スターリングサイクルを応用した熱スピーカーの原理

抄録

In this paper, as a new application of Stirling cycle, it is proposed to apply the Stirling cycle to heat speaker which amplifies sound vibration by means of the thermal energy. The heat speaker is composed of a pressure vessel whose capacity is variable, a displacer to which a voice coil is attached, a vibration board attached to the pressure vessel and a permanent magnet placed around the vessel. The displacer with voice coil is vibrated by the magnetic force which is generated by electric current of sound signal flowing in the voice coil. The vibrating displacer makes the air come and go between the hot side and the cold side in the pressure vessel. The air temperature goes up and down, and then the pressure follows it. The capacity of the vessel repeats expansion and shrinkage by the pressure change of the air. The moving vessel vibrates the vibration board and it yields the sound.