投写光学系および投写型画像表示装置

Japanese Patent JP5615449

B2

A projection-type image display apparatus includes a display device and a projection optical system. The projection optical system includes a first lens group having a positive power as a whole, and a second lens group having a negative power as a whole. The second lens group includes a first lens and a second lens in an order from the display device side, both of which have negative powers. When the first lens is moved toward the display device and the second lens is moved away from the display device with reference to positions of the first lens and the second lens in a direction of an optical axis when an image surface is planar, a focal position of the peripheral light becomes closer to the projection optical system in the direction of the optical axis than a focal position of the on-axis light, and the image surface is made concave to the projection optical system side. Further, when the first lens is moved away from the display device and the second lens is moved toward the display device, the focal position of the on-axis light becomes closer to the projection optical system in the direction of the optical axis than the focal position of the peripheral light, and the image surface is made convex to the projection optical system side. In this way, a curvature of the image surface formed by the projection optical system is changed.

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JP2011186297	IMAGING LENS
WO/2020/162094	WIDE-ANGLE LENS

桑田 宗晴

JP2013547155A

October 29, 2014

November 27, 2012

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三菱電機株式会社

G02B13/04; G02B13/18; G03B21/10; G03B21/14

JPH03196009A	1991-08-27
JP2007017813A	2007-01-25
JP2009036884A	2009-02-19
JP2011107238A	2011-06-02
JP2010278840A	2010-12-09
JP2006005534A	2006-01-05

Minoru Maeda
Yoichi Yamagata
Masahiko Shinohara

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