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Canon Patent Application: Canon RF 40mm F1.8
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Canon Patent Application: Canon RF 40mm F1.8

This is a curious patent application, and which also shows that at times you simply cant use the diagrams in which they give you as a clue to the implementation of the patent application.

This patent application is clearly for a full frame mirrorless camera and for some reason they show a DSLR in the illustrations.  Trust me, I don't get it either.

While we already have a RF 35mm F1.8 macro, this patent application also includes a 42mm or what I guess would be a 40mm F1.8 as well.

Canon RF 40mm F1.8

Focal Length  41.92
F-Number       1.85
Angle of View 27.30
Image Height  21.64
Lens length   71.50
BF            13.97

Canon RF 35mm F1.8

focal length  36.00
F-number       1.85
Angle of view 31.00
Image height  21.64
Lens length   79.97
BF            11.65

Basically this patent application is about keeping the lens small and reducing the AF motor noise at the same time.  Instead of really drilling into the optical design, most of the patent application describes the mechanical design.

Japan Patent Application 2020-034851

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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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