COIL UNIT AND ELECTRONIC APPARATUS USING THE SAME

• US 20090284341A1
• Filed: 04/24/2009
• Published: 11/19/2009
• Est. Priority Date: 05/14/2008
• Status: Active Grant

• Current Assignee: 138 East LCD Advancements Limited (Vector Capital Corporation)
• Original Assignee: Seiko Epson Corporation (Seiko Group)
• Inventors: Kondo, Yoichiro, Okada, Hirofumi
• Granted Patent: US 8,188,826 B2
• Time in Patent Office: Days
• US Class Current: 336/232
• CPC Class Codes: H01F 17/0006 Printed inductances printed coils for dynamo-electric machines H02K3/26; printed circuits H05K
• CPC Class Codes: H01F 2038/143 for signals
• CPC Class Codes: H01F 38/14 Inductive couplings for wireless supply or distribution of electric power using inductive coupling H02J50/10
• CPC Class Codes: H04B 1/3883 Arrangements for mounting batteries or battery chargers

Abstract

A coil unit includes a coil formed by winding a coil wire, a wiring substrate, and a magnetic substance for receiving magnetic lines of force generated by the coil. The wiring substrate includes a connection terminal connected to both ends of the coil, an external connection terminal, and a wiring pattern for connecting the connection terminal and the external connection terminal. No circuit element other than the coil is mounted on the wiring substrate.

Claims

1. A coil unit, comprising:

a coil formed by winding a coil wire;

a wiring substrate including;

a connection terminal connected to both ends of the coil;

an external connection terminal; and

a wiring pattern for connecting the connection terminal and the external connection terminal; and

a magnetic substance for receiving magnetic lines of force generated by the coil, wherein

no circuit element other than the coil being mounted on the wiring substrate.

2. The coil unit according to claim 1,

the coil being a flat coil.

3. The coil unit according to claim 2,

the wiring substrate has a coil housing, and the coil being housed in the coil housing.

4. The coil unit according to claim 2,

the coil being an air-core coil formed by winding the coil wire on a plane in a spiral fashion, and

if one surface of the coil is referred to as a transmission surface and the other surface of the coil is referred to as a non-transmission surface, an inner end of the coil being drawn from the non-transmission surface of the coil.

5. The coil unit according to claim 4, further comprising

a spacer disposed between the non-transmission surface of the coil and the magnetic substance.

6. The coil unit according to claim 1,

the magnetic substance being a multilayer body where a plurality of magnetic substances are layered.

7. The coil unit according to claim 1,

the magnetic substance being a multilayer body where first and second magnetic substances having different magnetic permeabilities are layered.

8. The coil unit according to claim 7, wherein

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

9. The coil unit according to claim 8,

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

10. The coil unit according to claim 9,

the first magnetic substance being disposed between the coil wire and the second magnetic substance.

11. The coil unit according to claim 1, further comprising:

a temperature detection element; and

a flexible substrate on which the temperature detection element being mounted, the flexible substrate being connected to the wiring substrate, wherein

the flexible substrate being interposed between the coil wire and the magnetic substance.

12. An electronic apparatus comprising:

an insertion part into which the coil unit according to claim 1 is to be inserted; and

a main body terminal to be connected to the external connection terminal of the coil unit.