EP0255812A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Monitoring device with infrared and radio-frequency sensor components
Assignee: Elkron SpA
•
Filing: 1987-07-29
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Granted: —
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Expires: 2007-07-29
Abstract
Abstract The device, designed for use in intruder alarm systems, uses a combination of an infrared sensor (11) and a radio-frequency sensor (2, 3) whose operating frequency is substantially in the UHF band.
Inventors
- 👤 Luigi Bianco
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 05:54
CPC Classifications
G; G08; G08B; G08B13/00; G08B13/22; G08B13/24; G08B13/2491; G08B13/2494; G08B13/18; G08B13/189; G08B13/19
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
36 words
A monitoring device using a combination of an infrared sensor (11) and a radio-frequency sensor (2, 3), characterized in that the radio-frequency sensor (2, 3) is selected with an operating frequency substantially in the UHF band.
Claim 2
Dependent Claim
36 words
A monitoring device using a combination of an infrared sensor (11) and a radio-frequency sensor (2, 3), characterized in that the radio-frequency sensor (2, 3) is selected with an operating frequency substantially in the UHF band.
Claim 3
Dependent Claim
18 words
A monitoring device as claimed in claim 1, characterised in that this operating frequency is approximately 2.45 GHz.
Claim 4
Dependent Claim
27 words
A monitoring device as claimed in claim 1 or 2, characterised in that the radio-frequency sensor is formed by a UHF oscillator (2) of the self-detect type.
Claim 5
Independent Claim
26 words
A device as claimed in any one of claims 1 to 3, characterised in that the radio-frequency sensor (2,3) is provided with a strip aerial (3).
Claim 6
Independent Claim
64 words
A device as claimed in any one of claims 1 to 4, characterised in that the infrared sensor (11) and the radio-frequency sensor (2, 3) have outputs (9, 15) for the generation of respective warning signals and in that alarm signal generator means (1O, 1OA, 1OB) are provided and may be activated only in the presence of both the said warning signals (9, 15).
Claim 7
Dependent Claim
81 words
A monitoring device using a combination of an infrared sensor (11) and a radio-frequency sensor (2, 3), particularly as claimed in any one of claims 1 to 4, characterised in that the infrared sensor (11) and the radio-frequency sensor (2, 3) have outputs (1O1, 15), for the generation of respective warning signals and in that alarm signal generator means (1O, 1OA, 1OB) are provided and may be activated even in the presence of only one of these warning signals (1O1, 15).
Claim 8
Independent Claim
62 words
A device as claimed in claims 5 and 6, characterised in that it comprises a connection circuit (1OO) interposed between these outputs (9, 1O1, 15) and the alarm signal generator means (1O, 1OA, 1OB) and may be formed so as to provide the logic product (1O, Fig. 3) or as an alternative the logic sum (1O, Fig. 5) of these warning signals.
Claim 9
Dependent Claim
61 words
A device as claimed in claim 7, characterised in that the radio-frequency sensor (2, 3) has a first (9) and a second (1O1) output with different levels of sensitivity, and in that the said connection circuit (1OO) forms the logic product (1OO, Fig. 3) and the logic sum (1OO, Fig. 5), from the first (9) and the second (1O1) outputs respectively.
References Cited (Backward Citations)
No citation records indexed.
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