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Canon Patent Application: EF-M 18-55 with variable field curvature
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Canon Patent Application: EF-M 18-55 with variable field curvature

This patent application describes a lens that has variable field curvature and a reduction of spherical aberrations.  This is an APS-C mirrorless lens, as indicated by the image height of 13.66mm and the back focus of 11.55mm.

The full lens particulars are;

Focal distance 18.58 53.49 
F number        3.56  5.87 
Field angle    36.32 14.32 
Image height   13.66 13.66 
BF             11.55 11.55


Focal distance 18.54 53.37 
F number        3.5 5 5.86 
Field angle   36.39  14.36 
Image height  13.66  13.66 
BF            10.14  10.14 ​ 

Japan Patent Application 2018159876

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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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