Seiji Yonezawa

Person

Hachioji, Tokyo, JP

People

Patents Grantslast 30 patents

Information Patent Grant
Optical reproduction method and optical information device
- Patent number 6,614,737
- Issue date Sep 2, 2003
- Hitachi, Ltd.
- Harukazu Miyamoto
- G11 - INFORMATION STORAGE
Information Patent Grant
Optical reproduction method and optical information device
- Patent number 6,442,120
- Issue date Aug 27, 2002
- Hitachi, Ltd.
- Harukazu Miyamoto
- G11 - INFORMATION STORAGE
Information Patent Grant
Optical reproduction method and optical information apparatus
- Patent number 6,205,098
- Issue date Mar 20, 2001
- Hitachi, Ltd.
- Harukazu Miyamoto
- G11 - INFORMATION STORAGE
Information Patent Grant
Magneto-optically recorded data readout system
- Patent number 6,122,229
- Issue date Sep 19, 2000
- Yonezawa; Seiji
- Seiji Yonezawa
- G11 - INFORMATION STORAGE
Information Patent Grant
Information recording medium with clock information therein
- Patent number 5,959,943
- Issue date Sep 28, 1999
- Hitachi, Ltd.
- Seiji Yonezawa
- G11 - INFORMATION STORAGE
Information Patent Grant
Information recording apparatus and method for modulated magneto-op...
- Patent number 5,886,958
- Issue date Mar 23, 1999
- Hitachi, Ltd.
- Seiji Yonezawa
- G11 - INFORMATION STORAGE
Information Patent Grant
Magneto optical recording medium apparatus and method utilizing lig...
- Patent number 5,726,955
- Issue date Mar 10, 1998
- Hitachi, Ltd.
- Seiji Yonezawa
- G11 - INFORMATION STORAGE
Information Patent Grant
Magneto-optical data recording apparatus using a sample-servo syste...
- Patent number 5,579,292
- Issue date Nov 26, 1996
- Hitachi, Ltd.
- Seiji Yonezawa
- G11 - INFORMATION STORAGE
Information Patent Grant
Data storage disk having improved tracking capability
- Patent number 5,537,282
- Issue date Jul 16, 1996
- David Treves
- G11 - INFORMATION STORAGE
Information Patent Grant
Magneto-optical data recording system continuously irradiating opti...
- Patent number 5,473,581
- Issue date Dec 5, 1995
- Hitachi, Ltd.
- Seiji Yonezawa
- G11 - INFORMATION STORAGE
Information Patent Grant
Projection exposure apparatus and pattern forming method for use th...
- Patent number 5,348,837
- Issue date Sep 20, 1994
- Hitachi, Ltd.
- Hiroshi Fukuda
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Method of magnetically recording and reading data, magnetic recordi...
- Patent number 5,296,995
- Issue date Mar 22, 1994
- Hitachi, Ltd.
- Seiji Yonezawa
- B82 - NANO-TECHNOLOGY
Information Patent Grant
Magneto-optical data recording system
- Patent number 5,170,383
- Issue date Dec 8, 1992
- Hitachi, Ltd.
- Seiji Yonezawa
- G11 - INFORMATION STORAGE
Information Patent Grant
Optical disk medium and its application method and system
- Patent number 5,150,339
- Issue date Sep 22, 1992
- Hitachi, Ltd.
- Hirotada Ueda
- G09 - EDUCATION CRYPTOGRAPHY DISPLAY ADVERTISING SEALS
Information Patent Grant
Optical device for generating pattern having uniform light intensit...
- Patent number 5,134,426
- Issue date Jul 28, 1992
- Hitachi, Ltd.
- Keiji Kataoka
- G02 - OPTICS
Information Patent Grant
Method and associated apparatus and medium for optical recording an...
- Patent number 4,949,325
- Issue date Aug 14, 1990
- Hitachi, Ltd.
- Toshiaki Tsuyoshi
- G11 - INFORMATION STORAGE
Information Patent Grant
Light spot position control system and method by sampled servo
- Patent number 4,872,152
- Issue date Oct 3, 1989
- Hitachi, Ltd.
- Toshiaki Tsuyoshi
- G11 - INFORMATION STORAGE
Information Patent Grant
Composite tracking servo system for optical disc apparatus with tra...
- Patent number 4,866,688
- Issue date Sep 12, 1989
- Hitachi, Ltd.
- Masatoshi Ohtake
- G11 - INFORMATION STORAGE
Information Patent Grant
Optical projection printing apparatus wherein wafer mark has a grat...
- Patent number 4,857,744
- Issue date Aug 15, 1989
- Hitachi, Ltd.
- Keiji Kataoka
- G03 - PHOTOGRAPHY CINEMATOGRAPHY ELECTROGRAPHY HOLOGRAPHY
Information Patent Grant
Optical information recording and reproducing apparatus with tracki...
- Patent number 4,847,822
- Issue date Jul 11, 1989
- Hitachi, Ltd.
- Wasao Takasugi
- G11 - INFORMATION STORAGE
Information Patent Grant
Wobbled pit recording method and device of optical recording medium...
- Patent number 4,791,627
- Issue date Dec 13, 1988
- Hitachi, Ltd.
- Seiji Yonezawa
- G11 - INFORMATION STORAGE
Information Patent Grant
Light spot position control system and method by sampling servo
- Patent number 4,785,442
- Issue date Nov 15, 1988
- Hitachi, Ltd.
- Masatoshi Ohtake
- G11 - INFORMATION STORAGE
Information Patent Grant
Wavelength scanning interferometry and interferometer employing las...
- Patent number 4,759,628
- Issue date Jul 26, 1988
- Hitachi, Ltd.
- Kimio Tatsuno
- G01 - MEASURING TESTING
Information Patent Grant
Information recording medium and method for reproducing the same
- Patent number 4,748,611
- Issue date May 31, 1988
- Hitachi, Ltd.
- Toshiaki Tsuyoshi
- G11 - INFORMATION STORAGE
Information Patent Grant
Method and apparatus for composite tracking servo system with track...
- Patent number 4,748,609
- Issue date May 31, 1988
- Hitachi, Ltd.
- Seiji Yonezawa
- G11 - INFORMATION STORAGE
Information Patent Grant
Phase compensation apparatus for an optical information recording a...
- Patent number 4,710,909
- Issue date Dec 1, 1987
- Hitachi, Ltd.
- Toshiaki Tsuyoshi
- G11 - INFORMATION STORAGE
Information Patent Grant
Method and apparatus for composite wobbled and push-pull tracking s...
- Patent number 4,707,816
- Issue date Nov 17, 1987
- Hitachi, Ltd.
- Seiji Yonezawa
- G11 - INFORMATION STORAGE
Information Patent Grant
Apparatus and record carrier for optically writing information
- Patent number 4,703,408
- Issue date Oct 27, 1987
- Hitachi, Ltd.
- Seiji Yonezawa
- G11 - INFORMATION STORAGE
Information Patent Grant
Hologram lens
- Patent number 4,688,880
- Issue date Aug 25, 1987
- Hitachi, Ltd.
- Kimio Tatsuno
- G02 - OPTICS
Information Patent Grant
Optical disk cutting apparatus using multiple beams
- Patent number 4,646,279
- Issue date Feb 24, 1987
- Hitachi, Ltd.
- Seiji Yonezawa
- G11 - INFORMATION STORAGE

Patents Applicationslast 30 patents

Information Patent Application
Optical reproduction method and optical information device
- Publication number 20020071361
- Publication date Jun 13, 2002
- Harukazu Miyamoto
- G11 - INFORMATION STORAGE
Information Patent Application
Optical reproduction method and optical information device
- Publication number 20010001604
- Publication date May 24, 2001
- Harukazu Miyamoto
- G11 - INFORMATION STORAGE

Seiji Yonezawa

Person

Patents Grantslast 30 patents

Optical reproduction method and optical information device

Optical reproduction method and optical information device

Optical reproduction method and optical information apparatus

Magneto-optically recorded data readout system

Information recording medium with clock information therein

Information recording apparatus and method for modulated magneto-op...

Magneto optical recording medium apparatus and method utilizing lig...

Magneto-optical data recording apparatus using a sample-servo syste...

Data storage disk having improved tracking capability

Magneto-optical data recording system continuously irradiating opti...

Projection exposure apparatus and pattern forming method for use th...

Method of magnetically recording and reading data, magnetic recordi...

Magneto-optical data recording system

Optical disk medium and its application method and system

Optical device for generating pattern having uniform light intensit...

Method and associated apparatus and medium for optical recording an...

Light spot position control system and method by sampled servo

Composite tracking servo system for optical disc apparatus with tra...

Optical projection printing apparatus wherein wafer mark has a grat...

Optical information recording and reproducing apparatus with tracki...

Wobbled pit recording method and device of optical recording medium...

Light spot position control system and method by sampling servo

Wavelength scanning interferometry and interferometer employing las...

Information recording medium and method for reproducing the same

Method and apparatus for composite tracking servo system with track...

Phase compensation apparatus for an optical information recording a...

Method and apparatus for composite wobbled and push-pull tracking s...

Apparatus and record carrier for optically writing information

Hologram lens

Optical disk cutting apparatus using multiple beams

Patents Applicationslast 30 patents

Optical reproduction method and optical information device

Optical reproduction method and optical information device