Patent US3576955A successfully refreshed from Google Patents.
US3576955A
Expired / Lapsed
US
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Armature assembly for magnetic-type phonograph pickup
Assignee: Panasonic Holdings Corp
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Filing: 1968-08-16
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Granted: 1971-05-04
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Expires: 1988-08-16
Abstract
Abstract An armature assembly for a magnetic-type phonograph pickup having a cord or wire which supports a stylus arm with a magnet mounted thereon, the armature, being supported by the aid of the bending of the cord or wire at one stable point to vibrate uniformly in every direction at that point; and a bearing member of elastic material the compression of which can be adjusted so that at the peak the resonant frequency of the output voltage can be damped, such that the frequency response characteristic of the output voltage can be flattened.
Inventors
- 👤 Shuichi Obata
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 15:18
CPC Classifications
H; H04; H04R; H04R11/00; H04R11/08; H04R11/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
158 words
An armature assembly for a magnetic-type phonograph pickup comprising a stylus arm, a stylus mounted on one end of said stylus arm, a magnet having a high coercive force fixed to another end of said stylus arm in coaxial relation with said stylus arm, a flexible wire extending at one end into said stylus arm through a central portion of said magnet for supporting said stylus arm thereon, spacer means disposed in spaced relation to said magnet, said spacer means fixedly holding another end portion of said supporting wire, a member having a longitudinal bore passing therethrough in which said spacer means is slidably inserted, and an elastic member mounted, in overhanging relationship on one end portion of said spacer means, adjacent to said magnet for damping a vibration of said magnet, a variation in magnetic flux produced by said vibration of said magnet being detected by coils and converted into an electrical signal as an output voltage.
Claim 2
Dependent Claim
158 words
An armature assembly for a magnetic-type phonograph pickup comprising a stylus arm, a stylus mounted on one end of said stylus arm, a magnet having a high coercive force fixed to another end of said stylus arm in coaxial relation with said stylus arm, a flexible wire extending at one end into said stylus arm through a central portion of said magnet for supporting said stylus arm thereon, spacer means disposed in spaced relation to said magnet, said spacer means fixedly holding another end portion of said supporting wire, a member having a longitudinal bore passing therethrough in which said spacer means is slidably inserted, and an elastic member mounted, in overhanging relationship on one end portion of said spacer means, adjacent to said magnet for damping a vibration of said magnet, a variation in magnetic flux produced by said vibration of said magnet being detected by coils and converted into an electrical signal as an output voltage.
Claim 3
Dependent Claim
23 words
An armature assembly for magnetic-type phonograph pickup according to claim 1, wherein said spacer means is fixed in the position by a setscrew.
Claim 4
Dependent Claim
24 words
An armature assembly for magnetic-type phonograph pickup according to claim 1, wherein said spacer means is fixed in the position by a cementing material.
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) | 1974-05-03 | 1974-11-02 | 1975-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-03 | 1978-11-02 | 1979-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-03 | 1982-11-02 | 1983-05-04 | $7700.00 | Window Closed / Lapsed |