OPTICAL PROBE FOR CATHODE RAY TUBES

A fiber optics probe, embedded in the faceplate of a cathode ray tube, samples the light emitted from the cathode ray tube phosphor coating. The sampled light is sensed and provides an equivalent electrical signal. The magnitude of the signal is compared with a signal proportional to the ambient lig...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	TILTON H,US, BLANCHARD J,US
Format:	Patent
Sprache:	eng
Schlagworte:	BASIC ELECTRIC ELEMENTS ELECTRIC COMMUNICATION TECHNIQUE ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS ELECTRICITY PICTORIAL COMMUNICATION, e.g. TELEVISION
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Beschreibung
Zusammenfassung:	A fiber optics probe, embedded in the faceplate of a cathode ray tube, samples the light emitted from the cathode ray tube phosphor coating. The sampled light is sensed and provides an equivalent electrical signal. The magnitude of the signal is compared with a signal proportional to the ambient light and the resultant signal is utilized to effect an automatic brightness control function. The resultant signal may also be used to effect a built-in test of the cathode ray tube drive and display circuits.