COIL ASSEMBLY WITH MULTIPLE COIL WIRINGS
A coil assembly includes an insulating plate, a first wiring disposed on a first surface of the insulating plate and comprising a first spiral wiring, and a second wiring disposed on a second surface of the insulating plate, and electrically connected to the first wiring, wherein the second wiring includes a second spiral wiring that extends from the first spiral wiring, and the first wiring and the second wiring have different cross-sectional shapes.
1 . A coil assembly comprising:
an insulating plate;
a first wiring disposed on a first surface of the insulating plate and comprising a first spiral wiring; and
a second wiring disposed on a second surface of the insulating plate, and electrically connected to the first wiring,
wherein the second wiring comprises a second spiral wiring that extends from the first spiral wiring, and
the first wiring and the second wiring have different cross-sectional shapes.
2 . The coil assembly of claim 1 , wherein the first wiring is formed so that a width of a bonded surface of the first wiring that is bonded to the insulating plate is narrower than a width of an opposite surface of the bonded surface of the first wiring, and
the second wiring is formed so that a width of a bonded surface of the second wiring that is bonded to the insulating plate is greater than or equal to a width of an opposite surface of the bonded surface of the second wiring.
3 . The coil assembly of claim 1 , wherein the first wiring is bonded to the insulating plate through an adhesive layer, and
the second wiring is directly bonded to the insulating plate.
4 . The coil assembly of claim 1 , further comprising a connection conductor disposed to penetrate through the insulating plate,
wherein the first wiring and the second wiring are electrically connected to each other through the connection conductor.
5 . The coil assembly of claim 1 , wherein the first wiring comprises a leading part disposed to be spaced apart from the first spiral wiring, and
the second wiring comprises a connection wiring that extends in an outer diameter direction from the second spiral wiring, and the connection wiring is connected to the leading part.
6 . The coil assembly of claim 5 , wherein the first wiring comprises an insertion groove formed in a position that faces the connection wiring, and
at least a portion of the connection wiring is disposed in the insertion groove.
7 . The coil assembly of claim 5 , wherein the connection wiring is branched into a plurality of paths.
8 . The coil assembly of claim 5 , wherein the connection wiring has a line width greater than the first wiring or the second spiral wiring.
9 . The coil assembly of claim 5 , wherein the first wiring comprises a connection part disposed to be spaced apart from the first spiral wiring,
the second wiring comprises an arc shaped wiring disposed to be spaced apart from the second spiral wiring, and
the second spiral wiring and the arc shaped wiring are electrically connected to each other through the connection part.
10 . The coil assembly of claim 1 , wherein the second wiring further comprises:
a connection wiring that extends in an outer diameter direction from the second spiral wiring;
connection parts that respectively extend from the first spiral wiring and the connection wiring; and
connection pads included in end portions of the connection parts.
11 . The coil assembly of claim 10 , further comprising a protective member disposed to cover the second wiring,
wherein the connection pads comprise a region in which the connection parts are exposed externally from the protective member through pad holes formed in the protective member.
12 . The coil assembly of claim 11 , further comprising a metal layer stacked on the connection parts exposed through the pad holes of the protective member.
13 . The coil assembly of claim 1 , wherein the second spiral wiring is formed in an arc shape.
14 . The coil assembly of claim 1 , wherein the second wiring is formed of a metal thin film wiring printed with a conductive material on the insulating plate.
15 . The coil assembly of claim 1 , further comprising:
a first coil wiring configured by the first wiring and the second wiring; and
a second coil wiring disposed to be stacked with the first coil wiring,
wherein the first coil wiring and the second coil wiring each perform any one function of transmission and reception of power for wireless charging, radio frequency identification (RFID), near filed communication (NFC), and magnetic secure transmission (MST).
16 . The coil assembly of claim 15 , wherein the second coil wiring is in a proximate location to the first coil wiring.
17 . The coil assembly of claim 1 , wherein the second wiring has a thickness equal to or less than the first wiring.
18 . The coil assembly of claim 1 , wherein the second spiral wiring has a line width equal to or less than the first spiral wiring.
19 . A coil assembly comprising:
an insulating plate; and
a coil wiring comprising a first wiring disposed on a first surface of the insulating plate and a second wiring disposed on a second surface of the insulating plate,
wherein the first wiring comprises an insertion groove formed in a position that faces the second wiring, and
at least a portion of the second wiring is disposed in the insertion groove.
20 . The coil assembly of claim 19 , wherein the coil wiring comprises spiral wirings, and
the spiral wirings are disposed to be distributed in the first wiring and the second wiring.
21 . The coil assembly of claim 19 , wherein a spiral wiring of the second wiring has a line width narrower than a spiral wiring of the first wiring.
22 . The coil assembly of claim 19 , wherein a spiral wiring of the second wiring is disposed at a position that corresponds to a center region of the coil wiring that is formed by a spiral wiring of the first wiring.
23 . A coil assembly method comprising:
bonding a first wiring to a first surface of an insulating plate using an adhesive substrate;
printing a conductive material on a second surface of the insulating plate to form a second wiring;
printing a connection conductor on the second surface of the insulating plate; and
electrically connecting the first wiring to the second wiring through the connection conductor to form the coil assembly.
24 . The method of claim 23 , further comprising attaching a first protective member to a surface of the first wiring and attaching a second protective member to a surface of the second wiring.
25 . The method of claim 24 , wherein the first wiring and the second wiring have different cross-sectional shapes.