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Feb 27, 2014
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Panasonic Corporation announced that it has developed a loudspeaker using a diaphragm that is made with plant opals  in bamboo leaves for the first time in the industry*1 to improve sound quality. The new Bamboo Plant Opal Loudspeaker can deliver according to the original sound by reproducing clear sound with low distortion, thanks to the use of the hard, plant opal materials occurring in bamboo for the diaphragm. Samples of the new loudspeaker, which is suitable for automotive and home audio systems, will be available on March 1.
There is strong demands for high- sound quality audioboth at home and in cars. So, audio loudspeakers need to reproduce highsound quality with low distortion in wide frequencies range for meeting such demand. Therefore, loudspeaker diaphragm materials are required lightweight and highly rigidity for improving acoustic velocity as well as preventing unnecessary resonance.
Panasonic has satisfied these demands by using diaphragms made of resin containing bamboo fibers and bamboo charcoal. The diaphragm in the new loudspeaker now uses an additional bamboo-derived material - hard, needle-shaped plant opals in bamboo leaves, resulting in according to original sound with clearness and less distortion compared to the company's existing loudspeakers.
With this Bamboo Plant Opal Loudspeaker, Panasonic will help automotive and audio manufacturers for creating a finely-tuned sound, and contributing to improve sound quality in audio devices.
*1) As of February 25, 2014, for a loudspeaker diaphragm according to a Panasonic survey
*2) Loudspeakers using diaphragms made of resin mixed with bamboo fibers and bamboo charcoal
 Plant opal
Amorphous hydrous silicates (SiO2 . nH2O) that fill plant cell. Also called plant stones, plant opals have a Mohs hardness of 5-6.5 o equivalent to that of opal stones.
 Acoustic velocity
Velocity at which sound transmits through a substance. In loudspeakers, a diaphragm having a higher acoustic velocity means a wider frequency resonce.
 Internal loss
An indicator of material performance, referring to the material's ability to dissipate kinetic energy applied from external vibrations, etc. High internal loss means a reduced unnecessary resonance and better sound quality for the loudspeaker.
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