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, 2004
Filed:
Feb. 20, 2003
Yasuhiro Toyoda, Saitama, JP;
Canon Kabushiki Kaisha, Tokyo, JP;
Abstract
A shutter device of the invention includes: a shutter base plate having a shutter opening; a first arm member which rotates with a first shaft as a rotation center relative to the shutter base plate; a second arm member which rotates with a second shaft as a rotation center relative to the shutter base plate; and plural shutter blades, wherein each of the plural shutter blades is joined to the first and second arm members and when the first and second arm members rotate with respect to each shaft, the plural shutter blades travel over the shutter opening in a predetermined direction, and in a state in which the plural shutter blades are positioned in their overlapping state, when an angle formed between a line connecting the rotation center of the first arm with a connecting center to the first arm member of a shutter blade, located on a front end side (opposite side to the first rotation center) of the first arm member and a direction perpendicular to the predetermined direction is assumed to be &agr;, a condition of 45°≦&agr;≦50° is satisfied. Consequently, the size of the shutter device in a direction perpendicular to the traveling direction of the shutter can be reduced.