JPS6289196A - 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 Technical Field The present invention relates to an intrusion alarm device such as a security buzzer that detects the opening and closing of doors, windows, etc. at the time of intrusion and issues an alarm to notify household members of intrusion.

<Prior Art> A conventional intrusion alarm device will be explained with reference to FIGS. 4 and 5. Fourth
The figure shows a block diagram, and FIG. 5 shows an electronic circuit diagram, and the intrusion alarm device is composed of a detection circuit Bll, a latch circuit B12, an oscillation circuit B13, and an alarm circuit B14 (buzzer circuit). In other words, the intrusion alarm device is an intrusion alarm switch S that is installed near a door or window and is turned on when alerting.
A detection circuit B has an intrusion sensor SW1 consisting of W 3 , 3 W 4, and a reed switch that automatically operates (turns OFF) when a door or window is opened (when a burglar enters).
ll, and the intrusion warning switch SW3. An alarm circuit B14 is provided which sounds (turns ON) based on a signal from the latch circuit B12 when the intrusion sensor SWI is activated when SW4 is in the ON state.

In FIG. 5, the power switch (not shown)
When the switch is turned on, the intrusion warning switch SW3, SW4
Since it is in the off state, input terminals 1 and 2 of NAND data (Nl2) are "L", output terminal 3 is "H",
Therefore, the output terminal 3 of NAND date N11 is “L”
”, and the oscillation circuit B13 does not operate (provided that the windows and doors are closed and the intrusion sensor SWI is short-circuited (ON)). Normally, it is in a standby state (intrusion warning switch SW 3
, SW4 is in the large state and the intrusion sensor SW1 is short-circuited), the base of the transistor Q5 is "L", so the transistor Q5+1OFFt7. ”),
Sitakatchi, NAND day) Nil input terminal 1 is “H”
”. At this point, the window or door is opened and the intrusion sensor SW1 is activated.
When the transistor Q5 becomes open (OFF), the base of the transistor Q5 becomes "H", which turns on and the input terminal 1 of the NAND date N11 becomes "L" and the output terminal 3 becomes "H".Then, the oscillation circuit B13 is activated. Alarm circuit B14
The driving transistor Q4 is turned on, and the buzzer BZI of the alarm circuit B14 intermittently sounds in accordance with the cycle of the oscillation circuit B13.

That is, although the alarm circuit B14 emits a beeping sound,
When transistor Q4 turns OFF, current no longer flows through alarm circuit B14 and buzzer BZI stops. Oscillation circuit B
When the input terminal 2 of NAND date N13 is "L", the output terminal 3 of NAND date N14 is also "L", transistor Q4 is OFF, and therefore the buzzer does not sound.

However, when the input terminal 2 of the NAND data N13 becomes "H", the oscillation circuit B13 to which positive feedback is applied by the capacitor C6 oscillates at a slow cycle, and sounds or stops the buzzer BZI.

Here, intrusion warning switches SW 3 and SW 4
When you turn off the input terminal 2 of the NAND game)
changes from “H” to “L”, output terminal 3 is “H”, NA
Output terminal 3 of ND gate N11 becomes "L". Therefore, the oscillation circuit B13 stops operating, and the alarm circuit B1
4 buzzer BZI will stop immediately.

However, the intrusion alarm device having the above configuration has the following problems.

(1) Even if a thief breaks in and the alarm sounds, if the thief immediately turns off the intrusion warning switches SW3 and SW4 near the door or window after the intrusion, the alarm will stop immediately and the householder will not notice. Sometimes there isn't.

(2) Furthermore, the shorter the time from the ringing to the turning operation, the greater the possibility of this happening.

(3) Therefore, it cannot be said to be sufficiently safe in terms of crime prevention.

Purpose The present invention has been made to solve the above problems, and even if the intrusion warning switch is turned from "on" to "off" immediately when the alarm is activated, it will continue to operate for a certain period of time. The object of the present invention is to provide an intrusion alarm device that cannot be deactivated until after the intrusion alarm device has been used.

<Example> Hereinafter, a first example according to the present invention will be described based on FIGS. 1 and 2.

Fig. 1 is a block diagram of the intrusion alarm device, and Fig. 2 is an electronic circuit diagram of the intrusion alarm device. Detection circuit B1 having an intrusion sensor SWI consisting of a switch SW2 and a reed switch that automatically operates (turns OFF) when a door or window is opened (when a burglar enters).
and an alarm circuit B4 that sounds (turns on) based on a signal from a latch circuit B2 when the intrusion sensor SW1 is activated when the intrusion warning switch SW2 is in a large state, and the alarm circuit B
Even if the intrusion warning switch SW2 is turned off during the operation of step 4 (immediately after the burglar enters), the alarm circuit B4 stops ringing only after a certain period of time has elapsed from the start of the operation of the intrusion sensor SW1.The delay circuit B6 is the latch circuit. It is installed in B2.

Note that B3 is an oscillation circuit, and B5 is an ED display circuit for warning display. The pond is similar to Figures 3 and 4.

In Figure 2, when the power is turned on, the 7-lip 70-tub circuit I
The input terminal 4 of C2 is "H" during the time constant determined by the capacitor C13 and the resistor R25, and the output terminal 1 is "L", and the warning display LED1 does not light up.Furthermore, the flip-flop circuit IC2 is a JK7 flip-flop circuit. It has 70 knobs and functions to count whether the number of times it has been turned on is an even number or an odd number. Here, capacitor C12 and resistor R24
Intrusion warning switch SW with anti-chattering measures
When 2 is pressed, the output terminal 3 of NAND gate N2 becomes “H”
Since the output terminal 3 of A2 also becomes "H", the output terminal 1 of the 7 lip-flop circuit IC2 becomes "H".
Then, the warning display light emitting element LEDI lights up to enter the warning mode. When a burglar enters through a window or door and the intrusion sensor SW1 detects an abnormality, transistor Q5 turns on, so the NAND gate) Nl
The input terminals 1 and 2 of the NAND gate N1 are "H", and the input terminal 2 of the AND gate N1 is "H", so the output terminal 3 of the AND gate N1 is "H".
becomes “H”, oscillation circuit B3 operates, and alarm circuit B
4 is activated and the buzzer BZI sounds intermittently. At the same time, input terminal 4 of monostable multivibrator ICI is also “H”
Therefore, the output terminal 7 becomes "L" for a certain period of time determined by the resistor R23 and the capacitor C1l. During this period (for example, 2 to 5 minutes), no matter how hard the intruder tries to turn off the intrusion warning switch SW2 and the thief presses it, the A2 input terminal 1 is "L", so the input terminal 3 of the 7-lip 70-tub circuit C2 is " remain at L”, therefore 7 rip 70
The output terminal 1 of the tube circuit IC2 remains at "H" (warning mode), the transistor Q6 is turned on, and the LEDI is lit. Then, after a certain period of time has elapsed since the opening operation of the intrusion sensor SW1, the output terminal 7 of the monostable multi-by-break ICI becomes "H", so the warning display LED turns on and off repeatedly every time the intrusion warning switch SW2 is pressed. That is, in this embodiment, even if the intrusion warning switch is immediately turned from "on" to "off" when the alarm is activated, the operation cannot be stopped until after the alarm has continued to operate for a certain period of time.

Next, a second embodiment of the present invention will be explained with reference to FIG. 3. In this example, an OR gate ORI is added to the latch circuit B2 in order to use change-over type interlocking switches 5W2a and 5W2b similar to those in the conventional device as the intrusion prevention switch. Along with adding
In the first embodiment, the intrusion sensor 5WI (reed switch)
When the window is open (OFF), that is, when an intruder enters, the alarm circuit B4 operates, but if the window is closed and the intrusion sensor SW1 is short-circuited (ON), the alarm circuit B4 will not operate. NAND day) N11,
A NAND gate N12 is added to the latch circuit B12. The other configurations are the same as those of the first embodiment.

It should be noted that the present invention is not limited to the above embodiments, and it goes without saying that many modifications and changes can be made to the above embodiments within the scope of the present invention. For example, the delay circuit may include a capacitor and a resistor. Alternatively, the output of the oscillation circuit may be counted by a counter, and the alarm may be stopped only when the alarm time reaches a predetermined time.

Effects> As is clear from the above description, the present invention provides a detection circuit having an intrusion warning switch, an intrusion sensor that automatically operates when a door or window is opened, and a detection circuit that detects an intrusion when the intrusion warning switch is in the ON state. An intrusion alarm device comprising an alarm circuit that operates based on a signal from a latch circuit when a sensor operates,
The invention relates to an intrusion alarm device, characterized in that the latch circuit is provided with a delay circuit that stops the operation of the alarm circuit only after a certain period of time even if the intrusion alarm switch is turned off when the alarm circuit is operating. be.

Therefore, according to the present invention, (1) When a burglar enters and the alarm is activated, the burglar cannot stop the operation even if the burglar immediately turns off the intrusion warning switch, and it always remains activated for a certain period of time.

(2) Therefore, it is extremely safe in terms of crime prevention.

It has such excellent effects.

[Brief explanation of drawings]

FIG. 1 is a block diagram of a first embodiment of the intrusion alarm device of the present invention, FIG. 2 is an electronic circuit diagram of the same intrusion alarm device, and FIG. 3 is an electronic circuit diagram of a second embodiment of the intrusion alarm device of the present invention. FIG. 4 is a block diagram of a conventional intrusion alarm device, and FIG. 5 is a similar electronic circuit diagram. B1: detection circuit, B2: latch circuit, B3: oscillation circuit,
B4: Alarm circuit, B5: LED display circuit for warning display,
B6: Delay circuit, swi: Intrusion sensor, SW2, 5W
2a, 5W2b: Intrusion warning switch, IC1: Monostable multivibrator, IC2: Flip-flop circuit.

Claims (1)

[Claims] A detection circuit having an intrusion warning switch and an intrusion sensor that automatically operates when a door or window is opened; and an alarm circuit that operates based on a signal from a latch circuit when the intrusion sensor is activated with the intrusion warning switch in an on state. In the intrusion alarm device, the latch circuit is provided with a delay circuit that stops the alarm circuit from operating only after a certain period of time even if the intrusion alarm switch is turned off when the alarm circuit is operating. Intrusion alarm system.