US4868882A
Expired / Lapsed
US
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Loudspeaker
Assignee: Daimler Benz AG
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Filing: 1988-09-12
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Granted: 1989-09-19
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Expires: 2008-09-12
Abstract
Abstract A loudspeaker is disclosed with a diaphragm and an annular moving coil fastened to the diaphragm. An annular permanent-magnet system is arranged concentrically relative to the moving coil and is fastened to a support. To obtain a high-power and extremely slim system, the moving coil surrounds the permanent-magnet system with only a small air gap and, on its outer surface, carries a thin-walled annular core of amorphous metal. The permanent-magnet system consists of two permanent-magnet rings spaced from one another by means of a soft-mangetic annular intermediate disc and having like poles facing one another.
Inventors
- 👤 Alfred Ziegenberg
- 👤 Edmund Schiessle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 07:27
CPC Classifications
H; H04; H04R; H04R9/00; H04R9/06; H04R9/063; H04R1/00; H04R1/02; H04R1/021; H04R9/02; H04R9/025
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
107 words
Loudspeaker with a diaphragm and an annular moving coil fastened to the diaphragm concentrically relative to its center and a coil axis of which extends perpendicularly relative to the diaphragm, and with an annular permanent-magnet system arranged concentrically relative to the moving coil and fastened to a support, wherein the moving coil surrounds the permanent-magnet system with only a small air gap and carries on its outer surface a thin-walled annular core of amorphous metal, and wherein the permanent-magnet system comprises two permanent-magnet rings having like poles facing one another, said permanent magnet rings being spaced from one another by means of a soft-magnetic annular intermediate disc.
Claim 2
Dependent Claim
107 words
Loudspeaker with a diaphragm and an annular moving coil fastened to the diaphragm concentrically relative to its center and a coil axis of which extends perpendicularly relative to the diaphragm, and with an annular permanent-magnet system arranged concentrically relative to the moving coil and fastened to a support, wherein the moving coil surrounds the permanent-magnet system with only a small air gap and carries on its outer surface a thin-walled annular core of amorphous metal, and wherein the permanent-magnet system comprises two permanent-magnet rings having like poles facing one another, said permanent magnet rings being spaced from one another by means of a soft-magnetic annular intermediate disc.
Claim 3
Dependent Claim
27 words
Loudspeaker according to claim 1, wherein the annular core consists of a high-permeability amorphous metal foil having a high specific electrical resistance and a very low magnetostriction.
Claim 4
Dependent Claim
16 words
Loud speaker according to claim 1, wherein the soft-magnetic annular intermediate disc consists of amorphous metal.
Claim 5
Dependent Claim
19 words
Loudspeaker according to claim 1, wherein the permanent-magnet rings consists of one of cobalt/samarium alloy, and a NdFe/B alloy.
Claim 6
Dependent Claim
17 words
Loudspeaker according to claim 1, wherein the diaphragm is clamped in a frame of a non-magnetic support.
Claim 7
Dependent Claim
27 words
Loudspeaker according to claim 1, wherein the diaphragm and, together with it, the moving coil are fastened to a baseplate of a non-magnetic support via spring means.
Claim 8
Dependent Claim
14 words
Loudspeaker according to claim 5, wherein the diaphragm has a circular or oval form.
Claim 9
Dependent Claim
12 words
Loudspeaker according to claim 6, wherein the diaphragm has a rectangular form.
Claim 10
Dependent Claim
11 words
Loudspeaker according to claim 1, wherein the diaphragm is made planar.
Claim 11
Dependent Claim
11 words
Loudspeaker according to claim 1, wherein the diaphragm is made funnel-shaped.
Claim 12
Dependent Claim
46 words
Loudspeaker according to claim 1, wherein at least one auxiliary diaphragm extends horizontally from a region within the diaphragm to the free end of the moving coil and is fastened to the diaphragm on the one hand and to the moving coil on the other hand.
Claim 13
Dependent Claim
30 words
Loudspeaker according to claim 1, further comprising a non-magnetic support, consisting of a frame and a baseplate, there being several sound transmission orifices in at least one of these parts.
Claim 14
Dependent Claim
41 words
Loudspeaker according to claim 12, further comprising sound guide parts of which extend from a middle region up to the sound transmission orifices of the frame are arranged on a side of the baseplate of the support which faces the diaphragm.
Claim 15
Dependent Claim
17 words
Loudspeaker according to claim 1, wherein the diaphragm is covered by a screen fastened to the support.
Claim 16
Dependent Claim
137 words
Loudspeaker according to claim 1, wherein a further permanent-magnet ring with a facing like pole is assigned to one of the two permanent-magnet rings and being spaced from it by means of a further soft-magnetic annular intermediate disc, the moving coil surrounding the permanent-magnet rings and a further moving coil surrounded with an annular core of amorphous metal surrounding the permanent-magnet rings with only a small air gap, and furthermore the two moving coils being electrically connected opposite in series to form a composite moving coil and being arranged at a short distance (d) from one another, and wherein the diaphragm is funnel-shaped on the one hand, and is fastened to the composite coil and on the other hand, a like further funnel-shaped diaphragm is fastened to the composite moving coil, and is clamped in the frame.
Claim 17
Dependent Claim
138 words
Loudspeaker according to claim 12, wherein a further permanent-magnet ring with a facing like pole is assigned to one of the two permanent-magnet rings and being spaced from it by means of a further soft-magnetic annular intermediate disc, the moving coil surrounding the permanent-magnet rings and a further moving coil surrounded with an annular core of amorphous metal surrounding the permanent-magnet rings with only a small air gap, and furthermore the two moving coils being electrically connected oppositely in series to form a composite moving coil and being arranged at a short distance (d) from one another, and wherein the diaphragm is funnel-shaped on the one hand, and is fastened to the composite moving coil and on the other hand, a like further funnel-shaped diaphragm is fastened to the composite moving coil, and is clamped in the frame.
Claim 18
Dependent Claim
12 words
Loudspeaker according to claim 1, wherein said loudspeaker is a full-range loudspeaker.
Claim 19
Dependent Claim
27 words
Loudspeaker according to claim 1, wherein only said two permanent-magnet rings are provided and only said single diaphragm is provided, wherein a single diaphragm loudspeaker is obtained.
Claim 20
Dependent Claim
17 words
Loudspeaker according to claim 1, wherein the soft-magnetic annular intermediate disc consists of layered amorphous metal-foil discs.
References Cited (Backward Citations)
JPS579197A
Cited
JPS59148500A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1992-09-18 | 1993-03-20 | 1993-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-09-18 | 1997-03-20 | 1997-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-09-18 | 2001-03-20 | 2001-09-19 | $7700.00 | Window Closed / Lapsed |