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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
