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:
May. 01, 2007
Filed:
Sep. 05, 2003
Applicants:
Shoichi Kaneda, Tokyo, JP;
Takayuki Kumagai, Tokyo, JP;
Yuichi Hashimoto, Tokyo, JP;
Inventors:
Assignee:
Namiki Seimitsu Houseki Kabushiki Kaisha, Tokyo, JP;
Attorneys:
Primary Examiner:
Int. Cl.
CPC ...
H04R 25/00 (2006.01);
U.S. Cl.
CPC ...
Abstract
By having multiple air passage holesin the housingand by creating a clearance Gbetween the outer surface of the yokeand the inner surface of the housingthe measurement of the clearance being confined to a range exceeding 0% but not exceeding 2.5% of the inner radius of the housing, the amount of air movement is limited by the clearance Gand by this means the frequency range within which the desired acceleration can be attained is expanded.