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:
May. 05, 1998
Filed:
Jan. 09, 1997
Yasushi Tabata, Tokyo, JP;
Norio Numako, Tokyo, JP;
Yoshinari Tanimura, Tokyo, JP;
Takuma Sato, Tokyo, JP;
Masaaki Kishimoto, Tokyo, JP;
Hiroshi Nomura, Tokyo, JP;
Kazuyoshi Azegami, Tokyo, JP;
Takamitsu Sasaki, Tokyo, JP;
Asahi Kogaku Kogyo Kabushiki Kaisha, Tokyo, JP;
Abstract
A control method of a zoom lens camera comprising a lens system having a movable front lens group and a movable rear lens group, a first motor for moving the front lens group, a second motor for moving the rear lens group, a first pulse encoder which is adapted to control the angular position of the first motor and a second pulse encoder which is adapted to control the angular position of the second motor. In such a zoom lens camera. the difference in the image plane position between the wide-angle position and the telephoto position is measured to obtain the necessary number of drive pulses for the motors, so that the zoom adjustment and the fB adjustment can be carried out without need of a mechanical zoom adjustment or a mechanical fB adjustment.