Wound type common mode choke coil

• US 6,535,095 B2
• Filed: 04/18/2001
• Issued: 03/18/2003
• Est. Priority Date: 04/18/2000
• Status: Expired due to Fees

• Current Assignee: Taiyo Yuden Company Limited (Taiyo Yuden Co)
• Original Assignee: Taiyo Yuden Company Limited (Taiyo Yuden Co)
• Inventors: Aoki, Hidenori, Takayama, Manabu
• Primary Examiner(s): MAI, ANH T
• Application Number:
  US09/836,206
• Publication Number:
  US 20010038327A1
• Time in Patent Office: 699 Days
• Field of Search: 336/83, 336/200, 336/212, 336/90, 336/96, 336/223, 336/232
• 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 27/027 specially adapted for combination of signal type inductors or transformers with electronic circuits, e.g. mounting on printed circuit boards
• CPC Class Codes: H01F 27/292 Surface mounted devices

Abstract

A wound type common mode choke coil resulting in a tip shape finished product is provided, having a good appearance, high reliability, and excellent common mode characteristics, by reducing the profile of the common mode component. This wound type common mode choke coil has a magnetic core with square collar portions at both ends of a winding core, grooves in the square collars, first electrodes, a pair of coil conductors wound around the winding core portion connected conductively to the first electrode layers of the collar portions, a non-magnetic first insulation coating layer coating the outer circumference of the magnetic core, a second insulation coating layer containing magnetic power armor-coated to the whole outer circumference of the common mode choke coil, and second electrode layers coating from the groove portions over the first electrode layers. The groove portions prevent the excess resin produced during the sealing from flowing over and degrading other elements of the device by allowing drainage therethrough.

Claims

1. A wound type common mode choke coil, comprising:

a magnetic core having a square collar portion respectively at both ends of a winding core and a groove portion around the circumferential surface of each collar portion from said winding core side to the end face side of the collar portion;

a plurality of first electrode layers disposed respectively separately at least around the circumferential surface of each collar potion of said magnetic core;

a pair of coil conductors wound around the winding core portion of said magnetic core and whose respective terminals are conductively connected to said first electrode layer of said collar portion;

a non-magnetic first insulation coating layer disposed so as to integrally coat the outer circumference of the pair of coil conductors wound around the winding core portion of said magnetic core;

a second insulation coating layer armored to the whole outer circumference of said first insulation coating layer containing magnetic powder of said winding core portion, and disposed according to the square shape of the collar portion from a concave area between both collar portions to the groove portion of each collar portion of said magnetic core; and

a second electrode layer coating from the groove portion on which said second insulation coating layer of the circumferential surface of each collar portion of said magnetic core is disposed to said first electrode layer.

2. The wound type common mode choke coil according to claim 1, wherein the conductive connection portion of respective terminals of said pair of coil conductors and said first electrode layer is disposed in the groove portion on the circumferential surface of said collar portion.

3. The wound type common mode choke coil according to claim 2, wherein said first insulation coating layer coats from the outer circumference of the pair of coil conductors wound around the winding core portion of said magnetic core to the conductive connection portion of respective terminals of said coil conductors and said first electrode layer.

4. The wound type common mode choke coil according to claim 1, wherein said first insulation coating layer coats from the outer circumference of the pair of coil conductors wound around the winding core portion of said magnetic core to the conductive connection portion of respective terminals of said coil conductors and said first electrode layer.