A patent showing a 5 layer image sensor from Canon has appeared. UV and IR layers help with color reproduction especially for skin tones.
Keith at Northlight has this to add about the patent: “The pixel structure above, shows a BSI design (back illumination), but obviously no pixel structure. Extending the range of light response to UV and IR would cause issues for current lens designs, but the idea of more than three colour primaries is not new, although it would require a major re-write for support from RAW converter software.”
Patent Information (Google Translated)
- Patent Publication No. 2014-103644
- Publication date 2014.6.5
- Filing date 2012.11.22
- Canon patents
- I get the visible light
- I get the ultraviolet light
- I get the infrared light
- I want to extract the skin area
- The skin region of visible light, I will correct the image from the difference of the skin area of ultraviolet light
- Signal value of the infrared light is regarded as the skin area, the high part
Source: [EG] via [NL]
We’re told by a new source that a new generation of full-frame CMOS sensors slated for both a forthcoming mirrorless camera as well as updated versions of the current range of prosumer DLSR models.
The new full frame sensors are said to have lower production costs. Yields have improved for these sensors when compared to their predecessors, and that has probably lead to the cost reduction in production. There was also a bit of information about the new sensors having Foveon like technology, we’ve asked for clarification on this.
New source, so a big grain of salt for this one is required.
Canon still working on Foveon Technology
Canon has been working on 3 layer Foveon sensor technology for a while now, it still hasn’t appeared in a camera and we haven’t heard anything to say it will. However, the fact they continue to spend resources on it, tells us there is definitely a good application for the technology.
Patent Publication No. 2013-93553 (Google Translated)
- Publication date 2013.5.16
- Filing date 2011.10.4
Imaging element of three-layer structure
- Photodiode deep layer (hereinafter, PD) in the charge is diffused into the substrate
- Thus sensitivity is poor red
- I as a photonic crystal of irregular shape, the boundary surface of the PD of red or green,
- In the periodic structure of uneven spacing, less than twice the 1/4 times or more the wavelength of light, or I shall be two times or less 1/2 times or more
- Irregular shape has the properties to be spatially-localized or resonant light
- The incident light is diffracted, it combines with the light of the boundary plane, the resonant
- Prolonged exists than normal, the light becomes easy to be absorbed by the PD Thus
A Canon Foveon Type Sensor?
3 Layer Image Sensor
A Canon patent was recently released showing a 3 layer sensor. Sigma has been the leader (I use the term lightly) in this type of sensor design when they purchased Foveon.
Patent Publication No. 2011-129785
- 2011.6.30 Release Date
- 2009.12.18 filing date
- Back-illuminated imaging device
- Plurality of light receiving portion is provided in the order BGR
- In one pixel, the charge collection in the center section, provided the charge read to the end
- Focusing capabilities of the microlenses, light in the center of the charge collection has increased, the charge read out at the end of the light is reduced
- Therefore, in reading the charge of B, it becomes difficult to receive light G, to prevent mixing
- Widest area of B. By mixing pixels with narrow spacing of the pixels (light receiving portion for receiving the G colored in B) to prevent
- Read the charge and B matches the central microlens. And easy to read the charges received by B, to prevent mixing
- Improve performance by preventing the mixing color separation
Canon is a sensor manufacturer, this sort of research and development was almost a given. There’s lots of advancements to be made in sensor technology.
If anyone has better knowledge of this type of technology, please join the discussion on the forum thread.