Acoustics – Diaphragm – Particular shape
Reexamination Certificate
2005-03-08
2005-03-08
Lockett, Kimberly (Department: 2837)
Acoustics
Diaphragm
Particular shape
C181S157000
Reexamination Certificate
active
06863153
ABSTRACT:
A speaker diaphragm10is 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 line4and recesses typically represented by a bottom line5. 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 diaphragm10vibrates 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 diaphragm10has a three-dimensional structure like a screw propeller so that the mechanical strength of the speaker diaphragm10can 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.
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International Search Report.
Notification of Refusal Reason, Japanese Patent Office, Aug. 26, 2003.
Hayakawa Junichi
Kasai Masaya
Kabushiki Kaisha Kenwood
Lockett Kimberly
Robinson Eric J.
Robinson Intellectual Property Law Office P.C.
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