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. 22, 2004
Filed:
Feb. 24, 2003
Akihisa Horiuchi, Tokyo, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
This specification discloses a zoom lens of novel construction in which ghost or flare caused by the reflection between a filter member and an image pickup surface suppressed. This zoom lens is provided, in succession from the front to the rear, with a first lens unit of positive power, a second lens unit of negative power moved during zooming, a stop unit, a third lens unit of positive power, and a fourth lens unit of positive power moved during zooming. The stop unit has a stop blade forming an aperture, and a filter member for attenuating the quantity of light passing through the aperture. The filter member is so disposed as to be inclined with respect to the optical axis of the zoom lens.