EP0021630A2
Expired / Lapsed
EP
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Infrared intrusion detector and optical system for such a detector
Assignee: Isotec Industries Ltd
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Filing: 1980-06-02
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Granted: —
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Expires: 2000-06-02
Abstract
Abstract An infrared instrusion detector has an otpical system for gathering infrared radiation from discrete sensitive regions and focusing such received radiation onto an infrared radiation sensor. The detector includes a monitoring device to sound an alarm when radiation sensed reaches a predetermined level. The optical system comprises an optical collector for gathering radiation from a field which includes the sensitive regions and for converging such radiation onto a plurality of reflectors. Each reflector determines one of the discrete sensitive regions and, in turn, is oriented to reflect converging radiation gathered from a sensitive region on the detector. The invention provides a simple, efficient optic system for a broad field of gathering infrared radiation, concentrating and focusing it in a manner to provide sufficient levels of received radiation for purposes of detection.
Inventors
- 👤 Zbigniew W. Turlej
- 👤 Donald Frederick Hawken
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-30 19:00
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/18; G08B13/189; G08B13/19; G08B13/193
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
78 words
In an infrared intrusion detector, an optical device to direct gathered infrared radiation from several discrete, spaced-apart sensitive regions onto an infrared radiation sensor, said device comprising an optical collector for gathering infrared radiation from a space including such sensitive regions and for converging such radiation onto a plurality of reflectors, each reflector determining a discrete sensitive region and, in turn, oriented to reflect converging radiation gathered from a corresponding discrete sensitive region onto an infrared radiation sensor.
Claim 2
Dependent Claim
78 words
In an infrared intrusion detector, an optical device to direct gathered infrared radiation from several discrete, spaced-apart sensitive regions onto an infrared radiation sensor, said device comprising an optical collector for gathering infrared radiation from a space including such sensitive regions and for converging such radiation onto a plurality of reflectors, each reflector determining a discrete sensitive region and, in turn, oriented to reflect converging radiation gathered from a corresponding discrete sensitive region onto an infrared radiation sensor.
Claim 3
Dependent Claim
17 words
An infrared intrusion detector according to Claim 1, in which said optical collector comprises a concave mirror.
Claim 4
Dependent Claim
17 words
An infrared intrusion detector according to Claim 1, in which said optical collector comprises a convex lens.
Claim 5
Dependent Claim
33 words
An infrared intrusion detector according to Claim 1, 2 or 3 in which each reflector comprises a planar mirror oriented differently from adjacent planar mirrors to thereby determine said discrete, spaced-apart sensitive regions.
Claim 6
Dependent Claim
46 words
An infrared intrusion detector according to any one of the preceding claims, in which said optical collector has a focal point for reflected converging radiation between said optical collector and said plurality of reflectors and, an infrared radiation sensor is positioned proximate to said .focal point.
Claim 7
Dependent Claim
38 words
An infrared intrusion detector according to any one of Claims 1 to 4, in which said optical collector in combination with said plurality of reflectors converges radiation to a point located between them, where a radiation sensor-is positionable.
Claim 8
Dependent Claim
32 words
An infrared intrusion detector according to Claim 5 or 6, in which said reflectors are oriented to permit locating said sensor in a position which is non-interfering with converging beams of radiation.
Claim 9
Dependent Claim
56 words
An infrared intrusion detector according to anyone of the preceding claims comprising a spaced-apart pair of said optical collectors, each to a side of an infrared radiation detector and a separate set of a plurality of reflectors associated with each optical collector to reflect converging radiation from corresponding discrete sensitive regions onto said infrared radiation detector.
Claim 10
Dependent Claim
17 words
An infrared intrusion detector according to Claim 8, in which each optical collector is a concave mirror.
Claim 11
Dependent Claim
17 words
An infrared intrusion detector according to Claim 9, in which said concave mirror is a spherical mirror.
Claim 12
Dependent Claim
44 words
An infrared intrusion detector according to Claim 1, in which said optical collector is a ring having an annular reflective concave surface and the reflectors of said plurality of reflectors are positioned in quadrants to define discrete sensitive regions in each of four areas.
Claim 13
Dependent Claim
21 words
An infrared intrusion detector of Claim 11, in which a planar mirror is positioned in each quadrant for the reflector arrangement.
Claim 14
Dependent Claim
26 words
An infrared intrusion detector according to Claim 11, in which said reflectors are arranged to define sensitive regions in upper and lower areas and side-by-side areas.
Claim 15
Dependent Claim
114 words
System of mirrors adapted for use with an infrared intrusion detector having an infrared radiation sensor, said mirror system receiving infrared radiation from several discrete, spaced-apart sensitive regions and focusing such received radiation onto an infrared sensor, said mirror system comprising a concavely curved mirror for receiving infrared radiation from an area which includes such regions of detection, and directing such received radiation onto an array of planar mirrors, each planar mirror providing a predetermined discrete detection region, said planar mirror being positioned to reflect radiation received from a corresponding detection region onto an infrared radiation sensor, said concavely curved mirror having a focal point proximate the receiving portion of an infrared rediation sensor.
Claim 16
Dependent Claim
114 words
System of mirrors adapted for use with an infrared intrusion detector having an infrared radiation sensor, said mirror system receiving infrared radiation from several discrete, spaced-apart sensitive regions and focusing such received radiation onto an infrared sensor, said mirror system comprising a concavely curved mirror for receiving infrared radiation from an area which includes such regions of detection, and directing such received radiation onto an array of planar mirrors, each planar mirror providing a predetermined discrete detection region, said planar mirror being positioned to reflect radiation received from a corresponding detection region onto an infrared radiation sensor, said concavely curved mirror having a focal point proximate the receiving portion of an infrared rediation sensor.
Claim 17
Dependent Claim
37 words
A system of claim 14, wherein said concavely curved mirror is a spherical mirror having a radius of curvature equal to double the distance the radiation travels in reflection from spherical mirror to planar mirror to sensor.
Claim 18
Dependent Claim
24 words
A system of claim 14, wherein each planar mirror is oriented differently from adjacent planar mirrors to thereby define such discrete, spaced-apart detection regions.
Claim 19
Dependent Claim
61 words
A system of claim 14, wherein there is a pair of spaced-apart concavely curved mirrors, each being adapted for offset positioning relative to an infrared radiation detector, sets of a plurality of planar mirrors in the array, each set associated with a corresponding curved mirror to reflect focused radiation received from a corresponding discrete detection region onto an infrared radiation detector.
Claim 20
Dependent Claim
13 words
A system of claim 17, wherein each concave mirror is a spherical mirror.
Claim 21
Dependent Claim
40 words
19 . A system of claim 14, wherein said concavely curved mirror is a ring having an annular reflective concave surface; said array of planar mirrors being positioned in quadrants to define discrete detection regions in each of four areas.
Claim 22
Dependent Claim
17 words
A system of claim 19, wherein a planar mirror is positioned in each quadrant of the array.
Claim 23
Dependent Claim
35 words
A system of claim 19, wherein said array of planar mirrors is arranged to define sensitive regions in upper and lower areas and side-by-side areas of the space in which intrusion is to be detected.
References Cited (Backward Citations)
No citation records indexed.
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