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, 1992
Filed:
Apr. 25, 1990
Hiroyuki Hagiwara, Tokyo, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A lens actuator capable of driving a lens smoothly in two-directions and which is small in size and light in weight is disclosed. The lens actuator include a base having a supporting shaft, a lens holder set so as to be rotatable about and slidable along the supporting shaft, a lens retained by the holder so that an optical axis thereof is parallel with the supporting shaft and the lens is mounted on the holder at a position separate from the supporting shaft, a first coil mounted on the holder for generating a force for rotating the holder by flowing a current therein, a second coil mounted on the holder for generating a force for slidably moving the holder along the supporting shaft by flowing a current therein and a magnet mounted on the base for applying a magnet field to the first and second coils. The first coil is mounted on the holder on the side opposed to the lens with the supporting shaft between. The first coil balances the weight of the lens so that the center of gravity of the holder is substantially at the center of rotation thereof.