JP2007177390A - Dead bolt control mechanism and optical lock - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To inexpensively provide a dead bolt control mechanism with a structure in which a front of a door has no keyhole communicating with a backset and which is not equipped with a thumb-turn, and an optical lock which is equipped with the dead bolt control mechanism. <P>SOLUTION: This dead bolt control mechanism comprises: a spring 12 for elastically urging the dead bolt 11 so that the dead bolt 11 can be housed in or protruded from a lock case 15; a solenoid 20 which is installed outside the lock case 15, so as to make a plunger 21 protrude/recede almost in parallel with a surface of the door depending on a control signal input from a control panel 40; a shaft 13 which is installed almost perpendicularly to the surface of the door, and rotated in such a manner as to be interlocked with the protrusion/receding of the plunger 21 from/into the solenoid; and a cam 14 which is rotated along with the shaft 13, so as to urge the dead bolt 11 in the direction of facing the elastic force of the spring 12 along with the rotation of the shaft 13. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a mechanism for driving and controlling a dead bolt that fully locks a door, and more particularly to a dead bolt control mechanism suitable for a lock system having a structure that does not have a key hole on the front surface of a door and an optical lock using the same.

  An illegal unlocking method called “picking” is used as one of the techniques for illegally entering a residence or the like.

  In recent years, as security consciousness has been improved, locks attached to doors are also used that have high picking resistance. For example, an electric lock is one of them, and some types of electric locks do not have a cylinder attached to the door. Since this type of electric lock does not have a cylinder itself, it cannot be unlocked by picking.

As a prior art relating to an electric lock, there is an “electric locking / unlocking mechanism” disclosed in Patent Document 1.
The invention disclosed in Patent Document 1 causes a dead bolt to appear and disappear by driving a solenoid incorporated in a lock case.
JP 2004-360336 A

  As described above, some electric locks do not have a cylinder, but this is only a small part used as an auxiliary lock. In order to use the electric lock as the main lock, it is necessary to provide a cylinder and a thumb turn as a countermeasure against power failure or failure.

  However, “picking” is not the only trick for unauthorized unlocking. For example, it may be illegally unlocked by another technique such as “turn thumb turn”. As described above, since a general electric lock is provided with a thumb turn, the crime prevention property against the thumb turn is not different from that of a conventional cylinder lock.

  In addition, the invention disclosed in Patent Document 1 has a problem in that the manufacturing cost increases because a backset having a special structure is required.

  Thus, conventionally, there has not been provided a mechanism for moving a dead bolt from a lock case in a structure that does not have a keyhole leading to a back set on the front surface of the door and does not have a thumb turn.

  The present invention has been made in view of such a problem, and provides a dead bolt control mechanism having a structure that does not have a keyhole leading to a backset on the front surface of the door and does not have a thumb turn, and an optical lock including the dead bolt control mechanism. With the goal.

  In order to achieve the above object, according to a first aspect of the present invention, there is provided a dead bolt control mechanism for causing a dead bolt housed in a lock case installed in a door to appear and disappear from the lock case, An elastic member that is housed in the lock case or elastically biased so as to protrude from the lock case, and is installed outside the lock case, and the plunger protrudes and retracts substantially parallel to the surface of the door according to a control signal input from the outside. A solenoid to be moved, a shaft that is installed substantially perpendicular to the surface of the door, rotates in conjunction with the movement of the plunger from the solenoid, rotates with the shaft, and opposes the elastic force of the elastic member as the shaft rotates. A dead bolt control mechanism having a cam for biasing the dead bolt in a direction is provided.

  In the first aspect of the present invention, it is preferable that the linear motion of the plunger is converted into a rotational motion by the crank mechanism and transmitted to the shaft.

  In any of the above-described configurations of the first aspect of the present invention, it is preferable that two solenoids are arranged, and that each solenoid causes the plunger to appear and retract so as to rotate the shaft in the same direction in response to the same control signal. In addition to this, it is more preferable that the solenoid is arranged in a V shape so that the extension lines in the protruding and retracting direction of the plunger intersect in a plane parallel to the door.

  In order to achieve the above object, according to a second aspect of the present invention, there is provided an optical lock using the deadbolt control mechanism according to any one of claims 1 to 4, wherein the control signal is output. The lock case further includes an optical key having a microcomputer chip that stores authentication information and a light emitting element that emits the authentication information as an optical signal based on a command from the microcomputer chip. A means for supplying power to the optical key only when it is a regular optical key, and a light reception for converting an optical signal emitted by the regular optical key arranged at the first authentication position into an electrical signal. An element and a light guide having a shape that allows an optical signal to pass; a means for protecting the light receiving element from being destroyed by a foreign object; A filter that allows only constant light to reach the light receiving element, a determination unit that determines whether or not the electrical signal is authentication information indicating that it is a normal optical key, and a normal optical key at the second authentication position. And detecting means for detecting that the dead bolt is placed in the lock case when the determining means determines that the authentication information is authentic optical key authentication information. A control signal is output, and when the detecting means detects that the regular optical key is placed at the second authentication position, the control signal is output to the solenoid so that the dead bolt protrudes from the lock case. An optical lock is provided.

  ADVANTAGE OF THE INVENTION According to this invention, the deadbolt control mechanism of the structure which does not have the keyhole which leads to a back set on the door front surface, and does not have a thumb turn, and an optical lock provided with this can be provided at low cost.

[First Embodiment]
A preferred embodiment of the present invention will be described.
FIG. 1 shows a configuration of a lock system to which the present invention is applied. This lock system includes a dead bolt control mechanism including a back set 10, solenoids 20 (20 a, 20 b) and a cam 30, a control panel 40, and a key authentication unit 50. The side on which the control panel 40 is installed is “inside”, and the side on which the key authentication unit 50 is installed is “outside”.

The back set 10 has the same configuration as that applied to an existing cylinder lock, and has a dead bolt 11, a spring 12, a shaft 13, and a cam 14, and these are accommodated in a lock case 15. Although not shown in FIG. 1, a mechanism (such as a latch bolt) for idle tightening may be provided.
The dead bolt 11 is a member for permanently fastening the door on which the lock system is installed. The spring 12 biases the dead bolt 11 in a direction in which the dead bolt 11 is accommodated in the lock case 15. One end of the shaft 13 protrudes from the lock case 15, and a cam 30 is attached to a portion protruding from the lock case 15. The cam 14 is fixed to the shaft 13 and rotates together with the shaft 13.

  The solenoid 20 is connected to the control panel 40, and causes the plunger 21 (21a, 21b) to appear and disappear according to a control signal from the control panel 40. The tips of the plungers 21a and 21b are connected to the cam 30 via joints. The solenoid 20 is applicable to either a square shape or a round shape, but is preferably a round shape from the viewpoint of space saving.

  As shown in FIG. 2, each plunger is connected to the cam 30 at a point symmetric with respect to the shaft 13.

  The control panel 40 includes an unlocking switch 41 and a locking switch 42. The control panel 40 includes a computer for driving the solenoid 20 based on the unlock signal or the lock signal input from the key authentication unit 50. In addition, it is preferable that a battery is built in the control panel 40 so that locking and unlocking can be performed even in a situation where commercial power is not supplied.

The key authenticating unit 50 identifies whether or not the key arranged at the unlocking position or the locking position is an authorized one, and when determining that the key is authorized, the key authenticating unit 50 notifies the control panel 40 of an unlocking signal or locking. Output a signal.
The method of authenticating the key is arbitrary, and a publicly known one can be applied. That is, in addition to physical authentication based on the shape of the key, magnetic, electrical, optical or electromagnetic authentication, or an authentication method combining these can be applied.

The operation of the lock system will be described.
First, the operation at the time of unlocking will be described. FIG. 4 shows the flow of the unlocking operation of the lock system. When the lock system is in the locked state, the control panel 40 waits for an unlock signal to be input from the key authenticating unit 50 or for the unlock switch 41 to be pressed (step S101).
When an unlock signal is input from the key authenticating unit 50 or when the unlock switch 41 is pressed (step S101 / Yes), the control panel 40 outputs a control signal to each of the solenoids 20a and 20b (step S102). ).
As shown in FIG. 2, the plunger 21a stored in the locked state protrudes according to the control signal from the control panel 40, and the plunger 21b protruded in the locked state is stored according to the control signal from the control panel. (Step S103). Thereby, torque acts on the cam 30 and rotates counterclockwise, and the shaft 13 fixed to the cam 30 also rotates counterclockwise with this (step S104).

  As shown in FIG. 3, when the shaft 13 rotates counterclockwise, the cam 14 that urges the dead bolt 11 to protrude from the lock case 15 also rotates counterclockwise, and the dead bolt 11 is not urged. For this reason, the dead bolt 11 is accommodated in the lock case 15 by the elastic force of the spring 12 (step S105).

Next, the operation at the time of locking will be described. FIG. 5 shows the flow of the locking operation of the locking system. When the lock system is in the unlocked state, the control panel 40 waits for a lock signal to be input from the key authenticating unit 50 or for the lock switch 42 to be pressed (step S201).
When a lock signal is input from the key authenticating unit 50 or the lock switch 42 is pressed (step S201 / Yes), the control panel 40 outputs a control signal to each of the solenoids 20a and 20b.
As shown in FIG. 2, the plunger 21a that protrudes in the unlocked state is accommodated according to a control signal from the control panel 40, and the plunger 21b that is accommodated in the unlocked state corresponds to a control signal from the control panel. Protruding. Thereby, torque acts on the cam 30 and rotates clockwise, and the shaft 13 fixed to the cam 30 also rotates clockwise together with this.

  As shown in FIG. 3, when the shaft 13 rotates clockwise, the cam 14 also rotates clockwise, overcoming the elastic force of the spring and biasing the dead bolt 11. For this reason, the dead bolt 11 protrudes from the lock case 15.

As described above, since the lock system according to the present embodiment can be configured using an existing backset, it is not only easy to manufacture, but can be installed by replacing an already installed lock device. .
In addition, since there is no need to provide a cylinder for performing the locking / unlocking operation from the outside, there is no risk of unauthorized unlocking by picking.
Furthermore, since the position of the cam (cam 14) that drives the deadbolt is not known from the outside of the door, it is highly resistant to unauthorized unlocking methods other than picking.
Furthermore, since it can be applied to a right-open door or a left-open door, the versatility is high and the manufacturing cost can be reduced.

  In the present embodiment, an example is given in which the shaft 13 is unlocked when rotated counterclockwise, and locked when rotated clockwise. However, when the shaft 13 is rotated clockwise, it is locked counterclockwise. Needless to say, the structure may be unlocked when rotated.

[Second Embodiment]
A second embodiment in which the present invention is suitably implemented will be described. The configuration of the lock system according to this embodiment is the same as that of the first embodiment.
However, in this embodiment, authentication for performing locking / unlocking operations from the outside is performed by an optical authentication device.
FIG. 6 shows an optical authentication apparatus applied to this embodiment.
As shown in FIG. 7, in this optical authentication device, when the key 110 is fitted clockwise to the authentication unit 120 and then rotated clockwise, the key 110 is unlocked (first authentication position). Position). On the contrary, when it is rotated counterclockwise, the key 110 is arranged at the authentication position for locking (second authentication position).

The key 110 includes a microcomputer chip 111, a light emitting element 112, a lens 113, and a power receiving unit 114.
The microcomputer chip 111 stores authentication information indicating that it is a legitimate key. The CPU of the microcomputer chip 111 is preferable because the authentication information can be complicated as the number of bits increases. The light emitting element 112 converts an electrical signal into an optical signal based on a command from the microcomputer chip 111 and outputs the optical signal. For example, the authentication information is output by a digital transmission method by light modulation (light emission ON / OFF switching). As the light emitting element 112, a laser diode (LD), a light emitting diode (LED), or the like can be used. The lens 113 converges the output light of the light emitting element 112. The power receiving unit 114 is disposed so as to be aligned with the power transmitting unit 128 when the key 110 is disposed at the unlocking authentication position.

  The authentication unit 120 includes a control unit 121, a light receiving element 122, a power supply 123, a protection unit 125, a filter unit 126, a key detection sensor 127, a power transmission unit 128, an unlocking switch 129a, and a locking 1 switch 29b.

The control unit 121 determines whether or not the electric signal input from the light receiving element 122 matches the authentication information held by the control unit 121 itself. A command for shifting to the unlocked state is output to the control panel 40.
Further, when the key 110 and the authentication unit 120 are fitted and the key detection switch 127 is closed, the authentication unit 120 is shifted from the standby mode to the operation mode. The standby mode is a state in which power is not supplied from the power source 123 to each unit of the authentication unit 120, and the operation mode is a state in which power is supplied from the power source 123 to each unit of the authentication unit 120. Normally, the authentication unit 120 is in a standby mode, and power saving is realized by setting the operation mode only during the locking / unlocking operation. In addition, when the key 110 is disposed at the unlocking authentication position, the power source 123 is controlled to supply power to the key 110 as necessary.
In addition, the control unit 121 detects the state of the backset 10 and determines whether it is in a locked state or an unlocked state.

The light receiving element 122 converts the received optical signal into an electrical signal and outputs the electrical signal to the control unit 121. As the light receiving element 122, a photodiode (PD), a phototransistor, or the like can be used.
The power supply 123 supplies power to each unit of the authentication unit 120, and also supplies power to the key 110 based on an instruction from the control unit 121 when the key 110 is arranged at the unlocking authentication position. As the power source 123, a battery or a regulated DC power source can be applied.
The power supply 123 saves power by not supplying power to each unit of the authentication unit 20 in the standby mode, and supplies power to each unit of the authentication unit 20 in the operation mode.

The protection means 125 has a hole 251 having a predetermined diameter. The protection means 125 has a function of preventing the light receiving element 122 from being broken by a picking bracket or the like. The protection unit 125 may be a part of a housing wall of a case (not shown) in which the authentication unit 120 is stored, or may be provided separately from the case.
The diameter of the hole 251 is larger than the diameter through which light of a minimum amount necessary for operating the light receiving element 122 can pass, and is not large enough to insert a picking fitting or the like. The diameter of the hole through which light of the minimum amount necessary for operating the light receiving element 122 varies depending on the wavelength of light emitted from the light emitting element 12, the sensitivity of the light receiving element 122, and the like, but is preferably 3 mm or less. . The shape of the hole 251 is not limited to a circle, and may be a rectangle, an ellipse, or the like as long as the size satisfies the above conditions.

The filter unit 126 causes only light having a predetermined wavelength and a predetermined luminance (light amount) or more to reach the light receiving element 122 among the light that has passed through the hole 251. Note that light that satisfies only one of these conditions may reach the light receiving element 122.
For example, a bandpass filter can be applied as means for passing light of a predetermined wavelength. Further, as a means for passing light having a predetermined luminance (light quantity) or more, for example, a polarizing filter or a neutral density filter can be applied.
That is, the characteristics of the filter means 126 can be realized by a configuration having at least one of a band pass filter and a neutral density filter, for example.
Since the band-pass filter allows only light of a predetermined wavelength to pass, it can prevent the light receiving element from detecting an optical signal having a wavelength different from the light emitted from the regular key.
The polarizing filter and the neutral density filter have a function of weakening the luminance of input light. That is, the polarizing filter and the neutral density filter attenuate an optical signal having a predetermined light amount or less to a level at which the light receiving element does not react.

The key detection switch 127 makes the power supply 123 and the control unit 121 conductive when the key 110 and the authentication unit 120 are fitted. For example, when the key 110 is fitted to the authentication unit 120, the key detection switch 127 may cause the protrusion provided on the key 110 to mechanically close the relay, or the relay may be electrically contacted. May be closed.
The power transmission unit 128 makes the power source 123 and the key 110 conductive by matching with the power reception unit 114.
The unlocking switch 129a detects that the key 110 has been placed at the unlocking authentication position. The locking switch 129b detects that the key 110 is placed at the authentication position for locking. As for the unlocking switch 129a and the locking switch 129b, for example, a protrusion provided on the key 110 may mechanically close the relay, or the relay may be closed by electrical contact.

  FIG. 8 shows a state in which the key 110 and the lock 120 are fitted at the fitting position. With reference to this figure, the flow of the unlocking / locking operation by the lock system to which the present invention shown in FIGS. 9 to 11 is applied will be described.

<Common operation for unlocking / locking>
FIG. 9 shows a flow of operations common to unlocking / locking.
First, when the user fits the key 110 and the authentication unit 120 (step S301), the relay of the key detection switch 127 is closed, and power is supplied to the control unit 121 (step S302). The control unit 121 controls the power source 123 to supply power to each unit of the authentication unit 120, and shifts the authentication unit 120 to the operation mode (step S303).
After the authentication unit 120 transitions to the operation mode, the control unit 121 detects the state of the backset 10 and determines whether it is in a locked state or an unlocked state (step S304).

Thereafter, when the user rotates the lock 110, the unlocking switch 129a or the locking switch 129b detects that the key 110 is placed at the unlocking or locking authentication position (step S305).
When the key 110 is arranged at the unlocking authentication position (Yes at Step S306), the unlocking operation shown in FIG. 10 is executed. On the other hand, when the key 110 is placed at the authentication position for locking (step S306 / No), the locking operation shown in FIG. 11 is executed.

<Unlocking action>
FIG. 10 shows the flow of the unlocking operation.
If it is determined in step S304 that it is in the unlocked state (step S401 / No), since there is no need to unlock, the authentication unit 120 shifts to the standby mode (step S411) and ends the operation.
If it is determined that the lock state is established (step S401 / Yes), the processing from step S402 onward is executed.

When the key 110 is placed at the unlocking authentication position, the power transmission unit 128 and the power reception unit 114 are matched. As a result, the power source 123 and the key 110 become conductive, and power is supplied from the power source 123 to each part of the key 110 (step S402).
When power is supplied from the power source 123, the microcomputer chip 111 controls the light emitting element 112 to send dummy data as the optical signal 130 (step S403). The optical signal 130 transmitted from the light emitting element 112 is converged by the lens 113 and input to the filter means 126 through the hole 251.
When the light receiving element 122 receives the optical signal 130 that has passed through the filter means 126, converts it into an electrical signal and inputs it to the control unit 121 (step S404 / Yes), the control unit 121 synchronizes with the dummy data (step S404). 3205).

Thereafter, the microcomputer chip 111 controls the light emitting element 112 to send authentication information as the optical signal 131 (step S406). The optical signal 131 sent out from the light emitting element 112 is converged by the lens 113 and inputted to the filter means 126 through the hole 251. When the light receiving element 122 receives the optical signal 131 that has passed through the filter unit 126, the light receiving element 122 converts the light signal 131 into an electric signal and inputs the electric signal to the control unit 121 (step S407 / Yes).
The control unit 121 determines whether the electrical signal input from the light receiving element 122 matches the authentication information held by the control unit 121 itself (step S408).

  If it is determined that they match (step S408 / Yes), the control unit 121 controls the power supply 123 to stop the supply of power to the key 110 (step S409). The control unit 121 sends an unlock signal to the control panel 40 to shift the unlocking system to the unlocked state (step S410). Thereafter, the supply of power to each unit of the authentication unit 120 is stopped and the process proceeds to the standby mode (step S411), and the process ends.

  On the other hand, if it is determined that they do not match (step S408 / No), the control unit 121 controls the power supply 123 to stop the supply of power to the key 110. Further, the control unit 121 notifies the user of an error using a sounding means (speaker or the like) (not shown) (step S412). Thereafter, the supply of power to each unit of the authentication unit 120 is stopped and the process shifts to the standby mode (step S413), and the process ends.

  When the optical signal input to the filter means 126 does not reach the light receiving element 122 (step S404 / No or step S407 / No), the control unit 121 moves to the key 110 after a predetermined time has elapsed. Is stopped (step S413). Thereafter, the supply of power to each unit of the authentication unit 120 is stopped and the process shifts to a standby state (step S411), and the process ends.

  If it is determined that the authentication information does not match (step S408 / No), the control unit 121 counts this, and if it reaches a predetermined number of times (can be set arbitrarily) within a certain period, You may make it transfer to the state which does not accept the unlocking operation by. This state may be automatically released after a predetermined time.

<Locking action>
FIG. 11 shows the flow of the locking operation.
If it is determined in step S304 that it is locked (step S501 / No), it is not necessary to lock, so the lock 120 shifts to the standby mode (step S503) and ends the operation.

  When determining that it is in the locked state (step S501 / Yes), the control unit 121 sends a locking signal to the control panel 40 to shift the locking system to the locked state (step S502). Thereafter, the authentication unit 120 shifts to the standby mode (step S503) and ends the operation.

  In addition, when a predetermined uneven | corrugated pattern is provided in the key 110 and it is a pattern which is not compatible with the authentication part 120, it is good to make it impossible to fit with the authentication part 120, or to be unable to rotate to the 1st or 2nd authentication position. Alternatively, the unlocking switch 129a or the locking switch 129b may not be operated even if the incompatible key is rotated to the first or second authentication position.

  Since the deadbolt control mechanism according to the present invention does not apply a physical force to the backset from the outside of the door, it can be suitably applied to a lock system that authenticates a key by the above method. .

In addition, the said embodiment is an example of suitable implementation of this invention, and this invention is not limited to this.
For example, in the above embodiment, the dead bolt is urged in a direction to be accommodated in the lock case by the spring, but the dead bolt is urged in a direction protruding from the lock case by the spring, It is good also as a structure accommodated in a lock case by the effect | action of a cam.
In the above embodiment, the configuration in which the two solenoids are installed in a substantially V shape has been described as an example. However, a sufficient force is provided to urge the dead bolt by rotating the shaft (overcoming the elastic force of the spring). In that case, it can be a single unit. Further, the solenoids may be installed so that the two solenoids and the cam are in a crank shape.
The solenoid may be built in the door instead of being installed on the inner surface of the door.
As described above, the present invention can be variously modified.

It is a figure which shows the structure of the lock | rock system concerning 1st Embodiment which implemented this invention suitably. It is a figure which shows the connection state of the plunger which protrudes / projects from a solenoid, and a cam. It is a figure which shows the state in which a deadbolt appears and disappears from a lock case with rotation of a shaft. It is a figure which shows the flow of the unlocking operation | movement of a lock system. It is a figure which shows the flow of the locking operation | movement of a locking system. It is a figure which shows the structure of the optical authentication apparatus applied to the lock system concerning 2nd Embodiment which implemented this invention suitably. It is a figure which shows the authentication position of an optical authentication apparatus. It is a figure which shows the optical authentication apparatus in authenticating a key. It is a figure which shows the flow of operation | movement of an optical authentication apparatus. It is a figure which shows the flow of operation | movement of an optical authentication apparatus. It is a figure which shows the flow of operation | movement of an optical authentication apparatus.

Explanation of symbols

10 Backset 11 Dead Bolt 12 Spring 13 Shaft 14, 30 Cam 15 Lock Case 20 Solenoid 40 Control Panel 41 Unlock Switch 42 Lock Switch 50 Key Authentication Unit 110 Key 111 Microcomputer Chip 112 Light Emitting Element 113 Lens 114 Power Receiving Unit 120 Authentication Unit 121 Control unit 122 Light receiving element 123 Power source 125 Protection unit 126 Filter unit 127 Key detection switch 128 Power transmission unit 129a Unlocking switch 129b Locking switch 130 Optical signal (dummy data)
131 Optical signal (authentication information)
251 holes

Claims (5)

A dead bolt control mechanism for causing a dead bolt housed in a lock case installed in a door to appear and disappear from the lock case,
An elastic member that elastically urges the deadbolt to be accommodated in the lock case or to protrude from the lock case;
A solenoid that is installed outside the lock case and causes the plunger to appear and retract substantially parallel to the surface of the door in response to a control signal input from the outside;
A shaft that is installed substantially perpendicular to the surface of the door and rotates in conjunction with the movement of the plunger from the solenoid;
A dead bolt control mechanism having a cam that rotates together with the shaft and biases the dead bolt in a direction opposite to the elastic force of the elastic member as the shaft rotates.   The dead bolt control mechanism according to claim 1, wherein the linear motion of the plunger is converted into a rotational motion by a crank mechanism and transmitted to the shaft.   The dead bolt control according to claim 1 or 2, wherein two solenoids are arranged, and each solenoid causes the plunger to protrude and retract so as to rotate the shaft in the same direction in response to the same control signal. mechanism.   The dead solenoid control mechanism according to claim 3, wherein the solenoid is arranged in a V shape so that extension lines in the protruding and retracting direction of the plunger intersect in a plane parallel to the door. An optical lock using the dead bolt control mechanism according to any one of claims 1 to 4,
A control device for outputting the control signal;
The lock case is
When an optical key having a microcomputer chip storing authentication information and a light emitting element that emits the authentication information as the optical signal based on a command of the microcomputer chip is disposed at the first authentication position, Means for supplying power to the optical key only if it is a key;
A light receiving element that converts an optical signal emitted from a regular optical key disposed at the first authentication position into an electrical signal;
A light guide path shaped to allow the optical signal to pass through, and means for protecting the light receiving element from being destroyed by foreign matter;
A filter that allows only predetermined light to reach the light receiving element among the light that has passed through the light guide path;
Determining means for determining whether or not the electrical signal is authentication information indicating that it is a regular optical key;
Detecting means for detecting that a regular optical key is arranged at the second authentication position;
The controller is
When the determination means determines that the authentication information is the authorized optical key, the control signal is output to the solenoid so that the dead bolt is housed in the lock case, and the authorized optical key is An optical lock characterized in that, when the detection means detects that it is disposed at a second authentication position, the control signal is output to the solenoid so that the dead bolt protrudes from the lock case.

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