JPS5932631B2 - Electronic lock acoustic display device - Google Patents

Description

[Detailed Description of the Invention] Conventional push-button electronic locks have the disadvantage that when the push-button switch is pressed to give an input signal, there is no indication that the input signal has been generated, so the operator cannot confirm the occurrence of the input signal. , pushbutton switches with the same number could be pressed twice, resulting in malfunctions.

In recent electronic locks, lighting display devices have been developed that generate light when an input signal is applied, but such light display systems require visual inspection of the lighting display each time a push button switch is pressed. It was very inconvenient.

Therefore, in the present invention, the above-mentioned drawbacks are solved by providing the electronic lock with an acoustic display device.

To explain the drawings, the electronic lock used in the present invention is
Input device A having a plurality of pushbutton switches 10a to 10e
and an arbitrary number storage device B that stores the signal of the input device A when receiving a write signal, and a first comparison device that compares the outputs of the input device A and the arbitrary number storage device B and generates an unlock signal when they match. C, the lock that is unlocked by the unlock signal from the first comparator C, the fixed number storage device E, and when the outputs of the input device A and the fixed number storage device E are compared, and when they match, the arbitrary number storage device B and a second comparator F that provides a write signal to the second comparator F.

The input device A includes a chattering prevention circuit 11 that receives signals from the pushbutton switches 10a to 10e, an OR gate 12 that receives the output of the chattering prevention circuit 11, and an address counter 13 that counts the output of the OR gate 12.

The arbitrary number storage device B has a gate 14 that receives a signal from the chattering prevention circuit 11, and a RAMI 5 that stores the signal that passes through this gate 14.

The address counter 13 provides an address signal to the RAM 15 and also provides an address signal to a fixed number storage device E constituted by a P-ROM 30 or a known circuit such as a diode matrix.

The first comparator C includes a chattering prevention circuit 11 and a RAM.
a comparator 16 that compares the outputs of the quinary 15 and generates a match signal when they match; a quinary counter 17 that counts the number of outputs from the comparator 16;
8 flip-flop 18 and a timer 19 operated by the output of this RS flip-flop 18.

The second comparator F includes the chattering prevention circuit 11 and the P-R
A comparator 20 that compares the outputs of the OM30 and generates a match signal when they match, a heptad counter 21 that counts the number of outputs from the comparator 20, and an R-8 flip-flop 22 that is set by the output of the heptad counter 21. A timer 23 is operated by the output of the R-8 flip-flop 22.

In an embodiment of the invention, the fixed number is stored as a 7-digit number and the arbitrary number is stored as a 5-digit number.

The operation to unlock the lock will be explained.

When the numbered pushbutton switches 10a to 10e are pressed in a predetermined order, this signal is sent to the chattering prevention circuit 11.
The signal is applied to the comparator 16 through the OR gate 12 and sent to the address counter 13.

Since the address counter 13 provides an address signal to the RAM 15, the RAM 15 sends the stored numbers from the first to fifth digits to the comparator 16.

The comparator 16 compares the push button switch and the numerical signal in the RAM 15 digit by digit and generates an output each time they match, and this output is counted by a quinary counter 1T.

When the quinary counter 17 counts the fifth matching signal,
generates an output, sets R-8 flip-flop 18 and operates timer 19.

When timer 19 generates an H level signal, inverter 2
4 becomes the L level, and therefore the lock is energized and unlocked.

After a predetermined time has elapsed, the timer 19 goes to L level, and at the fall of this signal, the one-shot multivibrator 25 generates an output and resets the quinary counter 1T and the R-8 flip-flop 1B.

Next, the case of changing an arbitrary number will be explained.

Press the pushbutton switches 10a to 10e to convert the 7-digit number to the comparator 20.
The comparator 20 receives the 7-digit number stored in the P-ROM 30 by the OR gate and the address counter 13.
give to

The comparator 20 compares the numeric signals of each digit and generates an output when they match.The output generated when the hexadecimal counter 21 counts 7 matching signals is used to generate an output from the R-8 flip-flop 22.
is set.

The Q output of the RS flip-flop 22 causes the timer 23 to go to H level and generate a write signal.

This write signal opens the gate 14 and puts the RAM 15 into a write state, and the address counter 13 is reset by a signal passing through the OR gate 31 and the one-shot multi-by-break 32.

One-shot multi-by-break 32 is OR gate 3
A rising signal of 1 produces an output.

Under this state, when the pushbutton switches 10a to 10e are pressed to give a five-digit numerical input signal, the RAM 15 stores the numerical input signal passed through the gate 14 while receiving the address signal from the address counter 13.

When the address counter 13 counts the input of the fifth digit, an output is generated in the OR gate 34 as a value detector, and the AND gate 33 receiving this output and the previously generated write signal opens the gate. , a reset signal is given to the address counter 13 through the OR gate 31 and the one-shot multivibrator 32.

Therefore, if the arbitrary number newly stored in the RAM 15 matches the input of the pushbutton switches 10a to 10e, the lock is released.

In the present invention, a control circuit G and a sounding device H operated by a drive signal from the control circuit G are provided in order to notify the generation of an input signal to a push button switch.

As the sounding device H, a known electronic buzzer such as a piezoelectric buzzer is used.

The control circuit G includes two AND gates 40 and 41 and an OR gate.
The AND gate 40 is provided with a write signal from the second comparator via an inverter 43 and is also provided with the output of the OR gate 12 .

The write signal of the second comparator F and the output of the OR gate 12 are directly applied to the AND gate 41 .

The OR gate 42 connects the write signal of the second comparator F and the A
It receives the input from the output of the ND gate 40, and its output is
The signal is applied to the sound generating device H via an inverter 44 and also to the collector of a transistor 45.

The base of this transistor 45 is connected to the output terminal of the AND gate 41, and the emitter is grounded.

To explain the operation of the control circuit G, when the write signal is not output from the second comparator F, the AND gate 40 receives an H level signal at one input terminal by the inverter 43.

When any of the pushbutton switches 10a to 10e is pressed in this state, the chattering prevention circuit 11 and the OR gate 1 are activated.
With an input signal passing through 2, AND gate 40 produces an output, which is passed through OR gate 42 to inverter 44.
Since the output of the inverter becomes L level, the sound generating device H is energized and notifies the generation of the input signal.

Therefore, in this state, the sound generating device H is activated every time the push button switch is pressed.

When the 7-digit fixed numbers input from the pushbutton switches 10a to 10e match, the comparator 20 generates 7 matching signals, and this signal causes the 7-ary counter 21 to generate an output and trigger the RS flip-flop 22. Once set, the timer 23 generates a write signal for a certain period of time.

This write signal is applied to the inverter 44 through the OR gate 42, so while the write signal is being generated, the sound generating device H is operating, so the arbitrary number to be stored in the RAM 15 is While the sound is being generated, up to five digits can be input using the pushbutton switches 10a to 10e.

Since the timer 23 starts operating and stops outputting, ie, generating the write signal, after a predetermined period of time has elapsed from the start of operation, the sound from the sound generating device H disappears and it is no longer possible to memorize an arbitrary number.

As mentioned above, while the write signal is being generated, the sound generating device H is operated through the OR gate 42 and the inverter 44. At this time, an arbitrary 5-digit number is pressed on the button switch 10.
When input from a to 10e, the AND gate 41 receives both forces and generates an output, making the transistor 45 conductive.

Therefore, since the output of the OR gate 42 is not applied to the inverter 44, the sound generating device H stops generating sound every time the arbitrary number input signal is given, so the operator must confirm the generation of the arbitrary number input signal. Can be done.

Input device A includes a retrigger type mono multivibrator 5.
0 is set.

This mono-multivibrator generates a signal and resets the address counter 13 through the OR gate 31 when the next push button is not pressed within a certain period of time (for example, 5 seconds) after pressing one push button.

[Brief explanation of drawings]

The attached drawings show a circuit diagram of a sound generating device according to the invention. In the figure, symbols A...input device, B...arbitrary number storage device, C...first comparison device, D...
... Lock, E ... Fixed number storage device, F ...
...Second comparison device.

Claims (1)

[Scope of Claims] 1. An input device A having a plurality of pushbutton switches, an arbitrary number storage device B that stores the signal of the input device A only when a write signal is received, and an input device A and an arbitrary number storage device a first comparison device C that generates an unlock signal when the outputs of the devices are compared and match; a lock that is unlocked by the unlock signal of the first comparison device; a fixed number storage device E; a second comparator F that compares the outputs of the input device A and the fixed number storage device E and when they match, provides a write signal to the arbitrary number storage device B; and a second comparison device F that is driven by the signal of the input device A when there is no write signal. Control circuit G that generates a signal
and a sounding device H operated by the drive signal, and when an input from the push button switch is given to the input device, the output of the device is compared with the output of the arbitrary number storage device B, and when they match. At the same time, the lock is unlocked via the first comparison device C, and the output of the input device A is applied to the control circuit G to generate a drive signal to activate the sound generation device H every time the push button switch is pressed. Acoustic display device for electronic locks. 2. Comparing an input device A having a plurality of push button switches, an arbitrary number storage device B that stores the signal of the input device A only when a write signal is received, and the outputs of the input device A and the arbitrary number storage device. a first comparison device C that generates an unlock signal when the first comparison device matches the lock; a lock that is unlocked by the unlock signal of the first comparison device; a fixed number storage device E; and a fixed number storage device E; a second comparator F that compares the outputs of the storage device E and applies a write signal to the arbitrary number storage device B when they match; and a control circuit that generates a drive signal using the signal of the input device A when there is no write signal. G
and a sounding device H operated by the drive signal, and when an input is given to the input device by the push button switch, the output of the device is compared with the output of the fixed number storage device E to find that they match. Sometimes, a write signal is generated for a predetermined time determined by the second comparator F, which generates a drive signal in the control circuit G to activate the sound generating device H for the predetermined time, and also writes any information to be stored during this time. An acoustic display device for an electronic lock that stops the output drive signal of the control circuit each time a number is input, and also mutes the sound generating device.