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:
Jul. 29, 2003
Filed:
May. 30, 2002
Kazuhiro Ichinokawa, Saitama, JP;
Pentax Corporation, Tokyo, JP;
Abstract
A lens drive system includes a lens case supporting an image pick-up device; a movable lens frame supporting a lens group; a reversible motor supported by the lens case; a feed screw supported by the lens case and driven by the reversible motor; a half nut which moves together with the movable lens frame, is normally engaged with the feed screw, and is disengaged from the feed screw to slide thereon when more than a predetermined force is applied to the half nut in optical axis direction; and a plurality of ribs formed in the lens case projecting inwards behind a space for movement of the movable lens frame. Each rib includes a stop surface which comes into contact with a rear surface of the movable lens frame when the movable lens frame retreats while the half nut is sliding on the feed screw.