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:
Jun. 23, 2009
Filed:
Dec. 20, 2007
Chifuyu Tomita, Yokohama, JP;
Hiroyoshi Inaba, Utsunomiya, JP;
Youichi Iwasaki, Utsunomiya, JP;
Tomoki Hasegawa, Utsunomiya, JP;
Chifuyu Tomita, Yokohama, JP;
Hiroyoshi Inaba, Utsunomiya, JP;
Youichi Iwasaki, Utsunomiya, JP;
Tomoki Hasegawa, Utsunomiya, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A lens barrel includes: first and second movable lens units; first and second drive sources for moving the first and second movable lens units in a direction parallel to an optical axis, respectively; guide members for each retaining the first and second movable lens units and for guiding movements of the first and second movable lens units; and a reference position detector for detecting reference positions for the first and second movable lens units, in which: the reference position detector has light emitting receiving elements; the first and second movable lens units have sleeves each engaged with the guide members and have light blocking portions for detecting the reference positions by the light emitting and receiving elements of the reference position detector; and the first and second lens units can move in the optical axis direction, with their respective light blocking portions passing each other without any interference.