Dynamic information storage or retrieval – With servo positioning of transducer assembly over track...
Patent
1981-10-30
1984-12-25
Cardillo, Jr., Raymond F.
Dynamic information storage or retrieval
With servo positioning of transducer assembly over track...
335234, 335256, 369126, G11B 906, G11B 2112, H01F 708
Patent
active
044908156
ABSTRACT:
An actuator for use in a pickup device for a video disk plunger having a cylindrical yoke made of a soft magnetic material, a pair of tubular solenoid coils disposed in said yoke such that the same polarity appears at adjacent portions thereof, and a movable element disposed axially movably inside of the tubular solenoid coils, the movable element having an axially magnetized permanent magnet and pole shoes attached to both ends of the permanent magnet. Dampers made of a resilient material such as a butyl rubber are secured to both ends of the yoke. The dampers support projections projected from both ends of the movable element such that the projections project axially outwardly of the dampers. A permanent magnet for magnetically attracting a stylus is secured to the outer end of one of the projections.
REFERENCES:
patent: 2435817 (1948-02-01), Boynton et al.
patent: 3135880 (1964-06-01), Olson et al.
patent: 3183410 (1965-11-01), Flora
patent: 3202886 (1965-08-01), Kramer
patent: 3504315 (1970-03-01), Stanwell
patent: 3593241 (1971-07-01), Ludwig
Matsumoto Norio
Umehara Teruo
Cardillo, Jr. Raymond F.
Hitachi Metals Ltd.
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