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`a2) United States Patent
`US 9,496,082 B2
`(0) Patent No.:
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`Nov.15, 2016
`(45) Date of Patent:
`Parket al.
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`US009496082B2
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`(54) COIL SUBSTRATE FOR WIRELESS
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`CHARGING AND ELECTRIC DEVICE USING
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`THE SAME
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`(71) Applicant: SAMSUNG
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`ELECTRO-MECHANICS CO., LTD.,
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`Suwon (KR)
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`(72)
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`Inventors: No Il Park, Suwon (KR); Chang Ryul
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`Jung, Suwon (KR); Hak Kwan Kim,
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`Suwon (KR); Sung Yong An, Suwon
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`(KR)
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`(73) Assignee: SAMSUNG
`ELECTRO-MECHANICS CO., LTD.,
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`Suwon-Si, Gyeonggi-Do (KR)
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`(*) Notice:
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`Subject to any disclaimer, the term ofthis
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`patent is extended or adjusted under 35
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`U.S.C. 154(b) by 263 days.
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`(21) Appl. No.: 13/888,692
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`May7, 2013
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`(22)
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`Filed:
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`Prior Publication Data
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`US 2014/0266030 Al
`Sep. 18, 2014
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`(65)
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`(30)
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`Foreign Application Priority Data
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`(KR) veseeessseessesseen 10-2013-0026143
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`Mar. 12, 2013
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`(51)
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`(2006.01)
`(2006.01)
`(2006.01)
`(2016.01)
`(2006.01)
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`Int. Cl.
`HOIF 38/14
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`HOIF 2734
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`HOIF 2736
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`H02J 5/00
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`HOIF 27/28
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`(52) U.S. Cl
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`CPC veseeeecseeen HOIF 38/14 (2013.01); HOIF 27/34
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`(2013.01); HOIF 27/362 (2013.01); HO27
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`5/005 (2013.01); HOLF 27/2804 (2013.01);
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`HOIF 27/2871 (2013.01)
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`(58) Field of Classification Search
`CPC ciicceccccsescssenseseecseseneescnesesssanecneneees HOF 38/14
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`USPC wiecesssesctesseseseseecssseecsnecensensseseeansentes 320/108
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`See application file for complete search history.
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`References Cited
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`U.S. PATENT DOCUMENTS
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`(56)
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`5,898,403 A *
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`6,906,411 BL*
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`8,125,401 B2*
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`2009/0096694 Al*
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`2011/0198940 Al*
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`2012/0274148 AL*
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`2012/0293120 AL*
`2013/0009488 Al*
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`2014/0210406 AL*
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`4/1999 Saitoh wu. HO1Q 1/38
`333/185
`6/2005 Katsura et al. ou... 257/700
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`2/2012 Ito wo G06K 19/07749
`343/787
`4/2009 Ito etal. wo. 343/788
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`8/2011 Urano ou. HOIF 38/14
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`307/104
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`11/2012 Sung oe. HO4B 5/0037
`307/104
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`11/2012 Jang wo... HO1Q 1/2225
`320/108
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`1/2013 Choe uc HO02J 5/005
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`307/104
`7/2014 Na wae HO02J 7/025
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`320/108
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`FOREIGN PATENT DOCUMENTS
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`12/2010
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`10-2010-0130480
`KR
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`* cited by examiner
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`Primary Examiner — Samuel Berhanu
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`Assistant Examiner — Tessema Kebede
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`(74) Attorney, Agent, or Firm — McDermott Will &
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`Emery LLP
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`ABSTRACT
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`There are provided a coil substrate which includes a coil for
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`wireless charging and an antenna andis capable of increas-
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`ing charging efficiency, and an electronic device including
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`the same. The coil substrate according to embodiments of
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`the invention may include a coil pattern; a dummy part
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`formed around the coil pattern; and at least one penetration
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`part formed in the dummypart or in a central portion of the
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`coil pattern.
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`(57)
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`9 Claims, 5 Drawing Sheets
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`Page | of 11
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`SAMSUNG EXHIBIT 1018
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`Page 1 of 11
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`SAMSUNG EXHIBIT 1018
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`U.S. Patent
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`Nov. 15, 2016
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`Sheet 1 of 5
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`US 9,496,082 B2
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`FIG.
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`1
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`U.S. Patent
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`Nov.15, 2016
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`Sheet 2 of 5
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`US 9,496,082 B2
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`120 >
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`>100
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`a
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`FIG. 3
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`U.S. Patent
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`Nov. 15, 2016
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`Sheet 3 of 5
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`US 9,496,082 B2
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`110
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`U.S. Patent
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`Nov. 15, 2016
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`Sheet 4 of 5
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`US 9,496,082 B2
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`Page 5 of 11
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`Page 5 of 11
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`U.S. Patent
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`Nov. 15, 2016
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`Sheet 5 of 5
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`US 9,496,082 B2
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`Page 6 of 11
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`US 9,496,082 B2
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`1
`COIL SUBSTRATE FOR WIRELESS
`
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`CHARGING AND ELECTRIC DEVICE USING
`
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`THE SAME
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`CROSS-REFERENCE TO RELATED
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`APPLICATIONS
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`2
`RELATED ART DOCUMENT
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`(Patent Document 1) Korean Patent Laid-open Publication
`No. 2010-0130480
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`SUMMARY OF THE INVENTION
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`This application claims the priority of Korean Patent
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`Application No. 10-2013-0026143 filed on Mar. 12, 2013, in
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`the Korean Intellectual Property Office, the disclosure of
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`which is incorporated herein by reference.
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`BACKGROUND OF THE INVENTION
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`1. Field of the Invention
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`The present
`invention relates to a coil substrate for
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`wireless charging and an electronic device including the
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`same and, more particularly, to a coil substrate for wireless
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`charging, which includes a coil for wireless charging and an
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`antenna andis capable of improving charging efficiency, and
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`an electronic device including the same.
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`2. Description of the Related Art
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`In general, a portable electronic device such as a mobile
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`communications
`terminal,
`a personal digital
`assistant
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`(PDA), or the like,
`is provided with a secondary cell
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`rechargeable battery.
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`In order to charge the battery, a separate charging device
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`providing electrical energy to the battery of the portable
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`electronic device using commercially available electrical
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`power is required.
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`Typically, the charging device and the battery include
`dedicated contact terminals formed on external surfaces
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`thereof, respectively, such that the charging device and the
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`battery are electrically connected to each other through
`contact between the contact terminals.
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`However, when the contact terminals as described above
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`are protrudedto external surfaces, the contact terminals spoil
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`the aesthetic appearance of the devices and may be con-
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`taminated with external foreign objects, such that a contact
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`state therebetween maybe easily degraded. In addition, in
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`the case in which the battery is short-circuited or exposed to
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`moisture due to a user’s inadvertent mistake, charged energy
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`may easily be lost.
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`As an alternative to the above-mentioned contact type
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`charging scheme, a wireless charging scheme has been
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`proposed in which the battery is charged in a manner in
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`which poweris wirelessly transmitted without the necessity
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`for the contact terminals of the charging device and the
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`battery to be in contact with each other.
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`In general, wireless charging means that poweris trans-
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`mitted wirelessly to a portable electronic device having a
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`battery using a wireless charging device.
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`The wireless charging device and the portable electronic
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`device transmit/receive power using electromagnetic induc-
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`tion. To this end, each of the wireless charging device and
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`the portable electronic device is provided with a coil for
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`wireless charging.
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`Asthe functions that portable electronic devices provide
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`are multiplied, coils for wireless charging and various forms
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`of antennas are complexly disposed. Further, due to recent
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`trends for the manufacturing of ultra-thin electronic devices,
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`coils for wireless charging and antennas may be disposed in
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`close proximity. As a consequence,
`interference therebe-
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`tween may occur, thereby degrading charging efficiency.
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`Page 7 of 11
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`An aspect of the present invention provides a coil sub-
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`strate for wireless charging in which a coil for wireless
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`charging and an antenna are formed together, and an elec-
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`tronic device including the same.
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`Another aspect of the present invention also provides a
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`coil substrate for wireless charging in which interference
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`between a coil for wireless charging and an antenna formed
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`together therein is minimized, and an electronic device
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`including the same.
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`Another aspect of the present invention also provides a
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`coil substrate for wireless charging which is capable of
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`improving charging efficiency by effectively forming the
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`flow of magnetic flux generated in a device, and an elec-
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`tronic device including the same.
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`According to an aspect of the present invention, there is
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`provided a coil substrate for wireless charging including: a
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`coil pattern; a dummy part formed around the coil pattern;
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`and at least one penetration part formed in the dummypart
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`or in a central portion of the coil pattern.
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`The coil substrate may further include an antenna formed
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`inwardly of or outwardly of the coil pattern.
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`The dummypart may be formed betweenthe coil pattern
`and the antenna.
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`The coil substrate may further include a circuit part
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`formed on one side of the coil pattern to be electrically
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`connected to the coil pattern.
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`The coil substrate may further include a ground pattern
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`formed on the dummy part.
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`The antenna may be used for near field communications.
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`According to another aspect of the present invention,
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`there is provided a coil substrate for wireless charging,
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`including: at least one coil pattern, at least one antenna
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`spaced apart from the coil pattern, and at least one penetra-
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`tion part disposed between the coil pattern and the antenna.
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`The coil substrate may further include a ground pattern
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`between the coil pattern and the antenna, and the penetration
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`part may be formed within the groundpattern.
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`According to another aspect of the present invention,
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`there is provided an electronic device,
`including: a coil
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`substrate for wireless charging including at least one coil
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`pattern and at
`least one antenna; and a magnetic part
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`attached to a surface of the coil substrate, wherein the coil
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`substrate has at least one penetration part formed between
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`the coil pattern and the antenna.
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`The coil substrate may have a dummy part formed
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`between the coil pattern and the antenna, and the penetration
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`part may be formed in the dummypart.
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`The penetration part may be further formed in a central
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`portion of the coil pattern.
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`The coil substrate may have a ground pattern formed
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`between the coil pattern and the antenna, and the penetration
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`part may be formed within the groundpattern.
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`The electronic device may further include an adhesion
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`interposed between the magnetic part and the coil
`part
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`substrate to bond the magnetic part to the coil substrate.
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`The electronic device may further include a voltage
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`converter converting alternating current (AC) power sup-
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`plied from the outside into AC voltage having a specific
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`frequency to provide the converted AC voltage to the coil
`substrate.
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`BRIEF DESCRIPTION OF THE DRAWINGS
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`The above and other aspects, features and other advan-
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`tages of the present invention will be more clearly under-
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`stood from the following detailed description taken in con-
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`junction with the accompanying drawings, in which:
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`FIG. 1 is a perspective view schematically showing an
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`electronic device and a wireless charging device according
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`to an embodimentof the present invention;
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`FIG.2 is a cross-sectional view taken along line A-A' of
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`FIG. 1,
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`FIG. 3 is an exploded perspective view schematically
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`showing a contactless power receiver according to an
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`embodimentof the present invention;
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`FIG. 4 is a plan view schematically showing a coil
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`substrate shown in FIG.3;
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`FIG. 5 is a plan view schematically showing a coil
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`substrate according to another embodiment of the present
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`invention;
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`FIG.6 is a cross-sectional view taken along line B-B' of
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`FIG. 5; and
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`FIG. 7 is a plan view schematically showing a coil
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`substrate according to another embodiment of the present
`invention.
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`DETAILED DESCRIPTION OF THE
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`EMBODIMENTS
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`Hereinafter, embodiments of the present invention will be
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`described in detail with reference to the accompanying
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`drawings. The invention may, however, be embodied in
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`many different forms and should not be construed as being
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`limited to the embodiments set forth herein. Rather, these
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`embodiments are provided so that this disclosure will be
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`thorough and complete, and will fully convey the scope of
`the invention to those skilled in the art.
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`In the drawings, the shapes and dimensions of elements
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`may be exaggerated for clarity, and the same reference
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`numerals will be used throughout to designate the same or
`like elements.
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`FIG. 1 is a perspective view schematically showing an
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`electronic device and a wireless charging device according
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`to an embodimentof the present invention; and FIG. 2 is a
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`cross-sectional view taken along line A-A' of FIG.1.
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`Referring to FIGS. 1 and 2, an electronic device 10
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`according to the present embodiment may include a battery
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`12 and a contactless power receiver 100 supplying powerto
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`the battery 12 so as to charge the battery 12.
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`The battery 12 may be a secondary battery capable of
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`being charged and discharged, and may be fixed to or
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`separated from the electronic device 10.
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`The contactless power receiver 100 may be housed in a
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`case 11 of the electronic device 10 to be directly attached to
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`or to be disposed as closely as possible to an inner surface
`of the case 11.
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`In addition, a wireless charging device 20 accordingto the
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`present embodiment
`is provided in order to charge the
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`battery 12 of the electronic device 10. To this end,
`the
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`wireless charging device 20 may include a contactless power
`transmitter 200 in a case 21 thereof.
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`The wireless charging device 20 may convert externally
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`supplied commercially available alternating current (AC)
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`powerinto direct current (DC) power and then converts the
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`Page 8 of 11
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`US 9,496,082 B2
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`DC power into an AC voltage having a predetermined
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`frequency to thereby provide the AC voltage to the contact-
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`less power transmitter 200. To this end, the wireless charg-
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`ing device 20 may include a voltage converter 22 converting
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`the commercially available AC power into the AC voltage
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`having a predetermined frequency.
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`When the AC voltage is applied to a coil of the contactless
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`powertransmitter 200, a magnetic field in the vicinity of the
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`coil changes. Then, the voltage induced by changing the
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`magnetic field is applied to the contactless power receiver
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`100 in the electronic device 10, adjacent to the contactless
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`powertransmitter 200, such that the battery 12 is charged.
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`Hereinafter, the contactless power receiver 100 included
`in the electronic device 10 will be described in detail.
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`FIG. 3 is an exploded perspective view schematically
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`showing a contactless power receiver according to an
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`embodiment of the present invention; and FIG.4 is a plan
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`view schematically showing a coil substrate shown in FIG.
`3.
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`Referring to FIGS. 3 and 4,the contactless powerreceiver
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`100 includes a coil substrate 110 and a magnetic part 120.
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`The magnetic part 120 has a flat plate shape (or a sheet
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`shape), is disposed on one surface of the coil substrate 110,
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`and is fixedly attached to the coil substrate 110. The mag-
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`netic part 120 is provided in order to efficiently form a
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`magnetic path for a magnetic field generated by a coil
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`pattern 115. To this end, the magnetic part 120 may be made
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`of a material which may easily form the magnetic path, and
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`mayinclude a shielding sheet having the permeability of a
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`ferrite sheet, for example.
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`However, the magnetic part 120 according to the present
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`embodimentis not limited to the above-mentioned configu-
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`ration but may bevaried. For example, the magnetic part 120
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`may be formed by applying ferrite powder or magnetic
`solution to a surface of the coil substrate 110.
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`In addition, the magnetic part 120 accordingto the present
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`embodiment may be used as a shielding sheet for shielding
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`electromagnetic waves or a leaked magnetic flux. In this
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`case, as the magnetic part 120, a shielding sheet having a
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`high level of permeability, such as a metal composite sheet
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`and an amorphous sheet, may be used. However, the inven-
`tion is not limited thereto.
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`For example, instead of using a shielding sheet as the
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`magnetic part 120, an additional shielding sheet may be
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`provided on an outer surface of the magnetic part 120.
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`Further, the magnetic part 120 may be providedasa plurality
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`of sheets, rather than a single sheet. That is, the magnetic
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`part 120 may be formed bystacking a ferrite sheet and a
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`shielding sheet.
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`In addition, the contactless power receiver 100 according
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`to the present embodiment may include an adhesion part 140
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`interposed between the coil substrate 110 and the magnetic
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`part 120 so that the coil substrate 110 and the magnetic part
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`120 are firmly and fixedly adhered to each other.
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`The adhesion part 140 is disposed between the coil
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`substrate 110 and the magnetic part 120 such that
`the
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`magnetic part 120 adheres to the coil substrate 110. The
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`adhesion part 140 may be formed of an adhesive sheet or an
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`adhesive tape, or may be formed by applying an adhesive or
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`a resin having adhesive properties to a surface of the coil
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`substrate 110 or the magnetic part 120. Here, the adhesion
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`part 140 may contain a ferrite powder so that it may have
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`magnetism together with the magnetic part.
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`The coil substrate 110 may be an insulating substrate such
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`as a printed circuit board (PCB), a ceramic substrate, a
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`pre-molded substrate or a direct bonded copper (DBC)
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`substrate, or may be an insulated metal substrate (IMS).
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`Page 8 of 11
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`5
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`Advantageously, a flexible PCB which is thin and has a
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`wiring pattern formed thereon, such as a film-type or a
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`thin-type printed circuit board may be used as the coil
`substrate 110.
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`The coil substrate 110 may include the coil pattern 115, a
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`circuit part 117, an antenna 112 and a dummypart 118, as
`shown in FIGS. 3 and 4.
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`The coil pattern 115 may be formedas a wiring pattern on
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`at least one surface of the coil substrate 110. The coil pattern
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`115 according to the present embodiment is provided in a
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`spiral form on one or both surfaces of the coil substrate 110,
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`the ends of which are electrically connected to the circuit
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`part 117.
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`In a case in which the coil patterns 115 are formed on both
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`surfaces of the coil substrate 110, the coil patterns 115 may
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`configure a parallel circuit by which both ends of one coil
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`pattern 115 are electrically connected to both ends of the
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`other coil pattern 115 or may configure a series circuit by
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`which an end of one coil pattern 115 in a central portion
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`thereof is connected to an end of the other coil pattern 115.
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`To this end, a conductive via (not shown) for electrically
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`connecting the coil patterns 115 may be formed in the coil
`substrate 110.
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`In the present embodiment, the coil pattern 115 is formed
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`as a generally rectangular spiral pattern, by way of example;
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`however, the coil pattern 115 is not limited thereto, but may
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`have various shapes. For example, the coil pattern 115 may
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`be formed as a circular spiral pattern, a polygonal spiral
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`pattern, or the like.
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`Further, the coil pattern 115 may include an insulation
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`protecting layer (for example, a resin insulating layer, not
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`shown) formed thereon, as needed, for protecting the coil
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`pattern 115 externally.
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`Thecircuit part 117 may be formedon onesideofthe coil
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`substrate 110 to be electrically connected to the coil pattern
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`115. Further, the circuit part 117 may have a variety of
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`passive or active elements formed thereon, and may also be
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`electrically connectedto the battery 12 of FIG. 2 for storing
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`power to transmit power from the coil pattern 115 to the
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`battery.
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`The antenna 112 may be formed aroundthe coil pattern
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`115. Specifically, the antenna 112 may be formed on edges
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`of the coil substrate 110, and the coil pattern 115 may be
`formed inside the antenna 112.
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`Like the coil pattern 115, the antenna 112 may be formed
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`as a wiring pattern. The antenna 112 according tothe present
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`embodiment may be an antenna used in near field commu-
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`nications (NFC). However,
`the invention is not
`limited
`thereto.
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`Although the antenna 112 is formed outside the coil
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`pattern 115 in the present embodiment, the invention is not
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`limited thereto. That is, the antenna 112 is not limited to the
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`above-mentioned configuration but may have various con-
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`figurations. For example, the antenna 112 may be formed
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`inside the coil pattern 115, or different antennas 112 may be
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`formed inside and outside the coil pattern 115.
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`The dummypart 118 may be formed between the antenna
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`112 and the coil pattern 115. In a case in which the coil
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`pattern 115 for wireless charging and the antenna 112 are
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`formed in close proximity on one coil substrate 110, inter-
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`ference may occur therebetween.
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`Specifically, in a case in which the antenna 112 is used in
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`NFC(the working frequency of 13.56 MHz) and a frequency
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`of 100 kHz is applied to the coil pattern 115 for wireless
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`charging, the antenna 112 for NFC andthe coil pattern 115
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`for wireless charging should have different respective reso-
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`nant frequencies.
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`6
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`However, in the case in which the coil pattern 115 for
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`wireless charging and the antenna 112 are disposed in close
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`proximity, a dual resonance phenomenon may occur, such
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`that passive elements connected to the antenna or the coil
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`circuit may be problematic.
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`Accordingly,
`the coil substrate 110 according to the
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`present embodiment includes the dummypart 118 between
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`the antenna 112 and the coil pattern 115 in order to prevent
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`the above-described problem.
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`The dummypart 118 may have various widths unless it
`causes interference between the antenna 112 and the coil
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`pattern 115. For instance, the width of the dummypart 118
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`may be approximately 5 mm, or approximately 2 mm
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`depending on the material of the coil substrate 110 or various
`environmental conditions.
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`In addition, the coil substrate 110 according to the present
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`embodimentincludes one or more penetration parts 119. The
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`penetration parts 119 may be formed as through holes, and
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`may be located in the dummy part 118 andin a central
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`portion of the coil pattern 115 in which no coil pattern 115
`is formed.
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`Accordingly, the penetration part 119 may be formed to
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`have a size corresponding to the width of the dummy part
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`118 or a size of the central portion of the coil pattern 115.
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`The penetration part 119 serves to provide a path along
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`which the magnetic flux generated by the wireless charging
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`device 20 of FIG. 2 may flow effectively. Without the
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`penetration part 119, the flow of the magnetic flux generated
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`around the coil pattern 115 may be interfered by the coil
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`substrate 110. However, with the penetration part 119
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`according to the present embodiment, the magnetic flux may
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`flow through the penetration part 119 of the coil substrate
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`110, such that charging efficiency is improved.
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`In a portable electronic device according to the above-
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`described embodiment,
`the coil pattern 115 for wireless
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`charging and the antenna 112 for near field communications
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`are formed together in the coil substrate 110. Accordingly,
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`no separate antenna is required, thereby reducing the size of
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`the portable electronic device.
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`In addition, both of the coil pattern 115 and the antenna
`112 are formed on the coil substrate 110 in the form of
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`wiring patterns. Accordingly, the coil pattern 115 and the
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`antenna 112 may be formedin the process of forming circuit
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`patterns on the coil substrate 110, thereby facilitating the
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`manufacturing process.
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`In addition, the coil substrate 110 according to the present
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`embodimentincludes the dummypart 118 betweenthe coil
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`pattern 115 and the antenna 112. Accordingly, interference
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`between the coil pattern 115 for wireless charging and the
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`antenna 112 may beprevented.
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`Further, the coil substrate 110 according to the present
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`embodimenthas one or more hole-like penetration parts 119
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`in the dummypart 118 andin the central portion of the coil
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`pattern 115, thereby facilitating the flow of the magnetic flux
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`to improve charging efficiency.
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`Meanwhile, the coil substrate according to the embodi-
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`mentof the invention andthe electronic device including the
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`same are not limited to the above-described embodiment,
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`but may be variously configured.
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`FIG. 5 is a plan view schematically illustrating a coil
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`substrate according to another embodiment of the present
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`invention, and FIG. 6 is a cross-sectional view of FIG. 5,
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`taken along line B-B'.
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`Referring to FIGS. 5 and 6, the coil substrate 110 accord-
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`ing to this embodiment is configured similarly to the coil
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`Page 9 of 11
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`Page 9 of 11
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`7
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`substrate 110 of FIG. 4 according to the above-described
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`embodiment, except
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`the former further includes a
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`ground pattern 111.
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`Therefore, a detailed description of the same configura-
`tion as that of the above-described embodiment of the
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`invention will be omitted, and the ground pattern 111 will be
`described in detail.
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`The coil substrate 110 according to the present embodi-
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`ment has the ground pattern 111 formed on the dummypart
`118.
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`Like the coil pattern 115 and the antenna 112, the ground
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`pattern 111 may be formed as a wiring pattern. Accordingly,
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`the ground pattern 111 may be formed on the coil substrate
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`110 in the same process along with the coil pattern 115 and
`the antenna 112.
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`The ground pattern 111 may be electrically connected to
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`a ground circuit of the circuit part 117 or a ground wiring.
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`Further, the ground pattern 111 mayserveto fill a space
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`between the antenna 112 and the coil pattern 115. In addi-
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`tion, the penetration parts 119 may be formed within the
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`ground pattern 111.
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`With the ground pattern 111,
`interference between the
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`antenna 112 and the coil pattern 115 may be further mini-
`mized.
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`Further, with the ground pattern 111, a space between the
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`coil substrate 110 and the magnetic part 120 may be mini-
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`mized. In the case of the above-described embodiment, no
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`wiring pattern is formed in the dummypart 118 so that the
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`dummypart 118 is formedto be thinner than the antenna 112
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`or the coil pattern 115 by a thickness of the wiring pattern.
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`Thus, when the magnetic part 120 is stacked on the coil
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`substrate 110, a space corresponding to the thickness of the
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`wiring pattern may be formed between the dummypart 118
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`and the magnetic part 120. Such a space may be a cause of
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`interference of the flow of the magnetic flux.
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`However, in the case in which the groundpattern 111 is
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`formed in the dummypart 118 as in the embodiment shown
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`in FIG. 6, the ground pattern 111 fills the space, thereby
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`eliminating the cause of the interference of the flow of the