Circuit board and smart card for fingerprint recognition including the same
A circuit board according to an embodiment includes: a substrate including one surface and the other surface; a first circuit pattern disposed on the one surface; and a second circuit pattern disposed on the other surface, wherein at least one via is formed in the substrate, and the first circuit pattern and the second circuit pattern are wire-bonded through the via to conduct electricity.
1. A circuit board comprising:
a substrate including one surface and an other surface;
a first circuit pattern disposed on the one surface;
a second circuit pattern disposed on the other surface,
a first adhesive layer on the one surface of the substrate; and
a second adhesive layer on the other surface of the substrate,
wherein the first circuit pattern directly contacts the first adhesive layer,
wherein the second circuit pattern directly contacts the second adhesive layer,
wherein a plurality of vias are formed in the substrate, and
the first circuit pattern and the second circuit pattern are wire-bonded through one of the vias to conduct electricity.
2. The circuit board of claim 1 , wherein the first circuit pattern includes a plurality of first circuit pattern portions spaced apart from each other,
the second circuit pattern includes a plurality of second circuit pattern portions spaced apart from each other, and
connection regions of a plurality of wires connected to the plurality of second circuit patterns are disposed in a region corresponding to one of the plurality of first circuit pattern portions.
3. The circuit board of claim 1 , wherein a minimum distance between the second circuit pattern and the vias is smaller than a minimum distance between adjacent vias.
4. The circuit board of claim 1 , wherein the first circuit pattern or the second circuit pattern is electrically connected to a fingerprint sensor and a chip.
5. The circuit board of claim 1 , wherein the one surface is a contact side, and the other surface is a bonding side connected to an external chip.
6. The circuit board of claim 1 , comprising
an adhesive layer disposed between the substrate and the first circuit pattern and between the substrate and the second circuit pattern.
7. The circuit board of claim 1 , wherein a pad portion is disposed on one surface of the first circuit pattern and is in contact with the wire.
8. The circuit board of claim 1 , wherein the first circuit pattern includes a first metal layer and a second metal layer on the first metal layer,
the second circuit pattern includes a third metal layer and a fourth metal layer on the third metal layer,
the first metal layer and the third metal layer include at least one of gold (Au), silver (Ag), platinum (Pt), titanium (Ti), tin (Sn), copper (Cu), and zinc (Zn), and
the second metal layer and the fourth metal layer include nickel-gold (Ni—Au) or nickel-lead (Ni—Pd).
9. The circuit board of claim 1 , wherein the first circuit pattern includes a first circuit pattern portion, a second circuit pattern portion, a third circuit pattern portion, a fourth circuit pattern portion, a fifth circuit pattern portion, and a sixth circuit pattern portion that are disposed to be spaced apart from one another, and
the second circuit pattern includes a seventh circuit pattern portion, an eighth circuit pattern portion, a ninth circuit pattern portion, a tenth circuit pattern portion, an eleventh circuit pattern portion, and a twelfth circuit pattern portion that are disposed to be spaced apart from one another.
10. The circuit board of claim 9 , wherein the seventh circuit pattern portion, the eighth circuit pattern portion, the ninth circuit pattern portion, the tenth circuit pattern portion, the eleventh circuit pattern portion, and the twelfth circuit pattern portion are connected to one among the first circuit pattern portion, the second circuit pattern portion, the third circuit pattern portion, the fourth circuit pattern portion, the fifth circuit pattern portion, and the sixth circuit pattern portion.
11. The circuit board of claim 9 , wherein the seventh circuit pattern portion, the eighth circuit pattern portion, the ninth circuit pattern portion, the tenth circuit pattern portion, the eleventh circuit pattern portion, and the twelfth circuit pattern portion are connected only to a region corresponding to the first circuit pattern portion.
12. The circuit board of claim 10 , wherein the plurality of vias include a first via formed in a region corresponding to the first circuit pattern portion, a second via formed in a region corresponding to the second circuit pattern portion, a third via formed in a region corresponding to the third circuit pattern portion, a fourth via formed in a region corresponding to the fourth circuit pattern portion, a fifth via formed in a region corresponding to the fifth circuit pattern portion, and a sixth via formed in a region corresponding to the sixth circuit pattern portion.
13. The circuit board of claim 12 , wherein the first circuit pattern portion and the seventh circuit pattern portion are connected to a first wire through the first via,
the second circuit pattern portion and the eighth circuit pattern portion are connected to a second wire through the second via,
the third circuit pattern portion and the ninth circuit pattern portion are connected to a third wire through the third via,
the fourth circuit pattern portion and the tenth circuit pattern portion are connected to a fourth wire through the fourth via,
the fifth circuit pattern portion and the eleventh circuit pattern portion are connected to a fifth wire through the fifth via, and
the sixth circuit pattern portion and the twelfth circuit pattern portion are connected to a sixth wire through the sixth via.
14. The circuit board of claim 13 , comprising
a molding member disposed on a first connection region between the seventh circuit pattern portion and the first wire, a second connection region between the eighth circuit pattern portion and the second wire, a third connection region between the ninth circuit pattern portion and the third wire, a fourth connection region between the tenth circuit pattern portion and the fourth wire, a fifth connection region between the eleventh circuit pattern portion and the fifth wire, and a sixth connection region between the twelfth circuit pattern portion and the sixth wire.
15. A smart card for fingerprint recognition comprising:
a card body including an opening; and
a circuit board accommodated in the opening of the card body,
wherein the card body includes:
a chip that stores fingerprint information;
a micro controller unit;
a battery for supplying power to the micro controller unit; and
a fingerprint sensor supplied with the power by the micro controller unit, and
the circuit board includes:
a substrate including one surface and the other surface;
a first circuit pattern disposed on the one surface; and
a second circuit pattern disposed on the other surface,
wherein at least one via is formed in the substrate,
wherein the first circuit pattern and the second circuit pattern are wire-bonded through the via to conduct electricity, and
wherein the circuit board is electrically connected to the fingerprint sensor and the chip.
16. The smart card for fingerprint recognition of claim 15 , wherein the card body includes an antenna.
17. The circuit board of claim 14 , wherein a distance between the first connection region and the first via is smaller than a distance between the first connection region and the fourth connection region.
18. The circuit board of claim 14 , wherein a distance between the first connection region and the first via is smaller than a minimum distance between adjacent vias.
19. The circuit board of claim 14 , wherein a distance between the first connection region and the second connection region is smaller than a distance between the first via and the third via.
20. The circuit board of claim 14 , wherein a size of the connection regions is smaller than a size of the vias.