JPS63261312A - Mirror supporting device - Google Patents

Abstract

PURPOSE:To facilitate pressure control over a high pressure chamber by making a pressure receiving plate return horizontally when the inclination of a support body or mirror varies, and supporting the mirror while the direction of mirror supporting force based upon the reaction of the pressure receiving plate is set perpendicular. CONSTITUTION:When proper pressure is applied to an air pressure chamber 10, force which operates on a support jig 8 is all transmitted to the pressure receiving plate 9 through only the air in the high pressure chamber 10 and borne by a mirror cell 5 through a support rod 13. At this time, the support jig 8 receives the reaction from the pressure receiving plate 9 through the air in the high pressure chamber 10, but this reaction operates invariably at right angles to the surface of the pressure receiving plate 9. Here, even if the mirror 1 slants, the pressure receiving plate 9 is controlled to a horizontal attitude, so the support jig 8 receives invariably perpendicular force and can support the mirror 1. Further, the direction of the generation of the support force is invariably perpendicular, so a support load becomes constant. Consequently, the pressure in the high pressure chamber 10 is only held constant, so the control is facilitated.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of industrial application] The present invention relates to a mirror support device used in a mirror support mechanism of a large telescope or the like.

[Conventional technology]

Figure 2 shows, for example, a technical survey report by the Tokyo Astronomical Observatory, University of Tokyo, Nitroscope Working Group @ “Inuashi Optical Infrared Telephoto Theory”
(Showa 59/60) V is a sectional view showing the conventional mirror support device shown in Figure 1.
1 is a support head attached to the mirror (11 and equipped with a gimbal), +31 ij support head (21
(41 is the calantur weight attached to the tip of the support rod 131, 151 is the mirror cell attached to the frame, 161t/'i mirror cell + 51 V
A support rod fulcrum provided at C (71) is an actuator with a load cell provided between the mirror Ill and the mirror cell (6).

Next, the VC operation will be explained. The load due to the mirror +1's own weight is divided into an axial load (a load in the direction perpendicular to the mirror cell (5) K) and a lateral recovery load (a load in the direction parallel to the mirror cell 151). The component of the load in the groaning direction is transferred to the mirror cell 5 via an actuator with a load cell (71).
) and an actuator with a load cell (
The load desk detected by the load cell section 7) is controlled by the actuator so that it corresponds directly to the frozen load from the rigid angle of the mirror. The adjacent component of the load is caused by the "lever principle" with the support rod fulcrum (6) as the fulcrum, where the break of the counterquite (4) acts on the support head (21) via the support rod (31). In addition, vCξC mirrors.

As described above, the mirror II+ is supported in two parts, one in the self-ah axis direction and the other in the lateral direction. 400 points)) By arranging J-, the deformation of mirror +l+ is suppressed, and the precision of mirror 11 can be maintained.

[Problem that the invention seeks to solve]

Since the conventional mirror support device is configured as described above, the load on the mirror? It is necessary to support it in two parts: an axial component and a lateral component.

For this reason, two support systems are required for each support point, and it is difficult to support with high precision due to the influence of gradation force generated between the mirror and the support. Furthermore, since the axial component and the ftJ-direction component of the load change depending on the inclination angle of the mirror, it is necessary to control the load in accordance with the inclination angle.

This invention was made to solve the above-mentioned problems, and the load M at each support point can be supported by one system, so it is not affected by i# friction force, etc., and the mirror tilt can be reduced. It is an object of the present invention to provide a mirror support device that eliminates the need to take into account variations in load due to corners and that can be realized at low cost.

[Means for solving problems]

The mirror support device according to the VC of the present invention has an intermediate or spherical hollow part, and has a mirror support device. A support jig for holding the document, a support body, and a support jig arranged in the hollow part, rotatably supported by the support body to keep the horizontal position, and sealingly and slidingly cut between the inner wall of the hollow part and the inner wall of the hollow part. A pressure receiving plate is provided to form a high pressure chamber between the supports, and when the inclination of the support or the mirror changes, the pressure receiving plate returns to horizontal, and the direction of the mirror supporting force due to the reaction force of the pressure receiving plate is vertically exceeded. This is to support the mirror.

[Effect]

Since the pressure receiving plate in this invention is controlled to be horizontal, a supporting force above the vertical is always obtained regardless of the inclination angle of the mirror. Support simultaneously in one system. Furthermore, the load to be supported is always constant regardless of the inclination angle of the mirror.

〔Example〕

Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In Figure 1, mirror Ill, support head (2
), mirror cell +5114 m 2 This is the same as the conventional device shown in Figure 2. (8) is a support jig that fully supports the mirror 111 through a spherical hollow part, and is fixed to the mirror cell (61) through the support head 12), etc., and tilts according to the tilt of the mirror cell +61. The support rod (9) is placed in the hollow part of the support jig (8) and is rotatably supported by the support rod (1) to keep it horizontal, and is sealed and lubricated between the inner wall of the hollow part and the support rod (9). This is a pressure receiving plate that is sealed and slid through the material 21 and forms a high pressure chamber (101) with the inner wall of the hollow part.

tjIJ is an air ratio installed on a pressure receiving plate (91) to adjust the pressure in the high pressure chamber (10), such as air pressure.
+ Connect the air pressure chamber (lO) of each holding point to f4) pipe, u5
1 is a high-precision pressure gauge for measuring the pressure inside this pipe, that is, the air pressure in the high pressure chamber (10), a pressure pump for supplying air to +1lle, ++71 is an exhaust pump for removing air If, and Q~ is the pressure The valve for the pump, the pulp for the exhaust pump, and the controller are the controllers that control the opening and closing of these valves based on the number 1g of the high-precision pressure gauge 10.

Note that the sealing lubricant (12I includes, for example, a magnetic fluid, etc., which smoothes the movement of the pressure receiving plate 19) and prevents air leakage from the high pressure chamber UO+. In addition, the pressure plate (9)
For example, it is controlled to be always horizontal by a rotary actuator (not shown) vC based on No. 15 by an angle detector (not shown).

The operating principle of this invention is shown below. The support jig (8
). Now, the pressure in the air pressure chamber (10) is 40 degrees (1
Cerebral pressure chamber + I0 when supporting, for example, 50 cities with individual support points
The width of the pressure plate (9) can be calculated according to the area of the pressure receiving plate (9). ), all the force acting on the support jig (8) is transmitted to the pressure receiving plate (9+K) only through the air in the day room (10), and is further exchanged by the mirror cell +lil through the support rod t+31'? At this time, the support jig (8) will receive a reaction force from the pressure receiving plate 191 via the air in the high pressure chamber 101, but this reaction force will always be applied to the pressure receiving plate (9) in the opposite direction. Here, even if the mirror fi+ is tilted, the pressure receiving plate (9) is controlled to be horizontal, so the support jig (8)
is always subjected to an upward force in the vertical direction, which allows the mirror to be supported. Furthermore, since the direction in which the supporting force is generated is always above the vertical direction, the supporting load is constant, so the pressure in the six-pressure chamber (10) only needs to be kept constant, and control is easy. In addition, the axial distribution of the load of the mirror 111,
Since both lateral components are received by the support jig (8) of one VC, it is not affected by frictional force and can be supported with high accuracy.

In addition, in the above embodiment, the gust pressure in each high pressure chamber (101) is set to 1
Although all oil is measured with 1 high-precision pressure gauge, 6 high-pressure chambers (flol VC) are each independently measured with 11 high-precision pressure gauges.
Even if - is provided, the same effect as in the above embodiment can be obtained.

In addition, the air EE adjustment port dI provided in the pressure receiving plate (9)
By removing Ii and sealing the high pressure chamber tloI, pipe A4, high precision pressure gauge field, pressure capo knob +l
[9% exhaust pump 11η, pressure carbon pulp (I81
% exhaust pump pulp wire and controller @ can be installed, which makes the device cheaper and 1Mg VC
can do.

Further, in the above embodiment, the angle of the pressure receiving plate (9) is controlled by an angle detector and a rotary actuator, but the pressure receiving plate (91) may be shaped as shown in FIG. By placing the center of gravity of the support (9) on the lower surface of the support (9), it is possible to always maintain the horizontal position using only electric power, and the g position can be made inexpensive and simple.

In addition, in the above embodiment, the case where the hollow part of the support jig (8) is spherical is shown (however, it may be cylindrical, and if it is spherical, the pressure receiving plate (9) is In contrast to a VC that can be rotated in any direction, in the case of a cylindrical shape, the direction of rotation is defined.

Furthermore, in the above embodiment, there are many mirror support points for one mirror, and the inclination of the support rod (131) is different from that of the mirror cell (6
For the case where the main VC! changes with a slope of 1! As described above, the present invention can also be applied to a case where, for example, the center of the mirror is supported by one support point, and the inclination of the support rod θ4 does not change even if the inclination of the mirror changes, and the same as in the above embodiment can be applied. The effect of this can be obtained.

〔Effect of the invention〕

As described above, according to the present invention, there are provided a support jig for supporting a mirror in a cylindrical or spherical hollow part, a support body, and a support jig that is arranged in the hollow part and rotates up the support body. A pressure-receiving plate is provided that is freely supported and kept horizontal and slides sealingly between the inner wall of the hollow portion and forms a high-pressure chamber with the inner wall of the hollow portion, and the inclination of the support body or mirror changes. When this happens, the pressure receiving plate returns to the horizontal position, and the direction of the mirror supporting force due to the reaction force of the pressure receiving plate Ff and the plate? Since the mirror is supported vertically, only one support system is needed for each mirror support point, and the load to be supported is always constant regardless of the angle of inclination of the mirror. It is easy to control the pressure in the high-pressure chamber, and the device can be made inexpensive.

[Brief explanation of the drawing]

FIG. 1 is an analytical view showing a mirror support device according to one embodiment of the present invention, FIG. 8 is a side view showing a pressure receiving plate according to another embodiment of the present invention, and FIG. 3 is a conventional mirror support device #3. l indicating
FIG. In FIG. 1, Ill is a mirror, 12 is a support head, 311131 is a support rod, 041 is a column turret, 151 is a mirror cell, (71 is an actuator, (
8) is a support jig, (9) is a pressure receiving plate, :1o) is a high pressure chamber, lJ force is a suspended lubricant, 1151 is a high precision pressure gauge, bet is a pressure bomb, lI force is an exhaust pump, (a) It is a controller. In addition,? ! r The same reference numerals in the drawings indicate the same casing or corresponding parts.

Claims (1)

[Claims] A support jig that has a cylindrical or spherical hollow part and supports the mirror, a support body, and is arranged in the hollow part,
A pressure-receiving plate is rotatably supported by the support to maintain a horizontal position and slide in a sealed manner between the inner wall of the hollow part and form a high-pressure chamber with the inner wall of the hollow part; When the inclination of the pressure plate changes, the pressure receiving plate returns to horizontal,
A mirror support device that supports the mirror in a vertically upward direction relative to the direction of the mirror support force due to the reaction force of the pressure receiving plate.