Stylus lifting/lowering actuator with improved electromagnetic m

Details Stylus lifting/lowering actuator with improved electromagnetic m Stylus lifting/lowering actuator with improved electromagnetic m

1979-11-28

1981-05-12

Haroian, Harry N.

Dynamic information storage or retrieval

Dynamic mechanism subsystem

Having power driven transducer assembly

369224, G11B 310

Patent

active

042667852

ABSTRACT:
A playback system for recovering prerecorded information from a disc record through the use of a stylus mounted on a stylus arm includes a stylus arm lifting-lowering device. The lifting-lowering device uses a permanent magnet mounted on a leaf spring. The permanent magnet is arranged to normally occupy the central volume of a core with a coil wrapped around the core. The leaf spring has an extension to receive the stylus arm. When an appropriate control signal is applied to the coil, a magnetic field is generated which tends to repell the magnet out of the central volume and the stylus arm, which rests on the extension, is gently lowered toward the record.

REFERENCES:
patent: 3952145 (1976-04-01), Allen
patent: 3972533 (1976-08-01), Huff
patent: 4030124 (1977-06-01), Allen
patent: 4053161 (1977-10-01), Bleazey et al.
patent: 4059277 (1977-11-01), DeStehanis

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