JP2721972B2 - Particle elimination method of plastic screen for projection and screen vibration mechanism therefor - Google Patents
Particle elimination method of plastic screen for projection and screen vibration mechanism thereforInfo
- Publication number
- JP2721972B2 JP2721972B2 JP63151808A JP15180888A JP2721972B2 JP 2721972 B2 JP2721972 B2 JP 2721972B2 JP 63151808 A JP63151808 A JP 63151808A JP 15180888 A JP15180888 A JP 15180888A JP 2721972 B2 JP2721972 B2 JP 2721972B2
- Authority
- JP
- Japan
- Prior art keywords
- screen
- vibration
- vibration mechanism
- vibrator
- plastic
- 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
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- Overhead Projectors And Projection Screens (AREA)
Description
【発明の詳細な説明】 〔発明の利用分野〕 本発明は振動により映像スクリーンの粒子を消去する
方法及びそのためのスクリーンの振動機構に関する。Description: FIELD OF THE INVENTION The present invention relates to a method for erasing particles on a video screen by vibration and a vibration mechanism of the screen for the method.
半透明のシート状薄膜スクリーンにスライドなどの映
像を投映する場合に、スクリーンを振動させると見かけ
上、スクリーンの粒子が消え、鮮明な映像が得られるこ
とは良く知られている。そのための振動手段にはいろい
ろな方法があるが、それぞれに以下のような欠点があ
る。It is well known that, when an image such as a slide is projected on a translucent sheet-like thin film screen, when the screen is vibrated, particles of the screen are apparently removed and a clear image is obtained. There are various methods of vibrating for this purpose, but each has the following disadvantages.
スクリーンを上下、左右に振動させるものは振動の起
動部分から離れるにつれて振幅が大きくなり、また、振
動が偏向し、スクリーン全体に均質な映像を映し出すこ
とができない。また、スクリーンの複数個所に起動部を
設ける方式は各起動部の振動は干渉し、かえって好まし
くない。しかも、複数の駆動装置が必要になるコスト高
になる。When the screen is vibrated up and down and left and right, the amplitude increases as the distance from the starting portion of the vibration increases, and the vibration is deflected, and a uniform image cannot be displayed on the entire screen. Also, a method in which the starting portions are provided at a plurality of places on the screen is not preferable because the vibration of each starting portion interferes. In addition, the cost becomes high, requiring a plurality of driving devices.
円盤状のスクリーンを中心を支点にして回転させる形
式のものはスクリーンの有効使用面が小さくなるため装
置が相対的に大型となり、また、駆動モータの消費電力
が多くなるという問題がある。In the case of a type in which a disk-shaped screen is rotated around a center as a fulcrum, there is a problem that an effective use surface of the screen is reduced, so that the device becomes relatively large, and power consumption of a drive motor increases.
本発明の第１の目的は電力消費の少ない一個のモータ
でスクリーン全体に均一な微振動を与えることができる
映像スクリーンの粒子消去方法を提供することにある。SUMMARY OF THE INVENTION It is a first object of the present invention to provide a method for erasing particles on an image screen, which can apply uniform fine vibration to the entire screen with one motor consuming less power.
本発明の第２の目的はこの方法を実施するためのスク
リーン振動機構を提供することにある。It is a second object of the present invention to provide a screen vibrating mechanism for performing this method.
本発明の上記第１の目的は、全方位へ平面移動可能に
支持させたシート状プラスチツクスクリーンの縁辺近傍
を起動点として該スクリーンに微小径の円軌道の振動を
与えるとともに、該スクリーンの前記起動点から離れた
位置に生起される偏った方向の振動力を別の従動振動子
に作用させて該偏った方向の振動をその偏り方向と異な
る方向の振動に分散もしくは転換させることによって達
成することができる。The first object of the present invention is to provide a vibrating screen having a small diameter orbit with the vicinity of an edge of a sheet-like plastic screen supported so as to be movable in all directions in a plane as a starting point, and to start the screen. Achieved by applying a biased vibration force generated at a position distant from a point to another driven vibrator to disperse or convert the biased direction vibration into a direction different from the biased direction. Can be.
また、本発明の上記第２の目的は、全方位へ平面移動
可能に支持させたシート状スクリーンの縁辺近傍の一
点、モータによって細いワイヤ先端が微小径の円軌道で
回転するようになされた主動振動子の先端を差込係合さ
せるとともに、この係合点から離隔したスクリーン縁辺
近傍位置に、該位置のスクリーンの偏った方向の振動力
により作動し該偏った方向の振動をこれと異なる方向の
振動に分散または転換させる従動振動子を係合させた映
写用プラスチツクスクリーンの振動機構によって達成す
ることができる。Further, the second object of the present invention is to provide a main screen in which a thin wire tip is rotated by a motor at a point near an edge of a sheet-like screen supported so as to be movable in all directions in a plane. The distal end of the vibrator is inserted and engaged, and the vibrating force in the biased direction of the screen at this position is actuated at a position near the screen edge remote from the engagement point, and the vibration in the biased direction is moved in a different direction. This can be achieved by a projection plastic screen vibration mechanism in which a driven vibrator that disperses or converts to vibration is engaged.
従動振動子は、基端をスクリーン外部のフレームに固
定し、先端を特定方向へ優先的に揺動するようになされ
た方向性のあるバネで構成し、該方向性バネの先端を、
該バネの優先揺動方向がスクリーンの前記離隔位置の偏
った振動方向と異なる方向に向くようにしてスクリーン
に差込係合させてもよく、また、従動振動子を、基端を
スクリーン外部のフレームに回転自在に支持させ且つ先
端は微小径の円軌道で回転するようになされた回転子で
構成し、該回転子の先端をスクリーンに差込係合させた
構造でもよい。The driven vibrator has a base end fixed to a frame outside the screen, and is configured with a directional spring made to swing the front end preferentially in a specific direction.
The spring may be inserted and engaged with the screen such that the preferred swing direction of the spring is different from the direction of the biased vibration of the separated position of the screen, and the driven vibrator may have a base end outside the screen. A structure in which the frame is rotatably supported and the tip is constituted by a rotor adapted to rotate in a circular path with a small diameter, and the tip of the rotor may be inserted and engaged with the screen.
尚、主動振動子と従動振動子はスクリーンの相対する
縁辺近傍に係合させる。The driving oscillator and the driven oscillator are engaged with each other near the opposing edges of the screen.
スクリーンは左右上下全方向へ平面移動可能に支持さ
れているので微小円軌道の振動を主動振動子のワイヤ先
端をスクリーンの縁辺近傍に差込係合させて主動振動子
のモータを作動させるとスクリーンには主動振動子の差
込係合部を中心とする円軌道の微小振動が生起される。Since the screen is supported so that it can move horizontally in all directions, up, down, left and right, the vibration of the microcircular orbit is inserted into the vicinity of the edge of the screen by inserting the wire tip of the driving oscillator, and the motor of the driving oscillator is activated. , A minute vibration of a circular orbit centered on the insertion engagement portion of the driving oscillator.
この場合主動振動子の差込係合点はスクリーンの縁辺
近傍であるためこの係合点から離隔した位置のスクリー
ンは係合点のような円軌道の振動とはならず、一定方向
へ偏った振動、例えば主動振動子の係合点がスクリーン
の下部にある場合はこれと対向するスクリーン上部の振
動は縦方向へ偏った振動になる。しかしながら本発明で
はスクリーンの前記偏った方向の振動力の作用を受けて
この偏った方向の振動を別の方向へ分散または転換する
従動振動子が設けられているのでスクリーンの主動振動
子の係合部と従動振動子の係合部は共振し、スクリーン
全体がきわめて近似の振幅で振動する。従って、鮮明度
は画面全体に均質になる。In this case, since the insertion engagement point of the driving oscillator is near the edge of the screen, the screen at a position separated from the engagement point does not vibrate in a circular orbit like the engagement point, but vibrates in a certain direction, for example, When the engaging point of the main vibrator is at the lower part of the screen, the vibration of the upper part of the screen opposed thereto is a vibration which is deviated in the vertical direction. However, in the present invention, there is provided a driven vibrator for dispersing or converting the vibration in the deviated direction to another direction under the action of the vibration force in the deviated direction of the screen. The engaging portion between the portion and the driven vibrator resonates, and the entire screen vibrates at a very similar amplitude. Therefore, the definition becomes uniform over the entire screen.
尚、従動振動子はスクリーンの振動力で受動的に作動
するので振動が干渉することはまったくない。In addition, since the driven vibrator is passively operated by the vibration force of the screen, the vibration does not interfere at all.
以下、本発明の実施例を添付図面に基づいて説明す
る。Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
第１図のように上下、左右全方位へ平面移動可能に支
持させたシート状のプラスチツクスクリーン１の下部1a
に、微小径の円軌道で回動する細いワイヤの主動振動子
を差込み、この回転子をモータで矢印のように高速回転
させると、スクリーンが微振動する。As shown in FIG. 1, a lower portion 1a of a sheet-like plastic screen 1 which is supported so as to be movable in all directions in all directions up and down, left and right.
When a fine wire driven oscillator that rotates in a circular path with a small diameter is inserted into the motor and the rotor is rotated at a high speed by a motor as indicated by an arrow, the screen vibrates slightly.
この場合、主動振動子はスクリーンの下部縁辺に係合
してスクリーンを振動させているため主動振動子から離
たところ1bではスクリーンの振幅があらくなり、また振
動が一方向に偏ったものになる。例えば、主動振動子を
スクリーンの下部に設けた場合、スクリーンの上部縁辺
付近は縦方向に偏向した振動が生起されることが実験に
より確認された。これは図のように当該位置に十字
（＋）の表示Ｄを付して振動させると横軸よりも縦軸が
より鮮明に見えることから容易に知ることができる。In this case, the main vibrator engages with the lower edge of the screen to vibrate the screen, so when the main vibrator is away from the main vibrator, the amplitude of the screen becomes large in 1b and the vibration is biased in one direction. . For example, when the driving vibrator was provided at the lower part of the screen, it was confirmed by an experiment that vibration deflected in the vertical direction occurred near the upper edge of the screen. This can be easily known from the fact that when the position is indicated by a cross (+) D and vibrated as shown in the figure, the vertical axis looks sharper than the horizontal axis.
そこで、本発明の思想はスクリーンの偏向振動のエネ
ルギーを利用して、偏った方向、例えば図のＹ方向の振
動を矢印Ｘのような他の方向へ分散、転換することによ
り、スクリーンを２ケ所の位置で共振させ、スクリーン
全域にできるだけ均質な微振動を与えようとするもので
ある。Therefore, the idea of the present invention is to use the energy of the deflection vibration of the screen to disperse and convert the vibration in a deviated direction, for example, the Y direction in the figure, into another direction as indicated by an arrow X, thereby forming the screen in two places. To resonate at the position described above, and to give as fine a micro vibration as possible over the entire area of the screen.
第２図は本発明によるスクリーン振動機構の一実施例
を示すもので、１は例えば0.1mm以下のシート状プラス
チツクなどの材質からなる半透明の映像スクリーンであ
り、このスクリーン１は映像装置２のフレーム３に押え
片４を用いて上下、左右全方向へ平面移動可能に支持さ
れている。FIG. 2 shows an embodiment of a screen vibrating mechanism according to the present invention, wherein 1 is a translucent video screen made of a material such as a sheet-like plastic of 0.1 mm or less, for example. The frame 3 is supported by a holding piece 4 so as to be movable in a plane in all directions, up and down, left and right.
スクリーン１の下部縁辺の好ましくは中央に、モータ
５によって微小径の円軌道で回動するようになされた主
動振動子６が配設されている。A driving vibrator 6 is provided at the lower edge of the screen 1, preferably at the center thereof, which is rotated by a motor 5 on a circular path of a small diameter.
第２図の実施例の主動振動子６は第３図に示すように
モータ５の軸５′に連結される回転体6aの偏心位置に細
いワイヤ6b突出させた構造なり、ワイヤ6bの先端をスク
リーン１の前記下部縁辺近傍1aに差込んで係合されてい
る。The driving oscillator 6 of the embodiment shown in FIG. 2 has a structure in which a thin wire 6b is projected at an eccentric position of a rotating body 6a connected to a shaft 5 'of the motor 5 as shown in FIG. The screen 1 is inserted into and engaged with the lower edge vicinity 1a of the screen.
この状態でモータ５により主動振動子６を回転作動さ
せるとワイヤ6bの高速円回動による微振動がスクリーン
１に生起される。しかしながら、スクリーン１は主動振
動子６のワイヤ6bを係合させた位置から遠ざかるにつれ
て振幅が大きくなり、また振動方向が偏ってくる。ちな
みに、図のようにスクリーンの下辺に主動振動子６を係
合させて円軌道の微振動を与えた場合にはスクリーン１
上部縁辺近傍1bの振動は縦方向に偏った（縦方向が勝っ
た）振動になる。When the driving oscillator 6 is rotated by the motor 5 in this state, fine vibration is generated on the screen 1 by the high-speed circular rotation of the wire 6b. However, the screen 1 increases in amplitude as the distance from the position where the wire 6b of the driving oscillator 6 is engaged is increased, and the vibration direction is biased. Incidentally, when the driving oscillator 6 is engaged with the lower side of the screen as shown in FIG.
The vibration near the upper edge 1b is a vibration that is deviated in the vertical direction (the vertical direction wins).
このため、本発明のスクリーン振動機構ではスクリー
ン１の前記偏った振動が伝わる位置、（図の実施例では
スクリーン上辺の中央縁辺）に、スクリーン１の振動を
うけて作動し、この偏向振動をこれと異なる方向へ分散
または転換させる従動振動子７を配設してある。Therefore, the screen vibration mechanism of the present invention operates by receiving the vibration of the screen 1 at the position where the above-mentioned biased vibration of the screen 1 is transmitted (in the illustrated embodiment, the center edge of the upper side of the screen). The driven vibrator 7 for dispersing or converting in a direction different from that of FIG.
第２図実施例では従動振動子７として特定方向に撓に
易くした方向性のあるバネ７′が使用されている。In the embodiment shown in FIG. 2, a directional spring 7 ′ which is easily bent in a specific direction is used as the driven vibrator 7.
ここで「方向性のあるバネ」とは外力に対しある所定
の方向に反撥力を以って優先的に撓むように形成された
部材を意味し、例えば、第4a図のようにワイヤ8aの先端
または中間に平坦部8bを形成し、これによりこの平坦面
と直交する方向へ撓み易くした一方向性のもの、あるい
は第4b図のように、ワイヤ8aの先端または中間に相互に
90度位相させた二面の平坦部8b,8b′を形成した二方向
性のものがあり、その他、外力に対して特定方向に優先
的に撓むようにしたものであればいかなる形状でもよ
い。Here, “directional spring” means a member formed to bend preferentially with a repulsive force in a predetermined direction against an external force, for example, as shown in FIG. 4a, the tip of a wire 8a. Alternatively, a flat portion 8b is formed in the middle, thereby making it easy to bend in a direction perpendicular to the flat surface, or as shown in FIG. 4b, mutually at the tip or middle of the wire 8a.
There is a two-way type in which two flat portions 8b and 8b 'that are phased by 90 degrees are formed, and any other shape may be used as long as it bends preferentially in a specific direction against an external force.
このように従動振動子７として方向性のあるバネ７′
を使用する場合は第２図のようにバネ７′の先端をスク
リーン１の前記所定の偏向振動部（図ではスクリーン上
部1b）に直角に差込み係合させてバネ後端をブラケツト
９に固定する。この場合、バネ７′は、防振ゴム10など
を介して固定してもよい。In this way, the driven vibrator 7 has a directional spring 7 '.
2, the tip of the spring 7 'is inserted perpendicularly into and engaged with the predetermined deflecting vibrating portion (the upper portion 1b of the screen in the figure) of the screen 1 to fix the rear end of the spring to the bracket 9 as shown in FIG. . In this case, the spring 7 'may be fixed via an anti-vibration rubber 10 or the like.
第５図実施例は従動振動子７として、主動振動子と同
様に、回転体11aの偏心位置に細いワイヤ11bを突出さ
せ、回転体11aの回転によりワイヤ11b先端が微小径の円
軌道で回動するようにした回転子７″を用い、回転子
７″の回転体をブラケツト９に回転可能に支持させてワ
イヤ11b先端をスクリーン１の前記所定位置1bに直角に
差込み係合させたものである。In the embodiment shown in FIG. 5, a thin wire 11b is protruded from the eccentric position of the rotating body 11a as the driven vibrator 7 in the same manner as the driven vibrator. The rotor 7 "is adapted to move, and the rotating body of the rotor 7" is rotatably supported by the bracket 9, and the tip of the wire 11b is inserted into the predetermined position 1b of the screen 1 at right angles to engage therewith. is there.
第２図の実施例ではスクリーン１の上部は縦方向に偏
った振動がおこるがこの振動力は方向性のあるバネ７′
に作用し、バネ７′の平坦部8b反撥力で斜め方向へ矯正
される。また方向性バネはスクリーンの振動力によって
従動的に振動するのでスクリーン１の相対する位置が干
渉することなく共振する。In the embodiment shown in FIG. 2, the upper portion of the screen 1 vibrates in a vertical direction, but this vibration force is generated by a directional spring 7 '.
And the flat portion 8b of the spring 7 'is corrected obliquely by the repulsive force. In addition, the directional spring is driven to vibrate by the vibrating force of the screen, so that the opposing positions of the screen 1 resonate without interference.
第５図の実施例ではスクリーン１上部付近の縦方向の
偏向振動は微小径の円運動をする回転子により円形振動
に転換される。In the embodiment of FIG. 5, the deflection vibration in the vertical direction near the upper portion of the screen 1 is converted into a circular vibration by a rotor having a small diameter circular motion.
本発明は以上のようにスクリーンの一側に主動振動子
による円運動は微振動を与えるとともに、スクリーンの
反体側に生ずる偏った振動を従動振動子によって分散ま
たは方向転換させるのでスクリーンの全面が一様の振動
になり、映像の鮮明度が著しく向上する。特にスクリー
ンの縁や、角がぼけるといった従来の問題が解消され
る。また、従動振動子はスクリーンの振動力で動かされ
るので主動振動子と干渉することがなく、円滑な振動
（共振）が得られるとともに、主動振動子のモータの消
費電力が少なく、小型のモータで長時間運転することが
できる。According to the present invention, as described above, the circular motion of the main vibrator on one side of the screen gives a minute vibration, and the biased vibration generated on the opposite side of the screen is dispersed or turned by the driven vibrator. And the sharpness of the image is significantly improved. In particular, conventional problems such as blurred edges and corners of the screen are eliminated. In addition, the driven oscillator is moved by the vibrating force of the screen, so that the driven oscillator does not interfere with the driven oscillator, so that a smooth vibration (resonance) can be obtained, and the power consumption of the motor of the driven oscillator is small. You can drive for a long time.
第１図は本発明法の概念を示す説明図、第２図は本発明
によるスクリーン振動機構の一実施例を示す概略的な透
視図、第３図は主動振動子の拡大説図、第4a図，第4b及
び第５図は従動振動子の具体例を示す詳細説明図であ
る。 １……スクリーン、５……モータ、６……主動振動子、
6a……回転子、6b……ワイヤ、７′……方向性バネ、
７″……回転子。FIG. 1 is an explanatory view showing the concept of the method of the present invention, FIG. 2 is a schematic perspective view showing an embodiment of a screen vibrating mechanism according to the present invention, FIG. 3 is an enlarged explanatory view of a driving oscillator, FIG. FIGS. 4b and 5 are detailed explanatory views showing specific examples of the driven vibrator. 1 ... screen, 5 ... motor, 6 ... driving oscillator,
6a ... rotor, 6b ... wire, 7 '... directional spring,
7 "... Rotor.
Claims (5)
チツクスクリーンの縁辺近傍を起動点として該スクリー
ンに微小径の円軌道の振動を与えるとともに、該スクリ
ーンの前記起動点から離れた位置に生起される偏った方
向の振動力を別の従動振動子に作用させて該偏った方向
の振動をその偏り方向と異なる方向の振動に分散もしく
は転換させることを特徴とするプラスチツクシート状映
写用スクリーンの粒子消去方法。1. A vibration of a small diameter circular orbit is given to a plastic screen which is supported near the edge of a plastic screen which is supported so as to be movable in all directions in a plane, and is generated at a position distant from the starting point of the screen. A plastic sheet-like projection screen, characterized in that the vibrating force in the deviated direction is applied to another driven vibrator to disperse or convert the deviated vibration into vibration in a direction different from the deviated direction. Particle elimination method.
状スクリーンの縁辺近傍の一点、モータによって細いワ
イヤ先端が微小径の円軌道で回転するようになされた主
動振動子の先端を差込係合させるとともに、この係合点
から離隔したスクリーン縁辺近傍位置に、該位置のスク
リーンの偏った方向の振動力により作動し、該偏った方
向の振動をこれと異なる方向の振動に分散または転換さ
せる従動振動子を係合させたことを特徴とする映写用プ
ラスチツクスクリーンの振動機構。2. A tip of a main vibrator in which a tip of a thin wire is rotated by a motor in a circular orbit of a small diameter at a point near an edge of a sheet-like screen supported so as to be movable in all directions in a plane. At the same time, the screen is actuated at a position near the screen edge separated from the engagement point by a vibration force in a deviated direction of the screen, and the vibration in the deviated direction is dispersed or converted into vibration in a different direction. A vibration mechanism for a projection plastic screen, wherein a driven vibrator is engaged.
対する縁辺近傍に係合されていることを特徴とする請求
項（２）記載のスクリーン振動機構。3. The screen vibration mechanism according to claim 2, wherein the driving rotor and the driven vibrator are engaged in the vicinity of opposite edges of the screen.
レームに固定し、先端を特定方向へ優先的に揺動するよ
うになされた方向性のあるバネからなり、該方向性バネ
の先端を、該バネの優先揺動方向がスクリーンの前記離
隔位置の偏った振動方向と異なる方向に向くようにして
スクリーンに差込係合させたことを特徴とする請求項
（２）または（３）記載のスクリーン振動機構。4. The driven vibrator comprises a directional spring having a proximal end fixed to a frame outside the screen and a distal end swinging preferentially in a specific direction. The plug is engaged with the screen such that the priority swing direction of the spring is different from the direction of the biased vibration of the screen at the separated position. Screen vibration mechanism as described.
レームに回転自在に支持させ且つ先端が微小径の円軌道
で回転するようになされた回転子からなり、該回転子の
先端をスクリーンに差込係合させたことを特徴とする請
求項（２）または（３）記載のスクリーン振動機構。5. A driven vibrator comprising a rotor having a base end rotatably supported by a frame outside the screen and a front end rotatable in a circular orbit having a small diameter. The screen vibration mechanism according to claim 2 or 3, wherein the screen vibration mechanism is inserted into the screen vibration mechanism.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63151808A JP2721972B2 (en) | 1988-06-20 | 1988-06-20 | Particle elimination method of plastic screen for projection and screen vibration mechanism therefor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP63151808A JP2721972B2 (en) | 1988-06-20 | 1988-06-20 | Particle elimination method of plastic screen for projection and screen vibration mechanism therefor |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01319026A JPH01319026A (en) | 1989-12-25 |
| JP2721972B2 true JP2721972B2 (en) | 1998-03-04 |
Family
ID=15526760
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP63151808A Expired - Lifetime JP2721972B2 (en) | 1988-06-20 | 1988-06-20 | Particle elimination method of plastic screen for projection and screen vibration mechanism therefor |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2721972B2 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4193899B2 (en) | 2006-04-05 | 2008-12-10 | 三菱電機株式会社 | Projection-type image display device |
| US7660037B2 (en) | 2006-06-06 | 2010-02-09 | Seiko Epson Corporation | Screen, projector, and image display device |
| JP4467598B2 (en) | 2007-04-12 | 2010-05-26 | 三菱電機株式会社 | Projection-type image display device |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS495256A (en) * | 1972-04-28 | 1974-01-17 | ||
| JPS5974541A (en) * | 1982-10-20 | 1984-04-27 | Yuupu:Kk | System for projection to projection screen and projection screen |
-
1988
- 1988-06-20 JP JP63151808A patent/JP2721972B2/en not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01319026A (en) | 1989-12-25 |
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