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. 11, 2015
Filed:
Jun. 20, 2013
Pentax Ricoh Imaging Company, Ltd., Tokyo, JP;
Masakazu Terauchi, Tochigi, JP;
RICOH IMAGING COMPANY, LTD., Tokyo, JP;
Abstract
An autofocus device is provided that includes a lens drive system, an imager, a contrast detector, first and second peak detectors, and a backlash detector. The lens drive system translates a lens. The imager captures an image through the lens. The contrast detector detects the contrast of an image captured by the imager. The first peak detector detects a first contrast peak of images captured at different lens positions when the lens is translated in a forward direction. The second peak detector detects a second contrast peak of images captured at different lens positions when the lens is translated in a backward direction. The detection of the second peak is carried out after detection of the first contrast peak. The backlash detector detects the backlash in the lens drive system according to the positions of the first and second contrast peaks.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile