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. 05, 1985
Filed:
Jul. 10, 1981
Applicant:
Inventor:
Takashi Maruyama, Suwa, JP;
Assignee:
Chinon Kabushiki Kaisha, Nagano, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
G03B / ;
U.S. Cl.
CPC ...
354402 ; 352140 ;
Abstract
An automatic focusing device for a cine camera operates so that the speed at which the lens is moved to its optimum focusing position decreases as a perfect focus is reached. A comparator determines how far out of focus the system is, and a pulse width modulator provides a zero to 100% energization signal to the servo control circuit. The farther the system is out of focus, the larger percentage energization signal from the pulse width modulator and the faster the lens will be moved toward the optimum position.
Quick Actions:
Maruyama, Takashi. (1985). Focusing control device (U.S. Patent No. 4550994). U.S. Patent and Trademark Office. https://idiyas.com/patent/badge/4550994
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile