Thermally excited sound wave generating device
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United States of America Patent
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Issued Date -
Sep 15, 2005
app pub date -
Mar 31, 2005
filing date -
Feb 28, 2003
priority date (Note) -
Abandoned
status (Latency Note)
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Abstract
A thermally induced sound wave generating device comprising a thermally conductive substrate, a head insulation layer formed on one surface of the substrate, and a heating element thin film formed on the heat insulation layer and in the form of an electrically driven metal film, and wherein when the heat conductivity of the thermally conductive substrate is set as .alpha..sub.s and its heat capacity is set as C.sub.s, and the thermal conductivity of the beat insulation layer is set as .alpha..sub.I and its heat capacity is set as C.sub.I, relation of {fraction (1/100)}.gtoreq..alpha..sub.IC.sub.I/.alpha..sub.SC.sub.S and .alpha..sub.SC.sub.S.gtoreq.100.times.10.sup.6 is realized. This is a new technical means capable of greatly improving the function of a pressure generating device based on thermal induction.
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