Title:
IMAGE FORMATION OPTICAL SYSTEM
Document Type and Number:
Japanese Patent JPH05107501
Kind Code:
A
Abstract:
PURPOSE:To provide an image formation optical system which uses a light valve as an image display device and can project an image having good picture quality by using a dichroic mirror. CONSTITUTION:The dichroic mirror M1 is composed of two equal-thickness parallel plane plates which are joined together on their surfaces where light splitting films are formed and a cylindrical lens S is installed between an image forming lens L and the dichroic mirror M1. Astigmatism generated when light is transmitted through the dichroic mirror M1 is compensated by only the single cylindrical lens S and eliminated and thickness which is large enough to hold the surface precision of a light splitter excellent can be secured.
Inventors:
AONO YASUHIRO
Application Number:
JP8734091A
Publication Date:
April 30, 1993
Filing Date:
March 28, 1991
Export Citation:
Assignee:
NIKON CORP
International Classes:
G02B27/10; G02B27/18; G02F1/13; G02F1/1347; G03B33/12; (IPC1-7): G02B27/10; G02B27/18; G02F1/13; G02F1/1347; G03B33/12
Domestic Patent References:
| JPS6068333A | 1985-04-18 | |||
| JPS63316328A | 1988-12-23 | |||
| JPS5335554A | 1978-04-03 |
Attorney, Agent or Firm:
Takeo Ichimura