JPS6017031Y2 - security device - Google Patents

Description

[Detailed description of the invention] This invention relates to a crime prevention device, and its purpose is to provide a crime prevention device with a simple structure and reliable operation that can detect the opening and closing of windows as well as the breaking of window glass. It is something to do.

An embodiment of the present invention will be described below with reference to FIGS. 2 and 3. Reference numeral 1 denotes a window frame, and a glass window 2 is fitted into the window frame 1. FIG.

3 is the detector attached to the window frame 1 or the glass frame 4 of the glass window 2, 5 is the lead wire with one end connected to the detection device in the detector 3, and 6 is the connector connected to the other end of the lead wire 5. 7 is a relay having a socket for the connector insertion frame 6, 8 is a lead wire connected to the relay 7, and 9 is a magnet mounted on the glass of the glass window 2.

In the present invention, as described above, the magnet 9 is fixed directly on the glass of the glass window 2, and the detector 3 is fixed to the glass frame 4 of the glass window 2 or the window frame 1 within the range affected by the magnetic force of the magnet 9. Therefore, changes in the magnetic field caused by vibrations of the magnet 9 due to glass breakage or movement due to the opening and closing of the glass window 2 actuate the magnetic sensing device in the detector 3 and are converted into changes in electrical signals, causing the amplification circuit 10 to The expanded signal then flows into the detection circuit 11.

The alternating current component of the signal that has entered the detection circuit 11 is sent to the filter circuit 12, and from among the alternating current changes, only the high frequency signal that is characteristic of glass breakage is identified by this filter circuit and passed through an integrating circuit. When the signal reaches a predetermined level or higher, an output signal is output from the switching circuit A13.

Further, the DC change caused by the movement of the magnet 9 passes through the detection circuit 11, and when the change exceeds a predetermined level, an output signal is output from the switching circuit B14.

The alarm device is actuated by the output from the switching circuit A13 and the switching circuit B14, and if a difference is made between each alarm device, it will be possible to determine whether it is caused by glass breakage or the opening of the glass window 2. can be easily identified.

As shown in FIG. 1, the conventional security switch of this type has a glass breakage detector 3' fixed on the glass surface of the glass window 2.
The lead wire 5 connected to this is connected to the repeater 7 via the connector 6, and a magnet 9 is fixed to the glass frame 4 of the glass window 2, and the security switch 3 is attached to the window frame 1 within the magnetic field of the magnet 9. '' and the lead wire 5 connected to it is connected to the repeater 7. In this way, the vibration of the glass at the time of glass breakage is transmitted to the glass breaker 3'.
Therefore, the movement of the magnet 9 due to the opening and closing of the window had to be detected separately by the security switch 3'', which required time and effort for the number of products, equipment, and adjustment, which was extremely disadvantageous economically. .

However, in the security device of the present invention, as described above, the magnet 9 is fixed on the glass surface, and the detector 3 installed in the magnetic field of the magnet 9 detects the change in the magnetic flux of the magnet 9, thereby preventing the glass from breaking. This system separates the high-frequency signal caused by the movement of the glass window and the DC change signal caused by the movement of the glass window to activate each alarm device, and is practical in terms of simple structure and reliable operation.

[Brief explanation of drawings]

FIG. 1 is an installation diagram of a conventional security device of this type, FIG. 2 is an installation diagram of the security device of the present invention, and FIG. 3 is an operating circuit diagram thereof.

Claims (1)

[Scope of utility model registration request] A magnet 9 fixed on the glass surface of a glass window 2 inserted into the window frame 1 so as to be openable and closable, a detector 3 fixed to the window frame 1 or the glass frame 4 within the magnetic field of the magnet 9, and the detector a signal separation circuit that separates the detection signal No. 3 into a high frequency signal due to the glass breakage of the magnet 9 and a DC change signal due to the movement of the magnet 9; and an output of the high frequency signal and the DC change signal of the signal separation circuit at a predetermined level or higher. A crime prevention device consisting of an alarm device that activates when the following occurs.