Optics: image projectors – Cabinet encloses projector and one side of screen – Reflector between lamp and screen
Reexamination Certificate
2005-10-26
2008-12-23
Nguyen, Hung Henry (Department: 2851)
Optics: image projectors
Cabinet encloses projector and one side of screen
Reflector between lamp and screen
C353S078000
Reexamination Certificate
active
07467872
ABSTRACT:
In the image display device, a projection lens including a plurality of lenses for enlarging an image from an image display element is constituted of a front group and a rear group. The rear group includes at least one free-shaped-surface lens including a surface having a rotationally asymmetrical shape. Furthermore, the device includes at least one free-shaped-surface mirror having a rotationally asymmetrical reflection surface. Accordingly, a set can be formed to be compact while correcting trapezoidal distortion and aberration.
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Chinese Office Action with English Translation, issued in Chinese Patent Application No. CN 200510127941.2, dated on Mar. 30, 2007.
U.S. Appl. No. 11/280,821, filed Nov. 17, 2005.
Jan. 14, 2008 Office Action from U.S. Appl. No. 11/280,821.
Hirata Koji
Hisada Takanori
Ohishi Tetsu
Yatsu Masahiko
Yoshikawa Hiroki
Hitachi , Ltd.
McDermott Will & Emery LLP
Nguyen Hung Henry
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