Miniaturized printed circuit and coil assembly

• US 5,606,488 A
• Filed: 09/23/1992
• Issued: 02/25/1997
• Est. Priority Date: 04/19/1990
• Status: Expired due to Term

• Current Assignee: Assa Abloy AB
• Original Assignee: Sokymat
• Inventors: Gustafson, Ake
• Primary Examiner(s): SPARKS, DONALD ALAN
• Application Number:
  US07/948,587
• Time in Patent Office: 1,616 Days
• Field of Search: 340/573, 340/825, 340/825.31, 340/825.32, 342/51, 342/572, 342/573, 235/487, 235/488, 235/492, 235/380, 235/382, 235/493, 235/494, 361/760, 361/728, 361/733, 361/743, 361/745, 361/767, 361/772, 361/779, 361/807, 361/808, 361/809, 361/813, 361/684, 361/737, 361/748, 361/761, 361/763, 361/777, 361/782 , 361/811, 361/821, 336/198, 336/200, 336/208, 336/221, 333/24 R, 333/246, 333/247, 343/744, 343/866, 343/868, 343/867, 343/872, 343/873, 343/895, 379/91, 379/112, 156/53
• US Class Current: 361/782
• 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 19/0775 arrangements for connecting the integrated circuit to the antenna
• 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: H01F 41/074 Winding flat coils
• CPC Class Codes: H01F 41/10 Connecting leads to windings making electric connections in general H01R43/00
• CPC Class Codes: H05K 1/181 associated with surface mounted components
• CPC Class Codes: Y10T 29/49071 by winding or coiling
• CPC Class Codes: Y10T 29/49162 by using wire as conductive path

Abstract

The process for assembly of a coil with or without a core on a printed circuit comprises placing the printed circuit in the winding machine before starting the winding. When the Flyer brings the wire for the winding, it causes the latter to pass over a metallized path of the printed circuit while keeping said wire taut. After the Flyer has effected the number of turns necessary for the winding, it will carry the wire along, passing onto a second metallized path, always keeping it taut. The soldering of the two end wires of the winding on the respective metallized paths will take place very easily since each of said wires is held taut at the location where the soldering is to take place. This process permits automating the production of miniaturized electronic circuits comprising a winding.

Claims

1. A miniaturized transponder device, comprising:

a printed circuit board having two metallized surfaces;

at least one electronic component physically attached to the printed circuit board and electrically connected to first portions of the metallized surfaces; and

a coil of wire physically attached to the printed circuit board so that second portions of the metallized surfaces extend beyond an outer lateral side of the coil and a portion of the coil is positioned laterally away from the printed circuit board, wherein both ends of the coil of wire remain beyond the outer lateral side of the coil after winding of the coil and in close proximity to the corresponding second portions of the metallized surfaces after winding of the coil and assembly of the coil to the printed circuit board, the ends of the coil of wire being securely electrically connected to said second portions of the metallized surfaces beyond the outer lateral side of the coil before the coil is separated from the wire.

2. The miniaturized transponder device of claim 1, wherein the wire is approximately one hundred microns in diameter or less.

3. The miniaturized transponder device of claim 1, wherein the transponder device is incorporated into an intelligent credit card.

4. The miniaturized transponder device of claim 1, further comprising material encapsulating at least the electronic component and said first portions of the metallized paths with the second portions of the metallized paths protruding therefrom.

5. The miniaturized transponder device of claim 1, wherein the coil is formed from a wire positioned adjacent to the printed circuit board as the coil is wound, at least one end of the wire remaining in close proximity to a corresponding one of the second portions of the metallized paths during winding of the coil.

6. A miniaturized transponder device, comprising:

a printed circuit having two metallized paths;

at least one electronic component physically attached to the printed circuit and electrically connected to first portions of the metallized paths;

a coil of wire physically attached to the printed circuit, ends of the wire being electrically connected to second portions of the metallized paths; and

a core formed of synthetic material and comprising a cylindrical barrel, a front flange formed on a first end of the barrel and a rear flange formed on a second end of the barrel, the wire being wound on the barrel;

wherein the second portions of the metallized paths extend to an outer lateral side of the barrel and a portion of the barrel is positioned laterally away from the printed circuit, the ends of the wire being securely electrically connected to said second portions of the metallized paths on the outer lateral side of the barrel before the coil is separated from the wire.

7. The miniaturized transponder device of claim 6, wherein the front flange is concentric to the cylindrical barrel, and the rear flange is eccentric to the cylindrical barrel and the front flange.

8. The miniaturized transponder device of claim 6, wherein the rear flange of the core is physically attached to the printed circuit.

9. The miniaturized transponder device of claim 6, further comprising material encapsulating at least the electronic component and said first portions of the metallized paths with the second portions of the metallized paths protruding therefrom.

10. A miniaturized transponder device, comprising:

a printed circuit having two metallized paths;

at least one electronic component physically attached to the printed circuit and electrically connected to first portions of the metallized paths;

a coil of wire physically attached to the printed circuit, ends of the wire being electrically connected to second portions of the metallized paths; and

a core formed of synthetic material and comprising a cylindrical barrel, a front flange formed on a first end of the barrel and a rear flange formed on a second end of the barrel, the wire being wound on the barrel and the rear flange of the core being physically attached to the printed circuit;

wherein the core further comprises a pair of notches provided in the rear flange, such that when the rear flange is attached to the printed circuit, the pair of metallized paths remain accessible for attaching the wire ends thereto.

11. The miniaturized transponder device of claim 10, wherein the core further comprises a plurality of pins provided on an outer surface of the rear flange, and the printed circuit further comprises a plurality of holes formed in said second portions of the metallized paths, the core being physically attached to the printed circuit by inserting the plurality of pins into the plurality of holes.

12. The miniaturized transponder device of claim 10, further comprising material encapsulating at least the electronic component and said first portions of the metallized paths with the second portions of the metallized paths protruding therefrom.