# US 5,705,108 A · Method for making edge for loudspeaker diaphragm

> Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt

- Number: US 5,705,108 A
- Document ID: US5705108A
- Status: Granted
- Kind: A
- Application number: 08/670,422
- Filed: 1996-06-26
- Granted: 1998-01-06
- Earliest claimed: 1996-06-26
- Assignees: Foster Electric Company, Limited
- Inventors: Akihiro Nonogaki
- Web page: https://patentgrep.com/patent/US5705108A

## CPC

- B29C 70/76: Moulding on edges or extremities of the preformed part
- B29C 43/18: incorporating preformed parts or layers, e.g. compression moulding around inserts or for coating articles {(B29C43/206 takes precedence)}
- B29C 44/1271: {the preformed parts being partially covered}
- H04R 7/20: Securing diaphragm or cone resiliently to support by flexible material, springs, cords, or strands
- B29K 2021/00: Use of unspecified rubbers as moulding material
- B29K 2105/04: cellular or porous
- H04R 2231/003: Manufacturing aspects of the outer suspension of loudspeaker or microphone diaphragms or of their connecting aspects to said diaphragms
- B29C: SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING (making preforms B29B11/00; making laminated products by combining previously unconnected layers which become one product whose layers will remain together B32B37/00 - B32B41/00)
- 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)
- B29K: INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR {MOULDS, } REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS

## Abstract

An edge for loudspeaker diaphragm is made by disposing a diaphragm one of a pair of mating molds, disposing a strip-shaped base material of the edge on the said one of the molds, and hot-molding them with the other mold mated with the one mold. Foaming action of the base material occurs, and an eventual foamed edge is integralized with the diaphragm.

## Claims

### Claim 1

A method for making an edge for a loudspeaker diaphragm, comprising:
disposing a premanufactured diaphragm on one of a pair of mating molds respectively including male and female edge-forming portions that form a predetermined edge shape upon mating,
disposing a strip-shaped base material comprising a mixture of rubber as a main component and a foaming agent on the edge-forming portion of one of said mating molds, and
mating said pair of molds to hot-mold said strip-shaped base material into a foamed edge with said predetermined edge shape and simultaneously integrating said foamed edge with said diaphragm.

### Claim 2 (depends on 1)

The method according to claim 1, wherein said rubber is selected from the group consisting of vulcanized rubber and thermoplastic elastomer.

### Claim 3 (depends on 2)

The method according to claim 2, wherein said thermoplastic elastomer is selected from the group consisting of polystyrenes, polyolefins, polyurethanes, polyesters, polyamides, polybutadienes, ethylene-vinyl acetates, and polyvinyl chlorides.

### Claim 4 (depends on 1)

The method of claim 1 further comprising adhering a gasket to the foamed edge.

### Claim 5 (depends on 1)

The method of claim 1, wherein said foamed edge comprises a damping structure.

### Claim 6 (depends on 1)

The method of claim 1, wherein said foamed edge comprises circumferentially separated damping structures.