JPS6367230B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a security alarm device with an improved means for setting alarms especially when going out.

When using a security alarm to monitor a home while the user is away, it is necessary to set up precautions when the user goes out, that is, to monitor the home while the user is away. However, with conventional burglar alarms, when setting up home monitoring when you are out, you wire a dedicated line to your front door or back door, and use a special key to switch it on.
Alternatively, a method is used in which an alarm is set via a timer with a holding time of several tens of seconds before going out, and the alarm is then set in a state of alarm by going outside within the holding time.

However, the former method described above requires a dedicated line and a dedicated switch and key, while the latter method requires a timer that restricts human behavior and requires the timer itself to be highly accurate. There's a problem.

The present invention has been made in view of the above points, and an object of the present invention is to provide a crime prevention alarm that can be reliably and easily set to a warning state using an entrance intercom without requiring a dedicated line or a dedicated switch. With the goal.

An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is a sensor circuit in which door lock sensors S ₁ , S ₂ , and S ₃ are connected in series, and the series circuit is connected to terminals 3 a and 3 b of the alarm body 2 . The door lock sensors S ₁ , S ₂ , and S ₃ are provided for each door, and are composed of switches that are normally on and turn off when the door is opened. And the terminal 3 of the alarm main body 2
b is grounded, and terminal 3a is the preset switch.
It is connected to one input terminal of the AND circuit 4 via _SW1 . In addition, a resistor is connected between the terminals 3a and 3b.
A DC power source 5 is supplied via R ₀ . and,
The positive terminal of the DC power supply 5 is connected to the preset switch.
It is connected to the reset terminal R of the holding circuit 6 via _SW2 . The preset switch SW ₂ is connected to a hidden reset switch BS via terminals 7a and 7b.
are connected in parallel. The set terminal S of the holding circuit 6 is connected to the terminal ₈ via a preset switch SW3. Further, the DC power supply 5 is connected to the terminal 9 and is supplied to the warning sound generating circuit ₁₀ via the preset switch SW4. The preset switches SW ₁ to _{SW 4} mentioned above are designed to switch in conjunction with each other, and under normal conditions, SW ₁ , SW ₃ , and SW ₄ are off.
SW ₂ is in the on state, and when a preset operation is performed, SW ₁ , SW ₃ , and SW ₄ are switched on, and SW ₂ is switched to the off state. The above-mentioned warning sound generating circuit 10 is
It generates a warning sound signal by being supplied with a DC power supply 5, and its output end is connected to a switch circuit.
It is connected to terminal 11 via AS ₁ and AS ₂ . The above switch circuit AS ₁ is connected from the holding circuit 6 to the inverter 1.
The switch circuit AS ₂ is controlled on/off by a signal applied from the DC power supply 5 via the preset switch SW ₄ . Further, the output of the holding circuit 6 is input to the AND circuit 4, and the output is sent to the alarm sound generating mechanism 13 as a drive signal. The alarm sound generating mechanism 13 is composed of, for example, a buzzer or an electronic sound generating circuit, a speaker, and the like.

Thus, in the alarm main body 2 configured as described above, an external circuit, that is, an intercom is connected to the terminals 8, 9, and 11. This intercom is equipped with an entrance intercom handset 21. In this entrance intercom handset 21, a call switch CS is connected between terminals 22a and 22b via a resistor _R1 , and an intercom circuit consisting of a microphone 23, an amplifier 24, a low frequency transformer 25, a speaker 26, etc. is connected. Ru. Terminals 22a and 22b of the intercom slave unit 21 are connected to terminals 32a and 32b of the intercom base unit 31. This intercom base unit 31 includes, for example, a transmitter 33 using a speaker, a receiver 34, a low frequency transformer 35, an amplifier 36, and a switch _FS1 to
FS ₃ , variable resistor 37 for volume adjustment (ring tone),
It consists of a ring detection circuit 38, a ring tone generation circuit 39, a resistor _R2, etc., and one end of the transformer 35 is connected to the one terminal 32a. The other terminal 32b is grounded. Further, the resistor R ₂ is provided between the midpoint of the child unit connection side winding of the low frequency transformer 35 and the terminal 9 of the alarm main body 2. Furthermore, a hook switch is connected to the resistor _R2 above.
SF ₃ are connected in parallel, and one end thereof is connected to the call detection circuit 38. This call detection circuit 38 detects the voltage drop that occurs in the resistor R ₂ when the call switch CS of the intercom handset 21 is closed, and the detection signal is sent to the ring tone generation circuit 39. Alarm body 2
is input to terminal 8 of In addition, the terminal 11 of the alarm body 2 is connected to the terminal 32a of the intercom master device 31.
connected to.

Next, the operation of the above embodiment will be explained. Under normal conditions, that is, when the alarm is not set, the preset switches SW ₁ to _{SW 4} are set to SW ₁ ,
SW ₃ and SW ₄ are off, and SW ₂ is on. Therefore, the DC power supply 5 is supplied to the reset terminal R of the holding circuit 6 through the switch _SW2 , and the holding circuit 6 is reset. At the time of reset, the holding circuit 6 outputs "0" and closes the gate of the AND circuit 4. For this reason, door lock sensor S ₁
The output of the AND circuit 4 is held at "0" regardless of the operation of ~ _S3 , and the alarm sound generating mechanism 13 does not operate. Further, since the preset switch SW ₄ is turned off, the supply of the DC power supply 5 to the warning sound generation circuit 10 is cut off, and no warning sound is generated. When the call switch CS of the intercom handset 21 is closed in the above state, a current flows from the DC power supply 5 to the ground via the resistor _R2 , the low frequency transformer 35, and the resistor _R1 .
Ringing detection circuit 38 due to voltage drop across resistor _R2
input voltage decreases. This ring detection circuit 3
8, the call switch is activated by a drop in input voltage.
It detects that the CS has been operated and outputs a ringing detection signal to the ringing tone generation circuit 39. As a result, the ringing tone generating circuit 39 operates to generate a ringing tone signal, which is output to the transmitter 33 via the hook switch FS ₂ , the amplifier 36, the hook switch FS ₁ and the variable resistor 37, thereby generating a ringing tone. Further, the detection signal outputted from the ringing tone detection circuit 38 is inputted to the terminal 8 of the alarm body 2, but is not sent to the holding circuit 6 since the preset switch _SW3 is turned off. As described above, in normal times, after a call is made, the handsets 33, 34 are picked up to switch the hook switches _FS1 to _FS3 , and the base unit 31 and the handset 21 become ready for communication. As mentioned above, in normal times, only the calling operation is performed by operating the calling switch CS, and no alarm sound is generated even if the door lock sensors _S1 to _S3 operate. Therefore, the door can be opened and closed freely.

Therefore, when setting the alarm when going out, the user first switches the preset switches _SW1 to _SW4 to turn _SW1 , _SW3 , and _SW4 on and _SW2 off. Above preset switch SW ₁ ~
When SW ₁ is turned on by operating SW ₄ , the sensor circuit 1 is connected to the AND circuit 4, and when SW ₂ is turned off, the reset input to the holding circuit 6 is cut off. Furthermore, when the switch SW ₃ is turned on, the terminal 8 is connected to the holding circuit 6, but at this point, the ringing detection circuit 38 is not outputting a ringing detection signal, so the holding circuit 6 is held in the reset state. . When this holding circuit 6 is reset, its "0" output signal is inverted to "1" by the inverter 12 and input to the switch circuit _AS1 , so that the switch circuit _AS1 is in an on state. moreover,
When the switch SW ₄ is turned on, the DC power source 5 is supplied to the switch circuit AS ₂ and the warning sound generating circuit 10. Therefore, the switch circuit _AS2 is turned on, and the warning sound generating circuit 10 outputs a warning sound signal. This warning sound signal is a switch circuit
The signal is output from the terminal 11 via AS ₁ and AS ₂ , and is further sent from the terminal 32 a of the intercom base unit 31 to the intercom slave unit 21 to drive the speaker 26 . In this way, the speaker 26 is driven by the warning sound signal from the warning sound generating circuit 10, and the warning sound is generated. In addition, as described above, the holding circuit 6
is maintained in the reset state, the output of the AND circuit 4 is also "0" regardless of the operation of the door lock sensors _S1 to _S3 , and the alarm sound generating mechanism 13 is
is held inactive. Therefore, in this state, no alarm sound is generated even if the door to which the door lock sensors S ₁ to _{S 3} are attached is opened or closed and the user goes outside. Then, after going outside and making sure that each door is closed,
Operate the call switch CS of the intercom handset 21. When you operate this call switch CS,
The ringing detection circuit 38 operates to output a ringing detection signal, and the ringing tone generating circuit 39 generates a ringing tone signal to drive the transmitter 33. Further, the call signal output from the call detection circuit 38 is inputted to the set terminal S of the holding circuit 6 via the terminal 8 and the preset switch _SW3 , and sets the holding circuit 6. As a result, the output of the holding circuit 6 becomes "1" and the output of the inverter 12 becomes "0", turning off the switch circuit _AS1 . Therefore, the warning sound signal output from the warning sound generating circuit 10 is blocked by the switch circuit _AS1 , and until then the warning sound signal is output from the speaker 26.
The warning sound that was being output from the machine will stop. Further, since the "1" output of the holding circuit 6 is input to the AND circuit 4, the alarm enters the alert state.

However, in the above alert state, if the door is opened by an external intruder, the door lock sensor S ₁ ~
When _S3 is activated, the terminal 3a of the alarm body 2 is disconnected from the ground, and the potential of the terminal 3a is raised to the "1" level by the DC power supply 5. Since the potential of this terminal 3a is supplied to the AND circuit ₄ via the preset switch SW1, the logic condition of the AND circuit 4 is established at the same time as the door lock sensors _S1 to _S3 are activated, and the AND circuit 4 outputs "1". "A signal is output and sent to the alarm sound generating mechanism 13. This activates the alarm sound generating mechanism 13 and issues an alarm.

Next, set it to the alert state, and when you return home from an outing, set it in a place where it is difficult for others to see or operate the hidden setting switch BS to cancel the alert state. That is, when the reset hidden switch BS is operated, the contacts of the switch SW ₂ which is in the OFF state are short-circuited by the hidden switch BS, and the DC power supply 5 is connected to the reset terminal R of the holding circuit 6.
is supplied to As a result, the holding circuit 6 is reset, its output becomes "0", and the gate of the AND circuit 4 is closed. Therefore, after that, the door lock sensor
Even if S ₁ to S ₃ operate, the output of AND circuit 4 is “0”
This state is maintained, and the alarm sound generating mechanism 13 does not operate. Then, after resetting the holding circuit 6 by operating the hidden reset switch BS as described above,
Open the door, enter the room, and press the preset switch SW _1.
~ Operate SW ₄ to return to normal state, that is, SW ₁ ,
Turn off SW ₃ and SW ₄ and return SW ₂ to on. After the preset switches _SW1 to _SW4 are switched to the normal state, the holding circuit 6 is not set even if the call switch CS is operated, and the door can be opened and closed freely without issuing an alarm.

In the above embodiment, the reset hidden switch BS
However, as shown in FIG. 2, the output of the AND circuit 4 is connected to the alarm sound generating mechanism via a delay circuit 41 having a delay time of several tens of seconds or several minutes. By configuring the signal to be supplied to 13, the hidden reset switch BS can be made unnecessary. That is, when the door is opened on the way home, the door lock sensors _S1 to _S3 are activated and a "1" signal is output from the AND circuit 4, but the preset switches _SW1 to _SW4 are activated within the set time of the delay circuit 41. By switching, the function of the alarm sound generation mechanism 13 can be stopped before the alarm sound starts sounding.

Further, in the above embodiment, the alarm device is provided with the DC power source 5, but it goes without saying that the DC power source provided in the intercom may be used.

As described above, according to the present invention, it is possible to set an alarm using the call switch of the entrance intercom, and there is no need for a dedicated line or a dedicated switch. Also, a warning sound is generated when the alarm is preset, and the warning sound is stopped when the setting operation is completed.
It can be confirmed by the warning sound that the alarm has been set, and setting errors can be reliably prevented.

[Brief explanation of drawings]

FIG. 1 is a circuit configuration diagram showing an embodiment of the present invention;
FIG. 2 is a circuit diagram showing another embodiment of the present invention. 1...Sensor circuit, 2...Alarm body, 6...
...Holding circuit, 10...Caution sound generation circuit, 13...
Alarm sound generation mechanism, 21... Intercom handset, 3
1... Intercom base unit, 41... Delay circuit, S ₁
~ _S3 ...door lock sensor, BS...hidden reset switch, _SW1 ~ _SW4 ...preset switch, _AS1 , _AS2 ...switch circuit.

Claims (1)

[Claims] 1. A door lock sensor that detects the open state of the door;
A holding circuit having a reset mechanism, a logic circuit into which the outputs of the door lock sensor and the holding circuit are input, a preset switch that enables at least setting input to the holding circuit, and a preset operation of the preset switch. Therefore, a warning sound generation circuit generates a warning sound signal and sends it to an intercom handset installed outdoors, and a warning sound generation circuit that generates a warning sound signal and sends it to an intercom handset installed outdoors. Means for setting the holding circuit and stopping the generation of the warning sound by operating a call switch of the machine; and generating an alarm sound operated by the output of the logic circuit when the door lock sensor is activated in the set state of the holding circuit. A security alarm characterized by comprising a mechanism. 2. The security alarm according to claim 1, wherein the output of the AND circuit is delayed by a predetermined time by a delay circuit and then supplied to the alarm sound generating mechanism.