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A tube-shaped piezoelectric conversion element and a method of fabricating a tube-shaped piezoelectric conversion element are provided. The piezoelectric conversion element is formed either with two electroded piezoelectric sheet elements (two-layer type) rolled up in a tube-shaped member or with a

A tube-shaped piezoelectric conversion element and a method of fabricating a tube-shaped piezoelectric conversion element are provided. The piezoelectric conversion element is formed either with two electroded piezoelectric sheet elements (two-layer type) rolled up in a tube-shaped member or with a single piezoelectric sheet element (single-layer type) electroded on two opposing surfaces and folded near its center and rolled up in a tube shaped member. A non-electrode surface portion without electrode material disposed thereon is provided on at least one electroded surface of at least one piezoelectric sheet element at an end of the piezoelectric sheet element in a direction intersecting a tube-axis direction. At lease one non-electrode surface portion may also be provided on a piezoelectric sheet element in a region encompassing the fold of single-layer type device. Short circuiting between electrode layers is thereby substantially avoided at ends of the piezoelectric sheet elements or in the fold region.

대표청구항 ▼

A tube-shaped piezoelectric conversion element and a method of fabricating a tube-shaped piezoelectric conversion element are provided. The piezoelectric conversion element is formed either with two electroded piezoelectric sheet elements (two-layer type) rolled up in a tube-shaped member or with a

A tube-shaped piezoelectric conversion element and a method of fabricating a tube-shaped piezoelectric conversion element are provided. The piezoelectric conversion element is formed either with two electroded piezoelectric sheet elements (two-layer type) rolled up in a tube-shaped member or with a single piezoelectric sheet element (single-layer type) electroded on two opposing surfaces and folded near its center and rolled up in a tube shaped member. A non-electrode surface portion without electrode material disposed thereon is provided on at least one electroded surface of at least one piezoelectric sheet element at an end of the piezoelectric sheet element in a direction intersecting a tube-axis direction. At lease one non-electrode surface portion may also be provided on a piezoelectric sheet element in a region encompassing the fold of single-layer type device. Short circuiting between electrode layers is thereby substantially avoided at ends of the piezoelectric sheet elements or in the fold region. unai et al.; US-5814540, 19980900, Takemura et al.; US-5818076, 19981000, Zhang et al.; US-5821138, 19981000, Yamazaki et al.; US-5824573, 19981000, Zhang et al.; US-5824574, 19981000, Yamazaki et al.; US-5830784, 19981100, Zhang et al.; US-5837619, 19981100, Adachi et al.; US-5840118, 19981100, Yamazaki; US-5843225, 19981200, Takayama et al.; US-5843833, 19981200, Ohtani et al.; US-5851862, 19981200, Ohtani et al.; US-5858823, 19990100, Yamazaki et al.; US-5869362, 19990200, Ohtani; US-5869363, 19990200, Yamazaki et al.; US-5879977, 19990300, Zhang et al.; US-5882960, 19990300, Zhang et al.; US-5886366, 19990300, Yamazaki et al.; US-5888857, 19990300, Zhang et al.; US-5888858, 19990300, Yamazaki et al.; US-5897347, 19990400, Yamazaki et al.; US-5904770, 19990500, Ohtani et al.; US-5923962, 19990700, Ohtani et al.; US-5959314, 19990900, Voutsas et al.; US-5962872, 19991000, Zhang et al.; US-5970330, 19991000, Buynoski; US-5998841, 19991200, Suzawa; US-6303963, 20011000, Ohtani et al.