JPH07199037A - Main reflecting mirror support device - Google Patents

Abstract

PURPOSE:To provide a support device which supports the main reflecting mirror of a reflecting telescope so that the main reflecting mirror is neither broken nor damaged by being collided against nearby other structure when switching large owing to an earthquake, etc. CONSTITUTION:Plural subordinate support bases 15 are provided at the outer peripheral part of the main reflecting mirror 11 supported on a support base 12 through support structure 13. An elastic buffer member 16 is arranged between the those subordinate support bases 15 and main reflecting mirror 11. If the main reflecting mirror 11 moves to a position 11' shown by an alternate long and short dash owing to an earthquake, it abuts on this buffer member 16 and its shock is relieved. Further, more movement of the main reflecting mirror is suppressed and the main reflecting mirror is prevented from being collided against other structure.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reflecting telescope used for astronomical observation and the like, and more particularly to a device for supporting a main reflecting mirror.

[0002]

2. Description of the Related Art Most of optical telescopes used today for astronomical observation are large-aperture telescopes. This is because, compared with a refracting telescope having the same magnification, it can be manufactured with a shorter length in the axial direction and has less chromatic aberration.

The main reflecting mirror of the reflecting telescope is a concave mirror, and the concave mirror collects light from an object to be observed. This conventional main reflector and its supporting device are shown in FIGS.
5 is shown. 13 and 14, the upper surface of the main reflecting mirror 101 is a concave mirror 101 in the drawings. The reflecting mirror 101 is fixed to a supporting base 102 via a supporting structure 103. A detailed view of this support structure 103 is shown in FIG.
5 is shown. The support structure 103 includes a thin rod 104, and the thin rod 104 absorbs a difference in elongation due to a difference in coefficient of thermal expansion between the supporting base 102 and the reflecting mirror 101 so that the reflecting mirror 1 can be absorbed.
01 has a structure of bending in the radial direction. Further, the reflecting mirror 101 is a counterweight for reducing deformation of the reflecting mirror due to its own weight when the main reflecting mirror is tilted to face the observation target.

[0004]

Since the conventional supporting device for the main reflecting mirror is configured as described above, when a large force is applied to the reflecting mirror due to an earthquake or the like, the thin rod is deformed and the reflecting mirror is There is a problem that it may move greatly from a predetermined position, interfere with other structures, and be damaged. In particular, this is an important problem when the main reflecting mirror has a thin structure in order to reduce the weight of the entire device.

The present invention has been made in order to solve the above-mentioned problems, and supports the main reflecting mirror having a function of protecting the reflecting mirror from being damaged when a large force is applied to the reflecting mirror due to an earthquake or the like. The purpose is to provide a device.

[0006]

In order to achieve the above object, in the main reflecting mirror supporting device according to the present invention, a buffering means is provided between the sub supporting base fixedly arranged on the supporting base and the main reflecting mirror. It is provided.

In particular, the apparatus according to the second aspect of the present invention is provided with the buffer means for suppressing the radial movement of the main reflecting mirror.

Further, in the apparatus according to the third aspect of the invention, in addition to the buffer means for suppressing the radial movement of the main reflecting mirror, a buffer mechanism for suppressing the movement of the main reflecting mirror in the optical axis direction is provided.

Further, in the apparatus according to the invention as defined in claim 4, there is provided a buffer means obliquely arranged in order to suppress the movement of the main reflecting mirror in both the radial direction and the optical axis direction. Further, in the apparatus according to the invention of claim 5, the buffer means is a rubber material.

Further, in the apparatus according to the invention described in claim 6, the shock absorbing means includes a spring.

Further, in the apparatus according to the seventh aspect of the invention, the shock absorbing means includes a hydraulic damper.

Further, in the apparatus according to the eighth aspect of the present invention, the cushioning means made of a rubber material has a ring shape which is received even over the entire outer circumference of the main reflecting mirror.

Furthermore, in the apparatus according to the ninth aspect of the present invention, at least three of the buffer means are arranged on the outer peripheral portion of the main reflecting mirror.

Further, in the apparatus according to the invention described in claim 10, the outer periphery of the main reflecting mirror of the hydraulic damper constituting the buffer means is divided into three groups, and the hydraulic dampers in each group are divided into three groups. Connect hydraulic piping.

Further, in the apparatus according to the invention of claim 11, the sub-support has a retracting mechanism for moving away from the main reflecting mirror. Particularly, in the device according to the invention described in claim 12, the retraction mechanism has the auxiliary support slide on the rail. Further, in the apparatus according to the invention described in claim 13, the retracting mechanism is such that the sub-support is pivotally retracted about the pivot axis.

[0016]

The present invention has the above-mentioned constitution and has the following actions.

According to the first aspect of the present invention, the buffer means can prevent the main reflecting mirror from hitting another structure and being damaged. Particularly, according to the second aspect of the invention, the main reflecting mirror can be prevented from being damaged in accordance with the movement of the main reflecting mirror in the radial direction. Further, according to the invention of claim 3, it is possible to further oppose the movement in the optical axis direction. Further, according to the invention described in claim 4, by arranging the cushioning member obliquely, it is possible to suppress both the movement of the main reflecting mirror in the radial direction and the movement of the main reflecting mirror.

According to the fifth aspect of the invention, since the cushioning means is made of a rubber material, a simple structure can be obtained. Further, according to the invention described in claim 6, it is possible to take a sufficient stroke by using the spring, and it is possible to cope with a large movement of the main reflecting mirror. Further, according to the invention described in claim 7, by using the hydraulic damper, the movement can be effectively suppressed even in the case of a small stroke.

Further, according to the invention of claim 8, by forming the buffer member made of a rubber material in a ring shape,
Can handle forces in any direction. According to the invention described in claim 9, it is possible to deal with the force in any direction by disposing at least three buffering means. Further, according to the invention described in claim 10, the configuration is simplified by dividing the hydraulic damper into three groups and sharing the hydraulic pipe for each group.

Further, in the invention according to claims 11 to 13, the sub-supporting base takes the retracted position,
Maintenance work of the main reflector becomes easy.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will be described below with reference to the drawings.

FIGS. 1 and 2 show a first embodiment of a main reflecting mirror supporting device according to the present invention. FIG. 1 is a plan view, and FIG. 2 is a diagram showing in detail a portion related to the cushioning means of the present invention. The main reflecting mirror 11 is supported on a support 12 via a support structure 13 and an overload prevention device 14. The main reflecting mirror 11 has a mirror surface 11a on the upper surface in FIG. 2 and forms a concave mirror. It can be seen that in this device, the main reflecting mirror 11 is made thinner than the conventional device. Therefore, the main reflecting mirror 11 must be sufficiently considered in terms of strength as compared with the conventional device. The support structure 13 is a thin rod 13 like the conventional device.
The thin rod has a structure for absorbing a difference in coefficient of thermal expansion between the main reflecting mirror 11 made of glass and the support base 12 made of steel. However,
In this structure, when a large load is applied due to an earthquake or the like, the thin rod 13a is broken, and the thin rod 13a must be replaced with a new one in order to restore the thin rod 13a. Therefore, an overload prevention mechanism 14 is provided to prevent the support bar 12 and the main reflecting mirror 11 from being uncoupled when the load of a predetermined value or more is applied to the support structure 13, and the thin rod 13a is not damaged. is doing.

With this overload prevention mechanism 14, the main reflecting mirror 1
When 1 is no longer fixed to the support 12,
There is a possibility that the main reflecting mirror moves greatly and collides with other components of the reflecting telescope. In particular, the main reflecting mirror 11 is manufactured very precisely, and even if the collision does not result in damage, the mirror surface 11a is distorted and cannot be used.

Therefore, in this apparatus, a sub-support base 15 fixedly mounted on the support base 12 so as to surround the main-reflection mirror 11 outside the main-reflection mirror 11, and between the sub-support base 15 and the outer periphery of the main-reflection mirror. And a cushioning mechanism including the cushioning member 16. The cushioning member 16 is made of an elastic material such as rubber, and comes into contact with the main reflecting mirror 11 when the main reflecting mirror 11 moves to a position 11 ′ shown by a one-dot chain line, so that the main reflecting mirror 11 can be sufficiently cushioned to move the main reflecting mirror 11 together. To stop it from colliding with other structures. In this device, eight buffer mechanisms are arranged on the outer circumference of the main reflecting mirror, but if at least three of them are arranged at equal intervals, the movement of the main reflecting mirror 11 can be suppressed. The reason why there are many cushioning mechanisms as in the present device is to reduce the load that each cushioning mechanism takes up, and it is possible to prevent a large local stress from occurring in the main reflecting mirror 11. Further, the buffer member 16 may be arranged in a ring shape on the outer circumference of the main reflecting mirror, instead of being arranged separately.

FIG. 3 shows a second embodiment according to the present invention. In this embodiment, the same components as those in the first embodiment are designated by the same reference numerals and the description thereof will be omitted.
The second embodiment is different from the first embodiment in that the main reflecting mirror 11
That is, it has a buffer mechanism capable of coping with the movement in the optical axis direction.

As shown in the figure, in the second embodiment,
The cushioning members 26a, 26b, 26 are provided at three positions on the sub-support base 25.
c is arranged. The first cushioning member 26a corresponds to the movement of the main reflecting mirror in the radial direction as in the first embodiment, but the second and third cushioning members 26b and 26c correspond to the movement of the main reflecting mirror 11 in the optical axis direction. Correspondingly, for example, when the main reflecting mirror is moved to the position 21 'shown by the one-dot chain line in the figure, the main reflecting mirror abuts on the second buffer member 26b.

In the second embodiment, since the second and third cushioning members 26b and 26c are arranged obliquely with respect to both the optical axis direction and the radial direction, not only in the optical axis direction but also in the radial direction. It has the effect of suppressing movement. Therefore, the first
Of the second and third cushioning members 2
It is also possible to suppress the movement in each of the radial direction and the optical axis direction by only 6b and 26c. Also, the second and third
The buffer members 26b and 26c can be arranged in the optical axis direction instead of being arranged obliquely so as to only suppress the movement in the optical axis direction. Regarding these arrangements, the main reflecting mirror 1
It should be selected according to the weight of 1 and the load capacity of the cushioning member.

FIG. 4 and FIG. 5 show a third embodiment according to the present invention. In this embodiment, the same components as those in the above-mentioned respective embodiments are designated by the same reference numerals and the description thereof is omitted. In this embodiment, the cushioning member 26a, 26b, 26c made of rubber of the second embodiment is used as the cushioning device 36 having a spring.
It is characterized in that it is replaced with a, 36b, 36c. Then, at the position 31 'shown by the alternate long and short dash line in the figure, the main reflecting mirror 11 abuts on these shock absorbers 36a, 36b, 36c. Since the stroke can be lengthened by using the spring, the shock applied to the main reflecting mirror 11 can be sufficiently buffered. Further, the supporting force can be easily changed by changing the elastic coefficient of the spring and the total length of the spring.

FIG. 6 shows a fourth embodiment according to the present invention. In this embodiment, the same components as those in the above-described embodiments are designated by the same reference numerals, and the description thereof will be omitted. In this embodiment, the cushioning member 26 made of rubber of the second embodiment is used.
a, 26b, 26c are shock absorbers 46 having hydraulic dampers
It is characterized in that it is replaced with a, 46b, 46c. Then, when the main reflecting mirror 11 moves to the position 31 'shown by the alternate long and short dash line in the figure, these shock absorbers 36a, 36
It contacts with b and 36c. The hydraulic damper allows the main reflecting mirror 11 to be supported with a small impact even when the main reflecting mirror 11 moves at a small speed.

FIGS. 7 and 8 show a fifth embodiment according to the present invention. Also in this embodiment, the same components as those in the above-described embodiments are designated by the same reference numerals, and the description thereof will be omitted. In the present embodiment, the shock absorbing member 16 of the device of the first embodiment is replaced with a shock absorbing device 56 having a hydraulic damper, and further, as shown in FIG. Three blocks 57 for the buffer mechanism
That is, it is divided into a, 57b, and 57c. The hydraulic damper pipes 58 are connected to each of the divided groups to make the supporting force of each hydraulic damper in the group constant. This prevents the load from being concentrated on one hydraulic damper.

9 and 10 show a sixth embodiment of the present invention.
Examples of are shown. Also in this embodiment, the same components as those in the above-described embodiments are designated by the same reference numerals, and the description thereof will be omitted. In this embodiment, the shock absorbers 46a, 46b, 46c having the hydraulic dampers of the fourth embodiment are replaced with shock absorbers 66a, 66b, 66c having hydraulic dampers in which common piping is provided for every three blocks. . A hydraulic pipe 68a guided from a first hydraulic damper 66a installed in the radial direction of the main reflecting mirror 11 is connected to a hydraulic damper installed in the same block in the same block, for example, a radial direction in the block 67a. Uniform oil pressure is generated in the damper. The second and third hydraulic dampers 66b and 66c, which are diagonally arranged, are also connected to the second and third hydraulic dampers in the block, respectively.

The hydraulic damper pipes 58 are connected to each of the divided groups so that the supporting force of each hydraulic damper in the group is constant. This prevents the load from being concentrated on one hydraulic damper.

FIG. 11 shows a seventh embodiment of this embodiment. The structure of the shock absorber according to the present embodiment has substantially the same structure as that of the fourth embodiment, and the same components are denoted by the same reference numerals and the description thereof will be omitted. A feature of this embodiment is that the auxiliary support 75 can move in the radial direction of the main reflecting mirror. The sub-support base 75 is slidably movable on a slide rail 79 provided on the support base 12. Therefore, it is normally fixed at a position close to the main reflecting mirror 11 shown in the figure, and is retracted in the direction of the arrow C when the main reflecting mirror 11 is maintained or maintained. by this,
Maintenance and maintenance work becomes easy.

FIG. 12 shows an eighth embodiment of this embodiment. The structure of the shock absorber according to the present embodiment has substantially the same structure as that of the fourth embodiment, and the same components are denoted by the same reference numerals and the description thereof will be omitted. A feature of this embodiment is that the sub-support base 75 is rotatably provided on a rotary shaft 89 fixed to the support base 12. Normally, it is fixed at a position close to the main reflecting mirror 11 shown in the drawing, and when performing maintenance or maintenance, it is rotated around the above-mentioned rotating shaft 89 in the direction of the arrow D in the drawing and retracted. . This facilitates maintenance and maintenance work.

For the seventh and eighth embodiments, the fourth embodiment
Although only the case where it is applied to the embodiment of the above is described, it is needless to say that it is easy to carry out in combination with other embodiments.

[0036]

As described above, according to the present invention, even when the main reflecting mirror is largely moved due to an earthquake or the like, the main reflecting mirror can be damaged or deformed by hitting another structure by the action of the buffer mechanism. It becomes possible to prevent it.

In particular, according to the third and fourth aspects of the invention, the movement of the main reflecting mirror not only in the radial direction but also in the optical axis direction can be suppressed. Further, according to the invention described in claims 5 to 7, a desired performance can be obtained by appropriately selecting the cushioning member. Further, regarding the shape as well, by adopting a shape suitable for the cushioning member according to the invention described in claims 7 to 10, the range of selection worthy of further performance is widened.

According to the invention of claims 11 to 13, by making the auxiliary support table provided with the buffer mechanism retractable, workability can be improved during maintenance and inspection.

[Brief description of drawings]

FIG. 1 is a preferred first example of a main reflecting mirror supporting device according to the present invention.
It is a top view of an example.

FIG. 2 is a detailed explanatory view of a cushioning mechanism of the device of the first embodiment.

FIG. 3 is a diagram showing a preferred second embodiment according to the present invention, and is a detailed explanatory diagram of a buffer mechanism in particular.

FIG. 4 is a diagram showing a preferred third embodiment according to the present invention, and is a detailed explanatory diagram of a buffer mechanism in particular.

FIG. 5 is a plan view of the third embodiment.

FIG. 6 is a diagram showing a preferred fourth embodiment according to the present invention, and is a detailed explanatory diagram of a buffer mechanism in particular.

FIG. 7 is a plan view of a fifth preferred embodiment according to the present invention.

FIG. 8 is a detailed explanatory view of a buffer mechanism of the fifth embodiment.

FIG. 9 is a plan view of a sixth preferred embodiment according to the present invention.

FIG. 10 is a detailed explanatory view of a buffer mechanism of the sixth embodiment.

FIG. 11 is a diagram showing a preferred seventh embodiment according to the present invention, and particularly a detailed explanatory diagram of a buffer mechanism.

FIG. 12 is a view showing a preferred eighth embodiment according to the present invention, and particularly a detailed explanatory view of a buffer mechanism.

FIG. 13 is a view showing a supporting device of a main reflecting mirror of a conventional reflecting telescope, and particularly a view showing a front cross section thereof.

14 is a BB arrow view of the main reflecting mirror support device shown in FIG. 13. FIG.

15 is a diagram showing details of a support structure of the main reflecting mirror support device shown in FIG.

[Explanation of symbols]

11 main reflecting mirror 12 support base 13 support structure 13a thin rod 15, 25, 35, 45, 55, 65, 75, 85 sub-support base 16, 26a, 26b, 26c cushioning member (rubber) 36a, 36b, 36c cushioning member (Spring) 46a, 46b, 46c, 56, 66a, 66b, 66
c Buffer member (hydraulic damper) 68, 68a, 68b, 68c Hydraulic piping 79 Sliding rail 85 Rotating shaft

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[Procedure amendment]

[Submission date] February 9, 1994

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Change

[Correction content]

[Claims]

Claims (13)

[Claims] 1. A main reflecting mirror supporting device for supporting a main reflecting mirror of a reflecting telescope, comprising: a supporting table for supporting the main reflecting mirror via a supporting member; and a sub supporting table provided on the supporting table. And a buffering means interposed between the outer peripheral portion of the main reflecting mirror and the sub-support base. 2. The main reflecting mirror supporting device according to claim 1, wherein the buffering means is installed between the outer peripheral surface of the main reflecting mirror and the sub-support, and suppresses the movement of the main reflecting mirror in the radial direction. Main reflecting mirror support device. 3. The main reflecting mirror support device according to claim 1, wherein the buffering means is a first buffering means installed between an outer peripheral surface of the main reflecting mirror and a sub-support, and the main reflecting mirror is provided on the outer peripheral portion. Second cushioning means installed between the first abutment surface facing the front of the mirror and the sub-support, and a second bumper provided on the outer peripheral portion facing the back of the main reflecting mirror. Third cushioning means installed between the contact surface and the sub-support,
The first buffering means suppresses the movement of the main reflecting mirror in the radial direction, and the second and third buffering means suppresses the movement of the main reflecting mirror in the optical axis direction. Reflector support device. 4. The main reflecting mirror support device according to claim 1, wherein the outer periphery of the main reflecting mirror is arranged obliquely with respect to each of the optical axis and the radial direction of the main reflecting mirror and faces the front side of the reflecting mirror. 1 abutting surface and a second abutting surface that is arranged obliquely with respect to each of the optical axis and the radial direction of the main reflecting mirror and faces the rear surface of the reflecting mirror, and the buffering means includes the first abutting surface. And a sub-support base, and a first shock-absorbing means installed between the second contact surface and the sub-support base. A main-reflector support device, characterized in that it suppresses the movement of the main-reflector in the radial direction and the movement in the optical axis direction. 5. The main reflecting mirror support device according to claim 2, wherein the cushioning means is made of rubber. 6. The main reflecting mirror support device according to claim 2, wherein the buffering means includes a spring. 7. The main reflecting mirror supporting device according to claim 2, wherein the buffering means includes a hydraulic damper. 8. The main reflecting mirror supporting device according to claim 5, wherein the buffering means has a ring shape provided over the entire circumference of the main reflecting mirror. 9. The main reflecting mirror support device according to claim 1, wherein at least three buffer means are arranged on the outer periphery of the main reflecting mirror. . 10. The main reflecting mirror support device according to claim 7, wherein the buffer means composed of the hydraulic damper connects the hydraulic pipes of the respective dampers for each block that divides the outer periphery of the main reflecting mirror into three equal parts. The main reflecting mirror support device is characterized by being. 11. The main reflecting mirror supporting device according to claim 9, wherein the sub-support has a retracting mechanism that separates from the main reflecting mirror to a predetermined position. 12. The main reflecting mirror support device according to claim 11, wherein the retracting mechanism is configured such that the sub supporting base slides on a rail provided on the supporting base in a radial direction of the main reflecting mirror. A main reflecting mirror support device characterized by a retracting mechanism. 13. The main reflecting mirror support device according to claim 11, wherein the retracting mechanism is supported by a rotating shaft on which the sub-support base is fixed, and the sub-support base rotates. A main reflecting mirror support device, which is a mechanism for retracting the main mirror.