outside surface contact positions, fix the first micrometer head 11, observe the first micrometer head 11 reading adjustment simulation annulus 7 coaxial with turntable 9, now, the first micrometer head 11 readings are designated as d1, as shown in Figure 7, keep the first micrometer head 11 invariant positions, unload Imitating annulus 7, load onto axle 1, adjust the position of the second micrometer head 12, it is contacted with axle outside surface, observe the second micrometer head 12 readings, until its reading is constant, can think that now axle 1 is coaxial with turntable 9, stationary spindle 1,
The demarcation of flexible positioning head 3 positions: second micrometer head 12 of dismantling, load onto successively more flexible positioning head 3, adjust pad 5 and wedge 4, make the first micrometer head 11 contact successively cylindrical contact with each locating piece 3-1, observe the first micrometer head 11 readings, adjust each wedge 4 positions and make radially distending of flexible positioning head 3, six readings that make the first micrometer head 11 are all d1, now, the contact outside diameter of flexible positioning head 3 is identical with axle sleeve 2 internal diameters, can ensure when assembling flexible positioning head 3 and axle sleeve 2 between do not produce interference fit, avoid primary mirror 8 to introduce extra-stress,
Adjust the reconditioning of pad 5: first wedge 4 bottoms are demarcated to the distance of flexible positioning head 3 bottom annulus 3-2, as shown in Figure 7, accurately measured each wedge 4 bottoms to the distance L between flexible positioning head 3 bottom annulus 3-2
i, wherein i=1,2 ... 6, and carry out mark; Six measured value L
i(i=1,2 ... 6) between, there is certain difference, by the thickness of these six the each adjustment pads 5 of value reconditioning;
Finally each parts good above-mentioned adjusted are pulled down from turntable 9, in the center pit of primary mirror 8, each parts are installed to relevant position according to corresponding relation, realize that radial positioning mechanism of center is disposable to be in place, reconditioning is no longer adjusted after adjusting well the thickness of pad 5, can realize disposable debuging, it is identical with axle sleeve 2 internal diameters that the flexible positioning head 3 of strict guarantee contacts outside diameter, and flexible positioning head 3 radially only produces radial motion when distending, minute surface is not introduced to extra-stress, precision is higher.
Claims (4)
1. a telescope primary mirror radial positioning mechanism of center, this mechanism is positioned at the center pit of primary mirror (8), comprising:
Be fixed on the axle (1) on pedestal (10);
Be sleeved on the outside axle sleeve (2) of axle (1);
Between axle sleeve (2) and primary mirror (8), be splicing,
It is characterized in that, also comprise: flexible positioning head (3), wedge (4) and adjustment pad (5), it is upper that described flexible positioning head (3) is fixed on axle (1), is mainly made up of the locating piece linking into an integrated entity (3-1) and annulus (3-2);
At least three locating pieces (3-1) are distributed on annulus (3-2), its inside surface is annulus convex surface, and, for loop line contacts, outside surface is arc surface between the inclined-plane of wedge (4), and between axle sleeve (2) inside surface for loop line contacts;
Described adjustment pad (5) is connected with annulus (3-2) by pretension screw (6) and is corresponding with each locating piece (3-1), described wedge (4) is arranged on the top of adjusting pad (5) by pretension screw (6), its inclined-plane contacts with the inside surface of locating piece (3-1);
Part between described locating piece (3-1) and described annulus (3-2) is flexible link (3-3), and micro-deformation can occur.
2. telescope primary mirror radial positioning mechanism of center according to claim 1, is characterized in that, the number of described locating piece (3-1) is six.
3. telescope primary mirror radial positioning mechanism of center according to claim 1, is characterized in that, is provided with pretension screw (6) and loosens the screw of screw fit on described wedge (4).
4. the Method of Adjustment of telescope primary mirror radial positioning mechanism of center as claimed in claim 1, is characterized in that, the concrete steps of this Method of Adjustment are as follows:
Use simulation annulus (7) and turntable (9) as auxiliary adjustment equipment, the external diameter of simulation annulus (7) is identical with axle sleeve (2) internal diameter, first will simulate annulus (7) is connected on turntable (9), coaxial with turntable (9) by observing the first micrometer head (11) reading adjustment simulation annulus (7), keep the first micrometer head (11) invariant position and record its reading;
Unload Imitating annulus (7), load onto axle (1), coaxial with turntable (9) by observing the second micrometer head (12) reading adjustment axle (1), the second micrometer head (12) of dismantling;
Be loaded on flexible positioning head (3) and wedge (4), the first micrometer head (11) is contacted with the exterior arc surface of each locating piece (3-1) respectively, adjust the position of wedge (4), the reading that makes the first micrometer head (11) is with to adjust the reading of simulation annulus (7) when coaxial with turntable (9) identical, and now the contact outside diameter of flexible positioning head (3) is identical with axle sleeve (2) internal diameter;
Record now arrives the distance between flexible positioning head (3) bottom annulus (3-2) in each wedge (4) bottom, and carry out mark, thickness according to each wedge (4) bottom to the each adjustment pad of distance reconditioning (5) between flexible positioning head (3) bottom annulus (3-2), finally each parts good above-mentioned adjusted are pulled down from turntable (9), in the center pit of primary mirror (8), each parts are installed to relevant position according to corresponding relation.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210312907.2A CN102854604B (en) | 2012-08-29 | 2012-08-29 | Telescope primary mirror center radial positioning mechanism and assembly and adjustment method thereof |
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| CN201210312907.2A CN102854604B (en) | 2012-08-29 | 2012-08-29 | Telescope primary mirror center radial positioning mechanism and assembly and adjustment method thereof |
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| CN102854604A CN102854604A (en) | 2013-01-02 |
| CN102854604B true CN102854604B (en) | 2014-11-19 |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103399389B (en) * | 2013-07-30 | 2015-08-19 | 中国科学院长春光学精密机械与物理研究所 | A kind of primary mirror Floatable supporting mechanism with oriented film |
| CN104898252B (en) * | 2015-05-22 | 2017-07-14 | 中国科学院长春光学精密机械与物理研究所 | The main secondary mirror supporting structure of aerial camera Cassegrain |
| CN106932882B (en) * | 2015-12-31 | 2020-08-04 | 上海微电子装备（集团）股份有限公司 | Positioning and mounting structure of ellipsoidal reflector |
| CN106842495B (en) * | 2016-12-28 | 2019-04-23 | 中国科学院长春光学精密机械与物理研究所 | A kind of large telescope primary mirror chamber system mounting and positioning device and method |
| CN109387114A (en) * | 2018-10-18 | 2019-02-26 | 重庆长安工业(集团)有限责任公司 | A kind of big trunnion configuration of adaptive machining error |
| CN110146975B (en) * | 2019-06-19 | 2023-05-12 | 中科院南京耐尔思光电仪器有限公司 | Telescope primary mirror center positioning mechanism |
| CN110441880A (en) * | 2019-08-08 | 2019-11-12 | 安庆师范大学 | A kind of radial positioning mechanism of center of optical element |
| CN113576400B (en) * | 2021-08-04 | 2024-05-28 | 重庆远视科技有限公司 | Slit lamp microscope and diaphragm adjusting device thereof |
| CN113472437B (en) * | 2021-08-23 | 2023-04-14 | 东方红卫星移动通信有限公司 | Primary mirror part suitable for optical antenna of space communication terminal |
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| CN102073116A (en) * | 2010-12-15 | 2011-05-25 | 中国科学院长春光学精密机械与物理研究所 | Radial positioning mechanism of center of optical element |
| CN102436054A (en) * | 2011-12-29 | 2012-05-02 | 中国科学院长春光学精密机械与物理研究所 | Composite primary reflector supporting device for large telescope |
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| JP4306031B2 (en) * | 1999-07-02 | 2009-07-29 | 株式会社Ｉｈｉ | Optical element angle adjustment device for optical equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102073116A (en) * | 2010-12-15 | 2011-05-25 | 中国科学院长春光学精密机械与物理研究所 | Radial positioning mechanism of center of optical element |
| CN102436054A (en) * | 2011-12-29 | 2012-05-02 | 中国科学院长春光学精密机械与物理研究所 | Composite primary reflector supporting device for large telescope |
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