公开(公告)号：US20230004072A1

公开(公告)日：2023-01-05

申请号：US17574609

申请日：2022-01-13

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Yuuki ISHII ,  Kenji NISHIYAMA ,  Noritaka KISHI ,  Takaaki MORI ,  Masaaki TAKATA ,  Takahide NAKADOI ,  Nobumasa KITAMORI

IPC: G03B17/56 ,  B06B1/06 ,  B06B1/02 ,  G02B27/00

Abstract: A vibration device includes a light-transmissive body, and a vibrator to vibrate the light-transmissive body at a vibration acceleration of equal to or more than about 1.5×105 m/s2 and equal to or less than about 8.0×105 m/s2.

公开(公告)号：US20210370358A1

公开(公告)日：2021-12-02

申请号：US17399164

申请日：2021-08-11

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Takaaki MORI

IPC: B08B3/12 ,  G02B27/00 ,  B08B3/02 ,  B08B13/00

Abstract: A cleaning apparatus includes an imaging section, a protective cover in a field of view of the imaging section, a vibrator to vibrate the protective cover, a piezoelectric driver to drive the vibrator, a cleaning liquid discharger to discharge a cleaner onto a surface of the protective cover, and a signal processing circuit to control the piezoelectric driver. The signal processing circuit controls the piezoelectric driver such that the protective cover is vibrated at a resonant frequency for a predetermined period after the cleaning liquid is caused to be discharged and controls the piezoelectric driver such that, after the predetermined period, vibration of the protective cover is stopped or the protective cover is vibrated at a frequency other than the resonant frequency.

公开(公告)号：US20230258924A1

公开(公告)日：2023-08-17

申请号：US18134073

申请日：2023-04-13

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Kenji NISHIYAMA ,  Takaaki MORI

IPC: G02B27/00 ,  B08B7/02 ,  B08B3/02 ,  B08B13/00 ,  B08B3/12 ,  B08B7/04 ,  B06B1/06

CPC classification number: G02B27/0006 ,  B08B7/028 ,  B08B3/02 ,  B08B13/00 ,  B08B3/12 ,  B08B7/04 ,  B06B1/06 ,  B60S1/56

Abstract: A cleaning device includes a housing holding an imaging device, a protective cover located in a field of view of the imaging device, a vibrator to vibrate the protective cover, a piezoelectric driver to drive the vibrator, a cleaning liquid discharger to discharge, onto a surface of the protective cover, a cleaning liquid including an abrasive, and a signal processing circuit to control the piezoelectric driver and the cleaning liquid discharger. When causing the cleaning liquid discharger to discharge the cleaning liquid, the signal processing circuit can control the piezoelectric driver such that the protective cover is vibrated at a vibration acceleration of larger than about 8.0×105 m/s2 and equal to or less than about 21.0×105 m/s2.

公开(公告)号：US20240421727A1

公开(公告)日：2024-12-19

申请号：US18819141

申请日：2024-08-29

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Takaaki MORI ,  Masaaki TAKATA ,  Noritaka KISHI

IPC: H02N2/14 ,  H02N2/16

Abstract: The present disclosure relates to a method of controlling a vibration device including a piezoelectric element via a control device. The method includes changing a frequency of a drive signal for driving the piezoelectric element, measuring a value related to an impedance of the piezoelectric element, and determining a driving frequency for driving the piezoelectric element based on a change in the measured value related to the impedance of the piezoelectric element. The changing of the frequency of the drive signal includes changing a clock width such that a clock width of a first portion of clocks among a plurality of clocks included in the drive signal and a clock width of a second portion of clocks among a plurality of clocks are different from each other.

公开(公告)号：US20220134760A1

公开(公告)日：2022-05-05

申请号：US17574612

申请日：2022-01-13

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Masaaki TAKATA ,  Yuzo MIZUSHIMA ,  Takaaki MORI

IPC: B41J2/165

Abstract: A cleaning device includes a protection cover in a viewing field of a camera, a piezoelectric material to vibrate the protection cover, a driver to drive the piezoelectric material, a vibrator to detect a signal related to a vibration level of the protection cover vibrated with the piezoelectric material, and a controller to control the driver based on a signal detected by the vibration sensor so that the signal detected by the vibrator matches a predetermined target value of the vibration level of the protection cover.

公开(公告)号：US20210084199A1

公开(公告)日：2021-03-18

申请号：US17108034

申请日：2020-12-01

Applicant: Murata Manufacturing Co., Ltd.

Inventor： Noritaka KISHI ,  Hitoshi SAKAGUCHI ,  Masaaki TAKATA ,  Masaru AMANO ,  Takaaki MORI

IPC: H04N5/217 ,  G02B27/00

Abstract: In a cleaning device, a signal processing circuit determines that a foreign substance has adhered to a surface of a protection cover based on at least two pieces of information among a change amount of a resonant frequency when a vibration portion is driven at a first voltage, a change amount of a current value relating to an impedance detected by an impedance detector, and a temporal change of an image captured by an imaging portion, and cleans the surface of the protection cover by controlling the vibration portion in accordance with the determination.