Wire-wound type chip coil and method of adjusting a characteristic thereof

• US 20050146409A1
• Filed: 02/18/2005
• Published: 07/07/2005
• Est. Priority Date: 08/09/2001
• Status: Active Grant

• Current Assignee: Murata Manufacturing Co Limited
• Original Assignee: Murata Manufacturing Co Limited
• Inventors: Hirai, Shinya, Toi, Takaomi, Tsubana, Katsuhiko, Yasuzawa, Hiroyuki
• Granted Patent: US 7,373,715 B2
• Time in Patent Office: Days
• US Class Current: 336/83
• CPC Class Codes: H01F 17/045 with core of cylindric geometry and coil wound along its longitudinal axis, i.e. rod or drum core
• CPC Class Codes: H01F 27/292 Surface mounted devices
• CPC Class Codes: Y10T 29/4902 Electromagnet, transformer or inductor
• CPC Class Codes: Y10T 29/49071 by winding or coiling
• CPC Class Codes: Y10T 29/49073 by assembling coil and core
• CPC Class Codes: Y10T 29/49076 From comminuted material

Abstract

A wire-wound type chip coil can take various inductance values while maintaining its outer dimension at a specified fixed value. A chip coil is formed by winding at least two conductive wires regularly in a single layer around a core made of a magnetic material and firmly connecting both ends of each conductive wire to terminal electrodes disposed on respective flanges of the core. This makes it possible to obtain a great current capacity. Furthermore, the inductance decreases because of an increase in the magnetic path length. A great number of different inductance values can be easily obtained by properly selecting parameters including the number of substantially parallel conductive wires, the diameter of each conductive wire, and the number of turns.

Claims

1-10. -10. (canceled)

11. A method of adjusting a characteristic of a wire-wound type chip coil comprising the step of:

providing a wire-wound type chip coil including a core, flanges having a terminal electrode and respectively disposed on both ends of the core, a conductive wire wound around the core, both ends of the conductive wire being electrically connected to the respective terminal electrodes in parallel; and

adjusting the space between adjacent wires wound around the core so as to adjust the inductance between the terminal electrodes.

12. A method according to claim 11, wherein the step of adjusting the space between adjacent wires wound around the core includes the step of rotating a winding nozzle by a predetermined angle about a central axis thereof such that the conductive wires are extracted from the winding nozzle at a predetermined angle.

13. A method according to claim 11, wherein said at least two conductive wires are electrically connected to the respective terminal electrodes in parallel and wound regularly in a single layer around the core.

14. A method according to claim 11, wherein said at least two conductive wires are electrically connected to the respective terminal electrodes in parallel and are twisted together to form of a single strand, and the single strand of twisted conductive wires is wound around the core.

15. A method according to claim 11, wherein said at least two conductive wires are electrically connected to the respective terminal electrodes in parallel and are wound around the core such that said at least two conductive wires are spaced from each other.

16. A method according to claim 11, further comprising a coating resin disposed on an exterior of the core so as to cover the conductive wires wound around the core.

17. A method according to claim 11, wherein the core is made of a material having a relative magnetic permeability of about 1.

18. A method according to claim 11, wherein the terminal electrodes have a thickness of about 10 μ

m to about 30 μ

m.

19. A method according to claim 11, wherein the diameters of the at least two conductive wires are preferably within the range of about 20 μ

m to about 120 μ

m.

20. A method according to claim 11, wherein the diameters of the at least two conductive wires are different from each other.