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. 06, 1990
Filed:
May. 19, 1989
Isao Hijikata, Yokohama, JP;
Toshiharu Hida, Tokyo, JP;
Victor Company of Japan, Ltd., Yokohama, JP;
Abstract
There is disclosed herein an automatic focusing system including an optical system having a focus lens, a zoom lens and an image pickup device for converting a light beam from an object into a corresponding electrical signal. The automatic focusing system comprising a filter for deriving a predetermined component of the electrical signal, a detector for detecting a focus voltage of the predetermined component and a drive circuit for moving the focus lens and zoom lens in the directions of the optical axis of the optical system. Also included in the focusing system is a control unit which moves the focus lens through the drive circuit to bring the focus lens into the fous positon and, when the focus position is not taken in a predetermiend movable range, moves the zoom lens toward the wide-angle side before again moving the focus lens so as to take the focus position.