Inventor

Keiji Ohtaka

Inventor

Tokyo, JP

Overview

1983–2007

Patent span

Physics

Primary field (CPC G)

Patents· 69 as inventor

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

G02Bprimary

G02BOptical elements, systems or apparatus70%

G03BApparatus or arrangements for taking photographs or for projecting or viewing them15%

C03CChemical composition of glasses, glazes or vitreous enamels2%

H04NPictorial communication, e.g. television2%

H10FInorganic semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation2%

H10WGeneric packages, interconnections, connectors or other constructional details of devices covered by class h102%

C08LCompositions of macromolecular compounds1%

C09DCoating compositions, e.g. paints, varnishes or lacquers1%

C09KMaterials for miscellaneous applications, not provided for elsewhere1%

G03FPhotomechanical production of textured or patterned surfaces, e.g. for printing, for processing of semiconductor devices1%

PatentTitleYear

7,301,700'Polarization beam splitter and optical system using the same, and image displaying apparatus, using the same'2007 7,236,655'Polarization element and optical device using polarization element'2007 7,155,073'Polarization element and optical device using polarization element'2006 7,116,478'Polarization beam splitter and optical system using the same, and image displaying apparatus, using the same'2006 7,071,985'Optical device and method for selecting object of focus'2006 6,831,706'Projection image display apparatus'2004 6,594,085'Image display apparatus and optical system'2003 6,577,344'Focus state detection apparatus with image sensing device controls'2003 6,506,446'Anti-fog coating material and method of preparing an anti-fog article'2003 6,327,430'Camera having antifogging film'2001 6,306,932'Anti-fogging coating material, anti-fogging coating film and anti-fogging article'2001 6,088,537'Focus detecting device'2000 6,055,376'Observation optical system and optical apparatus having the same'2000 6,014,524'Camera with visual axis detecting device'2000 5,912,504'Semiconductor photo-sensor and method for manufacturing the same'1999 5,864,721'Focus detecting apparatus'1999 5,839,001'Focus detecting apparatus'1998 5,797,049'Focus detection device for objective lens'1998 5,771,413'Focus detecting apparatus'1998 5,729,771'Focus detecting apparatus and optical apparatus using it'1998 5,583,076'Method for manufacturing a semiconductor photo-sensor'1996 5,486,892'Camera with visual axis detecting device'1996 5,459,551'Light emission device for focus detection having a chart and an illuminator'1995 5,262,819'Compact focus detecting device suitable for incorporation into an optical apparatus'1993 5,182,658'Image pickup apparatus for controlling accumulation time in photoelectric elements'1993 5,109,154'Focus detection device having a plurality of means for forming light patterns provided at different distances from the optical axis'1992 5,053,803'Information display apparatus for camera'1991 5,005,041'Focus detecting apparatus having a plurality of focus detecting areas'1991 4,992,819'Focus detecting device having a plurality of detecting areas and camera provided with the same'1991 4,992,817'Focus detecting device switching between passive and active detection'1991 4,975,727'Focus detecting device'1990 4,959,677'Device for detecting the focus adjusted state of an objecting lens'1990 4,954,701'Focus detecting apparatus provided with a plurality of detecting fields'1990 4,922,282'Optical apparatus for leading light fluxes transmitted through light dividing surface which is obliquely provided to focus detecting apparatus'1990 4,914,282'Focus detection system employing multiple area light distribution sensors'1990 4,907,026'Light projection system for automatic focus detection'1990 4,878,078'Focus detecting device and method of making same'1989 4,859,842'Multi-directional focus state detection apparatus'1989 4,849,782'Focus detecting device'1989 4,841,326'Apparatus for detecting the focus adjusted state of an objective optical system'1989 4,833,313'Focus detecting apparatus having increased SNR by selectively varying or holding constant the number of signals from sensor arrays'1989 4,825,239'Distance detection method and apparatus'1989 4,812,869'Focus detecting apparatus'1989 4,801,963'Focus detecting system'1989 4,800,410'Focus detecting apparatus for selecting the operating process in conformity with the contrast of an object'1989 4,792,668'Apparatus for detecting focusing state of objective lens'1988 4,792,669'Focus detecting device having two selectively movable lenses'1988 4,777,506'Camera having an assembling adjusting device'1988 4,774,539'Camera having a focus detecting apparatus'1988 4,739,157'Method of detecting the correlation between signals with weighting'1988 4,728,785'Focus detecting device using adjustable inclined sensing means'1988 4,723,142'Focus detecting device'1988 4,717,819'Focus detecting device'1988 4,716,282'Focus state detection method and apparatus with selective statistical processing'1987 4,712,901'Sharp focus detecting device'1987 4,699,493'Focus detecting device'1987 4,698,492'Focus detector system with a distortion compensation mask'1987 4,688,920'Focus state detecting system'1987 4,670,645'Focus detecting device with shading reduction optical filter'1987 4,643,557'Exposure control apparatus'1987 4,634,255'Focus detection apparatus'1987 4,618,236'Focus detecting apparatus'1986 4,567,123'Diffusing plate'1986 4,555,169'Focus detecting device for a camera'1985 4,549,802'Focus detection apparatus'1985 4,534,637'Camera with active optical range finder'1985 4,443,088'Focusing screen'1984 4,427,265'Diffusion plate'1984 4,421,398'Focussing plate'1983

Career & activity timeline

Assembled from patent assignee/location history and declaration credentials.

1983–2007Patents assigned to CANON KK (68)· patent assignee history

1983–1999Based in Tokyo, JP· patent location history

1985–2007Based in Kanagawa, JP· patent location history

1990–2006Based in Yokohama, JP· patent location history

2001–2003Patents assigned to NAKATO LAB INC (2)· patent assignee history

2004Patents assigned to CANON KABUSHIKI KIASHA (1)· patent assignee history

Inventor activity

Assignee and location history derived from the patent record.

Assignees

Assignee	Patents	Span
CANON KK	68	1983–2007
NAKATO LAB INC	2	2001–2003
CANON KABUSHIKI KIASHA	1	2004

Locations

Location	Patents	Span
Tokyo, JP	37	1983–1999
Yokohama, JP	24	1990–2006
Kanagawa, JP	8	1985–2007