公开(公告)号：US20230408565A1

公开(公告)日：2023-12-21

申请号：US18364226

申请日：2023-08-02

Applicant: Alps Alpine Co., Ltd.

Inventor： Kiyoshi SASAI ,  Akihisa IIKURA

IPC: G01R27/26 ,  G01R35/00

CPC classification number: G01R27/2605 ,  G01R35/005

Abstract: A calculation unit calculates a detection value of a capacitance of a capacitor based on a detection signal. A correction unit repeatedly performs a shift to a correction mode. When the correction mode is entered, the correction unit controls an AC voltage output unit so that a difference between amplitudes of first and second AC voltages changes, and obtains a correction value corresponding to a change in the detection value of the calculation unit caused by the change in the difference between the amplitudes. The correction unit corrects the detection value calculated by the calculation unit in accordance with the change in the correction values obtained in the correction mode.

公开(公告)号：US20200348347A1

公开(公告)日：2020-11-05

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

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：US20190294297A1

公开(公告)日：2019-09-26

申请号：US16441665

申请日：2019-06-14

Applicant: ALPS ALPINE CO., LTD.

Inventor： Kiyoshi SASAI ,  Tatsumi FUJIYOSHI ,  Shinichi SAGAWAI

IPC: G06F3/041 ,  H03F3/45 ,  G06F3/044 ,  G01V3/08

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：US20230361109A1

公开(公告)日：2023-11-09

申请号：US18356661

申请日：2023-07-21

Applicant: ALPS ALPINE CO., LTD.

Inventor： Akira ASAO ,  Kiyoshi SASAI

IPC: H01L27/02 ,  H01L27/06

CPC classification number: H01L27/027 ,  H01L27/0288 ,  H01L27/0629

Abstract: A first gate drive outputs a first drive voltage to turn a first transistor on upon occurrence of a condition in which a voltage at a supply terminal is higher than a voltage at a ground terminal, the output first drive voltage being higher than the voltage at the ground terminal. A second gate drive outputs a second drive voltage to turn a second transistor on, upon occurrence of a condition in which the voltage at the supply terminal is lower than the voltage at the ground terminal, the output second drive voltage being higher than the voltage at the supply terminal.

公开(公告)号：US20210294476A1

公开(公告)日：2021-09-23

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.