OSCILLATOR AND ELECTRONIC DEVICE
A piezoelectric element ( 20 ) is attached to a vibration member ( 10 ). A plurality of electrodes ( 22 ) are two-dimensionally arranged on one surface of the piezoelectric element ( 20 ) so as to be spaced apart from each other. A supporting frame ( 40 ) supports an edge of the vibration member ( 10 ). A control unit ( 50 ) inputs an independent driving signal to each of the plurality of electrodes ( 22 ). Thus, a large output can be obtained with a resonance frequency depending on what signal is input to which electrode ( 22 ). For example, the piezoelectric element ( 20 ) is a resin film that is formed of a high molecular material indicating a piezoelectric property.
1 . An oscillator comprising:
a vibration member;
a piezoelectric element that is attached to the vibration member;
a plurality of electrodes that are provided on one surface of the piezoelectric element and are two-dimensionally arranged so as to be spaced apart from each other;
a supporting member that supports an edge of the vibration member; and
a control unit that inputs an independent driving signal to each of the plurality of electrodes.
2 . The oscillator according to claim 1 , wherein the plurality of electrodes have the same planar shape and are arranged at equal intervals.
3 . The oscillator according to claim 1 , wherein at least some of the plurality of electrodes are arranged so as to be point-symmetrical to each other based on the center of the piezoelectric element.
4 . The oscillator according to claim 1 , wherein the piezoelectric element is constituted by a high molecular material indicating a piezoelectric property.
5 . An oscillator comprising:
a vibration member;
a piezoelectric element that is attached to the vibration member; and
a frame to which the vibration member is fixed,
wherein a plane of an inner circumference of the frame has a polygonal shape when seen in a plan view, and
wherein at least one of corners of the frame has a reinforcing member that is fixed to the frame and the vibration member.
6 . The oscillator according to claim 5 , wherein the reinforcing member does not overlap the piezoelectric element when seen in a plan view.
7 . The oscillator according to claim 5 , wherein the reinforcing member is provided at all the corners of the frame, and the reinforcing members are spaced apart from each other.
8 . The oscillator according to claim 5 , wherein the reinforcing member is an isosceles triangle in which a vertex angle is equal to an inner angle of the frame, and the reinforcing member is disposed such that the vertex angle overlaps the corner of the frame.
9 . An electronic device having an oscillator,
wherein the oscillator comprises
a vibration member,
a piezoelectric element that is attached to the vibration member,
a plurality of electrodes that are provided on one surface of the piezoelectric element and are two-dimensionally arranged so as to be spaced apart from each other,
a supporting member that supports an edge of the vibration member, and
a control unit that inputs an independent driving signal to each of the plurality of electrodes.