JP2001350103A - Reflecting telescopic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reflecting telescopic device which maintains the measurement performance and improves the reliability by relieving a stress generated even when the materials of respective components vary and even if differences are generated in the thermal distortion quantity by the temperature differences among the components by the temperature change of the outside world. SOLUTION: This device includes a device body 11, a main-mirror 1 mounted on this device body by means of a base part 12 and a sub-mirror mounted at this main mirror by means of a sub-mirror supporting member 3. The main mirror and the sub-mirror consist of the same materials as each other and the sub-mirror supporting member and the base part consist of the same materials as each other. In addition, the main mirror and the sub-mirror consist of the materials different from each other. The mounting part of the sub-mirror supporting member and the mounting part o the base part on the main mirror are made freely thermally expandable and deformable with each other in a direction perpendicular to the optical axis.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reflection telescope apparatus, and more particularly, to a structure for absorbing a thermal effect due to a difference in thermal characteristics of materials of constituent parts, and a structure for restricting displacement.

[0002]

2. Description of the Related Art For example, various measuring instruments are mounted on an artificial satellite, and the proportion of the measuring instruments increases particularly in this artificial satellite. Therefore, in order to effectively utilize the launch capability of an artificial satellite, it has been an issue to reduce the size, weight, and rigidity without reducing the measurement capability of these measuring devices.

[0003] The reflection telescope device mounted on an artificial satellite is no exception. As this type of telescope device, a so-called Cassegrain-type reflection telescope device that does not generate chromatic aberration and can shorten the focal length is used.

This reflection telescope apparatus is disclosed in, for example,
It is configured as disclosed in Japanese Patent Application Laid-Open No. 1-30709, in which light reflected by a primary mirror is incident on a secondary mirror, where it is reflected and incident on an observation site.

[0005]

By the way, the primary mirror and the secondary mirror are made of a porous crystalline SiC ceramic material in order to reduce the weight, while the base component and the secondary mirror which support the primary mirror are provided. Are both made of a metal material.

That is, the primary mirror and the secondary mirror, and the base component and the secondary mirror supporting member that support them, cannot be made of the same material because of the difference in the purpose of use. Therefore, due to a change in the operating environment of the device, there is a temperature difference between the materials due to the difference in the thermal characteristics unique to each material, and stress is generated.

As a result, the shape of the mirror surface of the primary mirror which has been machined with high accuracy may be deformed, or loosening or destruction of fixing elements such as screws and adhesives may be caused, thereby deteriorating the measuring performance as a telescope. There is.

In the case where the auxiliary mirror supporting means and the main mirror or the base component are fastened and fixed with screws, if the screws are loosened due to a temperature change or disturbance vibration, the relative position between the main mirror and the auxiliary mirror supporting member is mainly changed. The position may be shifted in the direction perpendicular to the mirror mirror optical axis.

In particular, when the primary mirror is attached to and fixed to the base component and the secondary mirror supporting member is attached to and fixed to the base component via the primary mirror, the primary mirror and the secondary mirror whose positions have been adjusted with extremely high precision are generated. The positional relationship with the mirror changes, which significantly reduces the measurement performance. In the past, in order to restrict these positional deviations, a countermeasure was made with a strong frictional force of fastening the fixture, but the reliability is poor.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances. It is intended that the material of each component is different, and that the thermal distortion is obtained from the temperature difference between the components due to a change in external temperature. It is an object of the present invention to provide a reflection telescope apparatus in which even if a difference occurs, a stress generated by the difference is relaxed, measurement performance is maintained, and reliability is improved.

Still another object of the present invention is to provide a configuration in which the relative position between the sub-mirror support member and the primary mirror does not greatly change even if the fixture for mounting and fixing the sub-mirror support member becomes loose. Accordingly, it is an object of the present invention to provide a reflection telescope apparatus which maintains measurement performance and improves reliability.

[0012]

In order to satisfy the above-mentioned object, a reflection telescope apparatus according to the present invention has a main body, a main mirror attached to the main body of the apparatus via a base component, and the main mirror. A primary mirror attached to the primary mirror via a secondary mirror support means, the primary mirror and the secondary mirror are made of the same material, the secondary mirror support means and the base component are made of the same material, and the primary mirror and the secondary mirror are provided. The main mirror mounting portion of the sub-mirror support means and the main mirror mounting portion of the base component can be thermally expanded and deformed in a direction perpendicular to the optical axis.

According to a second aspect of the present invention, in the reflection telescope apparatus according to the first aspect, the sub-mirror supporting means is integrally formed with a sub-mirror mounting base for mounting the sub-mirror and at equal intervals from the sub-mirror mounting base. And a plurality of support legs protruding from the main mirror, the support legs being attached to and fixed to the primary mirror.

According to a third aspect of the present invention, in the reflection telescope device according to the first aspect, the base component is connected to the main body mounting portion and the main mirror mounting portion by a beam member.

According to a fourth aspect of the present invention, in the reflective telescope apparatus according to the third aspect, a fixture for attaching the sub mirror support means to the primary mirror is inserted by utilizing a space between the beam members of the base component. It is characterized by being attached.

In order to satisfy the above-mentioned object, the reflection telescope apparatus of the present invention is, as claim 5, a primary mirror attached to the apparatus main body via a base component, and a secondary mirror supporting means attached via the primary mirror, Comprising a secondary mirror supported by the secondary mirror support means, between the secondary mirror support means and the base component,
The present invention is characterized in that regulating means for regulating the relative position between the sub-mirror support member and the base component so as not to shift in the direction perpendicular to the optical axis is interposed.

By adopting the means for solving the above problems, it is possible to make sure that the primary mirror and the secondary mirror, and the base component for supporting the primary mirror and the secondary mirror supporting means for supporting the secondary mirror are made of different materials. As a premise, the stress in the direction perpendicular to the optical axis caused by the temperature difference between the materials is reduced.

Further, since the position of the secondary mirror supporting member with respect to the base component is regulated in a direction perpendicular to the optical axis by the regulating means, even if the fixing tool is loosened, the secondary mirror supporting member and the primary mirror are not moved. The positional relationship does not change significantly.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 shows a Cassegrain-type reflection telescope apparatus, which is a reflection telescope for observation mounted on an artificial satellite, for example, in the first embodiment. FIG.
FIG. 3 is a cross-sectional view of a main part thereof, FIG. 3 is a diagram showing the components in a divided manner, and FIG. 4 is a diagram illustrating the mounting structure.

In the figure, reference numeral 1 denotes a primary mirror, which has a so-called umbrella-like appearance. The concave curved surface 1a side of the primary mirror 1 is formed as a reflection surface that reflects incident light, and the reflection surface is formed as a concave paraboloid of revolution.

As a material constituting the primary mirror 1, a porous sintered SiC ceramic material is employed to reduce the weight, and has excellent performance with respect to rigidity, specific gravity, and thermal deformation. are doing. Actually, CV is applied to the concave surface.
D coats a dense SiC ceramic film having a thickness of, for example, 0.3 mm to 0.5 mm, and this film is mirror-polished.

A sub mirror 2 is supported by the sub mirror supporting member 3 as sub mirror supporting means with respect to the main mirror 1. The sub-mirror support member 3 includes a sub-mirror mounting base 3a for mounting the sub-mirror 2 at the distal end, and a plurality of support legs 3b integrally protruding from the sub-mirror mounting base 3a.

That is, the sub-mirror mounting base 3a has a disk shape, has an insertion hole 4 at the center thereof, and the projection 2a formed on the sub-mirror 2 is inserted therethrough. The secondary mirror 2 includes a flange portion 2b and a protruding portion 2a. The flange portion 2b and the secondary mirror mounting base 3a have substantially the same diameter, and a first spacer 5 is interposed therebetween. ,
Here, it is mounted and fixed by a mounting fixture (not shown).

The secondary mirror 2 has a reflection surface 2c facing the primary mirror 1 formed in a convex hyperboloid of revolution, and is made of a porous sintered SiC ceramic material, like the primary mirror 1. The reflective surface is coated with a dense SiC ceramic film having a thickness of, for example, 0.3 mm to 0.5 mm by CVD.

A support leg 3b constituting the sub mirror support member 3
Are provided at predetermined intervals with respect to the sub-mirror mounting base 3a, and here, three are provided. Since they are not deformed and have a predetermined strength, they are plate-shaped members designed to have a predetermined thickness, and their width gradually increases from the sub-mirror mounting base 3a to the main mirror 1 mounting end. It is formed as follows.

In particular, as shown in FIG.
The base ends of b are equidistant from each other, and a screw hole 6 is provided from each end face. Here, the circular pitch at which the screw holes 6 are provided is set to φD.

The base end of the support leg 3b is inserted into a receiving portion 1b formed in the center of the primary mirror 1 to have a concave cross section, and a first attachment provided in the screw hole 6 and the receiving portion 1b. The positioning is performed so that the holes 7 communicate with each other. A fixing screw 8 which is a fixing tool inserted from the outer surface side of the receiving portion 1b.
Thereby, the sub mirror support member 3 is attached and fixed to the primary mirror 1.

In particular, as shown in FIG. 4B, the receiving portion 1b is provided with the first mounting holes 7 at predetermined intervals on a predetermined circular pitch φD. A second mounting hole 9 is provided at a predetermined circular pitch φD between the mounting holes 7.

A hole 10 having a predetermined diameter is provided at the center position of the primary mirror receiving portion 1b, and the light reflected by the sub-mirror 2 passes through the hole 10 so as to pass through the main body 11.
An image is formed at a predetermined position in the inside.

The primary mirror 1 is formed thin in order to reduce the weight, but a predetermined force is applied to the primary mirror 1 when the reflecting surface 1a is mirror-finished, and the primary mirror 1 A force for attaching and fixing the support leg 3b by the fixing screw 8 is applied to the support leg 3b. Then, as described later, the primary mirror 1 is connected to the component base 1.
A force for attaching and fixing to 2 is also applied.

It is necessary that the primary mirror 1 has such a rigidity that it is hardly deformed by these forces, and keeps the measurement accuracy good. Therefore, a plurality of ribs 13 are formed on the back surface of the primary mirror 1 so as to be radial at predetermined intervals in the circumferential direction of the primary mirror 1 to improve the strength of the primary mirror. The shape of the rib 13 is such that the relationship between the weight and the strength of the primary mirror 1 is optimized, and the shape of the ridge of the rib is formed, for example, in a gentle parabolic shape in consideration of the effect of the weight of the rib. I have.

The base component 12 for attaching the main mirror 1 to the apparatus body 11 is formed as shown in FIGS. 3 and 4C. That is, the base component 12
Is a circular frame 14 having substantially the same diameter as the primary mirror receiving portion 1b.
And a plurality of pins 15 arranged at predetermined intervals in the circular frame 14, and a beam member 16 for connecting the pins 15 to each other and connecting the pin 15 to the circular frame 14. You.

Each of the pin portions 15 has a screw hole 17.
Are provided through. These screw holes 17 are set so as to communicate with the second mounting holes 9 provided in the primary mirror receiving portion 1b.

The beam members 16 are formed on the same diameter at equal intervals.
The pin portions 15 which are arranged in a dotted manner are formed in a substantially triangular shape in a plan view by connecting the pin portions 15 in a straight line shape. Beam member 1 that is connected to form an approximately inverted triangular shape
It consists of six.

As described above, since the base component 12 includes the circular frame 14, the pin portion 15, and the beam member 16, a space S is formed between these components. The fixing screw 8 for attaching and fixing the support leg 3b of the sub-mirror support member 3 described above to the primary mirror receiving portion 1b is shown in FIG.
Then, the fixing is performed by utilizing the space S of the base component 12 indicated by the broken line hatching.

The support legs 3 are provided on the inner side of the primary mirror receiving portion 1b.
b, a fixing screw 18 is inserted from between the two, and screwed into a screw hole 17 provided in the pin portion 15 of the base component 12 through a second mounting hole 9 provided in the receiving portion 1b, whereby the primary mirror 1 is moved. It is attached and fixed to the base component 12.

It should be noted that the base component 12 itself is
A fixing screw (not shown) is screwed into a screw hole 20 of a mounting seat 19 which is integrally provided at a predetermined interval on the outer periphery of the device 4, and is fixed to the apparatus main body 11.

This is a reflection telescope apparatus constructed as described above. Light diverging from infinity and entering the primary mirror 1 is reflected by the primary mirror 1 to the secondary mirror 2. And
The light is reflected by the secondary mirror 2 and passes through the space 10 between the beam member 16 of the base component 12 and the pin portion 15 from the through hole 10 of the primary mirror receiving portion 1b to form an image in the apparatus body 1.

For example, when the reflection telescope device is mounted on an artificial satellite, the thermal environment significantly changes as the artificial satellite moves. The primary mirror 1 and the secondary mirror 2 are made of the same material, and the secondary mirror support member 3 and the base component 12 are made of the same material.
In addition, since the primary mirror 1 and the secondary mirror 2 are made of different materials, there is a large difference in thermal characteristics unique to each material.

The primary mirror 1 and the secondary mirror 2 made of a porous sintered SiC ceramic material have a large thermal effect on the secondary mirror support member 3 and the base component 12 made of a metal material. In particular, under high-temperature conditions, the secondary mirror support member 3 and the base component 12 made of a metal material are easily deformed by thermal expansion.

The thermal expansion deformation of the sub-mirror support member 3 and the base component 12 appears in both the direction of the optical axis of the reflection telescope device and the direction perpendicular to the optical axis. However, when the sub-mirror support member 3 and the base component 12 are thermally expanded and deformed along the optical axis direction, they are attached to the main mirror 1 via the fixing screws 8 and 18, so that there is no influence. It has high rigidity against force acting in the direction.

Further, in the direction perpendicular to the optical axis, since there are a plurality of support legs 3b of the sub-mirror support member 3, they can be thermally expanded and deformed in the same direction, and independently of each other.
b, thermal expansion deformation in the same direction is relatively easily absorbed.

The base component 2 also has a large rigidity in the optical axis direction, and the configuration itself has a plurality of pin portions 15 arranged in a circular frame 14.
Since the mutually and the pin portion 15 and the circular frame 14 are connected by the beam member 16, the thermal expansion deformation acting in the direction perpendicular to the optical axis is reliably absorbed.

Since the diameter of the primary mirror 1 is larger than the diameter of the secondary mirror 2 attached to the tip of the apparatus, the primary mirror 1
Although the difference in the amount of thermal distortion between the sub mirror support member 3 and the base component 12 is easily affected by the above, the stress generated due to the difference in the amount of thermal distortion is reduced by employing the above configuration.

As described above, even when the temperature of the external environment changes significantly, the shape of the primary mirror 1 with respect to the base component 12 hardly changes, and high measurement performance is maintained. Further, even if a temperature difference occurs between the primary mirror 1 and the secondary mirror support member 3, the contact area between the primary mirror and the secondary mirror is small relative to the primary mirror diameter, and the secondary mirror support member 3 uses the secondary mirror 2 as a support end. Due to the beam structure, no large stress is generated between the primary mirror 1 and the secondary mirror support member 3.

FIGS. 5 to 7 show a reflection telescope apparatus according to a second embodiment of the present invention. FIG. 5 is a sectional view of a part of the reflection telescope apparatus, and FIG. Figure,
FIG. 7 is a view of the bottom surface of the device for explaining the mounting structure.

The appearance and the reflecting surface structure of the primary mirror 1A are not different from those described above with reference to FIG. A second mounting hole 9 is provided at a predetermined interval on the bottom 1c of the primary mirror 1A, while a screw hole 17 is formed in the base component 12A.
Is provided, the fixing screw 18 is screwed into the bottom of the primary mirror 1A, and the primary mirror 1A is fixedly attached to the base component 12A.

The sub-mirror support member 3A has its base end extended by the thickness of the bottom 1c of the main mirror 1A from that described above, and the base end of the support leg 3d is connected to the main mirror bottom 1c. Is inserted into the fitting hole 30 provided in the connector and is in a fitted state.

Since the support leg 3d is fitted to the primary mirror 1A, the support leg base end surface is in close contact with the side surface of the base component 12A. A mounting hole 31 is provided in a portion of the base component 12A facing the end face of the support leg 3d, and a screw hole 32 is provided in the support leg end face.

The fixing screw 33 is inserted from the base component 12A side and is screwed into the screw hole 32 of the support leg 3d.
The auxiliary mirror support member 3A, which is the support leg 3d, is mounted and fixed to the base component 12A via the primary mirror 1A.

Further, a bush hole 34 is provided around the fixing screw 33 and over the joint surface between the base component 12A and the support leg 3d, and a bush 35 constituting a restricting means is inserted therein. It is. The bush 35 is a simple cylindrical body, needs an outer diameter and a length to be inserted into the bush hole 34, and may have an inner diameter with a certain gap for the fixing screw 33. .

Therefore, as an assembly operation, the bush 35 is first fitted into the bush hole 34, and then the fixing screw 33 is screwed. The bush 35 may be made of the same material as the surrounding parts. For example, if it is made of a titanium (Ti) alloy, which is the same as the fixing screw 33, the support leg 3d, and the base component 12A, it is lightweight and has high rigidity with respect to specific gravity (specific rigidity), which is optimal for mounting on an artificial satellite. .

By adopting such a configuration, even if the fixing screw 33 is loosened, the primary mirror 1A
Even if the relative position between the mirror and the secondary mirror support member 3A is to change in the direction perpendicular to the mirror optical axis, this positional deviation is
, And the measurement performance as a reflection telescope device is kept high.

A similar effect can be obtained by forming and fitting projections such as dowels. However, according to the fixing structure using the bush 35, the bush 35 allows compensation for tolerances, and the manufacture of each part Is easy.

[0055]

As described above, according to the present invention, even if a difference in thermal strain occurs due to a temperature difference between components due to a change in external temperature, the stress generated thereby is relaxed to improve measurement performance. This has the effect of retaining and improving reliability.

According to the present invention, the relative position between the sub-mirror support member and the primary mirror does not need to change significantly even if the fixture for attaching and fixing the sub-mirror support member to the base component becomes loose. Configuration, maintaining measurement performance,
This has the effect of improving reliability.

[Brief description of the drawings]

FIG. 1 is a half sectional view showing a configuration of a Cassegrain-type reflection telescope device according to a first embodiment of the present invention.

FIG. 2 is a sectional view of a main part of the apparatus according to the embodiment.

FIG. 3 is an exemplary perspective view showing components of the apparatus according to the embodiment in a divided state;

FIG. 4 is a view for explaining a mounting structure of components of the apparatus according to the embodiment;

FIG. 5 is a half sectional view showing a configuration of a Cassegrain-type reflection telescope device according to a second embodiment of the present invention.

FIG. 6 is a sectional view of a main part of the device according to the embodiment;

FIG. 7 is a view for explaining a mounting structure of components of the apparatus according to the embodiment.

[Explanation of symbols]

Reference numeral 11: apparatus main body, 12, 12A: base component, 1, 1A: primary mirror, 3, 3A: secondary mirror support member, 2: secondary mirror, 3a: secondary mirror mounting base, 3b, 3d: support leg, 16: beam Element,

Claims (5)

[Claims] 1. A reflection telescope apparatus comprising: an apparatus main body; a main mirror mounted on the apparatus main body via a base component; and a sub mirror mounted on the main mirror via sub mirror support means. The mirror and the sub-mirror are made of the same material, and the sub-mirror supporting means and the base part are made of the same material, and different materials of the primary mirror and the sub-mirror. A reflection telescope apparatus, wherein the main mirror mounting portions of the base component are thermally expandable and deformable in a direction perpendicular to the optical axis. 2. The sub-mirror supporting means comprises a sub-mirror mounting base for mounting the sub-mirror, and a plurality of supporting legs integrally projecting from the sub-mirror mounting base at equal intervals. 2. The reflection telescope apparatus according to claim 1, wherein said support legs are attached and fixed to said primary mirror. 3. The reflection telescope apparatus according to claim 1, wherein the base component is connected to a main body mounting portion and a primary mirror mounting portion by a beam member. 4. A fixture for attaching the sub-mirror supporting means to the primary mirror is inserted and attached by utilizing a space between the beam members of the base component.
The reflective telescope device according to claim 1. 5. An apparatus main body, a base component mounted on the apparatus main body, a primary mirror mounted on the base component, auxiliary mirror support means mounted via the primary mirror, and supported by the auxiliary mirror support means. In the reflection telescope device provided with the sub mirror, the relative position between the sub mirror support member and the base component is restricted between the sub mirror support means and the base component so as not to be shifted in a direction perpendicular to the optical axis. A reflection telescope device characterized by interposing a regulating means.