Title:
【発明の名称】オーバーヘッドプロジェクタ
Document Type and Number:
Japanese Patent JP2751697
Kind Code:
B2
Abstract:
PURPOSE:To improve the contrast ratio, the resolution, the brightness and the facilitation of a projection image with respect to the various kinds of objects such as a plain-paper original, a transmitted original, a book or a stereoscopic substance in an overhead projector using a space light modulation element. CONSTITUTION:Light reflected on the original 16 is made incident on the space light modulation element 26 provided with a dielectric mirror whose band is restricted and liquid crystal which is homeotropic-oriented by the actions of a mirror 22 and an optical system 24. Then, the image information thereof is written. Besides, read-out light whose band is restricted is made incident on the element 26 by the actions of a light source for read-out 30, a band restricting filter 32, an optical system 34 and a polarizing beam splitter 28 and excellently reflected on the dielectric mirror. Then, the image information is read out.
Inventors:
KONNO TOSHIO
NAKAGAKI SHINTARO
NEGISHI ICHIRO
SUZUKI TETSUJI
TATSUMI FUJIKO
TAKAHASHI RYUSAKU
NAKAGAKI SHINTARO
NEGISHI ICHIRO
SUZUKI TETSUJI
TATSUMI FUJIKO
TAKAHASHI RYUSAKU
Application Number:
JP32376191A
Publication Date:
May 18, 1998
Filing Date:
November 12, 1991
Export Citation:
Assignee:
NIPPON BIKUTAA KK
International Classes:
G02F1/13; G02F1/135; G03B21/132; H04N9/31; (IPC1-7): G02F1/13; G02F1/135; G03B21/132
Domestic Patent References:
| JP317615A | ||||
| JP318815A | ||||
| JP383021A | ||||
| JP247072A | ||||
| JP6130167A | ||||
| JP61210338A | ||||
| JP185723U | ||||
| JP5989337U |
Attorney, Agent or Firm:
Kajiwara Yasunori