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Canon Patent Application: Diffractive Optics Patent
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Canon Patent Application: Diffractive Optics Patent

We've uncovered many diffractive optics patents over the years, and while perhaps it wasn't the lenses we were all looking for, it's certain now that Canon's improvements in DO elements produced the ultra inexpensive 600 and 800mm F11 telephotos.

This patent application is a method of manufacturing of a DO element that suppresses short wavelength light.

In Canon's own words:

To provide a diffractive optical element having excellent image quality while suppressing the influence of scattering in a short wavelength region.  SOLUTION: A close-contact two-layer diffractive optical element having a base material, a first resin layer having a diffraction grating shape composed of a plurality of concentric rings on the base material, and a second resin layer laminated in this order. Therefore, a low transmittance portion whose transmittance is lowered is provided at a position not including at least one lattice portion of the first resin layer and the second resin layer, and the internal transmittance of the low transmittance portion is the lattice portion. In comparison, it is characterized by being 2% or more and 6% or less lower at a wavelength of 400 nm.

Canon Patent Application 2020-170050

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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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