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:
Aug. 17, 2010
Filed:
Nov. 29, 2007
Takehiko Sato, Utsunomiya, JP;
Takehiko Sato, Utsunomiya, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A lens barrel with improved precision is obtained by reducing fitting play of a lens barrel. A coil and a magnetic member are fixed on a lens holding member, and a magnet and a yoke are fixed on an outer barrel. When energizing the coil, the lens holding member moves in the optical axis direction along guide bars by magnetic fluxes from the magnet. The magnetic member receives a magnetic attraction force toward the magnet by leakage fluxes. In the lens holding member, a bearing sleeve is biased by the attraction force perpendicularly to the axis of the guide bar, and the resultant force of the attraction force and a gravitational force exerted on the lens holding member removes play. A resultant force of a force toward the guide bar exerted on the bearing and the gravitational force thereon removes fitting play between the bearing and the guide bar.