I had trouble understanding this patent, which covers a lot of different variables. Keith at Northlight breaks it down:

An interesting Canon patent reverses a fixed semitransparent mirror, to just divert light to a phase AF unit, whilst an EVF appears where the focus screen would be.

Patent Publication No. 2015-97352 (Google Translated)

  • Published 2015.5.21
  • Filing date 2013.11.15

Canon patents

  • Half mirror and the optical path division by
  • One of the light beam received by the image pickup device
  • The other light flux I receive in AF sensor
  • FPS of the AF sensor, faster than the image pickup device
  • Pixel area of ​​the AF sensor is larger than the image pickup device
  • From the AF sensor and the image sensor to obtain an image to be displayed on the EVF or back display
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