Magnetic film having wireless charging radiator condition, method of manufacturing the same, and wireless charging device using the same
Since the magnetic film of the present invention has a much thinner thickness compared to a corresponding conventional magnetic layer and radiator coil material assembly and has no adhesive layer or air layer between the magnetic layer and the radiator, permeability required at the time of charging can be improved, a loss rate can be reduced and high charging efficiency can be obtained, Furthermore, since a band width and a gain rate can be improved, the magnetic film can be very usefully applied to wireless charging products which pursue slimming in design.
1. A magnetic film having a radiator function for wireless charging, the magnetic film comprising:
a magnetic layer having a thin-film shape and composed of a magnetic layer composition containing a magnetic material powder and a binder resin; and
a thin-film coil for radiator use which is directly laminated on a surface of the magnetic layer,
wherein the binder resin contains an additive agent, which is mixed in the binder resin, in an amount of less than 2% based on a total weight of the composition of the binder resin and the additive agent, and
wherein the additive agent is any one of a silane coupling agent, a defoaming agent or a cross-linking agent.
2. The magnetic film of claim 1 , wherein the magnetic material powder is one element or an alloy of a combination of two or more elements selected from the group consisting of Fe, Ni, Co, Mn, Al, Zn, Cu, Ba, Ti, Sn, Sr, P, B, N, C, W, Cr, Bi, Li, Y and Cd, or ferrite powder.
3. The magnetic film of claim 1 , wherein a particle size of the magnetic material powder is 3 nm to 50 μm.
4. The magnetic film of claim 1 , wherein the binder resin is one resin or a mixture of two or more resins selected from the group consisting of a polyvinyl alcohol-based resin, a silicon-based resin, an epoxy-based resin, an acrylate-based rein, an urethane-based resin, a polyamide-based resin and a polyimide-based resin.
5. The magnetic film of claim 1 , wherein a mix proportion of the magnetic material powder to the binder in the magnetic layer composition is 10 to 90˜95 to 5 in a weight ratio.
6. The magnetic film of claim 1 , wherein a thickness of the metal thin-film coil ranges from 5 μm to 1 mm.
7. The magnetic film of claim 1 , wherein a pitch of the metal thin-film coil ranges from 5 to 500 μm.
8. A wireless charging device with the magnetic film having the radiator function as defined in claim 1 .