METHOD OF MANUFACTURING MAGNETIC SUBSTANCE AND METHOD OF MANUFACTURING WIRELESS COMMUNICATIONS ANTENNA INCLUDING THE SAME
A method of manufacturing a magnetic substance includes forming crack lines arranged in one direction on a magnetic sheet by crushing the magnetic sheet to divide the magnetic sheet by the crack lines; stacking the magnetic sheet with other magnetic sheets into layers; and press-processing the stacked magnetic sheets.
1 . A method of manufacturing a magnetic substance, the method comprising:
forming crack lines arranged in one direction on a magnetic sheet by crushing the magnetic sheet to divide the magnetic sheet by the crack lines;
stacking the magnetic sheet with other magnetic sheets into layers; and
press-processing the stacked magnetic sheets.
2 . The method of claim 1 , wherein:
the magnetic sheet is divided into unit ribbons by the crack lines; and
each of the unit ribbons has an aspect ratio of 1:6 to 1:9.
3 . The method of claim 2 , wherein the aspect ratio is an aspect ratio of a width to a length of each of the of unit ribbons.
4 . The method of claim 1 , wherein the crack lines have a pitch of 1.25 mm or more and 5 mm or less.
5 . The method of claim 1 , further comprising:
before the crushing of the magnetic sheet, forming an adhesive layer on one surface of the magnetic sheet.
6 . The method of claim 1 , wherein, in the stacking of the magnetic sheet, the magnetic sheet is stacked so that a crack line of the magnetic sheet overlaps a crack line of an adjacent magnetic sheet of the other magnetic sheets.
7 . The method of claim 1 , wherein, in the stacking of the magnetic sheet, the magnetic sheet is stacked so that a crack line of the magnetic sheet is offset from a crack line of an adjacent magnetic sheet of the other magnetic sheets.
8 . The method of claim 1 , wherein, in the stacking of the magnetic sheet, the magnetic sheet is stacked so that a crack line of the magnetic sheet overlaps a crack line of an adjacent magnetic sheet of the other magnetic sheets and another crack line of the magnetic sheet is offset from the crack line of the adjacent magnetic sheet.
9 . The method of claim 1 , wherein, in the crushing of the magnetic sheet, the crack lines are formed so that a pitch of the crack lines is uniform.
10 . The method of claim 1 , wherein, in the crushing of the magnetic sheet, the crack lines are formed by applying a roller having protrusions to the magnetic sheet.
11 . The method of claim 10 , wherein the protrusions of the roller are formed linearly to be perpendicular to a direction in which the roller moves.
12 . The method of claim 11 , wherein the protrusions of the roller are formed parallel to an axis of rotation of the roller.
13 . The method of claim 1 , further comprising:
stacking a resin layer to form an outer layer of the stacked magnetic sheets.
14 . A method of manufacturing a wireless communications antenna, the method comprising:
forming crack lines arranged in one direction on a magnetic sheet by crushing the magnetic sheet to divide the magnetic sheet by crack lines;
stacking the magnetic sheet with other magnetic sheets into layers;
press-processing the stacked magnetic sheets;
bonding a first substrate to a top surface of the stacked magnetic sheets and a second substrate to a bottom surface of the stacked magnetic sheets; and
forming conductive vias configured to connect conductive patterns on the first substrate with conductive patterns on the second substrate.
15 . The method of claim 14 , wherein, in the stacking of the magnetic sheet, the magnetic sheet is stacked so that the crack lines of the magnetic sheet overlap crack lines of an adjacent magnetic sheet of the other magnetic sheets.
16 . The method of claim 14 , wherein, in the stacking of the magnetic sheet, the magnetic sheet is stacked so that crack lines of the magnetic sheet are offset from crack lines of an adjacent stacked magnetic sheet of the other magnetic sheets.
17 . The method of claim 14 , wherein the crack lines have a pitch of 1.25 mm or more and 5 mm or less.
18 . The method of claim 14 , wherein
the conductive patterns and the conductive vias form a solenoid coil, and
the one direction is parallel to an axis of the solenoid coil.
19 . The method of claim 14 , further comprising:
forming a reinforcing layer disposed between the first substrate and the second substrate, at an outer portion of the stacked magnetic sheets.
20 . The method of claim 14 , further comprising:
stacking a resin layer to form an outer layer of the stacked magnetic sheets.