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Title:
PROJECTION OPTICAL SYSTEM AND IMAGE DISPLAY DEVICE
Document Type and Number:
WIPO Patent Application WO/2019/151252
Kind Code:
A1
Abstract:
The present invention addresses the problem of implementing a novel refractive/reflective-type projection optical system. This projection optical system is for carrying out enlarged projection, on a projection target surface, of an image displayed on an image display surface of an image display element, the image serving as a projection image. A refractive optical system and a refractive and reflective optical element are disposed in sequential order from the image display surface side toward the projection target surface side. The refractive optical system is formed of a plurality of lenses. The refractive/reflective optical element is configured as a single optical element that has a reflective surface and a refraction medium which is in close contact with the reflective surface on an entrance side of the reflective surface. An entrance surface and an exit surface are formed on the refraction medium. The reflective surface is a curved surface that has refractive power. The entrance surface and/or the exit surface has refractive power. An image-forming light flux that has exited from the refractive optical system is made incident on the refractive/reflective optical element from the entrance surface of the refraction medium, reflected by the reflective surface, and made to exit from the exit surface of the refraction medium, thus forming an image as an enlarged image on the projection target surface.

Inventors:
ISHIGAME Takayuki (2-3 Shin-Yokohama 3-chome, Kohoku-ku, Yokohama-sh, Kanagawa 30, 〒2228530, JP)
Application Number:
JP2019/002973
Publication Date:
August 08, 2019
Filing Date:
January 29, 2019
Export Citation:
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Assignee:
RICOH INDUSTRIAL SOLUTIONS INC. (2-3 Shin-Yokohama 3-chome, Kohoku-ku Yokohama-sh, Kanagawa 30, 〒2228530, JP)
International Classes:
G02B17/08; G02B13/16; G02B13/18; G03B21/14
Foreign References:
JP2015108797A2015-06-11
JP2005292813A2005-10-20
JP2007328232A2007-12-20
JP2006058354A2006-03-02
CN104570288A2015-04-29
JP2002118058A2002-04-19
JP2004170877A2004-06-17
Attorney, Agent or Firm:
KUDO Shuichi et al. (2F 23-5 Uehara 3-chome, Shibuya-ku Tokyo, 64, 〒1510064, JP)
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