Patent US3603427A successfully refreshed from Google Patents.
US3603427A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Loudspeaker
Assignee: Nippon Gakki Co Ltd
•
Filing: 1969-05-05
•
Granted: 1971-09-07
•
Expires: 1989-05-05
Abstract
Abstract A loudspeaker including a diaphragm of rigid, self-supporting, foamed plastic material clamped at its peripheral portion to a speaker frame, without providing increased compliance at said peripheral portion, to generate sound by bending motion of said diaphragm, said diaphragm having a soft material such as foamed or unfoamed rubberlike material (e.g. natural rubber, synthetic rubber or rubberlike plastic material) applied on at least a part of the peripheral portion at at least one side thereof, said soft material having relatively high specific gravity sufficient to suppress divided vibration of the diaphragm in low frequency sound range.
Inventors
- 👤 Hiromi Sotome
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 09:18
CPC Classifications
H; H04; H04R; H04R7/00; H04R7/26; H04R7/02; H04R7/16; H04R7/18; H04R7/20; H04R2307/00; H04R2307/201
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
96 words
A loudspeaker comprising a speaker frame having an attaching surface, a diaphragm of rigid, self-supporting, foamed plastic material within said frame, said diaphragm having a vibrating portion for generating sound by bending movement thereof, and a soft material having opposing adhesive surfaces fixed at its one surface to the outer edge and part of the vibrating portion of the diaphragm and at its other surface to the attaching surface of the speaker frame, said soft material having relatively high specific gravity sufficient to suppress resonant divided vibration of the diaphragm in the low frequency sound range.
Claim 2
Dependent Claim
96 words
A loudspeaker comprising a speaker frame having an attaching surface, a diaphragm of rigid, self-supporting, foamed plastic material within said frame, said diaphragm having a vibrating portion for generating sound by bending movement thereof, and a soft material having opposing adhesive surfaces fixed at its one surface to the outer edge and part of the vibrating portion of the diaphragm and at its other surface to the attaching surface of the speaker frame, said soft material having relatively high specific gravity sufficient to suppress resonant divided vibration of the diaphragm in the low frequency sound range.
Claim 3
Dependent Claim
48 words
A loudspeaker according to claim 1 in which the soft material which is fixed to the speaker frame has an inner portion projecting inwardly of said speaker frame and the diaphragm has an outer edge aligned with the inner edge of the attaching surface of said speaker frame.
Claim 4
Dependent Claim
67 words
A loudspeaker according to claim 1 in which the soft material which is fixed to the speaker frame has an inner portion projecting inwardly of said speaker frame, the diaphragm has an outer edge terminating at about the middle of the attaching surface of said speaker frame and an adhesive retaining member is attached to said diaphragm and to said soft material at the outer portions thereof.
Claim 5
Dependent Claim
27 words
A loudspeaker according to claim 1 in which the diaphragm has an outer edge aligned with the outer edge of the attaching surface of the speaker frame.
Claim 6
Dependent Claim
18 words
A loudspeaker according to claim 1 in which the soft material has an inner periphery in serrated form.
Claim 7
Dependent Claim
18 words
A loudspeaker according to claim 1 in which the soft material has an inner periphery in sinuous form.
Claim 8
Dependent Claim
28 words
A loudspeaker according to claim 1, in which the the soft material has a tapered inside surface and gradually decreases its thickness toward the center of the diaphragm.
References Cited (Backward Citations)
US3308904A
Cited
US2716462A
Cited
US2815823A
Cited
US2863520A
Cited
BE626876A
Cited
US3247925A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-09-06 | 1975-03-08 | 1975-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-09-06 | 1979-03-08 | 1979-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-09-06 | 1983-03-08 | 1983-09-07 | $7700.00 | Window Closed / Lapsed |