| 摘要 |
PURPOSE:To form the speaker of small size and excellent in sound characteristics, by oscillating the transparent oscillation plate of specific shape with the oscillator consisting of transparent electrode and transparent piezoelectric crystal. CONSTITUTION:The bimorph oscillator consisting of transparent electrodes 21, 22 and transparent piezoelectric ceramic 13 is attached to the transparent glass plate 5 of ellipse flat plate to form a speaker. The sound volume-frequency characteristics of this speaker have no peak value at specific frequency and have flat frequency distribution in the range of 1.5-4kHz. Accordingly, simple words such as time, alarm and announcement can be announced. Thus, a speaker small in size and excellent in sound characteristics can be formed. Further, the diaphragm plate is not limited to ellipse shape. Specified frequency characteristics can be given even with chamfered polygon. |
