公开(公告)号：US20180010930A1

公开(公告)日：2018-01-11

申请号：US15206068

申请日：2016-07-08

Applicant: Apple Inc.

Inventor： Serhan O. ISIKMAN ,  Anant RAI ,  Prashanth HOLENARSIPUR ,  Richard RUH ,  Takahiro ATSUTA ,  Akio YAMAKAWA ,  Yoshimitsu OHARA

IPC: G01D5/30 ,  G01D5/28

CPC classification number: G01D5/30 ,  G01D5/285 ,  G01D5/3473

Abstract: In some examples, an optical encoder may consist of a light source that shines light onto a wheel which then reflects the light onto a sensor. Using information encoded in the reflected light, the rotation of the wheel may be determined. In some examples, rotation of the wheel may be determined by detecting an encoding pattern in light reflected from an exterior surface of the wheel. In some examples, the encoding pattern can be a pattern of light and dark stripes. In some examples, a pattern of light stripes can be generated from light reflecting off of reflective portions of the wheel. Some examples of the disclosure relate to using a surface topology for a wheel that can be used to generate an encoding pattern of light and dark stripes in light reflected from the surface of the wheel, even when the surface of the wheel is uniformly reflective.