Inventor · disambiguated record
Koh Ishizuka
Also filed as: ISHIZUKA KOH
43 granted patents·1,351 citations·filing 1988–2001
99Inventor score
Files withCANON KK43
Top patents by PatentIndex Score
43 records- 0195US5283434ADisplacement detecting device with integral opticsCANON KK·Filed 1992·Granted Feb 1, 1994·92 cites·14 claims
- 0294US5129725AMethod of optically detecting position of object and position detecting apparatus using the methodCANON KK·Filed 1991·Granted Jul 14, 1992·123 cites·11 claims
- 0393US5021649ARelief diffraction grating encoderCANON KK·Filed 1990·Granted Jun 4, 1991·81 cites·12 claims
- 0492US5066130ADisplacement measuring apparatusCANON KK·Filed 1989·Granted Nov 19, 1991·57 cites·31 claims
- 0589US4930895AEncoder for forming interference fringes by re-diffracted lights from an optical type scale and photoelectrically converting the interference fringes to thereby detect the displacement of the scaleCANON KK·Filed 1988·Granted Jun 5, 1990·48 cites·34 claims
- 0688US4979826ADisplacement measuring apparatusCANON KK·Filed 1989·Granted Dec 25, 1990·44 cites·22 claims
- 0785US5621527AApparatus for measuring relative displacement between the apparatus and a scale which a grating is formedCANON KK·Filed 1994·Granted Apr 15, 1997·47 cites·20 claims
- 0884US6229140B1Displacement information detection apparatusCANON KK·Filed 1996·Granted May 8, 2001·46 cites·21 claims
- 0982US5569913AOptical displacement sensorCANON KK·Filed 1995·Granted Oct 29, 1996·49 cites·8 claims
- 1082US5498870ARotation information detection apparatusCANON KK·Filed 1995·Granted Mar 12, 1996·48 cites·11 claims
- 1180US5390022ADisplacement information detection apparatus for receiving a divergent light beamCANON KK·Filed 1993·Granted Feb 14, 1995·36 cites·25 claims
- 1279US5680211AApparatus for optically detecting displacement of an object using a synthesizing means utilizing a substrate with two diffraction gratings thereonCANON KK·Filed 1995·Granted Oct 21, 1997·41 cites·23 claims
- 1379US5483377ADisplacement detection apparatusCANON KK·Filed 1993·Granted Jan 9, 1996·33 cites·15 claims
- 1479US4970388AEncoder with diffraction grating and multiply diffracted lightCANON KK·Filed 1989·Granted Nov 13, 1990·28 cites·30 claims
- 1577US6617572B2Displacement information detection apparatusCANON KK·Filed 2001·Granted Sep 9, 2003·15 cites·2 claims
- 1677US5038032AEncoder incorporating a displaceable diffraction gratingCANON KK·Filed 1990·Granted Aug 6, 1991·33 cites·26 claims
- 1777US5000542AOptical type encoderCANON KK·Filed 1989·Granted Mar 19, 1991·26 cites·21 claims
- 1876US5557396AVelocity information detecting apparatusCANON KK·Filed 1994·Granted Sep 17, 1996·33 cites·19 claims
- 1976US5026985AMethod and apparatus for detecting a reference position of a rotating scale with two sensorsCANON KK·Filed 1989·Granted Jun 25, 1991·24 cites·30 claims
- 2074US5146085AEncoder with high resolving power and accuracyCANON KK·Filed 1990·Granted Sep 8, 1992·22 cites·10 claims
- 2173US5436724AApparatus for measuring relative movement using a diffraction grating having an orthogonally polarized input beamCANON KK·Filed 1992·Granted Jul 25, 1995·28 cites·10 claims
- 2273US5051579AOptical scale encoder with light intensity alarmCANON KK·Filed 1990·Granted Sep 24, 1991·29 cites·9 claims
- 2372US5537210ARotation detecting apparatus and scale having a multi helix diffraction grating for the sameCANON KK·Filed 1994·Granted Jul 16, 1996·27 cites·18 claims
- 2472US5059791AReference position detecting device utilizing a plurality of photo-detectors and an encoder using the deviceCANON KK·Filed 1990·Granted Oct 22, 1991·27 cites·48 claims
- 2571US5067089ADevice having signal interpolation circuit and displacement measuring apparatus comprising the deviceCANON KK·Filed 1989·Granted Nov 19, 1991·20 cites·20 claims
- 2669US5657125AApparatus including a light-detecting element having a photo-electric conversion surface and an integral light blocking memberCANON KK·Filed 1995·Granted Aug 12, 1997·27 cites·17 claims
- 2767US5568337AHead positioning using a disk drive mounted to a rotating tableCANON KK·Filed 1995·Granted Oct 22, 1996·22 cites·6 claims
- 2867US5101102ARotary encoder having a plurality of beams emitted by a diffraction gratingCANON KK·Filed 1990·Granted Mar 31, 1992·23 cites·14 claims
- 2964US5661296ARotary encoder measuring substantially coinciding phases of interference light componentsCANON KK·Filed 1996·Granted Aug 26, 1997·24 cites·20 claims
- 3061US5036192ARotary encoder using reflected lightCANON KK·Filed 1990·Granted Jul 30, 1991·19 cites·24 claims
- 3161US5017777ADiffracted beam encoderCANON KK·Filed 1989·Granted May 21, 1991·14 cites·34 claims
- 3261US4975570ARotary encoder using multiple diffracted beams having co-incident pathsCANON KK·Filed 1990·Granted Dec 4, 1990·18 cites·32 claims
- 3360US5438586AApparatus with light-emitting element and method for producing itCANON KK·Filed 1993·Granted Aug 1, 1995·27 cites·3 claims
- 3460US5159192AEncoder and scanning system using a scale having a non-uniform pitchCANON KK·Filed 1991·Granted Oct 27, 1992·17 cites·24 claims
- 3559US4933673AEncoderCANON KK·Filed 1988·Granted Jun 12, 1990·15 cites·5 claims
- 3657US5038491AScale for use for measurement of the displacement of an object to be examined, and displacement measuring apparatusCANON KK·Filed 1989·Granted Aug 13, 1991·12 cites·6 claims
- 3755US5302821AEncoder using a birefringent element and a system including the sameCANON KK·Filed 1992·Granted Apr 12, 1994·14 cites·16 claims
- 3854US4998798AEncoder having long length measuring strokeCANON KK·Filed 1989·Granted Mar 12, 1991·10 cites·15 claims
- 3952US5574559ADisplacement detection apparatus using multiple displacement detection signals formed by a multiple phase combination gratingCANON KK·Filed 1996·Granted Nov 12, 1996·14 cites·22 claims
- 4049US5404220AMeasuring method and measuring apparatus for determining the relative displacement of a diffraction grating with respect to a plurality of beamsCANON KK·Filed 1992·Granted Apr 4, 1995·11 cites·14 claims
- 4148US4912320AOptical type encoder including diffraction grating for producing interference fringes that are processed to measure displacementCANON KK·Filed 1989·Granted Mar 27, 1990·8 cites·7 claims
- 4246US5532819ARotary detector having an optical system for guiding two diffracted lightsCANON KK·Filed 1995·Granted Jul 2, 1996·11 cites·9 claims
- 4342US5126562AEncoder for setting optical path lengths of related beamsCANON KK·Filed 1990·Granted Jun 30, 1992·8 cites·11 claims
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →