| 摘要 |
PROBLEM TO BE SOLVED: To provide an acoustic generation device which inhibits cracks of a diaphragm and inhibits reduction of fixing force of the diaphragm and a piezoelectric element, and to provide a portable terminal.SOLUTION: An acoustic generation device of the invention includes: a piezoelectric element 1; a diaphragm 2 which is joined to a major surface of the piezoelectric element 1 and is vibrated by vibration of the piezoelectric element 1; a housing for housing at least the piezoelectric element 1; a temperature sensor 4 for measuring a temperature in the housing; and a control part which controls the vibration of the piezoelectric element 1 so as to change amplitude of the diaphragm 2 according to the temperature in the housing which is measured by the temperature sensor 4.SELECTED DRAWING: Figure 1 |
