公开(公告)号：US20230417549A1

公开(公告)日：2023-12-28

申请号：US18340055

申请日：2023-06-23

Applicant: SEIKO EPSON CORPORATION

Inventor： Hideyuki YAMADA ,  Hideo HANEDA ,  Shinichi WAKABAYASHI ,  Tatsuya TAKAHASHI

IPC: G01C19/5776

CPC classification number: G01C19/5776

Abstract: Provided is a physical quantity sensor attached to an electronic device provided with an actuator. The physical quantity sensor includes: a sensor element configured to output a detection signal corresponding to a physical quantity; and a circuit device configured to output an actuator drive signal for driving the actuator based on the detection signal. The circuit device has a resonance characteristic measurement mode of outputting the actuator drive signal for measuring a resonance characteristic of the electronic device by vibrating the electronic device, and a vibration-damping mode of outputting the actuator drive signal for reducing a vibration of the electronic device based on the resonance characteristic measured in the resonance characteristic measurement mode.

公开(公告)号：US20240333898A1

公开(公告)日：2024-10-03

申请号：US18616601

申请日：2024-03-26

Applicant: SEIKO EPSON CORPORATION

Inventor： Shinichi WAKABAYASHI ,  Tatsuya TAKAHASHI ,  Hideyuki YAMADA ,  Yasuhiro SUDO

IPC: H04N9/31 ,  G01H1/00

CPC classification number: H04N9/3194 ,  G01H1/00

Abstract: A projector device includes: a projector supported in a suspended state by a supporting device; a vibration generation device that generates a vibration acting on at least one of the supporting device and the projector; a vibration detection device that detects a vibration of the projector; and a reporting device that compares a detection value detected by the vibration detection device with a reference value and gives a report when a reporting condition is satisfied.

公开(公告)号：US20210226645A1

公开(公告)日：2021-07-22

申请号：US17150105

申请日：2021-01-15

Applicant: Seiko Epson Corporation

Inventor： Hideyuki YAMADA ,  Atsushi TANAKA

IPC: H03M1/12 ,  H03M1/06 ,  G01C19/5776

Abstract: A physical quantity detection circuit includes an analog/digital conversion circuit having an input capacitance and sampling an analog signal in the input capacitance to convert the analog signal into a digital signal, a precharge circuit for precharging the input capacitance before the analog/digital conversion circuit sample the analog signal in the input capacitance, a digital arithmetic circuit for performing arithmetic processing to the digital signal, and a reference voltage circuit for supplying a power supply voltage to the precharge circuit and the digital arithmetic circuit, wherein the arithmetic processing start timing and the arithmetic processing end timing of the digital arithmetic circuit are set to the timings avoiding the precharge period in which the precharge circuit precharges the input capacitance.

公开(公告)号：US20200240785A1

公开(公告)日：2020-07-30

申请号：US16751584

申请日：2020-01-24

Applicant: SEIKO EPSON CORPORATION

Inventor： Hideyuki YAMADA ,  Hideo HANEDA

IPC: G01C19/5776

Abstract: A physical quantity detection circuit includes a passive filter that receives a first analog signal based on an output signal of a physical quantity detection element, an analog/digital conversion circuit, and a precharge circuit that includes an operational amplifier, a first chopper circuit provided between the passive filter and the operational amplifier, and a second chopper circuit provided between the operational amplifier and the input capacitance of the analog/digital conversion circuit and precharges an input capacitance of the analog/digital conversion circuit, the first and the second chopper circuits perform a chopping operation in synchronization with an operation that the analog/digital conversion circuit samples the second analog signal at the input capacitance, based on an output signal of the passive filter.

公开(公告)号：US20230417550A1

公开(公告)日：2023-12-28

申请号：US18340071

申请日：2023-06-23

Applicant: SEIKO EPSON CORPORATION

Inventor： Hideyuki YAMADA ,  Hideo HANEDA

IPC: G01C19/5776

CPC classification number: G01C19/5776

Abstract: Provided is a physical quantity sensor attached to an electronic device provided with an actuator. The physical quantity sensor includes: a sensor element configured to output a detection signal corresponding to a physical quantity; a memory configured to store a resonance characteristic of the electronic device; a signal output circuit configured to output an actuator drive signal for driving the actuator to reduce a vibration corresponding to the resonance characteristic included in vibrations of the electronic device indicated by the detection signal; and an interface circuit configured to rewrite the resonance characteristic stored in the memory according to an external signal.