Device for the monitoring of objects and/or persons
First Claim
1. In a device for the monitoring of objects and/or persons, in conjunction with an RF transmitter, and being in the form of a security tag with a casing accommodating an electronic circuit which comprises a battery and an alarm circuit, and which further comprises on the one hand an electrically conducting security element for attaching the security tag to the object/the person which triggers an alarm if severed, and which comprises on the other hand an RF receiver for alternative triggering of an alarm in response to an external RF field generated by the RF transmitter;
- the improvement wherein the electronic circuit further comprises an alarm circuit (30) and a decoder (20) which outputs an alarm signal to the alarm circuit (30) to trigger an alarm when a defined information content of a coded RF signal from an RF transmitter is present;
wherein the decoder (20) and the alarm circuit (30) are designed in such a manner that when a first alarm code is received the alarm is triggered, and when a second reset code is received a triggered alarm is switched off; and
wherein the decoder (20) comprises a suppression circuit (30) which then outputs an alarm signal to the alarm circuit (30) if the second reset code is not received.
1 Assignment
0 Petitions
Accused Products
Abstract
A device for the monitoring of objects and/or persons is described which comprises an RF transmitter (10) and a security tag (15) with a casing for accommodating an electronic circuit. The electronic circuit contains a battery and an alarm circuit (30). An alarm is triggered when an electrically conductive security element (14) for attaching the security tag (15) to the object or to the person is severed or when an external RF field generated by the RF transmitter (10) has a defined state. The RF transmitter (10) is here designed with an encoder (11) for coding the RF signal, while in the electronic circuit of the security tag (15) a decoder (20) is provided which outputs an alarm signal to the alarm circuit (30) to trigger an alarm when a defined information content of the coded RF signal is present.
91 Citations
42 Claims
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1. In a device for the monitoring of objects and/or persons, in conjunction with an RF transmitter, and being in the form of a security tag with a casing accommodating an electronic circuit which comprises a battery and an alarm circuit, and which further comprises on the one hand an electrically conducting security element for attaching the security tag to the object/the person which triggers an alarm if severed, and which comprises on the other hand an RF receiver for alternative triggering of an alarm in response to an external RF field generated by the RF transmitter;
- the improvement wherein the electronic circuit further comprises an alarm circuit (30) and a decoder (20) which outputs an alarm signal to the alarm circuit (30) to trigger an alarm when a defined information content of a coded RF signal from an RF transmitter is present;
wherein the decoder (20) and the alarm circuit (30) are designed in such a manner that when a first alarm code is received the alarm is triggered, and when a second reset code is received a triggered alarm is switched off; and wherein the decoder (20) comprises a suppression circuit (30) which then outputs an alarm signal to the alarm circuit (30) if the second reset code is not received. - 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, 30, 41, 42)
- the improvement wherein the electronic circuit further comprises an alarm circuit (30) and a decoder (20) which outputs an alarm signal to the alarm circuit (30) to trigger an alarm when a defined information content of a coded RF signal from an RF transmitter is present;
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29. In a device for the monitoring of objects and/or persons, in conjunction with an RF transmitter, and being in the form of a security tag with a casing accommodating an electronic circuit which comprises a battery and an alarm circuit, and which further comprises on the one hand an electrically conducting security element for attaching the security tag to the object/the person which triggers an alarm if severed, and which comprises on the other hand an RF receiver for alternative triggering of an alarm in response to an external RF field generated by the RF transmitter;
- the improvement wherein the electronic circuit further comprises an alarm circuit (30) and a decoder (20) which outputs an alarm signal to the alarm circuit (30) to trigger an alarm when a defined information content of a coded RF signal from an RF transmitter is present; and
wherein the electronic circuit comprises a timing circuit (40) which outputs at defined intervals switch-on signals to controllable switches (43,
44) between the battery (45) and the power supply connections (Vcc) of power-consuming components (27,
28) or assemblies (19, 20, 24,
26) to sample the alarm states. - View Dependent Claims (31, 32, 33, 34, 35, 36, 37, 38, 39, 40)
- the improvement wherein the electronic circuit further comprises an alarm circuit (30) and a decoder (20) which outputs an alarm signal to the alarm circuit (30) to trigger an alarm when a defined information content of a coded RF signal from an RF transmitter is present; and
Specification