MONITORING SCAN MIRROR MOTION IN ELECTRO-OPTICAL READERS AND IMAGE PROJECTORS

Crosstalk between a drive coil (72, 240) and a primary feedback coil (210) is eliminated by positioning a secondary feedback coil (212) in proximity with the drive coil for contamination by the crosstalk to the same extent as the primary feedback coil (210), and by processing feedback signals genera...

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Bibliographische Detailangaben
1. Verfasser:	WOOD, FREDERICK, F
Format:	Patent
Sprache:	eng ; fre
Schlagworte:	ACCESSORIES THEREFOR APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USINGWAVES OTHER THAN OPTICAL WAVES APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FORPROJECTING OR VIEWING THEM BASIC ELECTRIC ELEMENTS CINEMATOGRAPHY DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING DEVICES USING STIMULATED EMISSION ELECTRIC COMMUNICATION TECHNIQUE ELECTRIC SWITCHES ELECTRICITY ELECTROGRAPHY EMERGENCY PROTECTIVE DEVICES FREQUENCY-CHANGING HOLOGRAPHY INDUCTANCES MAGNETS MEASURING MEASURING ANGLES MEASURING AREAS MEASURING IRREGULARITIES OF SURFACES OR CONTOURS MEASURING LENGTH, THICKNESS OR SIMILAR LINEARDIMENSIONS NON-LINEAR OPTICS OPTICAL ANALOGUE/DIGITAL CONVERTERS OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS OPTICAL LOGIC ELEMENTS OPTICS PHOTOGRAPHY PHYSICS PICTORIAL COMMUNICATION, e.g. TELEVISION RELAYS SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES SELECTORS TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF TESTING TRANSFORMERS
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Beschreibung
Zusammenfassung:	Crosstalk between a drive coil (72, 240) and a primary feedback coil (210) is eliminated by positioning a secondary feedback coil (212) in proximity with the drive coil for contamination by the crosstalk to the same extent as the primary feedback coil (210), and by processing feedback signals generated by the feedback coils to cancel the crosstalk. The drive coil (72, 240) is used to oscillate a scan mirror (64) employed in an image projection arrangement (20) or an electro-optical reader (220). La présente invention concerne un procédé pour éliminer une diaphonie entre une bobine d'excitation et une bobine de rétroaction primaire. Ce procédé consiste à placer une bobine de rétroaction secondaire à proximité de la bobine d'excitation afin de la contaminer avec la diaphonie dans la même mesure que la bobine de rétroaction primaire, puis à traiter des signaux de rétroaction produits par les bobines de rétroaction, afin d'annuler la diaphonie. La bobine d'excitation est utilisée pour faire osciller un miroir de balayage employé dans un système de projection d'images ou dans un lecteur électro-optique.