Canon Patent For Super Fast Auto-Focus Using 2 Motors

Egami has discovered a new patent filed by Canon. The new patent describes a dual motor autofocus for STM lenses which could be the next step in STM lens technology.

The patent image shows a leaf shutter mechanism. The AF in the patent is driven by 2 motors, the main STM and an auxiliary DCM motor. EF Leaf shutter lens that will allow a true 1/1000s are on the drawing board.

See the patent details below.

Canon Patent For Super Fast Auto-Focus Using 2 Motors



  • Patent Publication No. 2014-164106
    • Published Date 2014.9.8
    • Filing date 2013.2.25
  • Example 1
    • Moving the aperture one two motors
    • Main motor STM
    • Auxiliary motor DCM
    • And then rotate the first auxiliary motor, to assist the acceleration of the main motor

via Egami

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