KR20120134608A - The door-lock apparatus available to open and shut automatically and method for opening and shuting automatically door using the same - Google Patents

The door-lock apparatus available to open and shut automatically and method for opening and shuting automatically door using the same Download PDF

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Publication number
KR20120134608A
KR20120134608A KR1020110053648A KR20110053648A KR20120134608A KR 20120134608 A KR20120134608 A KR 20120134608A KR 1020110053648 A KR1020110053648 A KR 1020110053648A KR 20110053648 A KR20110053648 A KR 20110053648A KR 20120134608 A KR20120134608 A KR 20120134608A
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KR
South Korea
Prior art keywords
signal
smart key
door
closing
door lock
Prior art date
Application number
KR1020110053648A
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Korean (ko)
Inventor
김승일
박기동
Original Assignee
(주)씨앤에스 테크놀로지
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Priority to KR1020110053648A priority Critical patent/KR20120134608A/en
Publication of KR20120134608A publication Critical patent/KR20120134608A/en

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    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit
    • G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
    • G07C9/00309—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated with bidirectional data transmission between data carrier and locks
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07C—TIME OR ATTENDANCE REGISTERS; REGISTERING OR INDICATING THE WORKING OF MACHINES; GENERATING RANDOM NUMBERS; VOTING OR LOTTERY APPARATUS; ARRANGEMENTS, SYSTEMS OR APPARATUS FOR CHECKING NOT PROVIDED FOR ELSEWHERE
    • G07C9/00—Individual registration on entry or exit
    • G07C9/00174—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys
    • G07C2009/00753—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by active electrical keys
    • G07C2009/00769—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys operated by active electrical keys with data transmission performed by wireless means

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  • Engineering & Computer Science (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Lock And Its Accessories (AREA)

Abstract

The present invention relates to a door lock device capable of automatically opening and closing the door and an automatic door opening and closing method using the same. When the authentication for the smart key is successful, not only the unlocking of the door but also the opening and closing of the door are made automatically, when both hands are burdened. The user can automatically open the door without pressing the open button or turning the door handle by hand, thereby maximizing user convenience.

Description

The door-lock apparatus available to open and shut automatically and method for opening and shuting automatically door using the same}

The present invention relates to a door lock device capable of automatic door opening and closing and an automatic door opening and closing method using the same. More specifically, when the authentication for the smart key is successful, not only the door is unlocked but also the door is automatically opened and closed. It relates to a door lock device that can maximize the properties and automatic door opening and closing method using the same.

In general, a mechanical door lock that uses a key to open and close a door is mainly used as a door lock device for an office, a hotel, an apartment, a factory, and the like. However, the conventional mechanical door lock must be carried by the user when the user must go out, if the key is lost can not open and close the door, there is a problem that the security of the weakness of the key is easy to duplicate.

Due to these problems, a digital door lock of a type that opens and closes a door using a security card or a password is widely used these days. However, in the case of the digital door lock, there is a problem in that inconvenience is still present from the user's point of view because it requires a series of actions for user authentication, for example, contact of a security card, input of a password, etc. in order to unlock the door. .

For example, in the case of a door lock using a security card, when the user touches the security card to the door lock, the card reader inside the door lock checks the information registered on the security card, and then unlocks the door. In order to solve the inconvenience, the user must remove the security card from the pocket or the bag and contact the door lock.

In addition, in the case of a door lock using a password, when the user enters the password through the keypad mounted on the door lock, it checks whether it matches the registered password, and unlocks the door. There is still a problem with the inconvenience because you must press the password directly. In addition, there are many unspecified people entering and leaving the institute or the company, so there is a risk of password leakage when the user presses the password.In the absence of the user, the visitor must be informed of the password and the user must change the password. There is discomfort.

In order to solve this problem, recently, a non-contact door lock device has been disclosed that further enhances user convenience by allowing a user to release a lock by simply carrying a smart key using RFID technology.

1 is a view showing a conventional non-contact door lock device.

Referring to FIG. 1, in the conventional non-contact door lock device, when a user carries the smart key 10 and approaches the door lock main body 20, a low frequency from the door lock main body 20 to the smart key 10 is LF (Low Frequency). ) Transmits a signal to activate the smart key 10, and receives a radio frequency (RF) signal including a smart key ID as a response to the LF signal from the smart key 10, based on the smart ID If the authentication is successful by performing authentication on the smart key 20, the door is unlocked.

That is, according to the conventional non-contact door lock device, the user can unlock the door only by holding the smart key 10 without removing the smart key 10 from the pocket or bag.

However, in the conventional non-contact door lock device, even if the door is unlocked, in order to actually open the door, the user needs to turn the door handle 30 by hand or press the release button 40, so that the user is burdened with both hands. There is a problem that can not open the door is still inconvenient for the user.

In order to solve this problem, in large buildings such as research institutes, companies, and public institutions, when the door is unlocked by the non-contact door lock device, the door is automatically opened and closed by using the automatic door opening device. Since installation cost is expensive and power consumption is high, it is difficult to install at the entrance of small businesses, homes, etc. in reality.

The present invention has been made to solve the conventional problems as described above, the object of the present invention is to open and close the door automatically as well as unlocking the door when the authentication for the smart key is successful, separately opened button It is to provide a door lock device that can automatically open the door without pressing or turning the door handle by hand and an automatic door opening and closing method using the same.

In order to achieve the above object, a door lock device capable of opening and closing an automatic door according to an embodiment of the present invention includes a smart key storing authentication information necessary for authentication; And transmitting a low frequency (LF) signal for activating the smart key to the smart key existing within a communication range, and including the authentication information and a command code as a response to the LF signal from the smart key. And a door lock body that receives the signal and performs authentication on the smart key based on the authentication information included in the RF signal, and releases the door lock when authentication is successful. When the command code included in the signal is a door opening and closing command code, the door is automatically opened and closed.

Preferably, the smart key, a button input unit for the user's button input; A memory unit storing authentication information of the smart key; An LF receiver configured to receive an LF signal for activating the smart key from the door lock body; A smart key controller activating a corresponding smart key in response to the received LF signal and generating the RF signal including the authentication information and a command code; And an RF transmitter configured to transmit the generated RF signal to the door lock main body, wherein the smart key controller is configured according to the input of the automatic door open / close button when an automatic door open / close button is input from the button input unit by a user. Storing a door open / close command code in the memory unit, and when the LF signal is received from the door lock body, activates the corresponding smart key in response to the LF signal, and authenticates the authentication information of the smart key as a response to the LF signal. And generating an RF signal including the door opening and closing command code.

Preferably, the door lock body, the sensor for detecting that the user holding the smart key is close to output a detection signal; An LF transmitter for transmitting an LF signal for activating the smart key to the smart key existing within a communication range when a detection signal is input from the sensor; An RF receiver configured to receive the RF signal including the authentication information and the command code as a response to the LF signal from the smart key; A memory unit storing door lock setting information; A smart key authentication unit configured to perform authentication on the smart key based on the authentication information included in the RF signal; A lock releasing unit for releasing the lock of the door if authentication of the smart key is successful; A door opening and closing unit for automatically opening and closing a door when the command code included in the RF signal is a door opening and closing command code; And a door lock control unit which controls the operation of each unit as a whole.

Preferably, the door opening and closing portion is characterized in that the door can be opened for a predetermined time by the restoring force of the spring by the hook.

On the other hand, the automatic door opening and closing method according to an embodiment of the present invention, (a) the door lock body transmits a low frequency (LF) signal for activation of the smart key to the smart key that exists within the communication range, and to the smart key Receiving a radio frequency (RF) signal including authentication information and a command code of the smart key as a response to the LF signal; (b) unlocking the door if authentication is successful by performing authentication on the smart key based on the authentication information included in the RF signal; And (c) automatically opening or closing the door when the command code included in the RF signal is a door open / close command code.

Preferably, in the step (a), when the automatic door opening and closing button provided in the smart key is input by the user, a first door for storing the door opening and closing command code according to the input of the automatic door opening and closing button in the smart key step; A second step of transmitting an LF signal for activating the smart key from the door lock body to the smart key existing within a communication range; When the LF signal is received from the door lock main body, the smart key is activated in response to the LF signal, and the authentication information of the smart key and the door opening / closing command code are included in response to the LF signal. Generating an RF signal and transmitting the RF signal to the door lock body; And receiving a RF signal including the authentication information of the smart key and the door open / close command code from the door lock main body.

Preferably, in the second step, if it is detected that the user holding the smart key is close to the sensor, and transmits the LF signal for the activation of the smart key from the door lock body to the smart key existing within the communication range It further comprises a step.

Preferably, in the step (c), if the command code included in the RF signal is a door opening and closing command code, the step of allowing the door to be opened for a predetermined time by the restoring force of the spring by the hook .

According to the present invention, if the authentication for the smart key is successful, as well as unlocking the door as well as opening and closing of the door is made automatically, if you hold the baggage in both hands automatically open the door without pressing the open button or turn the door handle by hand It can be effective to maximize the user's convenience.

In addition, in the conventional non-contact door lock device, since the LF signal must be periodically transmitted to detect the proximity of the smart key on the door lock main body side, there is a problem in that the power of the door lock main body is consumed a lot. Only when it is detected that the user is close to the door lock body, the door lock body transmits an LF signal for activating the smart key, thereby reducing power consumption of the door lock body.

1 is a view showing a conventional non-contact door lock device.
2a and 2b are views for explaining the configuration and operation of the door lock device according to an embodiment of the present invention.
3 is a view showing an automatic door opening and closing method according to an embodiment of the present invention.
4 is a diagram illustrating a data frame structure of an RF signal used in the present invention.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings, so that those skilled in the art can easily carry out the technical idea of the present invention. In the following description of the preferred embodiments of the present invention, when it is determined that the detailed description of the related known technology may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted or briefly described.

2a and 2b are views for explaining the configuration and operation of the door lock device according to an embodiment of the present invention.

2A and 2B, a door lock device according to an embodiment of the present invention includes a smart key 100 possessed by a user and a door lock body 200 installed at an entrance door.

The smart key 100 may include a button input unit 110 for inputting a button of a user, a memory unit 120 storing authentication information (for example, a smart key ID) for authentication of a smart key, and the door lock main body ( LF receiving unit 130 for receiving the LF signal for the activation of the smart key from the 200, the smart key controller 140 for activating the corresponding smart key as a response to the received LF signal and generates an RF signal, and It is configured to include an RF transmitter 150 for transmitting the generated RF signal to the door lock body 200.

Here, the RF signal includes the authentication information of the smart key 100 and a command code of a command to be performed in the door lock body 200 according to the button input of the button input unit 110.

The door lock main body 200 includes a sensor 210 for detecting a proximity user, an LF transmitter 220 for transmitting the LF signal for activation to the smart key 100, and the smart key 100 from the smart key 100. An RF receiver 230 for receiving the RF signal as a response to the LF signal, a memory unit 240 for storing door lock setting information, and authentication information included in the RF signal for the smart key 100. The smart key authentication unit 250 for performing authentication, the unlocking unit 260 for releasing the door lock when the authentication for the smart key succeeds, and the command code included in the RF signal is a door open / close command code. In this case, the door is configured to include a door opening and closing unit 270 for automatically opening and closing the door, and a door lock control unit 280 for controlling the operation of the respective parts as a whole.

For convenience of description, in the present embodiment, only the door is unlocked when the user does not input any button on the button input unit 110, and when the user inputs the automatic door opening / closing button 111, the door is unlocked. Rather, the door is automatically opened and closed.

First, when the user holding the smart key 100 inputs the automatic door opening / closing button 111 in the button input unit 110, the smart key control unit 140 according to the input of the automatic door opening / closing button 111. The door open / close command code is stored in the memory unit 120.

When the user holding the smart key 100 approaches the door lock main body 200, the sensor 210 of the door lock main body 200 detects that the user is close and outputs a detection signal.

Here, the sensor 210 may use an object recognition sensor that detects a user in proximity to the ultrasound or infrared rays, and a shock sensor that detects the user impacting a body part (foot, body, etc.).

When the detection signal is input from the sensor 210, the LF transmitter 220 transmits an LF signal for activating the smart key 100 to the smart key 100 within the communication range.

When the LF signal is received by the LF receiver 130 of the smart key 100, the smart key controller 140 activates the corresponding smart key as a response to the LF signal, generates an RF signal, and generates the RF transmitter. Transfer to the door lock body 200 through 150.

Here, the RF signal includes a smart key ID and a door open / close command code, and the RF signal will be described in more detail below.

When the RF signal is received by the RF receiver 230 of the door lock body 200, the smart key authentication unit 250 authenticates the smart key 100 based on the smart key ID included in the RF signal. Do this.

When the authentication for the smart key is successful, the unlocking unit 260 unlocks the door, and the door opening and closing unit 270 automatically opens the door when the command code included in the RF signal is a door opening and closing command code. Open and close

Here, the door opening and closing portion 270 may use a means for opening the door by a restoring force of the spring for a predetermined time by the hook, when the door is closed, the physical energy is stored in the spring again, and later the door by the restoring force of the spring again To be opened.

That is, when a user first inputs the automatic door opening / closing button 111 in the smart key 100 and approaches the door lock body 200, the door lock body 200 sends an LF signal to the smart key 100. Activates the smart key 100, receives an RF signal as a response to the LF signal from the smart key 100, and transmits the received RF signal to the corresponding smart key 20 based on the smart key ID included in the RF signal. If the authentication is successful by performing the authentication, the door is unlocked, and the door is automatically opened and closed according to the door open / close command code included in the RF signal.

Therefore, in the related art, although the door has been unlocked, the user has to turn the door handle 30 by hand or press the open button 40 to open the door. In the non-contact door lock device of the present invention, if the automatic door opening and closing button 111 is input in advance and the smart key 100 is approached within a predetermined distance and the authentication is successful, not only the door is unlocked but also the door is opened and closed automatically. , User convenience can be maximized.

In addition, in the case of the conventional non-contact door lock device, since the LF signal for activating the smart key must be periodically transmitted, there is a problem that the power of the door lock body is consumed a lot, but the non-contact door lock device of the present invention is detected from the sensor 210. Since the LF signal for activating the smart key 100 is transmitted only when a signal is input, it is possible to drastically reduce the power consumption of the door lock body.

Hereinafter, the automatic door opening and closing method according to the present invention will be described in more detail.

3 is a view showing an automatic door opening and closing method according to an embodiment of the present invention.

Referring to FIG. 3, when the automatic door opening and closing button 111 is input from the smart key 100 by the user (S301), the door opening and closing according to the input of the automatic door opening and closing button 111 is input from the smart key 100. The command code is stored in the memory unit 120 (S303).

Next, when the user holding the smart key 100 approaches the door lock main body 200, the door lock main body 200 detects that the user is close via the sensor 210 (S305). The LF signal for activating the key 100 is transmitted to the smart key 100 (S307).

As such, since the door lock main body 200 transmits the LF signal only when the smart key 100 is in close proximity, the door lock main body 200 can significantly reduce power consumption compared to the case in which the LF signal is periodically transmitted.

Next, in the smart key 100, when the LF signal is received from the door lock main body 200 (S309), the smart key 100 activates the operation of the smart key in response to the LF signal, and includes a smart key ID and a command code. The RF signal is generated and transmitted to the door lock body 200 (S311 to S313).

Here, the RF signal includes a smart key ID required for authentication of the smart key 100 and a command code of a command to be performed in the door lock body 200 according to a button input of the automatic door opening / closing button 111. This will be described with reference to FIG. 4.

4 is a diagram illustrating a data frame structure of an RF signal used in the present invention.

Referring to Figure 4, the RF signal data frame used in the present invention, the door lock (lock), door unlock (unlock), door open (door open), smart key registration (key reg), such as the door lock body Command code 410 of the command to be performed at 200, Function Code 420 representing a function for executing the command, ID 430 of the smart key, RF signal transmission Rolling code 440 indicating the number of times, encryption code 450 used to encrypt the RF signal, power level VVO code 460 of the smart key, error detection and correction of the RF signal CRC code (Cyclic Redundancy Check Code) 470 and the like are included.

That is, when the automatic door opening and closing button 111 is input from the smart key 100 by the user, the RF signal includes a door opening and closing command code (door open) together with the smart key ID.

Next, when the RF signal is received at the door lock body 200 (S315), the smart key ID included in the RF signal is checked to match the registered smart key ID (S317), and if the corresponding smart key ( The authentication for 100 is performed (S319), and the door is unlocked (S321).

Then, the door lock main body 200 automatically opens and closes the door according to the door open / close command code if the command code included in the RF signal is the door open / close command code (S323).

If the smart key ID included in the RF signal does not match the registered smart key ID, the door is kept locked (S327). If an RF signal is received from another smart key, the above smart key authentication, door unlocking, Automatic door opening and closing procedure.

That is, in the related art, although the door is unlocked, the user has to turn the door handle 30 by hand or press the release button 40 to open the door. According to the present invention, if the user inputs the door automatic opening / closing button 111 in the smart key 100 and the smart key 100 is approached within a predetermined distance and authentication is successful, the opening and closing of the door is automatically performed as well as unlocking the door. Since it is to be made, it is possible to maximize the user's convenience.

Meanwhile, in the present exemplary embodiment, the unidirectional RF communication method for transmitting an RF signal from the smart key 100 to the door lock body 200 is described. However, bidirectional RF communication between the smart key 100 and the door lock body 200 is performed. Of course, it is also possible to configure to be possible.

So far, the present invention has been described based on the preferred embodiments. However, embodiments of the present invention is provided to those skilled in the art to more fully describe the present invention, the scope of the present invention is not limited to the above embodiments, various other Of course, the shape can be modified.

100: smart key
110: button input unit
120: memory
130: LF receiver
140: smart key control unit
150: RF transmitter
200: door lock body
210: sensor
220: LF transmitter
230: RF receiver
240: memory
250: smart key authentication unit
260: unlocking part
270: door opening and closing portion
280: door lock control unit

Claims (10)

A smart key storing authentication information required for authentication; And
A RF (Low Frequency) signal for activating the smart key is transmitted to the smart key existing within a communication range, and RF (Radio Frequency) including the authentication information and a command code as a response to the LF signal from the smart key. Receiving a signal and performing authentication on the smart key based on the authentication information included in the RF signal to include a door lock main body that unlocks the door if authentication succeeds.
And the door lock main body automatically opens and closes the door when the command code included in the RF signal is a door open / close command code.
The method of claim 1, wherein the smart key,
A button input unit for inputting a button by a user;
A memory unit storing authentication information of the smart key;
An LF receiver configured to receive an LF signal for activating the smart key from the door lock body;
A smart key controller activating a corresponding smart key in response to the received LF signal and generating the RF signal including the authentication information and a command code; And
It includes an RF transmitter for transmitting the generated RF signal to the door lock body,
The smart key control unit,
When the automatic door opening and closing button is input from the button input unit by the user, the door opening and closing command code according to the input of the automatic door opening and closing button is stored in the memory unit, and when the LF signal is received from the door lock body, the LF Activate the corresponding smart key in response to the signal, the door lock device capable of automatic door opening and closing, characterized in that to generate an RF signal including the authentication information of the smart key and the door opening and closing command code in response to the LF signal.
According to claim 2, The door lock body,
A sensor for detecting that a user possessing the smart key is close and outputting a detection signal;
An LF transmitter for transmitting an LF signal for activating the smart key to the smart key existing within a communication range when a detection signal is input from the sensor;
An RF receiver configured to receive the RF signal including the authentication information and the command code as a response to the LF signal from the smart key;
A memory unit storing door lock setting information;
A smart key authentication unit configured to perform authentication on the smart key based on the authentication information included in the RF signal;
A lock releasing unit for releasing the lock of the door if authentication of the smart key is successful;
A door opening and closing unit for automatically opening and closing a door when the command code included in the RF signal is a door opening and closing command code; And
The door lock device capable of opening and closing the automatic door, characterized in that it comprises a door lock control unit for controlling the operation of each part as a whole.
The method of claim 3, wherein the RF signal,
A function code indicating a function for executing the command, a rolling code indicating the number of transmissions of the RF signal, an encryption code used to encrypt the RF signal, a power level of the smart key, and an error detection and correction of the RF signal Door lock device capable of opening and closing automatic door, characterized in that it further comprises at least one of the CRC code for.
The method of claim 3,
The door opening and closing part is a door lock device capable of opening and closing automatic doors, characterized in that the door can be opened for a predetermined time by the restoring force of the spring by the hook.
(a) transmits a low frequency (LF) signal for activating the smart key from the door lock body to a smart key existing within a communication range, and authenticates and commands authentication information of the smart key as a response to the LF signal from the smart key; Receiving a radio frequency (RF) signal including a code;
(b) unlocking the door if authentication is successful by performing authentication on the smart key based on the authentication information included in the RF signal; And
and (c) automatically opening and closing the door when the command code included in the RF signal is a door open / close command code.
The method of claim 6, wherein in step (a),
A first step of storing a door open / close command code according to the input of the automatic door open / close button in the smart key when a smart door open / close button provided in the smart key is input by a user;
A second step of transmitting an LF signal for activating the smart key from the door lock body to the smart key existing within a communication range;
When the LF signal is received from the door lock main body, the smart key is activated in response to the LF signal, and the authentication information of the smart key and the door opening / closing command code are included in response to the LF signal. Generating an RF signal and transmitting the RF signal to the door lock body; And
And a fourth step of receiving, at the door lock body, an RF signal including authentication information of the smart key and the door open / close command code.
The method of claim 7, wherein the RF signal,
A function code indicating a function for executing the command, a rolling code indicating the number of transmissions of the RF signal, an encryption code used to encrypt the RF signal, a power level of the smart key, and an error detection and correction of the RF signal At least one of the CRC code for the automatic door opening and closing method further comprising.
The method of claim 7, wherein in the second step,
If it is detected that the user holding the smart key is close to the sensor, the door lock body further comprises the step of transmitting an LF signal for the activation of the smart key to the smart key existing within the communication range Automatic door opening and closing method.
The method of claim 7, wherein in step (c),
If the command code included in the RF signal is a door opening and closing command code, the automatic door opening and closing method further comprising the step of allowing the door to be opened for a predetermined time by the restoring force of the spring by the hook.
KR1020110053648A 2011-06-03 2011-06-03 The door-lock apparatus available to open and shut automatically and method for opening and shuting automatically door using the same KR20120134608A (en)

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KR1020110053648A KR20120134608A (en) 2011-06-03 2011-06-03 The door-lock apparatus available to open and shut automatically and method for opening and shuting automatically door using the same

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Application Number Priority Date Filing Date Title
KR1020110053648A KR20120134608A (en) 2011-06-03 2011-06-03 The door-lock apparatus available to open and shut automatically and method for opening and shuting automatically door using the same

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20170086723A (en) 2016-01-18 2017-07-27 (주)링크일렉트로닉스 Control method and apparatus of proximity access controller
KR20180065057A (en) * 2016-12-06 2018-06-18 (주)링크일렉트로닉스 Bluetooth digital door lock control system using the smartphone and Control method thereof
KR20210013438A (en) * 2019-07-25 2021-02-04 주식회사 코아솔루션 Low power smart key lock system using rf signal

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20170086723A (en) 2016-01-18 2017-07-27 (주)링크일렉트로닉스 Control method and apparatus of proximity access controller
KR20180065057A (en) * 2016-12-06 2018-06-18 (주)링크일렉트로닉스 Bluetooth digital door lock control system using the smartphone and Control method thereof
KR20210013438A (en) * 2019-07-25 2021-02-04 주식회사 코아솔루션 Low power smart key lock system using rf signal

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