Canon Patents

Patent: Coating for ND Filter from Canon

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Is Canon getting further into the filter business? A patent for a new coating on an ND filter has been published. The coating is to help minimize ghosting.

Patent Publication No. 2015-200805 (Google Translated)

  • Published 2015.11.12
  • Filing date 2014.4.9
  • On the surface of the transparent substrate made of synthetic resin, deposited the inorganic hard film of fine uneven periodic structure
  • The refractive index changes toward the surface layer side from the transparent substrate side

Canon could potentially find some value getting into the filter business, they probably have a good margin and Canon knows a things or two about optics.

As noted in the forum, this could also be for internal ND filters that are in some video cameras and point & shoots.

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