COIL UNIT AND ELECTRONIC APPARATUS USING THE SAME

• US 20090267721A1
• Filed: 04/22/2009
• Published: 10/29/2009
• Est. Priority Date: 04/25/2008
• Status: Abandoned Application

• Current Assignee: Seiko Epson Corporation (Seiko Group)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: Jin, Mikimoto, Yoda, Kentaro, Okada, Hirofumi, Kamijo, Takahiro
• Application Number:
  US12/428,199
• Publication Number:
  US 20090267721A1
• Time in Patent Office: Days
• US Class Current: 336/232
• CPC Class Codes: H01F 27/24 Magnetic cores
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: H02J 50/12 of the resonant type
• CPC Class Codes: H02J 50/70 involving the reduction of electric, magnetic or electromagnetic leakage fields
• CPC Class Codes: H02J 50/90 involving detection or optimisation of position, e.g. alignment

Abstract

A coil unit includes a coil and a magnetic substance for receiving magnetic force lines generated by the coil, the magnetic substance including a first magnetic substance having a first magnetic permeability and a second magnetic substance having a second magnetic permeability.

Claims

1. A coil unit, comprising:

a coil; and

a magnetic substance that receives magnetic lines of force generated by the coil, the magnetic substance including;

a first magnetic substance having a first magnetic permeability; and

a second magnetic substance having a second magnetic permeability.

2. The coil unit according to claim 1,

the first magnetic substance and the second magnetic substance being laminated.

3. The coil unit according to claim 1,

the coil having a first equivalent resistance, a first inductance, and a first Q value.

4. The coil unit according to claim 3,

the second magnetic permeability being higher than the first magnetic permeability, and

a second equivalent resistance being smaller than a third equivalent resistance, the second equivalent resistance being an equivalent resistance of the coil in a first use condition in which the first magnetic substance is disposed alone, the third equivalent resistance being an equivalent resistance of the coil in a second use condition in which the second magnetic substance is disposed alone, and a second inductance being smaller than a third inductance, the second inductance being an inductance of the coil in the first use condition, the third inductance being an inductance of the coil in the second use condition.

5. The coil unit according to claim 4,

the first Q value being larger than a second Q value and a third Q value, the second Q value being a Q value of the coil in the first use condition, the third Q value being a Q value of the coil in the second use condition.

6. The coil unit according to claim 5,

the magnetic substance being disposed at a side adjacent to one surface of the coil, and the first magnetic substance being disposed between the coil and the second magnetic substance.

7. The coil unit according to claim 6,

the first inductance being larger than the second inductance and smaller than the third inductance.

8. The coil unit according to claim 4,

the first equivalent resistance being larger than the second equivalent resistance and smaller than the third equivalent resistance.

9. The coil unit according to claim 4,

the first Q value being smaller than a fourth Q value and larger than a fifth Q value, the fourth Q value being a Q value of the coil in a third use condition in which two pieces of the first magnetic substance are disposed in a stacked manner, the fifth Q value being a Q value of the coil in a fourth use condition in which two pieces of the second magnetic substance are disposed in a stacked manner.

10. The coil unit according to claim 9,

the first inductance being larger than a fourth inductance and smaller than a fifth inductance, the fourth inductance being an inductance of the coil in the third use condition, the fifth inductance being an inductance of the coil in the fourth use condition.

11. The coil unit according to claim 9,

the first equivalent resistance being larger than the fourth equivalent resistance and smaller than the fifth equivalent resistance.

12. An electronic apparatus, comprising

the coil unit according to claim 1.

13-20. -20. (canceled)