JP2015087141A - Optical component - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an optical component that responds to a request for desired mirror temperature.SOLUTION: An optical component 1 of one embodiment of the present invention includes: a surface plate 2; a pedestal 4 disposed on one principal surface 3 of the surface plate 2; and a mirror 6 disposed on one principal surface 5 of the pedestal 4. The other principal surface 7 of the pedestal 4 includes three first projections 11 whose top faces 10 are in contact with the one principal surface 3 of the surface plate 2. One end surface 9 of the mirror 6 includes three second projections 13 whose top faces 12 are in contact with the one principal surface 5 of the pedestal 4. As a result, the temperature of the mirror 6 can be set at a desired value by reducing the heat conduction between the pedestal 4 and mirror 6 while reducing the heat conduction between the surface plate 2 and pedestal 4.

Description

  The present invention relates to an optical component used in a spectroscope such as an astronomical telescope.

  Conventionally, for example, a spectroscope such as an astronomical telescope uses an optical component including a mirror for reflecting light to be observed.

  For example, Patent Document 1 describes a mirror support structure (optical component) including a mirror (mirror) and a base (surface plate) that supports the mirror.

  The mirror is an optical element, and a slit, a lens, and a camera unit, which are optical elements other than the mirror, may be arranged on the surface plate. Some optical elements may be cooled and used to reduce noise due to heat. When the mirror and the other optical elements are used at different temperatures in this way, heat is conducted between the surface plate and the mirror, so that the temperature of the mirror easily changes.

  Accordingly, there is a demand for an optical component that makes the mirror temperature desired.

Japanese Patent Laid-Open No. 2002-124809

  The present invention provides an optical component that meets the demand for a desired mirror temperature.

  An optical component according to an aspect of the present invention includes a surface plate, a pedestal disposed on one main surface of the surface plate, and a mirror disposed on one main surface of the pedestal. The surface has three first projecting portions whose top surfaces are in contact with one main surface of the surface plate, and one end surface of the mirror has three first protrusions whose top surfaces are in contact with one main surface of the pedestal. It has 2 protrusions.

  An optical component according to an aspect of the present invention includes a surface plate, a pedestal disposed on one main surface of the surface plate, and a mirror disposed on one main surface of the pedestal. The surface has three first protrusions whose top surfaces are in contact with one main surface of the surface plate, and one main surface of the pedestal has three first surfaces whose top surfaces are in contact with one end surface of the mirror. It has 3 protrusions.

  According to the optical component in one aspect of the present invention, the temperature of the mirror can be made more desirable by reducing the heat conduction between the base and the mirror while reducing the heat conduction between the surface plate and the base. it can. .

(A) is a perspective view of the optical component 1 in one Embodiment of this invention, (b) is a side view of Fig.1 (a). (A) is a top view of one main surface 5 of the base 4 of FIG.1 (b), (b) is a top view of the other main surface 7 of the base 4 of Fig.1 (a). (A) is sectional drawing along the thickness direction in the AA line of the base 4 of FIG.2 (b), (b) is the thickness direction in the BB line of the base 4 of FIG.2 (b). (C) is sectional drawing along the thickness direction in CC line of the base 4 of FIG.2 (b). It is a top view of the end surface 9 of the mirror 6 of FIG.1 (b). (A) is sectional drawing along the height direction in the DD line of the mirror 6 of FIG. 4, (b) is a cross section along the height direction in the EE line of the mirror 6 of FIG. FIG.

  Hereinafter, an optical component according to an embodiment of the present invention will be described in detail with reference to the drawings.

  The optical component 1 shown in FIGS. 1A and 1B reflects light to be observed in an optical system such as a spectroscope such as an astronomical telescope. The optical component 1 includes a surface plate 2, a pedestal 4 disposed on one main surface 3 of the surface plate 2, and a mirror 6, which is an optical element, disposed on one main surface 5 of the pedestal 4. ing. Further, on the surface plate 2 of the optical component 1, for example, a slit, a lens, a camera unit (not shown) and the like are arranged as optical elements other than the mirror 6, and an optical system such as a spectroscope is provided by these optical elements. It is configured. In this optical system, the mirror 6 reflects the light to be observed toward the slit, the lens, the camera unit, and the like, thereby enabling observation of the observation target.

  The surface plate 2 is a table serving as a reference for the optical system. An optical system based on the surface plate 2 can be formed by disposing a mirror 6, a slit, a lens, a camera unit, and the like on one main surface 3 of the surface plate 2. The surface plate 2 has a flat plate shape, for example. The surface plate 2 is made of a ceramic such as a cordierite sintered body or a silicon carbide sintered body.

  The pedestal 4 is a plate interposed between the surface plate 2 and the mirror 6. The mirror 6 can be easily attached to the surface plate 2 by interposing the pedestal 4 in this way. Further, by adjusting the height or inclination of the pedestal 4, the height or inclination of the optical axis of the mirror 6 can be easily adjusted, the positional accuracy of the mirror 6 is increased, and the accuracy of light reflected by the mirror 6 is increased. be able to. The other main surface 7 of the pedestal 4 is attached to one main surface 3 of the surface plate 2. The pedestal 4 has a flat plate shape, for example. The thickness (Z direction) of the pedestal 4 is, for example, 5 mm or more and 30 mm or less, and the width (X direction) and the length (Y direction) of the pedestal 4 are, for example, 30 mm or more and 200 mm or less. The base 4 is made of the same material as that of the surface plate 2, for example.

  The mirror 6 has a reflecting surface 8 that reflects the light of the object. One end surface 9 disposed at the end of the reflecting surface 8 of the mirror 6 is attached to one main surface 5 of the pedestal 4. The mirror 6 has a flat plate shape, the reflecting surface 8 has a concave curved surface shape, and one end surface 9 of the mirror 6 has an elongated shape. The length (Y direction) of the one end surface 9 of the mirror 6 is, for example, 5 mm or more and 30 mm or less, and the width (X direction) of the one end surface 9 of the mirror 6 is, for example, 30 mm or more and 200 mm or less. The mirror 6 is made of the same material as that of the surface plate 2, for example.

  By the way, when the optical component 1 is used, the temperature of the mirror 6 and the temperature of the surface plate 2 may be different. For example, when an optical element such as a lens or a spectroscope is disposed on the surface plate 2, if the optical element is used at a temperature different from that of the mirror 6, the temperature of the mirror 6 and the temperature of the surface plate 2 are different. Become.

On the other hand, in the present embodiment, as shown in FIGS. 2 and 3, the other main surface 7 of the pedestal 4 includes three first protrusions 11 in which the top surface 10 is in contact with one main surface 3 of the surface plate 2. Have. As a result, one main surface 3 of the surface plate 2 comes into contact with the other main surface 7 of the pedestal 4 at the top surface 10 of the three first projecting portions 11, so that fixing of the pedestal 4 to the surface plate 2 is a three-point support. The contact area between the surface plate 2 and the pedestal 4 can be reduced while making it more stable. Therefore, heat conduction between the surface plate 2 and the base 4 can be reduced.

  Further, as shown in FIGS. 4 and 5, the one end surface 9 of the mirror 6 has three second projecting portions 13 in which the top surface 12 is in contact with one main surface 5 of the base 4. As a result, since one main surface 5 of the surface plate 4 comes into contact with one end surface 9 of the mirror 6 at the top surface 12 of the three second protrusions 13, the fixing of the mirror 6 to the base 4 is more stable as a three-point support. In addition, the contact area between the base 4 and the mirror 6 can be reduced. Therefore, the heat conduction between the base 4 and the mirror 6 can be reduced.

  As described above, according to the optical component 1 of the present embodiment, the temperature of the mirror is reduced by reducing the heat conduction between the base 4 and the mirror 6 while reducing the heat conduction between the surface plate 2 and the base 4. It can be made more desirable.

  The three first projecting portions 11 are not arranged in a straight line but are arranged in a triangular shape. Thereby, fixation to the surface plate 2 of the base 4 can be made more stable. The 1st protrusion part 11 is cylindrical shape, for example. The height of the 1st protrusion part 11 is 0.05 mm or more and 0.2 mm or less, for example. The width | variety (diameter) of the 1st protrusion part 11 is 8 mm or more and 15 mm or less, for example.

  The three second protrusions 13 are not arranged in a straight line but are arranged in a triangular shape. Thereby, fixation to the base 4 of the mirror 6 can be made more stable. The 2nd protrusion part 13 is cylindrical shape, for example. The height of the 2nd protrusion part 13 is 0.05 mm or more and 0.2 mm or less, for example.

  In the present embodiment, the three first projecting portions 11 of the base 4 have first screw holes 14 that penetrate the projecting direction (Z direction) and open to the top surface 10. Of the three second protrusions 13 of the mirror 6, the two second protrusions 13 have second screw holes 15 penetrating in the protrusion direction (Z direction) and opening in the top surface 12. A region other than the first projecting portion 11 of the base 4 has two third screw holes 16 penetrating in the thickness direction (Z direction). The surface plate 2 has three fourth screw holes (not shown) opened in one main surface 3.

  The first screw hole 14 has, for example, a columnar wide portion opened on one main surface 5 of the pedestal 4 and a columnar narrow portion opened on the top surface 10 of the first protrusion 11. . The first screw hole 14 and the fourth screw hole are located in regions corresponding to each other and are connected to each other. The pedestal 4 and the surface plate 2 are fixed by inserting and fastening screws into the first screw hole 14 and the fourth screw hole from the one principal surface 5 side of the pedestal 4. The width of the opening of the first screw hole 14 in the top surface 10 of the first protrusion 11 is, for example, 8 mm or more and 15 mm or less.

  The second screw hole 15 has, for example, a bottomed cylindrical shape. The third screw hole 16 has, for example, a wide portion opened on the other principal surface 7 of the pedestal 4 and a narrow portion opened on the one principal surface 5 of the pedestal 4. The second screw hole 15 and the third screw hole 16 are located in regions corresponding to each other and are connected to each other. The pedestal 4 and the mirror 6 are fixed by inserting and fastening screws into the third screw hole 16 and the second screw hole 15 from the other main surface 7 side of the pedestal 4. The width of the opening of the second screw hole 15 in the top surface 12 of the second protrusion 13 is, for example, not less than 8 mm and not more than 15 mm.

  In the present embodiment, the three second protrusions 13 include a pair of outer second protrusions 17 positioned along the longitudinal direction (Y direction) of the one end surface 9 of the mirror 6 and a pair of outer second protrusions 17. It consists of the inner side 2nd protrusion part 18 distribute | arranged between these. The pair of outer second projecting portions 17 has second screw holes 15 that penetrate in the projecting direction (Z direction) and open to the top surface 12. The inner second projecting portion 18 does not have a screw hole that penetrates in the projecting direction and opens in the top surface 12.

  As a result, the pedestal 4 and the mirror 6 are fastened and fixed by the second screw hole 15 of the outer second projecting portion 17 and the inner second projecting portion 18 has no screw hole. The width of the top surface 19 of 18 can be easily reduced, and the contact area between the top surface 19 of the inner second protrusion 18 and the mirror 6 can be reduced. Therefore, the pedestal 4 and the mirror 6 can be fixed by fastening, and the heat conduction between the pedestal 4 and the mirror 6 can be reduced while the fixing of the pedestal 4 to the surface plate 2 is made more stable as a three-point support.

  In the present embodiment, the width of the top surface 19 of the inner second projecting portion 18 is smaller than the width of the top surface 20 of the pair of outer second projecting portions 17. As a result, as described above, the contact area between the top surface 19 of the inner second protrusion 18 and the mirror 6 can be reduced. The width (diameter) of the outer second protrusion 17 is, for example, not less than 8 mm and not more than 15 mm. The width (diameter) of the inner second protrusion 18 is, for example, not less than 8 mm and not more than 15 mm.

  In the present embodiment, the outer second protrusion 17 is further away from the reflecting surface 8 of the mirror 6 than the inner second protrusion 18. That is, the distance between the outer second projecting portion 17 and the reflecting surface 8 is larger than the distance between the inner second projecting portion 18 and the reflecting surface 8. As a result, since distortion generated when a screw is fastened to the second screw hole 15 of the outer second protrusion 17 is difficult to be transmitted to the reflecting surface 8, the shape accuracy of the reflecting surface 8 can be improved.

  In the present embodiment, the other principal surface 7 of the pedestal 4 further includes a first region 21 that is a region other than the three first projecting portions 11. The arithmetic average roughness (Ra) in the first region 21 is larger than the arithmetic average roughness (Ra) in the top surfaces 10 of the three first protrusions 11. As a result, the arithmetic average roughness (Ra) is reduced on the top surface 10 of the three first protrusions 13 to connect the pedestal 4 and the surface plate 2 with high precision, and the arithmetic average in the first region 21. By increasing the roughness (Ra), the contact area between the first region 21 and the surrounding atmosphere can be increased, and the first region 21 can be maintained at the temperature of the surrounding atmosphere. Therefore, the temperature of the pedestal 4 and the mirror 6 can be made more desirable while increasing the positional accuracy of the pedestal 4.

  In the present embodiment, the first region 21 of the other main surface 7 of the base 4 is a blasted surface. As a result, the arithmetic average roughness (Ra) of the first region 21 can be increased, and the contact area between the first region 21 and the surrounding atmosphere can be increased. Moreover, the top surfaces 10 of the three first protrusions 11 are mirror surfaces. As a result, the arithmetic average roughness (Ra) of the top surfaces 10 of the three first protrusions 11 can be reduced, and the base 4 and the surface plate 2 can be connected with high accuracy. The arithmetic average roughness (Ra) in the first region 21 is, for example, not less than 0.1 μm and not more than 0.5 μm. The arithmetic average roughness (Ra) on the top face 10 of the three first protrusions 11 is, for example, not less than 0.01 μm and not more than 0.05 μm.

  In the present embodiment, the one end surface 9 of the mirror 6 further includes a second region 22 that is a region other than the three second protrusions 13. The arithmetic average roughness (Ra) in the second region 22 is larger than the arithmetic average roughness (Ra) on the top surfaces 12 of the three second protrusions 13. As a result, the arithmetic average roughness (Ra) is reduced on the top surfaces 12 of the three second protrusions 13 to connect the pedestal 4 and the mirror 6 with high precision, and the arithmetic average roughness is calculated in the second region 22. By increasing the thickness (Ra), the contact area between the second region 22 and the surrounding atmosphere can be increased, and the second region 22 can be maintained at the temperature of the surrounding atmosphere. Therefore, it is possible to make the temperature of the mirror 6 more desirable while increasing the positional accuracy of the mirror 6.

In the present embodiment, the second region 22 of the one end surface 9 of the mirror 6 is a blasted surface. As a result, the arithmetic average roughness (Ra) of the second region 22 can be increased, and the contact area between the second region 22 and the surrounding atmosphere can be increased. Moreover, the top surfaces 12 of the three second protrusions 13 are mirror surfaces. As a result, the arithmetic average roughness (Ra) of the top surfaces 12 of the three second protrusions 13 can be reduced, and the base 4 and the mirror 6 can be connected with high accuracy. The arithmetic average roughness (Ra) in the second region 22 is, for example, not less than 0.1 μm and not more than 0.5 μm. The arithmetic average roughness (Ra) on the top surface 12 of the three second protrusions 13 is, for example, not less than 0.01 μm and not more than 0.05 μm.

  In the present embodiment, the surface plate 2, the pedestal 4, and the mirror 6 (hereinafter also referred to as each member) are made of a cordierite sintered body. As a result, since each member is made of a cordierite sintered body having a low coefficient of thermal expansion, the amount of thermal expansion of each member can be further reduced, and the positional accuracy of each member can be increased. Moreover, since each member consists of the same material, since each member behaves the same with respect to heat, the positional accuracy of each member can be improved.

  Next, the manufacturing method of the optical component 1 mentioned above is demonstrated.

  First, pure water and an organic binder are added to the raw material powder, and then wet mixed by a ball mill to produce a slurry. Next, the slurry is granulated by spray drying to form particles. Next, the particles are molded using various molding methods to form a molded body. Next, the compact is fired at 1500 to 1700 ° C. to form a sintered body. Next, the sintered body is ground and the surface plate 2 having the fourth screw hole, the base 4 having the first screw hole 14 and the third screw hole 16, and the mirror 6 having the second screw hole 15; Is made. Next, the one main surface 3 of the surface plate 2, the one main surface 5 and the other main surface 7 of the base 4, and the one end surface 9 of the mirror 6 are polished. Next, the 1st area | region 21 of the other main surface 7 of the base 4 is blasted, and the 1st protrusion part 11 is formed. At this time, the top surface 10 of the first protrusion 11 is a polished surface, and the first region 21 is a blasted surface. Further, the second protrusion 13 is formed by blasting the one end surface 9 of the mirror 6. At this time, the top surface 12 of the second protrusion 13 is a polished surface, and the second region 22 is a blasted surface.

  As described above, the surface plate 2, the pedestal 4 and the mirror 6 can be manufactured.

  Next, the base 4 and the mirror 6 are fixed by inserting and fastening screws into the third screw hole 16 of the base 4 and the second screw hole 15 of the mirror 6. Next, the base 4 and the surface plate 2 are fixed by inserting screws into the first screw holes 14 of the base 4 and the fourth screw holes of the surface plate 2 and fastening them.

  The optical component 1 can be manufactured as described above.

  The present invention is not limited to the above-described embodiments, and various modifications, improvements, combinations, and the like can be made without departing from the gist of the present invention.

  For example, in the above-described embodiment, the other main surface 7 of the pedestal 4 has three first projecting portions 11, and one end surface 9 of the mirror 6 has been described as an example having three second projecting portions 13. However, the other main surface 7 of the pedestal 4 has three first protrusions 11 in which the top surface 10 is in contact with the one main surface 3 of the surface plate 2, and the one main surface 5 of the pedestal 4 includes the mirror 6. The structure which has three 3rd protrusion parts which the top surface contact | connected to the one end surface 9 may be sufficient. Also in this case, the temperature of the mirror 6 can be made more desirable by reducing the heat conduction between the pedestal 4 and the mirror 6 while reducing the heat conduction between the surface plate 2 and the pedestal 4 as in the embodiment described above. Can be.

This 3rd protrusion part has the structure similar to the 2nd protrusion part 13 as follows, for example. The three third protrusions include a pair of outer third protrusions positioned along the longitudinal direction of the one end surface 9 of the mirror 6, and an inner third protrusion disposed between the pair of outer third protrusions. Consists of. The pair of outer third projecting portions 17 have fifth screw holes that penetrate in the projecting direction and open on the top surface. The inner third projecting portion does not have a screw hole that penetrates in the projecting direction and opens on the top surface. The width of the top surface of the inner third protrusion is smaller than the width of the top surfaces of the pair of outer third protrusions. The outer third protrusion is farther from the reflecting surface 8 of the mirror 6 than the inner third protrusion. One main surface 5 of the pedestal 4 further includes a third region that is a region other than the three third protrusions. The arithmetic average roughness (Ra) in the third region is larger than the arithmetic average roughness (Ra) on the top surfaces of the three third protrusions. The third region of the main surface 5 of the base 4 is a blasted surface. The top surfaces of the three third protrusions are polished surfaces.

  The third protrusion is formed by blasting the third region of the main surface 5 of the base 4 after polishing the main surface 5 of the base 4 in the manufacturing method of the embodiment described above. Can do.

DESCRIPTION OF SYMBOLS 1 Optical component 2 Surface plate 3 One main surface of a surface plate 4 Base 5 One main surface of a base 6 Mirror 7 Other main surfaces of a base 8 Mirror reflective surface 9 One end surface of a mirror 10 Top surface of 1st protrusion part 11 1st Projection 12 Top surface of second projection 13 Second projection 14 First screw hole 15 Second screw hole 16 Third screw hole 17 Second outer projection 18 Inner second projection 19 Top of second inner projection Surface 20 Top surface of outer second protrusion 21 First region of other main surface of base 22 Second region of one end surface of mirror

Claims (7)

A surface plate, a pedestal disposed on one main surface of the surface plate, and a mirror disposed on one main surface of the pedestal,
The other main surface of the pedestal has three first protrusions whose top surfaces are in contact with one main surface of the surface plate, and one end surface of the mirror has a top surface on one main surface of the pedestal. An optical component having three second protrusions in contact with each other. The optical component according to claim 1,
One end surface of the mirror has an elongated shape,
The three second projecting portions are a pair of outer second projecting portions positioned along the longitudinal direction of one end face of the mirror and an inner second projecting portion disposed between the pair of outer second projecting portions. And consist of
The pair of outer second projecting portions have screw holes that penetrate in the projecting direction and open on the top surface, and the inner second projecting portions penetrate in the projecting direction and open on the top surface. An optical component that does not have The optical component according to claim 2,
The width of the top surface of the inner second projecting portion is smaller than the width of the top surfaces of the pair of outer second projecting portions. The optical component according to claim 1,
One end surface of the mirror further has a region other than the three second protrusions,
An optical component characterized in that an arithmetic average roughness (Ra) in the region is larger than an arithmetic average roughness (Ra) on the top surfaces of the three second protrusions. The optical component according to claim 4,
The optical component, wherein the region other than the three second projecting portions on one end surface of the mirror is a blasted surface. The optical component according to claim 1,
The surface plate, the pedestal, and the mirror are made of a cordierite sintered body. A surface plate, a pedestal disposed on one main surface of the surface plate, and a mirror disposed on one main surface of the pedestal,
The other main surface of the pedestal has three first protrusions whose top surfaces are in contact with one main surface of the surface plate, and the one main surface of the pedestal has a top surface at one end surface of the mirror. An optical component having three third protrusions in contact with each other.

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