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Title:
An optical system for projecting and an image display device
Document Type and Number:
Japanese Patent JP6221266
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To provide a compact projection optical system which requires less projection space and projection distance and is capable of supporting a plurality of image sizes.SOLUTION: A projection optical system comprises a dioptric system, a first mirror, and a second mirror. A long-side direction of an image displayed on an image display element is defined as an X-direction and a short-side direction of the image displayed on the image display element is defined as a Y-direction, while a direction perpendicular to the X and Y directions is defined as a Z-direction. The dioptric system comprises a plurality of lens groups, has positive refractive power in total, and is designed such that some or all of the plurality of lens groups move in the Z-direction when adjusting focus. The first mirror has a convex XZ cross-section in the X and Z directions and is a free-form surface mirror which is stationary when adjusting focus. The second mirror is a concave mirror which is stationary when adjusting focus.

Inventors:
Hibiki Tatsuno
Application Number:
JP2013042171A
Publication Date:
November 01, 2017
Filing Date:
March 04, 2013
Export Citation:
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Assignee:
株式会社リコー
International Classes:
G02B17/08; G02B19/00; G03B21/00; G03B21/14
Domestic Patent References:
JP2008242028A
JP2006330353A
JP2001264627A
Attorney, Agent or Firm:
Yoshiyuki Ishibashi