Piezoelectric loudspeaker and a method for manufacturing the same
First Claim
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1. A piezoelectric loudspeaker comprising:
- a compound piezoelectric sheet normally having a flat shape wherein multiple piezoelectric devices are arranged in an organic material;
an electrode provided on each face of said compound piezoelectric sheet;
an acoustic impedance matching support layer, extended to cover said electrodes, for maintaining said compound piezoelectric sheet in a curved shape and for matching an acoustic impedance, the acoustic impedance matching support layer being in direct contact with a face of the piezoelectric sheet; and
a support frame for supporting said compound piezoelectric sheet around a circumference thereof.
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Abstract
Disclosed is a piezoelectric loudspeaker.
According to the present invention, a piezoelectric loudspeaker comprises: a flat compound piezoelectric sheet in which multiple piezoelectric devices are arranged in an organic material; electrodes which are provided on respective surfaces of the compound piezoelectric sheet; an acoustic impedance matching support layer for maintaining the flat compound piezoelectric sheet in a curved shape and for matching an acoustic impedance; and a support frame for supporting the compound piezoelectric sheet at its circumference. Thus, sound reproduction with a desirable frequency properties that have little distortion can be performed.
93 Citations
27 Claims
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1. A piezoelectric loudspeaker comprising:
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a compound piezoelectric sheet normally having a flat shape wherein multiple piezoelectric devices are arranged in an organic material; an electrode provided on each face of said compound piezoelectric sheet; an acoustic impedance matching support layer, extended to cover said electrodes, for maintaining said compound piezoelectric sheet in a curved shape and for matching an acoustic impedance, the acoustic impedance matching support layer being in direct contact with a face of the piezoelectric sheet; and a support frame for supporting said compound piezoelectric sheet around a circumference thereof. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A piezoelectric loudspeaker comprising:
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a compound piezoelectric sheet normally having a flat shape wherein multiple piezoelectric devices are arranged in an organic material; an electrode provided on each face of said compound piezoelectric sheet; an acoustic impedance matching support layer, extended to cover said electrodes, for maintaining said compound piezoelectric sheet in a curved shape and for matching an acoustic impedance; a protective film for protecting one of said electrodes, said film being provided on a side of said piezoelectric sheet opposite to that on which said acoustic impedance matching support layer is formed, wherein the sum of the thicknesses of said acoustic impedance matching support layer and of said protective film is within the range of from 0.1 mm to 5.0 mm; and a support frame for supporting said compound piezoelectric sheet around a circumference thereof.
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11. A piezoelectric loudspeaker comprising:
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a compound piezoelectric sheet normally having a flat shape wherein multiple piezoelectric devices are arranged in an organic material; an electrode provided on each face of said compound piezoelectric sheet; an acoustic impedance matching support layer, extended to cover said electrodes, for maintaining said compound piezoelectric sheet in a curved shape and for matching an acoustic impedance, wherein said acoustic impedance matching support layer is formed of a comparatively soft polyurethane resin, and said organic material of said compound piezoelectric sheet is made of a comparatively hard epoxy resin; and a support frame for supporting said compound piezoelectric sheet around a circumference thereof. - View Dependent Claims (12)
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13. A piezoelectric loudspeaker comprising:
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a compound piezoelectric sheet normally having a flat shape wherein multiple piezoelectric devices are arranged in an organic material; an electrode provided on each face of said compound piezoelectric sheet; an acoustic impedance matching support layer, extended to cover said electrodes, for maintaining said compound piezoelectric sheet in a curved shape and for matching an acoustic impedance, wherein said acoustic impedance matching support layer is formed of a comparatively soft resin, and said organic material of said compound piezoelectric sheet is made of a comparatively hard resin; and a support frame for supporting said compound piezoelectric sheet around a circumference thereof.
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14. A piezoelectric loudspeaker comprising:
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a compound piezoelectric sheet normally having a flat shape wherein multiple piezoelectric devices are arranged in an organic material, wherein a thickness of said piezoelectric devices is equal to or less than 1.0 mm; an electrode provided on each face of said compound piezoelectric sheet; an acoustic impedance matching support layer, extended to cover said electrodes, for maintaining said compound piezoelectric sheet in a curved shape and for matching an acoustic impedance; and a support frame for supporting said compound piezoelectric sheet around a circumference thereof.
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15. A piezoelectric loudspeaker comprising:
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a compound piezoelectric sheet normally having a flat shape wherein multiple piezoelectric devices are arranged in an organic material, wherein a ratio W/t of a width W of said piezoelectric devices to a thickness t is 20 or less; an electrode provided on each face of said compound piezoelectric sheet; an acoustic impedance matching support layer, extended to cover said electrodes, for maintaining said compound piezoelectric sheet in a curved shape and for matching an acoustic impedance; and a support frame for supporting said compound piezoelectric sheet around a circumference thereof.
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16. A piezoelectric loudspeaker comprising:
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a compound piezoelectric sheet having a flat shape wherein multiple piezoelectric devices are arranged in an organic material; electrodes, each of which is provided on each face of said compound piezoelectric sheet; an acoustic impedance matching support layer, extended to cover said electrodes, for maintaining said compound piezoelectric sheet in a curved shape and for matching an acoustic impedance; and a support frame for supporting said compound piezoelectric sheet at a circumference, wherein a curvature radius of said curved shape is equal to or less than 30 times of a string length of an opening of said compound piezoelectric sheet. - View Dependent Claims (17, 18, 19, 20)
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21. A method, for manufacturing a piezoelectric loudspeaker, which comprises a compound piezoelectric sheet having a flat shape wherein multiple piezoelectric devices are arranged in an organic material;
- electrodes, each of which is provided on each face of said compound piezoelectric sheet;
an acoustic impedance matching support layer, extended to cover said electrodes, for maintaining said compound piezoelectric sheet in a curved shape and for matching an acoustic impedance; and
a support frame for supporting said compound piezoelectric sheet at a circumference, said piezoelectric sheet being manufactured by the steps of;forming grooves halfway in the direction of thickness in a ceramic green sheet before sintering; sintering said ceramic green sheet to provide a sintered sheet; forming multiple piezoelectric devices by dividing said sintered sheet along said grooves; and filling said grooves with said organic material, while said piezoelectric devices are separated from each other, and hardening said organic material. - View Dependent Claims (22)
- electrodes, each of which is provided on each face of said compound piezoelectric sheet;
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23. A method, for manufacturing a piezoelectric loudspeaker, which comprises a compound piezoelectric sheet having a flat shape wherein multiple piezoelectric devices are arranged in an organic material;
- electrodes, each of which is provided on each face of said compound piezoelectric sheet;
an acoustic impedance matching support layer, extended to cover said electrodes, for maintaining said compound piezoelectric sheet in a curved shape and for matching an acoustic impedance; and
a support frame for supporting said compound piezoelectric sheet at a circumference, said piezoelectric sheet being manufactured by the steps of;shaping, before sintering, comparatively soft ceramic material that consists of ceramic powder and an organic binder to employ the formation of said piezoelectric devices; forming said piezoelectric devices by annealing said ceramics materials after shaped; arranging said piezoelectric devices in a predetermined pattern by using a piezoelectric device arrangement plate that has multiple arrangement holes; filling gaps between said piezoelectric devices with said organic material and hardening said organic material. - View Dependent Claims (24)
- electrodes, each of which is provided on each face of said compound piezoelectric sheet;
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25. A method for manufacturing a piezoelectric loudspeaker, which comprises a compound piezoelectric sheet having a flat shape wherein multiple piezoelectric devices are arranged in an organic material;
- electrodes, each of which is provided on each face of said compound piezoelectric sheet;
an acoustic impedance matching support layer, extended to cover said electrodes, for maintaining said compound piezoelectric sheet in a curved shape and for matching an acoustic impedance; and
a support frame for supporting said compound piezoelectric sheet at a circumference, said piezoelectric sheet being manufactured by the steps of;annealing, before sintering, a comparatively soft ceramic material, having a thin sheet shape, that consists of ceramic powder and an organic binder; dividing said ceramics material having said thin sheet shape that is annealed by a press machine, of which press faces have predetermined raised and depressed portions, and forming said multiple piezoelectric devices; and introducing said organic material into gaps between said multiple piezoelectric devices, which are slightly separated from each other, and hardening said organic material. - View Dependent Claims (26)
- electrodes, each of which is provided on each face of said compound piezoelectric sheet;
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27. A piezoelectric loudspeaker comprising:
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a compound piezoelectric sheet having a flat shape wherein multiple piezoelectric devices are arranged in an organic material, said sheet having a first face and a second face; electrodes, each of which is provided on each face of said compound piezoelectric sheet; an acoustic impedance matching support layer located on one of said first or second faces, extended to cover said electrodes, for maintaining said compound piezoelectric sheet in a curved shape and for matching an acoustic impedance; a protective film for protecting one of said electrodes, said film provided on the other of said first or second faces opposite to that on which said acoustic impedance matching support layer is formed; and a support frame for supporting said compound piezoelectric sheet around a circumference.
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Specification