Inventor · disambiguated record
Keiji Ohtaka
Also filed as: OHTAKA KEIJI
69 granted patents·1,567 citations·filing 1981–2006
99Inventor score
Top patents by PatentIndex Score
69 records- 0198US4427265ADiffusion plateCANON KK·Filed 1981·Granted Jan 24, 1984·73 cites·4 claims
- 0295US5486892ACamera with visual axis detecting deviceCANON KK·Filed 1994·Granted Jan 23, 1996·49 cites·39 claims
- 0395US4534637ACamera with active optical range finderCANON KK·Filed 1984·Granted Aug 13, 1985·99 cites·12 claims
- 0492US7236655B2Polarization element and optical device using polarization elementCANON KK·Filed 2006·Granted Jun 26, 2007·24 cites·8 claims
- 0592US5053803AInformation display apparatus for cameraCANON KK·Filed 1990·Granted Oct 1, 1991·39 cites·6 claims
- 0692US4421398AFocussing plateCANON KK·Filed 1983·Granted Dec 20, 1983·29 cites·16 claims
- 0790US7155073B2Polarization element and optical device using polarization elementCANON KK·Filed 2005·Granted Dec 26, 2006·20 cites·16 claims
- 0890US7116478B2Polarization beam splitter and optical system using the same, and image displaying apparatus, using the sameCANON KK·Filed 2004·Granted Oct 3, 2006·39 cites·4 claims
- 0990US4643557AExposure control apparatusCANON KK·Filed 1985·Granted Feb 17, 1987·29 cites·5 claims
- 1089US4849782AFocus detecting deviceCANON KK·Filed 1986·Granted Jul 18, 1989·67 cites·10 claims
- 1187US6014524ACamera with visual axis detecting deviceCANON KK·Filed 1994·Granted Jan 11, 2000·24 cites·30 claims
- 1285US4859842AMulti-directional focus state detection apparatusCANON KK·Filed 1989·Granted Aug 22, 1989·54 cites·34 claims
- 1385US4567123ADiffusing plateCANON KK·Filed 1985·Granted Jan 28, 1986·39 cites·3 claims
- 1480US6506446B2Anti-fog coating material and method of preparing an anti-fog articleCANON KK·Filed 2001·Granted Jan 14, 2003·23 cites·10 claims
- 1578US4954701AFocus detecting apparatus provided with a plurality of detecting fieldsCANON KK·Filed 1988·Granted Sep 4, 1990·36 cites·6 claims
- 1678US4774539ACamera having a focus detecting apparatusCANON KK·Filed 1987·Granted Sep 27, 1988·38 cites·16 claims
- 1776US4992817AFocus detecting device switching between passive and active detectionCANON KK·Filed 1989·Granted Feb 12, 1991·36 cites·15 claims
- 1876US4812869AFocus detecting apparatusCANON KK·Filed 1987·Granted Mar 14, 1989·35 cites·3 claims
- 1971US6594085B2Image display apparatus and optical systemCANON KK·Filed 2001·Granted Jul 15, 2003·13 cites·23 claims
- 2071US4728785AFocus detecting device using adjustable inclined sensing meansCANON KK·Filed 1986·Granted Mar 1, 1988·28 cites·7 claims
- 2170US5182658AImage pickup apparatus for controlling accumulation time in photoelectric elementsCANON KK·Filed 1991·Granted Jan 26, 1993·30 cites·12 claims
- 2270US5005041AFocus detecting apparatus having a plurality of focus detecting areasCANON KK·Filed 1988·Granted Apr 2, 1991·27 cites·10 claims
- 2370US4992819AFocus detecting device having a plurality of detecting areas and camera provided with the sameCANON KK·Filed 1989·Granted Feb 12, 1991·26 cites·18 claims
- 2470US4670645AFocus detecting device with shading reduction optical filterCANON KK·Filed 1984·Granted Jun 2, 1987·22 cites·8 claims
- 2570US4555169AFocus detecting device for a cameraCANON KK·Filed 1984·Granted Nov 26, 1985·23 cites·24 claims
- 2669US6831706B2Projection image display apparatusCANON KABUSHIKI KIASHA·Filed 2002·Granted Dec 14, 2004·9 cites·35 claims
- 2768US4914282AFocus detection system employing multiple area light distribution sensorsCANON KK·Filed 1989·Granted Apr 3, 1990·26 cites·21 claims
- 2865US4698492AFocus detector system with a distortion compensation maskCANON KK·Filed 1985·Granted Oct 6, 1987·23 cites·4 claims
- 2964US6088537AFocus detecting deviceCANON KK·Filed 1998·Granted Jul 11, 2000·26 cites·38 claims
- 3064US4618236AFocus detecting apparatusCANON KK·Filed 1984·Granted Oct 21, 1986·18 cites·3 claims
- 3163US5583076AMethod for manufacturing a semiconductor photo-sensorCANON KK·Filed 1995·Granted Dec 10, 1996·27 cites·7 claims
- 3262US7301700B2Polarization beam splitter and optical system using the same, and image displaying apparatus, using the sameCANON KK·Filed 2006·Granted Nov 27, 2007·2 cites·17 claims
- 3362US6327430B1Camera having antifogging filmCANON KK·Filed 1999·Granted Dec 4, 2001·7 cites·16 claims
- 3462US6306932B1Anti-fogging coating material, anti-fogging coating film and anti-fogging articleCANON KK·Filed 1998·Granted Oct 23, 2001·20 cites·14 claims
- 3562US4801963AFocus detecting systemCANON KK·Filed 1986·Granted Jan 31, 1989·20 cites·27 claims
- 3662US4792668AApparatus for detecting focusing state of objective lensCANON KK·Filed 1986·Granted Dec 20, 1988·21 cites·10 claims
- 3762US4634255AFocus detection apparatusCANON KK·Filed 1985·Granted Jan 6, 1987·21 cites·14 claims
- 3861US4959677ADevice for detecting the focus adjusted state of an objecting lensCANON KK·Filed 1989·Granted Sep 25, 1990·20 cites·10 claims
- 3961US4712901ASharp focus detecting deviceCANON KK·Filed 1985·Granted Dec 15, 1987·8 cites·6 claims
- 4060US7071985B1Optical device and method for selecting object of focusCANON KK·Filed 1998·Granted Jul 4, 2006·22 cites·27 claims
- 4159US4825239ADistance detection method and apparatusCANON KK·Filed 1988·Granted Apr 25, 1989·18 cites·14 claims
- 4258US5864721AFocus detecting apparatusCANON KK·Filed 1997·Granted Jan 26, 1999·21 cites·16 claims
- 4358US5839001AFocus detecting apparatusCANON KK·Filed 1996·Granted Nov 17, 1998·21 cites·7 claims
- 4457US6577344B2Focus state detection apparatus with image sensing device controlsCANON KK·Filed 1997·Granted Jun 10, 2003·20 cites·59 claims
- 4557US4777506ACamera having an assembling adjusting deviceCANON KK·Filed 1987·Granted Oct 11, 1988·17 cites·13 claims
- 4656US4699493AFocus detecting deviceCANON KK·Filed 1986·Granted Oct 13, 1987·17 cites·7 claims
- 4755US5912504ASemiconductor photo-sensor and method for manufacturing the sameCANON KK·Filed 1998·Granted Jun 15, 1999·18 cites·12 claims
- 4855US5262819ACompact focus detecting device suitable for incorporation into an optical apparatusCANON KK·Filed 1992·Granted Nov 16, 1993·18 cites·16 claims
- 4955US4841326AApparatus for detecting the focus adjusted state of an objective optical systemCANON KK·Filed 1987·Granted Jun 20, 1989·16 cites·13 claims
- 5055US4792669AFocus detecting device having two selectively movable lensesCANON KK·Filed 1986·Granted Dec 20, 1988·16 cites·9 claims
Showing the top 50 of 69 patent records by PatentIndex Score.
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Identity basis: PatentsView inventor disambiguation (2025Q4-odp release). How scoring works →