Passive infra-red detectors
First Claim
1. A passive infra-red detector comprising:
- at least three sub-detectors, each of said at least three sub-detectors being operative to receive infra-red radiation from a corresponding one of at least three sub fields-of-view, each of said at least three sub fields-of-view being exclusively defined by an optical element which does not define any other of said at least three sub fields of view, said at least three sub fields-of-view being angled with respect to each other, adjacent ones of said at least three sub fields-of-view being separated by a gap of no more than 30 degrees and each of said at least three sub fields-of-view extending over no more than 45 degrees in azimuth; and
signal processing circuitry, operative to receive output signals from said at least three sub detectors and to provide a motion detection output.
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Accused Products
Abstract
A passive infra-red detector including at least three sub-detectors, each sub-detector being operative to receive infra-red radiation from a corresponding one of at least three sub fields-of-view, each sub field-of-view being exclusively defined by an optical element which does not define any other sub field of view, the sub fields-of-view being angled with respect to each other, adjacent ones of the sub fields-of-view being separated by a gap of no more than 30 degrees and at least one of the sub fields-of-view having at least one of the following characteristics: extending over no more then 45 degrees in azimuth; and including not more than three azimuthally distributed detection zones, and signal processing circuitry, operative to receive output signals from the sub detectors and to provide a motion detection output.
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Citations
67 Claims
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1. A passive infra-red detector comprising:
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at least three sub-detectors, each of said at least three sub-detectors being operative to receive infra-red radiation from a corresponding one of at least three sub fields-of-view, each of said at least three sub fields-of-view being exclusively defined by an optical element which does not define any other of said at least three sub fields of view, said at least three sub fields-of-view being angled with respect to each other, adjacent ones of said at least three sub fields-of-view being separated by a gap of no more than 30 degrees and each of said at least three sub fields-of-view extending over no more than 45 degrees in azimuth; and signal processing circuitry, operative to receive output signals from said at least three sub detectors and to provide a motion detection output. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35)
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36. A passive infra-red detector comprising:
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at least three sub-detectors, each operative to receive infra-red radiation from a corresponding one of at least three sub fields-of-view; and signal processing circuitry, receiving output signals from at least two of said at least three sub-detectors and providing a motion detection output in response to receipt of said output signals;
noting, within a predetermined first time period, multiple detections by one of said at least two sub-detectors and the absence of detections by another of said at least two sub-detectors and being operative to ignore future detections by said one of said at least two sub-detectors for at least a predetermined second time period. - View Dependent Claims (37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 65, 66, 67)
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Specification