Canon Patent Application: Hybrid Optical and Electronic Viewfinder

Even though Canon came out with the EOS RF system that uses an EVF, Canon has continued to work on hybrid viewfinders, as shown in this patent application.

The present invention relates to the single-lens reflex camera which has an optical finder and an electronic finder, and relates to the change of the finder to which seeds responded as for the electronic device with which the especially single-lens reflex camera was equipped, or the optical element. 

In recent years, the single-lens reflex camera which has a finder which has arranged the optical-path dividing prism in the optical path of an optical finder in a single-lens reflex camera, and has arranged the display device which becomes the equivalent position from a liquid crystal panel etc. optically with a focus detecting plate is known. 

This is a pretty extensive patent. I wonder if we'll see it in an EF mount camera as a stepping stone into the RF mount system.

Japan Patent Application 2019-020538