Optical: systems and elements – Lens – With field curvature shaping
Reexamination Certificate
2011-06-14
2011-06-14
Schwartz, Jordan M. (Department: 2873)
Optical: systems and elements
Lens
With field curvature shaping
C359S727000, C359S733000
Reexamination Certificate
active
07961400
ABSTRACT:
A projection image display device is disclosed in which a trapezoidal distortion and/or aberration are restrained when an image is enlarged and projected obliquely onto a screen. An image generator is connected to an optical system base in such a manner that at least an inclination thereof (on an axis parallel to X axis) with respect to a vertical line and a distance thereof in forward and backward direction (Z axis direction) can be adjusted by an adjusting mechanism. Further, a projecting lens2as a first optical system and a free-form curved surface mirror as a second optical system are fixed to the optical system base. The free-form curved surface mirror is rotatable (on an rotary axis parallel to X axis) with respect to the vertical line at a substantial center of the free-form curved surface mirror.
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Chinese Office Action with English translation, issued in Chinese Patent Application No. 200510127941.2, Dated on Mar. 30, 2007.
Hirata Koji
Hisada Takanori
Ogura Naoyuki
Ohishi Tetsu
Yoshikawa Hiroki
Hitachi , Ltd.
McDermott Will & Emery LLP
Schwartz Jordan M.
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