JPH04134596A - Detection device for damage of glass - Google Patents

Abstract

PURPOSE:To securely realize an operation without viewing a device itself by forming a pattern electrode which continues with a transparent conductor on the surface of glass and providing a power source which causes a current to flow in the pattern electrode and a means detecting that the current is interrupted. CONSTITUTION:The continuous linear pattern electrode 2 of the transparent conductor is formed on the surface of glass 1 inserted into a sash 3. The pattern electrode 2 is incorporated in a bridge circuit 11 and output voltage generated from two terminals of the bridge circuit 11 holds an appropriate value. Then, output is prevented from occurring from a comparison circuit 15. When glass is destroyed, the pattern electrode 2 of the transparent conductor is cut with the damage. Thus, the balance of the bridge circuit 11 is lost and output is generated. Then, an alarm generator 16 is driven and an alarm is generated.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a glass breakage detection device that detects breakage of glass such as a glass window or a showcase and issues an alarm.

(Prior technology) In order to prevent theft accidents in which a glass window or the glass of a showcase is broken and a locked key is unlocked to break in or take out products, micro-instruments are installed on window bars, etc. BACKGROUND ART Conventionally, devices have been known that install a switch to detect when a window has been opened and issue an alarm, and devices that issue an alarm by detecting vibrations generated when the glass is broken.

(Problem 8 to be solved by the invention) However, in such conventional theft alarm devices, since the installed detection device can be visually observed, it is easy for the criminal to take measures to prevent the detection device from being activated. Despite this, there were many cases of theft.

Therefore, this invention has been devised to solve the problems of the conventional theft alarm device, and is designed to prevent the installed glass breakage detection device from being visually visible and to ensure that the device is not visible. The goal is to capture working equipment.

(Means for solving the problem) A continuous pattern electrode is formed using a transparent conductor on the surface of the easily broken part of the glass, and a power source that flows current through the pattern electrode, and a means for detecting that the current is interrupted. It is configured to issue an alarm when the glass is broken and the transparent conductor pattern electrode is cut.

(Function) Since the glass breakage detection device itself cannot be visually observed, it is possible to obtain a device that operates reliably without impairing the beauty of the glass.Furthermore, the transparent conductor is an oxide and is chemically free. Since it is a physically and physically stable substance, it has excellent weather resistance, solvent resistance, and abrasion resistance, has a long life, and is easy to maintain.

(Example) As shown in FIG. 1, the glass 1 fitted into the sash 3
A continuous linear transparent conductor pattern electrode 2 is formed on the surface of the locking device 4, particularly on the surface near where the locking device 4 is attached.

As shown in FIG. 2, this pattern electrode 2 is
A comparator circuit 15 that is incorporated in one side of the bridge circuit 11 together with other three resistors 12, 13, and 14 via lead wires connected to both ends thereof, and to which the output of this bridge circuit 11 is applied; The alarm generator 16 is driven by the output of the alarm generator 16.

The pattern electrode 2 of a transparent conductor is formed on the surface of the glass 1 by a method similar to the method of forming a nesa film of tin oxide, indium oxide, etc., which has been conventionally used in the manufacturing process of liquid crystal display devices. can do. Alternatively, a synthetic resin film coated with a thin pattern of conductive tin oxide fine powder may be attached to the surface of the glass 1.

Usually, the pattern electrode 2 made of a transparent conductor is incorporated into the bridge circuit 11 with its resistance value, and the output voltage generated from the two terminals of the bridge circuit 11 maintains an appropriate value, and the output from the comparator circuit 15 is It will never occur.

However, when the glass 1 is broken, the pattern electrode 2 made of transparent conductor is cut due to the breakage, so the bridge circuit 11 loses its balance and generates an output, which drives the alarm generator 16. generates an alarm.

Note that if the series of circuits 5 from the bridge circuit 11 to the alarm generator 16 is constructed to be operated by a battery, it can be incorporated into the cylindrical space of the sash.

(Other Embodiments) In the embodiments described above, the glass 1 is the sash 3.
It is fitted in the crow 1 like a showcase.
When forming a door with a single piece of glass without a frame around the glass 1, as shown in FIG. The bridge circuit 11 shown in FIG. 2 is connected to the bridge circuit 11 shown in FIG.
Incorporate into.

In this embodiment, even if the glass 1 is damaged and the transparent conductor pattern electrode 2 is cut, or if the glass 1 is removed from the TR 18, the bridge circuit 11
The imbalance produces an output that can drive the alarm generator 16 to generate an alarm.

[Brief explanation of drawings]

FIG. 1 is a front view showing one embodiment of the glass breakage detection device of the present invention, FIG. 2 is a circuit diagram of an electric circuit for operating the device of FIG. 1, and FIG. FIG. 3 is a front view showing an embodiment of the damage detection device of FIG. 1...Glass 2...Pattern electrode of transparent conductor 3...Sash 4...Lock device 11...Bridge circuit 15...Comparison circuit 16...Alarm generator

Claims (1)

[Claims] (1) A continuous pattern electrode of a transparent conductor formed on the surface of the glass, and a power source that causes current to flow through the pattern electrode,
A glass breakage detection device comprising a detection means for detecting that the electric current is interrupted.