US4880591A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for manufacturing speaker vibration member
Assignee: Mitsubishi Electric Corp
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Filing: 1988-04-05
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Granted: 1989-11-14
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Expires: 2008-04-05
Abstract
Abstract A speaker vibration member is made by melting materials containing no less than 10% of a thermoplastic liquid crystal polymer and 3 to 40% of fiber or flake filled by weight, allowing the mixture to flow, cooling the mixture, and solidifying it.
Inventors
- 👤 Fumiaki Baba
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:24
CPC Classifications
H; H04; H04R; H04R31/00; H04R31/003; B; B29; B29C; B29C35/00; B29C35/16; B29C45/00; B29C45/0005; B29C45/0013; B29C70/00; B29C70/02; B29C70/021; B29C70/025; B29C70/58; B29C70/62; B29K; B29K2105/00; B29K2105/0079; B29K2105/06; B29K2105/12; B29K2105/16; B29K2995/00; B29K2995/0037; B29K2995/0046; B29L; B29L2031/00; B29L2031/34; B29L2031/3418
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
171 words
A method for manufacturing a speaker vibration member in a molding process, said method comprising: a first step of preparing a mixture of materials for forming said speaker member, said mixture of materials containing no less than 10% by weight of liquid crystal polymer and 3 to 40% by weight of fiber or flake filler, a second step of melting the mixture of liquid crystal polymer and fiber or flake filler materials, a third step of introducing the mixture into a mold, said mold being maintained at a lower temperature than a solidified temperature of said mixture of materials, and a fourth step of cooling and solidifying the melted mixture materials as the mixture flows in said mold which is adjusted at said lower temperature than the solidification temperature of the materials so that orientation of the mixture materials in the center layers of said molded speaker vibration member is increased for increasing the elasticity coefficient of said vibration member by increasing the shear flow rate and decreasing the mold temperature.
Claim 2
Independent Claim
171 words
A method for manufacturing a speaker vibration member in a molding process, said method comprising: a first step of preparing a mixture of materials for forming said speaker member, said mixture of materials containing no less than 10% by weight of liquid crystal polymer and 3 to 40% by weight of fiber or flake filler, a second step of melting the mixture of liquid crystal polymer and fiber or flake filler materials, a third step of introducing the mixture into a mold, said mold being maintained at a lower temperature than a solidified temperature of said mixture of materials, and a fourth step of cooling and solidifying the melted mixture materials as the mixture flows in said mold which is adjusted at said lower temperature than the solidification temperature of the materials so that orientation of the mixture materials in the center layers of said molded speaker vibration member is increased for increasing the elasticity coefficient of said vibration member by increasing the shear flow rate and decreasing the mold temperature.
Claim 3
Dependent Claim
26 words
A method as described in claim 1, wherein said filler consists of at least one of glass fiber, carbon fiber, wollastonite, talc, mica, and glass flakes.
Claim 4
Dependent Claim
14 words
A method as described in claim 1, wherein said filler is carbon graphite flake.
Claim 5
Dependent Claim
21 words
A method as described in claim 3, wherein carbon graphite is present to the extent of 5 to 25% by weight.
Claim 6
Dependent Claim
24 words
A method as described in claim 1, wherein said mixture materials contain a thermoplastic liquid crystal polymer, a flake filler, and a thermoplastic resin.
Claim 7
Dependent Claim
21 words
A method as described in claim 1, wherein said mixture materials are molded into the speaker vibration member by injection molding.
Claim 8
Dependent Claim
19 words
A method as described in claim 6, wherein said mixture materials are injected from the center of the mold.
References Cited (Backward Citations)
US3907952A
Cited
US3894823A
Cited
US4404161A
Cited
US4490326A
Cited
US4560342A
Cited
US4728698A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-11-13 | 1993-05-15 | 1993-11-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-11-13 | 1997-05-15 | 1997-11-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-11-13 | 2001-05-15 | 2001-11-14 | $7700.00 | Window Closed / Lapsed |