Title:
ILLUMINATION OPTICAL SYSTEM AND PROJECTOR
Document Type and Number:
WIPO Patent Application WO/2017/002685
Kind Code:
A1
Abstract:
This illumination optical system is provided with a lens group, a diaphragm, and a prism unit. The prism unit includes first to third prisms and a rotationally-asymmetrical curved reflective surface having a positive power. The curved reflective surface satisfies the following conditional expression: PYa/PZa < PYb/PZb.
(In this formula, Pya and Pyb represent the powers of the curved reflective surface at the positions of a point a and a point b within the reference plane, and PZa and PZb represent the powers of the curved reflective surface at the positions of the point a and the point b within a plane including a normal line to the reference plane and a normal line to the curved reflective surface, the point a representing where the principal ray of a beam, which illuminates the area nearest to the lens group, impinges on the curved reflective surface and the point b representing where the principal ray of a beam, which illuminates the area farthest from the lens group, impinges on the curved reflective surface along an intersecting line between an image display surface and a reference plane defined as the plane formed by the ray passing through the center of the lens group and the diaphragm in the prism unit.)
Inventors:
IMAOKA MASAYUKI (JP)
SAWAI YASUMASA (JP)
SAWAI YASUMASA (JP)
Application Number:
PCT/JP2016/068542
Publication Date:
January 05, 2017
Filing Date:
June 22, 2016
Export Citation:
Assignee:
KONICA MINOLTA INC (JP)
International Classes:
G03B21/14; G02B17/08; G02B19/00; G02B27/09; G03B21/00
Foreign References:
| JP2012098366A | 2012-05-24 | |||
| JP2012247778A | 2012-12-13 |
Attorney, Agent or Firm:
SANO PATENT OFFICE (JP)
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