The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Apr. 19, 2005
Filed:
Dec. 11, 2003
Kohtaro Hayashi, Toyonaka, JP;
Kohtaro Hayashi, Toyonaka, JP;
Konica Minolta Opto, Inc., Hachioji, JP;
Abstract
In a projection optical system projecting an image displayed on a predetermined play surface onto a predetermined projection surface, two decentering lens units movable in directions vertical to the optical axis and substantially vertical to each other are included between a rear lens unit situated on the display surface side and a front lens unit situated on the projection surface side, a driving mechanism is provided that reciprocates the two decentering lens units in the directions vertical to the optical axis. When the focal lengths of the two decentering lens units are FDand FD, respectively, and the focal length of the rear lens unit is FR, the relationships 0.01≦|FR/FD|≦0.2 and 0.01≦|FR/FD|≦0.2 are satisfied.