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:
Dec. 12, 2006
Filed:
Apr. 20, 2004
Shuji Ichinose, Koriyama, JP;
Yutaka Okazaki, Koriyama, JP;
Takao Ogawa, Koriyama, JP;
Nidec Copal Corporation, Tokyo, JP;
Abstract
A focal plane shutter has a light shielding shutter blade. A blade dowel is attached to the shutter blade. A blade arm is slidably engaged with the blade dowel to open or close the shutter blade. A surface hardness of the blade dowel is higher than a surface hardness of the blade arm. The surface hardness of the blade arm is Hv300 to 900, and the surface hardness of the blade dowel is Hv450 to 1000. The blade arm and the blade dowel are subjected to chemical polishing treatment. The blade dowel is plated with nickel, chromium, palladium or rhodium. A material of the blade dowel is a free-cutting stainless steel or a carbon tool steel, and a material of the blade arm is a carbon tool steel or a titanium material.