WO2018190655A1 - Terminal mobile - Google Patents

Terminal mobile Download PDF

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Publication number
WO2018190655A1
WO2018190655A1 PCT/KR2018/004300 KR2018004300W WO2018190655A1 WO 2018190655 A1 WO2018190655 A1 WO 2018190655A1 KR 2018004300 W KR2018004300 W KR 2018004300W WO 2018190655 A1 WO2018190655 A1 WO 2018190655A1
Authority
WO
WIPO (PCT)
Prior art keywords
unit
antenna
hole
power supply
mobile terminal
Prior art date
Application number
PCT/KR2018/004300
Other languages
English (en)
Korean (ko)
Inventor
송영민
황보창
Original Assignee
주식회사 블루버드
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 블루버드 filed Critical 주식회사 블루버드
Publication of WO2018190655A1 publication Critical patent/WO2018190655A1/fr

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Classifications

    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
    • H04M1/0249—Details of the mechanical connection between the housing parts or relating to the method of assembly
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
    • H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
    • H01Q1/243—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/02—Constructional features of telephone sets
    • H04M1/0202—Portable telephone sets, e.g. cordless phones, mobile phones or bar type handsets
    • H04M1/026—Details of the structure or mounting of specific components
    • H04M1/0277—Details of the structure or mounting of specific components for a printed circuit board assembly

Definitions

  • the present invention relates to a mobile terminal, and more particularly, to a mobile terminal in which a multiple input multiple output (MIMO) antenna system is used.
  • MIMO multiple input multiple output
  • a mobile terminal is a terminal capable of wirelessly communicating voice or video data while moving regardless of a place.
  • a mobile terminal such as a mobile phone, a personal digital assistant (PDA) called a personal digital assistant, Industrial PDAs are typical.
  • PDA personal digital assistant
  • Industrial PDAs are typical.
  • MIMO multi-input multi-output system
  • Such a multiple input / output (MIMO) system uses multiple antennas for transmission and reception, enabling high-speed data transmission without further increasing the frequency allocation used by the entire system, thereby efficiently using limited frequency resources. Because of this, it is widely used.
  • isolation and correlation coefficient (Evelope Correlation Coefficient, ECC) between each antenna must be sufficiently secured for efficient communication.
  • ECC Erlope Correlation Coefficient
  • MIMO multiple input / output
  • the problem to be solved by the present invention is to provide a mobile terminal having an antenna system that can be installed in a narrow installation space and has characteristics of much higher isolation and low correlation coefficient than in the prior art.
  • the conductive unit is provided with a conductive material and provided with a first loop forming through hole formed therethrough; And a plurality of first antenna units connected to the conductor unit and positioned adjacent to the first loop-forming through hole and spaced apart from each other, and configured to transmit or receive a signal.
  • a non-conductive material may be disposed in the first loop-forming through hole.
  • It may further include a first power supply terminal unit connected to the conductor unit and disposed adjacent to the first antenna unit.
  • the first power supply terminal unit may be provided on at least one of the upper wall, the lower wall and the side wall of the conductor unit.
  • the first power supply terminal portion may protrude from a side wall of the first loop-forming through hole.
  • the first loop forming through hole may be provided in any one of a polygonal shape, a circle, and an ellipse shape.
  • the electronic device may further include a first power supply unit electrically connected to the first power supply terminal and configured to feed the first antenna unit.
  • the conductor unit may be a printed circuit board (PCB) or a flexible printed circuit board (FPCB).
  • PCB printed circuit board
  • FPCB flexible printed circuit board
  • the conductor unit may be an outer frame.
  • the plurality of first antenna units are provided in a pair, wherein the first antenna unit is coupled to the conductor unit, the vertical body portion protruding from the surface of the conductor unit in the conductor unit; And a horizontal body portion having one end intersecting the vertical body portion and connected to the vertical body portion, the other end forming a free end portion.
  • the pair of first antenna units may be spaced apart at a predetermined spacing interval, and the pair of first antenna units may be arranged symmetrically with respect to the center point of the spacing interval.
  • a plurality of second antenna units disposed adjacent to the second loop forming through holes and spaced apart from the first loop forming through holes and disposed to be spaced apart from each other and connected to the conductor unit;
  • a second power supply terminal unit connected to the conductor unit and disposed adjacent to the second antenna unit;
  • a second power supply unit electrically connected to the second power supply terminal and configured to feed the second antenna unit.
  • Embodiments of the present invention provided with a conductive material is provided with a conductor unit is provided with a first through-hole formed through the loop, and a plurality of first antenna unit disposed adjacent to the first loop-forming through-hole is disposed apart from each other
  • MIMO multiple input / output
  • FIG. 1 is a diagram illustrating a mobile terminal according to a first embodiment of the present invention.
  • FIG. 2 is a diagram illustrating a part of the mobile terminal of FIG. 1.
  • FIG. 3 is a graph illustrating an isolation of the first antenna unit of FIG. 2.
  • FIG. 4 is a graph illustrating a correlation coefficient of the first antenna unit of FIG. 2.
  • FIG. 5 is a diagram illustrating a portion of a mobile terminal according to a second embodiment of the present invention.
  • FIG. 6 is a graph illustrating an isolation of the antenna unit of FIG. 5.
  • FIG. 7 is a diagram illustrating a portion of a mobile terminal according to a third embodiment of the present invention.
  • FIG. 8 is a diagram illustrating a portion of a mobile terminal according to a fourth embodiment of the present invention.
  • FIG. 9 is a diagram illustrating a portion of a mobile terminal according to a fifth embodiment of the present invention.
  • FIG. 10 is a diagram illustrating a mobile terminal according to a sixth embodiment of the present invention.
  • a mobile terminal is a terminal that can wirelessly communicate voice or video data while moving anywhere, and is a mobile communication terminal such as a mobile phone, a personal digital assistant (PDA) called a personal digital assistant, and an industrial PDA. It includes, but will be described below when the industrial PDA is used in a mobile terminal.
  • PDA personal digital assistant
  • FIG. 1 is a view showing a mobile terminal according to a first embodiment of the present invention
  • Figure 2 is a view showing a part of the mobile terminal of Figure 1
  • the mobile terminal includes an outer frame 10 and an antenna device 100 disposed inside the outer frame 10 and performing wireless communication. .
  • An input keypad 20 is provided on the outer frame 10, and a display 30 is provided above the keypad 20.
  • the antenna device 100 is disposed inside the outer frame 10 and performs wireless communication.
  • the antenna device 100 performs a function of a multiple input / output (MIMO) antenna.
  • the antenna device 100 according to the present embodiment aims to increase isolation and lower correlation coefficient (ECC) while performing a function of a multiple input / output (MIMO) antenna, which will be described in detail below.
  • the isolation and correlation coefficients used in the antenna field are related to each other. The higher the isolation, the lower the correlation coefficient.
  • the antenna device 100 is made of a conductive material and is connected to the conductor unit 110 and the conductor unit 110 having the first loop-forming through hole 111.
  • a plurality of first antenna units 120 positioned adjacent to the loop forming through-holes 111 and spaced apart from each other, and first connected to the conductor units 110 and disposed adjacent to the first antenna units 120.
  • the conductor unit 110 is made of a conductive material.
  • the conductor unit 110 may be a printed circuit board (PCB), a flexible printed circuit board (FLPCEIBLE PRINTED CIRCUIT BOARD, FPCB) or a metal frame.
  • the first loop forming through hole 111 is formed through.
  • the first loop forming through hole 111 is provided as a rectangular long hole, as shown in detail in FIG. 2. However, the scope of the present invention is not limited thereto, and the first loop forming through hole 111 may have various shapes.
  • the first loop forming through hole 111 serves to form a non-conductive region in a portion of the conductor unit 110 formed of a conductive material. Therefore, a loop through which current flows on the conductor unit 110 is formed by the first loop forming through hole 111. That is, a loop through which current flows along the circumference (side wall) of the first loop forming through hole 111 is formed.
  • a nonconductive material may be disposed in the first loop forming through hole 111.
  • a speaker module (not shown), a camera module (not shown), an earphone jack module (not shown), and the like, which are made of a non-conductive material, may be disposed in the first loop forming through hole 111.
  • the size, width, and length of the first loop forming through hole 111 may be determined by isolation and correlation coefficient (ECC) between the first antenna units 120.
  • ECC isolation and correlation coefficient
  • Isolation and correlation coefficient (ECC) between the first antenna units 120 are affected by various factors, including the size, width, and length of the first loop forming through hole 111. It is also affected by the distance between the first antenna unit 120. That is, the size, width, length, etc. of the first loop forming through hole 111 may be adjusted by the distance between the first antenna units 120.
  • the first loop forming through hole 111 may be provided in a shape having an area larger than that of the first antenna unit 120 projected onto the conductor unit 110. Can be.
  • the first antenna unit 120 is connected to the conductor unit 110.
  • the first antenna unit 120 is made of a conductive material, and transmits and receives an electromagnetic plate signal.
  • the first antenna units 120 are provided in pairs and spaced apart from each other (the first antenna units 120 provided in pairs are referred to as 2 by 2 types).
  • the first antenna unit 120 includes a vertical body portion 121 coupled to the conductor unit 110 and protruding from the conductor unit 110, and one end of the vertical antenna portion ( It is connected to 121 and includes a horizontal body portion 122 that the other end forms a free end.
  • the vertical body portion 121 is coupled to the conductor unit 110.
  • the vertical body portion 121 is provided to protrude upward from the surface in the conductor unit 110.
  • the side wall of the vertical body portion 121 is disposed on the same plane as at least a portion of the side wall of the first loop forming through hole 111, as shown in detail in FIG.
  • the other end of the horizontal body portion 122 forms a free end.
  • the pair of first antenna units 120 are spaced apart by a predetermined spacing interval, as shown in detail in FIG. 2.
  • This spacing is affected by the size, width, length, etc. of the first loop-forming through hole 111, and increases the isolation when the size, width, length, etc. of the first loop-forming through hole 111 is determined. It may be provided at an optimal interval to lower the correlation coefficient (ECC).
  • the pair of first antenna units 120 are arranged symmetrically with respect to the center point of the separation interval. Therefore, as shown in FIG. 2, the other ends of the horizontal body portions 122 forming the free ends are disposed in opposite directions to minimize interference between the first antenna units 120.
  • the first power supply terminal 130 is connected to the conductor unit (110).
  • the first power supply terminal unit 130 is disposed adjacent to the first antenna unit 120.
  • the first power supply terminal unit 130 may be provided on at least one of the upper wall, the lower wall, and the side wall of the conductor unit 110. That is, the first antenna unit 120 may be fed in such a manner that the first feeding unit (not shown) is directly connected to the surface of the conductive unit 110 of a conductive (metal) material.
  • first power supply terminal unit 130 may be provided to protrude from the sidewall of the first loop forming through hole 111, as shown in detail in FIG.
  • the first power supply unit (not shown) is electrically connected to the first power supply terminal unit 130.
  • the first power supply unit (not shown) feeds the first antenna unit 120.
  • the first power supply unit (not shown) supplies energy to the first antenna unit 120, and the first antenna unit 120 received energy from the first power supply unit (not shown) is intended to resonate. Transmit the electromagnetic wave signal of the band.
  • the first antenna unit 120 may receive an external electromagnetic wave signal.
  • the first antenna unit 120 transmits an electromagnetic wave signal for convenience of description.
  • Electromagnetic wave signals radiated from one of the first antenna unit 120 of the pair of first antenna unit 120 spaced apart from each other may propagate to the other first antenna unit 120 to interfere with The interference of the first antenna unit 120 is minimized by the first loop forming through hole 111 formed in the conductor unit 110 and disposed adjacent to the first antenna unit 120 as in the present embodiment.
  • S11 and S22 are return losses, that is, reflection losses of each of the first antenna units 120
  • S12 and S21 are transmission losses, that is, isolation between the pair of first antenna units 120.
  • the transmission loss between the first antenna units 120 is approximately -28 dB at 2.45 GHz.
  • the MIMO antenna is very good for the mobile terminal of the present embodiment.
  • the system can be configured.
  • the first antenna unit 120 has a low coefficient of correlation (ECC) value formed by the first loop forming through hole 111 formed in the conductor unit 110 and disposed adjacent to the first antenna unit 120.
  • ECC coefficient of correlation
  • Has 4 shows a correlation coefficient (ECC) between the first antenna units 120 of the present embodiment.
  • the correlation coefficient (ECC) of the first antenna units 120 of the present embodiment is 2.4 GHz. To a value that converges to almost zero in the 2.5 GHz band.
  • the first power supply unit (not shown) supplies energy of the 2.4 GHz to 2.5 GHz band, which is the WLAN band, to the first antenna unit 120.
  • the first antenna unit 120 that receives energy from the first power supply unit (not shown) radiates electromagnetic waves of a band to be resonated.
  • electromagnetic waves radiated from one of the first antenna units 120 of the pair of first antenna units 120 spaced apart from each other may propagate to the other first antenna unit 120 to cause interference.
  • the interference between the first antenna unit 120 is formed by the first loop forming through hole 111 formed in the conductor unit 110 and disposed adjacent to the first antenna unit 120 as in the present embodiment. Is minimized.
  • the isolation of the first antenna unit 120 is increased and the first antenna unit 120 is formed by the first loop forming through hole 111 formed in the conductor unit 110 and disposed adjacent to the first antenna unit 120.
  • the mobile terminal according to the present embodiment is provided with a conductive material and is disposed adjacent to the conductor unit 110 having the first loop forming through hole 111 and the first loop forming through hole 111.
  • a multiple input and output (MIMO) antenna system that can be installed in a narrow installation space and has the characteristics of high isolation and low correlation coefficient.
  • FIG. 5 is a view showing a portion of a mobile terminal according to a second embodiment of the present invention
  • Figure 6 is a graph showing an isolation diagram of the antenna unit of FIG.
  • the present embodiment further includes a second loop-forming through hole 112, second antenna units 120c and 120d, a terminal part 140 for second feeding and a second feeding unit (not shown).
  • the mobile terminal is disposed adjacent to the second loop forming through hole 112 provided at a position spaced apart from the first loop forming through hole 111 and spaced apart from each other.
  • the plurality of second antenna units 120c and 120d connected to the conductor unit 110 and the second power supply terminal unit 140 connected to the conductor unit 110 and disposed adjacent to the second antenna units 120c and 120d.
  • a second power supply unit (not shown) electrically connected to the second power supply terminal unit 140 and powering the second antenna units 120c and 120d.
  • the conductor unit 110 has a second loop forming through hole 112 formed therethrough.
  • a non-conductive material may be disposed in the second loop forming through hole 112.
  • the second antenna units 120c and 120d are provided in two pairs and spaced apart from each other (in this case, a pair of first antenna units 120a and 120b and a pair of second antenna units 120c and 120d are configured). Is called 4 by 4 type).
  • the antenna units 120a, 120b, 120c, and 120d have a high degree of isolation.
  • S11, S22, S33, and S44 represent a return loss, that is, a return loss of each of the antenna units 120a, 120b, 120c, and 120d.
  • S21, S34 and S43 are transmission losses (isolated degrees) of each pair (i.e., between the first antenna units 120a and 120b and between the second antenna units 120c and 120d), and
  • S13, S31 and S24 and S42 are Transfer loss (isolation) between different pairs (ie, between 120a and 120c and between 120b and 120d).
  • the transmission loss (isolation degree) between each pair of antenna units 120a and 120b and between 120c and 120d at 2.45 GHz shows a very good isolation characteristic of approximately -37 dB.
  • the transmission loss (isolation degree) between different pairs of antenna units 120a and 120c and between 120b and 120d is also approximately -16 dB, showing good isolation characteristics.
  • the mobile terminal according to the present embodiment includes a first loop forming through hole provided in the conductor unit 110 and disposed adjacent to each of the first antenna units 120a and 120b and the second antenna units 120c and 120d.
  • 111 and the second loop forming through-hole 112 increases the isolation between the antenna units 120a, 120b, 120c, and 120d and the number of antenna units 120a, 120b, 120c, and 120d, while increasing the number of antenna units 120a, 120b, 120c, and 120d. There is an advantage to this.
  • FIG. 7 is a diagram illustrating a portion of a mobile terminal according to a third embodiment of the present invention.
  • This embodiment has a difference in shape of the first loop-forming through hole 211 as compared with the first embodiment, and in other configurations is the same as that of the first embodiment of FIGS. The description is omitted about the configuration.
  • the first loop forming through hole 211 of the present embodiment is provided in a polygonal shape, as shown in FIG. 7.
  • the mobile terminal according to the present embodiment includes a first loop-forming through hole 211 provided in the conductor unit 210 and disposed adjacent to the first antenna units 120, thereby installing in a narrow installation space. It is possible to allow the first antenna unit 120 to have a high degree of isolation.
  • FIG. 8 is a diagram illustrating a portion of a mobile terminal according to a fourth embodiment of the present invention.
  • This embodiment has a difference in shape of the first loop-forming through hole 411 in comparison with the first embodiment, and in other configurations is the same as that of the first embodiment of FIGS. The description is omitted about the configuration.
  • the first loop forming through hole 411 of the present embodiment is provided in an elliptic shape.
  • the mobile terminal according to the present exemplary embodiment includes a first loop forming through hole 411 provided in the conductor unit 410 and disposed adjacent to the first antenna units 120, thereby installing in a narrow installation space. It is possible to allow the first antenna unit 120 to have a much higher isolation than before.
  • FIG. 9 is a diagram illustrating a portion of a mobile terminal according to a fifth embodiment of the present invention.
  • This embodiment has a difference in shape of the first loop-forming through hole 511 as compared with the first embodiment, and in other configurations is the same as that of the first embodiment of FIGS. The description is omitted about the configuration.
  • the first loop forming through hole 511 of the present embodiment is provided in a circular shape.
  • the mobile terminal according to the present exemplary embodiment includes a first loop forming through hole 511 provided in the conductor unit 510 and disposed adjacent to the first antenna units 120, thereby installing in a narrow installation space. It is possible to allow the first antenna unit 120 to have a much higher isolation than before.
  • FIG. 10 is a diagram illustrating a portion of a mobile terminal according to a sixth embodiment of the present invention.
  • This embodiment differs from the point that the conductor unit 610 is the outer frame 610 in comparison with the first embodiment, and in other configurations is the same as the configuration of the first embodiment of Figs. In the description of the same configuration is omitted.
  • the conductor unit 610 is composed of an outer frame 610.
  • the outer frame 610 is provided with a conductive metal material, and the outer frame 610 is formed with a hole 611 through which the side key 40 penetrates.
  • the hole 611 formed in the outer frame 610 serves as the first loop forming through hole 611.
  • An antenna unit (not shown) can be used as a multiple input / output (MIMO) antenna having high isolation and low correlation coefficient.
  • the mobile terminal according to the present embodiment is adjacent to the first loop forming through hole 611 by using the hole 611 provided in the outer frame 610 made of a conductive material as the first loop forming through hole 611.
  • first antenna units not shown
  • MIMO multiple input / output
  • the present invention relates to a mobile terminal, and more particularly, to a mobile terminal that can be used in the mobile communication industry, such as a mobile phone, and the industrial personal digital assistant (PDA) industry.
  • a mobile terminal that can be used in the mobile communication industry, such as a mobile phone, and the industrial personal digital assistant (PDA) industry.
  • PDA personal digital assistant

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  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Details Of Aerials (AREA)
  • Telephone Set Structure (AREA)

Abstract

L'invention concerne un terminal mobile. Le terminal mobile, selon la présente invention, comprend : une unité de conducteur constituée d'un matériau conducteur et dans lequel est formé un premier trou traversant à formation de boucle ; et une pluralité de premières unités d'antenne qui émettent ou reçoivent des signaux, la pluralité de premières unités d'antenne étant connectées à l'unité de conducteur, étant positionnées de façon adjacente au premier trou traversant à formation de boucle et étant espacées les unes des autres.
PCT/KR2018/004300 2017-04-14 2018-04-12 Terminal mobile WO2018190655A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR10-2017-0048494 2017-04-14
KR1020170048494A KR102027333B1 (ko) 2017-04-14 2017-04-14 모바일 단말기

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Publication Number Publication Date
WO2018190655A1 true WO2018190655A1 (fr) 2018-10-18

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PCT/KR2018/004300 WO2018190655A1 (fr) 2017-04-14 2018-04-12 Terminal mobile

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KR (1) KR102027333B1 (fr)
WO (1) WO2018190655A1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080094302A1 (en) * 2006-10-20 2008-04-24 Hong Kong Applied Science And Technology Research Institute Co., Ltd. Systems and methods using ground plane filters for device isolation
KR100910526B1 (ko) * 2007-11-20 2009-07-31 삼성전기주식회사 안테나 및 이를 이용한 이동통신 단말기
KR20130052988A (ko) * 2011-11-14 2013-05-23 삼성전자주식회사 신호 발생 소자를 격리시키는 전자 장치
KR20140037687A (ko) * 2012-09-19 2014-03-27 엘지전자 주식회사 이동 단말기
KR20160061770A (ko) * 2014-11-24 2016-06-01 엘에스엠트론 주식회사 차량 내장형 안테나 모듈

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR101620378B1 (ko) 2014-09-19 2016-05-13 주식회사 에이스테크놀로지 Ｅｃｃ의 개선을 위한 무선단말기용 ｍｉｍｏ안테나시스템

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20080094302A1 (en) * 2006-10-20 2008-04-24 Hong Kong Applied Science And Technology Research Institute Co., Ltd. Systems and methods using ground plane filters for device isolation
KR100910526B1 (ko) * 2007-11-20 2009-07-31 삼성전기주식회사 안테나 및 이를 이용한 이동통신 단말기
KR20130052988A (ko) * 2011-11-14 2013-05-23 삼성전자주식회사 신호 발생 소자를 격리시키는 전자 장치
KR20140037687A (ko) * 2012-09-19 2014-03-27 엘지전자 주식회사 이동 단말기
KR20160061770A (ko) * 2014-11-24 2016-06-01 엘에스엠트론 주식회사 차량 내장형 안테나 모듈

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KR20180115949A (ko) 2018-10-24

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