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:
Sep. 11, 2012
Filed:
Jul. 04, 2008
Yoshiharu Fukunishi, Bizen, JP;
Takanori Kitamura, Bizen, JP;
Kengo Tabata, Osaka, JP;
Toshiyuki Matsumura, Kadoma, JP;
Shuji Saiki, Kadoma, JP;
Yoshimichi Kajihara, Kadoma, JP;
Satoshi Koura, Kadoma, JP;
Yoshiharu Fukunishi, Bizen, JP;
Takanori Kitamura, Bizen, JP;
Kengo Tabata, Osaka, JP;
Toshiyuki Matsumura, Kadoma, JP;
Shuji Saiki, Kadoma, JP;
Yoshimichi Kajihara, Kadoma, JP;
Satoshi Koura, Kadoma, JP;
Kuraray Chemical Co., Ltd., Bizen-shi, JP;
Panasonic Corporation, Kadoma-shi, JP;
Abstract
A material for improving the sound pressure level at the bass reproduction limit of the present invention is composed of an activated carbon having a cumulative pore volume of 0.4 ml/g or more for the pores each having a radius of 50 angstroms or less. Preferably, this activated carbon has a cumulative pore volume of 0.1 ml/g or less for the pores each having a radius of 7 angstroms or less. In particular, when a sound pressure level improving material in which the activated carbon has a cumulative pore volume of 0.5 ml/g or more for the pores each having a radius of 18 angstroms or less is installed in a cabinet of a loudspeaker device, the material alleviates pressure fluctuations of a gas within the cabinet caused by vibration of a loudspeaker, and thus a very good bass reproduction effect is attained. Moreover, in the case where a sound pressure level improving material in which the activated carbon has a cumulative pore volume of 0.4 ml/g or more for the pores each having a radius of 18 to 50 angstroms is installed in the cabinet, a loudspeaker device having a good bass reproduction effect even in an atmosphere of high humidity is obtained.