Secure magnetic sensor
AssigneeInet Consulting Limited Company
InventorsKazunori Yuze, Larry Tracy
Life of this patent
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Abstract
A secure magnetic sensor has a first magnetic switch activatable by a first magnetic field and a second magnetic switch activatable by a second magnetic field which is stronger than the first magnetic field. The first magnetic switch is electrically connected in series to the second magnetic switch. In the default position, the first magnetic switch is in the open position whereas the second magnetic switch is in the closed position. When the secure magnetic sensor is normally activated, the first magnetic switch is activated to close. However, when the secure magnetic sensor is tampered by the addition of a supplemental magnet, this causes the second magnetic switch to be in an open position thereby sounding an alarm.
Claims16
A secure magnetic sensor comprising:
- a first magnetic switch activatable by a first magnetic field;
- a second magnetic switch activatable by a second magnetic field, different from said first magnetic field, wherein said second magnetic field is stronger than said first magnetic field;
- and
- said first magnetic switch is electrically connected in series to said second magnetic switch.
A magnetic sensor comprising:
- a first magnetic attracting member activatable by a first magnetic field, for electrically connecting a first terminal to a second terminal;
- a second magnetic attracting member activatable by a second magnetic field for disconnecting an electrical connection from a third terminal to a fourth terminal;
- wherein said second magnetic field is stronger than said first magnetic field;
- said second terminal electrically connected to said third terminal;
- and
- wherein said sensor has two contacts:
- the first terminal and the fourth terminal.
Dependencies are inferred from the claim text.