Ferrite core structure for SMD and manufacturing method therefor

• US 6,680,664 B2
• Filed: 05/21/2002
• Issued: 01/20/2004
• Est. Priority Date: 05/21/2002
• Status: Expired due to Fees

• Current Assignee: Yun-Kuang Fan
• Original Assignee: Yun-Kuang Fan
• Inventors: Fan, Yun-Kuang
• Primary Examiner(s): Mai, Anh T
• Application Number:
  US10/151,145
• Publication Number:
  US 20030218526A1
• Time in Patent Office: 609 Days
• Field of Search: 336/65, 336/200, 336/192, 336/209, 336/210, 296/021
• 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
• CPC Class Codes: H01F 5/04 Arrangements of electric connections to coils, e.g. leads
• CPC Class Codes: Y10T 29/4902 Electromagnet, transformer or inductor

Abstract

A ferrite core structure and manufacturing method therefor comprise a ferrite core having gaps at both ends and located on fastening terminals, which are formed symmetrically, at both ends of the conductive bracket, and a pair of insulating seats being shaped at each end of the ferrite core column via the transfer molding technology, a conductive coil being wound on the portion of the ferrite core column which is not enclosed by the insulating seats while both ends of the coil is soldered. In this way, a coil type inductor element applied to a surface-mounted device (SMD) is got. According to the process of the present invention, not only the complicated process steps of commonly arts are simplified but also mass production is easier. Meanwhile, when the present invention is used, the configuration of space is more flexible.

Claims

1. A ferrite core structure for SMD, which comprises:

a ferrite core column, wherein a pair of gaps are set at each end portion of both sides;

a pair of conductive pieces, wherein a first end of said conductive pieces is a connecting terminal while a second end is extended and shaped to be formed a conductive terminal and a fastening terminal, said fastening terminal enabling to be inset into said gaps of said ferrite core column;

a pair of insulating seats, which are respectively enclosed at both ends of said ferrite core column, said conductive terminals, said connecting terminals of said conductive pieces and a holding part being revealed at a lateral side of said insulting seats;

a conductive coil being wound on said ferrite core column, both ends being respectively connected to said connecting terminals of said conductive pieces.

2. The ferrite core structure for SMD as recited in claim 1, wherein said connecting terminals are revealed and bended to be parallel to a surface of said insulating seats of said ferrite core structure symmetrically.

3. The ferrite core structure for SMD as recited in claim 1, wherein both ends of said core can be respectively connected to said conductive terminals of said conductive pieces.

4. The ferrite core structure for SMD as recited in claim 1, wherein said conductive terminal has a holding part used for positioning said conductive pieces accurately with respect to said ferrite core.

5. A manufacturing method of said ferrite core structure as recited in claim 1, which at least comprises following steps:

step1;

said connecting terminals of said conductive pieces at an end of a conducting bracket unit being inset into said gaps of said ferrite core column;

step2;

said pair of insulating seats are respectively shaped at both ends of said ferrite core column by a transfer molding process and only said conductive terminals, said connecting terminals of said conductive pieces and said holding part being revealed at said lateral side of said insulating seat

step3;

with a punching process, said ferrite core column enclosed by said insulating seat at both ends being punched to depart from said conducting bracket unit;

step4;

said conductive coil being wound on a portion of said ferrite core which is not enclosed by said insulating seats, and said two terminals of said conductive coil being connected to said connecting terminals of said two conductive pieces;

step5;

said two connecting terminals revealed at said insulating seats being bended to parallel to said surface of said insulating seats symmetrically.