JPS5833349B2 - electronic lock - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electronic lock in which an unlock code is set in advance and the lock is electrically unlocked when the code input using a decimal keyboard matches the unlock code. One is to set an alarm buzzer to sound when someone other than the administrator of the electronic lock, such as an unauthorized intruder, tries to enter and the unlock code and the code from the keyboard do not match the number of consecutive times set by the administrator. , tolerating the administrator's own mistakes, and
To provide an electronic lock with an alarm device that prevents unauthorized intruders.

Another object of the present invention is to use an intermittent power supply system to save power by applying the minimum amount of electricity necessary.

FIG. 1 shows a control circuit of an electronic lock according to an embodiment of the present invention, and its operation will be explained.

The administrator arbitrarily determines an unlock code for unlocking in advance using a switch group 2 that functions as an unlock code setting device of a control unit located in the room.

The switch group 2 consists of digital switches, for example,
A plurality of switches are provided to select one of the freely changeable decimal numbers from O to 9.

When you want to unlock the door, use the clear key nC of the code pushbutton, which consists of a keyboard, for example, in the encoder unit 1, which is an input device for inputting the code set outdoors.
Press to turn on the power, then select a number from C'"1" to "'9" to select n numbers (for example, if the unlock code is 1,
2, 3, 4.5 (5 times)) to obtain n codes, which are set by the code from this code push button and the code setting switch group 2 in the control unit installed in the room. A detection device compares the input code from the push button with the set code and determines whether they match or not.

C''' is a button for clearing. When the C9+ button is pressed, the memory circuits 10, 12, 14, and 16 are reset.

When the first selected code pushbutton of the encoder unit is pressed, the encoder output X1 becomes terminal C3W1 if it matches the first code of code setting switch group 2.
An output signal appears on (if n 1 n is pressed on the code pushbutton as the first digit).

If they do not match, no output signal will appear at terminal C3WI.

On the other hand, the encoder output
The rising edge of H is differentiated to obtain a T signal, and the T signal is divided into an antagonist 17, an n-ary counter/divider 6, and a delay circuit 7.
is input.

The n-ary counter/divider 6 is set by the T signal to obtain a Q1 output.

Further, the P signal is obtained from the falling differentiation circuit 8 after a certain time delay by the delay circuit 7 from the T signal.

When the respective codes match, the output from the terminal C3W1 enters the AND gate 9 as the P signal and the Q1 output, and the output of the AND gate 9 is stored by setting the storage flip-flop 10.

Next, when the second digit is input from the encoder unit 1 using the code push button, the encoder output , if there is no match, it will not be output.

The encoder output x2 counts the n-ary counter/divider 6 to obtain the Q2 output.

When there is a match, the AND gate 11 obtains an output based on the Q2 output, the signal of the terminal C3W2, the output of the flip-flop 10, and the P signal, and the storage flip-flop 12 is set and stored.

Similarly, the code pushbutton output Xn of the n-th digit (fifth digit in this example) of the encoder unit 1 obtains the Qn output of the n-ary counter/distributor 6.

If the encoder output matches the code of the code setting switch group 2 for all up to the n-1 digit, the n-1 storage flip-flop is set.

As described above, in the detection device that detects whether the input code is correct or not, the flip-flop is not set unless there is a match among the (n-1) digits.

The last coincidence output is the output of the terminal C3Wn, the Qn output, the output of the flip-flop 16, and the T signal, and the AND gate 1
7 and is obtained as the output of the AND gate 17. Since the final match output does not need to be stored, no flip-flop is provided.

The output of the AND gate 17 passes through the OR gate 18 and triggers the monostable multi 19 to obtain the unlocking output signal a.

Signal a operates the drive circuit 20 to attract the solenoid of the lock mechanism unit 21.

Note that since the solenoid is sucked only for the time set by the monostable multi 19, the door must be opened within this time.

Next, to explain the alarm device, if the final matching output is not obtained, the output signal a of the monostable multi 19 will not be triggered, and the output Qn of the n-ary counter/divider 6 at n digits will be triggered.
and the P signal are input to the inhibit gate 22 to obtain an error output.

The error output sets an n-ary counter/distributor 23 as a counter that counts the number of times an incorrect code is input. For example, in the case of the first error, the n-ary counter/distributor 2
An output S1 with a sequence number of 3 is obtained.

At the same time, the error output also triggers the monostable multi 24,
Get a signal.

When n incorrect code numbers are entered consecutively, an output is obtained from the AND gate 25 as a circuit for detecting the coincidence between the number of errors and the allowed number of times using the output of the sequence number Sn and the signal S, and the drive circuit 26 causes a buzzer 27 as an alarm device to sound and issue an alarm.

The number of errors to be tolerated depends on the selection of the sequence output of the n-ary counter/divider 23. A sequence number setting switch SEQ is provided as a switch for presetting an error tolerance circuit, and the number of tolerable errors is set by the setting switch SEQ. The buzzer operation time can be determined arbitrarily, and the buzzer operation time depends on the setting of the return time of the monostable multi-function device 24, so a buzzer operation time setting switch TIME is provided for this purpose.

Furthermore, the output signal a1 of the monostable multi 19
Next to the OR gate 3, a prohibition gate 4 for the signal a and the signal A is provided so that the output of the encoder unit 1 becomes invalid when the output signal of the encoder unit 4 is operating. This is to prevent an error signal from being input by pressing the code pushbutton even though the electronic lock solenoid is attracted when a matching output is obtained, and to prevent the pushbutton from being pressed even though the buzzer is sounding due to an error output. This is provided to prevent the lock from being unlocked due to continuous pressing.

The double hit prevention mechanism 39 provided in the encoder unit 1 is controlled so that the encoder output of the code pushbutton is obtained at the terminals CSW, . . . C3Wn, and two or more This is to prevent the code pushbutton from being locked and obtaining encoder output when it is pressed, and also to ensure operation by preventing the same code signal from being input continuously depending on how it is pressed. .

An intermittent power supply system, which is another object of the present invention, will be explained.

Other OR gates, prohibition gates, AND gates, n-ary counters/distributors, etc., other than the OR gate 28, which is supplied with power even during non-unlocking operation, need only be energized and work when unlocking is desired. The power is turned on when the above-mentioned clear button "ca+" is pressed, or when the '0PEN' button is pressed to unlock the door from the indoor side, the power is turned on and the solenoid for unlocking is suctioned. That's fine.

Now, when the clear button "C" is pressed, the OR gate 28 and the drive circuit 29 are activated, and the latching solenoid 30 acts as a power supply control means to supply power to the entire electronic lock device.
When the set coil is energized and the contact 31 is closed accordingly, the stabilizing circuit 32 outputs the power supply voltage +■oo.

The power supply voltage +■oo applies to other OR gates other than the OR gate 28, prohibition gates, AND gates, and n-ary counters/
It is the power source for electronic circuits such as distributors, and unlocking operations are performed by pressing the code button that applies power to each circuit.

The monostable multi 34 is set through the OR gate 28 by the clear button ゛°C'' and remains set for a time (return time) sufficient to press the code push button a predetermined number of times, and the code is input from the code push button before the return time. If this is not completed, the monostable multi-by-break 34 is reset to stop energizing the entire electronic lock device other than the gate means, and a signal is sent to the reset coil of the latching solenoid 30 through the OR gate 35, the falling differential circuit 36, and the drive circuit 37. Turn on the power, open the contact 31, and set the power supply voltage to +voo
supply will be terminated.

In addition, even if the final match output is obtained before the recovery time, it is possible to prevent the power supply voltage +■oo from being cut off before the door is opened, and to prevent the error output from being output when an error code is input and to prevent the signal from being sent to the monostable multi 24. When the alarm buzzer does not sound, input the signal a of the monostable multi 19 and the signal of the monostable multi 24 to the OR gate 40 so that you can try to unlock by pressing the code push button again. The monostable multi 34 can be reset by the output to continue supplying the power supply voltage +■oo.

To perform the unlocking operation, a memory flip-flop 10°12.
14, 16 and the n-ary counter/distributor 6 must be reset by the signals from the clear button ``C'' and the oven button ``0PEN''. The output signal C of the OR gate 28 is input to the OR gate 3.
8 and storage flip-flops 10, 12 14,
Reset 16.

Further, the signal C or the output of the OR gate 40 is input to the OR gate 42, and the n-ary counter/divider 6 is reset by the output of the OR gate 42.

As mentioned above, the present invention is a simple, reliable, and highly secure device realized by combining a switch and an electronic circuit into a so-called electronic lock that can be unlocked using a decimal keyboard. Even if there is an error, the bell will not ring immediately, and you can enter the code from the keyboard only a set number of times.

Further, when the lock is not unlocked, power is supplied only to the OR gate 28 and no power is supplied to others, so that it has extremely large effects such as low power consumption.

[Brief explanation of drawings]

FIG. 1 is a circuit diagram showing an embodiment according to the present invention. 1... Encoder unit (input device),
2... Switch group, 4, 22... Inhibition gate, 6... N-ary counter/distributor, 10,
12, 14, 16...Flip-flop, 19
,24,34... Monostable multi, 20,26,
29, 37... Drive circuit, 21... Lock mechanism unit, 23... N-ary counter/
Distributor (counter), 25...AND circuit (circuit for detecting coincidence), 27...Buzzer (alarm device), 28...OR gate (gate means) 30
...Latching solenoid (power supply means). SEQ...Sequence number setting switch (error tolerance number setting switch).

Claims (1)

[Claims] 1. An input device for inputting a code by an operator, a setting device for setting an unlock code, a detection device for detecting whether the input code is correct, and a detection device for detecting whether an incorrect code is input by the operator. A counter that counts the number of times,
A switch that presets the allowable number of errors, a circuit that detects a match between the number of errors and the allowable number of errors, an alarm device that operates based on the matching detection power of the circuit, and is supplied with power even when the lock is not unlocked. a gate means, a power supply control means for driving the gate means and supplying power to the entire electronic lock device by input from the key operated when desired to unlock; and a power supply control means for supplying power to the entire electronic lock device; The invention is characterized in that it is provided with a monostable multi-by-break that is set by a signal and that, when a predetermined time has elapsed, the power supply control means stops energizing the entire electronic lock device other than the gate means. Electronic lock.