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:
Mar. 08, 2005
Filed:
Apr. 24, 2000
Junichi Hayakawa, Kawasaki, JP;
Masaya Kasai, Kodaira, JP;
Junichi Hayakawa, Kawasaki, JP;
Masaya Kasai, Kodaira, JP;
Kabushiki Kaisha Kenwood, Tokyo, JP;
Abstract
A speaker diaphragmis provided having an improved quality of radiation sounds and a good outer appearance. The speaker diaphragm has in its slanted area projections typically represented by a peak lineand recesses typically represented by a bottom line. The projection typically represented by the peak line extends radially from the central area to the edge portion, and curves along the circumferential direction as it comes near to the edge portion. While the speaker diaphragmvibrates at a large amplitude and moves toward the bottom side thereof, a rotation force is applied to air which is likely to concentrate upon the central area to thereby lower the air pressure to the central area. The speaker diaphragmhas a three-dimensional structure like a screw propeller so that the mechanical strength of the speaker diaphragmcan be increased over the whole area thereof and division vibrations can be suppressed. The speaker diaphragm is manufactured by ejection molding of material containing polypropylene as it main composition so that a variety of colors can be easily used during manufacture processes. In cooperation with the unique structure like the screw propeller, a strong visual impression is given.