Patent Number: 8,089,465

Title: Speckle interference laser tracking

Abstract: An optical tracking system is disclosed that provides more precise tracking and better performance in an optical mouse. It involves provides a collimated laser, and imaging a reflection of the collimated laser, such that the reflection has a substantially linear phase gradient. The reflection of the laser includes a pattern of speckles due to optical interference effects. The speckles are imaged such that the substantially linear phase gradient restricts any variation in intensity of the imaging of the speckles during a translating motion of the reflection, thereby providing superior tracking performance.

Inventors: Lutian; John (Bellevue, WA)

Assignee: Microsoft Corporation

International Classification: G06F 3/033 (20060101); G02B 27/10 (20060101); G02B 27/30 (20060101); G02B 3/00 (20060101); G06M 7/00 (20060101)

Expiration Date: 2020-01-03 0:00:00