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Canon applies for a patent for an improved electronic variable ND filter
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Canon applies for a patent for an improved electronic variable ND filter

This patent application is looking at improving the light wavelight response of the ND filter as you increase the ND value.  It is preferred that the ND amount remain consistent throughout the visible light wavelength as this prevents whitebalance shifting, and color casting.  This patent deals with different chemical compounds that react to electricity to provide the ND filter.  This filter sits just in front of hte image sensor as part of the sensor filter stack (109 or 101 in the image).

 

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How to view Japan Patent applications.

Unfortunately, there's no direct way of linking to the patent application (sad!) however, this is the easiest process to view a japan patent or application.

  1. Go to the Japan Patent Office search page.
  2. If it's a patent application (they are usually in the format of Year-Number ie: 2017-011300) then type the patent application number into the second field down from the top where it says publication of patent application. 
  3. Click on search.
  4. Then click on the patent application number link, and there's the patent application!

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