Patent US3573396A successfully refreshed from Google Patents.
US3573396A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Loudspeaker having improved diaphragm
Assignee: ELECTRONIC RES ASS
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Filing: 1967-11-17
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Granted: 1971-04-06
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Expires: 1987-11-17
Abstract
Abstract A loudspeaker assembly of a thin, compact, lightweight construction having a diaphragm which preferably is formed of cellular plastic material and provided with an integral marginal gasket. The diaphragm is mounted on a frame which is preferably formed of a solid body of the same or acoustically similar plastic material. The diaphragm has a concavo-convex form modified with acoustical materials and is capable of faithfully reproducing low frequency, midrange, and high frequency vibrations. The diaphragm is actuated by a voice coil mounted at the rear of the convex zone of the diaphragm, whereby the diaphragm and the magnetic assembly for actuating the same are constructed and arranged so as to provide an assembly which is not only relatively thin but may also present a labyrinth type of dust shield for the diaphragm actuating means. The frame further incorporates built-in centering and spacing tooling which is removed following manufacture.
Inventors
- 👤 Herbert Schoengold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:05
CPC Classifications
H; H04; H04R; H04R7/00; H04R7/02; H04R7/12; H04R7/04; H04R7/16; H04R7/18; H04R7/20; H04R9/00; H04R9/02; H04R9/04; H04R9/045; H04R9/06; H04R9/063
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
117 words
A relatively thin flat loudspeaker assembly comprising a frame, a diaphragm having a central flat zone surrounded by an inclined connecting surface extending from said central zone to an outer sound-reproducing zone of the diaphragm which is inclined oppositely to said connecting surface, compliance grooves in the diaphragm between said outer zone and marginal edges of the diaphragm, the marginal edges of the diaphragm being connected to said frame and lying in substantially the same plane as the central zone of the diaphragm, a voice coil connected to the central flat zone of the diaphragm near the midportion thereof, and a magnetic assembly supported by said frame and located adjacent said voice coil for actuating said diaphragm.
Claim 2
Dependent Claim
117 words
A relatively thin flat loudspeaker assembly comprising a frame, a diaphragm having a central flat zone surrounded by an inclined connecting surface extending from said central zone to an outer sound-reproducing zone of the diaphragm which is inclined oppositely to said connecting surface, compliance grooves in the diaphragm between said outer zone and marginal edges of the diaphragm, the marginal edges of the diaphragm being connected to said frame and lying in substantially the same plane as the central zone of the diaphragm, a voice coil connected to the central flat zone of the diaphragm near the midportion thereof, and a magnetic assembly supported by said frame and located adjacent said voice coil for actuating said diaphragm.
Claim 3
Dependent Claim
51 words
Sound-reproducing equipment as defined in claim 1 wherein the central flat zone of the diaphragm has an annular reinforcing rib extending rearwardly from the marginal portions thereof into a position surrounding the magnetic assembly and serving as a dust guard establishing a labyrinth passage between said rib and the magnetic assembly.
Claim 4
Dependent Claim
31 words
Sound-reproducing equipment as defined in claim 1 wherein the frame and diaphragm are substantially rectangular in shape and said compliance grooves extend parallel to the longitudinal edges only of said diaphragm.
Claim 5
Dependent Claim
39 words
Sound-reproducing equipment as defined by claim 1 wherein the diaphragm is formed with compliance means adjacent the marginal edges thereof, said compliance means being provided with slots therein extending inward from edges of the diaphragm toward said voice coil.
Claim 6
Dependent Claim
58 words
Sound-reproducing equipment as defined in claim 1 wherein said frame and diaphragm are generally rectangular in shape, compliance means in the form of corrugations are formed in said diaphragm adjacent the marginal edges of the diaphragm, and slots are formed in said corrugations and extend diagonally inward from edges of the diaphragm near the corners of said diaphragm.
Claim 7
Dependent Claim
42 words
Sound-reproducing equipment as defined in claim 1 wherein said diaphragm is formed of stiff, cellular plastic material and the marginal edges of the diaphragm are provided with an integral compressible gasket consisting of a thickened marginal rim of said cellular plastic material.
Claim 8
Dependent Claim
46 words
Sound-reproducing equipment as defined in claim 1 comprising a diaphragm formed of cellular plastic mAterial, a frame formed of a solid body of plastic material, the marginal edges of said diaphragm being supported by said frame, and means carried by said frame for actuating said diaphragm.
Claim 9
Dependent Claim
22 words
Sound-reproducing equipment as defined in claim 7 wherein the diaphragm and frame are formed of plastic material having essentially the same composition.
Claim 10
Dependent Claim
95 words
Sound-reproducing equipment as defined in claim 7 wherein said diaphragm has a central portion presenting a convex surface lying in substantially the same plane as the marginal edges of the diaphragm and surrounded by a portion of said diaphragm presenting a concave surface, a voice coil mounted on a voice coil form connected to said central portion of the diaphragm and projecting from the concave side thereof, a magnetic assembly surrounding said voice coil, said frame having a ring in which said magnetic assembly is mounted and arms extending from said ring to said frame.
Claim 11
Dependent Claim
29 words
A sound-reproducing device as defined in claim 1 wherein said diaphragm is formed of cellular plastic material and said frame is formed of a solid body of plastic material.
Claim 12
Dependent Claim
35 words
A sound-reproducing device as defined in claim 1 wherein the central portion of the diaphragm is provided with an insert secured about its edges to the surrounding portions of the diaphragm by compliant damping material.
Claim 13
Dependent Claim
27 words
A sound-reproducing device as defined in claim 1 wherein the central portion of the diaphragm is at least partially decoupled from the remaining portions of the diaphragm.
Claim 14
Dependent Claim
42 words
A sound-reproducing device as defined in claim 3 wherein the diaphragm is provided with slots extending diagonally inward from the corners thereof and the portions of the diaphragm at opposite sides of said slots are secured to the frame by yieldable means.
Claim 15
Dependent Claim
29 words
A sound-reproducing device as defined in claim 1 wherein the frame is provided with removable positioning elements for assuring accurate location of the diaphragm with respect to the frame.
References Cited (Backward Citations)
US2537253A
Cited
US2534157A
Cited
US2863520A
Cited
US3026958A
Cited
US3032138A
Cited
US3268672A
Cited
US3430007A
Cited
GB1122698A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-04-05 | 1974-10-05 | 1975-04-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-05 | 1978-10-05 | 1979-04-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-05 | 1982-10-05 | 1983-04-06 | $7700.00 | Window Closed / Lapsed |