Optical recording and playback unit

Details Optical recording and playback unit Optical recording and playback unit

1982-11-17

1985-11-26

Richardson, Robert L.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

369 45, 369 44, 250201, G11B 712

Patent

active

045557802

ABSTRACT:
A bobbin which supports at least optical lens includes a portion on which two or three coils are disposed. Each of the coils disposed on the bobbin portion is wound thereon at a given finite angle with respect to the center axis of the bobbin, at least one such angle being non-perpendicular to the central axis, and the coils form together a composite coil assembly. A magnetic circuit includes a gap and defines a magnetic flux in the region of the gap which passes through the composite coil assembly in a direction substantially perpendicular to the center axis of the bobbin. Support means support the bobbin within the gap of the magnetic circuit so it is freely movable. By controlling the current passed through each coil, the location of the bobbin is adjusted, thus adjusting the position of the optical lens with respect to a disc.

REFERENCES:
patent: 4386823 (1983-06-01), Musha
patent: 4408313 (1983-10-01), Musha
patent: 4462096 (1984-07-01), Kusaka

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