Air coil and method of making the same

• US 5,592,150 A
• Filed: 10/27/1994
• Issued: 01/07/1997
• Est. Priority Date: 10/27/1994
• Status: Expired due to Fees

• Current Assignee: Texas Instruments, Inc.
• Original Assignee: Texas Instruments, Inc.
• Inventors: D'Hont, Loek J.
• Primary Examiner(s): MULLEN, THOMAS J
• Application Number:
  US08/330,038
• Time in Patent Office: 803 Days
• Field of Search: 340/572, 342/44, 342/42, 342/51, 343/866, 343/895, 235/492, 29/825, 29/33 R, 29/600, 29/601, 336/170-171
• US Class Current: 340/572.7
• CPC Class Codes: G06K 19/07718 the record carrier being manufactured in a continuous process, e.g. using endless rolls
• CPC Class Codes: G06K 19/07749 the record carrier being capable of non-contact communication, e.g. constructional details of the antenna of a non-contact smart card
• CPC Class Codes: G06K 19/07779 the inductive antenna being a coil
• CPC Class Codes: G06K 19/07781 the coil being fabricated in a winding process
• CPC Class Codes: G08B 13/244 Tag manufacturing, e.g. continuous manufacturing processes
• CPC Class Codes: H01F 30/08 without magnetic core
• CPC Class Codes: H01F 41/043 by thick film techniques
• CPC Class Codes: H01F 5/00 Coils superconducting coils H01F6/06; fixed inductances of the signal type H01F17/00
• CPC Class Codes: Y10T 29/49016 Antenna or wave energy "plumbing" making

Abstract

In one aspect, the present invention provides an air coil 20. The air coil 20 may be made from a strip of electrically conductive material 22 which has an insulating material overlying it. For example, the conductive material may comprise copper. The strip 22 is wound into a coil to perform a plurality of windings. The insulating material electrically insulates each of the winding from adjacent ones of the windings.

Claims

1. A method of making an air coil comprising the steps of:

providing a sheet of conductive material;

disposing an insulating material adjacent said sheet of conductive material;

cutting said sheets of conductive material and insulating material into a plurality of strips; and

winding each strip into an air coil such that each air coil comprises a plurality of windings wherein said insulating material electrically insulates each of said windings from adjacent ones of said windings.

2. The method of claim 1 wherein said step of disposing an insulating material adjacent said sheet of said conductive material comprises coating said conductive material with a lacquer.

3. The method of claim 2 and further comprising the step of heating at least one of said air coils such that said lacquer melts thereby passivating the coil into a fixed self supporting component.

4. The method of claim 3 wherein at least one of said air coils is heated by blowing hot air on said air coil.

5. The method of claim 3 wherein at least one of said air coils is heated by causing a current to flow through said coil.

6. The method of claim 1 wherein said step of disposing an insulating material adjacent said sheet of conductive material comprises pressing a sheet of insulating material against said sheet of conductive material.

7. The method of claim 1 wherein said step of cutting said sheets of conductive material and insulating material comprises cutting said insulating material such that strips of said insulating material are wider than strips of said strips of said conductive material.

8. The method of claim 7 and further comprising the step of heating at least one of said air coils such that said strip of insulating material of said at least one air coil passivates said at least one air coil.

9. The method of claim 1 wherein said step of providing a sheet of conductive material comprises providing a sheet of copper.

10. An air coil formed from a method comprising the steps of:

providing a sheet of conductive material;

disposing an insulating material adjacent said sheet of conductive material;

cutting said sheet of conductive material and said adjacent insulating material into a plurality of strips; and

winding one of said strips into said air coil such that said air coil comprises a plurality of windings wherein said insulating material electrically insulates each of said windings from adjacent ones of said windings.

11. An apparatus for use in making an air coil, said apparatus comprising:

a first spool for storing a sheet of electrically conductive material;

a cutting apparatus for cutting said sheet of electrically conductive material and an insulating material into a plurality of ribbon-like strips; and

a winding apparatus for winding each strip into an air coil such that each air coil comprises a plurality of windings wherein said insulating material electrically insulates each of said windings from adjacent ones of said windings.

12. The apparatus of claim 11 wherein said sheet of electrically conductive material has a lacquer coating formed thereon such that said insulating material comprises said lacquer coating.

13. The apparatus of claim 11 and further comprising means for heating each of said air coils.

14. The apparatus of claim 11 and further comprising:

a second spool for storing a sheet of said insulating material; and

a pinch roller for guiding said sheet of electrically conductive material into a closely adjacent position with said sheet of insulating material.