公开(公告)号：US20170276696A1

公开(公告)日：2017-09-28

申请号：US15617777

申请日：2017-06-08

Applicant: PANASONIC INTELLECTUAL PROPERTY MANAGEMENT CO., LTD.

Inventor： Hitoshi YOSHIDA ,  Nobuyuki IBARA ,  Hideki UEDA ,  Takeshi OKADA ,  Takeshi MORI ,  Masatoshi NOMURA ,  Katsumi KAKIMOTO ,  Yuji SUZUKI

IPC: G01P15/125 ,  G01P15/08 ,  G01P15/18

CPC classification number: G01P15/125 ,  G01P15/0802 ,  G01P15/18 ,  G01P2015/0831

Abstract: An acceleration sensor includes a weight portion having a recess section and a solid section, beam portions, a movable electrode provided on the opposite surface of the weight portion from an open surface of the recess section to extend over the recess section and the solid section, a first fixed electrode arranged at the opposite side of the movable electrode from the recess section, and a second fixed electrode arranged at the opposite side of the movable electrode from the solid section. The acceleration sensor detects acceleration using a change in capacitance between the movable electrode and the fixed electrodes caused by rotation of the weight portion. The beam portions are shifted toward the recess section such that an angle between a perpendicular line extending from a gravity center position of the weight portion to the rotation axis and a surface of the movable electrode becomes equal to 45 degrees.

公开(公告)号：US20190281398A1

公开(公告)日：2019-09-12

申请号：US16297907

申请日：2019-03-11

Applicant: Panasonic Intellectual Property Management Co., Ltd.

Inventor： Takahiro YAMAGUCHI ,  Toshihiro EZAKI ,  Kenichi KUBOTA ,  Masaru MATSUOKA ,  Yuji SUZUKI ,  Junji ARAKI ,  Shinichi TAKAYAMA

IPC: H04R29/00 ,  G10K11/16

Abstract: In a noise reduction device that generates and outputs a control sound signal for reducing noise, an internal loop control unit controls an internal loop in which a pre-output control sound signal that is acquired from a control sound output unit before output to a speaker is input to a sound receiver. A measurement unit measures an input level of a microphone sound signal and an input level of the pre-output control sound signal that has been input to the sound receiver in the internal loop. A fault detector uses the input level of the microphone sound signal and the input level of the pre-output control sound signal measured by the measurement unit to detect a fault in any one of the microphone, the sound receiver, the speaker, and the control sound output unit. A transmitter sends a result of fault detection performed by the fault detector to a management device.