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:
Mar. 05, 1991
Filed:
May. 31, 1989
Haruhiro Hyodo, Osaka, JP;
Minolta Camera Kabushiki Kaisha, Osaka, JP;
Abstract
A mechanism for curvedly moving a projection lens assembly accommodated in a lens barrel to alter projecting magnification of a projecting optical system is comprised of a support member for supporting a lens barrel accommodating a projection lens assembly, a movable member for holding thereon the support member so that the support member is movable in a first direction, the movable member being movable in a second direction, a guide member in the form of a plate fixedly mounted below the movable member for restricting the position of the support member in the first direction and for guiding the movable member in the second direction, and a drive unit for moving the movable member to an appropriate location corresponding to an altered projecting magnification. The drive unit includes a plurality of pulleys, an endless wire passed about these pulleys and a stepping motor coupled with one of the pulleys.