Patent US4344503A successfully refreshed from Google Patents.
US4344503A
Expired / Lapsed
US
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Diaphragm for electro-acoustic transducer
Assignee: Nippon Gakki Co Ltd
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Filing: 1981-01-23
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Granted: 1982-08-17
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Expires: 2001-01-23
Abstract
Abstract A diaphragm for electro-acoustic transducer which, as a component member, utilizes a layer of ceramics material, by which the E/ρ ratio of the diaphragm can be increased, leading to an elevated resonance frequency of the diaphragm, whereby the limit frequency for reproducting of high-pitch sound can be shifted high, thus making it possible to widen the range of piston motion of the diaphragm, and to thereby improve its frequency characteristic. Also, a diaphragm utilizing a composite board formed by lamination of a layer of ceramics material and a layer of light-weight metal eliminates the fragility of diaphragm would entail when the diaphragm utilizes a single layer of a ceramics material alone, and thus the handling of the diaphragm is facilitated.
Inventors
- 👤 Akira Nakamura
- 👤 Takao Nakaya
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 15:22
CPC Classifications
H; H04; H04R; H04R7/00; H04R7/02; H04R7/04; H04R7/06; H04R7/10; H04R7/12; H04R7/122; H04R7/125; H04R7/127
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
75 words
A diaphragm for an electro-acoustic transducer, comprising: a core member; and a skin member disposed to at least one side of said core member and being made with a layer of ceramics material which covers substantially the entire surface of the core member, wherein said ceramics material is a metal oxide selected from the group consisting of berrylia (BeO), alumina (Al 2 O 3 ), magnesia (MgO), silicon dioxide (SiO 2 ) and titania (TiO).
Claim 2
Dependent Claim
75 words
A diaphragm for an electro-acoustic transducer, comprising: a core member; and a skin member disposed to at least one side of said core member and being made with a layer of ceramics material which covers substantially the entire surface of the core member, wherein said ceramics material is a metal oxide selected from the group consisting of berrylia (BeO), alumina (Al 2 O 3 ), magnesia (MgO), silicon dioxide (SiO 2 ) and titania (TiO).
Claim 3
Dependent Claim
75 words
A diaphragm for an electro-acoustic transducer, comprising a composite board formed by a lamination of a layer of light-weight metal and a layer of ceramics material, wherein the layer of ceramics material covers substantially the entire surface of the layer of metal and wherein said ceramics material is a metal oxide selected from the group consisting of berrylia (BeO), alumina (Al 2 O 3 ), magnesia (MgO), silicon dioxide (SiO 2 ) and titania (TiO).
Claim 4
Dependent Claim
75 words
A diaphragm for an electro-acoustic transducer, comprising a composite board formed by a lamination of a layer of light-weight metal and a layer of ceramics material, wherein the layer of ceramics material covers substantially the entire surface of the layer of metal and wherein said ceramics material is a metal oxide selected from the group consisting of berrylia (BeO), alumina (Al 2 O 3 ), magnesia (MgO), silicon dioxide (SiO 2 ) and titania (TiO).
Claim 5
Dependent Claim
101 words
A diaphragm for an electro-acoustic transducer, comprising: a core member having a honeycomb structure; and a skin member disposed to at least one side of said core member and being made with a composite board formed by a lamination of a layer of light-weight metal and a layer of a ceramics material, wherein the layer of ceramics material covers substantially the entire surface of the layer of metal and wherein said ceramics material is a metal oxide selected from the group consisting of berrylia (BeO), alumina (Al 2 O 3 ), magnesia (MgO), silicon dioxide (SiO 2 ) and titania (TiO).
Claim 6
Dependent Claim
101 words
A diaphragm for an electro-acoustic transducer, comprising: a core member having a honeycomb structure; and a skin member disposed to at least one side of said core member and being made with a composite board formed by a lamination of a layer of light-weight metal and a layer of a ceramics material, wherein the layer of ceramics material covers substantially the entire surface of the layer of metal and wherein said ceramics material is a metal oxide selected from the group consisting of berrylia (BeO), alumina (Al 2 O 3 ), magnesia (MgO), silicon dioxide (SiO 2 ) and titania (TiO).
Claim 7
Dependent Claim
17 words
A diaphragm according to claim 3, in which said honeycomb core is formed with an aluminum foil.
Claim 8
Dependent Claim
68 words
A diaphragm for an electro-acoustic transducer, comprising: a core member; and a skin member disposed to at least one side of said core member and being made with a layer of a single ceramics material which covers substantially the entire surface of the core member, wherein said ceramics material is a metal boride selected from the group consisting of chromium boride (CrB) and zirconium boride (ZrB 2 ).
Claim 9
Dependent Claim
68 words
A diaphragm for an electro-acoustic transducer, comprising: a core member; and a skin member disposed to at least one side of said core member and being made with a layer of a single ceramics material which covers substantially the entire surface of the core member, wherein said ceramics material is a metal boride selected from the group consisting of chromium boride (CrB) and zirconium boride (ZrB 2 ).
Claim 10
Dependent Claim
17 words
A diaphragm according to claims 1 or 5, in which said core member has a honeycomb structure.
Claim 11
Dependent Claim
17 words
A diaphragm according to claim 6, in which said honeycomb core is formed with an aluminum foil.
Claim 12
Dependent Claim
45 words
A diaphragm according to claims 1 or 5, in which said skin member made with a layer of a single ceramic material is one formed by depositing a ceramics material on a base by relying on a PVD method, and thereafter by removing said base.
Claim 13
Dependent Claim
65 words
A diaphragm for electro-acoustic transducer, comprising a composite board formed by a lamination of a layer of light-weight metal and a layer of ceramic material, wherein the layer of ceramics material covers substantially the entire surface of the layer of metal and wherein said ceramics material is a metal boride selected from the group consisting of chromium boride (CrB) and zirconium boride (ZrB 2 ).
Claim 14
Dependent Claim
65 words
A diaphragm for electro-acoustic transducer, comprising a composite board formed by a lamination of a layer of light-weight metal and a layer of ceramic material, wherein the layer of ceramics material covers substantially the entire surface of the layer of metal and wherein said ceramics material is a metal boride selected from the group consisting of chromium boride (CrB) and zirconium boride (ZrB 2 ).
Claim 15
Dependent Claim
16 words
A diaphragm according to claims 2 or 9, wherein said composite board has a dome-like configuration.
Claim 16
Dependent Claim
16 words
A diaphragm according to claims 2 or 9, wherein said composite board has a cone-shaped configuration.
Claim 17
Dependent Claim
23 words
A diaphragm according to claims 1 or 9, in which said layer of ceramics of material has a thickness of 20 μm-75 μm.
Claim 18
Dependent Claim
92 words
A diaphragm for electro-acoustic transducer, comprising: a core member having a honeycomb structure; and a skin member disposed to at least one side of said core member and being made with a composite board formed by a lamination of a layer of a light-weight metal and a layer of a ceramics material wherein the layer of ceramics material covers substantially the entire surface of the layer of metal and wherein said ceramics material is a metal boride selected from the group consisting of chromium boride (CrB) and zirconium boride (ZrB 2 ).
Claim 19
Dependent Claim
92 words
A diaphragm for electro-acoustic transducer, comprising: a core member having a honeycomb structure; and a skin member disposed to at least one side of said core member and being made with a composite board formed by a lamination of a layer of a light-weight metal and a layer of a ceramics material wherein the layer of ceramics material covers substantially the entire surface of the layer of metal and wherein said ceramics material is a metal boride selected from the group consisting of chromium boride (CrB) and zirconium boride (ZrB 2 ).
Claim 20
Dependent Claim
32 words
A diaphragm according to claims 2, 3, 9 or 13, wherein said composite board is one formed by depositing a ceramics material on a light-weight metal by relying on a PVD method.
Claim 21
Dependent Claim
30 words
A diaphragm according to claims 2, 3, 9 or 13, wherein said light-weight metal is one selected from the group consisting of aluminum, beryllium, magnesium, titanium, boron and their alloys.
Claim 22
Dependent Claim
23 words
A diaphragm according to claims 2, 3, 9 or 13, in which said light-weight metal has a specific gravity of 5.0 or smaller.
Claim 23
Dependent Claim
42 words
A diaphragm according to claims 2, 3, 9 or 13, in which said composite board has a thickness of 50 μm, and in which said layer of light-weight metal and said layer of ceramics material each has a thickness of 25 μm.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-08-16 | 1986-02-15 | 1986-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-16 | 1990-02-15 | 1990-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-16 | 1994-02-15 | 1994-08-17 | $7700.00 | Window Closed / Lapsed |