Chip inductor

• US 4,755,784 A
• Filed: 06/30/1986
• Issued: 07/05/1988
• Est. Priority Date: 07/02/1985
• Status: Expired due to Term

• Current Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Original Assignee: Matsushita Electric Industrial Company Limited (Panasonic Holdings Corporation)
• Inventors: Otake, Hiroshi, Arima, Hironori, Yamamoto, Hiromasa, Taoka, Mikio
• Primary Examiner(s): Echols, P. W.
• Application Number:
  US06/879,889
• Time in Patent Office: 736 Days
• Field of Search: 336/192, 336/65, 336/96, 29/605, 29/854, 29/855, 29/856
• US Class Current: 336/96
• CPC Class Codes: H01F 2017/048 with encapsulating core, e.g. made of resin and magnetic powder
• CPC Class Codes: H01F 27/292 Surface mounted devices
• CPC Class Codes: H01F 41/10 Connecting leads to windings making electric connections in general H01R43/00
• CPC Class Codes: Y10T 29/49071 by winding or coiling
• CPC Class Codes: Y10T 29/49171 with encapsulating

Abstract

A leadless chip inductor having metallic terminal plates and a coil element fixed to the metallic terminal plates, the metallic terminal plates being partially enclosed, together with the coil element, by a resin molded cover, the portions of the metallic terminal plates exposed to the outside of the molded outer cover being bent along the edge of the molded cover so as to form terminals for connection to an external circuit. The mechanical and electrical connection between the metallic terminal plates and the lead lines led from the coil is achieved by brazing or welding the lead lines to the undersides of a narrow strip-shaped tabs which is projected from each metallic terminal plate. With this arrangement, the coil lead lines are securely connected to the metallic terminal plates.

Claims

1. A chip inductor having opposing metallic terminal plates, a coil element connected to said metallic terminal plates, and a molded cover partially enclosing said metallic terminal plates and fully enclosing said coil element, portions of said metallic terminal plates exposed to the outside of said molded cover being bent along the edges of said molded cover, wherein the improvement comprises narrow strip-shaped tabs projected from respective metallic terminal plates, said coil element being fixed to the upper surfaces of opposing ends of said pair of metallic terminal plates so as to bridge the plates, coil lead lines extending from said coil element being connected to said metallic terminal plates by being fixed to the undersides of said tabs, wherein each of said tabs is provided with a notch which receives and catches said coil lead line which is to be laid on and fixed to the underside of said tab.

2. A chip inductor according to claim 1, wherein the opposing ends of said pair of metallic terminal plates are bent in such a manner as to form a recess which conforms with the shape of said coil element, and said coil element is seated and fixed in said recess.

3. A chip inductor according to claim 1, wherein each of said coil lead lines in wound one to several times around said tab before it is fixed to the underside of said tab.

4. A chip inductor, comprising:

a pair of opposing metallic terminal plates,

a coil element fixed to upper surfaces of opposing ends of said pair of metallic terminal plates so as to bridge said metallic terminal plates,

a plurality of tabs each having a narrower width than the width of said opposing ends of said metallic terminal plates and including concave-shaped notches,

coil lead lines extending from said coil element and engaging said concave-shaped notches, said coil lead lines being fixed to said metallic terminal plates and extending along undersides of said tabs, said coil lead lines being electrically connected to said metallic terminal plates at said undersides of said tabs, and

a molded cover fully enclosing said coil element and said tabs and partially enclosing said metallic terminal plates, portions of said metallic terminal plates being exposed to the outside of said molded cover to provide terminals for electrically connecting said coil element to external circuits.