| 摘要 |
PROBLEM TO BE SOLVED: To provide a crystal transducer of a high-frequency fundamental wave which carries a crystal elementary plate, having no gradient surface existing on an oscillation surface for suppressing spurious oscillations, in a high-frequency crystal transducer. SOLUTION: A slit is formed on the oscillation surface on the crystal elementary plate by etching, spurious signals generated in a gradient section formed in a crystal orientation of the crystal is excluded, a flat planarity is obtained on the oscillation surface on the crystal elementary plate, proper parallelism with the rear surface of the elementary plate is obtained at the same time, and the frequency of the high-frequency fundamental wave of necessary principal oscillation is obtained. At the same time, since the slit is formed on a recess thin plate-like piezoelectric elementary plate transducer of the elementary plate by using a photolithographic technique, its yield can be improved. When a crystal oscillator is constituted by the use of the crystal transducer, a highly stable high-frequency fundamental wave frequency which does not have unwanted oscillations except a main oscillation, a frequency jump or the like due to occurrence of the spurious signal is obtained, and hence general yield can be improved.
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