Patent US4057694A successfully refreshed from Google Patents.
US4057694A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Speaker diaphragm having flat response curve
Assignee: Pioneer Corp
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Filing: 1976-10-21
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Granted: 1977-11-08
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Expires: 1996-10-21
Abstract
Abstract The nodal circle between the inner and outer concentric portions of an audio speaker diaphragm is positioned so that the ratio of the areas of the inner and outer portions is approximately equal to the ratio of their respective masses, whereby the frequency response curve remains relatively flat and is not affected by first order resonance.
Inventors
- 👤 Akio Obuchi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:16
CPC Classifications
H; H04; H04R; H04R7/00; H04R7/02; H04R7/12; H04R7/127; H04R9/00; H04R9/06
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
120 words
In a audio speaker including a diaphragm having concentric, contiguous inner and outer portions, said diaphragm being adapted to vibrate in a split mode wherein the interface between said inner and outer portions is defined by a nodal circle, and a voice coil operatively associated with one of said portions, the improvement characterized by: the nodal circle being positioned such that the ratio S i : S o is approximately equal to the ratio m i : m o , where S i is the surface area of the inner portion, S o is the surface area of the outer portion, m i is the mass of the inner portion, and m o is the mass of the outer portion.
Claim 2
Dependent Claim
120 words
In a audio speaker including a diaphragm having concentric, contiguous inner and outer portions, said diaphragm being adapted to vibrate in a split mode wherein the interface between said inner and outer portions is defined by a nodal circle, and a voice coil operatively associated with one of said portions, the improvement characterized by: the nodal circle being positioned such that the ratio S i : S o is approximately equal to the ratio m i : m o , where S i is the surface area of the inner portion, S o is the surface area of the outer portion, m i is the mass of the inner portion, and m o is the mass of the outer portion.
Claim 3
Dependent Claim
71 words
An audio speaker as defined in claim 1, wherein the diaphragm is dome-shaped, the voice coil is associated with the outer portion, m i includes the mass of the inner portion of the diaphragm and the mass of the boundary air surrounding it, and m o includes the mass of the outer portion of the diaphragm, the mass of the boundary air surrounding it, and the mass of the voice coil.
Claim 4
Dependent Claim
71 words
An audio speaker as defined in claim 1, wherein the diaphragm in cone-shaped, the voice coil is associated with the inner portion, m i includes the mass of the inner portion of the diaphragm, the mass of the boundary air surrounding it, and the mass of the voice coil, and m o includes the mass of the outer portion of the diaphragm and the mass of the boundary air surrounding it.
Claim 5
Dependent Claim
23 words
An audio speaker as defined in claim 1, wherein S i : S o = (0.8 - 1.2)m i : m o .
Claim 6
Dependent Claim
23 words
An audio speaker as defined in claim 2, wherein S i : S o = (0.8 - 1.2)m i : m o .
Claim 7
Dependent Claim
23 words
An audio speaker as defined in claim 3, wherein S i : S o = (0.8 - 1.2)m i : m o .
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-11-07 | 1981-05-09 | 1981-11-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-11-07 | 1985-05-09 | 1985-11-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-11-07 | 1989-05-09 | 1989-11-08 | $7700.00 | Window Closed / Lapsed |