JPH0420913A - Reflection mirror supporting mechanism for telescope - Google Patents
Reflection mirror supporting mechanism for telescopeInfo
- Publication number
- JPH0420913A JPH0420913A JP12402790A JP12402790A JPH0420913A JP H0420913 A JPH0420913 A JP H0420913A JP 12402790 A JP12402790 A JP 12402790A JP 12402790 A JP12402790 A JP 12402790A JP H0420913 A JPH0420913 A JP H0420913A
- Authority
- JP
- Japan
- Prior art keywords
- reflection mirror
- reflecting mirror
- support
- supporting
- flange
- 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.)
- Granted
Links
- 239000002184 metal Substances 0.000 claims abstract description 13
- 239000000463 material Substances 0.000 claims abstract description 4
- 229920001887 crystalline plastic Polymers 0.000 claims description 5
- 229920005177 Duracon® POM Polymers 0.000 abstract description 6
- 230000003028 elevating effect Effects 0.000 abstract 1
- 239000011521 glass Substances 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000011536 re-plating Methods 0.000 description 2
- 230000002411 adverse Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
Landscapes
- Telescopes (AREA)
Abstract
Description
【発明の詳細な説明】
〈産業上の利用分野〉
この発明は望遠鏡の反射鏡支持機構、特に大型反射天体
望遠鏡の主反射鏡の支持機構に関する。DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to a supporting mechanism for a reflecting mirror of a telescope, and particularly to a supporting mechanism for a main reflecting mirror of a large reflecting astronomical telescope.
〈従来の技術及び発明が解決しようとする課題〉従来の
望遠鏡の反射鏡支持機構としては、例えば第６図及び第
７図に示すようなものが知られている。■が大型反射天
体望遠鏡で、この大型反射天体望遠鏡１の鏡筒２内の底
部に主反射鏡３が金属製のケース４に収納された状態で
支持されている。この主反射鏡３とケース４との間にク
リアランス（隙間）があると、主反射鏡３の光軸Ａがず
れるため、両者を隙間なく密着状態にする要請がある。<Prior Art and Problems to be Solved by the Invention> As a conventional reflecting mirror support mechanism for a telescope, the one shown in FIGS. 6 and 7, for example, is known. 3 is a large reflecting astronomical telescope, and a main reflecting mirror 3 is housed in a metal case 4 and supported at the bottom of the lens barrel 2 of this large reflecting astronomical telescope 1. If there is a clearance (gap) between the main reflecting mirror 3 and the case 4, the optical axis A of the main reflecting mirror 3 will be shifted, so there is a demand for the two to be in close contact with each other without any gaps.
ところが一方で、主反射鏡３がガラス製であり、金属製
のケース４と熱膨張率が相違するために、クリアランス
を全く無くすと、温度によっては、主反射鏡３がケース
４により締付けられて、主反射鏡３の反射面３ａに歪み
を起こして反射像に悪影響を及ぼしたり、或いは最悪の
場合は主反射鏡３が割れてしまうこともあり得る。However, since the main reflector 3 is made of glass and has a different thermal expansion coefficient from the metal case 4, if there is no clearance at all, the main reflector 3 may be tightened by the case 4 depending on the temperature. , the reflection surface 3a of the main reflection mirror 3 may be distorted, which may adversely affect the reflected image, or in the worst case, the main reflection mirror 3 may be broken.
このように、主反射鏡３の支持には前述の如き相反する
２つの要請を満足させる必要があるが、出願人の知ると
ころでは、上記の如き要請を完全に満足する反射鏡支持
機構はなかった。As described above, supporting the main reflecting mirror 3 requires satisfying the two conflicting requirements as described above, but to the applicant's knowledge, there is no reflecting mirror support mechanism that completely satisfies the above requirements. Ta.
この発明はこのような従来の技術に着目してなされたも
のであり、前記の如き要請を完全に満足させることがで
きる望遠鏡の反射鏡支持機構を提供せんとするものであ
る。The present invention has been made by paying attention to such conventional techniques, and it is an object of the present invention to provide a reflecting mirror support mechanism for a telescope that can completely satisfy the above-mentioned requirements.
〈課題を解決するための手段〉
この発明に係る望遠鏡の反射鏡支持機構は、上記の目的
を達成するために、支持フランジ上の一定高さ位置に配
された反射鏡の外側面を、支持フランジの等角三方位置
に配した支持体により当接支持するものであって、その
支持体が金属よりも熱膨張率の高い材質製であることを
要旨としている。<Means for Solving the Problems> In order to achieve the above object, the telescope reflector support mechanism according to the present invention supports the outer surface of the reflector disposed at a constant height on the support flange. The flange is abutted and supported by supports arranged at equiangular positions on three sides of the flange, and the gist is that the supports are made of a material with a higher coefficient of thermal expansion than metal.
く実 施 例〉
以下、この発明の好適な一実施例を第１図〜第５図に基
づいて説明する。尚、従来と共通する部分には同一の符
号を付し、重複する説明は省略する。Embodiment> Hereinafter, a preferred embodiment of the present invention will be described based on FIGS. 1 to 5. Incidentally, the same reference numerals are given to the parts common to the conventional one, and redundant explanation will be omitted.
この実施例に係る大型反射天体望遠鏡の鏡筒５は、組立
或いは分解のために昇降装置６の上に垂直状態で載せし
れた状態となっている（第２図参照）。そして、７は支
持フランジで、鏡筒５の底部に取付けられる。この支持
フランジ７上には、等角三方位置に湾曲状の受板８が取
外し自在に立設されている。そして、この各受板８には
主反射鏡３の外側面に当接する「結晶性プラスチック」
であるジュラコン（商品名）製の支持体９が２個づつ取
付けである。The lens barrel 5 of the large reflective astronomical telescope according to this embodiment is placed vertically on a lifting device 6 for assembly or disassembly (see FIG. 2). A support flange 7 is attached to the bottom of the lens barrel 5. On this support flange 7, curved receiving plates 8 are removably erected at equiangular three positions. Each receiving plate 8 is made of "crystalline plastic" that comes into contact with the outer surface of the main reflecting mirror 3.
Two supports 9 made of Duracon (trade name) are attached.
また、支持フランジ７の底面の等角三方位置には、主反
射鏡３を載せて水平度の調整を図るための載置台１０が
ネジ１１にて上下動自在に螺合されている。主反射鏡３
は主反射鏡３の取付作業上の理由から、人の手が入るく
らいの一定高さＬが必要であるため、この載置台１０に
載せることにより、前記高さしの確保と水平度の維持を
図っている。Further, a mounting table 10 on which the main reflecting mirror 3 is mounted and for adjusting the horizontality is screwed into the bottom surface of the support flange 7 at equiangular triangular positions with screws 11 so as to be movable up and down. Main reflector 3
Due to the work involved in installing the main reflector 3, a certain height L is required that allows a person to reach it. We are trying to
そして、外側面が支持体９にて支持され且つ底面が載置
台１０にて支持された状態の主反射鏡３は、環状体１２
によりその外周上部が押さえられる。すなわち、環状体
１２に設けられた３本の脚部１３を支持フランジ７設け
た取付孔１４に上側から挿入し、その脚部１３の下端に
ナツト１５を取付けることにより、主反射鏡３の支持は
完了する。The main reflecting mirror 3, whose outer surface is supported by the support 9 and whose bottom surface is supported by the mounting table 10, has an annular body 12.
The upper part of the outer periphery is pressed down. That is, the three legs 13 provided on the annular body 12 are inserted from above into the mounting holes 14 provided with the support flange 7, and the nuts 15 are attached to the lower ends of the legs 13, thereby supporting the main reflecting mirror 3. is completed.
熱膨張 策（第３図（ａ）〜（Ｃ）照）次に、上記如き
主反射鏡３の支持機構における熱膨張対策を第３図（ａ
）〜（Ｃ）を用いて説明する。Measures against thermal expansion (see Figures 3(a) to (C)) Next, measures against thermal expansion in the support mechanism for the main reflecting mirror 3 as described above are shown in Figure 3(a).
) to (C).
説明の便宜上、従来の金属製支持体１６を用いた比較例
を第３図（ａ）と第３図（ｂ）に示した。第３図（ａ）
は、金属製支持体１６を主反射鏡３の外側面に密着させ
て支持した状態と示している。そして、この第３図（ａ
）の状態から、主反射鏡３の周辺温度が上昇すると、第
３図（ｂ）に示すように、ガラス製の主反射鏡３よりも
、金属製である支持フランジ７の熱膨張率の方が大きい
ため、支持フランジ７が外側へ膨張する長さｄｌが、主
反射鏡３が外側へ膨張する長さｄ２よりも大きくなり、
結果として金属製支持体１６と主反射鏡３との間にはほ
ぼｄｉ−ｄ２に相当する隙間ｄ３が生じてしまう。For convenience of explanation, a comparative example using a conventional metal support 16 is shown in FIGS. 3(a) and 3(b). Figure 3(a)
1 shows a state in which the metal support 16 is supported in close contact with the outer surface of the main reflecting mirror 3. And this figure 3 (a
), when the surrounding temperature of the main reflecting mirror 3 increases, as shown in FIG. 3(b), the coefficient of thermal expansion of the support flange 7 made of metal becomes higher than that of the main reflecting mirror 3 made of glass is large, the length dl by which the support flange 7 expands outward becomes larger than the length d2 by which the main reflecting mirror 3 expands outward,
As a result, a gap d3 approximately corresponding to di-d2 is created between the metal support 16 and the main reflecting mirror 3.
金属製支持体１６自体も内側の主反射鏡３へ向けて若干
熱膨張を起こすが、支持フランジ７の熱膨張の方が圧倒
的に大きいため、前記隙間ｄ３をキャンセルす、る（う
める）はどのものではない。ところが、第３図（Ｃ）に
示した本発明に係るジュラコン（商品名）製の支持体９
は、熱膨張率がガラス等に比べて大変に大きいため、支
持体９自体が内側の主反射鏡３へ向けて大きく熱膨張を
起こし、前記隙間ｄ３をうめることができる。従って、
低温時も高温時もジュラコン（商品名）製の支持体９は
常に主反射鏡３の外側面に当接し、主反射鏡３を確実に
支持することができる。尚、支持体９の熱膨張が追いつ
かない程の急激な温度変化に対しては、支持体３の形状
により対応することができる。すなわち、この支持体３
の当接面には非接触状態となる凹部１７が、また支持体
９の背面と受板８との間には所定の隙間Ｉ！（第１図参
照）が、それぞれ設けられているため、主反射鏡３の周
辺温度が急激に低下し、支持体９が強い力で主反射鏡３
の外側面に押しつけられるような状況になっても、支持
体９がたわみ変形し易く、主反射鏡３の歪み変形や破損
を回避することができる。The metal support 16 itself also undergoes some thermal expansion toward the inner main reflecting mirror 3, but the thermal expansion of the support flange 7 is overwhelmingly larger, so the gap d3 is canceled out. Not which one. However, the support body 9 made of Duracon (trade name) according to the present invention shown in FIG. 3(C)
Since the coefficient of thermal expansion is much larger than that of glass or the like, the support body 9 itself causes a large thermal expansion toward the main reflecting mirror 3 on the inside, and can fill the gap d3. Therefore,
The support body 9 made of DURACON (trade name) always comes into contact with the outer surface of the main reflecting mirror 3 both at low temperatures and at high temperatures, and can support the main reflecting mirror 3 reliably. Note that the shape of the support 3 can be used to cope with sudden changes in temperature that the thermal expansion of the support 9 cannot keep up with. That is, this support 3
There is a recess 17 on the abutting surface of the support plate 9 which is in a non-contact state, and a predetermined gap I! between the back surface of the support body 9 and the receiving plate 8! (See Figure 1) are provided respectively, so the temperature around the main reflecting mirror 3 drops rapidly, and the support body 9 applies a strong force to the main reflecting mirror 3.
Even if the main reflecting mirror 3 is pressed against the outer surface of the main reflecting mirror 3, the supporting member 9 easily bends and deforms, thereby avoiding distortion and breakage of the main reflecting mirror 3.
次に、主反射鏡３の組立・分解について説明する。Next, assembly and disassembly of the main reflecting mirror 3 will be explained.
組 立（第４図参照）
前述のように主反射鏡３を支持フランジ７上の一定高さ
しで且つ水平に支持させる必要があるため、主反射鏡３
の組立には前記高さしに相当する高さのブロックゲージ
Ｂを用いる。すなわち、まず支持フランジ７上の等角三
方位置にブロックゲージＢをセットし、その上に主反射
鏡３を載せる。Assembly (see Figure 4) As mentioned above, it is necessary to support the main reflecting mirror 3 horizontally at a certain height on the support flange 7, so the main reflecting mirror 3
For the assembly, a block gauge B having a height corresponding to the above-mentioned height gauge is used. That is, first, the block gauge B is set at equiangular triangular positions on the support flange 7, and the main reflecting mirror 3 is placed on it.
この主反射鏡３をブロックゲージＢの上に載せた状態で
は、一定高さしと水平度は完全に保たれている。そして
、この状態から支持フランジ７に螺合しである載置台１
０のネジ１１を回して、載置台ｌＯを徐々に上昇させ、
各載置台１０の上部を主反射鏡３の底部へ接触させた状
態とする。そして、その後ブロックゲージＢを取り外せ
ば、載置台１０がブロックゲージＢの代わりとなり、前
記高さし及び水平度の確保はそのまま載置台ｌＯに引き
継がれることとなる。When the main reflecting mirror 3 is placed on the block gauge B, a constant height and horizontality are maintained perfectly. From this state, the mounting table 1 is screwed onto the support flange 7.
Turn the screw 11 of 0 to gradually raise the mounting table lO,
The upper part of each mounting table 10 is brought into contact with the bottom of the main reflecting mirror 3. Then, if the block gauge B is removed thereafter, the mounting table 10 will take the place of the block gauge B, and the above-mentioned height and leveling will be taken over by the mounting table 10 as it is.
分 解（第５ 参照）
主反射鏡３は反射面３ａの再メツキ等のために時々鏡筒
５から取外す必要がある。このような場合には、鏡筒５
を昇降装置６の上にセットした後に、支持フランジ７を
鏡筒５から外し、昇降装置６を下げて支持フランジ７だ
けを取り出す。そして、取り出した支持フランジ７がら
環状体１２と受板８をそれぞれ取り外す。そうすると、
主反射鏡３は載置台ｌＯの上に載せられただけの状態と
なるが、主反射鏡３の一定高さＬは維持されているため
に、この高さＬに相当する部分に手を入れて主反射鏡３
を容易に持ち上げて、そのままメツキ作業現場へ運ぶこ
とできる。従来はこの高さＬを設けるような考慮がなさ
れていなかったため主反射鏡３の取外しに４〜５人の作
業員を要しが、本発明の場合だと１人で分解して持ち運
ぶことができる。尚、６０ｃｍ以上の主反射鏡だと重量
が１００ｋｇを越えるので、その場合には２人必要とな
る。尚、上記の説明では主反射鏡を例としたが、本発明
は副反射鏡にも適用できる。Disassembly (see No. 5) The main reflecting mirror 3 needs to be removed from the lens barrel 5 from time to time for re-plating of the reflecting surface 3a, etc. In such a case, the lens barrel 5
is set on the lifting device 6, the support flange 7 is removed from the lens barrel 5, the lifting device 6 is lowered, and only the support flange 7 is taken out. Then, the annular body 12 and the receiving plate 8 are removed from the support flange 7 that has been taken out. Then,
The main reflector 3 is simply placed on the mounting table lO, but since the constant height L of the main reflector 3 is maintained, the portion corresponding to this height L must be touched. Main reflector 3
It can be easily lifted up and carried directly to the work site. Conventionally, consideration was not given to providing this height L, so it required 4 to 5 workers to remove the main reflector 3, but in the case of the present invention, it can be disassembled and carried by one person. can. In addition, if the main reflector is 60 cm or more, the weight exceeds 100 kg, so two people are required in that case. In addition, although the main reflecting mirror was used as an example in the above description, the present invention can also be applied to a sub-reflecting mirror.
尚、以上の説明において、結晶性プラスチックとしてジ
ュラコン（商品名）を例としたが、金属よりも熱膨張率
が高ければジュラコン（商品名）でなくても良い。In the above description, DURACON (trade name) was used as an example of the crystalline plastic, but it does not need to be DURACON (trade name) as long as it has a higher coefficient of thermal expansion than metal.
〈発明の効果〉
この発明に係る望遠鏡の反射鏡支持機構は、以上説明し
てきた如き内容のものなので、反射鏡の周辺温度が変化
しても反射鏡の反射面が歪んだり或いは光軸がズしたり
することがない。また、主反射鏡の組立分解も容易で、
反射鏡の再メツキ等を容易に行なえる。<Effects of the Invention> Since the reflecting mirror support mechanism of the telescope according to the present invention has the content as explained above, even if the ambient temperature of the reflecting mirror changes, the reflecting surface of the reflecting mirror will not be distorted or the optical axis will be shifted. There's nothing to do. In addition, it is easy to assemble and disassemble the main reflector.
Re-plating of the reflecting mirror can be done easily.
第１図はこの発明の一実施例に係る反射鏡支持機構の斜
視図、
第２図は反射鏡支持機構を昇降装置に載せた状態を示す
側面図、
第３図（ａ）は金属製支持体を用いた場合の比較例を示
す反射鏡及び支持フランジの側面図、第３図（ｂ）は高
温時の状態を示す第３図（ａ）相当の側面図、
第３図（Ｃ）は結晶性プラスチック製の支持体を用いた
場合を示す第３図（ｂ）相当の側面図、第４図は反射鏡
をブロックゲージに載せた状態を示す側面図、
第５図は支持フランジを鏡筒から外した状態を示す側面
図、
第６図は従来の大型反射天体望遠鏡を示す側面図、そし
て
第７図は従来の反射鏡支持機構を示す側面図である。
３ ・−主反射鏡
７−・ 支持フランジ
９− 支持体
Ｌ −・・−高さ
第
図
第
５図Fig. 1 is a perspective view of a reflector support mechanism according to an embodiment of the present invention, Fig. 2 is a side view showing the reflector support mechanism mounted on a lifting device, and Fig. 3(a) is a metal support. Fig. 3(b) is a side view of a reflector and support flange showing a comparative example when a body is used; Fig. 3(b) is a side view corresponding to Fig. 3(a) showing the state at high temperature; Fig. 3(C) A side view equivalent to Fig. 3(b) showing the case where a support made of crystalline plastic is used, Fig. 4 is a side view showing a state in which the reflector is placed on a block gauge, and Fig. 5 is a side view equivalent to Fig. 3 (b) showing the case where a support made of crystalline plastic is used. FIG. 6 is a side view showing a conventional large reflecting astronomical telescope, and FIG. 7 is a side view showing a conventional reflecting mirror support mechanism. 3 - Main reflecting mirror 7 - Support flange 9 - Support L - - Height diagram Figure 5
Claims (2)
の外側面を、支持フランジの等角三方位置に配した支持
体により当接支持する望遠鏡の反射鏡支持機構であって
、 上記支持体が金属よりも熱膨張率の高い材質製であるこ
とを特徴とする反射鏡支持機構。(1) A telescope reflector support mechanism in which the outer surface of a reflector placed at a constant height on a support flange is abutted and supported by supports placed at equiangular triangular positions on the support flange, comprising: A reflector support mechanism characterized in that the support is made of a material with a higher coefficient of thermal expansion than metal.
チックである請求項１記載の反射鏡支持機構。(2) The reflecting mirror support mechanism according to claim 1, wherein the material having a higher coefficient of thermal expansion than metal is a crystalline plastic.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12402790A JPH0420913A (en) | 1990-05-16 | 1990-05-16 | Reflection mirror supporting mechanism for telescope |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12402790A JPH0420913A (en) | 1990-05-16 | 1990-05-16 | Reflection mirror supporting mechanism for telescope |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0420913A true JPH0420913A (en) | 1992-01-24 |
| JPH0536766B2 JPH0536766B2 (en) | 1993-05-31 |
Family
ID=14875224
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12402790A Granted JPH0420913A (en) | 1990-05-16 | 1990-05-16 | Reflection mirror supporting mechanism for telescope |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0420913A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100671946B1 (en) * | 2005-05-27 | 2007-01-19 | 박금순 | Reflecting telescope equipped with moving means for main mirror |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5317624B2 (en) * | 2008-10-17 | 2013-10-16 | キヤノン株式会社 | Retaining device, telescope and optical device |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6124710U (en) * | 1984-07-19 | 1986-02-14 | 株式会社 高橋製作所 | Temperature compensation device in reflecting telescope |
| JPH01287621A (en) * | 1988-05-16 | 1989-11-20 | Mitsubishi Electric Corp | Mirror supporting mechanism |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS54143132A (en) * | 1978-04-14 | 1979-11-08 | Canon Inc | Control grid of corona discharger and production thereof |
-
1990
- 1990-05-16 JP JP12402790A patent/JPH0420913A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6124710U (en) * | 1984-07-19 | 1986-02-14 | 株式会社 高橋製作所 | Temperature compensation device in reflecting telescope |
| JPH01287621A (en) * | 1988-05-16 | 1989-11-20 | Mitsubishi Electric Corp | Mirror supporting mechanism |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100671946B1 (en) * | 2005-05-27 | 2007-01-19 | 박금순 | Reflecting telescope equipped with moving means for main mirror |
Also Published As
| Publication number | Publication date |
|---|---|
| JPH0536766B2 (en) | 1993-05-31 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US3912380A (en) | Composite type structure for large reflective mirrors | |
| US8801357B2 (en) | System for removing a display unit from a multi panel display | |
| JP5079922B1 (en) | Bracket, mounting system and pattern | |
| JP2011013687A (en) | Assembly of optical element and mount | |
| US20170153552A1 (en) | Mirror module, in particular for a microlithographic projection exposure appararatus | |
| CN102548326B (en) | Electronic device | |
| JPH0420913A (en) | Reflection mirror supporting mechanism for telescope | |
| JP2739870B2 (en) | Fixing device for exterior plates | |
| CN102955345A (en) | Jactat caroline | |
| CN219625791U (en) | Heat-eliminating off-axis reflective collimator and optical-mechanical system | |
| US20020054277A1 (en) | Apparatus for compensating engine location for projection monitor | |
| JPH06175062A (en) | Polygon mirror | |
| JP2006154325A (en) | Support structure for optical sheet or the like and display device with same support structure | |
| Ren et al. | Optimum support scheme with fringe moment on the large clear aperture of transmitting mirror | |
| EP1743480B1 (en) | Structure for mounting a light engine in a projection display | |
| JPH04345158A (en) | Mirror fixing method | |
| JPH07239431A (en) | Optical element holding device | |
| JP5116726B2 (en) | Exposure apparatus and device manufacturing method | |
| US20070222904A1 (en) | Attachment System for Holding a Mirror in a Projection Display | |
| CN217689582U (en) | Polarization beam splitting far-infrared prism with high extinction ratio | |
| CN212912213U (en) | Multi-functional convenient music stand of adjusting | |
| JPH01225917A (en) | Liquid crystal display device | |
| JPH07324403A (en) | External wall panel position adjusting method | |
| KR100531384B1 (en) | device for adjusting tilt of optical system in display | |
| JP2584526Y2 (en) | Flat mirror mounting device for projector |