Illumination and light gate utilization methods and apparatus

Methods and apparatus for reading information from a record with the aid of a plurality of electrically controlled light gates illuminate the light gates with light of a first intensity above zero light intensity and precondition the light gates to subsequent opening in response to electric control...

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Bibliographische Detailangaben
Hauptverfasser:	JACOBS, JOHN H
Format:	Patent
Sprache:	eng
Schlagworte:	ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVEREDIN A SINGLE OTHER SUBCLASS 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 ELECTRIC COMMUNICATION TECHNIQUE ELECTRICITY FREQUENCY-CHANGING MEASURING MEASURING ELECTRIC VARIABLES MEASURING MAGNETIC VARIABLES MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR NON-LINEAR OPTICS OPTICAL ANALOGUE/DIGITAL CONVERTERS OPTICAL LOGIC ELEMENTS OPTICS PHYSICS PICTORIAL COMMUNICATION, e.g. TELEVISION TARIFF METERING APPARATUS TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF TESTING
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Beschreibung
Zusammenfassung:	Methods and apparatus for reading information from a record with the aid of a plurality of electrically controlled light gates illuminate the light gates with light of a first intensity above zero light intensity and precondition the light gates to subsequent opening in response to electric control signals by electrically biasing the light gates to an initially open condition wherein the gates pass light from the illumination at an intensity above zero light intensity and below a second intensity lower than the first intensity. These methods and apparatus also subject the record to a first illumination by said light of an intensity above zero light intensity and below the second intensity as passed by the preconditioned gates in the initially open condition, subject the record to a second illumination by further opening the preconditioned light gates in response to electric control signals to pass light at at least the second light intensity and scan the record with the passed light at at least the second intensity, and read information from the record only in response to the second illumination as among the first and second illuminations.