CN213422105U - Detection supporting tool for large-caliber convex aspheric reflector - Google Patents
Detection supporting tool for large-caliber convex aspheric reflector Download PDFInfo
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- CN213422105U CN213422105U CN202022400501.2U CN202022400501U CN213422105U CN 213422105 U CN213422105 U CN 213422105U CN 202022400501 U CN202022400501 U CN 202022400501U CN 213422105 U CN213422105 U CN 213422105U
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- Prior art keywords
- supporting
- mirror
- positioning block
- lens
- retaining ring
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Abstract
The utility model relates to a detection and support tool for a large-diameter convex aspheric reflector, which comprises a front mirror retaining ring and a rear mirror retaining ring, wherein a support positioning block is fixed between the front mirror retaining ring and the rear mirror retaining ring; the side of the supporting and positioning block is provided with a cambered surface for buffering the edge of the lens, the bottom of the side of the supporting and positioning block is also convexly provided with a bearing platform for supporting the back of the lens, and the top of the side of the supporting and positioning block is also connected with a clamping block for pressing the front of the lens. The beneficial effects of the utility model are that rational in infrastructure, the support that the lens dead weight arouses warp for a short time, is applicable to the high accuracy shape of face detection of heavy-calibre aspheric mirror.
Description
Technical Field
The utility model relates to a in optical detection technical field, specifically a heavy-calibre convex aspheric surface speculum detects support equipment.
Background
The Cassegrain and R-C system commonly used in the fields of modern large astronomical telescopes and space optics mainly uses a large-caliber convex aspheric reflector as a secondary mirror, and the caliber of the secondary mirror is continuously increased along with the increase of resolution, so that great challenges are brought to the manufacture of the secondary mirror.
The manufacture of high-precision aspheric reflectors generally adopts computer numerical control machining (including CCOS small grinding head polishing, IRP air bag polishing, MRF magnetorheological polishing, IBF ion beam polishing and the like) and high-precision surface shape interference detection technology at present. Firstly, obtaining a mirror surface shape through high-precision surface shape interference detection, then importing the mirror surface shape into computer numerical control machining process software, obtaining a numerical control machining program through calculation, and finally performing computer numerical control machining; the above processes are repeated for many times to finally obtain the high-precision surface shape. Along with the improvement of machining precision, the support deformation that the lens dead weight arouses will seriously influence the shape of face precision, and it is especially important to detect support frock.
The existing commonly used detection support modes comprise two modes, one mode is V-shaped support, the gravity of the lens only acts on two lines, the stress is very concentrated, and the local stress is very large; and secondly, the sling supports the lens, the gravity of the lens is distributed in the circumferential surface where the sling is contacted with the lens, the sling and the lens are in good contact, the stress distribution is uniform, and the local stress is small. The two support modes are commonly used for detecting a large-caliber plane and a concave reflector with thicker edges at present, and for the support stability difference of a large-caliber convex aspheric reflector with thick middle and thin edge, the lens is easy to incline and difficult to keep a vertical state in the detection and adjustment process, so that larger local stress deformation can be caused, and the detection precision of the surface shape of the mirror surface is seriously influenced.
SUMMERY OF THE UTILITY MODEL
The utility model aims to overcome the not enough of prior art, solve the support difficult problem of the protruding aspheric surface speculum of heavy-calibre.
In order to achieve the purpose of the utility model, a large-diameter convex aspheric reflector detection support tool is provided, which comprises a front mirror retaining ring and a rear mirror retaining ring, wherein a support positioning block is fixed between the front mirror retaining ring and the rear mirror retaining ring; the side edge of the supporting and positioning block is provided with a cambered surface for buffering the edge of the lens, the bottom of the side edge of the supporting and positioning block is also convexly provided with a bearing platform for supporting the back of the lens, and the top of the side edge of the supporting and positioning block is also connected with a clamping block for jacking the front of the lens; the cambered surface, the bearing platform and the clamping block are elastic bodies.
The bearing platform is matched with the clamping block, so that the lens is clamped and fixed between the bearing platform and the clamping block. The top of the supporting and positioning block is attached to the front retainer ring of the mirror, and the bottom of the supporting and positioning block is attached to the rear retainer ring of the mirror. The two surfaces of the lens are respectively the front surface and the back surface of the lens.
Preferably, a guide mounting groove is formed in the side edge of the supporting and positioning block, the guide mounting groove penetrates through the top surface of the supporting and positioning block, and the clamping block is slidably arranged in the guide mounting groove; the fixture block is pressed against the front surface of the mirror to be fixed through the extrusion of the front retainer ring of the mirror.
The specific form of the guide mounting groove matched with the fixture block can be that the guide hole in the guide mounting groove is matched with the upper guide rod of the fixture block, and can also be that the guide groove is matched with the guide block. The fixture block can realize the adjustment of the protruding part of the fixture block on the top surface of the supporting and positioning block through the guiding of the guiding and installing groove.
Preferably, one side of the front mirror retaining ring, which is back to the mirror, is closely attached to and fixed with the transparent front protection window, and one side of the rear mirror retaining ring, which is back to the mirror, is closely attached to and fixed with the transparent rear protection window.
The front protection window and the rear protection window can be made of transparent sheets with outer rings matched with the transparent sheets.
Preferably, the support positioning block is provided with a threaded hole, and the mirror front retainer ring and the mirror rear retainer ring are provided with openings corresponding to the threaded hole; the screw is matched with the threaded hole and is screwed into the corresponding threaded hole after penetrating through the opening hole.
In the process of fixing the screw to the threaded hole, the front mirror retaining ring or the rear mirror retaining ring can tightly press and abut the lens.
Preferably, at least two threaded holes are arranged on the top surface or the bottom surface of the same support positioning block at intervals.
The threaded holes can be in the form of through holes, blind holes, threaded holes penetrating through two ends of a supporting column of the supporting and positioning block and the like.
Preferably, the number of the supporting and positioning blocks is at least six, and the supporting and positioning blocks are uniformly distributed between the front mirror retaining ring and the rear mirror retaining ring.
Preferably, the fixture block, the bearing platform and the cambered surface are made of polytetrafluoroethylene, POM or nylon.
The front surface and the back surface of the lens can be respectively positioned by arranging the bearing platform and the fixture block on the supporting and positioning block; the cambered surface on the supporting and positioning block limits the edge of the lens, so that hard contact between the lens and a front lens retaining ring or a rear lens retaining ring is avoided, and deformation caused by hard contact positioning is reduced. Through the independent setting of cambered surface, cushion cap, fixture block, be convenient for with the hardness increase of retaining ring before the mirror and the retaining ring behind the mirror, reduce whole deformation.
Supporting the arrangement of a bearing platform and a clamping block on the positioning block, and transferring the extrusion force of the front mirror retaining ring and the rear mirror retaining ring to the bearing platform and the clamping block; and the guide mounting groove is arranged, so that the fixture block is provided with a dismounting way, the lens can be conveniently adapted and mounted, and the condition that the lens is not firmly clamped during mounting is avoided.
By installing the front protection window and the rear protection window as necessary, accidental damage of the mirror surface from the outside can be avoided.
Through the cooperation of screw hole, can realize with baffle ring before the mirror or baffle ring pastes to compressing tightly gradually of lens and pastes, is convenient for adjust the volume of compressing tightly, avoids the damage to the lens behind the mirror.
The threaded holes are formed at intervals, so that the single supporting and positioning block can be positioned and fixed on the front mirror retaining ring or the rear mirror retaining ring, and the deflection of the supporting and positioning block is avoided.
The supporting and positioning blocks are uniformly and annularly arranged, so that accurate and uniform force application can be realized on the lens; the mutual interval can be adjusted laterally to provide a penetration space.
Preferred fixture block, cushion cap, cambered surface material can provide the protection as high as possible for the lens, when avoiding the mar, reduces the possibility of crushing the damage.
The beneficial effects of the utility model are that rational in infrastructure, the support that the lens dead weight arouses warp for a short time, is applicable to the high accuracy shape of face detection of heavy-calibre aspheric mirror.
Drawings
Fig. 1 is a schematic view of a large-caliber convex aspheric reflector detection support tool of the present invention;
FIG. 2 is a cross-sectional view of the large-caliber convex aspheric reflector detection support tool of the present invention;
fig. 3 is a schematic view of the supporting and positioning block of the present invention;
wherein:
1-front protection window 2-mirror front retainer ring 3-fixture block
4-support positioning block 41-guide mounting groove 42-bearing platform
43-cambered surface 5-rear protection window 6-mirror rear retainer ring
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific embodiments.
The large-diameter convex aspheric reflector detection support tool comprises a front mirror retainer ring 2 and a rear mirror retainer ring 6, wherein a support positioning block 4 is fixed between the front mirror retainer ring 2 and the rear mirror retainer ring 6; the side edge of the supporting and positioning block 4 is provided with an arc surface 43 for buffering the edge of the lens, the bottom of the side edge of the supporting and positioning block 4 is also convexly provided with a bearing platform 42 for supporting the back of the lens, and the top of the side edge of the supporting and positioning block 4 is also connected with a fixture block 3 for jacking and pressing the front of the lens; the cambered surface 43, the bearing platform 42 and the fixture block 3 are elastic bodies, and the specific material of the elastic bodies is polytetrafluoroethylene, POM or nylon.
A guide mounting groove 41 is formed in the side edge of the support positioning block 4, the guide mounting groove 41 penetrates through the top surface of the support positioning block 4, and the fixture block 3 is slidably arranged in the guide mounting groove 41; the fixture block 3 is pressed against the front of the mirror to be fixed through the extrusion of the mirror front retainer ring 2.
One side of the front mirror retaining ring 2, which is back to the mirror, is attached to the fixed transparent front protection window 1 in a sealing manner, and one side of the rear mirror retaining ring 6, which is back to the mirror, is attached to the fixed transparent rear protection window 5 in a sealing manner.
The supporting and positioning block 4 is provided with a threaded hole, and the front mirror retaining ring 2 and the rear mirror retaining ring 6 are provided with openings corresponding to the threaded hole; the screw is matched with the threaded hole and is screwed into the corresponding threaded hole after penetrating through the opening hole. At least two threaded holes are arranged on the top surface or the bottom surface of the same supporting and positioning block 4 at intervals. The number of the supporting and positioning blocks 4 is at least three, six are selected in the embodiment, and the supporting and positioning blocks are uniformly distributed between the front mirror retaining ring 2 and the rear mirror retaining ring 6.
Describing the embodiment from another angle, the large-caliber convex aspheric reflector detection support tool comprises a front protection window 1, a front mirror retainer ring 2, a fixture block 3, a support positioning block 4, a support column, a rear mirror retainer ring 6 and a rear protection window 5; the front protection window 1 and the rear protection window 5 are identical in structure and can be interchanged, and the materials are integrated transparent acrylic plates; the front mirror retainer ring 2 and the rear mirror retainer ring 6 have the same structure and can be exchanged, and the whole body is made of aluminum alloy; the fixture block 3 and the support positioning block 4 are preferably made of polytetrafluoroethylene; the support column is made of stainless steel.
The lens to be detected is a large-caliber convex aspheric reflector with the diameter phi of 566mm (effective caliber phi 556mm), is made of fused quartz with high transmittance and uniformity, and is detected by adopting a back transmission zero compensation method.
Firstly, twelve supporting columns are respectively inserted into twelve supporting column mounting holes of six supporting and positioning blocks 4; then, mounting the six support positioning blocks on a back mirror retainer ring 6 through threaded holes at the bottom ends of the support columns by adopting hexagon socket head cap screws; then, a large-caliber aspheric mirror with the diameter of 566mm is placed on the supporting and positioning block 4, the lower surface of the large-caliber aspheric mirror is in contact with a lens axial supporting and positioning surface of the supporting and positioning block 4, namely a bearing platform 42, and the excircle of the large-caliber aspheric mirror is in contact with a lens circumferential supporting and positioning arc surface of the positioning and supporting block 4, namely an arc surface 43; the six latch 3 is then inserted into the six guide mounting grooves 41 supporting the positioning block 4 and abuts against the upper surface of the mirror. Moving a front mirror retaining ring 2 to be above a phi 566mm large-caliber aspheric mirror; then fixing the front mirror retaining ring 2 and a threaded hole at the top end of the support column by adopting an inner hexagon screw, and realizing the integral compression of the front mirror retaining ring 2, the support positioning block 4 and the rear mirror retaining ring 6; and finally, vertically placing the tool and the lens integrally, and installing a front protection window and a rear protection window.
In the detection process, the tool and the lens are vertically placed on the two-dimensional adjusting frame, and the coma components are adjusted to the minimum value to be measured by adjusting the inclination of the lens, the pitching and the translation of the compensator. The lens is tested at 3 angles (1 time every 120 degrees), a plurality of groups of data are measured at each angle to verify the repeatability, and the final detection result shows that the lens surface shape at three angles reaches RMS0.016 lambda less than 0.02 lambda by adopting the tool, so that the technical index requirements are met.
While the preferred embodiments of the present invention have been described in detail, it will be understood by those skilled in the art that the invention is not limited to the embodiments disclosed, and that various changes and modifications may be made, which are within the scope of the appended claims.
Claims (7)
1. The large-caliber convex aspheric reflector detection supporting tool is characterized by comprising a front reflector retainer ring (2) and a rear reflector retainer ring (6), wherein a supporting and positioning block (4) is fixed between the front reflector retainer ring (2) and the rear reflector retainer ring (6); an arc surface (43) used for buffering the edge of the lens is arranged on the side edge of the supporting and positioning block (4), a bearing platform (42) used for supporting the back of the lens is further arranged at the bottom of the side edge of the supporting and positioning block (4) in a protruding mode, and a clamping block (3) used for pressing the front of the lens is further connected to the top of the side edge of the supporting and positioning block (4); the cambered surface (43), the bearing platform (42) and the fixture block (3) are elastic bodies.
2. The large-caliber convex aspheric mirror detection supporting tool according to claim 1, wherein a guide mounting groove (41) is formed in a side edge of the supporting and positioning block (4), the guide mounting groove (41) penetrates through the top surface of the supporting and positioning block (4), and the fixture block (3) is slidably arranged in the guide mounting groove (41); the fixture block (3) is pressed against the front of the mirror to be fixed through the extrusion of the front mirror retainer ring (2).
3. The large-caliber convex aspheric reflector detection support tool according to claim 1, wherein one side of the front mirror retainer ring (2) facing away from the mirror is closely attached to the fixed transparent front protection window (1), and one side of the rear mirror retainer ring (6) facing away from the mirror is closely attached to the fixed transparent rear protection window (5).
4. The large-caliber convex aspheric reflector detection support tool according to claim 1, wherein the support positioning block (4) is provided with a threaded hole, and the front mirror retaining ring (2) and the rear mirror retaining ring (6) are provided with openings corresponding to the threaded hole; the screw is matched with the threaded hole and is screwed into the corresponding threaded hole after penetrating through the opening hole.
5. The large-caliber convex aspheric mirror detection supporting tool according to claim 4, wherein at least two threaded holes are formed in the top surface or the bottom surface of the same supporting and positioning block (4) at intervals.
6. The large-caliber convex aspheric reflector detection supporting tool according to claim 1, wherein the number of the supporting and positioning blocks (4) is at least three, and the supporting and positioning blocks are uniformly distributed between the front mirror retaining ring (2) and the rear mirror retaining ring (6).
7. The large-caliber convex aspheric reflector detection supporting tool according to claim 1, wherein the fixture block (3), the bearing platform (42) and the cambered surface (43) are made of polytetrafluoroethylene, POM or nylon.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022400501.2U CN213422105U (en) | 2020-10-26 | 2020-10-26 | Detection supporting tool for large-caliber convex aspheric reflector |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202022400501.2U CN213422105U (en) | 2020-10-26 | 2020-10-26 | Detection supporting tool for large-caliber convex aspheric reflector |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213422105U true CN213422105U (en) | 2021-06-11 |
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ID=76248089
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202022400501.2U Expired - Fee Related CN213422105U (en) | 2020-10-26 | 2020-10-26 | Detection supporting tool for large-caliber convex aspheric reflector |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213422105U (en) |
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2020
- 2020-10-26 CN CN202022400501.2U patent/CN213422105U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20210611 |