Electronic device and manufacturing method thereof

Patent metadata

Field	Value
Publication number	US-9481037-B2
Application number	US-201414507849-A
Country	US
Kind code	B2
Filing date	Oct 7, 2014
Priority date	May 15, 2009
Publication date	Nov 1, 2016
Grant date	Nov 1, 2016

Abstract

A method for manufacturing an electronic device, the method comprising: providing a conducting wire; forming a mixture with the conducting wire buried therein, wherein the mixture comprises: a first magnetic powder and a second magnetic powder, wherein the mean particle diameter of the first magnetic powder is larger than the mean particle diameter of the second magnetic powder, and the Vicker's Hardness of the first magnetic powder is greater than the Vicker's Hardness of the second magnetic powder by a first hardness difference; and performing a molding process on the conducting wire and the mixture, wherein by means of the first hardness difference of the first magnetic powder and the second magnetic powder, the mixture and the conducting wire buried therein are combined to form an integral magnetic body at a temperature lower than the melting point of the conducting wire.

First claim

What is claimed is:

1. A method for manufacturing an electronic device, the method comprising:
providing an insulated conducting wire;
forming a mixture with the insulated conducting wire buried therein, wherein the mixture comprises: a first magnetic powder and a second magnetic powder, wherein the mean particle diameter of the first magnetic powder is larger than the mean particle diameter of the second magnetic powder, and the Vicker's Hardness of the first magnetic powder is greater than the Vicker's Hardness of the second magnetic powder by a first hardness difference; and
performing a molding process on the insulated conducting wire and the mixture, wherein by means of the first hardness difference of the first magnetic powder and the second magnetic powder, the mixture and the insulated conducting wire buried therein are combined to form an integral magnetic body at a temperature lower than the melting point of the insulated conducting wire.

2. The method according to claim 1 , wherein the molding process is performed at the temperature lower than 300° C.

3. The method according to claim 1 , wherein performing the molding process comprises applying a molding pressure to the mixture, wherein molding pressure of the molding process is 6 t/cm 2 -11 t/cm 2 .

4. The method according to claim 1 , wherein the mixture further comprises an adhesive joining the first magnetic powder and the second magnetic powder.

5. The method according to claim 4 , wherein a material of the adhesive is thermoset resin.

6. The method according to claim 1 , wherein the Vicker's Hardness of the first magnetic powder is greater than or equal to 150, and the Vicker's Hardness of the second magnetic powder is smaller than or equal to 100.

7. The method according to claim 1 , wherein the Vicker's Hardness of the first magnetic powder is greater than or equal to 250, and the Vicker's Hardness of the second magnetic powder is smaller than or equal to 80.

8. The method according to claim 1 , wherein the mean particle diameter of the second magnetic powder is smaller than or equal to 10 μm.

9. The method according to claim 1 , wherein the ratio of the mean particle diameter of the first magnetic powder to the mean particle diameter of the second magnetic powder is larger than 2.

10. The method according to claim 1 , wherein the ratio of the mean particle diameter of the first magnetic powder to the mean particle diameter of the second magnetic powder is 2.5-10.

11. The method according to claim 1 , wherein a material of the first magnetic powder comprises metal alloy.

12. The method according to claim 1 , wherein a material of the first magnetic powder comprises Fe—Cr—Si alloy, Fe—Ni alloy, amorphous alloy, Fe—Si alloy, or Fe—Al—Si alloy.

13. The method according to claim 1 , wherein a material of the second magnetic powder comprises iron or ferroalloy.

14. The method according to claim 1 , wherein a material of the first magnetic powder comprises amorphous alloy and a material of the second magnetic powder comprises iron.

15. The method according to claim 1 , wherein the insulated conducting wire has a winding shape.

16. A method for manufacturing an electronic device, the method comprising:
providing an insulated conducting wire;
forming a mixture with the insulated conducting wire buried therein, wherein the mixture comprises: a first magnetic powder and a second magnetic powder, wherein the mean particle diameter of the first magnetic powder is larger than the mean particle diameter of the second magnetic powder, and the first magnetic powder and the second magnetic powder have a first Vicker's Hardness difference therebetween; and
performing a molding process on the insulated conducting wire and the mixture, wherein by means of the first Vicker's Hardness difference of the first magnetic powder and the second magnetic powder, the mixture and the insulated conducting wire buried therein are combined to form an integral magnetic body at a temperature lower than the melting point of the insulated conducting wire.

17. The method according to claim 16 , wherein the molding process is performed at the temperature lower than 300° C.

18. The method according to claim 16 , wherein performing the molding process comprises applying a molding pressure to the mixture, wherein molding pressure of the molding process is 6 t/cm 2 -11 t/cm 2 .

19. The method according to claim 16 , wherein the mixture further comprises an adhesive joining the first magnetic powder and the second magnetic powder.

20. A method for manufacturing an electronic device, the method comprising:
providing a conducting wire;
forming a mixture with the conducting wire buried therein, wherein the mixture comprises: a first magnetic powder and a second magnetic powder, wherein the mean particle diameter of the second magnetic powder is smaller than or equal to 4 μm, the mean particle diameter of the first magnetic powder is larger than the mean particle diameter of the second magnetic powder, and the Vicker's Hardness of the first magnetic powder is greater than the Vicker's Hardness of the second magnetic powder by a first hardness difference; and
performing a molding process on the conducting wire and the mixture, wherein by means of the first hardness difference of the first magnetic powder and the second magnetic powder, the mixture and the conducting wire buried therein are combined to form an integral magnetic body at a temperature lower than the melting point of the conducting wire.

Assignees

• Cyntec Co Ltd

Inventors

• Liao Wen-Hsiung
• Hsieh Roger
• Ikuta Hideo
• Chen Yueh-Lang

Classifications

• H01F3/08 Primary

  made from powder (powder coatings on sheets H01F3/02; on strips or ribbons H01F3/04; on wires H01F3/06) · CPC title

• H01F41/0246

  Manufacturing of magnetic circuits by moulding or by pressing powder (magnetic cores made by moulding or by pressing powder H01F27/255; soft magnetic particles H01F1/20, H01F1/36) · CPC title

• H01F27/292

  Surface mounted devices · CPC title

• B22F3/16

  in successive or repeated steps · CPC title

• H01F1/22

  pressed, sintered, or bound together · CPC title