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. 24, 2002
Filed:
Aug. 24, 1999
Nobuyuki Takahashi, Osaka, JP;
Hideyuki Kitai, Osaka, JP;
Kazumasa Tanaka, Osaka, JP;
Manabu Matsunaga, Osaka, JP;
Yasunori Sugihara, Osaka, JP;
Nitto Denko Corporation, Osaka, JP;
Abstract
A damping material is made of a porous member having an absolute characteristic impedance value of not less than 800 kg/m ·S in the frequency range of from 1.0 to 3.0 kHz. A damping method has steps of providing a damping material in the interior or on the periphery of a vibration-generating apparatus, characterized in that as the damping material there is used a compressible porous member having an air permeability of from 1×{fraction (1/10)} to 2×{fraction (1/10)} cc/cm /sec based on an atmospheric pressure difference of 2.039×{fraction (1/10)} mMH O or a porous member having an absolute impedance value of not less than 800 kg/m ·S in a frequency range of from 1 to 3 kHz or one obtained by providing a film layer thereon. A disc drive has a motor for rotating a disc as a data recording medium and a damping material provided in the interior and/or on the periphery of a housing having at least a space in which the disc can be mounted.