Patent · US Active

Scanning mirror control

US7952783B2 · kind B2 · utility

21Cited by

1References

25Claims

0Family size

Assignee

Microvision, Inc. · US

Inventors

Steve Holmes · Beaverton, US
Clint Charles Rollins · Poulsbo, US
Margaret K. Brown · Seattle, US
Michael Schaaf · Solingen, DE
Bruce C. Rothaar · Woodinville, US
Robert James Jackson · Monroe, US
Lifford McLauchlan · Port Aransas, US
Mehrube Mehrubeoglu · Port Aransas, US
Gregory Schneider · Occidental, US

Key dates

Filing date	Sep 22, 2008
Grant date	May 31, 2011
Priority date	—
Expiry date	Feb 16, 2030

Classification

Technology area (CPC H)Electricity
CPC primaryH02P29/50
WIPO fieldElectrical machinery, apparatus, energy
WIPO sectorElectrical engineering

Abstract

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.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.