CN204422795U - The prestressed membrane-base reflecting mirror building mortion of a kind of adjustable thin film - Google Patents
The prestressed membrane-base reflecting mirror building mortion of a kind of adjustable thin film Download PDFInfo
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- CN204422795U CN204422795U CN201520140441.1U CN201520140441U CN204422795U CN 204422795 U CN204422795 U CN 204422795U CN 201520140441 U CN201520140441 U CN 201520140441U CN 204422795 U CN204422795 U CN 204422795U
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- film
- inner ring
- reflecting mirror
- lead plate
- battery lead
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Abstract
The utility model discloses the prestressed membrane-base reflecting mirror building mortion of a kind of adjustable film, its outer shroud and inner ring are by helicitic texture fit, and inner ring and battery lead plate bottom, by helicitic texture fit, are provided with the handle for rotating inner ring bottom inner ring; Battery lead plate bottom has through hole, facilitates battery lead plate wire to draw.Time film shaped, outer shroud and pressure ring clamp film and become horizontal, and battery lead plate bottom and inner ring, owing to have employed screw thread fit, can control the distance between film and battery lead plate by the displacement between inner ring and battery lead plate bottom, after battery lead plate pressurization, make film shaped; Simultaneously can according to the environment temperature adding man-hour, by the relative displacement between threaded adjusting inner ring and outer shroud, change inner ring height, by film jack-up, realize the prestressed adjustment of film, thus effectively can overcome the membrane-base reflecting mirror surface shape caused by environment and depart from, improve membrane-base reflecting mirror surface shape precision.This apparatus structure is simple, easy to operate, quick, has practical value.
Description
Technical field
The utility model relates to a kind of building mortion of membrane-base reflecting mirror, and particularly one can be used for regulating membrane-base reflecting mirror film prestress, and spacing between film and battery lead plate, improves the membrane-base reflecting mirror building mortion of membrane-base reflecting mirror surface shape precision.
Background technology
In recent years, along with the development of earth observation aircraft, spacecraft, as the principal reflection mirror of the chief component of space telescope, photographic system, satellite antenna, space amplitude transformer, signal detection device, more and more urgent to the demand of its super large caliber, ultra-light-weight.Traditional large caliber reflecting mirror material uses the materials such as low-expansion glass, metal, crystal usually, these rigid material form stables, but difficulty of processing is large, manufacturing cost is high, the cycle is long, and surface density is large, is difficult to fold, causes large caliber reflecting mirror weight very large, its bore will be subject to the restriction of carrier rocket load-carrying and volume, is difficult to meet super large caliber (tens to hundreds of rice) optical system to the requirement of catoptron.With film be that the membrane-base reflecting mirror of primary mirror material has that little, the collapsible expansion of weight, cost are low, variable focal length, feature that shaping degree of freedom is large, be one of direction of development super large caliber space principal reflection mirror.Membrane-base reflecting mirror adopts fexible film as its primary mirror material, document " electrostatic stretch film reflecting mirror multi-electrode distribution design and experimental study " ([D]. University Of Suzhou, 2014.) a kind of building mortion of membrane-base reflecting mirror is reported, comprise film fixing device, battery lead plate, electrostatic high-pressure output unit, battery lead plate is placed on the inside of film fixing device, fixed by film by film fixing device above battery lead plate, after film is fixing, its prestress is also fixed thereupon.In actual process, when environment temperature changes, film expands with heat and contract with cold, prestress changes, and when prestress is subject to external environment impact and changes, this device also exists the deficiency that cannot adjust film prestress, thus easily causes membrane-base reflecting mirror surface shape to depart from desirable design surface shape.Therefore, comparatively large in order to overcome existing membrane-base reflecting mirror affected by environment and surface form deviation in process, the defect that precision is inadequate, needs to provide a kind of adjustable film prestressed membrane-base reflecting mirror building mortion.
Summary of the invention
The deficiency that the utility model exists for existing membrane-base reflecting mirror building mortion, there is provided a kind of structure simple, easy to operate, quick, effectively can overcome the membrane-base reflecting mirror surface shape caused by environment temperature to depart from, improve the prestressed membrane-base reflecting mirror device of adjustable film of membrane-base reflecting mirror surface shape precision.
The technical scheme realizing the utility model object is to provide the prestressed membrane-base reflecting mirror building mortion of a kind of adjustable agent film, comprises inner ring, outer shroud, pressure ring, battery lead plate bottom, battery lead plate, electrostatic high-pressure output unit; Described outer shroud and inner ring are by helicitic texture fit, and inner ring and battery lead plate bottom are by helicitic texture fit; Battery lead plate bottom has through hole.
The handle for rotating inner ring is provided with bottom described inner ring.
When the device adopting the utility model to provide carries out membrane-base reflecting mirror shaping, battery lead plate epoxide-resin glue is pasted on battery lead plate bottom, center superposition; Film is fixed on device outer shroud upper surface with epoxide-resin glue under without prestressed horizontality; After epoxide-resin glue sclerosis, pressure ring is depressed, is mutually engaged with outer shroud, fixes film; Record now temperature; Inner ring is screwed in outer shroud certain distance, to control the prestressed size of film; Battery lead plate bottom is screwed in inner ring certain distance, with the distance between control electrode plate and film; Calculate each battery lead plate pressure by Electrostatic deformation membrane-base reflecting mirror load loading method and be converted to voltage, voltage signal being input on each counter electrode, film stretching is shaped.
Compared with prior art, membrane-base reflecting mirror building mortion provided by the utility model, can according to the environment temperature adding man-hour, by changing inner ring height, realize the prestressed adjustment of film, thus effectively can overcome the membrane-base reflecting mirror surface shape caused by environment and depart from, improve membrane-base reflecting mirror surface shape precision.This apparatus structure is simple, easy to operate, quick, has practical value.
Accompanying drawing explanation
Fig. 1 is the temperature variant curve map of membrane-base reflecting mirror F number under 15.11 μm of initial displacements providing of the utility model embodiment;
Fig. 2 is the adjustable film prestressed membrane-base reflecting mirror building mortion structural representation that the utility model embodiment provides;
Fig. 3 is the curve map of the adjustable film prestressed membrane-base reflecting mirror building mortion normal direction regulated quantity that provides of the utility model embodiment with variation of ambient temperature;
In figure: 1, pressure ring; 2, outer shroud; 3, inner ring; 4, battery lead plate bottom; 5, battery lead plate; 6, metallized film before being shaped; 7, metallized film after being shaped.
Embodiment
Below in conjunction with drawings and Examples, technical solutions of the utility model are further elaborated.
Embodiment 1
The present embodiment provides a kind of membrane-base reflecting mirror building mortion.For making to be coated with the film shaped of metallic reflector, usually film periphery is fixed on circle ring device to form initial plane.When flat film is by the effect of pressure load, on film, each point produces displacement relative to initial plane.Because film does not almost have lateral stiffness, can not bear moment of flexure, be formula (1) and (2) by the circular membrane large deformation equation obtained after the theoretical abbreviation of Karman equation circular membrane:
（1）
（2）
Wherein,
efor the elastic modulus of film,
hfor film thickness,
for stress function,
for deflection value,
rfor polar coordinates are along film bore direction,
pfor the pressure that film is subject to.
Film is fixed on circle ring device, and its starting condition can be expressed as (3):
（3）
Wherein,
represent that film exists
edge, place
rthe displacement in direction, namely the degree that under sign original state, film periphery is fixed and stretches is the radial displacement being subject to prestressed effect by film and producing;
for the Poisson ratio of film.
=0 represents that circular membrane periphery is in free flattened state, edge
rdirection is not subjected to displacement.
In order to obtain the high parabola of surface figure accuracy, be necessary the distribution and the intensity that adjust pressure.Usually to cross the parabola of frontier point and central point for desirable paraboloid surface shape, distributing to the pressure applied needed for desirable paraboloid surface shape, to carry out derivation as follows:
Desirable parabola expression formula is such as formula (4):
（4）
Wherein:
centered by amount of deflection,
for membrane-base reflecting mirror radius, suppose that pressure is distributed as about radius
rquadratic polynomial, be defined as formula (5):
（5）
Wherein
,
for undetermined coefficient.
(4) formula, (5) are substituted into (1) formula, then obtain formula (6):
（6）
From (6) formula,
about radius
rquadratic polynomial, definition (7) is as follows:
（7）
Formula (7) is substituted into formula (6), and contrast factor can obtain formula (8):
（8）
Solve
,
, pressure distribution can be obtained.
Formula (6) is substituted into formula (2) and obtains formula (9):
（9）
Formula (7) is substituted into boundary condition formula (3) formula (10) can be obtained:
（10）
Formula (9) and formula (10) are substituted into formula (8) formula (11) can be obtained:
（11）
Required pressure distribution and expression formula (12) when obtaining thus forming desirable paraboloid surface shape:
（12）
The relation that the desirable parabola membrane-base reflecting mirror surface shape formed after formula (12) establishes film drawn and boundary condition, pressure distribute.As can be seen from formula (12), (the i.e. Poisson ratio of film after membraneous material is determined
, film elastic modulus E, film thickness h is constant), then now membrane-base reflecting mirror surface shape is only relevant with the radial displacement size that prestress suffered by film causes, pressure magnitude of load and distribution situation.
When membraneous material is certain, the radial displacement size that prestress suffered by film causes by membrane-base reflecting mirror surface shape, pressure magnitude of load and distribution situation determine.But after membrane-base reflecting mirror is shaped, the fluctuation of environment temperature, by causing film, certain expansion or contraction occurring, and film prestress changes, making film produce radial displacement, thus affecting membrane-base reflecting mirror surface shape.Pass between film radial displacement and temperature is formula (13):
（13）
In formula
for membrane-base reflecting mirror radius,
for film thermal expansion coefficient,
for temperature change value.
The present embodiment adopts ANSYS software, to bore to be 200mm, F number be 10 membrane-base reflecting mirror, in variation of ambient temperature ± 5 DEG C, ± 10 DEG C time, under different structural initial pre stress effect, simulation analysis is carried out in the change of (the initial radial displacement of generation is respectively 50 μm, 100 μm, 150 μm, 200 μm) membrane-base reflecting mirror F number.The thickness of film is provided
hbe 30 μm, Young modulus
e=2.17 × 10
9pa, Poisson ratio
=0.25, film thermal expansion coefficient
=29 × 10
-6l/ DEG C.Result shows: after membrane-base reflecting mirror is shaped, if environment temperature reduces, certain contraction will occur film, and cause film internal stress to become large, membrane-base reflecting mirror F number will increase; When the temperature increases, there is certain expansion in film, film internal stress diminishes, then membrane-base reflecting mirror F number diminishes.In addition, contrasting the change of membrane-base reflecting mirror F number under different initial radial displacement can find, when variation of ambient temperature amount is identical, the F number change of the membrane-base reflecting mirror of (namely prestress is larger) that initial radial displacement is larger is less.
Adopt ANSYS software, bore 200mm, F number provided the present embodiment is the membrane-base reflecting mirror of 10, and the thickness h of film is 30 μm, Young modulus E=2.17 × 10
9pa, Poisson ratio
=0.25, film thermal expansion coefficient
=29 × 10
-6l/ DEG C, initial radial displacement be 15.11 μm, variation of ambient temperature ± 5 DEG C time, membrane-base reflecting mirror F number variation with temperature emulates, and result is as shown in Figure 1.Can see from accompanying drawing 1, membrane-base reflecting mirror F number still meets above-mentioned rule with variation of ambient temperature relation.Under this initial displacement, when ± 5 DEG C of fluctuations occur environment temperature, 200mm bore, initial F number are that the F number of the membrane-base reflecting mirror of 10 will change in 7.5 to 14 scopes.Visible, variation of ambient temperature is larger on the membrane-base reflecting mirror surface shape impact after shaping.Thus, design prestress adjustable (and then changing film radial displacement) device is necessary, to compensate the change of the membrane-base reflecting mirror F number caused by environmental temperature fluctuation.
From analysis, there is certain expansion or contraction by causing film in environmental temperature fluctuation, thus make the fixing stress in thin films of periphery send out change, and film produces radial displacement, finally affects membrane-base reflecting mirror surface shape.Formula (13) gives the relation between temperature variation and film radial displacement.The membrane-base reflecting mirror surface shape error caused by environmental temperature fluctuation can be compensated by regulating the method for film prestress and then the radial displacement of control film.
See accompanying drawing 2, it is the structural representation of the adjustable membrane-base reflecting mirror building mortion of a kind of film prestress that the present embodiment provides.Comprise pressure ring 1, outer shroud 2, inner ring 3, battery lead plate bottom 4, battery lead plate 5 and electrostatic high-pressure output unit; Outer shroud 2 and inner ring 3, by helicitic texture fit, by rotating inner ring adjustment relative displacement between the two, not needing stripping assembly, can regulate in real time in forming process to prestress; Inner ring 3 and battery lead plate bottom 4 are by helicitic texture fit, the battery lead plate 5 of ring-type is placed in above battery lead plate bottom 4, and battery lead plate bottom 4 has through hole, is drawn by the wire of battery lead plate 5, also by rotating adjustment position between the two, the relative distance of adjustment battery lead plate and film.The bottom of inner ring 3 is provided with the handle for rotating inner ring, as bottom has groove, is convenient to the relative displacement regulating inner ring and outer shroud.Add man-hour, before outer shroud 2 and pressure ring 1 clamp and be shaped, metallized film 6 one-tenth is horizontal.Battery lead plate bottom and inner ring, owing to have employed screw thread fit, can control the distance between film and battery lead plate by the displacement between inner ring and battery lead plate bottom.By to the battery lead plate making alive on battery lead plate bottom, make film shaped, metallized film 7 after obtaining being shaped.By screw thread phase fit between inner ring with outer shroud, by the relative displacement between threaded adjusting inner ring and outer shroud, by film jack-up, thus film structural initial pre stress can be changed, realize the control to film radial displacement.
When adopting this device to carry out membrane-base reflecting mirror shaping, battery lead plate epoxide-resin glue is pasted on battery lead plate bottom, center superposition; Film is fixed on device outer shroud upper surface with epoxide-resin glue under without prestressed horizontality; After epoxide-resin glue sclerosis, pressure ring is depressed, is mutually engaged with outer shroud, fixes film; Record now temperature; Inner ring is screwed on certain distance relative to outer shroud, to control the prestressed size of film, to ensure the precision of face type; Battery lead plate bottom is screwed on certain distance relative to inner ring, with the distance between control electrode plate and film; Calculate each battery lead plate pressure by Electrostatic deformation membrane-base reflecting mirror load loading method and be converted to voltage, voltage signal being input on each counter electrode, film stretching is shaped.
See accompanying drawing 3, it is the schematic diagram of the adjustable film prestressed membrane-base reflecting mirror building mortion normal direction regulated quantity that provides of the present embodiment with variation of ambient temperature; If the initial normal direction height of jack-up is
x, outer shroud inwall to the horizontal range at inner ring jack-up film place is
l, form delta-shaped region.Then initial film radial displacement
for formula (14):
（14）
When fluctuation occurs environment temperature, film prestress and radial displacement will change, and then membrane-base reflecting mirror surface shape is changed.By regulating normal direction jack-up highly to come to compensate it, notation to the regulated quantity of jack-up height is
, then obtain formula (15) and formula (16) by formula (13):
（15）
Then:
（16）
Normal direction regulated quantity can be obtained thus and vary with temperature relation.In membrane-base reflecting mirror formed machining, can the change of environmentally temperature, adopting the membrane-base reflecting mirror building mortion that the present embodiment provides, by regulating the normal direction of inner ring, thus changing the prestress of film, raising machining precision.
Claims (2)
1. the prestressed membrane-base reflecting mirror building mortion of adjustable thin film, comprises inner ring, outer shroud, pressure ring, battery lead plate bottom, battery lead plate, electrostatic high-pressure output unit; It is characterized in that: outer shroud and inner ring are by helicitic texture fit, and inner ring and battery lead plate bottom are by helicitic texture fit; Battery lead plate bottom has through hole.
2. the prestressed membrane-base reflecting mirror building mortion of a kind of adjustable thin film according to claim 1, is characterized in that: be provided with the handle for rotating inner ring bottom described inner ring.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520140441.1U CN204422795U (en) | 2015-03-12 | 2015-03-12 | The prestressed membrane-base reflecting mirror building mortion of a kind of adjustable thin film |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520140441.1U CN204422795U (en) | 2015-03-12 | 2015-03-12 | The prestressed membrane-base reflecting mirror building mortion of a kind of adjustable thin film |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108877760A (en) * | 2018-07-27 | 2018-11-23 | 江苏大学 | A kind of radially uniform prestressing force loading device of circular membrane applied to acoustic metamaterial |
-
2015
- 2015-03-12 CN CN201520140441.1U patent/CN204422795U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108877760A (en) * | 2018-07-27 | 2018-11-23 | 江苏大学 | A kind of radially uniform prestressing force loading device of circular membrane applied to acoustic metamaterial |
| CN108877760B (en) * | 2018-07-27 | 2023-02-17 | 江苏大学 | Circular film radial uniform prestress loading device applied to acoustic metamaterial |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20150624 Termination date: 20180312 |