Method and means for illuminating an electronic or an electromechanical device

A light emitting diode (D3) illuminates the watch face when required but in standby mode acts as a detector of ambient light. The output from the diode in detector mode is supplied to a transistor (T1) and resistor (R1) which in turn feed a logic circuit (1) such that the lighting level when next sw...

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Bibliographische Detailangaben
Hauptverfasser:	CRISTONI, ROMANO, GRUPP, JOACHIM, POLI, GIAN-CARLO
Format:	Patent
Sprache:	eng ; fre ; ger
Schlagworte:	ELECTRIC HEATING ELECTRIC LIGHTING NOT OTHERWISE PROVIDED FOR ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR ELECTRICITY ELECTRONIC TIME-PIECES HOROLOGY MECHANICAL PARTS OF CLOCKS OR WATCHES IN GENERAL MECHANICALLY-DRIVEN CLOCKS OR WATCHES PHYSICS TIME PIECES USING THE POSITION OF THE SUN, MOON OR STARS
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Beschreibung
Zusammenfassung:	A light emitting diode (D3) illuminates the watch face when required but in standby mode acts as a detector of ambient light. The output from the diode in detector mode is supplied to a transistor (T1) and resistor (R1) which in turn feed a logic circuit (1) such that the lighting level when next switched on (PB1) is high or low according to the measured ambient light level. A further circuit (C3, R9) allows for eye adjustment time. An INDEPENDANT CLAIM is also included for : A lighting control method for wristwatches or similar which uses a light emitting diode to measure the ambient light level as well as for illumination.