公开(公告)号：US09810573B2

公开(公告)日：2017-11-07

申请号：US14932011

申请日：2015-11-04

Applicant: Elstat Electronics Ltd.

Inventor： Philip Eric Lambert ,  Anthony Francis Barcroft

IPC: G01J1/02 ,  A47F10/02 ,  G01V8/00 ,  G08B21/18 ,  G01V8/12 ,  G01J5/04 ,  G01V8/10 ,  G01J3/02

CPC classification number: G01J1/0214 ,  A47F10/02 ,  A47F2010/025 ,  G01J1/0266 ,  G01J3/02 ,  G01J3/0262 ,  G01J5/041 ,  G01V8/00 ,  G01V8/10 ,  G01V8/12 ,  G08B21/182

Abstract: 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.