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Nikon - CCD tricks with mirrors.
http://patft.uspto.gov/netacgi/nph-P...&RS=PN/7138663
or http://tinyurl.com/2xextp This has been posted on DPReview. Interesting comments: "According to the second embodiment, as in the case of the first embodiment, since the red, blue, and green light passes through the same opening, the photon utilization efficiency of the light receiving element can be increased. In addition, the red, blue, and green light is in the same spatial position, so that false color does not appear." So, although photosite size is probably small, this is (at least partially) offset by not losing light through rgb filters. Patent was applied for in 2003. Canon also proposed a more conventional "foveon" type sensor in about 2000, but it hasn't eventuated in a (Canon) camera yet. |
#2
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Nikon - CCD tricks with mirrors.
frederick wrote:
http://patft.uspto.gov/netacgi/nph-P...&RS=PN/7138663 or http://tinyurl.com/2xextp This has been posted on DPReview. Reading the patent is an awkward way to figure out what they are talking about, has someone written an article about this thing in plain language? Also quicktime doesn't load the drawings properly, it would be helpful to see wtf this is. One thing I noticed is they talk about this Nikon invention being used in video cameras to avoid bayer filters not still cameras so I'm not sure it's relevant to still photography. I seem to recall this has been implemented in video cameras, though I'm certainly not sure, maybe that was something else. Interesting comments: "According to the second embodiment, as in the case of the first embodiment, since the red, blue, and green light passes through the same opening, the photon utilization efficiency of the light receiving element can be increased. In addition, the red, blue, and green light is in the same spatial position, so that false color does not appear." So, although photosite size is probably small, this is (at least partially) offset by not losing light through rgb filters. Patent was applied for in 2003. Canon also proposed a more conventional "foveon" type sensor in about 2000, but it hasn't eventuated in a (Canon) camera yet. -- Paul Furman Photography http://edgehill.net Bay Natives Nursery http://www.baynatives.com |
#3
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Nikon - CCD tricks with mirrors.
Paul Furman wrote:
frederick wrote: http://patft.uspto.gov/netacgi/nph-P...&RS=PN/7138663 or http://tinyurl.com/2xextp This has been posted on DPReview. Reading the patent is an awkward way to figure out what they are talking about, has someone written an article about this thing in plain language? Also quicktime doesn't load the drawings properly, it would be helpful to see wtf this is. There's some comment on and a link to drawing on DPreview site. http://www.dpreview.com/news/0708/nikonsensortech.gif One thing I noticed is they talk about this Nikon invention being used in video cameras to avoid bayer filters not still cameras so I'm not sure it's relevant to still photography. I seem to recall this has been implemented in video cameras, though I'm certainly not sure, maybe that was something else. I think that the reference to video cameras was referring to use of 3CCD systems on video cameras. I haven't gone back and re-read the patent info but IIRC it refers to it as a related technology. Interesting comments: "According to the second embodiment, as in the case of the first embodiment, since the red, blue, and green light passes through the same opening, the photon utilization efficiency of the light receiving element can be increased. In addition, the red, blue, and green light is in the same spatial position, so that false color does not appear." So, although photosite size is probably small, this is (at least partially) offset by not losing light through rgb filters. Patent was applied for in 2003. Canon also proposed a more conventional "foveon" type sensor in about 2000, but it hasn't eventuated in a (Canon) camera yet. |
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Nikon - CCD tricks with mirrors.
On Aug 10, 4:10 am, frederick wrote:
There's some comment on and a link to drawing on DPreview site.http://www.dpreview.com/news/0708/nikonsensortech.gif But is it feasible to mass-produce such an arrangement of dichroic mirrors? Does anybody have any insight? |
#5
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Nikon - CCD tricks with mirrors.
frederick wrote:
Paul Furman wrote: frederick wrote: http://patft.uspto.gov/netacgi/nph-P...&RS=PN/7138663 or http://tinyurl.com/2xextp This has been posted on DPReview. Reading the patent is an awkward way to figure out what they are talking about, has someone written an article about this thing in plain language? Also quicktime doesn't load the drawings properly, it would be helpful to see wtf this is. There's some comment on and a link to drawing on DPreview site. http://www.dpreview.com/news/0708/nikonsensortech.gif Ah, OK, I get it. If that's an accurate diagram, it's an awful lot of empty silicon & awfully small pixels. I don't think it has any application in DSLRs. One thing I noticed is they talk about this Nikon invention being used in video cameras to avoid bayer filters not still cameras so I'm not sure it's relevant to still photography. I seem to recall this has been implemented in video cameras, though I'm certainly not sure, maybe that was something else. I think that the reference to video cameras was referring to use of 3CCD systems on video cameras. I haven't gone back and re-read the patent info but IIRC it refers to it as a related technology. 3CCD, ah there's a name I can search with! http://en.wikipedia.org/wiki/3CCD "Three-CCD cameras are generally more expensive than single-CCD cameras because they require three times as many elements to form the image detector, and because they require a precision color-separation beam-splitter optical assembly." This looks like a variation on that concept with mirrors instead of a prism. That link links to a Canon 3CCD camcorder for pro use (expensive). http://www.usa.canon.com/consumer/controller?act=ModelInfoAct&tabact=ModelFeaturesTa bAct&fcategoryid=165&modelid=7512&pageno=2 "The Canon GL2 has three CCDs, delivering outstanding picture quality, highly accurate color reproduction and a wide dynamic range with virtually no color noise. On top of that, Canon has improved a broadcast technology to create a new form of Pixel Shift, producing greater picture quality than that of camcorders using CCDs with almost twice the number of pixels. Pixel Shift In the GL2, Canon uses Pixel Shift, a signal processing method used in broadcast TV cameras, to exceed the overall picture quality achieved by camcorders using nearly twice as many pixels. With the light coming into the camcorder split into three color components, each of the three CCDs then handles one of three primary colors: Red, Green and Blue. The green component of a video signal contains 60% of the picture detail, and the red and blue components only 40%. The green CCD in the GL2 is shifted the equivalent distance of 1/2 pixel from the red and blue CCD. The green signal is then sampled more frequently to extract the maximum picture detail from the video signal. In addition to outstanding clarity and natural color, Pixel Shift provides wider dynamic range, reduced vertical smear from bright light sources and sharper still images. Super High Resolution and Super Low Light There are 410,000 pixels on each of the three CCD image sensors in the GL2. With the new Pixel Shift technology, the GL2 rivals the resolution of camcorders using CCDs with 680,000 pixels." Interesting comments: "According to the second embodiment, as in the case of the first embodiment, since the red, blue, and green light passes through the same opening, the photon utilization efficiency of the light receiving element can be increased. In addition, the red, blue, and green light is in the same spatial position, so that false color does not appear." So, although photosite size is probably small, this is (at least partially) offset by not losing light through rgb filters. Patent was applied for in 2003. Canon also proposed a more conventional "foveon" type sensor in about 2000, but it hasn't eventuated in a (Canon) camera yet. -- Paul Furman Photography http://edgehill.net Bay Natives Nursery http://www.baynatives.com |
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