JPH0610321Y2 - Concave reflector with medium aperture or larger - Google Patents
Concave reflector with medium aperture or largerInfo
- Publication number
- JPH0610321Y2 JPH0610321Y2 JP1987049718U JP4971887U JPH0610321Y2 JP H0610321 Y2 JPH0610321 Y2 JP H0610321Y2 JP 1987049718 U JP1987049718 U JP 1987049718U JP 4971887 U JP4971887 U JP 4971887U JP H0610321 Y2 JPH0610321 Y2 JP H0610321Y2
- Authority
- JP
- Japan
- Prior art keywords
- reflecting
- reflecting mirror
- concave
- thickness
- peripheral
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
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- Telescopes (AREA)
- Optical Elements Other Than Lenses (AREA)
Description
【考案の詳細な説明】 （産業上の利用分野） この考案は中口径以上の凹面反射鏡に関し、主として天
体観測用の中口径または大口径の反射望遠鏡に用いられ
る。DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a concave reflecting mirror having a medium or larger diameter, and is mainly used for a medium or large diameter reflecting telescope for astronomical observation.
（従来の技術） 従来、中口径の反射望遠鏡ａでは、第６図に示すよう
に、一方の面に所定形状の反射面ｃが形成された円板状
の厚板ガラス材の反射鏡ｂが、背面と周側面とを反射鏡
保持用セルｄによって保持されるとともに、該セルｄの
同一円周上に配設された複数個のセル調整用ねじｅによ
り、反射望遠鏡ａの基底側セルｆに保持されていた。反
射鏡保持用セルｄには、反射鏡ｂの背面に達する複数個
の反射面補正ねじｇが取り付けられていた。(Prior Art) Conventionally, in a medium-diameter reflecting telescope a, as shown in FIG. 6, a reflecting mirror b of a disk-shaped thick glass material having a reflecting surface c of a predetermined shape is formed on one surface, The back surface and the peripheral side surface are held by the reflecting mirror holding cell d, and the base side cell f of the reflecting telescope a is held by a plurality of cell adjusting screws e arranged on the same circumference of the cell d. Was held. A plurality of reflecting surface correcting screws g reaching the back surface of the reflecting mirror b were attached to the reflecting mirror holding cell d.
また、大口径の反射望遠鏡に用いられる反射鏡Ｂでは、
反射鏡Ｂの自重による各種トラブルの発生をできるだけ
少なくするため、反射鏡Ｂには円板状の厚板ガラス材を
鋳型で成形するときに、反射面と反対側の背面に、例え
ば第７図(a),(b)に示すように、多数のハニカム形状の
凹部ｈを一定深さに形成したものが用いられてきた。Further, in the reflecting mirror B used for the large-diameter reflecting telescope,
In order to reduce the occurrence of various troubles due to the weight of the reflecting mirror B as much as possible, when the reflecting plate B is molded with a disk-shaped thick glass material with a mold, the reflecting surface is formed on the back surface opposite to the reflecting surface, as shown in FIG. As shown in a) and (b), a large number of honeycomb-shaped recesses h formed with a constant depth have been used.
（考案が解決しようとする問題点） 反射鏡ｂ，Ｂが厚板ガラス材によって円板状に形成され
る場合、反射鏡ｂ，Ｂの自重は、口径が大きくなるにつ
れて急激に増加する。例えば、小口径である１０〜３０
cm程度の場合には、反射鏡の自重は１０数kg程度である
が、口径が４０cm以上になった中口径以上の反射鏡ｂ，
Ｂでは、自重は２５kg以上にもなり、手作業で円板状の
厚板ガラス材に光学研磨を施すとき、厚板ガラス材の取
り扱いが困難になるから、所定形状の反射面ｃを高い研
磨精度で能率良く仕上げることができなくなる。(Problems to be Solved by the Invention) When the reflecting mirrors b and B are formed of a thick glass material into a disk shape, the dead weights of the reflecting mirrors b and B rapidly increase as the aperture increases. For example, a small diameter 10-30
In the case of about cm, the weight of the reflecting mirror is about 10 and several kilograms, but the reflecting mirror b with a diameter of 40 cm or more and a medium diameter or more,
In B, the self-weight becomes 25 kg or more, and it becomes difficult to handle the thick glass material by hand when optically polishing the thick glass material in a disk shape. Therefore, the reflecting surface c having a predetermined shape can be polished with high accuracy. You will not be able to finish efficiently.
しかも、例え熟練工によって反射面ｃを所定形状に精度
良く仕上げたとしても、反射鏡ｂ，Ｂがあらゆる角度に
傾斜する反射望遠鏡ａに取り付けられたとき、自重の大
きな反射鏡ｂ，Ｂは、反射鏡ａの傾斜方向によって反射
面ｃにそれぞれ異なるゆがみやねじれを生じるから、得
られる映像に乱れが生じ、星像の分解能が悪くなる。さ
れとてこの不都合を解消するため、反射鏡ｂ，Ｂの受け
皿である反射鏡保持用セルｄに多くの反射面補正ねじｇ
を取り付けると、セルｄの附属金具が多くなって構造が
複雑になるだけでなく、反射面ｃのゆがみやねじれを補
正するのに著しく手数を要する。In addition, even if the reflecting surface c is accurately finished into a predetermined shape by a skilled worker, when the reflecting mirrors b and B are attached to the reflecting telescope a which inclines at any angle, the reflecting mirrors b and B having a large weight are Since different distortions and twists occur on the reflecting surface c depending on the tilt direction of the mirror a, the resulting image is disturbed and the resolution of the star image deteriorates. In order to eliminate this inconvenience, many reflecting surface correcting screws g are provided in the reflecting mirror holding cell d which is a pan of the reflecting mirrors b and B.
However, not only will the number of metal fittings for the cell d increase, the structure will become complicated, but also a great deal of work will be required to correct the distortion and twist of the reflecting surface c.
また、大口径の反射鏡Ｂの背面に、成形時にハニカム形
状の多数の凹部ｈを形成したときには、鋳型の構造が複
雑になって鋳型の製作に多額の費用を要するから、反射
鏡Ｂの製作コストが割高になるほか、複雑な鋳型から分
離された厚板ガラス材のゆがみやねじれを十分に除去す
ることができない不都合があった。Further, when a large number of honeycomb-shaped concave portions h are formed on the back surface of the large-diameter reflecting mirror B, the structure of the mold becomes complicated and a large amount of cost is required to manufacture the mold. In addition to the high cost, there is the inconvenience that the distortion and twist of the thick glass material separated from the complicated mold cannot be sufficiently removed.
（問題点を解決するための手段） この考案は前記問題点を解決すべくなされたもので、口
径がほぼ４０cmより大きな凹面反射鏡は、口径と周辺厚
さの比が約６に形成され、反射面と反対側の背面には、
光軸上の厚さが周辺厚さの１／２程度にまで薄くなるよ
うに、周辺部から中心部に向かって連続的に変化する球
面凹部が形成されるようにして中口径以上の凹面反射鏡
を構成したものである。(Means for Solving Problems) This invention has been made to solve the above problems, and a concave reflecting mirror having an aperture of more than about 40 cm is formed with a ratio of aperture to peripheral thickness of about 6, On the back side opposite the reflective surface,
Concave reflection of a medium diameter or more by forming a spherical concave portion that continuously changes from the peripheral portion to the central portion so that the thickness on the optical axis becomes as thin as about 1/2 of the peripheral thickness. It is a mirror.
（作用） この考案によれば、中口径以上の凹面反射鏡は、光軸上
の厚さが周辺厚さの１／２程度にまで薄くなるように、
周辺部から中心部に向かって連続的に変化する球面凹部
が形成されているから、鋳型による厚板ガラス材の成形
と分離は容易となり、凹面反射鏡の成形に要する材料費
は、背面に凹部が形成されていない場合に比べて約３０
％と大幅に減少し経済的となる。(Operation) According to the present invention, the concave reflecting mirror having a medium diameter or more has a thickness on the optical axis as thin as about 1/2 of the peripheral thickness.
Since the spherical concave portion that continuously changes from the peripheral portion toward the central portion is formed, it becomes easy to mold and separate the thick plate glass material by the mold, and the material cost required for molding the concave reflecting mirror is that the concave portion on the back surface Approximately 30 compared to when it is not formed
It will be significantly reduced to% and become economical.
しかも、反射鏡の周辺厚さを一定に保って反射面中央部
の重量を減少させているから、周辺部を保持された反射
鏡は、あらゆる角度に傾斜された場合にも、反射鏡の各
部に作用する重力を自然な状態で無理なく分散させ、映
像や分解能に悪影響を及ぼす反射面のゆがみやねじれな
どが少なくなる。Moreover, since the peripheral thickness of the reflecting mirror is kept constant and the weight of the central portion of the reflecting surface is reduced, the reflecting mirror holding the peripheral portion is not affected even if it is tilted at any angle. The gravity that acts on the object is naturally dispersed, and distortion and twist of the reflecting surface, which adversely affects the image and resolution, are reduced.
（実施例） 第１図および第２図はこの考案の一実施例を示したもの
で、第１図は中口径以上の反射望遠鏡１にこの実施例の
凹面反射鏡２を取り付けた場合で、第２図は凹面反射鏡
２の縦断面図である。(Embodiment) FIGS. 1 and 2 show one embodiment of the present invention. FIG. 1 shows a case where a concave reflecting mirror 2 of this embodiment is attached to a reflecting telescope 1 having a medium aperture or more. FIG. 2 is a vertical sectional view of the concave reflecting mirror 2.
凹面反射鏡２は、口径Ｄと周辺厚さtoの比が約６である
円板状の厚板ガラス材の一方の面に、所定形状の反射面
３が形成され、この反射面３には鏡面の保存性を良くす
るため、アルミニウムメッキが施されている。凹面反射
鏡２は反射面３と反対側の背面に、光軸Ｘ−Ｘ上の厚さ
ｔが周辺厚さtoの１／２程度にまで薄くなるように、口
径Ｄの２倍の背面形成半径Ｒをもつ球面凹部４が形成さ
れている。このような球面凹部４を背面に形成した場
合、反射面３の曲率が小さいため、凹面反射鏡２は、一
定厚さの周辺部から光軸中心部に向かって連続的に厚さ
を減少し、光軸上における背面側の厚さ減少量t1は光軸
上の厚さｔとほぼ等しくなる。このため、凹面反射鏡２
の重量は大幅に減少される。In the concave reflecting mirror 2, a reflecting surface 3 having a predetermined shape is formed on one surface of a disk-shaped thick glass material having a ratio of the aperture D to the peripheral thickness t o of about 6, and the reflecting surface 3 is formed on the reflecting surface 3. Aluminum plating is applied to improve the storage stability of the mirror surface. The concave reflecting mirror 2 is provided on the back surface opposite to the reflecting surface 3 so that the thickness t on the optical axis X-X is as thin as about 1/2 of the peripheral thickness t o and the back surface is twice the diameter D. A spherical concave portion 4 having a forming radius R is formed. When such a spherical concave portion 4 is formed on the back surface, since the curvature of the reflecting surface 3 is small, the concave reflecting mirror 2 continuously decreases in thickness from the peripheral portion having a constant thickness toward the center of the optical axis. The thickness reduction amount t 1 on the back side on the optical axis is substantially equal to the thickness t on the optical axis. Therefore, the concave reflecting mirror 2
The weight of is greatly reduced.
これを実験結果について見ると、口径Ｄが６５cm、周辺
厚さtoが11.8cm（Ｄ／to＝5.5)のとき、厚板ガラスのむ
く材の重量が約８３kgあったものが、光軸上の厚さｔが
5.8cmになるまで背面側に球面凹部４を形成すると、凹
面反射鏡２の重量は５８kgと約３０％軽量化された。し
かも、この反射面３の光学研磨作業は、重量が大幅に軽
減されて取り扱いが容易になっているだけ能率良く行な
うことができ、研磨精度も向上した。Looking at the experimental results, when the diameter D was 65 cm and the peripheral thickness t o was 11.8 cm (D / t o = 5.5), the weight of the stripped material of thick plate glass was about 83 kg. The thickness t of
When the spherical concave portion 4 was formed on the rear surface side until it became 5.8 cm, the weight of the concave reflecting mirror 2 was reduced to 58 kg, which is about 30% lighter. Moreover, the optical polishing work of the reflecting surface 3 can be efficiently performed as the weight is greatly reduced and the handling is easy, and the polishing accuracy is improved.
また、この凹面反射鏡２を反射望遠鏡１に取り付け、あ
らゆる角度に傾斜して天体からの反射光線を平面反射鏡
５で再度４５°反射して接眼鏡６で観測したテスト結果
では、星像の乱れが皆無であったから、傾斜によっても
反射面３にゆがみやねじれなどが生じていないことがわ
かる。このため、凹面反射鏡２を保持する反射鏡保持用
セル７は、複数個のセル調整用ねじ８を介して基底側セ
ル９に保持するだけでよく、反射鏡保持用セル７には、
従来のような反射面補正ねじを取り付ける必要はないか
ら、反射鏡保持用セル７は、構造が簡単で取り扱いは容
易となる。In addition, according to the test result in which the concave reflecting mirror 2 is attached to the reflecting telescope 1, the reflected light from the celestial body is tilted at any angle and reflected again by the flat reflecting mirror 5 by 45 ° and observed by the eyepiece 6, Since there was no disturbance, it can be seen that the reflecting surface 3 was not distorted or twisted due to the inclination. Therefore, the reflecting mirror holding cell 7 holding the concave reflecting mirror 2 only needs to be held in the base side cell 9 via the plurality of cell adjusting screws 8, and the reflecting mirror holding cell 7 is
Since it is not necessary to attach a reflecting surface correcting screw as in the conventional case, the reflecting mirror holding cell 7 has a simple structure and is easy to handle.
（考案の効果） この考案では、口径がほぼ４０cmより大きな凹面反射鏡
は、口径と周辺厚さの比が約６に形成され、反射面と反
対側の背面には、光軸上の厚さが周辺厚さの１／２程度
にまで薄くなるように、周辺部から中心部に向かって連
続的に変化する球面凹部が形成されるようにしたもので
あるから、次のようなすぐれた作用効果を奏する。(Effect of the Invention) In this invention, the concave reflecting mirror with a diameter of about 40 cm or more is formed with a ratio of the diameter and the peripheral thickness of about 6, and the thickness on the optical axis is on the back surface opposite to the reflecting surface. The spherical concave portion that continuously changes from the peripheral portion to the central portion is formed so that the thickness becomes as thin as about 1/2 of the peripheral thickness. Produce an effect.
(1)厚板ガラス材の成形に用いる鋳型の構造は簡単で、
鋳型によって形成された厚板ガラス材の成形と分離は容
易になる。(1) The structure of the mold used to mold the thick glass material is simple,
Molding and separation of the thick glass material formed by the mold is facilitated.
(2)凹面反射鏡は背面に凹部が形成されているため、凹
面反射鏡の成形に要する材料費は大幅に減少され、製作
コストは著しく割安になる。(2) Since the concave reflecting mirror has a concave portion on the back surface, the material cost required for molding the concave reflecting mirror is significantly reduced, and the manufacturing cost is significantly cheaper.
(3)反射面の光学研磨作業は、凹面反射鏡の重量が大幅
に軽減されて取り扱いが容易になっているだけ能率良く
行なうことができ、研磨精度も向上させることができ
る。(3) The optical polishing operation of the reflecting surface can be performed efficiently and the polishing accuracy can be improved because the weight of the concave reflecting mirror is greatly reduced and the handling is easy.
(4)凹面反射鏡は周辺厚さを一定に保たれ反射面と反対
側の背面には、光軸上の厚さが周辺厚さの１／２程度に
まで薄くなるように、周辺部から中心部に向かって連続
的に変化する球面凹部が形成されているから、あらゆる
角度に傾斜された場合にも、反射鏡の各部に作用する重
力を自然な状態で無理なく分散させ、映像や分解能に悪
影響を及ぼす反射面のゆがみやねじれなどが発生するの
を防止することができる。(4) The concave reflecting mirror keeps the peripheral thickness constant, and on the back surface opposite to the reflecting surface, make sure that the thickness on the optical axis becomes as thin as about 1/2 of the peripheral thickness. Since a spherical concave portion that continuously changes toward the center is formed, even when tilted at any angle, the gravity acting on each part of the reflecting mirror is naturally and reasonably dispersed, and the image and resolution are reduced. It is possible to prevent the occurrence of distortion or twist of the reflecting surface, which adversely affects the.
(5)反射面にゆがみやねじれなどが発生しにくくなって
いるから、凹面反射鏡を反射望遠鏡に取り付けるときの
反射鏡保持用セルの構造を簡単にし、反射望遠鏡の取り
扱いを容易にすることができる。(5) Since distortion and twisting are less likely to occur on the reflecting surface, it is possible to simplify the structure of the reflector holding cell when attaching the concave reflecting mirror to the reflecting telescope, and to facilitate the handling of the reflecting telescope. it can.
第１図はこの考案の反射凹面鏡を反射望遠鏡に取り付け
た状態を示す断面正面図、第２図はこの考案の一実施例
の縦断面図、第３図は従来例の反射望遠鏡への取り付け
状態を示す断面正面図、第４図(a)は従来例の他の実施
例の背面図、(b)は同縦断面図である。 ２……凹面反射鏡、３……反射面、４，４Ａ〜４Ｅ……
背面に形成される凹部、Ｘ−Ｘ……光軸、Ｄ……口径、
to……周辺厚さ、ｔ……凹面反射鏡の光軸上の厚さFIG. 1 is a sectional front view showing a state in which the reflecting concave mirror of the present invention is attached to a reflecting telescope, FIG. 2 is a vertical sectional view of an embodiment of the present invention, and FIG. 3 is a state of being attached to a conventional reflecting telescope. 4A is a rear view of another embodiment of the conventional example, and FIG. 4B is a vertical sectional view of the same. 2 ... Concave reflecting mirror, 3 ... Reflecting surface, 4, 4A-4E ...
A recess formed on the back surface, XX ... optical axis, D ... aperture,
t o …… peripheral thickness, t …… thickness of the concave reflector on the optical axis
Claims (1)
用される反射望遠鏡用凹面反射鏡であって、 口径と周辺厚さの比が約６に形成され、 反射面と反対側の背面には、光軸上の厚さが周辺厚さの
１／２程度にまで薄くなるように、周辺部から中心部に
向かって連続的に変化する球面凹部が形成されているこ
とを特徴とする中口径以上の反射望遠鏡用凹面反射鏡1. A concave reflector for a reflecting telescope used for observing astronomical objects with a diameter larger than about 40 cm, wherein the ratio of the diameter to the peripheral thickness is formed to about 6, and the rear surface opposite to the reflection surface is formed. A spherical concave portion that continuously changes from the peripheral portion toward the central portion is formed so that the thickness on the optical axis becomes as thin as about 1/2 of the peripheral thickness. Above concave reflector for telescope
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987049718U JPH0610321Y2 (en) | 1987-03-31 | 1987-03-31 | Concave reflector with medium aperture or larger |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1987049718U JPH0610321Y2 (en) | 1987-03-31 | 1987-03-31 | Concave reflector with medium aperture or larger |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS63157701U JPS63157701U (en) | 1988-10-17 |
| JPH0610321Y2 true JPH0610321Y2 (en) | 1994-03-16 |
Family
ID=30872430
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1987049718U Expired - Lifetime JPH0610321Y2 (en) | 1987-03-31 | 1987-03-31 | Concave reflector with medium aperture or larger |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0610321Y2 (en) |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59181302A (en) * | 1983-03-31 | 1984-10-15 | Canon Inc | Reflecting device |
| JPS6260302A (en) * | 1985-09-10 | 1987-03-17 | Nippon Telegr & Teleph Corp <Ntt> | Antenna system |
-
1987
- 1987-03-31 JP JP1987049718U patent/JPH0610321Y2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPS63157701U (en) | 1988-10-17 |
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