Magnetic shielding sheet and wireless power transfer module including the same
View Patent ↗A magnetic shielding sheet is provided. The magnetic shielding sheet according to an embodiment of the present invention comprises: a plate-shaped magnetic sheet made of a magnetic material containing a metal component; and a cover member for covering the entire surface of the magnetic sheet so as to prevent the surface of the magnetic sheet from being exposed to the outside.
1. A magnetic shielding sheet comprising:
a magnetic sheet having a plate shape and made of a magnetic material including a metal component; and
a cover member configured to cover an entire surface of the magnetic sheet to prevent the surface of the magnetic sheet from being externally exposed,
wherein the magnetic sheet is a sheet which is flake-treated and divided into a plurality of fine pieces,
wherein the plurality of fine pieces includes fine pieces having at least one side formed in a curved shape rather than a straight line, and
wherein the number of the fine pieces having the at least one side formed in the curved shape is 50% or more of the total number of the plurality of fine pieces.
2. The magnetic shielding sheet of claim 1 , wherein the cover member is a protective film.
3. The magnetic shielding sheet of claim 1 , wherein the cover member includes a first cover member configured to cover an upper surface and side surfaces of the magnetic sheet and a second cover member configured to cover a lower surface of the magnetic sheet.
4. The magnetic shielding sheet of claim 1 , wherein the magnetic sheet is a thin ribbon sheet including at least one selected from an amorphous alloy and a nano-crystalline alloy.
5. The magnetic shielding sheet of claim 4 , wherein the magnetic sheet is a multilayer sheet in which a plurality of ribbon sheets are stacked as multiple layers through an adhesive layer.
6. The magnetic shielding sheet of claim 1 , wherein the number of the fine pieces having the at least one side formed in the curved shape is 70% or more of the total number of the plurality of fine pieces.
7. A wireless power transfer module comprising:
an antenna unit including at least one wireless power transfer antenna for wireless power transmission; and
a magnetic shielding sheet attached to one surface of the antenna unit through an adhesive layer so as to shield a magnetic field generated in the antenna unit;
wherein the magnetic shielding sheet includes:
a magnetic sheet having a plate shape and made of a magnetic material including a metal component; and
a cover member configured to cover an entire surface of the magnetic sheet to prevent the surface of the magnetic sheet from being externally exposed,
wherein the magnetic sheet is a sheet which is flake-treated and divided into a plurality of fine pieces,
wherein the plurality of fine pieces includes fine pieces having at least one side formed in a curved shape rather than a straight line, and
wherein the number of the fine pieces having the at least one side formed in the curved shape is 50% or more of the total number of the plurality of fine pieces.
8. The wireless power transfer module of claim 7 , wherein the wireless power transfer antenna is an antenna pattern patterned on at least one surface of a circuit board.
9. The wireless power transfer module of claim 8 , wherein the magnetic shielding sheet has a size that is relatively greater than that of the circuit board.
10. The wireless power transfer module of claim 7 , wherein the wireless power transfer module is a wireless power reception module embedded in a portable terminal.
11. The magnetic shielding sheet of claim 7 , wherein the cover member is a protective film.
12. The magnetic shielding sheet of claim 7 , wherein the cover member includes a first cover member configured to cover an upper surface and side surfaces of the magnetic sheet and a second cover member configured to cover a lower surface of the magnetic sheet.
13. The magnetic shielding sheet of claim 7 , wherein the magnetic sheet is a thin ribbon sheet including at least one selected from an amorphous alloy and a nano-crystalline alloy.
14. The magnetic shielding sheet of claim 13 , wherein the magnetic sheet is a multilayer sheet in which a plurality of ribbon sheets are stacked as multiple layers through an adhesive layer.