Objective lens drive device with tracking error correction with

Details Objective lens drive device with tracking error correction with Objective lens drive device with tracking error correction with

1981-08-25

1985-03-26

Cardillo, Jr., Raymond F.

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

350247, 350255, 369 44, G11B 712, G02B 702, G02B 711

Patent

active

045077649

ABSTRACT:
An objective lens drive device for driving an objective lens comprises an objective lens drive mechanism arranged at both sides of the objective lens for flanking the objective lens in the direction of displacement of the objective lens. The objective lens drive mechanism comprises an objective lens supporting mechanism at opposite sides of the objective lens and being bent perpendicularly to the optical axis of the objective lens and a data track and which displaceably support the objective lens in the perpendicular direction, movable magnetic bodies associated with respective lens supporting mechanisms at opposite sides of the objective lens and which move with the objective lens, first and second stationary yokes which flank the movable magnetic bodies perpendicularly to the direction of displacement, and first and second coils which are wound around the first and second stationary yokes, respectively for generating a magnetic field passing through the first and second stationary yokes and said movable members. The distribution of the magnetic field of said objective lens drive mechanism is made symmetrical about the optical axis of the objective lens and a current corresponding to a tracking error signal which represents the relative misalignment is supplied to said first and second coils of the respective objective lens drive mechanism.

REFERENCES:
patent: 4302830 (1981-11-01), Hamaoka et al.
patent: 4386823 (1983-06-01), Musha

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