MATERIAL FOR SPEAKER DEVICE AND A SPEAKER DEVICE USING IT

• Main Authors: KAJIHARA YOSHIMICHI, MATSUMURA TOSHIYUKI, KITAMURA TAKANORI, TABATA KENGO, SAIKI SHUJI, FUKUNISHI YOSHIHARU, KOURA SATOSHI
• Format: Patent
• Language: English
• Published: 25.03.2010
• Subjects: CHEMISTRY; COMPOUNDS THEREOF; DEAF-AID SETS; ELECTRIC COMMUNICATION TECHNIQUE; ELECTRICITY; INORGANIC CHEMISTRY; LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKEACOUSTIC ELECTROMECHANICAL TRANSDUCERS; METALLURGY; NON-METALLIC ELEMENTS; PUBLIC ADDRESS SYSTEMS

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.