Inventor

Masayuki Usui

Inventor

Yokohama, JP

Overview

1987–2011

Patent span

Physics

Primary field (CPC G)

Patents· 24 as inventor

Public. Assignee & technology derived from the patent record. Each patent links to its LexDana page.

G11Bprimary

G11BInformation storage based on relative movement between record carrier and transducer38%

G02BOptical elements, systems or apparatus22%

G06KGraphical data reading16%

G02FOptical devices or arrangements for the control of light by modification of the optical properties of the media of the elements involved therein8%

B29CShaping or joining of plastics3%

B29DProducing particular articles from plastics or from substances in a plastic state3%

B29KIndexing scheme associated with subclasses b29b, b29c or b29d, relating to moulding materials or to materials for moulds, reinforcements, fillers or preformed parts, e.g. inserts3%

C09KMaterials for miscellaneous applications, not provided for elsewhere3%

H01JElectric discharge tubes or discharge lamps3%

H04NPictorial communication, e.g. television3%

PatentTitleYear

7,995,309'Magnetic recording medium, magnetic signal reproduction method and magnetic signal reproduction system'2011 5,861,713'Low voltage electron beam display apparatus having brightness increased by reducing an oxide inevitably formed on a surface of an oxisulfide phosphor on manufacture'1999 5,532,990'Optical information processing method and apparatus including measuring and correcting the offset of a tracking error signal from an output of a photodetector using a vibrating objective lens'1996 5,517,475'Optical information processing apparatus in which the offset of a tracking error signal is corrected in accordance with a relationship stored in a memory, in response to a position detection output signal'1996 5,404,346'Optical information processing apparatus including a correction circuit for correcting non-linearity of an output of a position detection circuit'1995 5,347,503'Optical information processing apparatus for correcting linearity of a photosensor output with respect to power of an emitted light beam'1994 5,247,505'Information recording method for reciprocally recording and verifying information'1993 5,195,081'Optical apparatus for effecting recording and/or reproducing of information on/from and optical information recording medium'1993 5,119,356'Information recording and reproducing apparatus including detection of whether an information recording medium has been normally loaded into the apparatus'1992 5,018,123'Optical information recording medium and method for recording information on said medium and reproducing information therefrom'1991 5,010,534'Optical information recording-reproducing apparatus'1991 4,922,351'Optical information recording and reproducing apparatus'1990 4,912,697'Apparatus and method for preventing recording errors due to a reduction in the relative speed between an information carrying light beam and a recording medium'1990 4,872,743'Varifocal optical element'1989 4,865,426'Variable aberration imaging optical system'1989 4,848,879'Light modulating device'1989 4,787,075'Optical information recording medium and apparatus for recording/reproducing information using the same'1988 4,783,155'Optical device with variably shaped optical surface and a method for varying the focal length'1988 4,783,141'Array lens'1988 4,781,445'Optical device having positionally changeable optical surfaces and a method of varying an image forming position'1988 4,729,641'Functional optical element having a non-flat planar interface with variable-index medium'1988 4,714,326'Method and element for optical modulation'1987 4,712,882'Variable focal length lens'1987 4,641,920'Optical element having the function of changing the cross-sectional intensity distribution of a light beam'1987

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1987–1996Patents assigned to CANON KK (22)· patent assignee history

1987–1996Based in Yokohama, JP· patent location history

1999Patents assigned to NEC CORP (1)· patent assignee history

1999Patents assigned to NICHIA KAGAKU KOGYO KK (1)· patent assignee history

1999Based in Kagoshima, JP· patent location history

2011Patents assigned to FUJIFILM CORP (1)· patent assignee history

2011Based in Kanagawa, JP· patent location history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
CANON KK	22	1987–1996
FUJIFILM CORP	1	2011
NEC CORP	1	1999
NICHIA KAGAKU KOGYO KK	1	1999

Locations

Location	Patents	Span
Yokohama, JP	22	1987–1996
Kanagawa, JP	1	2011
Kagoshima, JP	1	1999