Sughrue, Mion, Zinn, Macpeak & Seas, PLLC
Loudspeaker with heat radiating hole and electrical device employing the same
 A loudspeaker is superior in space saving ability for enabling down-sizing of a device, to which the loudspeaker is employed, and has frequency characteristics easily designed and adjusted. The loudspeaker includes a vibration plate formed with a plurality of heat radiating through openings, and a vibrating portion responsive to an input electrical signal and driving the vibration plate for generating an acoustic vibration. 
NEC Corporation
H
H04R
inventional
Shoji
Watanabe