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AssigneeNgk Spark Plug Co., Ltd.
InventorsShigeo Saito, Tsutomu Tsunooka
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The present invention provides a piezoelectric transducer and pickup means using the same for electrical string instruments, the transducer comprising a long and flat outer layer of flexible material and a flexible piezoelectric cable which is buried therein and has a center electrode, a piezoelectric layer formed on the outer periphery of the said electrode and an outer electrode formed on the outer periphery of the said layer, the stiffness thereof being enhanced by either using elastomer of the hardness of more than 80 as measured by the Spring Hardness Test Method in the Physical Testing Method for Vulcanizing Rubber of Japanese Industrial Standard (JIS K 6301) as the material for the outer layer, or by plaiting (braiding) metal wires or by winding the outer electrode of the piezoelectric cable in such a manner as to enable it to press against the piezoelectric layer.
A piezoelectric transducer for electrical string instruments comprising a long and flat outer layer of flexible material, a flexible piezoelectric cable being buried therein and having a center electrode, a piezoelectric layer formed on the outer periphery of the said electrode and an outer electrode formed on the outer periphery of the said piezoelectric layer, the material for the said outer layer having a hardness in the range from 85 to 98 as measured by Spring Type Hardness Test according to JIS K 6301 (1975), thereby increasing the stiffness of the piezoelectric transducer.
A pickup means for electrical string instruments which is so constructed as to convert the oscillation of a plurality of strings into electrical signals by a piezoelectric transducer, said piezoelectric transducer comprising a long and flat outer layer of flexible material, a flexible piezoelectric cable being buried therein and having a center electrode, a piezoelectric layer formed on the outer periphery of the said electrode and an outer electrode formed on the outer periphery of the said piezoelectric layer, the material for the said outer layer having a hardness in the range from 85 to 98 as measured by Spring Type Hardness Test according to JIS K 6301 (1975), thereby increasing the stiffness of the piezoelectric transducer.
Dependencies are inferred from the claim text.