公开(公告)号：US10331409B2

公开(公告)日：2019-06-25

申请号：US15713903

申请日：2017-09-25

Applicant: ALPS ALPINE CO., LTD.

Inventor： Tatsumi Fujiyoshi ,  Shinichi Sagawai ,  Kiyoshi Sasai

IPC: G06F7/548 ,  G06G7/16 ,  H03D7/14

Abstract: Provided is a sine wave multiplication device of simple configuration, broad input signal level range, and minimal fluctuation in characteristics due to temperature. A signal component that corresponds to a product of an input signal Si and the third harmonic wave of a first square wave W1 included in an output signal Su1; and a signal component that corresponds to a product of the input signal Si and the fifth harmonic wave of the first square wave W1 is canceled by: a signal component that corresponds to a product of the input signal Si and the fundamental wave of a second square wave W2 included in an output signal Su2; and a signal component that corresponds to a product of the input signal Si and the fundamental wave of a second square wave W3 included in an output signal Su3.

公开(公告)号：US10817114B2

公开(公告)日：2020-10-27

申请号：US16441665

申请日：2019-06-14

Applicant: ALPS ALPINE CO., LTD.

Inventor： Kiyoshi Sasai ,  Tatsumi Fujiyoshi ,  Shinichi Sagawai

IPC: G06F3/044 ,  G06F3/041 ,  G01V3/08 ,  H03F3/45 ,  H03K17/955 ,  G01R27/26

Abstract: A capacitance detection device includes a first voltage output circuit configured to output a first alternating current voltage supplied to a shield electrode provided proximate to a detection electrode, a second voltage output circuit configured to output a second alternating current voltage whose frequency and phase are the same as that of the first alternating current voltage and whose amplitude is less than that of the first alternating current voltage, and a current output circuit configured to output a driving current Is to the detection electrode so that the difference between the voltage of the detection electrode and the second alternating current voltage becomes smaller, and output a detection signal corresponding to the driving current. The second voltage output circuit outputs a second alternating current voltage whose amplitude is adjusted so that the driving current in the absence of the object proximate to the detection electrode.

公开(公告)号：US11372036B2

公开(公告)日：2022-06-28

申请号：US16934954

申请日：2020-07-21

Applicant: Alps Alpine Co., Ltd.

Inventor： Kiyoshi Sasai ,  Masahiro Kimura

IPC: G01R27/26 ,  H03K5/26 ,  H03M1/12 ,  H03K5/00

Abstract: A sensor device includes a sensor unit that generates a detection signal having the same detection frequency as an entered sinusoidal analog signal and matching a physical quantity to be detected; a reference signal generating unit that generates a reference signal having the detection frequency, according to the entered analog signal; converting units that convert the detection signal and reference signal to digital signals in synchronization with a clock signal; a demodulating unit that multiplies the digital detection signal by each of two sinusoidal synchronization signals having the detection frequency, the phases of the two synchronization signals being shifted from each other by one-fourth of a cycle, and generates two demodulated signals free from a harmonic component; and a correcting unit that corrects the demodulated signals according to the digital reference signal so as to suppress variations, in the demodulated signals, caused by variations in the clock signal phase.

公开(公告)号：US11269450B2

公开(公告)日：2022-03-08

申请号：US17331218

申请日：2021-05-26

Applicant: Alps Alpine Co., Ltd.

Inventor： Kiyoshi Sasai ,  Kazufumi Naganuma

IPC: G06F3/041 ,  G06F3/044

Abstract: An electrostatic capacitance sensor includes: at least one detection electrode; drive electrodes, capacitors being respectively formed between the drive electrodes and the at least one detection electrode; a driver capable of causing voltages of the drive electrodes to change independently from each other; a reference voltage generator that generates a reference voltage; a detection signal generator that transfers charge so that a voltage of the at least one detection electrode approaches the reference voltage and that generates a detection signal according to the transfer of the charge; and a controller that controls the driver. The driver is capable of applying the reference voltage to each of the drive electrodes. When the driver causes a voltage of one or more of the drive electrodes to change, the controller controls the driver so as to apply the reference voltage to the remaining drive electrodes.

公开(公告)号：US10511290B2

公开(公告)日：2019-12-17

申请号：US15950327

申请日：2018-04-11

Applicant: ALPS ALPINE CO., LTD.

Inventor： Akira Asao ,  Kiyoshi Sasai ,  Tatsumi Fujiyoshi

IPC: H03K3/012 ,  G06F7/16 ,  G06G7/16 ,  G06F1/02 ,  G06F3/041 ,  G06F3/044 ,  H03K5/00

Abstract: In a sine-wave multiplier, signal components included in an output signal Qu1 and corresponding to the product of a third-order harmonic component of a first square wave W1 and an input signal Vi and the product of a fifth-order harmonic component of the first square wave W1 and the input signal Vi are offset by a signal component included in an output signal Qu2 and corresponding to the product of a fundamental component of a second square wave W2 and the input signal Vi and a signal component included in an output signal Qu3 and corresponding to the product of a fundamental component of a second square wave W3 and the input signal Vi.