US3641284A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic phonograph pickup having plural inducing magnets
Assignee: HUBER AND CO
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Filing: 1969-12-15
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Granted: 1972-02-08
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Expires: 1989-12-15
Abstract
Abstract A magnetic phonograph pickup comprises interfitting stylus and sensing assemblies. The stylus is connected to a ferromagnetic element which is magnetically saturated by at least a pair of permanent magnets which are arranged, in a common plane at right angles to the plane of symmetry through the stylus assembly, adjacent this element with similar poles directed toward it. The sensing arrangement comprises coils adjacent the element which sense its movement and produce an output signal. The entire pickup is symmetrical about a central plane of symmetry, and the magnets are inclined to this plane.
Inventors
- 👤 Hugo Westerkamp
- 👤 Robert Dubois
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 08:20
CPC Classifications
H; H04; H04R; H04R11/00; H04R11/08; H04R11/12
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
110 words
A magnetic phonograph pickup comprising: a pickup housing; a stylus resiliently carried by said housing; a ferromagnetic element operatively connected with said stylus for joint movement therewith; magnetic means including at least two magnets mounteD on said housing adjacent said element and on opposite sides thereof, said magnets having similar magnetic poles turned toward said element, all of the magnets of said magnetic means being disposed adjacent said element and having flux paths passing directly through said element while being the sole magnetized bodies in said housing; and coil means mounted on said housing adjacent said element for excitation by a magnetic field induced in said element by said magnets.
Claim 2
Dependent Claim
110 words
A magnetic phonograph pickup comprising: a pickup housing; a stylus resiliently carried by said housing; a ferromagnetic element operatively connected with said stylus for joint movement therewith; magnetic means including at least two magnets mounteD on said housing adjacent said element and on opposite sides thereof, said magnets having similar magnetic poles turned toward said element, all of the magnets of said magnetic means being disposed adjacent said element and having flux paths passing directly through said element while being the sole magnetized bodies in said housing; and coil means mounted on said housing adjacent said element for excitation by a magnetic field induced in said element by said magnets.
Claim 3
Dependent Claim
29 words
The pickup defined in claim 1 wherein said magnets are coplanar and are arrayed symmetrically with respect to a plane of symmetry passing through said element and said stylus.
Claim 4
Dependent Claim
17 words
The pickup defined in claim 2 wherein said magnets lie substantially perpendicular to said plane of symmetry.
Claim 5
Dependent Claim
39 words
The pickup defined in claim 2, further comprising a third magnet adjacent said element and having a pole similar to said magnetic poles of the first mentioned magnets turned toward said element, said third magnet lying along said plane.
Claim 6
Dependent Claim
14 words
The pickup defined in claim 2 wherein said magnets are inclined to said plane.
Claim 7
Dependent Claim
20 words
The pickup defined in claim 5 wherein said magnets are elongated and include angles of about 30* with said plane.
Claim 8
Dependent Claim
13 words
The pickup defined in claim 1 wherein said element is a ferromagnetic tube.
Claim 9
Dependent Claim
26 words
The pickup defined in claim 7 wherein said housing comprises a nonmagnetic sleeve and a resilient washer therein, said tube being resiliently mounted in said washer.
Claim 10
Dependent Claim
48 words
The pickup defined in claim 1, wherein said housing comprises a pair of interfitting synthetic-resin blocks, said stylus being resiliently carried by one of said blocks, said pickup further comprising at least two elongated metallic bodies extending from said poles of said magnets to immediately adjacent said element.
Claim 11
Dependent Claim
21 words
The pickup defined in claim 1 wherein said element comprises a pair of substantially parallel ferromagnetic strips coupled with said stylus.
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) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |