Apple Inc.
Optical encoder with direction-dependent optical properties comprising a spindle having an array of surface features defining a concave contour along a first direction and a convex contour along a second direction

Abstract:

Embodiments of the present disclosure provide an optical encoder for an electronic device. The optical encoder includes a spindle and an encoded pattern disposed around a circumference of the spindle. The encoded pattern may include one or more surface features that create a direction-dependent reflective region.