Light shield

Disclosed is a sensor shield for use in a multi-shelf merchandise display unit including a plurality of sensors mounted on a wall of the unit and opposite a source of illumination, in which each sensor corresponds to a single shelf and in which the shelves are at least semi-porous to the illuminatio...

Ausführliche Beschreibung

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Bibliographische Detailangaben
Hauptverfasser:	LAMBERT PHILIP ERIC, BARCROFT ANTHONY FRANCIS
Format:	Patent
Sprache:	eng
Schlagworte:	ALARM SYSTEMS COFFEE MILLS COLORIMETRY DETECTING MASSES OR OBJECTS DOMESTIC ARTICLES OR APPLIANCES FURNITURE GEOPHYSICS GRAVITATIONAL MEASUREMENTS HUMAN NECESSITIES MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT,POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRA-RED,VISIBLE OR ULTRA-VIOLET LIGHT MEASURING ORDER TELEGRAPHS PAYING COUNTERS PHYSICS RADIATION PYROMETRY SIGNALLING SIGNALLING OR CALLING SYSTEMS SPECIAL FURNITURE, FITTINGS, OR ACCESSORIES FOR SHOPS,STOREHOUSES, BARS, RESTAURANTS OR THE LIKE SPICE MILLS SUCTION CLEANERS IN GENERAL TESTING
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Beschreibung
Zusammenfassung:	Disclosed is a sensor shield for use in a multi-shelf merchandise display unit including a plurality of sensors mounted on a wall of the unit and opposite a source of illumination, in which each sensor corresponds to a single shelf and in which the shelves are at least semi-porous to the illumination. The shield comprises i) a plate having a length that is sufficient substantially to reduce or prevent incident illumination from the shelf above reaching the sensor; and ii) means to attach the plate to casing of or around the sensor or the wall of the unit. The plate is opaque to the illumination detected by the sensor. Also disclosed is a method to reduce the interference of light in a multi-shelf merchandise display unit from shelves above a shelf on which stock levels are being measured and a method for monitoring stock levels in a retail display cabinet by measuring light entering the retail display cabinet.