公开(公告)号：US20180156640A1

公开(公告)日：2018-06-07

申请号：US15820525

申请日：2017-11-22

Applicant: MITUTOYO CORPORATION

Inventor： Hirokazu KOBAYASHI ,  Osamu KAWATOKO

IPC: G01D5/347 ,  H02J7/00 ,  H05B33/08

CPC classification number: G01D5/34715 ,  H02J7/0063 ,  H05B33/0842 ,  H05B37/0281

Abstract: An encoder includes a light source. A booster circuit boosts a power supply voltage output by a battery, and outputs the boosted voltage. The voltage is applied to one end of a light-emitting diode. A driver circuit is inserted between another end of the light-emitting diode and a ground, the driver circuit controlling current flowing through the light-emitting diode. A voltage detector circuit detects a voltage between the light-emitting diode and the driver circuit. A control circuit causes the booster circuit to boost the power supply voltage when the voltage is lower than the power supply voltage; stops the boosting performed by the booster circuit when the voltage is equal to the power supply voltage; and controls the driver circuit such that, after the voltage reaches a predetermined value, current flows to the light-emitting diode.

公开(公告)号：US20180143040A1

公开(公告)日：2018-05-24

申请号：US15804170

申请日：2017-11-06

Applicant: MITUTOYO CORPORATION

Inventor： Osamu KAWATOKO ,  Tomohiro TAHARA ,  Hirokazu KOBAYASHI

IPC: G01D5/347 ,  G11C27/02

CPC classification number: G01D5/34707 ,  G01D5/24428 ,  G01D5/34715 ,  G01D5/34746 ,  G01D5/38 ,  G11C27/026

Abstract: A reference voltage generator circuit generates a reference voltage corresponding to a power supply voltage. A current/voltage converter circuit converts a photocurrent output by a photoreceiver into voltage, and outputs a voltage obtained by adding the converted voltage and the reference voltage. A sample and hold circuit holds a voltage of a capacitor in response to a sample and hold signal, the capacitor having the voltage input at one end and the reference voltage input at another end. An amplifier circuit outputs an output signal where a voltage held by the sample and hold circuit is amplified with the reference voltage as a reference.

公开(公告)号：US20190086232A1

公开(公告)日：2019-03-21

申请号：US16138229

申请日：2018-09-21

Applicant: Mitutoyo Corporation

Inventor： Hirokazu KOBAYASHI ,  Shun MUGIKURA

IPC: G01D3/032 ,  G01D7/00

CPC classification number: G01D3/032 ,  G01D7/00 ,  G01D21/00

Abstract: There is provided a measuring device that suppresses flickering of display values displayed on a display and, at the same time, improves response of the measuring device. A measuring device includes a storage that stores information about the measuring device, control circuitry that calculates measurement results, and a display that displays the measurement results calculated by the control circuitry. The control circuitry determines whether or not filtering for suppression of a variation in display values Pn displayed on the display is to be executed and executes the filtering in response to the determination that the filtering is to be executed.

公开(公告)号：US20250052558A1

公开(公告)日：2025-02-13

申请号：US18796679

申请日：2024-08-07

Applicant: MITUTOYO CORPORATION

Inventor： Keita OGAWA ,  Hirokazu KOBAYASHI

IPC: G01B7/30 ,  G01D5/20

Abstract: There is provided a displacement measuring apparatus capable of reducing power consumption in a sleep mode. An operation mode of a signal processing unit includes a measurement operation execution mode to calculate a displacement or position as a measurement value using a sensor signal from a displacement sensor, and a sleep mode to reduce power consumption compared to the measurement operation execution mode. In the sleep mode, the signal processing unit performs a substitute calculation process at a predetermined sampling frequency to calculate a substitute value related to the displacement or position using fewer sensor signals than in the measurement operation execution mode. The operation-mode control unit assumes that a variation of the displacement sensor has been detected when there is a variation in the substitute value, cancels the sleep mode, and switches the signal processing unit to the measurement operation execution mode.

公开(公告)号：US20190257674A1

公开(公告)日：2019-08-22

申请号：US16281223

申请日：2019-02-21

Applicant: MITUTOYO CORPORATION

Inventor： Hirokazu KOBAYASHI ,  Rie ARAI

IPC: G01D5/347 ,  G01D5/245

Abstract: A position detection encoder includes a scale that has a position detection pattern and a linear pattern that is formed in a direction parallel to a length direction of the position detection pattern; and a position detector generating a position detection signal with a different value due to a displacement of the position detection pattern in the length direction. In the position detector, a position confirmation pattern is formed that includes two markers arranged at an interval equal to or less than an offset tolerance value for a positional relationship of the position detector and the scale in a width direction of the position detection pattern.