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. 16, 1999
Filed:
Sep. 09, 1997
Shinya Yajima, Omiya, JP;
Fuji Photo Optical Co., Ltd., Omiya, JP;
Abstract
A signal determining circuit determines the voltage of a control signal which is output according to a rotational angle of a thumb ring. When the determined voltage of the control signal is lower than a predetermined cutoff voltage, an armature of a switch means is made to contact a point of contact which is grounded, so that the control signal can be interrupted. On the other hand, when the determined voltage of the control signal is higher than the cutoff voltage, the armature of the switch means is made to contact the other point of contact so as to input the control signal to a driving circuit, and a servo motor is driven according to the control signal, so that a zoom lens can be moved to the tele side or the wide side. Thereby, it is possible to prevent the lens from operating incorrectly and to effectively eliminate an unstable area in a circuit which has a wide dynamic range.