US3832499A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electro-acoustic transducer
Assignee: Individual
•
Filing: 1973-01-08
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Granted: 1974-08-27
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Expires: 1993-01-08
Abstract
Abstract An electro-acoustic transducer comprising permanent magnet means producing a magnetic field and defining a space communicating with the outer atmosphere, and diaphragm means located in said space and comprising a corrugated sheet of flexible material and a metal foil applied in a meander pattern to at least one face of the plastic sheet.
Inventors
- 👤 O Heil
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 04:30
CPC Classifications
H; H04; H04R; H04R9/00; H04R9/02; H04R9/04; H04R9/046; H04R9/047; H04R9/06; H04R9/063
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
177 words
An electro-acoustic transducer comprising means for producing a magnetic field, a diaphragm disposed in said magnetic field with the plane of the diaphragm generally perpendicular to the lines of force of said magnetic field, said diaphragm comprising a sheet of thin, flexible, non-conductive material having a pair of opposite end edges and having corrugations formed in said sheet defining a plurality of adjacent substantially parallel portions extending between said end edges with curved connecting portions alternately connecting said parallel portions to each other to define a plurality of narrow air spaces having open sides alternatingly facing in opposite directions; and means for conducting an electric current attached to said sheet and comprising a plurality of elongated electrically conductive portions extending along said parallel portions of said sheet substantially normal to said end edges and parallel to said open sides, and connecting portions serially connecting said elongated portions to each other, whereby during passage of an audiofrequency current through said conducting means, said diaphragm will be vibrated to emit sound through said open sides of said air spaces.
Claim 2
Dependent Claim
177 words
An electro-acoustic transducer comprising means for producing a magnetic field, a diaphragm disposed in said magnetic field with the plane of the diaphragm generally perpendicular to the lines of force of said magnetic field, said diaphragm comprising a sheet of thin, flexible, non-conductive material having a pair of opposite end edges and having corrugations formed in said sheet defining a plurality of adjacent substantially parallel portions extending between said end edges with curved connecting portions alternately connecting said parallel portions to each other to define a plurality of narrow air spaces having open sides alternatingly facing in opposite directions; and means for conducting an electric current attached to said sheet and comprising a plurality of elongated electrically conductive portions extending along said parallel portions of said sheet substantially normal to said end edges and parallel to said open sides, and connecting portions serially connecting said elongated portions to each other, whereby during passage of an audiofrequency current through said conducting means, said diaphragm will be vibrated to emit sound through said open sides of said air spaces.
Claim 3
Dependent Claim
36 words
An electro-acoustic transducer as defined in claim 1, wherein said parallel portions of said corrugated sheets are curved, the axes of curvature of said curved parallel portions being parallel to those of said curved connecting portions.
Claim 4
Dependent Claim
30 words
An electro-acoustic transducer as defined in claiM 1, wherein said sheet of thin, flexible, non-conductive material is a plastic having a low modulus of elasticity and a high internal friction.
Claim 5
Dependent Claim
24 words
An electro-acoustic transducer as defined in claim 1, wherein said sheet of thin, flexible, non-conductive material comprises a hard material having a viscous coating.
Claim 6
Dependent Claim
29 words
An electro-acoustic transducer as defined in claim 1, wherein said means for conducting an electric current is a metal foil attached to at least one face of said sheet.
Claim 7
Dependent Claim
68 words
An electro-acoustic transducer as defined in claim 1, and including a pair of electrical conductors attached to said sheet extending respectively along said end edges, the electrical conductor at one of said end edges being connected to one end of said serially connected conducting elongated portions and the other conductor at said other end edge being connected to the other end of said serially connected conducting elongated portions.
Claim 8
Dependent Claim
37 words
An electro-acoustic transducer as defined in claim 1, and including an electrical conductor attached to and extending along each of said end edges of said sheet, said electrical conductor being folded lengthwise onto itself for mechanical reinforcement.
Claim 9
Dependent Claim
47 words
An electro-acoustic transducer as defined in claim 1, and including an electrical conductor attached to and extending along each of said end edges of said sheet, said electrical conductor having a row of equally spaced holes the spacing of width equals the width of the diaphragm folds.
Claim 10
Dependent Claim
81 words
An electro-acoustic transducer as defined in claim 1, wherein said means for producing a magnetic field comprises a permanent magnet portion having at least two magnetic poles, a pole shoe portion for each of said magnetic poles with oppositely polarized pole shoe portions spaced apart to define openings in said pole shoe portions generally parallel to the lines of force crossing said magnetic field gap through which said magnetic field gap communicates with the space outside of said pole shoe portions.
Claim 11
Dependent Claim
57 words
An electro-acoustic transducer as defined in claim 7, wherein said pole shoe portions comprise a stack of alternately arranged longer and shorter magnetically permeable laminates, said longer and shorter laminates defining between themselves, proximate said magnetic field gap, a plurality of openings through which said magnetic field gap communicates with the space outside said pole shoe portion.
Claim 12
Dependent Claim
27 words
An electro-acoustic transducer as defined in claim 7, wherein the plane of said pole shoe portions is disposed at an angle to the plane of said diaphragm.
References Cited (Backward Citations)
US3497642A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-08-26 | 1978-02-25 | 1978-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-26 | 1982-02-25 | 1982-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-26 | 1986-02-25 | 1986-08-27 | $7700.00 | Window Closed / Lapsed |