JPS6133593A - Crime preventor - 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 of the Invention] The present invention relates to a crime prevention device in which a sensor is attached to a window or door to detect the open state thereof, and a crime prevention alarm is issued based on a detection signal from the sensor.

[Technical background of the invention and its problems]

BACKGROUND ART Some conventional crime prevention devices include sensors that detect the open state of windows and doors and issue an alarm when the windows and doors are opened due to intrusion from the outside.

With this type of device, if you want to set the security device even when you are out, the alarm will go off when you leave the entrance or return home after setting the security device, so a timer circuit is installed to activate the sensor. It is common to configure the circuit so that it does not accept for a certain period of time.

However, according to the crime prevention @ station which has such a timer circuit, the time set in the timer circuit elapses while the security device is set to go out and preparations are made to go out, and the alarm is activated when leaving the front door. It had the disadvantage that it would come out. Similarly, when you return home, if the time set in the timer circuit has elapsed by the time you enter the house through the front door and go to the location where the security device is installed, where the switch for the spinner Wl. There was a drawback that υ information was published.

[Purpose of the invention]

The present invention has been made in order to eliminate the drawbacks of the prior art as described above, and an object of the present invention is to provide a simple and accurate crime prevention device that does not issue an alarm at the time of going out or returning home.

[Summary of the invention]

In order to achieve the above object, the present invention is suitable for windows and doors.
a series-connected sensor group for detecting the open/closed states of the sensors; a switch for setting and resetting the crime prevention state; and a switch for storing the setting and resetting operations by the switch and short-circuiting the set signal and the sensor group. a memory circuit that outputs a reset signal; a first timer circuit that is activated by the set signal of the memory circuit and outputs a signal to short-circuit the sensor group after a set time; and a short-circuit state of the sensor group and the window. a sensor operation detection circuit that detects the release of a short-circuit condition by opening the door or the door; and a second timer that operates when a short-circuit condition release detection signal is given from the sensor operation detection circuit and outputs an alarm signal after a set time. The present invention is characterized in that a terminal for connecting another switch is provided in parallel with the switch.

Embodiment of the Invention] Hereinafter, an embodiment of the present invention will be explained with reference to the drawings.

The drawing is a circuit configuration diagram of the security device. In the figure, 1 is a non-locking switch having a normally closed contact, and this switch 1 is used to set and reset the security device. A terminal block 2 is provided in parallel with the switch 1, and another non-locking switch 3 having a normally closed contact is connected thereto. A grounded resistor 4 is connected in series with the switches 1 and 3, and a control voltage oD is applied through the switches 1 and 3. A series circuit of a capacitor 5 and a resistor 6 is connected in parallel with the switch 1 and the resistor 4, and a non-locking alarm stop switch 7 having a normally closed contact is connected in parallel with the capacitor 5. , 8 is a memory circuit for storing the set operation and reset operation by the switch 1, for example, a D flip 70 tube (hereinafter referred to as D-FF), and this D-FF 8 is connected to the connection point of the switch 1 and the resistor 4. a clock pulse input terminal CP, a clear input terminal CL connected to the alarm stop switch 7, a delay input terminal D, a positive output terminal Q, a negative output terminal Q connected to the delay input terminal for toggle operation, and has a grounded preset terminal PR,
When a pulse is input to the terminal CP, the D input is held until the next pulse is input, and it is output from the terminal Q. Terminal Q
The base of a transistor 10 is connected to the transistor 10 through a resistor 9, and lighting control of a security set lamp 11 connected to the collector side of the transistor 10 is performed. Also D-
The base of a transistor 14 is connected to the terminal Q of the FF 8 via a timer circuit 12 and a resistor 13, and a relay 15 connected to the collector side of the transistor 10 is driven. Further, a control voltage ■ is applied to the terminal Q of the D-FF8 through a reverse diode 16. The connection point between the resistor 17 to which 0 is applied and the grounded sensor group 18 is connected. The sensor group 18 consists of a plurality of serially connected sensors, each of which is attached to a window or door to detect their open status. Resistor 17 and sensor group 18
The connection point is connected via a diode 19 to the normally closed contact of the relay 15 and to ground. The normally closed contacts of the relay 15 are therefore configured to short-circuit the sensor group 18 via the diode 19. 20 is a sensor operation detection circuit that detects the operation of the sensor group 18, for example, a D-FF similar to D-FF8;
-FF, and the input terminal of this D-FF 20 has a control voltage (2) for memory operation.

is applied, the input terminal CP is connected to the connection point between the resistor 17 and the sensor group 18, the input terminal CL is connected to the terminal CL of the D-FF 8, and the terminal PR is connected to the ground. D-FF2
An alarm device, such as an alarm buzzer 22, is connected to the output terminal Q of 0 via a timer circuit 21.

Then, all other switches except for the separate switch 73 and the sensor group 18 are 1.
It can be stored in one case and works as a security device.

Separate switch 3 is connected to the security device body with a lead wire,
For example, it is set right next to the front door. Sensor group 1
Each sensor in 8 is composed of a switch whose contact is turned on when the window or door is idle, and whose contact is turned off when the window or door is opened.

In the above configuration, in the initial state, switches 1 and 3
is off, the CP large input OVl of D-FF8 is at the "L" level, which causes the Q output to become "L"
The level and Q output are ■. 5, that is, the level is Explosive. Q output is II L I! Because the level is
A loop of resistor 17 → diode 16 → Q@ terminal of D-FF8 → ground is formed, and the potential between resistor 17 and sensor group 18 becomes L" level. Therefore, sensor group 18 is connected to the Q output of D-FF8. It will be short-circuited.

In such a situation, when the user is at home and wants to set up the security device, turn on switch 1. Then switch 1 and resistor 4
The connection point becomes VDD potential and D to F F 8. C of
Since the P input becomes H level, the Q output becomes H level, which turns on the transistor 10 and lights up the security set lamp 11 to notify that the device has been set. - When the Q output of FF8 reaches the "11" level, the loop of resistor 17 → diode 16 → Q terminal of D-FF8 → ground is interrupted by diode 16, and instead of this, the loop of resistor 17 → diode 19 → relay 15 is Sensor group 18 in the loop of open contact → ground
The short-circuit condition is maintained. Furthermore, the timer circuit 12 is activated by the Q output of the "H" level, and after a set time, an output signal is output, turning on the transistor 14, which excites the relay 15, turning off its normally closed contact, and the sensor group 18
The short-circuit condition of is released. If there is an intruder from the outside and a window or door is opened, the sensor group 18 will be turned off and the potential between the resistor 17 and the sensor group 18 will be V.

, and the CP large input of D-FF20 it El pp
Since the output level is 2, the Q output is at the level of 2.

Then, the timer circuit 21 operates and outputs an output signal after a set time, so that the alarm buzzer 22 is energized and an alarm is issued. This allows you to know that there has been an illegal trespass.

To stop the alarm, turn on the alarm stop switch 7. As a result, the C input is given to D-FF8.20, and the D-FF8.
-FF8.20 is reset and the alarm buzzer 22 stops operating.

Furthermore, when setting up the security device when going out, in the conventional method, the user turns on the switch 1 in the same way as when he is at home, goes to the front door, puts on his shoes, opens the front door, and goes outside. However, if it takes a long time to turn on the switch 1 and go outside, there is a drawback that the set time of the timer circuit 12 is exceeded and an alarm is issued. Therefore, in this actual example,
An additional switch 3 is installed right next to the entrance door, so if you turn on the switch 3 instead of switch 1 and immediately open the door to go out, you don't have to worry about exceeding the set time of the timer circuit 12. .

Furthermore, when returning home, in the conventional method, the user would open the front door and then turn on switch 1 to disable the security device. That is, when the entrance door is opened, the sensor group 18 is turned off, and the CP of D-' F F 20 is turned off.
The input goes to the "H" level and the Q output goes to the "11" level, which causes the timer circuit 21 to start operating and energize the alarm buzzer 22 after the set time has elapsed. Switch 1 is turned on within the specified time.Then, the CP input of D-FF8 becomes high level and the Q output becomes low level.This turns off transistor 10 and turns off security set lamp 11. , resistor 17 → diode 16 → Q of D-FF8
A loop from the terminal to the ground is formed, the sensor group 18 is short-circuited, and the set state of the security device is released, so no alarm is issued. However, with the conventional method, there are cases where switch 1 is not turned on immediately after opening the front door due to the distance from the front door to the security device itself, or due to other responsibilities, resulting in an alarm being issued. was there. However, in this embodiment, as mentioned above, the separate switch 3 is installed right next to the entrance, so as soon as the entrance door is opened, the separate switch 3 can be turned on to release the set state of the security device. Therefore, there is no danger of an alarm being issued.

In the above embodiment, the D-FFs 8 and 20 are used as the memory circuit and the sensor operation detection circuit, but other circuits having the same memory function may be used. Mar
ζ, The main part of the main body of the security device can also be configured using a microcomputer.

〔Effect of the invention〕

As explained above, according to the present invention, a separate switch for setting and resetting the security state can be added, for example, right next to the front door, so by operating this separate switch, when going out or returning home, To easily and accurately eliminate the danger of a crime prevention alarm being erroneously issued.

[Brief explanation of the drawing]

The drawing is a circuit configuration diagram of a security device showing an embodiment of the present invention. 1... Switch, 2... Terminal block, 3... Separate switch, 7... Alarm stop switch, 8... Memory circuit (for example, D-FF), 11... Security set lamp, 12
゜21...Timer circuit, 15...Relay, 18...
・Sensor group, 20...Sensor operation detection circuit (for example,
D-FF), 22...Alarm buzzer.

Claims (1)

[Claims] A series-connected group of sensors attached to windows and doors to detect their opening/closing status, a switch for setting and resetting the crime prevention state, and a set signal and a set signal and the sensor group that memorize the setting and resetting operations by this switch. a memory circuit that outputs a reset signal for short-circuiting; a first timer circuit that is activated by the set signal of the memory circuit and outputs a signal for short-circuiting the sensor group after a set time; and a first timer circuit that outputs a signal for short-circuiting the sensor group. a sensor operation detection circuit that detects a short-circuit condition and the release of the short-circuit condition by opening the window or door; and a sensor operation detection circuit that operates when a short-circuit condition release detection signal is given from this sensor operation detection circuit and outputs an alarm signal after a set time. 1. A crime prevention device comprising: a second timer circuit, and a terminal for connecting another switch in parallel with the switch.