| 摘要 |
PURPOSE:To improve the configuration of an outer case and the balance of pressing forces to piezoelectric elements thereby to standardize parts in the same kind of machine by providing an outer case and a receiving case, providing two braces between the outer case and the receiving case and at the end surface of each piezoelectric element, and fitting and fixing the orter case and the receiving case at the end surface so that respective parts are located on the same axis. CONSTITUTION:A brace 10 and a piezoelectric element 5 are incorporated in an outer case 8, a receiving case 9 containing a brace 11 is fitted in and fixed to the outer case 8 at an end surface fitting portion 12. Next, a bonding agent 7 is filled in spaces formed between the piezoelectric elements 5 and the outer case 8 and receiving case 9 through a bonding agent filling hole 8a, formed in the outer case 8 and is hardened by a drier or the like. Thus, the pressing force to the piezoelectric element and the impulsive force from a impulse member are uniformly loaded, and further the strength balance between the outer case and the piezoelectric element becomes uniform. There fore, a high voltage generating characteristic, a reliability such as durability, and a stability are all increased, standardization of parts is achieved by using braces of the same parts, ant thus reduction of cost can be achieved.
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