Title:
A lighting installation and a projector
Document Type and Number:
Japanese Patent JP6160144
Kind Code:
B2
Abstract:
A illumination device includes a light source, a diffractive optical element on which light emitted from the light source is made incident, and a superimposing optical system on which diffracted light emitted from the diffractive optical element is made incident. A direction of a principal ray in the center of the diffracted light coincides with an optical axis of the superimposing optical system. Consequently, it is possible to reduce an aberration due to the superimposing optical system and to emit illumination light having a more uniform illuminance distribution.
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Inventors:
Koichi Akiyama
Akihiro Kashiwagi
Akihiro Kashiwagi
Application Number:
JP2013053728A
Publication Date:
July 12, 2017
Filing Date:
March 15, 2013
Export Citation:
Assignee:
Seiko Epson Corporation
International Classes:
G03B21/14; F21S2/00; G02B5/04; G02B5/32; G02B19/00; G03B21/00
Domestic Patent References:
| JP2009162984A | ||||
| JP2004525390A | ||||
| JP2012255982A | ||||
| JP2010217291A | ||||
| JP2008065137A | ||||
| JP2013044800A | ||||
| JP2009168882A | ||||
| JP2004252253A | ||||
| JP2007058148A |
Attorney, Agent or Firm:
Masatake Shiga
Yoshifumi Saeki
Kazunori Onami
Masayu Horiuchi
Yoshifumi Saeki
Kazunori Onami
Masayu Horiuchi
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