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Canon Patent: Three Layer Image Sensor

Canon Patent

Indefatigable Japanese site Egami (translated) spotted another Canon patent. It concerns a 3-layer image sensor that appears to be particularly sensitive to light. No idea where such a sensor could be employed, maybe in a future generation of high-end cameras?

Patent description (machine translated):

  • Patent Publication No. 2013-93553
    • 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
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