Inventor

ISHIZUKA KOH

JP43 patents

Patents

43 patents

US5129725AJul 14, 1992

Method of optically detecting position of object and position detecting apparatus using the method

CANON KK123 citations97

US6229140B1May 8, 2001

Apparatus for optically detecting displacement of an object using a synthesizing means utilizing a substrate with two diffraction gratings thereon

CANON KK41 citations93

US5661296AAug 26, 1997

Rotary encoder measuring substantially coinciding phases of interference light components

CANON KK24 citations93

US5657125AAug 12, 1997

Apparatus including a light-detecting element having a photo-electric conversion surface and an integral light blocking member

CANON KK27 citations93

US5621527AApr 15, 1997

Apparatus for measuring relative displacement between the apparatus and a scale which a grating is formed

CANON KK47 citations93

US5569913AOct 29, 1996

Optical displacement sensor

CANON KK49 citations93

US5557396ASep 17, 1996

Velocity information detecting apparatus

CANON KK33 citations93

US5498870AMar 12, 1996

Rotation information detection apparatus

CANON KK48 citations93

US5483377AJan 9, 1996

Displacement detection apparatus

CANON KK33 citations93

US5438586AAug 1, 1995

Apparatus with light-emitting element and method for producing it

CANON KK27 citations93

US5436724AJul 25, 1995

Apparatus for measuring relative movement using a diffraction grating having an orthogonally polarized input beam

CANON KK28 citations93

US5390022AFeb 14, 1995

Displacement information detection apparatus for receiving a divergent light beam

CANON KK36 citations93

US5146085ASep 8, 1992

Encoder with high resolving power and accuracy

CANON KK22 citations93

US5101102AMar 31, 1992

Rotary encoder having a plurality of beams emitted by a diffraction grating

CANON KK23 citations93

US5059791AOct 22, 1991

Reference position detecting device utilizing a plurality of photo-detectors and an encoder using the device

CANON KK27 citations93

US5051579ASep 24, 1991

Optical scale encoder with light intensity alarm

CANON KK29 citations93

US5038032AAug 6, 1991

Encoder incorporating a displaceable diffraction grating

CANON KK33 citations93

US5026985AJun 25, 1991

Method and apparatus for detecting a reference position of a rotating scale with two sensors

CANON KK24 citations93

US5000542AMar 19, 1991

Optical type encoder

CANON KK26 citations93

US4979826ADec 25, 1990

Displacement measuring apparatus

CANON KK44 citations93

US4970388ANov 13, 1990

Encoder with diffraction grating and multiply diffracted light

CANON KK28 citations93

US4930895AJun 5, 1990

Encoder 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 scale

CANON KK48 citations93

US5537210AJul 16, 1996

Rotation detecting apparatus and scale having a multi helix diffraction grating for the same

CANON KK27 citations92

US5568337AOct 22, 1996

Head positioning using a disk drive mounted to a rotating table

CANON KK22 citations91

US6617572B2Sep 9, 2003

Displacement information detection apparatus

CANON KK15 citations84

US5067089ANov 19, 1991

Device having signal interpolation circuit and displacement measuring apparatus comprising the device

CANON KK20 citations82

US5574559ANov 12, 1996

Displacement detection apparatus using multiple displacement detection signals formed by a multiple phase combination grating

CANON KK14 citations74

US5532819AJul 2, 1996

Rotary detector having an optical system for guiding two diffracted lights

CANON KK11 citations74

US5404220AApr 4, 1995

Measuring method and measuring apparatus for determining the relative displacement of a diffraction grating with respect to a plurality of beams

CANON KK11 citations74

US5302821AApr 12, 1994

Encoder using a birefringent element and a system including the same

CANON KK14 citations74

US5159192AOct 27, 1992

Encoder and scanning system using a scale having a non-uniform pitch

CANON KK17 citations74

US5126562AJun 30, 1992

Encoder for setting optical path lengths of related beams

CANON KK8 citations74

US5038491AAug 13, 1991

Scale for use for measurement of the displacement of an object to be examined, and displacement measuring apparatus

CANON KK12 citations74

US5036192AJul 30, 1991

Rotary encoder using reflected light

CANON KK19 citations74

US5017777AMay 21, 1991

Diffracted beam encoder

CANON KK14 citations74

US4998798AMar 12, 1991

Encoder having long length measuring stroke

CANON KK10 citations74

US4975570ADec 4, 1990

Rotary encoder using multiple diffracted beams having co-incident paths

CANON KK18 citations74

US4933673AJun 12, 1990

Encoder

CANON KK15 citations74

US4912320AMar 27, 1990

Optical type encoder including diffraction grating for producing interference fringes that are processed to measure displacement

CANON KK8 citations74

ISHIZUKA KOH

Patents

Method of optically detecting position of object and position detecting apparatus using the method

Displacement information detection apparatus

Displacement detecting device with integral optics

Displacement measuring apparatus

Relief diffraction grating encoder

Apparatus for optically detecting displacement of an object using a synthesizing means utilizing a substrate with two diffraction gratings thereon

Rotary encoder measuring substantially coinciding phases of interference light components

Apparatus including a light-detecting element having a photo-electric conversion surface and an integral light blocking member

Apparatus for measuring relative displacement between the apparatus and a scale which a grating is formed

Optical displacement sensor

Velocity information detecting apparatus

Rotation information detection apparatus

Displacement detection apparatus

Apparatus with light-emitting element and method for producing it

Apparatus for measuring relative movement using a diffraction grating having an orthogonally polarized input beam

Displacement information detection apparatus for receiving a divergent light beam

Encoder with high resolving power and accuracy

Rotary encoder having a plurality of beams emitted by a diffraction grating

Reference position detecting device utilizing a plurality of photo-detectors and an encoder using the device

Optical scale encoder with light intensity alarm

Encoder incorporating a displaceable diffraction grating

Method and apparatus for detecting a reference position of a rotating scale with two sensors

Optical type encoder

Displacement measuring apparatus

Encoder with diffraction grating and multiply diffracted light

Encoder 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 scale

Rotation detecting apparatus and scale having a multi helix diffraction grating for the same

Head positioning using a disk drive mounted to a rotating table

Displacement information detection apparatus

Device having signal interpolation circuit and displacement measuring apparatus comprising the device

Displacement detection apparatus using multiple displacement detection signals formed by a multiple phase combination grating

Rotary detector having an optical system for guiding two diffracted lights

Measuring method and measuring apparatus for determining the relative displacement of a diffraction grating with respect to a plurality of beams

Encoder using a birefringent element and a system including the same

Encoder and scanning system using a scale having a non-uniform pitch

Encoder for setting optical path lengths of related beams

Scale for use for measurement of the displacement of an object to be examined, and displacement measuring apparatus

Rotary encoder using reflected light

Diffracted beam encoder

Encoder having long length measuring stroke

Rotary encoder using multiple diffracted beams having co-incident paths

Encoder

Optical type encoder including diffraction grating for producing interference fringes that are processed to measure displacement