JPH0444064B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a room entry control system, and particularly to a room entry control system that allows an administrator of the system to prohibit entry into the room from the outside.

Conventionally, access control systems have been known in which a personal code given to each person is input into an input device near the entrance door of the room, and the door is unlocked and the person can enter the room only when certain entry conditions are met. ing.

An example of an application of such a room access control system is system management of a conference room where only people from the same workplace can enter, such as when a secret project meeting is held with specific members. In some cases, a person, etc., prohibits the use of the room at all, or allows a specific person to use the room exclusively. In this case, the system administrator may perform external operations to enter the room by entering a personal code. An entry control system that can be set so that the door will not be unlocked even if the door is turned is desired.

In order to meet such demands, the present invention aims to provide an access control system that has a simple structure and that can prohibit unlocking with only a simple external operation of inputting a specific code. purpose. According to the present invention, there is provided a code input device for inputting personal codes separately assigned to a plurality of individuals when entering a room, a storage device for storing predetermined information related to the personal codes, and the above-mentioned. A data determination circuit that compares input data from a code input device with information stored in the storage device to determine permission or disapproval of entry; and a lock control circuit that unlocks a door upon receiving a permission signal from the data determination circuit. an access control system comprising: a prohibition code memory that stores an unlock prohibition code different from the personal code; a prohibition signal storage section provided in a part of the storage device; and an input from the code input device. A comparator that compares the data with the unlock prohibition code stored in the prohibition code memory and outputs a match signal if they match; When the contents are read out and the prohibition signal storage section stores the unlocking prohibition signal, the unlocking prohibition signal is erased, and when the prohibition signal storage section does not store the unlocking prohibition signal, a control unit that writes the unlocking prohibition signal in the prohibition signal storage unit; and an input of the permission signal to the lock control circuit based on input data from the code input device is recorded in the prohibition signal storage unit. According to the present invention, there is provided an entry control system with an unlocking prohibition function, which is characterized by being equipped with a circuit that prohibits unlocking by means of an unlocking prohibition signal. As a result, a person who knows the above-mentioned unlocking prohibition code, such as an administrator, can input the unlocking prohibition code from the code input device to prohibit subsequent unlocking operations for entering the room. This is an entry control system that can be set from the outside to prohibit unlocking.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Referring to FIGS. 1 and 2, in the illustrated embodiment, each person inserts a card 1 on which a personal code is magnetically recorded into a magnetic card reader 2, which is a code input device near the door, when entering the room. This shows the case of a room entry control system in which a code is input by inserting the code into the mouth.

The information recorded on the card is a personal code assigned to the individual, and in addition to the number indicating the individual, entry conditions such as the date and time of entry and the door number for entry are recorded. In other system configurations, these entry conditions may not be recorded on the card but may be stored in the storage device 7 in the system.

According to the present invention, a small number of cards 1' having only unlocking prohibition codes (hereinafter referred to as prohibited cards) are prepared and managed by a specific person such as an administrator.

Data read from the card reader 2 is temporarily stored in a shift register 3, and inputted from there to a controller 4 and a comparator 5.

The comparator 5 compares the contents of the shift register 3 with an unlock prohibition code stored in a separately provided prohibition code memory 6, and generates a match output when the two match.

On the other hand, when an input is received from the shift register 3, the controller 4 reads out the stored contents of the storage device 7 according to the personal code, and compares the input data with the stored contents and other room entry conditions. It has a data determination circuit 8 that determines whether entry is permitted or not.

When the personal code of the card 1 is only an individual number and the contents stored in the storage device 7 are only the individual number of the registered person, the data judgment circuit 8 compares them, and when the two match, permission is given. Output a signal.

In an entry management system that judges entry conditions such as entry time and door, and in a system that records these entry conditions on the card 1, the data judgment circuit 8 further uses the door number stored in the storage device and the information in the controller 4. The time of the clock circuit 9 and the input data are compared, and when they match, a permission signal is generated. On the other hand, the entry conditions are not written on a card, but on a storage device 7.
(in this case, the storage device needs to have a large capacity), the individual number and the corresponding entry conditions are stored in the storage device 7.
At the same time, the door number assigned to the controller is also read, and based on the output of the clock circuit 9, the data determining circuit 8 determines whether entry is permitted or not.

Note that the storage device 7 not only stores the above information, but also has a prohibition signal storage section that records a signal for prohibiting unlocking according to the present invention, and when a prohibition signal is written therein, the prohibition signal is not unlocked. Generates a lock prohibition signal.

The coincidence output of comparator 5 is output from flip-flop 10.
Set this by typing . Further, the coincidence output of the comparator 5 is given to the controller 4.

The controller 4 has a control section 11 that operates upon receiving the coincidence output from the comparator 5, and this control section 11 operates as follows.
It is activated by a coincidence output, reads out the contents of the prohibition signal storage part of the storage device 7, erases it if it stores a prohibition signal, and writes the prohibition signal there if it does not.

After writing or erasing the inhibit signal, the control section 11 also provides a reset signal to the flip-flop 10 and an operation signal to the memory abnormality detector 12.

If the storage contents of the storage device 7 are damaged for some reason, accurate operation will not be possible. Outputs a signal indicating whether or not there is an abnormality. Here, in the embodiments of the present invention, a memory abnormality means that a part of the memory contents of the storage device 7 is illegally rewritten due to a malfunction caused by fluctuations in the power supply, noise, etc.
Memory abnormality detection refers to a state in which writing and erasing are not performed normally due to a defect in the IC that constitutes the memory device 7. , CRC check, etc.

The AND circuit 13 performs a logical product of the permission signal from the data judgment circuit 8, the signal obtained by inverting the set output of the flip-flop 10 by the inverter circuit 14, and the signal obtained by inverting the output of the memory abnormality detector 12 by the inverter circuit 15. In this circuit, when the flip-flop 10 is in the reset state and there is no memory abnormality, the permission signal from the data judgment circuit 8 is passed through and the unlock signal A is given. Here, in principle, the AND circuit 18 uses the permission signal from the data determination circuit 8 as the unlock signal A without providing an AND circuit.
It may be supplied to However, due to an abnormality in the storage device 7, the permission signal may be erroneously output from the data determination circuit 8. In this case, an AND circuit 13 is provided so that the unlocking signal A is not output, and the output of the memory abnormality detector 12 closes the AND circuit 13 so that the unlocking signal A is not output. Also, since the prohibited card 1' does not have data such as a personal code, when the prohibited card 1' is used, there is no permission signal from the data judgment circuit 8, but when a pseudo permission signal is present due to noise etc. In order to prevent the lock signal A from being output, the output of the flip-flop 10 is inverted by an inverter 14 and supplied to the AND circuit 13.

The AND circuit 16 is a circuit that takes the logical product of the set output of the flip-flop 10 and the output of the memory abnormality detector 12, and outputs an output signal when a memory abnormality occurs when the flip-flop 10 is set. shall be.

On the other hand, as described above, when the unlocking prohibition signal is stored in the prohibition signal storage section of the storage device 7,
An unlocking prohibition signal is output from the storage device 7, which is inverted by the inverter 17 and applied as a signal C to one input of the AND circuit 18 in FIG.

The other input of the AND circuit 18 has an unlocking signal A.
is input, and as a result, the unlocking signal A passes through the AND circuit 18 only when there is no unlocking prohibition signal from the storage device 7.

The output of the AND circuit 18 is given to the lock control circuit 20 through the OR circuit 19, and the abnormal unlocking signal B is also supplied to the lock control circuit 20 from the other input of the OR circuit 19.
0, and as a result, when either the unlock signal A or the abnormal unlock signal B is input to the lock control circuit 20, the lock device 21 will be unlocked.

The operation of this device will be explained below.

Now, as in the normal entry control system,
When a person registered in the system inserts the card 1 given to him/her into the card reader 2, the controller 4 operates and the input data is transferred to the data discrimination circuit 8.
A permission signal is generated based on the determination. On the other hand, in normal card operation, no unlocking prohibition code is input, so no matching output is output from the comparator 5, and therefore, the flip-flop 10, the control section 11, and the memory abnormality detection circuit 12 do not operate. Therefore, the permission signal from the data determination circuit 8 passes through the AND circuit 13 and provides the unlock signal A to the AND circuit 18. At this time, if there is an unlock prohibition signal from the storage device 7, the unlock signal A is blocked by the AND circuit 18, and unlocking is prohibited. On the other hand, if there is no unlocking prohibition signal, the locking device 21 can be unlocked.

When an administrator or the like wants to prohibit entry into the system or cancel the prohibition, he or she inserts the prohibition card 1' into the insertion slot of the card reader 2.
As a result, the unlocking prohibition code is input, a match signal is output from the comparator 5, and the flip-flop 1
0 is set and the control section 11 is operated.

Note that the prohibited card has no personal code and also has no corresponding stored content in the storage device 7, so no permission signal is output from the data determination circuit 8.

After starting, the control section 11 rewrites the contents of the prohibition signal storage section of the storage device 7, as described above. That is, when a prohibition signal is not written, a prohibition signal is written, thereby generating an unlock prohibition signal, and the AND circuit 18 prohibits input of the unlock signal to the lock control circuit 20. Therefore, from then on,
Unless the prohibited card is operated again, the lock cannot be unlocked except for abnormal unlocking. Note that when a memory abnormality occurs, normal operation of the system can no longer be expected, and prompt repair is required. In the embodiment of the present invention, in order to avoid a situation where the door cannot be unlocked for maintenance, if an abnormality is found in the prohibition code 1', the door can be unlocked and repaired.

On the other hand, when the prohibition signal is written, the control unit 11 erases the memory of this prohibition signal, and therefore the unlocking prohibition signal disappears.After that, when the unlocking signal A is present, the control unit 11 erases the memory of this prohibition signal. Therefore, it can be unlocked at any time. In addition, when the administrator enters the room, the administrator himself can enter the room by using the card 1 having the personal code assigned to him.

Although the present invention has been described above with respect to specific embodiments,
The present invention is not limited to this embodiment, and various modifications can be made within the scope of the present invention.
As explained above, according to the present invention, an administrator or the like inputs a card having an unlocking prohibition code from the outside through a simple operation, and until the next time a similar unlocking prohibition code is input, The system can be set to an unlocking state so that it cannot be unlocked by entering any personal code, so you can restrict entry to rooms with limited capacity such as movie theaters, theaters, conference rooms, etc. , the room can be set to be unusable.

[Brief explanation of drawings]

1 and 2 show block diagrams of one embodiment of the present invention, with FIG. 1 showing the major part thereof and FIG. 2 showing the remaining parts connected thereto. 1... Card, 1'... Prohibited card, 2... Card reader, 3... Shift register, 4... Controller, 5... Comparator, 6... Prohibition code memory, 7... Storage device, 8...Data judgment circuit, 9
...Clock circuit, 10...Flip-flop, 11
...Control unit, 12...Memory abnormality detection circuit, 1
3, 16, 18...AND circuit, 14, 15, 1
7... Inverter circuit, 19... OR circuit, 20
...Lock control circuit, 21...Lock device.

Claims (1)

[Claims] 1. A code input device for inputting personal codes assigned separately to multiple individuals at the time of entering the room, a storage device for storing predetermined information related to the personal codes, and a Room entry management comprising a data judgment circuit that compares input data with information stored in the storage device to determine permission or disapproval of entry, and a lock control circuit that unlocks a door upon receiving a permission signal from the data judgment circuit. The system includes a prohibition code memory that stores an unlock prohibition code different from the personal code, a prohibition signal storage section provided in a part of the storage device, input data from the code input device and the prohibition code. a comparator that compares an unlocking prohibition code stored in a memory and outputs a match signal if they match; and a comparator that is activated by the match output from the comparator to read the contents of the prohibition signal storage section; When the prohibition signal storage section stores the unlocking prohibition signal, the unlocking prohibition signal is erased, and when the prohibition signal storage section does not store the unlocking prohibition signal, the prohibition signal storage section erases the unlocking prohibition signal. a control unit that writes the unlock prohibition signal into the lock control circuit, and inputs the permission signal to the lock control circuit based on the input data from the code input device to the unlock prohibition signal recorded in the prohibition signal storage unit. An entry control system equipped with an unlocking prohibition function, characterized in that it is equipped with a circuit that prohibits unlocking.