Inventor · disambiguated record
Hirofumi Okumura
Also filed as: OKUMURA HIROFUMI
25 granted patents·5 pending applications·425 citations·filing 1993–2025
96Inventor score
Top patents by PatentIndex Score
30 records- 0194US6341426B1Rotation angle sensor and torque sensorALPS ELECTRIC CO LTD·Filed 2000·Granted Jan 29, 2002·64 cites·7 claims
- 0294US6246232B1Rotation sensor for generating electric signals corresponding to turning angle and turning direction of detection targetALPS ELECTRIC CO LTD·Filed 2000·Granted Jun 12, 2001·74 cites·13 claims
- 0390US6496003B1Magnetic displacement detecting device having linear changing magnetic field over the length of the serviceFiled 2000·Granted Dec 17, 2002·50 cites·18 claims
- 0478US6900713B2Magnetic switch capable of instantaneous switching of an output signal and magnetic sensorALPS ELECTRIC CO LTD·Filed 2002·Granted May 31, 2005·22 cites·6 claims
- 0578US6720762B2Rotation-angle detecting device capable of detecting absolute angle with simple configurationALPS ELECTRIC CO LTD·Filed 2003·Granted Apr 13, 2004·19 cites·6 claims
- 0676US6424147B1Rotation angle detection apparatus for calculating a rotation angle by attaining an arctangent angle of a dividend where a small amplitude absolute value of two sinusoidal wave detection signals having a phase difference is divided by a large amplitude absolute valueALPS ELECTRIC CO LTD·Filed 2000·Granted Jul 23, 2002·26 cites·8 claims
- 0775US7064537B2Rotation angle detecting deviceALPS ELECTRIC CO LTD·Filed 2003·Granted Jun 20, 2006·17 cites·2 claims
- 0870US5315758AMethod for manufacturing slide electrical contactALPS ELECTRIC CO LTD·Filed 1993·Granted May 31, 1994·21 cites·4 claims
- 0967US6396386B2Angle sensor which makes it possible to prevent rattling caused by backlash between gears inside the angle sensorALPS ELECTRIC CO LTD·Filed 2000·Granted May 28, 2002·7 cites·9 claims
- 1067US2025147076A1Current Sensor And Current Control SystemALPS ALPINE CO LTD·Filed 2025·Application pending·0 cites
- 1163US6484119B1Input device having deflection detecting elementsALPS ELECTRIC CO LTD·Filed 2001·Granted Nov 19, 2002·12 cites·13 claims
- 1259US6539329B2Apparatus for detecting rotational angle by employing two or more detection signals based on rotational angle and rotational direction of rotating memberALPS ELECTRIC CO LTD·Filed 2001·Granted Mar 25, 2003·12 cites·4 claims
- 1358US5345215AVariable resistor device with reduced slider vibrationALPS ELECTRIC CO LTD·Filed 1993·Granted Sep 6, 1994·16 cites·6 claims
- 1457US6456065B2Device for detecting the rotational angle of a rotary memberALPS ELECTRIC CO LTD·Filed 2000·Granted Sep 24, 2002·7 cites·4 claims
- 1556US6809513B2Rotary position sensor having waterproof, explosion-protective structureALPS ELECTRIC CO LTD·Filed 2003·Granted Oct 26, 2004·8 cites·5 claims
- 1652US7521924B2Member position detection apparatus not affected by external magnetic fieldALPS ELECTRIC CO LTD·Filed 2004·Granted Apr 21, 2009·11 cites·7 claims
- 1751US6603305B2Rotary encoder having code member rotating along accurate circle as shaft rotatesALPS ELECTRIC CO LTD·Filed 2001·Granted Aug 5, 2003·5 cites·3 claims
- 1849US6784774B1Magnetic switch capable of performing normal detection for a long period of timeALPS ELECTRIC CO LTD·Filed 2004·Granted Aug 31, 2004·8 cites·5 claims
- 1947US6474146B2Rotary sensor capable of high-precision detection of rotation angle transmitted from outsideALPS ELECTRIC CO LTD·Filed 1999·Granted Nov 5, 2002·11 cites·9 claims
- 2045US6687647B2Rotation-angle detecting device capable of precisely detecting absolute angleALPS ELECTRIC CO LTD·Filed 2003·Granted Feb 3, 2004·4 cites·4 claims
- 2144US7045998B2Rotation detecting deviceNSK STEERING SYS CO LTD·Filed 2003·Granted May 16, 2006·2 cites·2 claims
- 2244US6386020B1Rotary sensor capable of high-precision detection of rotation angle transmitted from outsideALPS ELECTRIC CO LTD·Filed 1999·Granted May 14, 2002·9 cites·6 claims
- 2342US6507270B2Linear operation type electric partALPS ELECTRIC CO LTD·Filed 2001·Granted Jan 14, 2003·3 cites·9 claims
- 2442US6445278B1Rotary sensor capable of detecting rotation angle of shaft to be detected with high accuracyALPS ELECTRIC CO LTD·Filed 1999·Granted Sep 3, 2002·8 cites·13 claims
- 2539US6359432B1Connector and turning angle sensor using sameALPS ELECTRIC CO LTD·Filed 1999·Granted Mar 19, 2002·9 cites·12 claims
- 2638US9915710B2Magnetic sensor, method of manufacturing magnetic sensor, and method of designing magnetic sensorALPS ELECTRIC CO LTD·Filed 2016·Granted Mar 13, 2018·0 cites·7 claims
- 2733US2012191406A1Angular speed detection apparatus and method for detecting angular speed errorOKUMURA HIROFUMI·Filed 2012·Application pending·0 cites
- 2833US2003167858A1Rotary sensor of simple construction for detecting angle of rotation transmitted from outsideALPS ELECTRIC CO LTD·Filed 2003·Application pending·0 cites
- 2933US2003227369A1Rotary sensor with high reliability in contact between terminals and electrodesALPS ELECTRIC CO LTD·Filed 2003·Application pending·0 cites
- 3032US2016341802A1Magnetic sensorALPS ELECTRIC CO LTD·Filed 2016·Application pending·0 cites
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