专利汇可以提供Piezoelectrically driven telephone type-ringer专利检索,专利查询,专利分析的服务。并且A piezoelectrically driven telephone-type ringer comprises a pair of gongs, a clapper rod including a clapper mounted on a free end thereof between the gongs and a piezoelectric driver device coupled to the opposite end of the clapper rod, to provide vibratory motion thereto for engagement with the gongs. The piezoelectric device is preferably of a type similar to that shown in U.S. Pat. No. 3,676,722, including a circular bender element operable in an oil can mode; i.e. the center point thereof being displaceable alternately in opposite directions substantially perpendicular to the plane of the element. A clapper rod support structure couples the piezoelectric device to the clapper rod. The support structure is fabricated of spring metal including a planar member coupled to the piezoelectric device for movement in a direction longitudinally of the plane of the member. The clapper rod is attached to a surface of the planar member, substantially perpendicular thereto, so that energization of the element with alternately poled current causes the member to move in a back and forth motion, thereby moving the clapper rod in opposite directions into alternate engagement with the gongs. The displacement of the piezoelectric element is small, but is magnified by the provision of a relatively stiff clapper rod to produce a high system resonant frequency, greater than the frequency of alternating current conventionally applied to a telephone-type ringer. The clapper fits loosely on the clapper rod to minimize its affect on the system resonant frequency.,下面是Piezoelectrically driven telephone type-ringer专利的具体信息内容。
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