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:
Nov. 26, 2002
Filed:
Aug. 28, 2001
Norio Numako, Tochigi, JP;
Naoto Nakahara, Saitama, JP;
Asahi Kogaku Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
A lens drive control apparatus includes a movable lens which is movable along the optical axis; a lens driver; a code plate having two limit positions respectively serving as mechanical movement limit positions of the movable lens, the code plate including first and second codes; a code detector which moves together with the movable lens; a pulse generator which generates pulses according to the movement of the movable lens; a pulse counter; and a position determining device which determines an absolute position of the first code detected by the code detector, based on the number of pulses counted by the pulse counter from the time when the code detector detects the first or second code until the time when the code detector detects the subsequent other of the second code or first code.