PRESSING SENSOR AND ELECTRONIC DEVICE
First Claim
1. A pressing sensor comprising:
- a piezoelectric sensor configured to generate a detection voltage corresponding to a deformation amount of a pressing surface;
a first current-voltage conversion circuit configured to convert a charge/discharge current for a capacitance of the piezoelectric sensor into a voltage signal;
a deformation amount detector configured to obtain an integrated value of an output voltage from the voltage signal of the first current-voltage conversion circuit and determine the integrated value as the deformation amount of the pressing surface;
a minute vibration sensor configured to detect presence or absence of minute vibration of the pressing surface based on a minute fluctuation state of the output voltage; and
an integration reset processor configured to reset the integrated value obtained by the deformation amount detector when the minute vibration sensor detects an absence of the minute vibration.
1 Assignment
0 Petitions
Accused Products
Abstract
A pressing sensor that includes a pressing portion deformed by pressing, a piezoelectric sensor that generates a detection voltage based on the deformation amount, and a first current-voltage conversion circuit that converts a charge/discharge current for a capacitance of the piezoelectric sensor into a voltage signal and outputs the voltage signal. Moreover, a deformation amount detector obtains an integrated value of an output voltage and detects the integrated value as the deformation amount of the pressing portion. A minute vibration sensor detects presence or absence of minute vibration of the pressing portion according to presence or absence of a minute fluctuation state of the output voltage and an integration reset processor resets the integrated value in response to absence of the minute vibration.
-
Citations
20 Claims
-
1. A pressing sensor comprising:
-
a piezoelectric sensor configured to generate a detection voltage corresponding to a deformation amount of a pressing surface; a first current-voltage conversion circuit configured to convert a charge/discharge current for a capacitance of the piezoelectric sensor into a voltage signal; a deformation amount detector configured to obtain an integrated value of an output voltage from the voltage signal of the first current-voltage conversion circuit and determine the integrated value as the deformation amount of the pressing surface; a minute vibration sensor configured to detect presence or absence of minute vibration of the pressing surface based on a minute fluctuation state of the output voltage; and an integration reset processor configured to reset the integrated value obtained by the deformation amount detector when the minute vibration sensor detects an absence of the minute vibration. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
-
-
14. A pressing sensor comprising:
-
a pressing surface deformable by a pressing force; a pressure sensor configured to generate a detection signal corresponding to a deformation amount of the pressing surface; a deformation amount detector configured to detect the deformation amount based on the detection signal generated by the pressure sensor; and a minute vibration sensor configured to detect a presence or an absence of minute vibration of the pressing surface based on a presence or an absence of a minute fluctuation state of the detection signal generated by the pressure sensor. - View Dependent Claims (15, 16, 17, 18, 19, 20)
-
Specification