JP2591660B2 - Electronic lock - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lock control device, and more particularly to an electronic lock that can be unlocked by operating a plurality of key switches in a predetermined order.

2. Description of the Related Art In recent years, a system using a magnetic card or a punch card has been proposed for locking and unlocking a door lock control device, in addition to using a metal key. Further, a keyless entry system has been proposed in which an electronic lock is unlocked by inputting the same number as a previously registered number using a plurality of switches without using a key or card to be carried.

For example, as shown in JP-B-58-14910,
Systems for unlocking doors using cards are well known. Also, JP-A-56-105076 and JP-B-59-3263.
As shown in Japanese Patent Publication No. 2 (1993), an electronic lock that generates an unlock signal by operating a plurality of switches in a predetermined order is known.

Problems to be Solved by the Invention However, in the conventional keyless entry system, when a user is absent for a long time from a house provided with a lock control device, or when an unused object is held in an unused state or an unusable state. However, there is a danger of unlocking if another person repeatedly and incorrectly operates a plurality of key switches.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an electronic lock that becomes unresponsive when a plurality of key switches are operated by inputting a self-lock code number.

Means for Solving the Problems An electronic lock according to the present invention includes a plurality of key switches (11).
Unlock number storage means (45) for storing the unlock code number, and the unlock code number stored in the unlock number storage means (45) for the number input from the plurality of key switches (11). If the lock control device (1
7) an unlocking number comparing means (40) for generating an unlocking signal;
The invalid number storage means (51) for storing the self-lock code number, and the numbers input from the plurality of key switches (11) are compared with the self-lock code numbers stored in the invalid number storage means (51), and they match. An invalid number comparing means (50) for generating a coincidence signal upon occurrence of the signal, and a self-lock signal for invalidating an unlock signal to the lock control device (17) based on the coincidence signal of the invalid number comparing means (50). State switching means (60).

The state switching means (60) is a self-lock state holding circuit (switchable between a self-lock holding state for generating a self-lock setting signal and a self-lock releasing state for stopping generation of the self-lock setting signal by an output of the invalid number comparing means (50). 61), and is connected between the unlock number comparing means (40) and the lock control device (17), and is unlocked to the lock control device (17) by a self-lock setting signal of the self-lock state holding circuit (61). A switching element (71) for blocking a signal; and a self-locking state in which the same number as the self-locking code number stored in the invalid number storing means (51) is input from a plurality of key switches (11) in a self-locking state. When the state is released, the timer means (6) activated by the output of the self-lock state holding circuit (61)
5) and when the same number as the unlock code number stored in the unlock number storage means (45) is not input from the plurality of key switches during the time set by the timer means (65), the self-lock signal is output again. Gate circuit (66,
67, 68).

When the same number as the unlock code number stored in the unlocking number storage means (45) is input by operating the plurality of key switches (11) in a predetermined order, the unlocking number comparing means (4
5) generates an unlock signal and unlocks the lock control device (17). When the user holds the object provided with the lock control device (17) in the non-use state or the unusable state for a long time, the user operates the plurality of key switches (11) to change the self-lock code number and When the same number is input, a self-lock signal is generated from the self lock state holding circuit (61) of the state switching means (60) based on the coincidence signal of the invalid number comparing means (51), and the switching element (71) The unlock signal to the lock control device (17) is blocked by the self-lock setting signal of the lock state holding circuit (61), and the electronic lock is switched to the self-lock state. In this state, even if another person operates the plurality of key switches (11), the unlock signal to the lock control device (17) is invalidated, and the lock control device (17) does not unlock.

In the self-lock state, when the user again inputs the same number as the self-lock code number, the self-lock state holding circuit (61) of the state switching means (60) based on the coincidence signal of the invalid number comparing means (51). ) Generates a self-lock release signal, and the electronic lock is switched to the self-lock release state. In this state, during the time set by the timer means (65), the plurality of key switches (11) are operated in a predetermined order and the same as the unlock code number stored in the unlock number storage means (40). When the number is entered,
The unlocking number comparing means (45) generates an unlocking signal, unlocks the lock control device (17), and sets the gate circuit (66,
67, 68) are reset. If the same number as the unlock code number stored in the unlock number storage means (40) is not input during the time set by the timer means (65), the gate circuit (66, 67, 68) re-starts self-locking. A lock signal is generated to switch the electronic lock to the self-locking state, so that the self-locking state can be prevented from being released by mischief or unauthorized operation.

Embodiment An embodiment of the present invention will be described below with reference to FIGS.

First, as shown in FIG. 1, the door has a plurality of switches 11, on which numbers 0 to 9 are displayed, a check-in switch C, a check-out switch O, and a start switch ST.
Is attached. Keyboard 10
Are electrically connected to a control unit 12 constituted by, for example, a one-chip microcomputer, as shown in FIG.

Further, the control unit 12 has an input port to which a plurality of key switches 11 and a light state changeover switch 13 are connected. Further, the control unit 12 includes a lock control device 17 having an actuator such as a solenoid or a motor, a buzzer.
An output port 18 is connected to the base of each transistor 14, 15 and 16 having a collector connected to 18 and a display 19. Each of the emitters of the transistors 14, 15 and 16 is grounded. The buzzer 18 generates a sound for confirming the pressed state when any one of the key switches 11 is pressed. The display 19 is a light emitting diode which is activated when an unlock signal is generated.

The control unit 12 compares the number input from the plurality of key switches 11 with the unlock code number stored in the unlock number storage means. And an unlock number comparing means for generating an unlock signal in the lock control device 17 when they match. Further, the control unit 12 compares the numbers input from the plurality of key switches 11 with the self-lock code numbers stored in the invalid number storage means, An invalid number comparing means for generating a coincidence signal, and a state switching means for generating a self-lock signal for invalidating an unlock signal to the lock control device 17 based on the coincidence signal of the invalid number comparing means. The state switching means alternately switches the electronic lock between a self-locking state in which the unlocking signal to the lock control device 17 is invalidated and a release state in which the unlocking signal is not invalidated by the repeated output of the invalidation number comparing means. Further, the state switching means includes timer means. In the self-locking state, after inputting the same number as the self-lock code number with the plurality of key switches 11, during the time set by the timer means, the same as the unlock code number is obtained. The number is input by a plurality of key switches 11, and an unlock signal is output from the unlock number comparing means to the lock controller 17.

Hereinafter, the operation of the above configuration will be described with reference to the operation sequence of FIG. In step 20, it is determined whether or not a number has been input by pressing a plurality of key switches 11. If the number is not input, the process returns to the start. If the number is input, the input number is compared with the unlock code number stored in the unlock number storage means by the unlock number comparing means (step 21). If the entered number matches the unlock code number, the process proceeds to step 28. Here, it is determined whether or not the vehicle is in a self-lock state. If the vehicle is in the self-lock state, the process returns to the start. If the state is unlocked in step 28, the process proceeds to step 30 and is unlocked. If it does not match the unlock code number in step 21, the invalid number comparing means proceeds to step 22 and determines whether or not it matches the self-lock code number.

If the entered number does not match the self-lock code number, return to START.
Proceed to 23. In step 23, the state switching means determines whether the electronic lock is in a self-locked state. When the electronic lock is in the released state, the process proceeds to step 29, and the state switching means switches the electronic lock to the self-lock state. If the electronic lock is in the self-lock state in step 23, the process proceeds to step 24, where the self-lock state is released. Then step 25
The timer means determines whether or not a predetermined time has elapsed after the self-lock state is released. After a certain time,
Proceeding to step 29, the self-lock state is held again until a number is input by the plurality of key switches 11. If the fixed time has not elapsed in step 25, the step
Proceeding to 26, it is determined whether there is a switch input. If there is no switch input, the process returns to step 25. If there is a switch input, the unlock number comparing means determines in step 27 whether the input number matches the unlock code number. If the input number does not match the unlock code number,
Returning to step 25, if they match, in step 30, an unlock signal is generated from the unlock number comparing means.

Embodiments of the present invention can be modified. For example, the second
FIG. 3 and FIG. 3 show an example in which an electronic lock according to the present invention is constituted by using an IC such as a microcomputer. However, as shown in FIG. 4, an electronic lock according to the present invention is constituted also by a discrete circuit. be able to. The embodiment of FIG. 4 will be described below.

The key switches 11 are connected to an unlocked number comparator (unlocked number comparing means) 40, an invalid number comparator (invalid number comparing means) 50, and an OR gate 41 via a chattering prevention circuit 30. The output of the OR gate 41 is supplied to the buzzer 18, the retrigger one-shot multivibrator 42, and the address counter 43. The buzzer 18 is energized by the output of the OR gate 41 generated each time the key switch 11 is pressed, and generates an auditory signal. The retrigger one-shot multivibrator 42 generates an output having a pulse width of about 5 seconds when receiving a signal from the OR gate 41, and when receiving the next input within 5 seconds, counting the pulse width again from that time. To start. The one-shot multivibrator 44 generates an output at the falling edge of the pulse when the output of the one-shot multivibrator 42
A reset signal is given to the address counter 43 through 47. The address counter 43 counts the number of outputs of the OR gate 41 and generates an address signal of each digit. The address signal of the address counter 43 is applied to an unlock number storage 45 (unlock number storage means), an invalid number storage (invalid number storage means) 51, and a digit number detector 46.

The digit number detector 46 outputs an OR gate 47 when the output of the address counter 43 reaches a predetermined digit (for example, 3, 5 or 7 digits).
To the address counter 43 through the reset signal. The unlock number storage 45 receives the address signal output from the address counter 43 and outputs the stored unlock code number to the unlock number comparator 40. Similarly, the invalid number storage unit 51 receives the address signal output from the address counter 43 and outputs the stored self-lock code number to the invalid number comparator 50. The invalid number storage 51 has a W / R terminal connected to the switch 13, and when the switch 13 is in an off state and an on state, the invalid number storage 51 is in a readable read mode and a writable write mode, respectively. Is switched.

The output of the unlock number comparator 40 is sent to the counter 49.
The output of the counter 49 is sent to the lock control device 17 and the display 19. The output of the invalid number comparator 50 is sent to the counter 52. The output of the counter 52 is connected to a one-shot multi-valve generator 53. One-shot multivibrator
The output terminal 53 is connected to a state switching circuit (state switching means) 60.

The state switching circuit 60 has an R / S flip-flop 61 for switching between the self-lock state and the release state of the electronic lock. The output of the one-shot multivibrator 53 is AND gate
It is connected to the set terminal of the flip-flop 61 via 62 and the OR gate 63. The flip-flop 61 is switched between a self-lock holding state in which a self-lock setting signal is generated by the Q output terminal and a self-lock release state in which generation of the self-lock setting signal from the Q output terminal is stopped by the output of the invalid number comparator 50. . The output of the one-shot multivibrator 53 is connected to a reset terminal of the one-shot multivibrator 53 via an AND gate 64. The Q output terminal of the one-shot multivibrator 61 is connected to the bases of the transistors 71 and 72 and the inverting input terminal of the AND gate 62 for applying a self-lock signal. The collector of the transistor 71 is connected to the output terminal of the counter 49, and the emitter is grounded. Transistor 72
Is connected to the input terminal of the buzzer 18, and the emitter is grounded. The output terminal of the flip-flop 61 is connected to the inverting input terminal of the AND gate 64, the input terminal of the AND gate 66, and the timer 65. The output of the timer 65 is connected to the inverting input terminal of the AND gate 66. When the output terminal of the flip-flop 61 changes from the low voltage level to the high voltage level and generates a self-lock signal, the timer 65 generates an output having a pulse width of a certain time. An unlock signal is supplied to the input terminal of the AND gate 67 as the output of the timer 65 and the output of the counter 49, and the output of the AND gate 67 is
It is provided to the set terminal of the R / S flip-flop 68. The output terminal of the flip-flop 68 is connected to the inverting input terminal of the AND gate 66, and the output of the OR gate 47 is supplied to the reset terminal. The output terminal of the AND gate 66 is connected to the OR gate 63. The output of OR gate 47 is each counter
It is supplied to the reset terminals 49 and 52 and the flip-flop 68. AND gate 66 and 67 and flip-flop
61 and 68 constitute a gate circuit.

In the above configuration, the operator operates the plurality of key switches 11
Are operated in a predetermined order, the input number is given to the unlock number comparator 40 and the invalid number comparator 50. at the same time,
The outputs of the plurality of key switches 11 are supplied to the address counter 43 via the OR gate 41.
43 supplies the address signal to the unlock number storage 45 and the invalid number storage 51. Therefore, the unlock code number stored in the unlock number storage 45 is sent to the unlock number comparator 40. Further, the self-lock code number stored in the invalid number storage 51 is given to the invalid number comparator 50.

When each digit of the input number matches the stored unlock code number, the unlock number comparator 40 outputs an output to the counter 49 for each digit. When all digits match, the counter 49 generates an output on the lock controller 17 and the display 19. Therefore, the lock control device 17 unlocks and the unlocked state is displayed on the display 19. When each digit of the input number matches the stored self-lock code number, the invalid number comparator 50 outputs an output to the counter 52 for each digit.
If all digits match, the counter 52 generates an output. After the output of the counter 52 is shaped by the one-shot multivibrator 53, the output is sent to the state switching circuit 60.

In the normal use state, the state switching circuit 60 is shifted to the release state. In this state, the flip-flop 61
Is in a reset state. That is, the Q output terminal is at a low voltage level and the output terminal is at a high voltage level. The inverting input terminal of the AND gate 62 is provided with a low voltage level signal, and the inverting input terminal of the AND gate 64 is provided with a high voltage level signal. Therefore, when an output is generated from the one-shot multivibrator 53, the AND gate 62
, And this output is applied to the set terminal of the flip-flop 61 through the OR gate 63. Therefore, flip-flop 61 is switched to the set state, and Q
The output terminal is switched to a high voltage level and the output terminal is switched to a low voltage level. When the flip-flop 61 is in the set state, the electronic lock enters the self-lock state. Therefore, the transistors 71 and 72 are turned on, the output of the counter 49 is not provided to the lock control device 17 and the display 19, and
The output of the OR gate 41 is not provided to the buzzer 18. In the self-locking state, the buzzer
The operation sound is not generated by 18 and the lock control device 17 is not operated even if the same number as the unlock code number is input from the key switch 11.

Next, when the operator inputs the same number as the self-lock code number from the key switch 11, an output is generated from the counter 52 as described above. Accordingly, a pulse is applied from the one-shot multivibrator 53 to the AND gates 62 and 64. Therefore, an output is generated from the AND gate 64, and the flip-flop 61 is switched to the reset state. Therefore, an output is generated from the output terminal of the flip-flop 61, and an output is generated from the timer 65 for a fixed time of, for example, three minutes. The operator must input the same number as the unlock code number from the key switch 11 during this fixed time. That is, during the time that the timer 65 is generating output, the same number as the unlock code number is
Upon input by 11, the counter 49 generates an unlock signal as an output. Therefore, the AND gate 67 generates an output, the flip-flop 68 is set, and an output is generated from the Q output terminal. After a predetermined time has elapsed in this state, the timer
When the time of 65 expires, the output of timer 65 goes to a low voltage level, and AND gate 66 does not produce an output. However, if the unlock signal is not generated from the counter 49 during the time set in the timer 65, the flip-flop 68 is not set, and when the timer 65 stops outputting, the AND gate 66 generates an output. The flip-flop 61 is set through the OR gate 63 and switched to the self-lock state. As described above, the state switching circuit 60 is alternately switched between the self-locked state and the released state each time an output is generated from the counter 52.

To change the self-lock code number, press the key switch with the write state switch 13 turned on.
Numbers generated by pressing 11 in a predetermined order are stored in the respective addresses of the invalid number storage 51. Therefore, after the write state switch 13 is turned off, the invalid number storage 51
The newly stored number is compared by the invalid number comparator 50.

The above embodiment of the present invention can be variously modified. In the above embodiment, the case where the operator is away from the house for a long time has been described. However, the present invention can be applied to other cases. For example, the electronic lock of the present invention can be installed in a guest locker or rental apartment at a golf course. In this case, the administrator can switch an unused locker or condominium or a locker after a predetermined time has elapsed to the self-locking state. Further, similarly to the invalid number storage unit 51, the unlock number storage unit 45 storing the unlock code number can be configured to be switched to the write mode in which a desired number can be stored.

According to the present invention, it is possible to prevent an electronic lock of an object in an unused state or an unusable state from being switched to a self-locking state, thereby preventing unauthorized unlocking, theft and intrusion of the electronic lock. Also, if the same number as the unlock code number stored in the unlock number storage means is not input within a certain period of time after the self-lock is unlocked, the electronic lock is not unlocked and is held in the self-lock state again. Therefore, the antitheft property is improved.

[Brief description of the drawings]

FIG. 1 is a front view of an electronic lock according to the present invention, FIG. 2 is a block diagram showing an electric circuit of the electronic lock according to the present invention, FIG. 3 is a flowchart showing an operation sequence for operating the electric circuit of FIG. FIG. 4 is a circuit diagram showing an electronic circuit of the electronic lock according to the present invention. 11 key switch, 40 unlock number storage (unlock number storage means), 17 lock control device, 45 unlock number comparator (unlock number comparison means), 51 invalid number Storage unit (invalid number storage unit), 50: invalid number comparator (invalid number comparison unit), 60: state switching unit, 65: timer (timer unit)

Claims (1)

(57) [Claims] A plurality of key switches (11), an unlock number storage means (45) for storing an unlock code number, and a number input from the plurality of key switches (11) are stored in an unlock number storage means (45). An unlock number comparing means (40) for comparing the unlock code number stored in 45) with the unlock code number and generating an unlock signal in the lock control device (17) when the numbers match, and an invalid number storage for storing the self-lock code number Means (51), and a number inputted from the plurality of key switches (11) is compared with a self-lock code number stored in the invalid number storage means (51), and an invalid number which generates a coincidence signal when these coincide with each other. A comparison means (50) and a state switching means (60) for generating a self-lock signal for invalidating an unlock signal to the lock control device (17) based on the coincidence signal of the invalid number comparison means (50). For electronic locks, The switching means (60) is a self-lock state holding circuit (61) which is switched to a self-lock holding state for generating a self-lock setting signal and a self-lock releasing state for stopping generation of the self-lock setting signal by the output of the invalid number comparing means (50). ) And an unlock signal to the lock control device (17) which is connected between the unlock number comparison means (40) and the lock control device (17), and is supplied to the lock control device (17) by a self-lock setting signal of the self-lock state holding circuit (61). Switching element (7
1) and invalid number storage means (5
Activated by the output of the self-lock state holding circuit (61) when the same number as the self-lock code number stored in 1) is input from a plurality of key switches (11) and the self-lock state is released. Timer means (65)
And when the same number as the unlock code number stored in the unlock number storage means (45) is not input from a plurality of key switches during the time set by the timer means (65),
A gate circuit (66, 67,
68) An electronic lock comprising: