Microvision, Inc.

Steve Holmes

Bruce Rothaar

Margaret K Brown

Robert James Jackson

Mark Alan Champion

Joshua Owen Miller

Bin Xue

Michael Lee Schaaf

Lifford McLauchlan

Lakhbir Gandhi

Harpal Singh Sira

Clint Charles Rollins

Mehrube Mehrubeoglu

Gregory Schneider

Laser light pulses are reflected off a scanning mirror. A time-of-flight distance measurement device receives reflected light pulses and determines distances. The light pulses have abrupt changes in amplitude. Reflected pulses are differentiated to reduce sensitivity to amplitude variations. Differentiated pulses may be compressed to keep the receiver from saturating. Distance measurements are combined with location information to produce a 3D image of a surface.

Scanning laser time of flight 3D imaging

A scanning projector includes a mirror that scans in two dimensions, at least one of which is sinusoidal. A position sensor provides a position signal that represents an angular displacement of the mirror. The position signal is amplified by an amplifier with time variant characteristics. A beam position determination component compensates for the time variant characteristics of the amplifier.

Scanning mirror position determination

A scanning beam projection system includes a scanning mirror having a fast-scan axis and a slow-scan axis. Movement on the slow-scan axis is controlled by a slow-scan scanning mirror control system. The control system receives position information describing angular displacement of the mirror. An outer loop of the control system operates in the frequency domain and determines harmonic drive coefficients for a scanning mirror drive signal. An inner loop of the control system operates in the time domain and compensates for a scanning mirror resonant vibration mode at a frequency within the frequency band occupied by the harmonic drive coefficients.

Scanning mirror control

Growing community of inventors

Sammamish, WA, United States of America

Steve Holmes