Inventor
NAKAI TAKEHIKO
JP44 patents
⚠️ This page may combine multiple inventors who share the name “NAKAI TAKEHIKO”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.
CANON KK
42 patentsUS6560019B2May 6, 2003
Diffractive optical element and optical system having the same
CANON KK98 citations98
US6486974B1Nov 26, 2002
Image reading device
CANON KK48 citations96
US6262846B1Jul 17, 2001
Diffractive optical element and optical system having the same
CANON KK59 citations96
US6094281AJul 25, 2000
Image reading device with offset faces for visible and non-visible light sensors
CANON KK62 citations96
US5503904AApr 2, 1996
Invisible information recorded medium
CANON KK67 citations96
US8009355B2Aug 30, 2011
Optical element having periodic structure and optical apparatus using the same
CANON KK21 citations93
US7075722B2Jul 11, 2006
Diffractive optical element and optical system having the same
CANON KK37 citations93
US6927915B2Aug 9, 2005
Diffractive optical element, and optical system and optical apparatus provided with the same
CANON KK45 citations93
US6873463B2Mar 29, 2005
Diffractive optical element and optical system having the same
CANON KK37 citations93
US6829093B1Dec 7, 2004
Diffraction optical element
CANON KK36 citations93
US6650477B2Nov 18, 2003
Diffractive optical element and optical apparatus having the same
CANON KK34 citations93
US6480332B1Nov 12, 2002
Diffractive optical element and optical system having the same
CANON KK28 citations93
US6330110B2Dec 11, 2001
Diffractive optical element and optical system having the same
CANON KK25 citations93
US6122104ASep 19, 2000
Diffractive optical element and optical system having the same
CANON KK39 citations93
US6051826AApr 18, 2000
Photosensor with filter for cutting off the input of invisible information
CANON KK40 citations93
US5763891AJun 9, 1998
Non-visualized information recording medium and apparatus for detecting the same
CANON KK34 citations93
US5724152AMar 3, 1998
Image reading apparatus and image processing apparatus for reading optical information of visible and non-visible light
CANON KK38 citations93
US5650863AJul 22, 1997
Image reading and copying using plural illumination sources having different characteristics
CANON KK43 citations93
US5631723AMay 20, 1997
Image processing apparatus for determining whether an image contains a particular pattern using invisible light
CANON KK18 citations93
US5617187AApr 1, 1997
Image reading apparatus, copying apparatus, image processing apparatus, and image processing method
CANON KK24 citations93
US5481334AJan 2, 1996
Image processing apparatus having means for detecting non-visible light, and image processing method therefor
CANON KK28 citations93
US5471281ANov 28, 1995
Image reading apparatus and copying apparatus having means for radiating visible and non-visible light, image processing apparatus having means for discriminating a specific orginal and image processing method therefor
CANON KK39 citations93
US6624943B2Sep 23, 2003
Diffractive optical element and optical system having the same
CANON KK52 citations92
US6201616B1Mar 13, 2001
Method and apparatus for determining a predetermined pattern on an original based on visible and invisible information on the original
CANON KK27 citations92
US6078682AJun 20, 2000
Image processing apparatus and method, and image reading apparatus
CANON KK24 citations92
US5737113AApr 7, 1998
Optical modulators and color image display device employing the same
CANON KK38 citations92
US5362957ANov 8, 1994
Image reading apparatus
CANON KK21 citations92
US5113067AMay 12, 1992
Image reading apparatus having a blazed diffraction grating
CANON KK31 citations92
US7236302B2Jun 26, 2007
Diffraction optical element
CANON KK10 citations84
US6760159B2Jul 6, 2004
Diffractive optical element and optical system having the same
CANON KK15 citations84
US6590708B2Jul 8, 2003
Lens system having diffracting surface and refracting surface and optical apparatus using the lens system
CANON KK16 citations84
US6587272B2Jul 1, 2003
Diffractive optical element
CANON KK17 citations84
US7301702B2Nov 27, 2007
Diffractive optical element and optical system including the same
CANON KK7 citations74
US6757104B2Jun 29, 2004
Picture taking apparatus having diffractive optical element
CANON KK8 citations74
US6507437B1Jan 14, 2003
Diffractive optical element and photographic optical system having the same
CANON KK10 citations74
US6153879ANov 28, 2000
Invisible information detecting apparatus
CANON KK13 citations74
US5187606AFeb 16, 1993
Scanning optical apparatus
CANON KK10 citations74
US7554735B2Jun 30, 2009
Diffractive optical element and optical system including the same
CANON KK1 citations63
US6930833B2Aug 16, 2005
Diffractive optical element, and optical system and optical apparatus provide with the same
CANON KK5 citations63
US6028705AFeb 22, 2000
Image reading apparatus with reflection type blazed diffraction grating for color separation
CANON KK5 citations63
US7626772B2Dec 1, 2009
Optical system and optical apparatus having the same
CANON KK1 citations52
US6565212B2May 20, 2003
Projection display apparatus, and information processing system and image recording/reproducing system using the same
CANON KK1 citations52