Portable laser scanning system and scanning methods having a resonant motor control circuit
US5019764A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Mar 13, 1989 |
| Grant date | May 28, 1991 |
| Priority date | — |
| Expiry date | Mar 13, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K2207/1016
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A lightweight hand-held scanning device for repetitively scanning a laser light source having a laser light generating means and at least one high speed scanning motor controlled by a resonant motor circuit which automatically controls the frequency and amplitude of oscillation of a high speed scanning motor. The frequency and amplitude control is accomplished by using a single feedback signal obtained from the windings of the motor which indicates resonance and which also measures the amplitude of oscillation. The feedback signal obtained is a second harmonic of the driving current. The circuit can be utilized to tune and maintain the motor in a resonant oscillating mode. By controlling both the frequency and amplitude of oscillation the high speed scanning motor can maintain a consistent scanning speed and use less power.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.