JPH05141139A - Locking device and writing device used therefor - Google Patents

Abstract

PURPOSE:To provide a locking device which can be unlocked at least out of contact so as to make it impossible substantially to reproduce a key device which is not normal. CONSTITUTION:When an operation button 21 of a key device 10 is operated, the key device 10 outputs a call code from a light emitting portion 12 thereof. On receiving the call code, a lock control device 11 outputs 99 random response codes and only one response code peculiar to a locking device of the set. The position of a specific code is determined by a random number. Accordingly, it is not easy to know which is a specific code from the outside. When a specific code is output, the key device 10 receives the code, generates a recognition code S, and outputs the same. On receiving the recognition code S, the lock control device 11 unlock a door 1 if the recognition code is a right code. If the recognition code is wrong or there is no response, the notice is given to a host computer 15.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a locking device and a response code writing device used in the locking device. More specifically, the present invention comprises a lock body for physically closing a door and a key device for unlocking the door without contact. Locking device and its related device.

[0002]

2. Description of the Related Art A conventional locking device is generally one in which a key is inserted into a key hole of a lock body and a key is physically unlocked when both are in contact with each other. There are also electronic keys that have a card-shaped key with a hole showing a code of several bits or a magnet embedded in them, but these are the positions of the opening and the magnet when the card is inserted into the corresponding key hole. The position is detected, and if it can be recognized as a regular key, the electromagnet or the motor is driven to unlock. In this case, since it is easy to copy the card, security is secured by a method of inputting a multi-digit numerical value from a panel attached with a door.

On the other hand, under the present circumstances, the locking device which can be unlocked without contact is limited in use such as being used for a door of an automobile. This is because the reliability as a locking device cannot be maintained at all and the body does not function as a locking device in the first place if the possibility of an erroneous operation due to noise is small. When enabling unlocking without contact, a predetermined code is output from the key device by radio waves or ultrasonic waves, and the receiver on the lock body side receives it, and if it is a proper code, unlocking is performed. A configuration that does

[0004]

However, in the configuration in which the unlocking code is transmitted from the key device, it is necessary to give a unique code to each key device, and such a code is usually written in the PROM or the like. Therefore, if the key device is obtained, it is easy to analyze the code, and there is a problem of lack of reliability. In addition, if the unlocking operation can be performed without contact, the code required for unlocking is transmitted from the key device to the external space, and the analysis of the unlocking code becomes easier. I will end up. For this reason, it is difficult to prevent illegal duplication of the key device (manufacturing of a so-called duplicate key) in the locking device in which the code is transmitted from the key device side to the lock body side.

Therefore, in a locking device that is handled by an unspecified number of people such as a hotel door, it is usual to replace the lock body and the key device every predetermined period in consideration of the possibility of illegal duplication of the matching key. Wasted time and equipment.

The locking device of the present invention has been made for the purpose of solving such problems and realizing a locking device which can be unlocked in a non-contact manner but in which code analysis and copying are practically impossible. The composition was adopted.

[0007]

As shown in the block diagram of FIG. 1, a locking device of the present invention comprises a lock body M1 for physically closing a door and at least an instruction means M2 for instructing an unlocking operation. A lock device having a key device M3 for unlocking the lock body M1 in a non-contact manner, the lock device being provided in the key device M3 and outputting a call code in response to an unlock instruction by an instruction means M2. A code output means M4 and a response code output means M5 for outputting a plurality of response codes including a code defined as a code unique to the key device M3 to be combined with the lock body M1 when the call code is received.
When a plurality of response codes output from the key device M3 are received and a code corresponding to the response code peculiar to the key device M3 is recognized, it is generated according to a predetermined procedure or a predetermined procedure. Recognition code output means M6 for outputting a recognition code, and unlocking means M for unlocking the lock body M1 when the recognition code is received.
The point is to have 7 and 7. Here, each code exchanged with the key device M3 can be configured to be output as an optical signal. By exchanging with an optical signal, it becomes strong against noise and directivity can be imparted, so that it is suitable as a locking device.

A response code writing device was invented as a product handling such a locking device. The response code writing device writes a response code peculiar to the pair or a code corresponding to this code to the key device M3 and the response code output means M5 which form a pair with the locking body M1. The main point is to provide.

[0009]

In the locking device of the present invention configured as described above, the unlocking of the lock body M1 is realized by mutual interaction between the key device M3 and the lock body M1 side. The exchange will be described below. When the unlocking operation is instructed by the instruction means M2 provided in the key device M3, the code output means M2 provided in the key device M3 outputs the calling code. When this call code is received, the response code output means M5 outputs a plurality of response codes including a code defined as a code unique to the key device M3 to be combined with the lock body M1 in advance.

The output plurality of response codes are received by the recognition code output means M6 provided in the key device M3. The recognition code output means M6 outputs a recognition code generated in accordance with a predetermined procedure or a predetermined procedure when the code corresponding to the response code unique to the key device M3 is recognized. This identification code is received by the unlocking means M7. When the unlocking means M7 receives the identification code, the unlocking means M7 unlocks the lock body M1 that physically closes the door.

On the other hand, in the case of the response code writing device which is an invention of a product handling this locking device, the writing means N causes the key device M3 and the response code outputting means M5 which form a pair with the locking device.
, The response code peculiar to the pair or the code corresponding to this response code is written.

[0012]

Preferred embodiments of the present invention will be described below in order to further clarify the constitution and operation of the present invention described above. FIG. 2 is a perspective view showing a configuration example of a locking device as an embodiment, and FIG. 3 is a block diagram showing a configuration of a lock body side and a key device.

In the present embodiment, the lock body is the door 1 of the hotel.
The lock control which is embedded in the lock driving mechanism 7 that inserts and removes the bar 3 into and from the recess 5 on the wall side by the small motor 2, and exchanges information with the key device 10 by optical communication and directly drives the bar driving mechanism 7. It is composed of a device 11. Two openings are provided on the surface of the door 1 where the lock control device 11 is embedded, and the lock control device 1 is provided in this opening.
The light emitting portion 12 and the light receiving portion 13 for optical communication, which are attached to the first housing, face each other. The lock control device 11 corresponds to the response code output means and the unlocking means. A driving power is supplied to the bartack driving mechanism 7 and the lock control device 11 from a power cable (not shown). The lock control devices 11 and the like are provided for each door 1 of the hotel, and all the lock control devices 11 are communicably connected to a host computer 15 via a communication cable 14.

The door 1 is also provided with a handle 17 for opening the door 1. If the handle 17 is rotated downward in a state where the barb 3 is detached from the recess 5, the latch drive mechanism 19 can be operated. As a result, the latch 20 can be pulled out from the recess on the wall side, and the door 1 can be opened.

As shown in FIG. 2, the key device 10 is a member having a square stick-shaped cross section, and is provided with an operation button 21 on one side, and the room number of the corresponding hotel is entered on the same face. ing. Although not shown in FIG. 2, a light emitting unit 23 and a light receiving unit 25 for performing optical communication are provided at the tip (see FIG. 3). Lock control device 1
The light emitting unit 12 of No. 1 and the light emitting unit 23 of the key device 10 are configured using LEDs that emit infrared light, and the light receiving units 13 and 25 thereof use photodiodes that are sensitive to infrared light. It is configured.

The internal structures of the lock control device 11 and the key device 10 will be described. As shown in FIG. 3, the lock control device 11
Is a ROM storing a control program and a working R
A one-chip microprocessor (hereinafter referred to as MPU) 31 having an AM built therein and having an input / output port, and an EEPROM 33 for storing a response code unique to this locking device are provided. On the other hand, the key device 10, like the lock control device 11,
It is composed of a U41 and an EEPROM 43. MP
The U31 and MPU41 can directly drive the light emitting unit 12 and the light emitting unit 23 through the output ports thereof, and can output a phase-modulated signal. Further, it is possible to sense the input port and read the signals output from each other.

EEPRO of the lock control device 11 and the key device 10
The same response code is simultaneously written in M33 and M43 by the host computer 15. The writing method will be described later. Further, the MPU 41 of the key device 10
Uses the operation of the operation button 21 as an interrupt signal source, and when the operation button 21 is operated, the operation button interrupt routine shown in FIG. 4 is executed. The MPU 41 reads the signal from the light receiving unit 25, controls the light emitting unit 23, and controls the lock control device 1
Realize communication with 1.

On the other hand, the MPU 31 of the lock control device 11 reads a signal from the light receiving part 13 and controls the light emitting part 12 to realize communication with the key device 10. The MPU 31 constantly executes the response code processing routine shown in FIG. M
The PU 31 can also handle the signal from the light receiving unit 13 as an interrupt signal, and if the interrupt mask is released, the PU 31 shown in FIG.
The interrupt processing routine shown in is executed. Since the processing shown in each figure is performed by referring to the codes that are exchanged with each other, the following description will be given by sequentially changing the reference drawings. However, in order to facilitate understanding, each step shown in the flowchart of FIG. It is assumed that the steps in the flowchart of FIG. 5 are indicated by the numbers in the 500s and the steps in the flowchart of FIG. 6 are indicated by the numbers in the 600s.

A person who uses the guest room of the hotel brings the key device 10 to the front of the door 1 and directs the light emitting portion 23 and the light receiving portion 25 toward the door 1 side to push the operation button 21. Operation button 21
In response to the operation of, the MPU 41 of the key device 10 starts the interrupt process shown in FIG. 4, and first performs a process of outputting the calling code C (step S400). Then, a signal is input from the light receiving unit 25 (step S410), and it is determined that the signal is not input within a predetermined time (step S42).
0), the process of inputting a signal (step S410) and the determination as to whether or not a header is detected (step S430) are repeated until the process goes to "RTN" to end the present interrupt routine.

MPU 31 of the lock control device 11 on the door 1 side
Constantly executes the response code processing routine shown in FIG. 5 and constantly monitors the input of a signal to the light receiving unit 13 (step S500). Therefore, when the calling code C is output from the key device 10, this is detected (step S50).
5) A process of generating an integer random number between 1 and 100 and assigning it to the variable X (step S51)
0). Further, the value 1 is substituted for initializing the variable n (step S515), and the process of setting the value 0 in the flag F is performed (step S520).

Then, it is judged whether or not the variable X into which the random number is substituted is equal to the value of the variable n (step S53).
0). Since the variable n is sequentially incremented from the initial value 1 as described later, it is considered that the variable n will eventually become equal to the variable X. If the values of the variables X and n are not equal, an integer random number in the range of 0 to 2 to the power of 2 is generated as dummy data, and the variable R is substituted (step S540). Since one of the integers of 2 to the 20th power is randomly selected, the value is previously stored in the EEPROM.
Although it is unlikely that the code unique to this locking device stored in 33 is the same, there is a possibility that they will match (step S545). If they do not match, the header H is set in this variable R. The response code is added to the response code, and the light emitting unit 12 is driven and output (step S).
550).

After that, the variable n is incremented by 1 (step S555), and it is judged whether or not the variable n exceeds 100 (step S560).
The processing from step S530 onward is repeated until the value exceeds.
While the dummy data R is output as the response code several times, there is always a timing when the value of the variable n gradually increases and becomes equal to the variable X. At this time, the process proceeds to step S570, and the lock control device 1 stored in advance in the EEPROM 33 of the lock control device 11 with a header is attached.
1 and the response code unique to the combination of the key device 10 (hereinafter,
This is called a unique code) D is driven to drive the light emitting unit 12 and output.

After the unique code D is output, the flag F is set to the value 1 (step S575), the variable n is incremented by the value 1 (step S555), and the above steps are performed until the variable n exceeds the value 100. The processing from S530 is repeated. Therefore, by repeating these processes, the unique code D is provided at a random position 1
00 response codes will be output. At the same time that the flag F is set to the value 1, the MPU 31
The signal input from the light receiving unit 13 can be accepted as an interrupt signal. When any signal is input from the key device 10 in this state, the signal input interrupt processing routine shown in FIG. 6 is started. This processing will be described later.

While the lock control device 11 receives the call code from the key device 10 and outputs the response code as described above, the key device 10 senses the light receiving portion 25 to read the signal. (See FIG. 4, step S41
0). When the signal is read and the header portion is detected (step S430), the process of reading the response code following the header is subsequently performed (step S440). When the response code is read, it is then determined whether or not this code matches the unique code stored in itself (step S45).
0). Whether the header is not detected (step S430),
When the read code does not match its own unique code, the process is repeated from the signal input (step S410). In addition, in step S450 of the present embodiment, it is directly determined whether or not the two match, but it may be determined whether or not the two have a predetermined correspondence relationship.

If any one of the response codes sent by the lock control device 11 100 times matches the unique code stored in the PROM 43 of the key device 10 (step S450), the key device 10 determines the next. The process of generating the recognition code S is performed (step S460). Various methods are conceivable for generating the recognition code. It may be a predetermined code or a code generated based on the response code received from the lock control device 11. As the latter method, for example, a response code received using a predefined function is converted and used as a recognition code, and the response code is used to specify the number of digits of a constant number such as π. Can be considered as a recognition code, a conversion code using a predetermined digit number of the response code as a conversion constant, and the like.

The recognition code generated in this way is used by the light emitting unit 2
3 is output to the outside (step S470). After that, the process returns to step S410 and the process from the signal input is repeated. However, if the signal from the lock control device 11 is not input for a predetermined time, then in step S420.
The result of the determination is "NO", and the process ends in "RTN" and the present routine ends.

When the identification code is output from the key device 10, since the interruption by the signal input to the light receiving unit 13 is normally permitted (FIG. 5, step S575), the signal input interruption process shown in FIG. The routine is started. When this process is activated, first, a process of inputting a series of codes is performed (step S600), and it is determined whether the input code can be correctly recognized as a code (step S61).
0). This is because there is a possibility of inputting noise or the like that does not make the body of the code. If it is not a code, the process directly exits to "RTN" and this routine is terminated.

If the input signal can be recognized as a code, then it is determined whether the flag F has a value of 1 (step S620). If the interrupt input is permitted, the normal flag F should have been set to the value 1, but the check is performed just in case. If the recognition code is accepted even though the flag F is not 1, the host computer 15 is notified via the communication cable 14 that there is a possibility that something wrong has been done. Perform processing (step S62)
5) Then, the process directly exits to "RTN" and the present routine is terminated.

On the other hand, if the flag F has a value of 1, it is judged whether or not the subsequently input code is correct as the recognition code (step S630), and if not, the host computer 15 is notified (step S625). If it is correct, the motor 2 of the bartack driving mechanism 7 is driven to unlock the door 1 (step S640). After that, the flag F is reset to the value 0 (step S650), and this routine ends. When the flag F is reset to 0, the interrupt activation request is masked and the signal input interrupt processing routine (FIG. 6) cannot be activated.

The signal input interrupt processing routine described above is the step S of the response code processing routine shown in FIG.
530 to S560 are repeatedly executed, and the key device 10
It is possible to execute immediately after setting the value 1 in the flag F by outputting the unique code determined for each locking device including the lock control device 11 and the lock control device 11. Therefore, the response code processing routine shown in FIG.
> 100), the flag F is reset to the value 0 if the correct recognition code has been output from the key device 10 by the time the process is repeated (FIG. 6, step S650). On the other hand, if some code is not output from the key device 10 within a predetermined time or an incorrect code is output, the flag F has a value of 1
It is maintained as it is. Therefore, the value of the flag F is discriminated (step S580), and if the flag F has the value 1, it is determined that some abnormality has occurred, and the host computer 15
(Step S585). If the flag F is not the value 1, the process directly ends in "END" and the process is terminated.

The key device 10 and the lock control device 11 described above
The exchange of codes with and is shown in FIG. As shown,
When the operation button 21 of the key device 10 is operated, the key device 10
The calling code is output from the light emitting unit 12 of. Upon receipt of this calling code, the lock control device 11 outputs, as a response code, 99 random codes and a unique code unique to the locking device of this set, with a header attached. The position of the unique code with respect to the random code is determined by a random number and differs with each operation of the operation button 21. Therefore, it is not easy to know which is a unique code by monitoring the code exchanged between the two parties from the outside. If the unique code itself is the same every time, it can be detected even if the position is changed. Therefore, only a plurality of digits within a predetermined range of the value of 2 to the 20th power are valid, and a value outside the range of the number of digits is used every time. It is also suitable to adopt a configuration in which is changed and output.

When the unique code is output, the key device 10
Receives this code, generates a recognition code S, and outputs this. Upon receiving this identification code S, the lock control device 11 unlocks the door 1 if the identification code is correct. If the recognition code is incorrect or there is no response, the host computer 1
5 is notified, but in the case of the door 1 of the hotel, it is illegal due to a simple error that the user accidentally tries to open a room other than the guest's own room, and illegal use due to the use of an illegally duplicated key device. There may be cases such as intrusion. Therefore, the host computer 15 issues a warning and instructs a response such as dispatch of a hotel man or a guard.

When an error code is repeatedly sent to the same door 1, an alarm output is immediately issued, for example, opening and closing of the elevator door on the floor is prohibited, and the floor is left. It is also possible to temporarily limit the time until the guard reaches the guest room. Furthermore,
If the guest room is vacant, the person who tries to enter the room by unlocking the lock is put in the guest room, and then the host computer 1
It is also possible to instruct from 5 to lock the door 1 in the opposite direction and lock in the intruder.

As described above, according to the locking device of the present embodiment, the door 1 can be unlocked without contact, which is easy for the user to handle and the key device 10 for unlocking.
The lock control device 11 exchanges codes with each other, and the lock of the door 1 is unlocked after confirming the proper combination. Therefore, the advantage of extremely high reliability can be obtained. In particular,
In the locking device of this embodiment, the code to be exchanged is 2 to 20.
Since it is defined as a power value, it is impossible to simply try and unlock all the combinations in terms of time, and since the codes are exchanged for confirmation, the key device 1
It is practically impossible to duplicate 0.

In the key device 10 and the lock control device 11 of this embodiment, the codes unique to the lock device are stored in the EEPROM 33 and the EEPROM 43. Therefore, by rewriting this code, the code required for unlocking can be easily changed. Next, the EEPROM 33 and the EEPROM
A configuration for rewriting the contents of M43 will be described. Figure 8
FIG. 3 is a block diagram schematically showing the internal configuration of the host computer 15 and showing how data is exchanged with the key device 10.

As shown, the host computer 15
Includes a known CPU 101, ROM 102, RAM 10
3, an input / output port 105 is provided, and a light receiving portion 113 and a light emitting portion 112 for optical communication are connected to the input / output port 105. The light receiving unit 113 and the light emitting unit 112 are the same as the light receiving unit 13 and the light emitting unit 12 of the lock control device 11. Therefore, as shown,
By disposing the key device 10 at the position where the light receiving unit 113 and the light emitting unit 112 face each other, optical communication can be performed between the key device 10 and the host computer 15.

Communication from the key device 10 to the host computer 15 is started, for example, when the operation button 21 is continuously pressed for a predetermined time or when the reset button 45 is operated through a pinhole as shown in FIG. Can be configured to. Here, the key device 10 is configured to start the code initialization processing routine shown in FIG. 9 when the operation button 21 is pressed for a predetermined time or longer.

When this routine is started, the key device 10
To know which key device 10 communicates with the host computer 15, so far EEPRO
A process of outputting the calling code and the recognition code stored in M43 to the host computer 15 is performed (FIG. 9, step S700). When the recognition code is generated by a predetermined algorithm, the code corresponding to the unique code may be used instead of the recognition code. Of course, only the calling code may be used.

After outputting these codes, the key device 10 next performs a process of inputting a signal from the host computer 15 (step S710). The key device 10 repeats the signal input process until the reception of a new code from the host computer 15 (step S710,
720). After that, when a new code is received from the host computer 15, a process of writing this into the EEPROM 43 as a new unique code for specifying the key device 10 is performed (step S730), and this routine is finished. If the key device 10 is configured to output a previously stored recognition code when the unique codes match, it is possible to receive not only a new unique code but also a new recognition code. ..

On the other hand, the host computer 15 reads the signal from the key device 10 and inputs the calling code and the recognition code (FIG. 10, step S750). continue,
The host computer 15 refers to the table stored in the ROM 102 and performs a process of determining new unique codes for the key device 10 and the lock control device 11 (step S76).
0). This table stores the correspondence between the guest room numbers of all guest rooms of the hotel and the unique codes of the locking devices, and the table is referenced so that the unique codes do not overlap.

The host computer 15 controls the light emitting section 112 to output the determined new unique code to the outside (step S770). At the same time, the host computer 15 sends the same code to the lock control device 11 of the door 1 via the communication cable 14 (step S78).
0). By receiving the calling code from the key device 10, the host computer 15 can identify which guest room the lock control device 11 corresponds to, so that the lock control device of the door 1 of the guest room. Sending the code to 11 is easy. The lock control device 11 writes the received code in the EEPROM 33.

As a result, by simply operating the operation button 21 of the key device 10 in front of the light receiving portion 113 and the light emitting portion 112 of the host computer 15, a new unlock code for the key device 10 and the lock control device 11 can be obtained. It can be changed to a number. Moreover, at this time, the new code is not displayed at all outside, in other words, the update is performed without being informed to the operator who performs the update operation of the code. In addition, updating the unique code is extremely easy, and no labor is required to replace the entire locking device as in the related art. As a result, the unlocking code can be changed more frequently than before, and in this respect also, the reliability can be improved.

The embodiments of the present invention have been described above.
The locking device of the present invention is not limited to these embodiments, for example, a configuration applied to a vehicle door locking device, a configuration applied to a front door of a gaming device such as a pachinko machine, a remote controller for which the user is desired to be restricted. It is equipped with a configuration applied to control equipment such as, a configuration that enables not only unlocking but also locking with a key device, and display means such as turning on the LED when the lock body side receives a regular identification code for unlocking Needless to say, the present invention can be implemented in various modes without departing from the scope of the present invention, such as the above configuration.

In this embodiment, the EEPROM is used to store the unique code and the like, and the code is rewritten without removing the PROM from the key device 10 and the lock control device 11. However, the PROM is removed and written. If so, a normal PROM, fuse ROM, or the like can be used. In this case, it is possible to take out the PROM and copy it. However, when generating the recognition code in the key device 10, if the algorithm for generating the recognition code is stored in the mask ROM in the CPU having the read prevention mechanism. Even if the PROM is illegally taken out and the unique code is copied, it cannot be unlocked. This is because the correct recognition code cannot be output unless the CPU side is duplicated.

Similarly, when determining whether or not the unique code corresponding to the key device 10 is present in the response code received from the lock control device 11, the lock control is performed not by simply comparing the two. It is assumed that the unique code sent from the device 11 is converted by a predetermined algorithm, and then the match with the unique code stored in the key device 10 is checked.
If stored in the OM, a duplicate key cannot be created unless duplication on the CPU side is possible, and sufficient reliability can be secured. In these cases, since the reliability of the entire apparatus is improved, it is possible to reduce the number of digits of the unique code to several digits.

On the other hand, the writing device of this locking device may be installed in a dealer or the like when the locking device is applied to the door of an automobile, and when it is applied to the door of a pachinko device, it may be used in a hall monitoring room or the like. It can be installed at. Further, in the present embodiment, when the locking device detects a suspicious signal input, the host computer 15 is notified, and the notification causes the surveillance camera to operate or video recording to be started. Is also possible.

[0047]

As described above, in the locking device of the present invention, at least the locking can be unlocked in a non-contact manner, and the unauthorized duplication of the key device can be substantially prevented. Play. Although the key device can be unlocked without contact, the key device cannot be duplicated by reading the code output to the outside by the key device and simply imitating the code. This is because the key device operates by exchanging codes with the lock body side. Therefore, the locking device of the present invention is highly reliable and easy to use.

Further, according to the configuration of the locking device of the present invention, the response code writing device writes the unique response code paired with the key device and the response code output means at the same time for unlocking. The code can be rewritten at any time, and it is easy to further improve the reliability of the locking device. Therefore, it is not necessary to replace the entire device with a locking device that is handled by an unspecified number of people such as hotel doors, and the time and effort for replacement are also unnecessary. Further, if applied to a door of a pachinko gaming device or the like, the code for unlocking in the pachinko hall can be changed, and the reliability becomes extremely high.

[Brief description of drawings]

FIG. 1 is a block diagram illustrating a basic configuration of the present invention.

FIG. 2 is a perspective view showing a use state of the locking device according to the embodiment of the present invention.

FIG. 3 is a block diagram showing a schematic configuration of a key device 10 and a lock control device 11 that constitute the locking device of the embodiment.

FIG. 4 is a flowchart showing an outline of an operation button interrupt routine in the key device 10.

FIG. 5 is a flowchart showing an outline of a response code processing routine in the lock control device 11.

FIG. 6 is a flowchart showing a signal input interrupt processing routine in the lock control device 11 in the same manner.

7 is a timing chart showing how code information is exchanged between the key device 10 and the lock control device 11. FIG.

FIG. 8 is a block diagram showing a main part of a host computer 15 which constitutes a response code writing device.

FIG. 9 is a flowchart of a code initialization processing routine showing a procedure on the key device 10 side for updating a response code.

FIG. 10 is a flowchart showing a host-side code initialization processing routine which similarly shows the procedure on the host computer 15 side.

[Explanation of symbols]

 1 door 2 small motor 3 bar 5 recess 7 bar driving mechanism 10 key device 11 lock control device 12 light emitting part 13 light receiving part 14 communication cable 15 host computer 17 handle 19 latch drive mechanism 20 latch 21 operation button 23 light emitting part 25 light receiving part 31 MPU 33 EEPROM 41 MPU 43 EEPROM 45 Reset button 101 CPU 102 ROM 103 RAM 105 Input / output port 112 Light emitting part 113 Light receiving part

Claims (3)

[Claims] 1. A locking device comprising: a lock main body for physically closing a door; and a key device for unlocking the lock main body in a non-contact manner, the lock device having at least an instruction means for instructing an unlocking operation. Code output means provided in the device for outputting a call code in response to an unlocking instruction by the instruction means, and a code unique to the key device to be combined with the lock body in advance when the call code is received are defined. Response code output means for outputting a plurality of response codes including a code, and when the plurality of response codes output from the key device are received and a code corresponding to the response code unique to the key device is recognized A recognition code output means for outputting a recognition code generated according to a predetermined procedure or a predetermined procedure; and when the recognition code is received, the lock body is unlocked. Locking device and a unlock means. 2. The locking device according to claim 1, wherein each code is exchanged as an optical signal. 3. A writing means for writing a response code peculiar to the pair or a code corresponding to the response code to the key device and the response code output means forming a pair of the locking device according to claim 1. A response code writing device having.