Title:
PROJECTION OPTICAL SYSTEM AND PROJECTION IMAGE DISPLAY APPARATUS
Document Type and Number:
WIPO Patent Application WO/2013/080953
Kind Code:
A1
Abstract:
A projection image display apparatus is equipped with a display device (3) and a projection optical system (100). The projection optical system (100) has a first lens group (1) having a positive power as a whole, and a second lens group (2) having a negative power as a whole. The second lens group (2) has a first lens (21) and a second lens (22), in that order from the display-device side, each having a negative power. Using the position of the first lens (21) and the second lens (22) in the direction of the optical axis when an image plane is flat as a reference, as the first lens (21) moves closer to the display device (3), and/or the second lens (22) moves away from the display device (3), the focal position of the peripheral light moves closer to the projection optical system (100) in the direction of the optical axis than the focal position of the on-axis light, and the image plane becomes concave with respect to the projection-optical-system side. Furthermore, as the first lens (21) moves away from the display device (3), and/or the second lens (22) moves closer to the display device (3), the focal position of the on-axis light moves closer to the projection optical system (100) in the direction of the optical axis than the focal position of the peripheral light, and the image plane becomes convex with respect to the projection-optical-system side. Thus, the curvature of the image plane formed by the projection optical system (100) is changed.
Inventors:
KUWATA MUNEHARU (JP)
Application Number:
PCT/JP2012/080573
Publication Date:
June 06, 2013
Filing Date:
November 27, 2012
Export Citation:
Assignee:
MITSUBISHI ELECTRIC CORP (JP)
KUWATA MUNEHARU (JP)
KUWATA MUNEHARU (JP)
International Classes:
G02B13/18; G02B13/00; G02B19/00; G03B21/14
Foreign References:
| JPH03196009A | 1991-08-27 | |||
| JPH0682689A | 1994-03-25 | |||
| JPH11142731A | 1999-05-28 | |||
| JP2007041607A | 2007-02-15 | |||
| JP2004354405A | 2004-12-16 | |||
| JP2007114397A | 2007-05-10 | |||
| JP2009036884A | 2009-02-19 | |||
| JP2011107238A | 2011-06-02 | |||
| JPH0763987A | 1995-03-10 | |||
| JP2009014905A | 2009-01-22 | |||
| JPS62148914A | 1987-07-02 |
Attorney, Agent or Firm:
MAEDA Minoru et al. (JP)
Minoru Maeda (JP)
Minoru Maeda (JP)
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Claims: