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:
Apr. 26, 1988
Filed:
Apr. 21, 1986
Keizo Kono, Tokyo, JP;
Tameaki Ebihara, Yamato, JP;
Syohei Kawai, Sagamihara, JP;
Yasukazu Tanabe, Inagi, JP;
Hiroshi Yoshinari, Yamato, JP;
Abstract
A zoom lens apparatus comprises sensors for detecting relative positions of a variable power lens group and a compensating lens group, a memory for pre-storing compensating data peculiar to the zoom lens apparatus, a control circuit and driving parts for moving the variable power lens group and the compensating lens group. The control circuit compares position data set by a variable power setting operation and position data obtained from the sensors and outputs signals for controlling the relative positions of the variable power lens group and the compensating lens group based on the compensating data read out from the memory. The driving parts vary the relative positions of the variable power lens group and the compensating lens group responsive to the output signals of the control circuit.