公开(公告)号：US10359285B2

公开(公告)日：2019-07-23

申请号：US15219446

申请日：2016-07-26

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Hideyuki Murakami ,  Takashi Kawai ,  Masaki Nakamura

IPC: G01C19/5776

Abstract: An angular velocity sensor including a vibration body having a sensor electrode, a driving electrode, and a monitor electrode. The monitor electrode generates a signal according to vibration of the vibration body. The sensor circuit outputs a signal representing an angular velocity applied to the vibration body. The amplitude determination circuit measures amplitude of vibration of the vibration body. A PLL circuit includes a constant voltage source for generating a constant voltage, a timing switching unit for outputting a voltage by switching selectively between the constant voltage and a voltage corresponding to the monitor signal, and a voltage-controlled oscillator for outputting an oscillation signal having a frequency corresponding to the voltage output from the timing switching unit. When the amplitude measured is smaller than a predetermined value, the timing switching unit outputs the constant voltage output from the constant voltage source and outputs a start-up mode signal.

公开(公告)号：US10345329B2

公开(公告)日：2019-07-09

申请号：US15512782

申请日：2016-07-05

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Hirotsugu Suzuki ,  Yoichi Nakayoshi ,  Masaki Nakamura

IPC: G01P15/18 ,  G01P21/00 ,  G01P15/12 ,  G01P15/03 ,  G01C19/5747 ,  G01C19/5769 ,  G01P3/02 ,  G01P15/08 ,  G01C19/5776 ,  G01P15/125 ,  H03M1/08 ,  H03M1/12

Abstract: An inertial force sensor includes: an acceleration detection element; a temperature sensor that detects an ambient temperature of the acceleration detection element; a bridge circuit that processes an output signal from the acceleration detection element; an AD converter that converts an analog signal output from the bridge circuit into a digital signal, and outputs the digital signal; a calculation circuit that performs calculation on the output signal from the AD converter; and a storage that stores correction data for correcting a variation in the output signal from the AD converter due to a temperature change. The correction data are coefficients of a formula expressed by a calibration curve that is a quadratic or higher-degree curve, and the storage stores, as the correction data, the coefficients of the calibration curve of each of a plurality of patterns that differ between a predetermined temperature or more and less than the predetermined temperature.