JP3286995B2 - Locking device and writing device used therefor - Google Patents

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 for the locking device, and more particularly to a lock body for physically closing a door and a key device for unlocking the door in a non-contact manner. And related devices.

[0002]

2. Description of the Related Art In general, a conventional locking device inserts a key into a keyhole of a lock body and physically unlocks the key in a state where both are in contact with each other. There are also electronic keys in which a hole indicating a code of several bits is drilled or a magnet is embedded in a card-like key.However, by inserting a card or the like into the corresponding keyhole, the position of the opening and the magnet Is detected, and if it can be recognized as a legitimate key, an electromagnet or a motor is driven to unlock the key. In this case, since it is easy to duplicate a card, security is ensured by, for example, inputting a multi-digit number from a panel to which a door is attached.

On the other hand, at present, lockers that can be unlocked in a non-contact manner have limited applications, such as being used for doors of automobiles. This is because if there is only a small possibility of an erroneous operation due to noise, the reliability of the locking device cannot be maintained at all, and the locking device does not function in the first place. When unlocking operation is possible without contact, a predetermined code is output from the key device by radio waves or ultrasonic waves, and the receiver on the lock body receives this. There is a possible configuration.

[0004]

However, in a configuration in which an unlocking code is transmitted from a key device, it is necessary to assign a unique code to each key device, and such a code is usually written in a PROM or the like. Therefore, if the key device is obtained, it is easy to analyze the code, and there is a problem that the reliability is lacking. In addition, if the unlocking operation can be performed in a non-contact manner, the code required for unlocking is transmitted from the key device to an external space, and the analysis of the unlocking code becomes easier. I will. For this reason, it is difficult to prevent an illegal duplication of the key device (a so-called duplicate key production) with a locking device that transmits a code from the key device side to the lock body side.

Therefore, in a locking device which 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 a duplicate key. Time and equipment wasted.

The locking device of the present invention has been made to solve the above-described problems, and has an object to realize a locking device that can be unlocked in a non-contact manner, but in which code analysis and duplication are virtually impossible. The configuration was adopted.

[0007]

As shown in the block diagram of FIG. 1, the lock 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. And a key device M3 for unlocking the lock body M1 in a non-contact manner. The key device M3 is provided in the key device M3, and outputs a call code in response to an unlock instruction by an instruction means M2. A code output means M4 and a signal which, when receiving the call code, include a code previously defined as a code unique to the key device M3 combined with the lock body M1 in a random position with respect to a plurality of response codes. a response code output unit M5 for sequentially outputting the provided key device M3, straight which receives a plurality of response codes the output recognize code corresponding to a unique response code to the key device M3 To a recognition code output means M6 for outputting a recognition code that is generated according to a predetermined or predefined procedure, when the identification code, received after the output of the intrinsic response co <br/> over de, the The gist comprises an unlocking means M7 for unlocking the lock body M1.
Here, each code exchanged with the key device M3 can be configured to be output as an optical signal. By exchanging with optical signals, it becomes strong against noise and can give directivity,
It is suitable as a locking device.

[0008] A response code writing device has been invented as a device that handles such a locking device. The response code writing device writes the response code unique to the key device M3 and the code corresponding to the code to the key device M3 and the response code output device M5, which are paired with the lock body M1, respectively. The gist 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 exchange between the key device M3 and the lock body M1. The exchange will be described below. When an unlocking operation is instructed by the instructing means M2 provided in the key device M3, the code output means M2 provided in the key device M3 outputs a call code. When receiving this call code, the response code output means M5 includes a code previously defined as a code unique to the key device M3 combined with the lock body M1 at a random position with respect to the plurality of response codes. Outputs signals sequentially .

The output plurality of response codes are received by the recognition code output means M6 provided in the key device M3. Immediately after recognizing the code corresponding to the response code unique to the key device M3,
A recognition code generated according to a predetermined or predetermined procedure is output. This recognition code is used for unlocking means M7.
Received by The unlocking means M7 outputs the recognition code,
When the lock is received after the output of the unique response code, the lock body M1 with the door physically closed is brought into the unlocked state.

On the other hand, in the case of the response code writing device which is an invention of the product handling the locking device, the writing device N allows the key device M3 paired with the locking device and the response code output device M5.
, A response code unique to the pair or a code corresponding to the response code is written.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS In order to further clarify the structure and operation of the present invention described above, preferred embodiments of the present invention will be described below. 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 and a key device.

In this embodiment, the lock body is a door 1 of a hotel.
A bar drive mechanism 7 for inserting and removing the bar 3 into and from the recess 5 on the wall side by a small motor 2, a lock control for exchanging information by optical communication with the key device 10 and directly driving the bar drive 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.
The light emitting unit 12 and the light receiving unit 13 for optical communication attached to the housing 1 face. The lock control device 11 corresponds to a response code output unit and an unlocking unit. The bar drive mechanism 7 and the lock control device 11 are supplied with drive power from a power cable (not shown). These 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. When the handle 17 is rotated downward while the bar 3 is released from the recess 5, the latch drive mechanism 19 is opened. Thereby, the latch 20 comes out of the recess on the wall side, and the door 1 can be opened.

As shown in FIG. 2, the key device 10 is a stick-shaped member having a square cross section. An operation button 21 is provided on one side, and the room number of the corresponding hotel is written on the same surface. 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 the key device 10 and the light emitting unit 23 of the key device 10 are configured using an LED that emits infrared light. The light receiving unit 13 and the light receiving unit 25 use a photodiode that senses infrared light. It is configured.

The internal configuration 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
The locking device includes a one-chip microprocessor (hereinafter, referred to as an MPU) 31 having an input / output port and a built-in AM, and an EEPROM 33 for storing a response code unique to the locking device. On the other hand, like the lock control device 11, the key device 10
It comprises 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 their output ports, and can output a signal with phase modulation. Further, by sensing the input port, signals output from each other can be read.

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

On the other hand, the MPU 31 of the lock control device 11 reads a signal from the light receiving unit 13 and controls the light emitting unit 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 when the interrupt mask is released, the PU 31
The interrupt processing routine shown in FIG. The processing shown in each figure is performed with reference to codes exchanged with each other, so that the following description will be given by sequentially changing the drawing to be referenced. However, in order to facilitate understanding, each step shown in the flowchart of FIG. Each step shown in the flowchart of FIG. 5 is represented by a numeral in the 500s, and each step shown in the flowchart of FIG. 6 is represented by a numeral in the 600s.

A person using the guest room of the hotel reaches the door 1 with the key device 10 and pushes the operation button 21 with the light emitting unit 23 and the light receiving unit 25 facing the door 1. Operation button 21
In response to this operation, the MPU 41 of the key device 10 starts the interrupt process shown in FIG. 4, and first performs a process of outputting the call code C (step S400). Subsequently, a signal is input from the light receiving unit 25 (step S410), and it is determined that no signal is input within a predetermined time period (step S42).
0), the process of inputting a signal (step S410) and the determination of whether or not a header is detected (step S430) are repeated until the process exits to "RTN" and ends the interrupt routine.

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

Subsequently, it is determined whether or not the variable X to 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, a process of generating an integer random number in the range from the value 0 to 2 to the 20th power as dummy data and substituting this for the variable R is performed (step S540). Since one of 2 to the 20th power integer is randomly selected, its value is previously stored in the EEPROM.
Although the probability of being equal to the unique code of the locking device stored in 33 is low, there is also a possibility that they match, so this is checked (step S545), and if they do not match, the header H is added to this variable R. Then, a process of driving the light emitting unit 12 to output the response code is performed (step S
550).

Thereafter, the variable n is incremented by 1 (step S555), and it is determined whether the variable n has exceeded the value 100 (step S560).
Is repeated until step S530 is exceeded.
While the dummy data R is output as a response code several times, there is always a timing at which the value of the variable n gradually increases and becomes equal to the variable X. At this time, the process proceeds to step S570, in which a header is added, and the lock control device 1 stored in the EEPROM 33 of the lock control device 11 in advance is used.
1 and a response code unique to the combination of the key device 10 (hereinafter referred to as
A process of driving the light emitting unit 12 to output D is output.

After outputting the unique code D, the value 1 is set to the flag F (step S575), the variable n is incremented by 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 provided at random positions
00 response codes will be output. At the same time as setting the value 1 to the flag F, the MPU 31
A 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, a signal input interrupt processing routine shown in FIG. 6 is started, and this processing will be described later.

As described above, while the lock control device 11 performs a process of receiving a call code from the key device 10 and outputting a response code, the key device 10 senses the light receiving unit 25 and reads a signal. (See FIG. 4, step S41
0). When the signal is read and the header portion is detected (step S430), processing for reading the response code following the header is performed (step S440). When the response code is read, it is next determined whether or not this code matches the unique code stored therein (step S45).
0). If no header is detected (step S430),
If the read code does not match its own unique code, the processing is repeated from the input of the signal (step S410). In step S450 of this 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.

If any one of the response codes sent out 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 Then, a process of generating a recognition code S is performed (step S460). Various methods can be considered for generating the recognition code. The code may be a predetermined code or a code generated based on a response code received from the lock control device 11. As the latter method, for example, a response code received by using a predefined function is converted and used as a recognition code.The response code is used to designate a constant number of digits such as π, and a value within a predetermined range from here. Can be considered as a recognition code, a conversion is performed using a predetermined number of digits of the response code as a conversion constant, and the like.

The recognition code thus generated is transmitted to the light emitting unit 2
3 is output to the outside (step S470). Thereafter, the process returns to step S410 to repeat the processing from the signal input. If the signal from the lock control device 11 is not input for a predetermined time, the process returns to step S420.
Is "NO", the process exits to "RTN", and ends this routine.

When the recognition code is output from the key device 10, the interrupt by the signal input to the light receiving section 13 is normally permitted (FIG. 5, step S575), so the signal input interrupt processing shown in FIG. The routine is invoked. When this process is started, first, a process of inputting a series of codes is performed (step S600), and it is determined whether or not the input code can be correctly recognized as a code (step S61).
0). This is because there is a possibility of inputting noise that does not form a body as a code. If it is not a code, the process directly goes to "RTN" and the routine ends once.

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

On the other hand, if the value of the flag F is 1, it is determined whether or not the input code is correct as a recognition code (step S630). If not, the host computer 15 is notified (step S625). If it is correct, the motor 2 of the bar drive mechanism 7 is driven to unlock the door 1 (step S640). Thereafter, the flag F is reset to 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 corresponds to step S in the response code processing routine shown in FIG.
530 to S560 are repeatedly executed, and the key device 10
The lock controller 11 outputs a unique code determined for each locking device, and can be executed immediately after setting the value 1 to the flag F. Accordingly, the response code processing routine shown in FIG.
> 100), if the correct recognition code has been output from the key device 10 by the time the repetition processing is exited, the flag F is reset to the value 0 (FIG. 6, step S650). On the other hand, if any code is not output from the key device 10 within a predetermined time period or if an incorrect code is output, the flag F is set to the value 1
Has been maintained. Accordingly, the value of the flag F is determined (step S580), and if the value of the flag F is 1, it is determined that some abnormality has occurred,
(Step S585). If the value of the flag F is not 1, the processing directly ends at "END" and the processing is terminated.

The key device 10 and the lock control device 11 described above
FIG. 7 shows the exchange of codes with the program. As shown
When the operation button 21 of the key device 10 is operated, the key device 10
A calling code is output from the light emitting unit 12 of the. Receiving the call code, the lock control device 11 outputs, as a response code, 99 random codes and a unique code unique to this set of locking devices, with a header attached thereto. The position of the unique code with respect to the random code is determined by a random number, and differs for each operation of the operation button 21. Therefore, it is not easy to know which code is unique even if the code exchanged between them is monitored from the outside. If the unique code itself is the same every time, it can be detected even if its position is changed. Therefore, only a plurality of digits in a predetermined range of the value of 2 to the power of 20 are valid, and the value outside the range of the number of digits is always used. It is also preferable to change and output the data.

When the unique code is output, the key device 10
Receives this code, generates a recognition code S, and outputs it. Receiving the recognition code S, the lock control device 11 unlocks the door 1 if the recognition code is a correct code. If the recognition code is incorrect or there is no response, the host computer 1
In the case of the door 1 of the hotel, a simple error such as a user trying to open a room other than the guest room by himself or an illegal use of an illegally copied 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 hotelman or a security guard.

When an error code is repeatedly sent to the same door 1, an alarm is output immediately, for example, opening and closing of an elevator door on that floor is prohibited, and departure from that floor is performed. Can be temporarily restricted until the security guard reaches the cabin. Furthermore,
If the guest room is vacant, the person who tries to break in and unlock the room is put in the guest room, and then the host computer 1
It is also possible to lock the door 1 reversely by instructing from 5 to lock in the intruder.

As described above, according to the locking device of this embodiment, the door 1 can be unlocked in a non-contact manner, so that it is easy for the user to handle and the key device 10 is unlocked.
And the lock control device 11 exchange codes and confirm that the combination is a proper combination, and then unlock the door 1. Therefore, there is an advantage that the reliability is extremely high. In particular,
In the locking device of the present embodiment, the exchanged code is 2
Since it is defined as a power value, it is impossible to simply try and unlock all combinations in terms of time, and since the code is exchanged and confirmed, the key device 1
It is virtually impossible to duplicate 0.

The key device 10 and the lock control device 11 of the present embodiment store the unique code of the locking device 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, the EEPROM
A configuration for rewriting the contents of M43 will be described. 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. FIG.

As shown, the host computer 15
Includes a well-known CPU 101, ROM 102, RAM 10
3, an input / output port 105 is provided, and a light receiving unit 113 and a light emitting unit 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,
If the key device 10 is arranged at a position facing the light receiving unit 113 and the light emitting unit 112, optical communication can be performed between the key device 10 and the host computer 15.

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

When this routine starts, the key device 10
EEPRO to know which key device 10 communicates with the host computer 15
A process of outputting the call 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, a 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 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 the new code from the host computer 15 is completed (step S710,
720). Thereafter, when a new code is received from the host computer 15, the new code is written to the EEPROM 43 as a new unique code for specifying the key device 10 (step S730), and this routine ends. In the case where the key device 10 is configured to output a recognition code stored in advance 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 a call code and a recognition code (FIG. 10, step S750). continue,
The host computer 15 performs a process of determining a new unique code for the key device 10 and the lock control device 11 with reference to the table stored in the ROM 102 (step S76).
0). This table stores the correspondence between the guest room numbers of all the guest rooms of the hotel and the unique codes of the locking devices, and refers to the table 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 call code from the key device 10, the host computer 15 can specify which room's lock control device 11 the key device 10 corresponds to. Sending the code to 11 is easy. The lock control device 11 writes the received code into the EEPROM 33.

As a result, by simply operating the operation button 21 in front of the light receiving unit 113 and the light emitting unit 112 of the host computer 15, the unlock code between the key device 10 and the lock control device 11 is changed to a new code. Can be changed to a number. Moreover, at this time, no new code is displayed outside, in other words, the code is updated without being notified to the operator who performs the update operation of the code, so that there is a feature that the reliability is extremely high. Further, the unique code can be updated very easily, and there is no need to replace the entire locking device as in the related art. As a result, the unlocking code can be changed more frequently than in the past, and in this respect also, the reliability can be improved.

The embodiment of the present invention has been described above.
The locking device of the present invention is not limited to these embodiments at all. For example, a configuration applied to a door locking device of an automobile, a configuration applied to a front door of a game device such as a pachinko machine, a remote control for restricting users. Equipped with a display device such as a configuration applied to control devices such as a key device, a configuration enabling not only unlocking but also locking with a key device, and turning on an LED when the lock body receives a proper identification code for unlocking. It goes without saying that the present invention can be implemented in various modes without departing from the gist of the present invention, such as the configuration described above.

In this embodiment, the unique code and the like are stored by using an EEPROM to rewrite the code without removing the PROM from the key device 10 and the lock control device 11. However, the PROM is removed and the writing is performed. If so, a normal PROM or fuse ROM can be used. In this case, it is conceivable that the PROM is taken out and duplicated. However, when the recognition code is generated in the key device 10, if the algorithm for generating the recognition code is stored in the mask ROM in the CPU having the readout prevention mechanism. Even if the PROM is illegally taken out and the unique code is duplicated, it cannot be unlocked. This is because a correct recognition code cannot be output unless the CPU is duplicated.

Similarly, when determining whether or not the unique code corresponding to the key device 10 is included in the response code received from the lock control device 11, the lock control is not performed by checking the simple agreement between the two. The unique code sent from the device 11 is converted by a predetermined algorithm, and then the matching with the unique code stored in the key device 10 is checked.
If it is stored in the OM, a duplicate key cannot be created unless the CPU can duplicate it, and sufficient reliability can be ensured. In these cases, since the reliability of the entire apparatus is improved, the number of digits of the unique code may be reduced to about 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 a door of an automobile, and when the locking device is applied to a door of a pachinko device, a monitoring room of a hall or the like. It should be installed in. Further, in the present embodiment, when the locking device detects a suspicious signal input, the locking device notifies the host computer 15 of the suspicious signal input. In response, the locking device activates the monitoring camera or starts recording on the video. Is also possible.

[0047]

As described above, the locking device of the present invention has an excellent effect that it can be unlocked at least without contact, and that unauthorized duplication of the key device can be made substantially impossible. To play. Although the key device can be unlocked without contact, the key device cannot be duplicated simply by reading the code output from the key device to the outside 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 paired unique response codes to the key device and the response code output means at the same time, thereby unlocking the device. Can be rewritten at any time, and it is easy to further enhance the reliability of the locking device. Therefore, there is no need to replace the entire device with a locking device that is handled by an unspecified number of people, such as a hotel door, and it is not necessary to replace the device. Further, if the present invention is applied to a door of a pachinko gaming machine or the like, a code for unlocking in a pachinko hall can be changed, and the reliability is extremely high.

[Brief description of the 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 one 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 constituting the locking device of the embodiment.

FIG. 4 is a flowchart showing an outline of an operation button interruption 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;

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

FIG. 8 is a block diagram showing a main part of a host computer 15 constituting the 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 showing a procedure on the host computer 15 side.

[Explanation of symbols]

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

──────────────────────────────────────────────────続 き Continued on the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E05B 49/00-49/04

Claims (3)

(57) [Claims] 1. A locking device comprising: a lock body for physically closing a door; and a key device including at least instruction means for instructing an unlocking operation and unlocking the lock body in a non-contact manner. A code output means provided in the device, for outputting a call code in response to an unlock instruction by the instruction means; and when the call code is received, the code output means is defined in advance as a code unique to the key device combined with the lock body. Response code output means for sequentially outputting a signal in which a code is included in a random position with respect to a plurality of response codes; provided in the key device, receiving the plurality of output response codes, and of immediately after recognizing the code corresponding to the response code, the recognition code output means for outputting a recognition code that is generated according to a predetermined or preset procedure, the recognition code, When it received after the output of the serial-specific response code, locking device and a unlock means for the lock body and unlocked. 2. The locking device according to claim 1, wherein each code is exchanged as an optical signal. 3. A writing unit for writing a response code unique to the pair or a code corresponding to the response code to the key device and the response code output unit, which are paired with the locking device according to claim 1. Response code writing device.