US 8,797,162 B2Granted

Anti-theft system using RFID tags

AssigneesHONG FU JIN PRECISION INDUSTRY (ShenZhen) CO., LTD., Hon Hai Precision Industry Co., Ltd.

InventorsHsin-Pei Chang, Zong-Yuan Sun, Da-Hua Xiao

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Abstract

A detection unit positioned on a package includes a magnet, a first magnetic switch, a second magnetic switch, a processor, and a clock. The first magnetic switch outputs a first control signal or a second control signal according to magnetic flux density of the magnet. The second magnetic switch outputs a third control signal or a fourth control signal according to the magnetic flux density of the magnet. The first control signal is the same as the third control signal; the second control signal is the same as the fourth control signal. When the processor receives the first control signal and the third control signal at the same time, the processor reads a first real-time clock (RTC) signal from the clock. When the processor receives the second control signal and the fourth control signal at the same time, the processor reads a second RTC signal from the clock.

Claims13

Dependent claims

A detection unit comprising:

a magnet;
a first magnetic switch predetermining a first magnetic threshold, the first magnetic switch outputting a first control signal if magnetic flux density of the magnet is greater than the first predetermined magnetic threshold, and outputting a second control signal according if the magnetic flux density of the magnet is less than the first predetermined magnetic threshold;
a second magnetic switch predetermining a second magnetic threshold, the first magnetic switch outputting a third control signal if the magnetic flux density of the magnet is greater than the second predetermined magnetic threshold, and outputting a fourth control signal according if the magnetic flux density of the magnet is less than the second predetermined magnetic threshold, the first control signal being the same as the third control signal, the second control signal being the same as the fourth control signal;
a processor electronically connected to the first magnetic switch and the second magnetic switch;
and
a clock electronically connected to the processor;
in response to receiving the first control signal and the third control signal from the first magnetic switch or the second magnetic switch, the processor reads a first real-time clock (RTC) signal from the clock;
and
in response to receiving the first control signal and the third control signal from the first magnetic switch or the second magnetic switch, the processor reads a second RTC signal from the clock.

6 more elements

An anti-theft system used in a package, the anti-theft system comprising:

a magnet;
a first magnetic switch predetermining a first magnetic threshold, the first magnetic switch outputting a first control signal if magnetic flux density of the magnet is greater than the first predetermined magnetic threshold, and outputting a second control signal according if the magnetic flux density of the magnet is less than the first predetermined magnetic threshold;
a second magnetic switch predetermining a second magnetic threshold, the first magnetic switch outputting a third control signal if the magnetic flux density of the magnet is greater than the second predetermined magnetic threshold, and outputting a fourth control signal according if the magnetic flux density of the magnet is less than the second predetermined magnetic threshold, the first control signal being the same as the third control signal, the second control signal being the same as the fourth control signal;
a processor electronically connected to the first magnetic switch and the second magnetic switch;
and
a clock electronically connected to the processor;
wherein when the package is opened, the processor receives the second control signal and the fourth control signal at the same time, and reads a real-time clock (RTC) signal from the clock accordingly.

4 more elements

Dependencies are inferred from the claim text.