JP2015102703A - Support structure of sub reflection mirror - Google Patents

Support structure of sub reflection mirror Download PDF

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JP2015102703A
JP2015102703A JP2013243509A JP2013243509A JP2015102703A JP 2015102703 A JP2015102703 A JP 2015102703A JP 2013243509 A JP2013243509 A JP 2013243509A JP 2013243509 A JP2013243509 A JP 2013243509A JP 2015102703 A JP2015102703 A JP 2015102703A
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sub
reflecting mirror
vibration
rod
reflection mirror
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加藤 篤
Atsushi Kato
篤 加藤
昇 川口
Noboru Kawaguchi
昇 川口
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Mitsubishi Electric Corp
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Mitsubishi Electric Corp
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Abstract

PROBLEM TO BE SOLVED: To suppress vibration of a sub reflection mirror to a tolerable range even if a diameter of a main reflection mirror increases.SOLUTION: There are provided a sub reflection mirror support part 7 which includes a sub reflection mirror fitting part 8 to which a sub reflection mirror 6 is fitted and a plurality of rod-like bodies 9 where one end is connected to the sub reflection mirror fitting part 8 and the other end is connected to an annular body 5, to arrange the sub reflection mirror 6 at a position which is determined relative to a main reflection mirror 3, and a vibration suppressing device 10 which suppresses vibration of the sub reflection mirror support part 7 including a lever body whose one side is connected to one rod-like body 9 whose one end is connected to the intersection, being arranged on the suppressing force acting surface, or to two rod-like bodies 9 whose one end is connected to the intersection, being arranged symmetrical on the suppression force acting surface, at each of two intersections between the annular body 5 and a suppressing force acting surface which is a flat surface containing an optical axis of the main reflection mirror 3, with a mass body having a decided weight connected to the other side, as well as a support point of the lever body provided near the intersection.

Description

本発明は、主反射鏡と副反射鏡を有する反射望遠鏡における副反射鏡の支持構造に関する。   The present invention relates to a support structure for a sub-reflecting mirror in a reflecting telescope having a main reflecting mirror and a sub-reflecting mirror.

主反射鏡と主反射鏡で反射された光をさらに反射する副反射鏡を有する望遠鏡では、副反射鏡はスパイダ支持構造体と呼ばれる構造物により支持されている。スパイダ支持構造体では、主反射鏡の上方に設けられた環状の外囲器と同一平面内でスパイダにより副反射鏡が支持されている。(特許文献1参照)   In a telescope having a main reflector and a sub-reflector that further reflects light reflected by the main reflector, the sub-reflector is supported by a structure called a spider support structure. In the spider support structure, the sub-reflector is supported by the spider in the same plane as the annular envelope provided above the main reflector. (See Patent Document 1)

近年、天文学の分野では口径数十メートルの次世代の超大型光学望遠鏡の開発計画が進んでいる。口径の大型化により、主反射鏡で反射された反射光をさらに反射する副反射鏡は、主反射鏡から従来よりも離れた位置になり、副反射鏡を支持する部材(副反射鏡支持部と呼ぶ)も従来のものより長くなり、剛性が十分に高い構造とするのが難しくなっている。また、主反射鏡をできるだけ遮蔽しないようにするために副反射鏡支持部の幅は狭いほうが望ましい。さらに、風による変形量を少なくするために副反射鏡支持部が風圧を受ける面積が少ないほうが望ましい。そのため、副反射鏡支持部を十分に太くして、剛性が十分に高い構造とすることが難しくなり、外部から加えられる加速度(力)により、副反射鏡支持部および副反射鏡が振動する可能性がある。望遠鏡の観測精度を維持するには、副反射鏡の振動は許容限度以下に抑える必要がある。
副反射鏡支持部に外部から加速度が加えられる原因としては、地震、風などが想定される。また、仰角を変更する際にも加速度が発生する。
In recent years, development plans for next-generation ultra-large optical telescopes with a diameter of several tens of meters are advancing in the field of astronomy. Due to the increase in aperture, the sub-reflector that further reflects the reflected light reflected by the main reflector is positioned farther away from the main reflector than before, and the member that supports the sub-reflector (sub-reflector support section) Is also longer than the conventional one, making it difficult to achieve a structure with sufficiently high rigidity. Further, it is desirable that the width of the sub-reflecting mirror support portion is narrow so as to shield the main reflecting mirror as much as possible. Furthermore, in order to reduce the amount of deformation due to wind, it is desirable that the sub-reflecting mirror support portion has a small area to receive wind pressure. For this reason, it is difficult to make the sub-reflector support part sufficiently thick and to have a sufficiently high rigidity, and the sub-reflector support part and the sub-reflector can vibrate due to acceleration (force) applied from the outside. There is sex. In order to maintain the observation accuracy of the telescope, it is necessary to keep the vibration of the sub-reflector below the allowable limit.
Possible causes of external acceleration applied to the sub-reflecting mirror support are earthquakes and winds. Also, acceleration occurs when changing the elevation angle.

特開平4―175715JP-A-4-175715

構造物の振動を抑制するために、構造物の上部などに振動を打ち消す力を構造物に加える振動抑制装置を設置することがよく行われる。副反射鏡が取り付けられる部材である副反射鏡取付部の副反射鏡が存在しない側の面には、望遠鏡の観測で使用される機器が取付けられ、振動抑制装置を設置する空間を確保することが難しい。また、副反射鏡取付部に振動抑制装置を取付けると、風を受ける面積が大きくなり、より振動しやすくなる。
本発明の目的は、副反射鏡支持部の振動を許容限度以下に抑える振動抑制装置を備えた副反射鏡の支持構造を提供することである。
In order to suppress the vibration of the structure, it is often performed to install a vibration suppression device that applies a force to cancel the vibration to the upper part of the structure. Equipment used for observation of telescopes is installed on the surface of the sub-reflector mounting part where the sub-reflector is attached, on the side where the sub-reflector does not exist, and a space for installing the vibration suppression device is secured. Is difficult. Further, when the vibration suppressing device is attached to the sub-reflecting mirror attaching portion, the area for receiving the wind is increased, and vibration is more likely to occur.
The objective of this invention is providing the support structure of a subreflector provided with the vibration suppression apparatus which suppresses the vibration of a subreflector support part to an allowable limit or less.

この発明に係る副反射鏡の支持構造は、観測源からの観測波を反射する主反射鏡に対して前記観測源側の決められた位置に配置された環状体と、前記環状体よりも前記観測源側に前記主反射鏡に対して決められた位置に前記主反射鏡に対向して配置され、前記主反射鏡で反射された前記観測波を反射する副反射鏡が取付けられる副反射鏡取付部、一端が前記副反射鏡取付部に接続され他端が前記環状体に接続される複数の棒状体を有し、前記副反射鏡を前記主反射鏡に対して決められた位置に配置する副反射鏡支持部と、前記主反射鏡の光軸を含む平面である抑制力作用面と前記環状体との2個の交点のそれぞれにおいて、前記交点に一端が接続されて前記抑制力作用面上に配置された1本の前記棒状体、あるいは、前記交点に一端が接続されて前記抑制力作用面に対称に配置された2本の前記棒状体に一方の側が接続され、他方の側に決められた重さの質量体が接続された梃子体、前記交点の近傍に設けられた前記梃子体の支点とを有する、前記副反射鏡支持部の振動を抑制する振動抑制装置とを備えたものである。   The sub-reflecting mirror supporting structure according to the present invention includes an annular body arranged at a predetermined position on the observation source side with respect to the main reflecting mirror that reflects an observation wave from the observation source, and the annular body more than the annular body. A sub-reflecting mirror that is disposed on the observation source side at a position determined with respect to the main reflecting mirror so as to be opposed to the main reflecting mirror and that reflects the observation wave reflected by the main reflecting mirror. A mounting portion having a plurality of rod-shaped bodies having one end connected to the sub-reflecting mirror mounting portion and the other end connected to the annular body, and the sub-reflecting mirror is disposed at a predetermined position with respect to the main reflecting mirror One end of each of the two intersections of the sub-reflecting mirror supporting portion, the restraining force acting surface which is a plane including the optical axis of the main reflecting mirror, and the annular body, and the restraining force acting is connected to the intersection. One end of the rod-shaped body arranged on the surface or the intersection is connected to one end. An insulator having one side connected to the two rod-like bodies arranged symmetrically on the restraining force acting surface and a mass body having a weight determined on the other side is provided in the vicinity of the intersection. And a vibration suppressing device that suppresses vibration of the sub-reflecting mirror support portion.

この発明によれば、副反射鏡支持部の振動を許容限度以下に抑えることができる。   According to this invention, the vibration of the sub-reflecting mirror support portion can be suppressed to an allowable limit or less.

この発明に係る副反射鏡の支持構造を有する反射望遠鏡の構造を説明する図である。It is a figure explaining the structure of the reflective telescope which has the support structure of the subreflector which concerns on this invention. この発明の実施の形態1に係る副反射鏡の支持構造が有する副反射鏡支持部の構造を説明する図である。It is a figure explaining the structure of the subreflection mirror support part which the support structure of the subreflection mirror which concerns on Embodiment 1 of this invention has. この発明の実施の形態1に係る副反射鏡の支持構造が有する副反射鏡支持部とその振動を抑制する振動抑制装置の構造を説明する図である。It is a figure explaining the structure of the vibration suppression apparatus which suppresses the subreflection mirror support part which the support structure of the subreflection mirror which concerns on Embodiment 1 of this invention has, and its vibration. この発明の実施の形態1に係る副反射鏡の支持構造が有する副反射鏡支持部の振動を抑制する振動抑制装置の構造を説明する拡大図である。It is an enlarged view explaining the structure of the vibration suppression apparatus which suppresses the vibration of the subreflection mirror support part which the support structure of the subreflection mirror which concerns on Embodiment 1 of this invention has. この発明の実施の形態1に係る副反射鏡の支持構造において、比較例として振動抑制装置が備えられていない場合に外部から加速度が加えられて副反射鏡支持部が変形する様子を説明する図である。In the support structure of the sub-reflecting mirror according to Embodiment 1 of the present invention, when the vibration suppressing device is not provided as a comparative example, a diagram illustrating a state in which the sub-reflecting mirror supporting portion is deformed by applying an acceleration from the outside. It is. この発明の実施の形態1に係る副反射鏡の支持構造において外部から加えられる加速度に対して振動抑制装置により副反射鏡支持部の変形が軽減される様子を説明する図である。It is a figure explaining a mode that a deformation | transformation of a subreflecting mirror support part is reduced by the vibration suppression apparatus with respect to the acceleration applied from the outside in the support structure of the subreflecting mirror which concerns on Embodiment 1 of this invention. この発明の実施の形態2に係る副反射鏡の支持構造が有する副反射鏡支持部の構造を説明する図である。It is a figure explaining the structure of the subreflector support part which the support structure of the subreflector which concerns on Embodiment 2 of this invention has. この発明の実施の形態2に係る副反射鏡の支持構造が有する副反射鏡支持部とその振動を抑制する振動抑制装置の構造を説明する図である。It is a figure explaining the structure of the vibration suppression apparatus which suppresses the subreflector support part which the support structure of the subreflector which concerns on Embodiment 2 of this invention has, and its vibration. この発明の実施の形態3に係る副反射鏡の支持構造が有する副反射鏡支持部の振動を抑制する振動抑制装置の構造を説明する拡大図である。It is an enlarged view explaining the structure of the vibration suppression apparatus which suppresses the vibration of the subreflector support part which the support structure of the subreflector which concerns on Embodiment 3 of this invention has. この発明の実施の形態3に係る副反射鏡の支持構造が有する副反射鏡支持部の振動を抑制する振動抑制装置の振動減衰装置の種類を記号により表現した図である。It is the figure which expressed the kind of the vibration damping device of the vibration suppression device which suppresses the vibration of the subreflecting mirror support part which the support structure of the subreflecting mirror concerning Embodiment 3 of this invention has, with a symbol.

実施の形態1
図1は、この発明に係る副反射鏡の支持構造を有する反射望遠鏡の構造を説明する図である。反射望遠鏡は、水平面において回転して望遠鏡の方位角(アジマス角)を変更するアジマス架台1と、アジマス架台1の上に載り望遠鏡の仰角を変更するエレベーション回転台2と、エレベーション回転台2に保持された観測源からの観測波を反射する主反射鏡3と、主反射鏡3の光軸の方向において主反射鏡3に入射する観測波が通る円筒状の空間の外側に設けられた構造部材であるアッパーチューブ4と、アッパーチューブ4の主反射鏡3とは反対側に設けられてアッパーチューブ4が接続された環状体であるトップリング5と、主反射鏡3で反射された観測波を反射する副反射鏡6と、副反射鏡6をトップリング5に対して決められた位置に配置する副反射鏡支持部7とを有する。副反射鏡6により反射された観測波は、図示しない観測装置に入力され、天体などの観測源を観測する。なお、図1で、アジマス架台1、エレベーション回転台2、アッパーチューブ4は外形だけを描いている。図1に示す副反射鏡6は凸面鏡であるが、平面鏡や凹面鏡の場合もある。
トップリング5と、副反射鏡支持部7と、副反射鏡支持部7および副反射鏡6の振動を抑制する振動抑制装置10(図1には図示せず)とを有するものが、振動を抑制して副反射鏡を支持する副反射鏡の支持構造である。
Embodiment 1
FIG. 1 is a view for explaining the structure of a reflecting telescope having a support structure for a sub-reflecting mirror according to the present invention. The reflecting telescope rotates on a horizontal plane to change the azimuth angle (azimuth angle) of the telescope, an elevation turntable 2 that changes the elevation angle of the telescope placed on the azimuth stand 1, and the elevation turntable 2. The main reflection mirror 3 that reflects the observation wave from the observation source held in the center and the outside of the cylindrical space through which the observation wave incident on the main reflection mirror 3 passes in the direction of the optical axis of the main reflection mirror 3 The upper tube 4 that is a structural member, the top ring 5 that is an annular body provided on the opposite side of the upper tube 4 from the main reflector 3 and connected to the upper tube 4, and the observation reflected by the main reflector 3 A sub-reflecting mirror 6 that reflects waves and a sub-reflecting mirror support 7 that arranges the sub-reflecting mirror 6 at a predetermined position with respect to the top ring 5 are provided. The observation wave reflected by the sub-reflecting mirror 6 is input to an observation device (not shown) and observes an observation source such as an astronomical object. In FIG. 1, the azimuth mount 1, the elevation turntable 2, and the upper tube 4 are drawn only in outline. The sub-reflecting mirror 6 shown in FIG. 1 is a convex mirror, but may be a plane mirror or a concave mirror.
A device having a top ring 5, a sub-reflecting mirror support portion 7, and a vibration suppressing device 10 (not shown in FIG. 1) for suppressing vibrations of the sub-reflecting mirror support portion 7 and the sub-reflecting mirror 6 This is a support structure of the sub-reflecting mirror that suppresses and supports the sub-reflecting mirror.

トップリング5は、主反射鏡3に対して観測源側の決められた位置にアッパーチューブ4により配置される。副反射鏡6は、トップリング5に対して観測源側の決められた位置に副反射鏡支持部7により配置される。したがって、副反射鏡6は、トップリング5よりも観測源側に主反射鏡3に対して決められた位置に配置される。   The top ring 5 is disposed by the upper tube 4 at a predetermined position on the observation source side with respect to the main reflecting mirror 3. The sub-reflecting mirror 6 is disposed by the sub-reflecting mirror support 7 at a position determined on the observation source side with respect to the top ring 5. Therefore, the sub-reflecting mirror 6 is arranged at a position determined with respect to the main reflecting mirror 3 on the observation source side with respect to the top ring 5.

図2は、この発明の実施の形態1に係る副反射鏡の支持構造が有する副反射鏡支持部の構造を説明する図である。図2(a)が平面図であり、図2(b)が正面図である。副反射鏡支持部7は、副反射鏡6が取付けられる副反射鏡取付部8と、副反射鏡取付部8の角の部分に一端が接続されもう一端がトップリング5の角に接続される6本の棒状体9とを有する。正六角形であるトップリング5の中心を通りトップリング5に垂直な直線上に副反射鏡取付部8の中心が位置するように配置される。トップリング5と6本の棒状体9と副反射鏡取付部8とにより、6個の等脚台形が形成される。副反射鏡取付部8は、外形が正六角形の枠体であり、枠の内部に副反射鏡6が取付けられる棒を有している。   FIG. 2 is a diagram for explaining the structure of the sub-reflecting mirror support portion included in the sub-reflecting mirror support structure according to Embodiment 1 of the present invention. FIG. 2A is a plan view, and FIG. 2B is a front view. The sub-reflecting mirror support section 7 has one end connected to the sub-reflecting mirror mounting section 8 to which the sub-reflecting mirror 6 is mounted and the corner portion of the sub-reflecting mirror mounting section 8, and the other end connected to the corner of the top ring 5. And six rod-like bodies 9. The sub-reflector mounting portion 8 is arranged so that the center of the sub-reflecting mirror mounting portion 8 is positioned on a straight line that passes through the center of the top ring 5 that is a regular hexagon and is perpendicular to the top ring 5. The top ring 5, the six rod-like bodies 9, and the sub-reflecting mirror mounting portion 8 form six isosceles trapezoids. The sub-reflecting mirror mounting portion 8 is a regular hexagonal frame, and has a rod to which the sub-reflecting mirror 6 is mounted inside the frame.

アッパーチューブ4、トップリング5および棒状体9は、断面が円形の管を接続して構成される。管の素材は金属または強化樹脂などである。素材や管厚や管径などは、必要となる剛性や許容できる重量および熱膨張係数の上限などを考慮して決める。断面が円形の管以外で、アッパーチューブ4、トップリング5および棒状体9の何れか少なくとも一つを構成してもよい。   The upper tube 4, the top ring 5, and the rod-shaped body 9 are configured by connecting tubes having a circular cross section. The material of the tube is metal or reinforced resin. The material, pipe thickness, pipe diameter, etc. are determined in consideration of the required rigidity, allowable weight, and upper limit of the thermal expansion coefficient. Other than the tube having a circular cross section, at least one of the upper tube 4, the top ring 5, and the rod-shaped body 9 may be configured.

図3は、この発明の実施の形態1に係る副反射鏡の支持構造が有する副反射鏡支持部とその振動を抑制する振動抑制装置の構造を説明する図である。すべての棒状体9にそれぞれ1個の振動抑制装置10が設けられる。図4に、この発明の実施の形態1に係る副反射鏡の支持構造が有する副反射鏡支持部の振動を抑制する振動抑制装置の構造を説明する拡大図を示す。図3(b)において破線で囲んだ部分を図4では、拡大して示している。振動抑制装置10は、一端が棒状体9に接続された第1の部材11と、第1の部材11のもう一端が接続された回転軸12が設けられた中央の部材13と、中央の部材13に接続されて第1の部材11と決められた角度を持つ方向に設けられた第2の部材14と、第2の部材14の先端に接続された質量体15を有する。回転軸12は、トップリング5と棒状体9の接続点の近くに、トップリング5またはアッパーチューブ4に固定して設けられた軸受け16に回転可能に保持される。この実施の形態では、軸受け16は回転軸12を両側から保持するものを使用している。   FIG. 3 is a view for explaining the structure of the sub-reflecting mirror support portion included in the sub-reflecting mirror support structure according to Embodiment 1 of the present invention and the structure of the vibration suppressing device for suppressing the vibration. All the rod-shaped bodies 9 are each provided with one vibration suppressing device 10. FIG. 4 shows an enlarged view for explaining the structure of the vibration suppressing device that suppresses the vibration of the sub-reflecting mirror support portion included in the sub-reflecting mirror support structure according to Embodiment 1 of the present invention. A portion surrounded by a broken line in FIG. 3B is shown enlarged in FIG. The vibration suppressing device 10 includes a first member 11 having one end connected to the rod-shaped body 9, a central member 13 provided with a rotating shaft 12 to which the other end of the first member 11 is connected, and a central member. 13, a second member 14 provided in a direction having a determined angle with respect to the first member 11, and a mass body 15 connected to the tip of the second member 14. The rotary shaft 12 is rotatably held by a bearing 16 that is fixed to the top ring 5 or the upper tube 4 near the connection point between the top ring 5 and the rod-like body 9. In this embodiment, the bearing 16 is used to hold the rotary shaft 12 from both sides.

第1の部材11、中央の部材13および第2の部材14は、同一平面上に配置される。回転軸12はこの平面に垂直であり、第1の部材11、中央の部材13および第2の部材14がこの平面上で回転する。第1の部材11および第2の部材14の長手方向の向きは、決められた角度を持たせており、質量体15がアッパーチューブ4の外側に出すぎることなく、また回転しても質量体15がアッパーチューブ4などに接触しないようにしている。   The first member 11, the central member 13, and the second member 14 are arranged on the same plane. The rotating shaft 12 is perpendicular to this plane, and the first member 11, the central member 13, and the second member 14 rotate on this plane. The longitudinal direction of the first member 11 and the second member 14 is set at a predetermined angle so that the mass body 15 does not protrude outside the upper tube 4 and can be rotated even if it rotates. 15 does not contact the upper tube 4 or the like.

第1の部材11、中央の部材13および第2の部材14は、梃子の原理で質量体15に働く重力を棒状体9に作用させる梃子体である。回転軸12および軸受け16は、梃子体の支点である。第2の部材14と質量体15との接続点が梃子体の力点であり、第1の部材11と棒状体9との接続点が作用点になる。質量体15の重さ、第1の部材11と第2の部材14の長さは、副反射鏡支持部7および副反射鏡6の振動を許容限度以下に抑制できるように決める。第1の部材は梃子体の支点よりも棒状体側の部分であり、第2の部材は支点よりも質量体側の部分である。   The first member 11, the central member 13, and the second member 14 are insulators that act on the rod-like body 9 with gravity acting on the mass body 15 based on the principle of insulators. The rotating shaft 12 and the bearing 16 are fulcrums of the insulator. The connection point between the second member 14 and the mass body 15 is the power point of the insulator, and the connection point between the first member 11 and the rod-shaped body 9 is the action point. The weight of the mass body 15 and the lengths of the first member 11 and the second member 14 are determined so that the vibrations of the sub-reflecting mirror support 7 and the sub-reflecting mirror 6 can be suppressed to an allowable limit or less. The first member is a portion on the rod-like body side with respect to the fulcrum of the insulator, and the second member is a portion on the mass body side with respect to the fulcrum.

第1の部材11の棒状体9への接続点の位置は、振動抑制効果が最適になるように決める。   The position of the connection point of the first member 11 to the rod-like body 9 is determined so that the vibration suppressing effect is optimized.

棒状体9、第1の部材11、中央の部材13、第2の部材14および質量体15は、主反射鏡3の光軸を含む平面である抑制力作用面上に配置される。したがって、抑制力作用面とトップリング5との2個の交点に、それぞれ1個の振動抑制装置10が設けられる。1個の抑制力作用面上に配置された2個の振動抑制装置10が共に動作して、副反射鏡6の振動を抑制する。   The rod-shaped body 9, the first member 11, the central member 13, the second member 14, and the mass body 15 are disposed on a suppression force acting surface that is a plane including the optical axis of the main reflecting mirror 3. Accordingly, one vibration suppression device 10 is provided at each of the two intersections between the suppression force acting surface and the top ring 5. Two vibration suppression devices 10 arranged on one suppression force acting surface operate together to suppress the vibration of the sub-reflecting mirror 6.

次に動作を説明する。図5は、この発明の実施の形態1に係る副反射鏡の支持構造において、比較例として振動抑制装置が備えられていない場合に外部から加速度が加えられて副反射鏡支持部が変形する様子を説明する図である。図において、変形を分かりやすく表現するために、棒状体9は線で表現する。図5で、変形前の棒状体9の状態を破線で表し、変形後の棒状体9の状態を点線で表す。副反射鏡支持部7に、主反射鏡3の光軸をはさんで対向する2本の棒状体9を含む平面に平行な方向に、図における左から右の向きへの加速度が加えられた場合には、図における左側の棒状体9は中央部が右斜め下側に変位するように変形し、図における右側の棒状体9は中央部が右斜め上側に変位するように変形する。その結果、副反射鏡6の光軸は図における右側の方向にずれることになる。加速度が時間とともに変化すると、副反射鏡支持部7の変形量が増減するように変化し、副反射鏡6の光軸の方向も振動して変化する。副反射鏡6の光軸の方向の変動量を変数θで表現する。   Next, the operation will be described. FIG. 5 shows the sub-reflector support structure according to Embodiment 1 of the present invention, in which the sub-reflector support portion is deformed by an external acceleration applied when a vibration suppression device is not provided as a comparative example. FIG. In the figure, the rod-like body 9 is represented by a line in order to express the deformation in an easy-to-understand manner. In FIG. 5, the state of the rod-shaped body 9 before deformation is represented by a broken line, and the state of the rod-shaped body 9 after deformation is represented by a dotted line. An acceleration from the left to the right in the figure was applied to the sub-reflecting mirror support 7 in a direction parallel to the plane including the two rod-shaped bodies 9 facing each other across the optical axis of the main reflecting mirror 3. In this case, the left rod-shaped body 9 in the figure is deformed so that the center portion is displaced diagonally downward to the right, and the right rod-shaped body 9 in the diagram is deformed so that the central portion is displaced diagonally upward to the right. As a result, the optical axis of the sub-reflecting mirror 6 is shifted in the right direction in the figure. When the acceleration changes with time, the amount of deformation of the sub-reflecting mirror support 7 changes so as to increase or decrease, and the direction of the optical axis of the sub-reflecting mirror 6 also vibrates and changes. The amount of change in the direction of the optical axis of the sub-reflecting mirror 6 is expressed by a variable θ.

図5では、アッパーチューブ4およびトップリング5の剛性は棒状体9よりも十分に大きくトップリング5の位置は変化しないものとして、副反射鏡支持部7の変形だけを示している。実際には、アッパーチューブ4およびトップリング5の位置も変化するが、副反射鏡支持部7の変形は図5の場合と同様になる。   In FIG. 5, only the deformation of the sub-reflector support portion 7 is shown on the assumption that the rigidity of the upper tube 4 and the top ring 5 is sufficiently larger than that of the rod-like body 9 and the position of the top ring 5 does not change. Actually, the positions of the upper tube 4 and the top ring 5 also change, but the deformation of the sub-reflecting mirror support 7 is the same as in the case of FIG.

図6が、この発明の実施の形態1に係る副反射鏡の支持構造において外部から加えられる加速度に対して振動抑制装置により副反射鏡支持部の変形が軽減される様子を説明する図である。図6で、変形前の棒状体9の状態を破線で表し、変形後の棒状体9の状態を実線で表す。2個の質量体15にも副反射鏡支持部7と同じ方向(図における左から右へ向かう方向)の加速度すなわち力が加えられる。図における左側の質量体15に加えられた力は、軸受け16を支点として反時計回りの回転モーメントになり、梃子の原理により、第1の部材11が左側の棒状体9に接続する位置に、図における右斜め下から左斜め上に向かう力を発生させる。左側の棒状体9は中央部が右斜め下側に変位するように変形しているので、右斜め下から左斜め上に向かう力により変形が小さくなる。右側の質量体15に加えられた力は、同様にして、第1の部材11が右側の棒状体9に接続する位置に、図における右斜め上から左斜め下に向かう力を発生させる。右側の棒状体9は中央部が右斜め上側に変位するように変形しているので、右斜め上から左斜め下に向かう力により変形が小さくなる。副反射鏡支持部7の変形が小さくなることにより、副反射鏡支持部7および副反射鏡支持部7に支持された副反射鏡6の光軸の方向の変動量θの振動も許容限度以下に小さくできる。
加速度が加わる方向は、主反射鏡3の光軸をはさんで対向する2本の棒状体9を含む平面に平行な方向とは限らないが、加速度が加わる方向に最も近い方向の2本の棒状体は、図5および図6と同様に変形する。
FIG. 6 is a diagram for explaining a state in which the deformation of the sub-reflecting mirror support portion is reduced by the vibration suppressing device against the acceleration applied from the outside in the sub-reflecting mirror support structure according to Embodiment 1 of the present invention. . In FIG. 6, the state of the rod-shaped body 9 before deformation is represented by a broken line, and the state of the rod-shaped body 9 after deformation is represented by a solid line. The acceleration, that is, the force in the same direction as the sub-reflecting mirror support 7 (the direction from the left to the right in the drawing) is also applied to the two mass bodies 15. The force applied to the mass body 15 on the left side in the drawing becomes a counterclockwise rotational moment with the bearing 16 as a fulcrum, and at the position where the first member 11 is connected to the left rod-like body 9 by the lever principle. A force is generated from the lower right to the upper left in the figure. Since the left bar 9 is deformed so that the center part is displaced to the lower right side, the deformation is reduced by the force from the lower right side to the upper left side. Similarly, the force applied to the right mass 15 generates a force from the upper right to the lower left in the drawing at the position where the first member 11 is connected to the right rod 9. Since the right rod 9 is deformed so that the center part is displaced obliquely upward to the right, the deformation is reduced by the force from diagonally right to diagonally downward to the left. Since the deformation of the sub-reflecting mirror support 7 is reduced, the vibration of the variation amount θ in the direction of the optical axis of the sub-reflecting mirror support 7 and the sub-reflecting mirror 6 supported by the sub-reflecting mirror support 7 is also less than the allowable limit. Can be made smaller.
The direction in which the acceleration is applied is not limited to a direction parallel to the plane including the two rod-like bodies 9 facing each other across the optical axis of the main reflecting mirror 3, but two directions closest to the direction in which the acceleration is applied. The rod-shaped body is deformed similarly to FIGS.

副反射鏡支持部の根元(トップリング5側)に振動抑制装置を設置するので、副反射鏡の近くに振動抑制装置を設置する空間が無い場合でも、振動抑制装置を設置できる。また、風の影響も小さくなるという利点もある。   Since the vibration suppressing device is installed at the base (top ring 5 side) of the sub-reflecting mirror support portion, the vibration suppressing device can be installed even when there is no space for installing the vibration suppressing device near the sub-reflecting mirror. There is also an advantage that the influence of the wind is reduced.

この実施の形態では、すべての棒状体に振動抑制装置を設置したが、加速度が加えられる可能性が最も高い方向の2本の棒状体にだけ振動抑制装置を設けてもよい。副反射鏡支持部が6本の棒状体を有する場合だけでなく、主反射鏡の光軸を含む同一平面上に配置された少なくとも2本の棒状体を有する場合であれば適用できる。トップリングは正六角形であったが、円形や六角形以外の正多角形でもよい。回転軸を梃子体に設けたが、梃子体に軸が通る貫通穴を設けて、梃子体を軸の周りに回転できるようにしてもよい。
質量体と構造部材の間に構造部材に対する質量体の位置が変化する質量体の振動を減衰させる振動減衰装置を備えてもよい。
以上のことは、他の実施の形態にもあてはまる。
In this embodiment, the vibration suppression device is installed on all the rod-shaped bodies, but the vibration suppression device may be provided only on the two rod-shaped bodies in the direction where the possibility that acceleration is most likely applied. This is applicable not only when the sub-reflecting mirror support section has six rod-shaped bodies but also when the sub-reflecting mirror support section has at least two rod-shaped bodies arranged on the same plane including the optical axis of the main reflecting mirror. Although the top ring is a regular hexagon, it may be a regular polygon other than a circle or a hexagon. Although the rotation shaft is provided in the insulator, a through-hole through which the shaft passes may be provided in the insulator so that the insulator can be rotated around the axis.
A vibration damping device may be provided between the mass body and the structural member to attenuate the vibration of the mass body in which the position of the mass body changes with respect to the structural member.
The above also applies to other embodiments.

実施の形態2
実施の形態2は、副反射鏡支持部の棒状体の数が多い場合である。図7は、この発明の実施の形態2に係る副反射鏡の支持構造が有する副反射鏡支持部の構造を説明する図である。図7(a)が平面図であり、図7(b)が正面図である。副反射鏡支持部7Aは、副反射鏡6が取付けられる外形が正六角形の枠体である副反射鏡取付部8Aを有する。副反射鏡取付部8Aは、実施の形態1の場合よりも外形の一辺の長さが少し長く、トップリング5に平行な面内で実施の形態1の場合から90度回転した位置に配置される。副反射鏡取付部8Aの角の部分には2本の棒状体9Aの一端が接続され、2本の棒状体9Aのもう一端はトップリング5の隣接する2個の角にそれぞれ接続する。トップリング5の角には、副反射鏡取付部8Aの隣接する2個の角の部分に接続する2本の棒状体9Aが接続する。12本の棒状体9Aと副反射鏡取付部8Aとトップリング5とにより、トップリング5の一辺を底辺とする6個の二等辺三角形と、副反射鏡取付部8Aの一辺を底辺とする6個の二等辺三角形とが形成される。
Embodiment 2
The second embodiment is a case where the number of rod-like bodies of the sub-reflecting mirror support section is large. FIG. 7 is a view for explaining the structure of the sub-reflecting mirror support portion included in the sub-reflecting mirror support structure according to Embodiment 2 of the present invention. FIG. 7A is a plan view, and FIG. 7B is a front view. The sub-reflecting mirror support portion 7A has a sub-reflecting mirror mounting portion 8A that is a frame having a regular hexagonal outer shape to which the sub-reflecting mirror 6 is mounted. The sub-reflecting mirror mounting portion 8A is slightly longer than the case of the first embodiment, and is arranged at a position rotated 90 degrees from the case of the first embodiment in a plane parallel to the top ring 5. The One end of two rod-shaped bodies 9A is connected to the corner portion of the sub-reflecting mirror mounting portion 8A, and the other end of the two rod-shaped bodies 9A is connected to two adjacent corners of the top ring 5, respectively. Two rod-like bodies 9A connected to two adjacent corner portions of the sub-reflecting mirror mounting portion 8A are connected to the corners of the top ring 5. The six isosceles triangles having the base of one side of the top ring 5 and the base 6 of one side of the sub-reflector mounting part 8A are constituted by the 12 rod-like bodies 9A, the sub-reflecting mirror mounting part 8A and the top ring 5. Isosceles triangles are formed.

図8に、この発明の実施の形態2に係る副反射鏡の支持構造が有する副反射鏡支持部とその振動を抑制する振動抑制装置の構造を説明する図を示す。実施の形態1の場合と比較して、振動抑制装置10Aは第1の部材11Aに2本の棒状体9Aと接続する短い棒の部分が追加されてT字状になっている点が異なり、他の点ではほぼ同じである。第1の部材11Aは一端のTの横線の部分の両端が棒状体9Aに接続し、縦線の端が中央の部材13に接続する。中央の部材13には、回転軸12が設けられる。回転軸12は、軸受け16に回転可能に保持される。第2の部材14は、一端が中央の部材13に接続され、もう一端には質量体15が接続される。   FIG. 8 is a view for explaining the structure of the sub-reflecting mirror support portion included in the sub-reflecting mirror support structure according to Embodiment 2 of the present invention and the structure of the vibration suppressing device that suppresses the vibration. Compared to the case of the first embodiment, the vibration suppressing device 10A is different from the first member 11A in that a portion of a short bar connected to the two rod-like bodies 9A is added to form a T shape, In other respects, it is almost the same. In the first member 11A, both ends of the horizontal line portion of T at one end are connected to the rod-shaped body 9A, and the end of the vertical line is connected to the central member 13. The central member 13 is provided with a rotating shaft 12. The rotating shaft 12 is rotatably held by the bearing 16. One end of the second member 14 is connected to the central member 13, and the mass body 15 is connected to the other end.

中央の部材13、第2の部材14および質量体15は、主反射鏡3の光軸を含む平面である抑制力作用面上に配置される。2本の棒状体9Aは抑制力作用面に対して対称に配置されており、第1の部材11Aも抑制力作用面に対して対称に配置される。したがって、第1の部材11A、中央の部材13および第2の部材14は、梃子の原理で質量体15に働く重力を棒状体9Aに作用させる梃子体である。   The central member 13, the second member 14, and the mass body 15 are disposed on a suppression force acting surface that is a plane including the optical axis of the main reflecting mirror 3. The two rod-like bodies 9A are arranged symmetrically with respect to the restraining force acting surface, and the first member 11A is also placed symmetrically with respect to the restraining force acting surface. Therefore, the first member 11A, the central member 13 and the second member 14 are insulators that act on the rod-like body 9A with gravity acting on the mass body 15 based on the principle of insulators.

この実施の形態2の振動抑制装置も、実施の形態1の場合と同様に動作する。副反射鏡支持部7Aおよび質量体15に同じ方向の力が加えられると、質量体15に加えられた力は梃子体により棒状体9Aの変形を小さくする方向の力として棒状体9Aに作用する。したがって、棒状体9Aを含む副反射鏡支持部7Aの変形が小さくなり、副反射鏡支持部7Aが振動する振動の大きさを小さくできる。ひいては、副反射鏡支持部7Aに支持された副反射鏡6の光軸の傾きの振動も小さくできる。   The vibration suppression apparatus according to the second embodiment also operates in the same manner as in the first embodiment. When a force in the same direction is applied to the sub-reflecting mirror support portion 7A and the mass body 15, the force applied to the mass body 15 acts on the rod-like body 9A as a force in a direction to reduce the deformation of the rod-like body 9A by the insulator. . Therefore, the deformation of the sub-reflecting mirror support portion 7A including the rod-shaped body 9A is reduced, and the magnitude of vibration that the sub-reflecting mirror support portion 7A vibrates can be reduced. As a result, the vibration of the tilt of the optical axis of the sub-reflecting mirror 6 supported by the sub-reflecting mirror support portion 7A can be reduced.

実施の形態1の副反射鏡支持部ではすべての棒状体が主反射鏡の光軸を含む平面上に配置されていた。そして、実施の形態2の副反射鏡支持部は、主反射鏡の光軸を含む平面に対して対称な位置に配置された隣接する棒状体だけを有していた。主反射鏡の光軸を含む平面上に配置された棒状体と、主反射鏡の光軸を含む平面に対して対称な位置に配置された隣接する棒状体とを、ともに持つような副反射鏡支持部に対しても適用できる。加速度が加えられる可能性が最も高い方向に平行な主反射鏡の光軸を含む平面において、その平面上の1本の棒状体またはその平面に対して対称な位置に配置された2本の棒状体の振動を抑制する2個の振動抑制装置を少なくとも備えればよい。多くの方向の主反射鏡の光軸を含む平面に対して振動抑制装置を備えれば、より振動を抑制できるのでその方が望ましい。   In the sub-reflecting mirror support portion of the first embodiment, all the rod-shaped bodies are arranged on a plane including the optical axis of the main reflecting mirror. And the sub-reflecting mirror support part of Embodiment 2 had only the adjacent rod-shaped body arrange | positioned in the symmetrical position with respect to the plane containing the optical axis of a main reflecting mirror. A sub-reflection that has both a rod-like body arranged on a plane including the optical axis of the main reflector and an adjacent rod-like body arranged at a symmetric position with respect to the plane containing the optical axis of the main reflector. It can also be applied to a mirror support. In a plane including the optical axis of the main reflector parallel to the direction where acceleration is most likely to be applied, one bar on the plane or two bars arranged at positions symmetrical to the plane What is necessary is just to provide the two vibration suppression apparatuses which suppress the vibration of a body at least. If a vibration suppressing device is provided for a plane including the optical axis of the main reflecting mirror in many directions, it is more preferable because vibration can be further suppressed.

実施の形態3
実施の形態3は、振動抑制装置の質量体と構造部材との間に振動減衰装置を設けた場合である。図9に、この発明の実施の形態3に係る副反射鏡の支持構造が有する副反射鏡支持部の振動を抑制する振動抑制装置の構造を説明する図を示す。実施の形態1と比較して、振動抑制装置の構成だけを変更している。
Embodiment 3
The third embodiment is a case where a vibration damping device is provided between the mass body of the vibration suppressing device and the structural member. FIG. 9 is a view for explaining the structure of a vibration suppressing device that suppresses vibration of the sub-reflecting mirror support portion of the sub-reflecting mirror support structure according to Embodiment 3 of the present invention. Compared to the first embodiment, only the configuration of the vibration suppressing device is changed.

振動抑制装置10Bは、質量体15とアッパーチューブ4との間に振動減衰装置17を有している。振動減衰装置17は、構造部材であるアッパーチューブ4と質量体15との間の距離が変化する振動に対して、振動が早く減衰するような力を質量体15に加える。振動減衰装置17を備えることにより、副反射鏡支持部および副反射鏡の光軸の傾きの振動をより小さくすることができる。   The vibration suppression device 10 </ b> B includes a vibration damping device 17 between the mass body 15 and the upper tube 4. The vibration damping device 17 applies a force to the mass body 15 so that the vibration is quickly attenuated with respect to the vibration in which the distance between the upper tube 4 that is a structural member and the mass body 15 changes. By providing the vibration attenuating device 17, it is possible to further reduce the vibration of the tilt of the optical axis of the sub-reflecting mirror support section and the sub-reflecting mirror.

図10は、この発明の実施の形態3に係る副反射鏡の支持構造が有する副反射鏡支持部の振動を抑制する振動抑制装置の振動減衰装置の種類を記号により表現した図である。図10では、棒状体9や振動抑制装置10Bの第1の部材11および第2の部材14などを線で表現している。図10(a)に示すように、オイルダンパーや磁気ダンパーなど振動に対して振動を抑制する力を受動的に発生させる振動減衰装置17Aでもよい。また、図10(b)に示すように、電動アクチュエータやボイスコイルなどのように検知した振動を効果的に抑制できるような力を能動的に発生させる振動減衰装置17Bでもよい。   FIG. 10 is a diagram expressing the types of vibration damping devices of the vibration suppressing device for suppressing the vibration of the sub-reflecting mirror support portion included in the sub-reflecting mirror support structure according to Embodiment 3 of the present invention using symbols. In FIG. 10, the rod-like body 9, the first member 11 and the second member 14 of the vibration suppressing device 10 </ b> B, and the like are represented by lines. As shown in FIG. 10A, a vibration damping device 17A such as an oil damper or a magnetic damper that passively generates a force for suppressing vibration against vibration may be used. Further, as shown in FIG. 10B, a vibration damping device 17B that actively generates a force capable of effectively suppressing the detected vibration, such as an electric actuator or a voice coil, may be used.

振動減衰装置は、アッパーチューブではない構造部材と質量体との間に設けてもよい。振動抑制装置の振動を抑制する原理はどのようなものでもよく、構造部材に対する質量体の振動を抑制できるものであれば、どのようなものでもよい。実施の形態2および示していない形態の振動抑制装置に、振動減衰装置を備えるようにしてもよい。   The vibration damping device may be provided between the structural member that is not the upper tube and the mass body. The principle of suppressing the vibration of the vibration suppressing device may be any, and any principle may be used as long as the vibration of the mass body with respect to the structural member can be suppressed. You may make it equip the vibration suppression apparatus of Embodiment 2 and the form which is not shown with a vibration damping device.

1 アジマス架台
2 エレベーション回転台
3 主反射鏡
4 アッパーチューブ(構造部材)
5 トップリング(環状体)
6 副反射鏡
7、7A 副反射鏡支持部
8、8A 副反射鏡取付部
9、9A 棒状体
10、10A、10B 振動抑制装置
11、11A 第1の部材
12 回転軸
13 中央の部材
14 第2の部材
15 質量体
16 軸受け
17、17A、17B 振動減衰装置
1 Azimuth Mount 2 Elevation Turntable 3 Main Reflector 4 Upper Tube (Structural Member)
5 Top ring (annular)
6 Sub-reflecting mirror 7, 7A Sub-reflecting mirror support portion 8, 8A Sub-reflecting mirror mounting portion 9, 9A Rod-shaped body 10, 10A, 10B Vibration suppression device 11, 11A First member 12 Rotating shaft 13 Central member 14 Second 15 Mass body 16 Bearing 17, 17A, 17B Vibration damping device

Claims (5)

観測源からの観測波を反射する主反射鏡に対して前記観測源側の決められた位置に配置された環状体と、
前記環状体よりも前記観測源側に前記主反射鏡に対して決められた位置に前記主反射鏡に対向して配置され、前記主反射鏡で反射された前記観測波を反射する副反射鏡が取付けられる副反射鏡取付部、一端が前記副反射鏡取付部に接続され他端が前記環状体に接続される複数の棒状体を有し、前記副反射鏡を前記主反射鏡に対して決められた位置に配置する副反射鏡支持部と、
前記主反射鏡の光軸を含む平面である抑制力作用面と前記環状体との2個の交点のそれぞれにおいて、前記交点に一端が接続されて前記抑制力作用面上に配置された1本の前記棒状体、あるいは、前記交点に一端が接続されて前記抑制力作用面に対称に配置された2本の前記棒状体に一方の側が接続され、他方の側に決められた重さの質量体が接続された梃子体、前記交点の近傍に設けられた前記梃子体の支点とを有する、前記副反射鏡支持部の振動を抑制する振動抑制装置とを備えた副反射鏡の支持構造。
An annular body arranged at a predetermined position on the observation source side with respect to a main reflector that reflects an observation wave from the observation source;
A sub-reflecting mirror disposed opposite to the main reflecting mirror at a position determined with respect to the main reflecting mirror closer to the observation source than the annular body and reflecting the observation wave reflected by the main reflecting mirror A sub-reflector mounting portion to which the sub-reflector is attached, a plurality of rod-shaped bodies having one end connected to the sub-reflector mounting portion and the other end connected to the annular body, A sub-reflecting mirror support unit disposed at a predetermined position;
One of the two intersections of the restraining force acting surface, which is a plane including the optical axis of the main reflecting mirror, and the annular body, one end of which is connected to the intersection and arranged on the restraining force acting surface. One end of the rod-shaped body, or one end connected to the intersecting point and symmetrically arranged on the restraining force acting surface is connected to one side, and the mass of the weight determined on the other side A sub-reflector support structure comprising: a lever body connected to a body; and a vibration suppression device that suppresses vibrations of the sub-reflector support portion, and has a lever support point provided near the intersection.
前記梃子体は、前記支点よりも前記棒状体の側の部分である第1の部材、前記第1の部材と決められた角度を持つ前記支点よりも前記質量体の側の部分である第2の部材を有する
ことを特徴とする請求項1に記載の副反射鏡の支持構造。
The insulator is a first member that is a portion of the rod-shaped body with respect to the fulcrum, and a second member that is a portion of the mass body with respect to the fulcrum having an angle determined with the first member. The support structure for a sub-reflecting mirror according to claim 1, further comprising:
前記主反射鏡に対して決められた位置に配置された構造部材と前記質量体との間に、前記構造部材に対する前記質量体の振動を減衰させる振動減衰装置を備えた
ことを特徴とする請求項1または請求項2に記載の副反射鏡の支持構造。
A vibration attenuating device for attenuating vibration of the mass body with respect to the structural member is provided between the structural member and the mass body arranged at a predetermined position with respect to the main reflecting mirror. The support structure for a sub-reflecting mirror according to claim 1 or 2.
前記振動減衰装置は、振動を検出して、検出した振動が減衰する力を発生させるものである
ことを特徴とする請求項3に記載の副反射鏡の支持構造。
4. The sub-reflecting mirror support structure according to claim 3, wherein the vibration attenuating device detects vibration and generates a force that attenuates the detected vibration.
前記振動抑制装置をすべての前記棒状体に対して設けた
ことを特徴とする請求項1から請求項4のいずれか1項に記載の副反射鏡の支持構造。
The support structure for a sub-reflecting mirror according to any one of claims 1 to 4, wherein the vibration suppressing device is provided for all the rod-shaped bodies.
JP2013243509A 2013-11-26 2013-11-26 Support structure of sub reflection mirror Pending JP2015102703A (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113589517A (en) * 2021-08-11 2021-11-02 哈尔滨工业大学 Separable modular sub-mirror structure of large-scale space telescope and on-orbit replacement method

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113589517A (en) * 2021-08-11 2021-11-02 哈尔滨工业大学 Separable modular sub-mirror structure of large-scale space telescope and on-orbit replacement method

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