Patent US3866710A successfully refreshed from Google Patents.
US3866710A
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US
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Horn loudspeakers
Assignee: Individual
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Filing: 1972-11-01
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Granted: 1975-02-18
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Expires: 1992-11-01
Abstract
Abstract The specification describes horn loudspeakers including electromechanical transducer means comprising a diaphragm having a solidly oscillating surface in opposition to another surface spaced from the diaphragm at an interval which is minimal in a location in particular at the center of the diaphragm, and which progessively increases towards the edge of the diaphragm, this interval forming the first part of a passage which progresses outside said edge within the rigid walls of the horn, the said diaphragm, another surface and walls being arranged to provide a passage substantially uninterrupted, having no sharp modifications of direction and cross-sectional area, and whose cross-sectional area progressively increases from said location to the mouth of the horn.
Inventors
- 👤 Mario Cesati
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 09:03
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/20; H04R1/22; H04R1/30; G; G10; G10K; G10K11/00; G10K11/02; G10K11/025
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
136 words
An acoustic device, particularly a horn-type loudspeaker, comprising an electro-magnetic transducer comprising a substantially rigid diaphragm having an active surface having a center and being mounted for oscillation in its entirety in a direction substantially normal to the outer contour of said surface; a first stationary member having an outer surface a portion of which is closely adjacent to said active surface; a second stationary member surrounding at least in part said first stationary member and having an inner surface from said outer surface of said first member, the curvature of the surfaces of said members and said diaphragm defining an air passageway extending from the center of said diaphragm in a direction transverse to said direction of oscillation, the cross section of said air passageway being minimal at said center and increasing in said direction.
Claim 2
Dependent Claim
136 words
An acoustic device, particularly a horn-type loudspeaker, comprising an electro-magnetic transducer comprising a substantially rigid diaphragm having an active surface having a center and being mounted for oscillation in its entirety in a direction substantially normal to the outer contour of said surface; a first stationary member having an outer surface a portion of which is closely adjacent to said active surface; a second stationary member surrounding at least in part said first stationary member and having an inner surface from said outer surface of said first member, the curvature of the surfaces of said members and said diaphragm defining an air passageway extending from the center of said diaphragm in a direction transverse to said direction of oscillation, the cross section of said air passageway being minimal at said center and increasing in said direction.
Claim 3
Dependent Claim
23 words
An acoustic device as defined in claim 1, wherein the rate of increase of said cross section of said air passageway is continuous.
Claim 4
Dependent Claim
21 words
An acoustic device as defined in claim 1, wherein said members extend substantially in said direction of oscillation of said diaphragm.
Claim 5
Dependent Claim
29 words
An acoustic device as defined in claim 1, wherein said outer surface of said first stationary member is convexly curved toward said active surface and toward said inner surface.
Claim 6
Dependent Claim
26 words
An acoustic device as defined in claim 1, wherein said inner surface of said second stationary member flares outwardly in a direction away from said diaphragm.
Claim 7
Dependent Claim
32 words
An acoustic device as defined in claim 1, wherein said first member is a rotationally summetric body with respect to an axis extending in the direction of oscillation of said rigid diaphragm.
Claim 8
Dependent Claim
21 words
An acoustic device as defined in claim 1, wherein said inner surface of said second member is a surface of revolution.
Claim 9
Dependent Claim
29 words
An acoustic device as defined in claim 1, wherein said second member is a sector of a body of revolution having an axis substantially normal to said active surface.
Claim 10
Dependent Claim
25 words
An acoustic device as defined in claim 1, wherein said active surface of said diaphragm is concavely curved toward said portion of said first member.
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) | 1978-02-17 | 1978-08-19 | 1979-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-17 | 1982-08-19 | 1983-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-17 | 1986-08-19 | 1987-02-18 | $7700.00 | Window Closed / Lapsed |