US3763334A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnet assembly
Assignee: General Electric Co
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Filing: 1972-01-21
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Granted: 1973-10-02
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Expires: 1992-01-21
Abstract
Abstract A permanent magnet assembly adapted for use in a loudspeaker, particularly one having a low-flux density permanent magnet, comprising a one-piece return path element having two ring-shaped concentric segments, between which is fitted a ring-shaped, radially oriented permanent magnet. The two concentric segments of the return path are open at the axial top portion thereof and are joined at the lower axial portion thereof by a bridge member which is circumferentially divided except for a small portion thereof. The radially inward segment of the return path has an upper axial portion which is wider than the remaining portion of the segment to concentrate the magnetic flux at the air gap. A centrally disposed pole piece fits within the return pathpermanent magnet assembly to complete the magnetic circuit of the permanent magnet loudspeaker.
Inventors
- 👤 R Parker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 15:30
CPC Classifications
H; H04; H04R; H04R9/00; H04R9/02; H04R9/025; H04R2209/00; H04R2209/022
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
86 words
A peranent magnet assembly adapted for use in a loudspeaker comprising a radially oriented ring-shaped permanent magnet, a return path element having two concentric-ring-shaped segments open at the top axial portion thereof and joined at the lower axial portion thereof by a bridge member which is circumferentially divided except for a small portion thereof, the radially inward ring-shaped segment having a top axial portion of enlarged thickness, the permanent magnet fitting within, and in physical contact with, the two concentric segments of the return path element.
Claim 2
Dependent Claim
86 words
A peranent magnet assembly adapted for use in a loudspeaker comprising a radially oriented ring-shaped permanent magnet, a return path element having two concentric-ring-shaped segments open at the top axial portion thereof and joined at the lower axial portion thereof by a bridge member which is circumferentially divided except for a small portion thereof, the radially inward ring-shaped segment having a top axial portion of enlarged thickness, the permanent magnet fitting within, and in physical contact with, the two concentric segments of the return path element.
Claim 3
Dependent Claim
140 words
In a permanent magnet loudspeaker, a permanent magnet assembly comprising a radially oriented ring-shaped permanent magnet, a return path element having two concentric ring-shaped segments open at the top axial portion thereof and joined at the bottom axial portion thereof by a bridge member which is circumferentially divided except for a small portion thereof, the radially inward ring-shaped segment having a top axial portion of enlarged thickness, the permanent magnet fitting within, and in magnetic circuit contact with, the two concentric segments of the return path element, a pole piece located concentrically within the radially inward ring-shaped segment of the return path element, said pole piece being in contact with said radially inward ring-shaped segment at a lower axial portion thereof and being spaced from said inner ring-shaped segment at the upper axial portion thereof to fOrm an air gap.
Claim 4
Dependent Claim
140 words
In a permanent magnet loudspeaker, a permanent magnet assembly comprising a radially oriented ring-shaped permanent magnet, a return path element having two concentric ring-shaped segments open at the top axial portion thereof and joined at the bottom axial portion thereof by a bridge member which is circumferentially divided except for a small portion thereof, the radially inward ring-shaped segment having a top axial portion of enlarged thickness, the permanent magnet fitting within, and in magnetic circuit contact with, the two concentric segments of the return path element, a pole piece located concentrically within the radially inward ring-shaped segment of the return path element, said pole piece being in contact with said radially inward ring-shaped segment at a lower axial portion thereof and being spaced from said inner ring-shaped segment at the upper axial portion thereof to fOrm an air gap.
Claim 5
Dependent Claim
49 words
The permanent magnet assembly of claim 1 in which the return path element is integral and the concentric ring-shaped segments of the return path element are joined at the bottom axial portion thereof by a bridge member which is circumferentially divided except for a plurality of thin connecting strips.
Claim 6
Dependent Claim
15 words
The permanent magnet assembly of claim 1 in which the permanent magnet is a ferrite.
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) | 1976-10-01 | 1977-04-02 | 1977-10-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-01 | 1981-04-02 | 1981-10-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-01 | 1985-04-02 | 1985-10-02 | $7700.00 | Window Closed / Lapsed |