Patent US2220998A successfully refreshed from Google Patents.
US3870833A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Expandable suspension system for loudspeaker bobbin
Assignee: Pioneer Corp
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Filing: 1973-05-23
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Granted: 1975-03-11
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Expires: 1993-05-23
Abstract
Abstract The suspension wires extending tangentially to the outer periphery of the coil bobbin positioned within a cylindrical air gap of the magnetic circuit of a loudspeaker defined by the magnetic plate forming a portion of that circuit and the pole, include an integral wire coil portion permitting expansion and contraction in the direction of the wire axis. A viscous damper may be applied to the wire adjacent the coil intermediate the coil and the bobbin and may bridge the wire and the fixed magnetic plate.
Inventors
- 👤 Showzo Kinoshita
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 05:53
CPC Classifications
H; H04; H04R; H04R9/00; H04R9/02; H04R9/04; H04R9/041; H04R9/042
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
160 words
A loudspeaker including a cylindrical bobbin having a voice coil wound about its periphery and being suspended within a cylindrical air gap of the loudspeaker magnetic circuit which includes a fixed magnetic member, by means of a plurality of suspension wires which extend tangentially in the same direction from the outer periphery of the bobbin at equally spaced circumferential positions to the fixed magnetic member and are fixed at one end to the bobbin and at the opposite end to the fixed magnetic member, the improvement comprising: an integral, wire coil portion intermediate the ends of each wire and aligned coaxially therewith to permit the wires to expand and contract in the direction of the wire axis to diminish rotary oscillation of the bobbin during energization of the voice coil, but permitting the wire coil portion to bend along with the remaining portion of each wire to permit axial movement of the bobbin with respect to the fixed magnetic member.
Claim 2
Dependent Claim
160 words
A loudspeaker including a cylindrical bobbin having a voice coil wound about its periphery and being suspended within a cylindrical air gap of the loudspeaker magnetic circuit which includes a fixed magnetic member, by means of a plurality of suspension wires which extend tangentially in the same direction from the outer periphery of the bobbin at equally spaced circumferential positions to the fixed magnetic member and are fixed at one end to the bobbin and at the opposite end to the fixed magnetic member, the improvement comprising: an integral, wire coil portion intermediate the ends of each wire and aligned coaxially therewith to permit the wires to expand and contract in the direction of the wire axis to diminish rotary oscillation of the bobbin during energization of the voice coil, but permitting the wire coil portion to bend along with the remaining portion of each wire to permit axial movement of the bobbin with respect to the fixed magnetic member.
Claim 3
Dependent Claim
160 words
A loudspeaker including a cylindrical bobbin having a voice coil wound about its periphery and being suspended within a cylindrical air gap of the loudspeaker magnetic circuit which includes a fixed magnetic member, by means of a plurality of suspension wires which extend tangentially in the same direction from the outer periphery of the bobbin at equally spaced circumferential positions to the fixed magnetic member and are fixed at one end to the bobbin and at the opposite end to the fixed magnetic member, the improvement comprising: an integral, wire coil portion intermediate the ends of each wire and aligned coaxially therewith to permit the wires to expand and contract in the direction of the wire axis to diminish rotary oscillation of the bobbin during energization of the voice coil, but permitting the wire coil portion to bend along with the remaining portion of each wire to permit axial movement of the bobbin with respect to the fixed magnetic member.
Claim 4
Dependent Claim
160 words
A loudspeaker including a cylindrical bobbin having a voice coil wound about its periphery and being suspended within a cylindrical air gap of the loudspeaker magnetic circuit which includes a fixed magnetic member, by means of a plurality of suspension wires which extend tangentially in the same direction from the outer periphery of the bobbin at equally spaced circumferential positions to the fixed magnetic member and are fixed at one end to the bobbin and at the opposite end to the fixed magnetic member, the improvement comprising: an integral, wire coil portion intermediate the ends of each wire and aligned coaxially therewith to permit the wires to expand and contract in the direction of the wire axis to diminish rotary oscillation of the bobbin during energization of the voice coil, but permitting the wire coil portion to bend along with the remaining portion of each wire to permit axial movement of the bobbin with respect to the fixed magnetic member.
Claim 5
Dependent Claim
19 words
The loudspeaker as claimed in claim 1, wherein each suspension wire further includes viscous damping means operatively associated therewith.
Claim 6
Dependent Claim
56 words
The loudspeaker as claimed in claim 2, wherein said viscous damping means comprises a mass of viscous damping material fixed to each wire and said fixed magnetic member and bridging the gap between the wires and said fixed magnetic member and positioned to the side of said unitary, integral wire coil portion closest to said bobbin.
Claim 7
Dependent Claim
25 words
The loudspeaker as claimed in claim 2, wherein said viscous damping mEans comprises a mass of viscous damping material surrounding each wire and supported thereby.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-10 | 1978-09-09 | 1979-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-10 | 1982-09-09 | 1983-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-10 | 1986-09-09 | 1987-03-11 | $7700.00 | Window Closed / Lapsed |