Magnetic shielding sheet and manufacturing method therefor
AssigneeAmosense Co., Ltd.
InventorKil Jae Jang
Life of this patent
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Abstract
A magnetic shielding sheet and a manufacturing method therefor are provided. The magnetic shielding sheet according to an embodiment of the present invention, which is placed on one surface of an antenna comprising a hollow part disposed at the center thereof and having a predetermined area and a pattern part surrounding the hollow part, may comprise: a sheet body which is made of a magnetic material so as to be able to shield a magnetic field; and at least one eddy current-reducing pattern part which is formed in the sheet body so as to increase the resistance of the sheet body so that the occurrence of eddy current can be reduced.
Claims16
A magnetic shielding sheet disposed on one surface of an antenna, the magnetic shielding sheet including a hollow part having a predetermined area at a center thereof and an eddy current-reducing pattern part surrounding the hollow part, the magnetic shielding sheet comprising:
- a sheet body made of a magnetic material to shield a magnetic field;
- and
- at least one eddy current-reducing pattern part formed in the sheet body to increase resistance of the sheet body so that occurrence of an eddy current is reduced;
- wherein the antenna is a combo antenna unit in which a wireless power transmission antenna and a wireless communication antenna configured to surround a periphery of the wireless power transmission antenna are patterned on at least one surface of a circuit board;
- and
- the at least one eddy current-reducing pattern part is located in a region corresponding to the wireless power transmission antenna without being in a region corresponding to the wireless communication antenna among a total area of the sheet body.
A method of manufacturing a magnetic shielding sheet disposed on one surface of an antenna, the magnetic shielding sheet including a hollow part having a predetermined area at a center thereof and a pattern part surrounding the hollow part, the method comprising:
- a first operation of preparing a plate-shaped magnetic sheet made of a magnetic material and having a first area;
- and
- a second operation of applying pressure to a local area of a shielding sheet so that the local area among an inner region of the shielding sheet is separated into a plurality of pieces while being separated from the magnetic sheet into a shielding sheet having a second area which is relatively smaller than the first area;
- wherein the second operation is performed through a mold including a cutting blade for processing an edge of the shielding sheet, and at least one pressurizing member disposed inside the cutting blade and provided for pressurizing the local area of the magnetic sheet.
A method of manufacturing a magnetic shielding sheet disposed on one surface of an antenna, the magnetic shielding sheet including a hollow part having a predetermined area at a center thereof and a pattern part surrounding the hollow part, the method comprising:
- a first operation of preparing a plate-shaped magnetic sheet made of a magnetic material and having a first area;
- an operation of firstly punching a sheet body to form a through part having a predetermined width and length in an inner region of the sheet body and form a plurality of cracks extending from the through part;
- and
- an operation of secondarily punching the sheet body to form a shielding sheet including the through part and having a second area which is relatively smaller than the first area,
- wherein the operation of firstly punching the sheet body is performed through a mold including a ring-shaped edge blade for forming an edge of the through part and a separation member formed in an inner region of the edge blade to pressurize and separate a cut piece cut from the sheet body by the edge blade.
A method of manufacturing a magnetic shielding sheet disposed on one surface of an antenna, the magnetic shielding sheet including a hollow part having a predetermined area at a center thereof and a pattern part surrounding the hollow part, the method comprising:
- a first operation of preparing a plate-shaped magnetic sheet made of a magnetic material and having a first area;
- an operation of firstly punching a sheet body to form a through part having a predetermined width and length in an inner region of the sheet body and form a plurality of cracks extending from the through part;
- and
- an operation of secondarily punching the sheet body to form a shielding sheet including the through part and having a second area which is relatively smaller than the first area,
- wherein the operation of secondarily punching the sheet body is an operation of forming an outer edge defining the second area in the sheet body so that the shielding sheet is separated from the sheet body.
Dependencies are inferred from the claim text.