KR20150006560A - Battery Lifetime Increasing Method by Using Drease of Power Consumpution of Difital Door Lock and Digital Door lock System thereof - Google Patents

Battery Lifetime Increasing Method by Using Drease of Power Consumpution of Difital Door Lock and Digital Door lock System thereof Download PDF

Info

Publication number
KR20150006560A
KR20150006560A KR1020130080067A KR20130080067A KR20150006560A KR 20150006560 A KR20150006560 A KR 20150006560A KR 1020130080067 A KR1020130080067 A KR 1020130080067A KR 20130080067 A KR20130080067 A KR 20130080067A KR 20150006560 A KR20150006560 A KR 20150006560A
Authority
KR
South Korea
Prior art keywords
door lock
unit
card
digital door
impedance
Prior art date
Application number
KR1020130080067A
Other languages
Korean (ko)
Inventor
김생수
Original Assignee
주식회사 에스원
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 주식회사 에스원 filed Critical 주식회사 에스원
Priority to KR1020130080067A priority Critical patent/KR20150006560A/en
Publication of KR20150006560A publication Critical patent/KR20150006560A/en

Links

Images

Classifications

    • 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
    • G07C2009/00634—Power supply for the lock
    • G07C2009/00642—Power supply for the lock by battery
    • 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
    • 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
    • G07C2009/00968—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys shape of the data carrier
    • G07C2009/00976—Electronically operated locks; Circuits therefor; Nonmechanical keys therefor, e.g. passive or active electrical keys or other data carriers without mechanical keys shape of the data carrier card

Abstract

Provided are a method of increasing a battery lifetime by reducing power consumption of a digital door lock and a digital door lock system using the same. The digital door lock system includes a door lock body and an RF card. The door lock body (200) includes a control unit (220). The control unit (220) includes a wireless transmission and reception part (230), a memory (240), a signal processing part (250), a door opening and closing part (260), a sensor (270), a power supply (280), a timer (350) and an RF oscillator (290) which are electrically connected to each other such that a signal may be processed. The wireless transmission and reception part (230) is connected to an RF card approach determining part (450) which is connected to and controlled by the control unit (220).

Description

[0001] The present invention relates to a method for extending a battery life by reducing power consumption of a digital door lock, and a digital door lock system using the same,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital door lock system using an RF signal, and the digital door lock is widely used for security purposes in a home or office. As described above, the power supply to the digital door lock used in the home or the like mainly uses the battery, and the battery needs to be replaced with a new battery after a certain period of time. Therefore, in order to increase the battery replacement period, the power consumed in the digital door lock system must be reduced. The present invention relates to a method for reducing power consumption and extending battery life in a digital door lock system.

      The prior art related to the present invention is disclosed in Korean Patent Registration No. 10-0836366 (2008. 06. 09. Announcement) and Registration No. 10-08386567 (2008. 06. 16. Announcement). FIG. 1 is a perspective view of a non-contact type smart digital door lock, and FIG. 2 is a diagram of a digital door lock for a conventional standby current interruption. 1, the non-contact type smart digital door lock includes a door lock main body 10 and a smart card 20. The door lock main body 10 is installed inside the door G and has a main body 12 having main components built therein and a main body 12 provided in a shape corresponding to the main body 12 with the door G interposed therebetween A front body 14 and a door opening and closing part 16 in which a space between the main body 12 and the front body 14 is installed on the door G. [ Here, the main body 12 is configured to perform various functions of a conventional electronic door lock. Further, the front body 14 may be provided with additional functions such as a handle 11. A keypad K for inputting a password is provided on the front surface of the front body 104 so as to open the minute indicating door G of the card key used in a noncontact manner. Is protected by a cover (C), and the keypad cover (C) can be pushed up for operation. Also, the door opening / closing unit 16 may be provided with a dead bolt 18 for locking and unlocking, and a detection sensor 19 for detecting the operation state thereof.

2, the conventional digital door lock for shutting off the standby current includes a battery 110, a power supply unit 120, a door lock main control unit 130, a motor driving unit 140, a piezo driving unit 150, an LED driving unit 160, And the like. The battery 110 is a source for supplying electric power to the components of the digital door lock as in a general battery. When the motor driving unit 140 receives a door opening / closing signal from the main control unit 130, So as to physically open and close the door lock. The LED driving unit 160 corresponds to a component for receiving a numeric string, a character string, or the like from a user or for outputting a guidance message and the like. The piezo driving unit 150 is a component for sensing a button touch of a user And the power supply unit 120 serves to supply power to each component of the digital door lock 100 so that a standby current is not generated. Also, in order to prevent a standby current from being generated, the power supply unit 120 interrupts power supply to the main control unit 130 in the sleep mode of the digital door lock. When the user drives the digital door lock, And the power supply to the main control unit 130 should be restored. When the power is supplied, the conventional digital door lock transmits an RF signal and a command in order to grasp the access of the RF card in the digital door lock main body.

In the conventional technology described above, the standby current is cut off by interrupting the power supply from the power supply unit in the slim mode. However, when entering the slim mode, the user enters the slim mode after completing the requirements of the digital door lock, The RF oscillation unit can not be driven in the case of the RF wireless system. Also, the above-described problem of the conventional technique is that the RF oscillation unit outputs the RF signal for a long time or for a long time. SUMMARY OF THE INVENTION Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a method of extending battery life of a digital door lock by reducing power consumption and a digital door lock system using the same, When the impedance, consumption current, and voltage fluctuation of the output part are sensed and the impedance, the consumption current, and the voltage are detected, the RF command is transmitted to judge whether or not the actual card is accessed.

The digital door lock system using the extension of the battery life through the reduction of power consumption of the present invention has the door lock main body 200 and the RF card 300. The door lock main body 200 is disposed inside the door G A front body provided in a shape corresponding to the main body with the door G interposed therebetween and a space between the main body and the front body are provided on the door G, And a door opening / closing unit 260 incorporated therein. In this case, the main body is configured to perform various functions of a conventional electronic door lock, and additional functions such as a handle may be installed in the front body. The present invention can open / close a door lock in a non-contact manner, and a keypad K for inputting a password can be provided on the front side of the front body so as to open the RF card minute indication door G. In addition, the keypad K is protected by a keypad cover C, and the keypad cover C is pushed up for operation, as in the conventional case. Also, the door opening / closing unit 160 may include a dead bolt for locking and unlocking, and a detection sensor for detecting the operation state thereof. In addition, the door lock main body 200 is provided with a control unit 220 and the control unit 220 includes a wireless transceiver unit 230, a memory unit 240, a signal processing unit 250, a door opening / closing unit 260, The RF transmitter 270 is electrically connected to the power supply unit 280, the timer 350 and the RF oscillator 290 so that signal processing is possible. The RF transceiver unit 230 is connected to the RF card access determiner 450, The card access determination unit is connected to the control unit 220 and controlled. The control unit 220 is a type of microprocessor, and includes a controlling chip such as an MSM used in a mobile communication terminal. The wireless transmitting / receiving unit 230 is an antenna unit that can transmit and receive a wireless signal. The signal processing unit 250 registers the ID and stores the RF oscillation time information, the RF output unit (antenna) impedance, the reference current, and the reference voltage information, And the sensor unit 270 controls the opening and closing of the door G of the user by opening and closing the door by driving the door opening and closing unit 260 when the RF card is accessed. The RF power supply unit 280 includes a battery and is a means for applying power necessary for operation of circuit configurations including the control unit 120. The RF power supply unit 290 includes a RF Is a means for generating an RF signal to radiate electromagnetic waves to the card. The wireless signal used in the water-sending and receiving unit 130 may be RF, Bluetooth, IrDA (Infrared Data Association), and the RF signal may be general wireless processing And Bluetooth is a very useful short distance wireless communication signal having a data transmission speed of 1Mbps within a transmission distance of 10m and IrDA is an infrared communication method useful when performing wireless communication within 1m, but when a shield which infrared rays can not pass through is a barrier Communication is impossible. The sensor unit 270 may be a touch sensor, such as a touch sensor. For example, the sensor unit 270 may be installed on one side of an inner surface, an outer surface, or a side surface of the handle. When the user grips or releases the handle, Or restoration, so as to detect whether or not the user opens the door (G). The RF card 300 is a type of card key having a credit card or a business card size. The RF card 300 includes a wireless transceiver 330 and an electromotive force generator 340. The RF card 300 is, The wireless signal is received by the wireless transceiver 330 from the door lock main body 200 with an IC chip having a microprocessor, an operating system, a security module, a memory, etc., and the electromotive force generating unit 340 generates an electromotive force And the RF card 300 can transmit the ID signal again to the door lock main body through the wireless transceiver 330 while the circuit is driven by the current.

The digital door lock system using the method of extending the battery life by reducing the power consumption of the digital door lock according to the present invention has a short RF emission time and low power consumption, so that the battery can be used for a long time for a long time. In addition, the present invention has the effect of accurately grasping whether the card is approachable or approachable. For example, if the RF output time is reduced from 10 ms to 100 μs in a cycle of 1 second, the effect is reduced to 1/100 of the average current consumption during the active period, and the total current consumption can be reduced by half.

1 is a perspective view of a conventional non-contact smart digital door lock installation state,
FIG. 2 is a diagram showing a digital door lock structure for blocking a conventional standby current,
FIG. 3 is a block diagram of a digital door lock system using battery life extension through power consumption reduction according to the present invention.
4 is a flowchart illustrating a method of extending battery life through reduction of power consumption of a digital door lock according to the present invention.

The method for extending the battery life by reducing the power consumption of the digital door lock of the present invention and the digital door lock system using the same will now be described with reference to FIGS. 3 to 4. FIG.

3 is a block diagram of a digital door lock system using battery life extension through reduction of power consumption according to an embodiment of the present invention. 3, the digital door lock system using the extension of battery life through power consumption reduction of the present invention comprises a door lock main body 200 and an RF card 300. The door lock main body 200 can transmit and receive radio signals A memory unit 240 for storing the RF card ID, the RF oscillation time information, the RF output unit (antenna) reference impedance, the reference current, and the voltage information, A signal processing unit 250 which is a known calculation means for comparing the confirmation ID signal with the registered setting ID to confirm whether or not the card is registered, and a door opening / closing unit A sensor unit 270 for determining whether the user opens the door G and a power supply unit 280 including a battery for supplying power necessary for operation of circuit configurations including the control unit 220, An RF oscillating unit 290 for generating an RF signal for radiating electromagnetic waves to the card, a timer 350 for providing time information, and a controller 350 for detecting the impedance, current or voltage of the radio transceiver 230, A RF card access determination unit 450 for comparing the reference impedance, current, or voltage with the stored reference impedance, current or voltage, and transmitting the determination result to the controller 220, a keypad unit 360 for inputting user requirements and transmitting the user requirement to the controller, A memory unit 240, a signal processing unit 250, a door opening / closing unit 260, a sensor unit 270, an RF card access determination unit 450, a keypad unit 360, and an RF And a control unit 220 for controlling the oscillation unit 290. [ The RF card 300 includes a wireless transceiver 330 and an electromotive force generator 340. When a wireless signal is received by the wireless transceiver 330 from the door lock main body 200, In the generating unit 340, a small current is generated by the induced electromotive force, and the RF card 300 transmits the ID signal to the door lock body again through the wireless transmitting / receiving unit 330 while the circuit is driven by the current . The RF card access determination unit 450 includes an impedance detection unit 451 for detecting an impedance of the wireless transceiver unit 230, a current detection unit 453 for detecting a current of the wireless transceiver unit 230, And a comparison determining unit 455 for comparing the impedance and the current detected by the current detecting unit with the reference impedance and the current to determine whether the impedance is fluctuating and transmitting the determined impedance and current to the control unit 220. [ In the above, the current detecting unit for detecting the current can be replaced with the voltage detecting unit.

4 is a flowchart illustrating a method of extending battery life through reduction of power consumption of a digital door lock according to the present invention. 4, the method of extending the battery life by reducing the power consumption of the digital door lock according to the present invention includes a step S11 of radiating an RF signal to an RF card for a short period of time at a control unit of the digital door lock main body, (S13) of determining whether or not the RF card is accessed by the wireless transmitting / receiving unit of the digital door lock main body, a step (S13) of determining whether the ID received by the digital door lock main body control unit is an ID stored in the memory unit (S14) judging whether or not they match with each other; and (S15) opening and closing the door of the digital door lock main body control unit when the IDs coincide with each other. Also, the short time for radiating the RF signal in the step S11 indicates that the RF signal is radiated for a time in the range of 100 mu s to 150 mu s. Also, the step of determining whether or not the RF card is accessed by the wireless transmitting and receiving unit in step S13 is to detect the impedance and current consumption of the wireless transmitting and receiving unit and judge whether or not the RF card is accessed according to the variation. Also, instead of detecting the consumption current, the voltage may be detected and compared with the reference voltage to judge whether the RF card is approaching or not.

10, 200: Door lock main body, 12: Main body,
14: front body, 19; Detection sensor,
20: smart card, 110: battery,
120: power supply unit, 130: main control unit,
160: LED driving unit, 220: control unit,
230: wireless transmitting / receiving unit, 260: door opening / closing unit,
270: sensor unit, 280: power supply unit,
300: RF card

Claims (8)

In a digital door lock system using a digital door lock main body and an RF card, which extend the life of the battery by reducing the power consumption of opening and closing a door,
The digital door lock system using the battery life extension through the power consumption reduction,
A wireless transceiver 230 configured of a kind of antenna capable of transmitting and receiving a wireless signal;
A memory unit 240 for storing the ID of the RF card, the RF oscillation time information, the RF output unit (antenna) reference impedance, the reference current, and the voltage information;
A signal processing unit 250 which is a known calculation means for comparing the received specific ID signal with the registered setting ID to confirm whether or not they match;
An access door opening / closing part 260 for opening and closing the door by driving when accessing the RF card;
A power supply unit 280 including a battery for supplying power necessary for operation of circuit configurations including the control unit 220;
An RF oscillator (290) for generating an RF signal for radiating electromagnetic waves to an RF card;
A timer 350 for providing time information;
An RF card access determination unit 450 for detecting impedance and current of the wireless transceiver unit 230 to determine whether the impedance and current are fluctuating and transmitting the determination result to the controller 220;
A keypad unit 360 for inputting user requirements to the control unit;
The wireless communication unit 230, the memory unit 240, the signal processing unit 250, the door opening / closing unit 260, the sensor unit 270, the RF card access determination unit 450, the keypad unit 360, A control unit (220) for controlling the control unit (220);
And an RF card (300). The digital door lock system using the extension of battery life through power consumption reduction.
The method according to claim 1,
The RF card access determination unit 450,
An impedance detector 451 for detecting an impedance of the wireless transceiver 230;
A current detector 453 for detecting a current of the wireless transceiver 230;
And a comparator (455) for comparing the impedance and the current detected by the impedance detector and the current detector with the reference impedance and the current to determine whether the impedance is fluctuating and transmitting the determined impedance and current to the controller (220) Digital door lock system with extended life.
3. The method of claim 2,
The digital door lock system using the battery life extension through the power consumption reduction,
And a sensor unit (270) for determining whether the user opens the door (G). The digital door lock system using the extension of battery life through power consumption reduction.
1. A method for extending the life of a digital door lock by reducing the power consumption of a door comprising a digital door lock main body and an RF card,
A method of extending battery life of a digital door lock by reducing power consumption,
(S11) a control section of the digital door lock main body emits an RF signal to an RF card for a short time at an RF oscillation section;
(S12) of activating the RF card and transmitting the ID to the digital door lock main body;
A step (S13) of judging whether or not the RF card is accessed by the wireless transmitting / receiving unit of the digital door lock main body;
(S14) judging whether or not the ID received by the digital door lock main body control unit coincides with the ID stored in the memory unit;
And a step (S15) of opening and closing a door of the digital door lock main body control unit when the IDs coincide with each other.
5. The method of claim 4,
During the short time,
Wherein the power consumption of the digital door lock is in the range of 100 μs to 150 μs.
5. The method of claim 4,
The step S13 of determining whether the RF transceiver unit accesses the RF card includes:
Wherein the step of detecting the impedance and the consumption current of the wireless transmitting / receiving unit (antenna) and determining whether the RF card is accessed or not is determined.
5. The method of claim 4,
The step S13 of determining whether the RF transceiver unit accesses the RF card includes:
Wherein the step of detecting the impedance and the voltage of the wireless transmitting / receiving unit (antenna) and determining whether the RF card is accessed according to the detected impedance and voltage is determined.
1. A method for extending the life of a digital door lock by reducing the power consumption of a door comprising a digital door lock main body and an RF card,
A method of extending battery life of a digital door lock by reducing power consumption,
(S11) a control unit of the digital door lock main body radiates an RF signal to an RF card for a period of 100 μs to 150 μs at an RF oscillation unit;
(S12) of activating the RF card and transmitting the ID to the digital door lock main body;
(S13) of detecting an impedance and a consumption current of the wireless transmitting / receiving unit (antenna) and judging whether or not the RF card is accessed according to the variation;
(S14) judging whether or not the ID received by the digital door lock main body control unit coincides with the ID stored in the memory unit;
And a step (S15) of opening and closing a door of the digital door lock main body control unit when the IDs coincide with each other.


KR1020130080067A 2013-07-09 2013-07-09 Battery Lifetime Increasing Method by Using Drease of Power Consumpution of Difital Door Lock and Digital Door lock System thereof KR20150006560A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
KR1020130080067A KR20150006560A (en) 2013-07-09 2013-07-09 Battery Lifetime Increasing Method by Using Drease of Power Consumpution of Difital Door Lock and Digital Door lock System thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
KR1020130080067A KR20150006560A (en) 2013-07-09 2013-07-09 Battery Lifetime Increasing Method by Using Drease of Power Consumpution of Difital Door Lock and Digital Door lock System thereof

Publications (1)

Publication Number Publication Date
KR20150006560A true KR20150006560A (en) 2015-01-19

Family

ID=52569855

Family Applications (1)

Application Number Title Priority Date Filing Date
KR1020130080067A KR20150006560A (en) 2013-07-09 2013-07-09 Battery Lifetime Increasing Method by Using Drease of Power Consumpution of Difital Door Lock and Digital Door lock System thereof

Country Status (1)

Country Link
KR (1) KR20150006560A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20170041615A (en) * 2015-10-07 2017-04-17 삼성전자주식회사 Memory module comprising variable delay element and installing method for delay thereof
US10347064B2 (en) 2016-12-30 2019-07-09 Linkelectronics Co., Ltd. Digital door lock system using wireless power transmission
KR102277821B1 (en) * 2020-07-09 2021-07-16 김영조 CORDLESS CONTROLLED BATTERY MODULE APPARATUS BASED IoT FOR DIGITAL DOORLOCK AND CONTROL METHOD THEREOF

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20170041615A (en) * 2015-10-07 2017-04-17 삼성전자주식회사 Memory module comprising variable delay element and installing method for delay thereof
US10347064B2 (en) 2016-12-30 2019-07-09 Linkelectronics Co., Ltd. Digital door lock system using wireless power transmission
KR102277821B1 (en) * 2020-07-09 2021-07-16 김영조 CORDLESS CONTROLLED BATTERY MODULE APPARATUS BASED IoT FOR DIGITAL DOORLOCK AND CONTROL METHOD THEREOF
WO2022010027A1 (en) * 2020-07-09 2022-01-13 김영조 Wirelessly-controlled battery module device for digital door lock that can be based on iot, and control method therefor

Similar Documents

Publication Publication Date Title
US8774714B2 (en) External power supply system for a lock comprising NFC-type contactless communication means
CN105338486B (en) Multiband identification and ranging
CA2370848C (en) Low-power radio frequency identification reader
US7283034B2 (en) Object sensor and controller
US9184598B2 (en) Signal discrimination for wireless key fobs and interacting systems
JP5271183B2 (en) Communication apparatus and communication method
US20120007712A1 (en) Non-contact control method and device
US20080265023A1 (en) Wireless Access Control Reader
US10319161B2 (en) System and method for keyless access control system
CN102270314A (en) Non-contact control method and device
KR100966526B1 (en) A noncontact type door lock system and its control method
KR20190081118A (en) Apparatus and method for controlling vehicles
KR20150006560A (en) Battery Lifetime Increasing Method by Using Drease of Power Consumpution of Difital Door Lock and Digital Door lock System thereof
JP2016030894A (en) Electric lock system
CN113470220A (en) System and method for improving security during electronically controlled key candidate functions
KR102323784B1 (en) Low power smart key lock system using rf signal
KR20190000536U (en) Digital Door-Lock System
KR20180136784A (en) Digital Door-Lock System
JP4831501B2 (en) Wireless communication device and wireless communication system
KR101425507B1 (en) Card reader to go in and out of the security area
JP5496501B2 (en) Battery-operated electronic key and electric lock system using the same
KR20230015074A (en) Method for charging emergency power of the lock device
KR101529464B1 (en) Digital Door-lock Device with Smart Sensor
CN113463978A (en) System and method for optimized electronically controlled key backup function
JP2020041412A (en) Portable machine

Legal Events

Date Code Title Description
A201 Request for examination
E902 Notification of reason for refusal
E601 Decision to refuse application