Scanning head for an optical disc system

Dynamic information storage or retrieval – Control of storage or retrieval operation by a control... – Mechanism control by the control signal

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369112, G11B 712

Patent

active

043375316

ABSTRACT:
In a scanning head for an optical disc system, a light beam from a laser is transmitted through a monomode optical fiber and then focussed on a record carrying surface of an optical disc by a converging lens. The end of the fiber can be reoriented within orthogonal planes perpendicular to the plane of the record carrying surface by transducers so as to correct for tracking and timing errors. The laser diode can function both as an emitter and, in an external cavity mode, as a detector of light reflected from the disc. Drive to the transducers is dependent on tracking and speed error signals generated from the detected light. For tracking and speed error compensation, only lens fiber end, and, optionally, a collimating lens, which are of negligible weight, need be moved rather than the entire scanning head. This provides a simple structure having a high frequency response and low power consumption.

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patent: 4135083 (1979-01-01), Van Alem et al.
patent: 4135206 (1979-01-01), Kleuters et al.
patent: 4193091 (1980-03-01), Kleuters et al.

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