US3711659A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Loudspeaker voice coils
Assignee: Individual
•
Filing: 1971-01-20
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Granted: 1973-01-16
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Expires: 1991-01-20
Abstract
Abstract An improvement in the method and manner of constructing a loud speaker voice coil, such improvement consisting of utilizing conductive metal foil as the wound element for supported positioning and reciprocal movement within an associated magnetic air gap; such a metallic foil coil may consist of one or more turns of either superimposed or alternately off-set foil windings.
Inventors
- 👤 G Bremseth
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:30
CPC Classifications
H; H04; H04R; H04R9/00; H04R9/02; H04R9/04; H04R9/046
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
142 words
In an electromagnetic transducer assembly of the type having a frame member supporting a diaphragm in contact with the surrounding air, and a magnet assembly secured in place by said frame member to define an air gap having magnetic flux present thereacross, the coil structure comprising: coil former means securely affixed to said diaphragm and disposed to be supported within said air gap; coil means formed from metallic foil wound in circuitous form, said coil means being wound upon said coil former means within said air gap with each alternate winding of said metallic foil in an off-set relationship relative to a mid-position within said air gap; means providing insulation between any one part of said metallic foil and another part of said metallic foil; and conduction means providing electrical connection to each one of the opposite ends of said metallic foil.
Claim 2
Dependent Claim
142 words
In an electromagnetic transducer assembly of the type having a frame member supporting a diaphragm in contact with the surrounding air, and a magnet assembly secured in place by said frame member to define an air gap having magnetic flux present thereacross, the coil structure comprising: coil former means securely affixed to said diaphragm and disposed to be supported within said air gap; coil means formed from metallic foil wound in circuitous form, said coil means being wound upon said coil former means within said air gap with each alternate winding of said metallic foil in an off-set relationship relative to a mid-position within said air gap; means providing insulation between any one part of said metallic foil and another part of said metallic foil; and conduction means providing electrical connection to each one of the opposite ends of said metallic foil.
Claim 3
Dependent Claim
37 words
A transducer assembly as set forth in claim 1 wherein said strip of metallic foil is formed into a coil with successive windings displaced from superposition by predetermined amounts which vary the inductive characteristics in pre-set manner.
References Cited (Backward Citations)
GB383664A
Cited
US2445276A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-16 | 1976-07-17 | 1977-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-16 | 1980-07-17 | 1981-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-16 | 1984-07-17 | 1985-01-16 | $7700.00 | Window Closed / Lapsed |