US 12,405,176 B2
Bending sensor and electronic apparatus
Yuuki Tachibana, Nagaokakyo (JP); and Shiori Nagamori, Nagaokakyo (JP)
Assigned to MURATA MANUFACTURING CO., LTD., Nagaokakyo (JP)
Filed by Murata Manufacturing Co., Ltd., Nagaokakyo (JP)
Filed on Apr. 21, 2022, as Appl. No. 17/660,106.
Application 17/660,106 is a continuation of application No. PCT/JP2021/020899, filed on Jun. 1, 2021.
Claims priority of application No. 2020-104439 (JP), filed on Jun. 17, 2020.
Prior Publication US 2022/0244114 A1, Aug. 4, 2022
Int. Cl. G01L 1/16 (2006.01); G01D 1/04 (2006.01); G01D 1/16 (2006.01); G01L 25/00 (2006.01); G09F 9/30 (2006.01)
CPC G01L 1/16 (2013.01) [G01L 25/00 (2013.01); G09F 9/301 (2013.01); G01D 1/04 (2013.01); G01D 1/16 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A bending sensor comprising:
a piezoelectric element disposed on a bendable substrate;
a voltage detection circuit configured to detect a voltage generated in the piezoelectric element; and
an arithmetic unit configured to calculate an integrated value by integrating the voltage detected by the voltage detection circuit and to associate the integrated value with a bending angle of the substrate, wherein the arithmetic unit is further configured to:
calculate, in advance, a corrected integrated value obtained by correcting a maximum value of the integrated value with a decrease value resulting from a stress relieving effect of the bending sensor,
associate the corrected integrated value with a first bending angle of the substrate, and
normalize the calculated integrated value based on the corrected integrated value,
wherein the bendable substrate is configured to be bent at a first folding position along an X axis or configured to be bent at a second folding position along a Y axis, wherein the X axis extends in a width direction of the bending sensor and the Y axis extends in a length direction of the bending sensor, and
wherein, when the integrated value exceeds the corrected integrated value, the arithmetic unit is configured to change the integrated value based on a difference between the integrated value and the corrected integrated value.