| 摘要 |
<P>PROBLEM TO BE SOLVED: To reduce and suppress an audible sound more surely than a conventional art, in a piezoelectric transformer drive circuit which controls a sound by using, in particular, a time-division light modulation system. <P>SOLUTION: The piezoelectric transformer drive circuit comprises a piezoelectric transformer which is inputted with a voltage from a primary electrode, and in which the primary electrode for outputting the voltage to a load from a secondary electrode and the secondary electrode are insulated from each other; and a drive circuit which is driven, by outputting a necessary waveform to the primary electrode of the piezoelectric transformer. The piezoelectric transformer drive circuit is also driven by the time-division light modulation system. In the front stage of the primary electrode of the piezoelectric transformer, there is arranged a filter 21, through which a drive frequency band region of the piezoelectric transformer and a light-modulation frequency band region of the time-division light modulation system is made to pass through. <P>COPYRIGHT: (C)2009,JPO&INPIT |
