Pressure Detection Device and Input Device
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Accused Products
Abstract
A piezoelectric sensor capable of position detection and load detection within the sensor. The sensor includes a piezoelectric layer that generates an electric charge when pressed by an inputting means, a first electrode that is arranged on a first main face of the piezoelectric layer, a second electrode that is arranged on a second main face of the piezoelectric layer opposite the first main face, a first capacitor or a first resonant circuit connected to the first electrode, and a first detection section connected to the first electrode.
37 Citations
22 Claims
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1-14. -14. (canceled)
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15. A pressure detection device comprising:
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a piezoelectric layer that generates an electric charge when pressed by an inputting means; a first electrode that is arranged on a first main face of the piezoelectric layer; a first capacitor connected to the first electrode; a first multiplexer connected to the first electrode and the first capacitor; a first detection section connected to the first multiplexer; a second electrode that is arranged on a second main face of the piezoelectric layer opposite the first main face; a second capacitor connected to the second electrode; a second multiplexer connected to the second electrode and the second capacitor; a second detection section connected to the second multiplexer; wherein the first electrode includes a plurality of first electrode sections connected to the first capacitor; the first multiplexer is configured to selectively connect the plurality of the first electrode sections to the first detection section; wherein the second electrode includes a plurality of second electrode sections connected to the second capacitor; the second multiplexer is configured to selectively connect the plurality of the second electrode sections to the second detection section; and the first detection section includes; a first amplifier section connected to the first multiplexer; a first voltage detector connected to the first amplifier section; and a first band-pass filter connected between the first amplifier section and the first voltage detector and having a frequency (f1) represented by a following formula (1),
f1=1/(T1×
2)
formula (1)where T1=a period required from connection of the first detection section to one first electrode section to connection thereof to another first electrode section. - View Dependent Claims (16, 17, 18)
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19. A pressure detection device comprising:
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a piezoelectric layer that generates an electric charge when pressed by an inputting means; a first electrode that is arranged on a first main face of the piezoelectric layer; a first capacitor connected to the first electrode; a first multiplexer connected to the first electrode and the first capacitor; a first detection section connected to the first multiplexer; a second electrode that is arranged on a second main face of the piezoelectric layer opposite the first main face; a second capacitor connected to the second electrode; a second multiplexer connected to the second electrode and the second capacitor; a second detection section connected to the second multiplexer; wherein the first electrode includes a plurality of first electrode sections connected to the first capacitor; the first multiplexer is configured to selectively connect the plurality of the first electrode sections to the first detection section; wherein the second electrode includes a plurality of second electrode sections connected to the second capacitor; the second multiplexer is configured to selectively connect the plurality of the second electrode sections to the second detection section; and the second detection section includes; a second amplifier section connected to the second multiplexer; a second voltage detector connected to the second amplifier section; and a second band-pass filter connected between the second amplifier section and the second voltage detector and having a frequency (f2) represented by a following formula (2),
f2=1/(T2×
2)
formula (2)where T2=a period required from connection of the second detection section to one second electrode section to connection thereof to another second electrode section. - View Dependent Claims (20, 21, 22)
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Specification