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:
Jan. 26, 1993
Filed:
May. 06, 1991
Akihiko Miyazaki, Tokyo, JP;
U.S. Philips Corporation, New York, NY (US);
Abstract
An automatic focus control device capable of obtaining an accurate in-focus state of a subject having less high-frequency components is provided. A luminance signal of the video signal of the subject is first differentiated by a combination of a delay circuit (27) and a difference forming circuit (26). The differentiated luminance signals are accumulated by an accumulator (31), and a clock pulses CL are counted by a counter (32) during the periods when the differentiated luminance signals exceed a predetermined value. The accumulated value is then divided by the clock count at a divider (33) to obain a focus control signal which is fed to a microcomputer (35). The microcomputer causes a lens (11) to move in accordance with this focus control signal so that an optimum in-focus state of the subject is obtained.
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile