Glass anti-theft device

Abstract

The invention provides a glass anti-theft device consisting of an infrared transmitting tube, an infrared receiving tube, an optical fiber, a normally closed relay and an alarm, wherein the optical fiber is adhered to the lower side of glass in a wave shape and clamped between two layers of glass; the transmitting end of the infrared transmitting tube and the receiving end of the infrared receiving tube are arranged on two ends of the optical fiber, and the transmitting end of the infrared transmitting tube does not face toward the receiving end of the infrared receiving tube; infrared rays transmitted by the infrared transmitting tube after optical fiber breakage cannot enter into the infrared receiving tube; the normally closed relay is connected in series in a circuit in which the infrared receiving tube is positioned; the alarm is connected in a circuit controlled by the normally closed relay; when the infrared receiving tube is conducted, the normally closed relay is disconnected from the power supply of the alarm; and when the infrared receiving tube is not conducted, the normally closed relay is connected with the power supply of the alarm, and the alarm instantly starts alarming. The glass anti-theft device is simple in structure, can be installed on common glass, and is low in installation and use costs and good in reliability.

Description

technical field [0001] A glass anti-theft device. Background technique [0002] At present, glass counters are used in department stores, mobile phone stores and jewelry stores, and glass doors are used in many places. However, after the existing glass is broken, the alarm cannot be automatically issued, and the alarm cannot be issued in time when it is robbed or damaged. . Although the existing anti-theft glass with wire mesh has anti-theft function, its production process is more complicated and the price is higher, and if the existing counter is to be used, the glass must be replaced, which costs a lot. Contents of the invention [0003] The invention provides a glass anti-theft device. The device conducts the infrared rays from the infrared emitting tube to the infrared receiving tube through the optical fiber adhered to the lower side of the glass or sandwiched between two layers of glass. When the glass is broken, the optical fiber follows the If it is broken, the ...

AI Technical Summary

Problems solved by technology

[0002] At present, glass counters are used in department stores, mobile phone stores and jewelry stores, and glass doors are used in many places. However, after the existing glass is broken, the alarm cannot be automatically issued, and the alarm cannot be issued in time when it is robbed or damaged.

Although the existing anti-theft glass with wire mesh has anti-theft function, its production process is more complicated and the price is higher, and if the existing counter is to be used, the glass must be replaced, which costs a lot

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