Coil component

• US 20080129439A1
• Filed: 11/02/2007
• Published: 06/05/2008
• Est. Priority Date: 11/30/2006
• Status: Active Grant

• Current Assignee: TDK Corporation
• Original Assignee: TDK Corporation
• Inventors: Ito, Tomokazu, Yoshida, Makoto, Nishikawa, Tomonaga, Kamiyama, Hiroshi
• Granted Patent: US 7,508,292 B2
• Time in Patent Office: Days
• US Class Current: 336/232
• CPC Class Codes: H01F 17/0013 with stacked layers
• CPC Class Codes: H01F 2017/002 Details of via holes for interconnecting the layers
• CPC Class Codes: H01F 2017/0093 Common mode choke coil
• CPC Class Codes: H01F 27/323 Insulation between winding turns, between winding layers
• CPC Class Codes: H03H 2001/0092 Inductor filters, i.e. inductors whose parasitic capacitance is of relevance to consider it as filter

Abstract

The invention relates to surface-mount type coil components having a mounting surface for mounting them on a printed circuit board or hybrid IC (HIC) and provides a coil component having high electrical characteristics. A common mode filter includes a coil conductor formed in a spiral shape, cut ends which are parts of the coil conductor cut to face each other, and bridge conductors formed so that an insulation film is interposed between the coil conductor and the same to connect the cut ends to each other.

Claims

1. A coil component comprising:

a first coil conductor formed in a spiral shape;

first cut ends which are parts of the first coil conductor cut to face each other; and

a first connecting conductor formed so that an insulation film is interposed between the first coil conductor and the same to connect the first cut ends to each other.

2. The coil component according to claim 1, wherein a width of an inner circumferential end of the first coil conductor is equal to or smaller than a width of the first coil conductor.

3. The coil component according to claim 1, further comprising a first lead-out electrode formed in the same layer as the first coil conductor formed therein and extend from the inner circumferential end of the first coil conductor through a gap between the first cut ends up to the outside of the first coil conductor.

4. The coil component according to claim 3, wherein the first lead-out conductor extends in the form of a straight line.

5. The coil component according to claim 1, further comprising a magnetic layer formed inside the first coil conductor.

6. The coil component according to claim 1, further comprising:

a second coil conductor formed in a spiral shape and disposed opposite to the first coil conductor;

second cut ends which are parts of the second coil conductor cut to face each other; and

a second connecting conductor formed so that an insulation film is interposed between the second coil conductor and the same to connect the second cut ends to each other.

7. The coil component according to claim 6, wherein the second connecting conductor is formed in the same layer as the first connecting conductor formed therein and the first and the second connecting conductors are formed between the first and the second coil conductors.