JPS6249495A - Invasion alarm - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial Application Field> The present invention relates to an intrusion alarm device for crime prevention that detects the opening and closing of doors, windows, etc. and generates an alarm sound to notify of intrusion by a suspicious person.

<Conventional technology> FIG. 3 shows a basic block diagram of this type of device.

In the figure, reference numeral 1 denotes an intrusion sensor, such as a reed switch, which is attached to the fixed side of an opening/closing part such as a door or window, and opens and closes according to the movement of a magnet attached to the movable side. 2 is intrusion sensor 1
This is an intrusion warning switch that switches the mode from ON to OFF, and when it is turned ON, the device enters a standby state. Here, when the intrusion sensor 1 operates and an intrusion is detected, the detection circuit 3 detects this and operates the latch circuit 4, and the oscillation circuit 5 oscillates. Then, the notification circuit 6 issues an alarm such as a buzzer to notify that there has been an intrusion.

<Problems to be Solved by the Invention> In the case of the above method, even if an intrusion is detected and an alarm sounds, the alarm stops immediately when the intrusion warning switch is turned OFF. Therefore, if the intrusion warning switch is set to 0FFI by an intruder, fewer people will notice the alarm sound, and especially if the time until oFFa is set is short, there is a high possibility that no one will notice. There are cases where it is not safe.

The present invention has focused on this point, and has been made with the aim of increasing security in terms of crime prevention by not immediately stopping the alarm sound even if the intrusion warning switch is turned off.

Means for Solving the Problems> In order to achieve the above object, the intrusion alarm device of the present invention operates the alarm circuit for a predetermined time even if the intrusion alarm switch is turned off when an intrusion is detected by the intrusion sensor. It is characterized by the provision of a delay circuit that continues to

<Function> Even if the intrusion warning switch is turned off, the alarm circuit does not stop immediately due to the delay circuit, and the alarm continues to sound for a predetermined period of time, increasing the effectiveness of the alarm and improving security in terms of crime prevention. .

<Example> The example shown in FIG. 1 and FIG. 2 will be described below.

FIG. 1 is a block diagram, and the same parts as in FIG. 3 are designated by the same reference numerals. 7 is a delay circuit that holds the output signal of the latch circuit 4 for a certain period of time and outputs it to the oscillation circuit 5, so that even if the intrusion warning switch 2 is turned OFF and the output signal of the latch circuit 4 disappears, , for a predetermined period of time, sends an output signal to the oscillation circuit ≦ to cause the oscillation circuit 5 to continue oscillating.

The specific configuration of each circuit in FIG. 1 is not limited to a specific circuit configuration, and various well-known circuits can be used, an example of which is shown in FIG. 2.

The intrusion sensor 1 using a reed switch is connected to a power supply vb via a resistor R22 and one changeover switch 2a of the intrusion warning switch 2, and the connection point with the resistor R2□ is a transistor Q. It is connected to the base of 5. 14a, 14b
are NAND circuits that configure a latch circuit by feeding back their outputs to each other, and transistor Q. The collector of No. 5 is connected to the power supply vb through a resistor R21, and to the input pin T of the NAND circuit 14a through a resistor R20.
, are connected to each other. In addition, the input bin T6 of the NAND circuit 14b is connected to the power supply vb via a resistor R19, and is also connected to the other interlocking changeover switch 2b of the intrusion warning switch 2, so that the intrusion warning switch 2 is turned off.
It is designed to be grounded when switched to the F side.

The delay circuit 7 includes a diode 1'D02 and a resistor R161R1.
This is a charging/discharging circuit consisting of a combination of a capacitor C87 and a capacitor C87, and the output signal of the output pin T of the NAND circuit 14a is a diode D. 2, and the terminal voltage of capacitor C87 is input to NAND circuit 1 via resistor R1G.
5a input bin T1. is input. NAND circuit 15
a is the NAND circuit 15b and the resistor Rl 41 Rl
5. An oscillation circuit is configured in combination with a capacitor C66, etc., and the output pin T to of the NAND circuit 15b is connected to a transistor Q via a resistor R13. , connected to the base of.

16 is an electronic buzzer, which is a transistor Q; 2, resistor R8, +Ro6rRor, capacitor C81, etc. constitute an alarm circuit, and when transistor QO4 becomes conductive, it becomes operational and oscillates, producing an alarm sound.

Next, the operation will be explained. The reed switch of the intrusion sensor 1 is a make contact type that shorts when a magnet approaches.As shown in the figure, in the standby state when the intrusion warning switch 2 is switched to the ON side, the transistor Q is switched on. , are non-conductive, the input pin T1 of the NAND circuit 14a is at the rHJ level, the output pin T3 is at the rLJ level, and the oscillation circuit does not operate.

Here, when there is an intruder and the intrusion sensor 1 opens, the transistor Q. 5 becomes conductive and the input bin T1 becomes “L”.
” level, and the output pin T3 becomes rHJ level.

This output signal is sent to the delay circuit 7 to charge the capacitor COt, and at the same time, the capacitor 7T+1 of the NAND circuit 15a becomes rHJ level and oscillates, causing the transistor Q. 4 repeats conduction in accordance with the oscillation cycle, the notification circuit operates, and the electronic buzzer 16 emits an alarm sound intermittently.

When the intrusion warning switch 2 is switched to the OFF side by the dog in this state, the input bin T6 of the NAND circuit 14b is grounded and becomes the rLJ level, and the output bin T3 of the NAND circuit 14a becomes the rLJ level. However, the input bin T13 of the NAND circuit 15a is maintained at the group level due to the charging voltage of the capacitor C87, and the oscillation of the oscillation circuit continues. Then, the charge in the capacitor C67 is discharged through the resistor Rl7, and when it reaches a certain level, the oscillation stops and the alarm sound emitted from the electronic buzzer 16 also stops. In other words, even if the intrusion warning switch 2 is turned off by an intruder, the alarm will continue to sound for a predetermined period of time determined by the discharge characteristics of the capacitor C8, resulting in a high crime prevention effect. is obtained.

In the example, a magnetic type, make contact, α type reed switch is used as the intrusion sensor, but intrusion sensors can include break contact type reed switches, as well as infrared type and equal point type intrusion sensors. You can also use In addition, although a charging circuit consisting of a resistor and a capacitor is used as a delay circuit, this may be used as a circuit of other types, and its insertion point may also be between the latch circuit and the oscillation circuit as in the example. It is not limited to this, and can be provided as appropriate depending on the circuit configuration of the entire device.

<Effects of the Invention> -As is clear from the description of the embodiment described in L, the intrusion alarm device of the present invention has a delay circuit that prevents the notification circuit from turning off even if the intrusion alarm switch is turned OFF when an intrusion is detected. The system continues to operate for a predetermined period of time. Therefore, the alarm sound does not stop immediately, but continues to sound for a predetermined period of time, thereby increasing the crime prevention effect of the intrusion alarm device and improving security in terms of crime prevention.

[Brief explanation of the drawing]

FIG. 1 is a block diagram of an embodiment of the present invention, and FIG. 2 is a block diagram of an embodiment of the present invention.
3 is a block diagram of a conventional example. 1... Intrusion sensor 2... Intrusion warning switch 6... Notification circuit 7... Delay circuit 16... Electronic buzzer

Claims (1)

[Claims] (1) In an intrusion alarm device that includes an intrusion sensor, an alarm circuit that emits an alarm sound when the intrusion sensor detects an intrusion, and an intrusion warning switch that turns ON/OFF the operation of the intrusion sensor, the intrusion warning device An intrusion alarm device characterized by being provided with a delay circuit that keeps an alarm circuit operating for a predetermined period of time after a switch is turned off.