Inductor and method of manufacturing same

• US 6,275,132 B1
• Filed: 10/13/1998
• Issued: 08/14/2001
• Est. Priority Date: 10/24/1997
• Status: Expired due to Fees

• Current Assignee: Murata Manufacturing Co Limited
• Original Assignee: Murata Manufacturing Co Limited
• Inventors: Yamamoto, Takahiro, Oshima, Hisato, Shikama, Takashi, Sugitani, Masami
• Primary Examiner(s): Donovan, Lincoln
• Assistant Examiner(s): Nguyen, Tuyen T.
• Application Number:
  US09/170,783
• Time in Patent Office: 1,036 Days
• Field of Search: 336/200, 336/83, 336/232, 336/223, 336/65, 336/96, 296/021, 296/05--09, 257/531
• US Class Current: 336/83
• CPC Class Codes: H01F 27/29 Terminals; Tapping arrangements for signal inductances
• CPC Class Codes: H01F 37/00 Fixed inductances not covered by group H01F17/00
• CPC Class Codes: Y10T 29/4902 Electromagnet, transformer or inductor

Abstract

An inductor includes a coiled metal wire, an insulating molded member in which the coiled metal wire is embedded, and metal caps fitted on both ends of the insulating molded member. The metal caps are welded to both ends of the coiled metal wire. Between the metal caps and the end surfaces of the insulating molded member, spaces are defined respectively. The insulating molded member is made of, for example, resin or rubber.

Claims

1. An inductor, comprising:

an insulating molded member having magnetic powders disposed therein;

a coiled metal wire embedded in said insulating molded member; and

metal caps fitted on both ends of said insulating molded member;

wherein said metal caps are electrically connected to both ends of said coiled metal wire and spaces are provided between end surfaces of said insulating molded member and said metal caps such that said metal caps are not in contact with said end surfaces of said insulating molded member.

2. An inductor according to claim 1, wherein said insulating molded member is made of at least a resin material or a rubber material.

3. An inductor according to claim 1, wherein said spaces are provided between said metal caps and said insulating molded member such that a difference of thermal expansion between said insulating molded member and said metal caps is absorbed by said spaces.

4. An inductor according to claim 1, wherein said spaces are formed between said metal caps and said insulating molded member by heat generated by welding operation to be performed on said inductor which melts and contracts said insulating molded member and said end surfaces of said insulating molded member retreat from said metal caps.

5. An inductor according to claim 1, wherein both ends of said coiled metal wire are projected from the end surfaces of said insulating molded member.

6. An inductor according to claim 1, wherein each of said metal caps includes upper and lower segments and a side segment interconnecting said upper and lower segments.

7. An inductor according to claim 6, wherein said upper and lower segments of each of said metal caps are disposed in contact with said insulated molded member and said side segment of each of said metal caps is spaced from said insulated molded member.

8. An inductor according to claim 7, wherein both ends of said coiled metal wire are projected from a respective one of the end surfaces of said insulated member and are electrically and physically connected to said side segment of a respective one of said end caps.

9. An inductor, comprising:

an insulating molded member;

a coiled metal wire embedded in said insulating molded member; and

metal electrodes disposed on opposite end surfaces of said insulating molded member;

wherein said metal electrodes are electrically connected to both ends of said coiled metal wire and said opposite end surfaces of said insulating molded member are spaced from said metal electrodes such that said metal electrodes are not in contact with said opposite end surfaces of said insulating molded member.

10. An inductor according to claim 9, wherein said insulating molded member includes magnetic powders mixed therein.

11. An inductor according to claim 9, wherein said metal electrodes comprise metal caps.

12. An inductor according to claim 9, wherein said insulating molded member is made of at least a resin material or a rubber material.

13. An inductor according to claim 9, wherein spaces are provided between said metal electrodes and said insulating molded member such that a difference of thermal expansion between said insulating molded member and said metal electrodes is absorbed by said spaces.

14. An inductor according to claim 9, wherein said spaces are formed between said metal electrodes and said insulating molded member by heat generated by a welding operation to be performed on said inductor which melts and contracts said insulating molded member and said opposite end surfaces of said insulating molded member retreat from said metal electrodes.

15. An inductor according to claim 9, wherein both ends of said coiled metal wire are projected from the opposite end surfaces of said insulating molded member.

16. An inductor according to claim 9, wherein each of said metal electrodes includes upper and lower segments and a side segment interconnecting said upper and lower segments.

17. An inductor according to claim 16, wherein said upper and lower segments of each of said metal electrodes are disposed in contact with said insulated molded member and said side segment of each of said metal electrodes is spaced from said insulated molded member.

18. An inductor according to claim 17, wherein both ends of said coiled metal wire are projected from a respective one of the end surfaces of said insulated member and are electrically and physically connected to said side segment of a respective one of said metal terminals.