# US 5,708,721 A · Coil assemblies

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- Number: US 5,708,721 A
- Document ID: US5708721A
- Status: Granted
- Kind: A
- Application number: 08/756,277
- Filed: 1996-11-25
- Granted: 1998-01-13
- Earliest claimed: 1989-12-21
- Assignees: Knowles Electronics, LLC
- Inventors: Richard James Salvage; Steven John Harrington; Derek William Powell
- Web page: https://patentgrep.com/patent/US5708721A

## CPC

- H04R 1/06: Arranging circuit leads; Relieving strain on circuit leads
- H01F 27/027: {specially adapted for combination of signal type inductors or transformers with electronic circuits, e.g. mounting on printed circuit boards}
- H01F 27/292: {Surface mounted devices}
- H04R 11/02: Loudspeakers
- H04R 25/00: Electric hearing aids
- H04R: LOUDSPEAKERS, MICROPHONES, GRAMOPHONE PICK-UPS OR LIKE ACOUSTIC ELECTROMECHANICAL TRANSDUCERS; ELECTRIC HEARING AIDS; PUBLIC ADDRESS SYSTEMS (producing sounds with frequency not determined by supply frequency G10K)
- H01F: MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES

## Abstract

This invention relates to coil assemblies and in particular, but not exclusively, to such assemblies for acoustic transducers. Thus a transducer 10 includes a case 11 in which is located a coil 16 mounted on a flexi-circuit, which locates the coil 16 for its assembly handling and which allows various configurations within the case 11. A method of winding the coil 16 and mounting it on the carrier 17 is also described.

## Claims

### Claim 1

A hearing aid transducer comprising:
a coil assembly including a fine wire coil having a body and a set of leads and a flexible carrier incorporating electrical paths extending from a first set of terminals to a second set of terminals; the coil body being directly mounted by means of an adhesive on the carrier and the leads being electrically connected to the first set of terminals; and
a case having a slot through which the carrier extends such that the second set of terminals are external to the case.

### Claim 2 (depends on 1)

A hearing aid transducer as claimed in claim 1, wherein the carrier extends above or below the coil.

### Claim 3 (depends on 1)

A hearing aid transducer as claimed in claim 1, wherein the carrier is dimensioned to locate the coil within the case.

### Claim 4 (depends on 1)

A hearing aid transducer as claimed in claim 1, wherein the coil is formerless.