Patent ID: 8031893

Claim:
A hearing aid comprising: a sound collecting unit that collects sound; an amplifier that amplifies the sound collected by the sound collecting unit; an output unit that outputs the sound amplified by the amplifier; a human-body contact portion that comes into contact with a human body when the hearing aid is hung on an ear to be used; an ambient-air contact portion that comes into contact with ambient air when the hearing aid is hung on an ear to be used; a thermoelectric device that generates electromotive force by temperature difference between the human-body contact portion and the ambient-air contact portion; a booster that boosts the electromotive force generated by the thermoelectric device; a controller that causes the sound collecting unit, the amplifier, and the output unit to operate by voltage boosted by the booster; a first thermal conductive sheet that conducts temperature of the human-body contact portion that comes into contact with human-body to high temperature side of the thermoelectric device; and a second thermal conductive sheet that conducts temperature of the ambient-air contact portion that comes into contact with ambient air to low temperature side of the thermoelectric device.