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:
Aug. 03, 2010
Filed:
Apr. 04, 2007
Hisashi Kawamoto, Narashino, JP;
Hisashi Kawamoto, Narashino, JP;
Seiko Precision, Inc., Chiba, JP;
Abstract
A lens drive device capable of preventing a lens holder from inclining with respect to the optical axis direction of a lens is provided. A first gear (), a second gear (), a protrusion (), and a coil spring () are coaxially supported by a shaft (), which is a fixed shaft. The rotational motion is transmitted to a two-stage gear () by rotating a rotor () of a step motor () clockwise or counterclockwise. The rotational motion of the two-stage gear () is in turn transmitted to the first gear () and the second gear (). When the first gear () and the second gear () rotate, the degree of engagement between an internally threaded portion () of the first gear () and an externally threaded portion () of the second gear () increases, and the second gear () moves upward. As the second gear () moves upward, a lens holder (), urged upward by the elastic force of the coil spring (), moves upward along the optical axis of a lens ().