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:
Mar. 26, 1991
Filed:
Aug. 17, 1988
Applicant:
Inventors:
Toshio Murakami, Yokohama, JP;
Takashi Azumi, Yokohama, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H04N / ;
U.S. Cl.
CPC ...
358227 ; 2502011 ;
Abstract
An electronically-controlled focusing adjustment apparatus including manual focusing adjustment means using a manual focusing adjsutment device such as a variable resistor, focusing lens position detection means, and feedback means for comparing a voltage outputted from a movable terminal of the manual focusing adjustment device with a voltage outputted from the focusing lens position detection means and for feeding back the error between the two voltages to a motor for driving the focusing lens. Desired manual focusing is thus attained with respect to an object located at an arbitrary distance.