Patent US4138122A successfully refreshed from Google Patents.
US4138122A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pickup
Assignee: ORTOFON Manufacturing AS
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Filing: 1977-06-20
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Granted: 1979-02-06
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Expires: 1997-06-20
Abstract
Abstract A phonograph pickup having an armature supported by a resilient pad which restores the armature to a neutral position after excursions thereof. A further resilient means is provided, which engages the armature at a greater distance from its fulcrum than does the pad. The additional resilient means is made of a material having good damping characteristics.
Inventors
- 👤 Hisayoshi Nakatsuka
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 17:21
CPC Classifications
H; H04; H04R; H04R1/00; H04R1/16; H04R9/00; H04R9/12; H04R9/16
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
152 words
A pickup of the type having a stationary pole leg with one end of a wire secured thereto and the other end affixed to the movable system of the pickup, comprising a stylus arm having a stylus affixed at the front end and the other end of said wire affixed to the rear end and also having an armature secured to the rear end of said stylus arm for defining a fulcrum of said movable system, said armature being supported by a resilient bearing means engaging on one side with a central portion of said armature and on the other side with said stationary pole leg, characterized in that there is further provided one or more resilient elements supported by said stationary pole leg for engaging with said movable system at a greater distance from said stationary pole leg than said fulcrum and with a lower pressure than said resilient bearing means.
Claim 2
Dependent Claim
152 words
A pickup of the type having a stationary pole leg with one end of a wire secured thereto and the other end affixed to the movable system of the pickup, comprising a stylus arm having a stylus affixed at the front end and the other end of said wire affixed to the rear end and also having an armature secured to the rear end of said stylus arm for defining a fulcrum of said movable system, said armature being supported by a resilient bearing means engaging on one side with a central portion of said armature and on the other side with said stationary pole leg, characterized in that there is further provided one or more resilient elements supported by said stationary pole leg for engaging with said movable system at a greater distance from said stationary pole leg than said fulcrum and with a lower pressure than said resilient bearing means.
Claim 3
Dependent Claim
27 words
A pickup according to claim 1, characterized in that the one or more resilient elements consist of relatively soft synthetic rubber having a relatively high attenuation effect.
Claim 4
Dependent Claim
41 words
A pickup according to claim 1, characterized in that one of said one or more resilient elements is formed as a sleeve engaging at one end with portions of the armature and at the opposite end with said stationary pole leg.
Claim 5
Dependent Claim
30 words
A pickup according to claim 3, characterized in that the sleeve is provided on its inner face with a peripheral flange against which the edge portions of the armature abut.
Claim 6
Dependent Claim
31 words
A pickup according to claim 4, characterized in that the upper face of the flange extends in a plane forming an angle of slightly less than 90° with the sleeve axis.
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) | 1982-02-05 | 1982-08-07 | 1983-02-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-02-05 | 1986-08-07 | 1987-02-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-02-05 | 1990-08-07 | 1991-02-06 | $7700.00 | Window Closed / Lapsed |