Double solenoid focus actuator for optical recording/playback ap

Details Double solenoid focus actuator for optical recording/playback ap Double solenoid focus actuator for optical recording/playback ap

1991-08-16

1992-04-21

Shoop, Jr., William M.

Dynamic information storage or retrieval

Dynamic mechanism subsystem

Specified detail of transducer assembly support structure

369 4422, 369 4421, G11B 709

Patent

active

051074850

ABSTRACT:
A focus actuator for controlling the focal position of an objective lens used in an optical recording system to maintain a write/read laser beam in focus on a moving optical recording element. In a preferred embodiment, such actuator comprises a pair of juxtaposed coils which concentrically surround a ferromagnetic cylindrical member of low coercivity (e.g. soft iron). The cylindrical member, in turn, is concentrically arranged with respect to the objective lens and is rigidly coupled thereto. When current is applied to one coil or the other, the cylindrical member (and its coupled lens) move along the optical axis of the lens, in one direction or the other, depending on which of the coils is receiving current. Preferably, the cylindrical member is supported for movenent within the coils by a pair of flexure blades. A particularly important advantage over similar devices of the prior art is that the focus actuator of the invention requires no permanent magnet.

REFERENCES:
patent: 3946166 (1976-03-01), Wosidlo
patent: 4561381 (1985-12-01), Janssen et al.
patent: 4571026 (1986-02-01), Maruta
patent: 4664476 (1987-05-01), Kasuga
patent: 4782475 (1988-11-01), Chandler
patent: 4817076 (1989-03-01), Van Sluys et al.

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