Archive for: foveon

Patent: Canon Foveon Sensor

Patent: Canon Foveon Sensor

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

Canon patent

  • 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

Source: [EG]

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Canon 3 Layer Sensor (Foveon Type?) Patent

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

Canon patent

  • 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.

thanks Evgnii

cr