Inventor

NISHIMURA TETSUHARU

US39 patents

Patents

39 patents

US5129725AJul 14, 1992

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

CANON KK123 citations97

US5283434AFeb 1, 1994

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

US4868385ASep 19, 1989

Rotating state detection apparatus using a plurality of light beams

CANON KK51 citations93

US4829342AMay 9, 1989

Moving state detection apparatus

CANON KK37 citations93

US5568337AOct 22, 1996

Head positioning using a disk drive mounted to a rotating table

CANON KK22 citations91

US5067089ANov 19, 1991

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

CANON KK20 citations82

US4967072AOct 30, 1990

Interferometric rotating condition detection apparatus

CANON KK19 citations82

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

US5198873AMar 30, 1993

Encoder utilizing interference using multi-mode semiconductor laser

CANON KK16 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

US5067813ANov 26, 1991

Optical apparatus for measuring displacement of an object

CANON KK12 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

US4682237AJul 21, 1987

Photographic optical apparatus

CANON KK16 citations74

US4677489AJun 30, 1987

Image pickup apparatus

CANON KK17 citations74

US4609272ASep 2, 1986

Finder system of high image magnification

CANON KK7 citations74

US4592636AJun 3, 1986

View finder optical system

CANON KK17 citations74

NISHIMURA TETSUHARU

Patents

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

Displacement detecting device with integral optics

Displacement measuring apparatus

Relief diffraction grating encoder

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

Rotating state detection apparatus using a plurality of light beams

Moving state detection apparatus

Head positioning using a disk drive mounted to a rotating table

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

Interferometric rotating condition detection apparatus

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 utilizing interference using multi-mode semiconductor laser

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

Encoder for setting optical path lengths of related beams

Optical apparatus for measuring displacement of an object

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

Photographic optical apparatus

Image pickup apparatus

Finder system of high image magnification

View finder optical system