Murata Manufacturing Co., Ltd.

Masayuki Ichimaru

Masahiro Kitai

Jiro Inoue

Jun Tabota

Muneharu Yamashita

Hiroshi Asano

Toshihiro Mizuno

Yuya Genmei

A piezoelectric sensor is fixed to a detection object and detects distortion of the detection object includes first and second principal surfaces, and extends in the lengthwise direction. The piezoelectric sensor includes a piezoelectric body whose polarization axis extends in a direction parallel or substantially parallel to the lengthwise direction, and first and second detecting electrodes that are provided on a surface of the piezoelectric body and that extend in a direction parallel or substantially parallel to the lengthwise direction. Distortion of the detection object is detected based on electric output corresponding to shear stress of the piezoelectric body.

Piezoelectric sensor and detecting device

An angular acceleration detection device includes a rotating weight, a fixed portion, a support beam, and a detection portion. The rotating weight is rotatable about a Z-axis with respect to the fixed portion by action of an inertial force generated by an angular acceleration about the Z-axis. The fixed portion is disposed at a position spaced from the rotating weight. The support beam is disposed in an X-Y plane between the fixed portion and the rotating weight, the support beam elastically supporting the rotating weight with respect to the fixed portion. The detection portion outputs a detection signal corresponding to stress generated in the support beam. A gravity center position of the rotating weight is aligned with the support beam when viewed in a Z-axis direction.

Angular acceleration detection device

An angular acceleration sensor includes a planar surface extending along an X-Y plane, a fixed portion, a weight, a beam, and piezoresistors. The weight is supported by the fixed portion. The beam extends along an Y-axis and is connected to the fixed portion and the weight. The beam includes through-holes extending therethrough in a Z-axis direction and protrusions protruding in an X-axis direction. The positions of the piezoresistors in the Y-axis direction overlap those of the through-holes and are displaced from those of the width-direction protrusions.

Angular acceleration sensor and acceleration sensor

An angular acceleration sensor includes a planar surface extending along an X-Y plane, a fixed portion, a weight, a beam, and piezoresistors. The weight is supported by the fixed portion. The beam extends along a Y-axis and is connected to the fixed portion and the weight. A width of the beam in an X-axis direction is larger than a width of the connection portion at which the beam is connected to the fixed portion.

An acceleration sensor 1 comprises a circuit board 3 on which an acceleration detecting element 2 is carried. A plurality of connecting terminals 4 arranged along the periphery of the circuit board 3 are projected outward after penetrating through a metal base plate 5. The metal base plate 5 is fixed to the connecting terminals 4 spaced apart from the circuit board 3 by a predetermined distance in a state being insulated from the connecting terminals 4. The peripheral edge of the metal base plate 5 is connected to a case 7 covering the entire acceleration sensor 1. Circuit elements constituting a signal processing circuit for processing a detection signal of the acceleration detecting element 2 are arranged on the upper surface and the lower surface of the circuit board 3.

Growing community of inventors

Nagaokakyo, Japan

Masayuki Ichimaru