Piezoelectric ceramic speaker using vibration sheet formed with piezoelectric ceramic
AssigneeTaiyo Yuden Co., Ltd.
InventorsGouki WATANABE, Takayuki GOTO, Keiichi HATANO, Sumiaki KISHIMOTO, Yutaka DOSHIDA
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Abstract
A piezoelectric ceramic speaker includes a piezoelectric element using a vibration sheet formed with piezoelectric ceramic having a primary phase constituted by ceramic grains of perovskite crystal structure containing Pb, Nb, Zn, Ti, and Zr, and a secondary phase constituted by ZnO grains, wherein the primary phase is constituted by ceramic grains expressed by a composition formula Pb {(Zr(1-a)Tia)x.(Ni1/3Nb2/3)y.(Zn1/3Nb2/3)z}O3 (where 0<x≦0.85, 0≦y<1, 0<z<1, x+y+z=1, and 0.45≦a≦0.60); and an enclosure which encloses the piezoelectric element.
Claims6
A piezoelectric ceramic speaker comprising:
- an acoustic element using a vibration sheet formed with a piezoelectric ceramic having a primary phase constituted by ceramic grains of perovskite crystal structure containing Pb, Nb, Zn, Ti, and Zr, and a secondary phase constituted by ZnO grains, wherein the primary phase is constituted by ceramic grains expressed by a composition formula Pb{(Zr(1-a)Tia)x.(Ni1/3Nb2/3)y.(Zn1/3Nb2/3)z}O3 (where 0<x≦0.85, 0≦y≦1, 0<z<1, x+y+z=1, and 0.45≦a≦0.60);
- and
- an enclosure which encloses the acoustic element.
A piezoelectric ceramic device comprising:
- an piezoelectric element using a vibration sheet formed with a piezoelectric ceramic having a primary phase constituted by ceramic grains of perovskite crystal structure containing Pb, Nb, Zn, Ti, and Zr, and a secondary phase constituted by ZnO grains, wherein the primary phase is constituted by ceramic grains expressed by a composition formula Pb{(Zr(1-a)Tia)x.(Ni1/3Nb2/3)y.(Zn1/3Nb2/3)z}O3 (where 0<x≦0.85, 0≦y≦1, 0<z<1, x+y+z=1, and 0.45≦a≦0.60);
- and
- an enclosure which encloses the piezoelectric element.
Dependencies are inferred from the claim text.