PIEZOELECTRIC SPEAKER, SPEAKER APPARATUS, AND TACTILE FEEDBACK APPARATUS
First Claim
1. A piezoelectric speaker comprising:
- a laminated body having a plurality of polymer sheets, wherein at least one of the plurality of polymer sheets is a piezoelectric sheet having a predetermined stretching axis and composed of a chiral polymer;
first and second electrodes positioned within a vibration region on opposing first and second main surfaces of the piezoelectric sheet, whereinat least one of the first and second electrodes is a divided electrode that includes a plurality of divided electrode portions, the plurality of divided electrode portions being separated by a plurality of dividing lines extending in a radiation direction, and the plurality of electrode portions being distributed along an outer peripheral portion of the vibration region except for a central portion,the plurality of dividing lines have any one of angles within a range of (1) 0 degrees or more and less than 40 degrees with respect to the stretching axis and (2) more than 50 degrees to 90 degrees or less with respect to the stretching axis.
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Accused Products
Abstract
A piezoelectric speaker that includes an electrode formed on opposing main surfaces of a piezoelectric sheet having a predetermined stretching axis and made of a chiral polymer. The electrode is divided into four electrode portions by a plurality of dividing lines extending in a radiation direction. The four electrode portions are distributed along the outer peripheral portion except for the central portion of a vibration region. Voltage is applied to the respective four electrode portions in such a manner that electric field vectors generated in the thickness direction of the piezoelectric sheet direct in opposite directions between the adjacent ones of four sheet portions of the piezoelectric sheet to which voltage is applied by the electrode portions.
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Citations
25 Claims
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1. A piezoelectric speaker comprising:
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a laminated body having a plurality of polymer sheets, wherein at least one of the plurality of polymer sheets is a piezoelectric sheet having a predetermined stretching axis and composed of a chiral polymer; first and second electrodes positioned within a vibration region on opposing first and second main surfaces of the piezoelectric sheet, wherein at least one of the first and second electrodes is a divided electrode that includes a plurality of divided electrode portions, the plurality of divided electrode portions being separated by a plurality of dividing lines extending in a radiation direction, and the plurality of electrode portions being distributed along an outer peripheral portion of the vibration region except for a central portion, the plurality of dividing lines have any one of angles within a range of (1) 0 degrees or more and less than 40 degrees with respect to the stretching axis and (2) more than 50 degrees to 90 degrees or less with respect to the stretching axis. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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Specification