JPS5575399A - Electro-mechanical transducer - Google Patents

Abstract

PURPOSE:To ensure the effective radiation for the generated heat even in case the large input is supplied by providing the evaporation part to the mobile part of the voice coil or the like for evaporation of the generated vapor and then condensing the vapor at the yoke part for radiation of the condensation heat to outside. CONSTITUTION:The inside of sealed container 35 is made vacuum, and then a fixed amount of operating fluid is enslosed. This fluid is carried via the capillary action of wicks 23 and 26-30 which cover over the inner wall surface of container 35 to make the wicks damp. Accordingly, wick 23 on voice coil 21 is also made damp. The evaporation starts largely according to the heat generation of coil 21 due to the input electric signal to absorb the evaporation heat from coil 21 since the inside of container 35 features the saturation vapor pressure. This vapor is then condensed on wicks 28-30 on the inner wall surface of the yoke featuring a low level of the heat resistance to the outer air within container 35 and via heat sink 36, thus the condensation heat being radiated outside sink 36 through the yoke. While the condensation liquid on the inner wall surface of the yoke is carried to sheet wick 23 on coil 21 by all wicks to be evaporated with the coil heat.