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`as) United States
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`a2) Patent Application Publication co) Pub. No.: US 2012/0274148 Al
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` Sunget al. (43) Pub. Date: Nov. 1, 2012
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`US 20120274148A1
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`(54) CONTACTLESS POWER TRANSMISSION
`DEVICE AND ELECTRONIC DEVICE
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`HAVING THE SAME
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`(75)
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`Inventors:
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`Jae Suk Sung, Yongin (KR); Chan
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`Gwang An, Suwon (KR); Dae Ki
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`Lim, Seongnam (KR); Ki Won
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`Chang, Suwon (KR); Hyeon Gil
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`Nam, Suwon (KR); Sang Woo Bae,
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`Suwon (KR); Sung Eun Cho,
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`Suwon (KR); Tae Sung Kim, Seoul
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`(KR); Dae Seong Jeon, Suwon
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`(KR); Chang Mok Han, Cheonan
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`(KR)
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`(30)
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`Foreign Application Priority Data
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`(KR) wetter 10-201 1-0039297
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`(KR) wee 10-201 1-0079697
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`Apr. 27,2011
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`Aug. 10,2011
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`Publication Classification
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`(51)
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`Int. Cl.
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`(2006.01)
`HOIF 38/14
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`(2006.01)
`HO02J 17/00
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`(52) US. CMe coeccccccssssssssssssssssvseseesessessssasisssssenes 307/104
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`(57)
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`ABSTRACT
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`There are provided a contactless power transmission device
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`and an electronic device having the same. The contactless
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`power transmission device includes: a flexible substrate; a
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`coil unit formedin the flexible substrate and including a coil
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`part formed to have a wiring pattern form and having a plu-
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`rality of coil strands connected in parallel with each other to
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`13/286,784
`thereby formasingle coil pattern; and a circuit unit formed in
`(21) Appl. No.:
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`the flexible substrate and electrically connected to the coil
`unit.
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`(73) Assignee:
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`SAMSUNG
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`ELECTRO-MECHANICS CoO.,
`LID.
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`(22)
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`Filed:
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`Nov.1, 2011
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`Page | of 13
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`SAMSUNG EXHIBIT1017
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`SAMSUNG EXHIBIT 1017
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`Patent Application Publication
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`Nov. 1, 2012 Sheet 1 of 5
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`US 2012/0274148 Al
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`FIG.
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`Patent Application Publication
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`Nov. 1, 2012 Sheet 2 of 5
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`US 2012/0274148 Al
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`OO OQ 7|
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`Patent Application Publication
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`Nov. 1, 2012 Sheet 3 of 5
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`US 2012/0274148 Al
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`FIG. 5
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`M8
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`115
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`7
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`4145a 115b
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`112
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`ied Bae ES
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`Bees os |a ea ee
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`Se Ged Kee bas
`a crest_Er. ea Pn Eeeeen Pee
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`Patent Application Publication
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`Nov. 1, 2012 Sheet 4 of 5
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`US 2012/0274148 Al
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`FIG. 7A
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`FIG. 7B
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`Nov. 1, 2012 Sheet 5 of 5
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`US 2012/0274148 Al
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`|—
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`401
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`300'
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`FIG. 8A
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`US 2012/0274148 Al
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`Nov. 1, 2012
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`CONTACTLESS POWER TRANSMISSION
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`DEVICE AND ELECTRONIC DEVICE
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`HAVING THE SAME
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`CROSS-REFERENCE TO RELATED
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`APPLICATIONS
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`[0001] This application claimsthepriority ofKorean Patent
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`Application Nos. 10-2011-0039297filed on Apr. 27, 2011
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`and 10-201 1-0079697filed on Aug. 10, 2011, in the Korean
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`Intellectual Property Office, the disclosures of which are
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`incorporated herein by reference.
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`BACKGROUND OF THE INVENTION
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`1. Field of the Invention
`[0002]
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`[0003] The present invention relates to a contactless power
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`transmission device capable ofwirelessly transmitting power
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`by using electromagnetic induction, and an electronic device
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`having the same.
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`2. Description of the Related Art
`[0004]
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`[0005] Research into a system for wirelessly, that is, con-
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`tactlessly, transmitting powerin order to charge a secondary
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`battery embedded in a portable terminal, or the like, has
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`recently been conducted.
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`[0006] A contactless power transmission device generally
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`includes a contactless power transmitter transmitting power
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`and a contactless power receiver receiving and storing the
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`powertherein.
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`[0007] The contactless power transmission device trans-
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`mits and receives the power by using electromagnetic induc-
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`tion. To this end, each ofthe contactless powertransmitter and
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`contactless powerreceiver includes a coil provided in aninner
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`portion thereof.
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`In particular, a contactless power receiver config-
`[0008]
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`ured of a circuit part and a coil part is attached to a cellular
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`phone case or an additional cradle-shaped accessory struc-
`ture.
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`[0009] Each of the circuit part and the coil part, made of
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`different materials and having different shapes, is attached to
`a case of a mobile communications module such as a case of
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`a cellular phone terminal, or the like, or is mounted therein,
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`and both are connected to each other through a process such
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`as a soldering process for contactless charging.
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`[0010]
`In this case, different kinds of components, each
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`having a substantial thickness, are connected to each other,
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`such that a thicknessofthe cellular phone terminal increases,
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`and a process of connecting the circuit part and the coil part to
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`each other is added, such that a process cost increases and a
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`manufacturing process is complicated.
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`[0011] Meanwhile, according to therelatedart, the coil part
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`of the contactless power transmission device is wound in
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`parallel with a bottom surface (that is, an external contact
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`surface). In addition,the coilis fixed to the bottom surface by
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`an adhesive, an adhesive sheet, or the like.
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`[0012]
`In the case of the contactless power transmission
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`device according to the related art, a coil having a general
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`wire form is used, such that when the coil is wound, it is
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`overlapped and stacked. Therefore, the thickness of the con-
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`tactless power transmission device may be increased due to
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`the thickness of the coil, the amount of turns thereof, and the
`like.
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`in accordance with the recent trend
`[0013] Therefore,
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`towards thin devices, there is a need to develop a contactless
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`powertransmission device having a reduced thickness.
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`Page 7 of 13
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`[0014]
`In addition, in the case of the contactless power
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`transmission device according to the related art, since a coil
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`having the form ofa single line is mainly used, an alternating
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`current (AC) resistance value may increase due to an eddy
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`current, a skin effect, or the like, at a low frequency, such that
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`loss may occur.
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`SUMMARY OF THE INVENTION
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`[0015] An aspect of the present invention provides a con-
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`tactless power transmission device having a reduced thick-
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`ness and an electronic device having the same.
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`[0016] Another aspect of the present invention provides a
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`contactless power transmission device capable of having a
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`minimized thickness by using a thin coil part and an elec-
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`tronic device having the same.
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`[0017] Another aspect of the present invention provides a
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`contactless power transmission device capable of being
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`mounted in an electronic device using a simple method by
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`forming a circuit part and a coil part integrally with each
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`other, and an electronic device having a high degree ofspatial
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`freedom in a case by including an integrally formed and slim
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`contactless power transmission device.
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`[0018] Another aspect of the present invention provides a
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`contactless powertransmission device capable ofminimizing
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`loss generated due to an eddy current, a skin effect, or the like,
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`at a low frequency, and an electronic device having the same.
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`[0019] According to an aspect of the present invention,
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`there is provided a contactless power transmission device
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`including: a flexible substrate; a coil unit formedin theflex-
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`ible substrate and including a coil part formed to have a wiring
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`pattern form and havinga plurality of coil strands connected
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`in parallel with each other to thereby form a single coil pat-
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`tern; and a circuit unit formed in the flexible substrate and
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`electrically connectedto the coil unit.
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`Theflexible substrate maybea film typeorthin type
`[0020]
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`printed circuit board.
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`[0021] The flexible substrate may be a polyimidetypeflex-
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`ible printed circuit board (FPCB)or a frameretardant 4 (FR-
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`4) type printed circuit board.
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`[0022] The coil unit may further include a plate-shaped
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`magnetic part having a magnetic path formed therein and
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`having the coil pattern attached to one surface thereof.
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`[0023] The magnetic part may include a ferrite sheet.
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`[0024] The contactless power transmission device mayfur-
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`ther include an adhesion part interposed between the mag-
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`netic part and the coil part to thereby adhere the magnetic part
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`and the coil part to each other.
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`[0025] The coil part may havethe plurality of coil strands
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`disposed in parallel lines to thereby form the coil pattern.
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`[0026] Thecoil unit may include the coil pattern formed on
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`at least one of both surfaces of the flexible substrate, and the
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`coil pattern may include contact pads formed at both ends
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`thereofso as to be electrically connected to the circuit unit.
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`[0027] The circuit unit may include exposed pads formed
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`therein so as to be electrically connectedto a battery.
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`[0028] The coil part may include the coil strands each
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`formed to have the same shape on the both surfaces of the
`flexible substrate.
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`[0029]
`Theflexible substrate may include conductive vias
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`formed at positions at which ends of the coil strands are
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`disposed, and the coil strands formed on the both surfaces of
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`the flexible substrate may beelectrically connected to each
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`other by the conductive vias.
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`Page 7 of 13
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`US 2012/0274148 Al
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`Nov. 1, 2012
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`electronic device including a contactless powerreceiver and
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`an antenna module according to another embodimentof the
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`present invention.
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`[0030] The coil part may include the coil pattern wound
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`fifteen times on the flexible substrate having a size of 30
`mmx40 mn.
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`[0031] The coil part may includethe coil strands each hav-
`DETAILED DESCRIPTION OF THE PREFERRED
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`ing a width of 0.5 mm or more and a thickness of 36 «um or
`more.
`EMBODIMENT
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`[0032] The coil part may have an inductance of 14 wH or
`[0051] Terms and words used in the specification and
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`more andaresistance of 0.98Q orless, at a frequency of 125
`claims should not be interpreted as being limited to typical
`kHz.
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`meaningsor dictionary definitions, but should be interpreted
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`[0033] According to another aspect of the present inven-
`as having meanings and concepts relevant to the technical
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`tion, there is provided an electronic device including: the
`scope of the present invention based onthe rule according to
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`contactless power transmission device as described above;
`which an inventor can appropriately define the concept ofthe
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`and a case receiving the contactless power transmission
`term to describe most appropriately the best method he or she
`device therein.
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`knowsfor carrying out the invention. Therefore, the configu-
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`[0034] The contactless power transmission device may be
`rations described in the embodiments and drawings of the
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`directly attached to an inner portion of the case or may be
`present invention are merely the most preferable embodi-
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`disposed to be maximally adjacentthereto.
`ments, but do not representall of the technical spirit of the
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`[0035] The contactless power transmission device may be
`present invention. Thus, the present invention should be con-
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`attachedto the inner portion of the case using an adhesive or
`strued as includingall changes, equivalents, and substitutions
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`a double sided tape.
`included inthe spirit and scopeofthe present invention at the
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`include an
`[0036] The electronic device may further
`time ofthefiling of this application.
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`antenna module including an antenna pattern enclosing the
`[0052] Hereinafter, embodiments of the present invention
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`coil pattern of the contactless powertransmission device.
`will be described in detail with reference to the accompanying
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`[0037] The antenna module may beattached to the case,
`drawings. At this time,it is noted that like reference numerals
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`together with the contactless power transmission device.
`denote like elements in appreciating the drawings. Moreover,
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`[0038] The antenna pattern may be an in-mold antenna
`detailed descriptions related to well-known functionsor con-
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`(IMA).
`figurations will be ruled out in order not to unnecessarily
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`obscure the subject matter of the present invention. For the
`[0039] The contactless power transmission device may use
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`same reason, it is to be noted that some components shown in
`a frequency in a 1 kHz to 100 MHzband, and the antenna
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`the drawings are exaggerated, omitted or schematically illus-
`module may use a frequency in a 10 kHz to 5 GHz band.
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`trated, and the size of each componentdoesnot exactly reflect
`[0040] The case may be an outer case frameor a battery
`its actualsize.
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`case frame.
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`[0053] Hereinafter, embodiments of the present invention
`[0041] The electronic device may further includea battery
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`will be described in detail with reference to the accompanying
`storing power generated in the contactless power transmis-
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`sion device.
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`drawings. Meanwhile, in describing the embodiments of the
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`invention, a contactless power transmission device generally
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`includes a contactless power transmitter transmitting power
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`and a contactless power receiver receiving and storing the
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`powertherein.
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`[0054]
`FIG. 11s a perspective view schematically showing
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`an electronic device and a charging device according to an
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`embodimentofthe present invention; and FIG.2 is a cross-
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`sectional view taken along line A-A' of FIG. 1.
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`[0055] Referring to FIGS. 1 and2, an electronic device 10
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`according to the present embodiment mayinclude a battery
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`12 and a contactless powerreceiver 300 supplying powerto
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`the battery 12 to thereby chargethe battery 12.
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`[0056] The battery 12 may be a secondary battery capable
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`of being charged and discharged, and may be attached to and
`detached from the electronic device 10.
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`[0057] The contactless power receiver 300 maybe received
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`ina case 11 ofthe electronic device 10 to thereby be directly
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`attachedto an innersurface ofthe case 11 or be disposedto be
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`maximally adjacent thereto.
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`In addition, a charging device 20 according to the
`[0058]
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`present embodimentis provided in order to chargethe battery
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`12 ofthe electronic device 10. To this end, the charging device
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`20 may include a contactless powertransmitter 100 provided
`ina case 21.
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`[0059] Thecharging device 20 converts householdalternat-
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`ing current (AC) powersupplied from the outside into direct
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`current (DC) powerand again converts the DC powerinto AC
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`voltage having a predetermined frequencyto thereby provide
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`the AC voltage to the contactless power transmitter 100. To
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`BRIEF DESCRIPTION OF THE DRAWINGS
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`[0042] The above and other aspects, features and other
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`advantages of the present invention will be more clearly
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`understood from the following detailed description taken in
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`conjunction with the accompanying drawings, in which:
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`FIG. 1 is a perspective view schematically showing
`[0043]
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`an electronic device and a charging device according to an
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`embodimentof the present invention;
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`FIG. 2 is a cross-sectional view taken along line
`[0044]
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`A-A'of FIG.1,
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`[0045]
`FIG.3 is a perspective view of a contactless power
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`receiver according to an embodimentofthe presentinvention;
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`FIG. 4 is an exploded perspective view schemati-
`[0046]
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`cally showing a coil unit of a contactless power receiver
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`accordingto a first embodimentofthe present invention;
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`FIG. 5is a perspective view showing a coil unit of a
`[0047]
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`contactless power receiver according to a second embodi-
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`mentof the present invention;
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`[0048]
`FIG. 6 is a cross-sectional view taken along line
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`C-C'of FIG.5;
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`[0049]
`FIGS. 7A and 7B are, respectively, a perspective
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`view and a cross-sectional view schematically showing an
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`electronic device including a contactless power receiver and
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`an antenna module according to an embodiment of the
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`present invention; and
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`FIGS. 8A and 8B are, respectively, a perspective
`[0050]
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`view and a cross-sectional view schematically showing an
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`Page 8 of 13
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`Page 8 of 13
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`

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`US 2012/0274148 Al
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`Nov. 1, 2012
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`this end, the charging device 20 may include a voltage con-
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`verter 22 converting the household AC power into the AC
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`voltage having a predetermined frequency.
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`[0060] When the above-mentioned AC voltage is applied to
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`a coil part of the contactless power transmitter 100, a mag-
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`netic field in the vicinity of the coil part changes. Therefore,
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`the contactless power receiver 300 ofthe electronic device 10
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`disposed to be adjacent to the contactless power transmitter
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`100 has voltage applied thereto according to a change in
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`magnetic field, such that the battery 12 is charged.
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`[0061] Hereinafter,
`the contactless power receiver 300
`includedin the above-mentionedelectronic device 10 will be
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`described in detail.
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`FIG.3 is a perspective view of a contactless power
`[0062]
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`receiver according to an embodimentofthe present invention.
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`A contactless power receiver 300 according to an embodi-
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`ment of the present invention includes a coil unit 310 and a
`circuit unit 320.
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`[0063] The coil unit 310 and the circuit unit 320 may be
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`integrally formedin a flexible substrate.
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`Theflexible substrate is a thin film substrate includ-
`[0064]
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`ing the coil unit 310 and the circuit unit 320 formed thereon.
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`As the flexible substrate, a flexible printed circuit board
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`(FPCB) maybe used.
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`Theflexible substrate according to the embodiment
`[0065]
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`of the present invention may be any substrate such as a film
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`type printed circuit board,a thin type printed circuit board, or
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`the like as long asit has a thin thickness and includes a wiring
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`pattern formedthereon. The coil unit and thecircuit unit may
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`also be implementedona flexible printed circuit board made
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`ofpolyimide ora frameretardant 4 (FR-4) type printedcircuit
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`board, without being limited thereto. In the case that a printed
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`circuit board made of an FR-4 material is used, costs may be
`further reduced.
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`[0066] According to the embodimentofthe present inven-
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`tion, coil patterns and circuit patternsthat have desired shapes
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`may be formed on the flexible substrate using several meth-
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`ods such as an etching method,a lithography method,a print-
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`ing method, a deposition method, or the like. In addition,
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`components for wireless charging are mountedonthe flexible
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`substrate having the circuit patterns and the coil patterns
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`formed thereon using a surface mounting technology (SMT),
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`wherebythe coil unit and the circuit unit may be implemented
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`on a single flexible substrate.
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`[0067] According to the embodimentofthe present inven-
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`tion,the coil unit and the circuit unit are configured on a single
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`flexible substrate, whereby the contactless power receiver
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`maybe significantly slim. In addition, the contactless power
`receiver is attached to a structure such as a case ofa cellular
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`phoneusing a simple attachment method such as the use of
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`double sided tape, whereby a manufacturing cost and a pro-
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`cess cost may be reduced.
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`[0068]
`In addition, since the contactless powerreceiver is
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`implemented on the flexible substrate,
`it may be simply
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`attached even to an electronic device having a curved shape.
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`Therefore, the contactless power transmission device may be
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`flexibly applied.
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`[0069] According to the embodimentofthe present inven-
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`tion, both the coil unit 310 and the circuit unit 320 may be
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`implemented on a single flexible substrate. Therefore, the
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`contactless powerreceiver 300 including the coil unit 310 and
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`the circuit unit 320 may be provided without performing a
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`separate bonding process between the coil unit 310 and the
`circuit unit 320.
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`Page 9 of 13
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`[0070] The coil unit 310 and the circuit unit 320 may be
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`connected to each other by first and second contact pads 315
`and 317. When a connection terminal is formed at an inner
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`portion of a flat coil, the coil unit 310 may beelectrically
`connectedto the circuit unit 320 in a schemein which the coil
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`unit is connectedto the second contact pad 317 through a third
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`contact pad 313 formed at the inner portion without being
`limited thereto.
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`[0071] According to the embodimentof the present inven-
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`tion,the circuit unit 320 may includefirst and second exposed
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`pads 321 and 323 formed therein. Therefore, power received
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`through the coil unit 310 may be processed throughthe circuit
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`unit 320 and be then connected to a battery (not shown)
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`throughthe first and second exposed pads 321 and 323.
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`[0072]
`In the contactless power receiver 300 according to
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`the embodimentofthe present invention, the coil unit 310 and
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`the circuit unit 320 may be integrally formed on the flexible
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`substrate. Therefore, the contactless power receiver 300 may
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`be simply implementedin the electronic device 10 using only
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`a process of attaching the contactless powerreceiver 300 to
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`the case in which the contactless power receiver 300 is to be
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`received or mounting the contactless power receiver 300 in
`the case.
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`[0073] According to the embodimentof the present inven-
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`tion, since the flexible substrate only needs to be mounted in
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`the case without performing a separate connection process
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`betweenthe coil unit 310 and the circuit unit 320, a manufac-
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`turing process of the electronic device may be simplified. In
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`addition, since the coil unit 310 andthe circuit unit 320 are
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`providedin a state in whichthey are processed, are connected
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`to each other on the flexible substrate, movement and con-
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`veyanceof a productis facilitated and precision in the manu-
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`facturing thereof increases.
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`FIG. 4 is an exploded perspective view of part C,
`[0074]
`which showsthe coil unit 310 of FIG.3.
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`[0075] Referring to FIG.4, the coil unit 310 of the contact-
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`less powerreceiver includes a coil part 110 and a magnetic
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`part 120.
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`[0076] The coil part 110 may include a substrate 112 anda
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`coil pattern 115 formed on the substrate 112.
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`[0077] The substrate 112 of the coil part 110 according to
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`the present embodiment may bea thin film substrate, for
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`example, a flexible substrate. In addition, according to the
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`embodimentofthe present invention,the circuit unit 320 may
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`be mounted, together with the coil part 110, on the flexible
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`substrate on which the coil part 110 is mounted. Thecircuit
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`unit 320 and the coil unit 310 may be mounted and provided
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`integrally with each other ontheflexible substrate.
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`[0078] Thecoil pattern 115 may be formedto have a wiring
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`pattern form on at least one surface of the substrate 112. The
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`coil pattern 115 according to the present embodimenthas a
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`vortex shape on a plane formed by the substrate 112 and
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`includes contact pads 118 formedat both endsthereofso as to
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`electrically connect the coil pattern 115 to the outside.
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`[0079] Although the embodiment of FIG. 4 discloses two
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`contact pads, that is, that first and second contact pads are
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`formedat both endsofflat coil ofthe coil pattern 115, thefirst
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`and second contact pads are not necessarily limited to the
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`above-mentioned configuration. For example, any oneof the
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`first and second contact pads may be formed to traverse
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`another contact pad, such that the first and second contact
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`pads maylead to the sameside of the coil pattern 115.
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`[0080] Here, a top perspective view of the coil part 110
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`illustrated up to the coil pattern 115 andthe contact pads 118
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`Page 9 of 13
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`

`

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`US 2012/0274148 Al
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`Nov. 1, 2012
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`formed on a lower surface of the substrate 112 is shown in
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`FIG.4. In addition, the contact pads 118 are connectedto the
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`circuit unit 320 through the wiring pattern.
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`[0081] The coil pattern 115 according to the present
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`embodimentincludesa plurality of coil strands 115¢ to 115e
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`disposed in parallel with each other. Here, all of the plurality
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`of coil strands 115a to 115e are electrically connected to the
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`same contact pad 118. Therefore, the coil strands 115a to
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`115e are connectedin parallel with each other to thereby form
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`a single coil pattern 115.
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`[0082] The present embodiment describes a case in which
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`the coil pattern 115 formed on onesurface ofthe substrate 112
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`includes the five coil strands 115a@ to 115e, by way of
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`example. In this case, each ofthe coil strands 1152 to 115¢ of
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`the coil pattern 115 is disposed to be spaced apart from other
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`coil strands at predetermined intervals in parallel therewith.
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`[0083] The present embodiment describes a case in which
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`the coil pattern 115 has a generally rectangular vortex shape,
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`by way of example; however, the coil pattern 115 of the
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`present invention is not limited thereto but may be variously
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`applied. For example, the coil pattern 115 may have a circular
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`vortex shape, a polygonal vortex shape,or thelike.
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`[0084] The coil pattern 115 mayincludean insulating pro-
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`tective layer (for example, a resin insulating layer (not
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`shown)) formed on an upperportion thereof, as needed, such
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`that the insulating protective layer protects the coil pattern
`115 from the outside.
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`[0085] The magnetic part 120 hasa flat plate shape (or a
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`sheet shape), is disposed on one surface ofthe coil part 110,
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`and is fixedly attached to the coil part 110. The magnetic part
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`120 is provided in orderto efficiently form a magnetic path of
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`amagneticfield generated by the coil pattern 115. To this end,
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`the magnetic part 120 may be made of a material through
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`which a magnetic path may be easily formed, and more spe-
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`cifically, be formed of a ferrite sheet.
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`[0086] However, the magnetic part 120 according to the
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`present embodimentis not limited to the above-mentioned
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`configuration but may be variously applied. For example, the
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`magnetic part 120 may be formedby applyingferrite powder
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`or a magnetic solution to one surface of the coil part 110.
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`[0087] Meanwhile, although not shown, the magnetic part
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`120 may include a metal sheet added to an outer surface
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`thereof, as needed, such that the metal sheet shields electro-
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`magnetic wavesor leakage flux. The metal sheet may be made
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`of aluminum, or the like; however, a material of the metal
`sheet is not limited thereto.
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`[0088]
`In addition, an adhesion part 140 maybe interposed
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`between the coil part 110 and the magnetic part 120 so that the
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`coil part 110 and the magnetic part 120 ofth