ELECTRONIC DEVICE

• US 20090085708A1
• Filed: 09/26/2008
• Published: 04/02/2009
• Est. Priority Date: 09/28/2007
• Status: Abandoned Application

• Current Assignee: Fujitsu Limited, Fujitsu Media Devices Limited (Fujitsu Limited)
• Original Assignee: Fujitsu Limited, Fujitsu Media Devices Limited (Fujitsu Limited)
• Inventors: Mi, Xiaoyu, Ueda, Satoshi, Takahashi, Takeo, MATSUMOTO, Tsuyoshi
• Application Number:
  US12/238,764
• Publication Number:
  US 20090085708A1
• Time in Patent Office: Days
• US Class Current: 336/200
• CPC Class Codes: H01F 17/0013 with stacked layers

Abstract

An electronic device includes a substrate, two ellipse spiral coils that are provided on the substrate, are spaced from each other in a longitudinal direction thereof, and are electrically connected to each other, two wires that are electrically connected to outermost circumference of the two coils respectively and extract the two coils to outside, and a connection portion that electrically connects each end of innermost circumference of the two coils. A ratio of inner diameter against outer diameter of the two coils in a long axis direction and in a short axis direction thereof is respectively 0.5 to 0.8.

Claims

1. An electronic device comprising:

a substrate;

two ellipse spiral coils that are provided on the substrate, are spaced from each other in a longitudinal direction thereof, and are electrically connected to each other;

two wires that are electrically connected to outermost circumference of the two ellipse spiral coils respectively and extract the two ellipse spiral coils to outside; and

a connection portion that electrically connects each end of innermost circumference of the two ellipse spiral coils,

wherein a ratio of inner diameter against outer diameter of the two ellipse spiral coils in a long axis direction and in a short axis direction thereof is respectively 0.5 to 0.8.

2. The electronic device as claimed in claim 1, wherein there is air between the two ellipse spiral coils.

3. The electronic device as claimed in claim 1, wherein electrical current flows in the same direction in the two ellipse spiral coils.

4. The electronic device as claimed in claim 1, wherein the two ellipse spiral coils have circular spiral shape.

5. The electronic device as claimed in claim 1, wherein the two ellipse spiral coils have thickness of 3 μ

m to 30 μ

m.

6. The electronic device as claimed in claim 1, wherein an interval between the two ellipse spiral coils is 3 μ

m to 40 μ

m.

7. An electronic device comprising:

a substrate;

two polygonal spiral coils that are provided on the substrate, are spaced from each other in a longitudinal direction thereof, and are electrically connected to each other;

two wires that are electrically connected to outermost circumference of the two polygonal spiral coils respectively and extract the two polygonal spiral coils to outside; and

a connection portion that electrically connects each end of innermost circumference of the two polygonal spiral coils,

wherein a ratio of inner diameter against outer diameter of the two polygonal spiral coils in a long axis direction and in a short axis direction of an ellipse circumscribed to the outer circumference and the inner circumference of the two polygonal spiral coils is respectively 0.5 to 0.8.

8. The electronic device as claimed in claim 7, wherein there is a space between the two polygonal spiral coils.

9. The electronic device as claimed in claim 7, wherein electrical current flows in the same direction in the two polygonal spiral coils.

10. The electronic device as claimed in claim 7, wherein the two polygonal spiral coils have circular spiral shape.

11. The electronic device as claimed in claim 7, wherein the two polygonal spiral coils have thickness of 3 μ

m to 30 μ

m.

12. The electronic device as claimed in claim 7, wherein an interval between the two polygonal spiral coils is 3 μ

m to 40 μ

m.