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Canon Patent Application: Variety of lenses discussed
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Canon Patent Application: Variety of lenses discussed

This patent application deals with having the focus group small and light so that fast AF can be achieved.  Also I would imagine this allows Canon to use cheaper focus systems if they choose to do so, versus the high torque USM motors.

The following lenses are shown in the embodiments. 

Focal distance        36.10 
F number               2.92 
Half field angle      20.73
image height          13.66 
Whole length          98.76 
BF 35.46

Focal distance        18.56  48.87 145.41 
F number               3.60   5.56   6.49 
a half field angle -- 36.35  15.62   5.37 
Image height          13.66  13.66  13.66 
Whole length         103.26 118.62 145.33 
BF                    10.65  10.65  10.65 

Focal distance        24.76  30.10  67.98 
F number               2.92   2.92   2.91 
a half field angle -- 41.15  35.71  17.65 
Image height          21.64  21.64  21.64 
Whole length         198.84 183.00 165.88 
BF                    38.37  38.37  38.37 

Focal distance        11.33  15.16  21.84 
F number               4.10   4.65   5.72 
a half field angle--  50.33  42.03  32.02 
Image height          13.66  13.66  13.66 
Whole length          88.44  85.64  87.26 
BF                     9.00  14.02  22.72 

 

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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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