Title:
ILLUMINATION OPTICAL SYSTEM AND PROJECTION TYPE DISPLAY DEVICE USING IT
Document Type and Number:
Japanese Patent JP3684926
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To enhance the utilizing efficiency of the light of an illumination optical system.
SOLUTION: This illumination optical system is provided with a light source, a splitting optical system splitting the light emitted from the light source into plural partial light fluxes and a superimposing optical system superimposing the plural partial light fluxes emitted from the splitting optical system in an illumination area. The splitting optical system is provided with a 1st lens array having plural small lenses splitting the light emitted from the light source into the plural partial light fluxes and a 2nd lens array having plural small lenses corresponding to the plural small lenses of the 1st lens array respectively. The 2nd lens array is arranged near a position where the plural partial light fluxes emitted from the 1st lens array are condensed. Then, the plural small lenses of the 2nd lens array are formed to be polygonal other than almost rectangular according to the contour shape of the partial light fluxes condensed by the plural corresponding small lenses of the 1st lens array.
Inventors:
Kyori Ogawa
Application Number:
JP21334799A
Publication Date:
August 17, 2005
Filing Date:
July 28, 1999
Export Citation:
Assignee:
Seiko Epson Corporation
International Classes:
G02B19/00; G03B21/14; (IPC1-7): G03B21/14; G02B19/00
Domestic Patent References:
| JP10221690A | ||||
| JP10288757A | ||||
| JP2001033749A |
Foreign References:
| WO1999028780A1 | ||||
| US5662401 |
Attorney, Agent or Firm:
Takao Igarashi
Takashi Shimoide
Hiroshi Ichikawa
Mitsuhiro Kato
Takashi Shimoide
Hiroshi Ichikawa
Mitsuhiro Kato