Objective lens driving apparatus

Details Objective lens driving apparatus Objective lens driving apparatus

1990-07-16

1993-06-29

Brier, Jeffery A.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4432, 369 4425, G11B 700

Patent

active

052240835

ABSTRACT:
From the start of descending of a disk-shaped recording medium in a direction of approaching an objective lens in the optical axis direction by a loading mechanism until it is set at a specified position with respect to a spindle motor, a DC current is supplied to an optical axis direction driving coil through an evading current feeding circuit in a direction for a movable part to depart from the disk-shaped recording medium, and the movable part is located at the remotest position from the disk-shaped recording medium due to an electromagnetic force generated by the DC current flowing in the optical axis direction driving coil and a permanent magnet, so that the disk-shaped recording medium and the objective lens will not collide against each other even if an objective lens with a short working distance is used.

REFERENCES:
patent: 4680744 (1987-07-01), Kanamaru
patent: 4954904 (1990-09-01), Goor
patent: 5036507 (1991-07-01), Yamashita
patent: 5090000 (1992-08-01), Nozu et al.
patent: 5140575 (1992-08-01), Fushiki

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