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:
Sep. 15, 1992
Filed:
May. 23, 1991
Takao Umetsu, Saitama, JP;
Shunji Nishimura, Saitama, JP;
Fuji Photo Film Co., Ltd., Kanagawa, JP;
Abstract
A zoom lens is zoomed selectively in either of two opposite directions by a motor which is rotated by a driver. First and second zoom switches cause the zoom lens to move at a higher speed. Third and fourth zoom switches cause the zoom lens to move at a lower speed for precisely stopping the zoom lens. A CPU connected to the four switches controls a zoom motor to rotate selectively at higher and lower speeds. The first and third zoom switches cause the zoom lens to move in the direction of telephotography, while the second and fourth zoom switches cause the zoom lens to move in the direction of wide-angle photography. In order to keep the speed of the zoom lens unchanged despite the difference in its direction, an electric current of a larger electric power is applied to the motor for rotation in the direction that requires more work.