Objective lens driving device for tracking and focus corrections

Details Objective lens driving device for tracking and focus corrections Objective lens driving device for tracking and focus corrections

1980-12-15

1983-10-04

Cardillo, Jr., Raymond F.

Dynamic information storage or retrieval

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

Mechanism control by the control signal

369 44, G11B 712

Patent

active

044083130

ABSTRACT:
An objective lens driving device useable in an information reading-out apparatus for projecting a light spot onto a record medium which has been spirally or concentrically recorded with one or more information tracks and for reading-out the information, which drives the objective lens in a direction perpendicular to its optical axis and the information track, thereby correcting relative positional error, i.e. tracking error, between the information track and the light spot. It comprises at least one set of objective lens driving means, each set including a movable member movable together with the objective lens, a coil wound around a stationary yoke, and an objective lens supporting means for movably supporting the objective lens in a direction perpendicular to the optical axis of the objective lens and information track, said coil being supplied with an electric current corresponding to a tracking error signal representing the relative positional error so as to displace the movable member and objective lens and information track and thereby to correct the tracking error.

REFERENCES:
patent: 4239942 (1980-12-01), Van Alem et al.
patent: 4253126 (1981-02-01), Kuribayashi et al.
patent: 4302830 (1981-11-01), Hamaoka et al.

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