Linear actuator for an optical disk storage apparatus

Details Linear actuator for an optical disk storage apparatus Linear actuator for an optical disk storage apparatus

1986-08-13

1988-08-09

Shoop, Jr., William M.

Dynamic information storage or retrieval

Dynamic mechanism subsystem

Specified detail of transducer assembly support structure

369215, 369 43, G11B 1700

Patent

active

047633140

ABSTRACT:
A linear actuator for controlling access to a track element belonging to a plurality of adjacent track elements arranged in a reference surface of an optical disk rotatable about a spindle. The linear actuator includes an objective lens for projecting a light spot for interaction with a selected one of the track elements. A first moving mechanism is provided for supporting the objective lens for movement along a first direction substantially perpendicular to the reference surface for controlling the focusing of the light spot. A second moving mechanism in the linear actuator supports the objective lens for movement along a second direction substantially parallel to the reference surface and generally transverse to the track elements for controlling the access thereto. The second moving mechanism includes a pair of spaced apart, parallel rods which extend generally transverse to the track elements. The rods have a round cross-section and are made of a ferromagnetic material. The objective lens is supported by a carriage which is engaged with the rods for movement along the same. A pair of round actuator coils are connected to the carriage and surround corresponding ones of the rods for linear movement along the same. Each rod is partially surrounded by a generally C-shaped radially polarized permanent magnet so as not to obstruct movement of the carriage along the rod. A return flux path is provided adjacent each of the magnets.

REFERENCES:
patent: 3254897 (1966-06-01), Holmes
patent: 4386823 (1983-06-01), Musha
patent: 4414594 (1983-11-01), Farmer et al.
patent: 4504935 (1985-03-01), Jansen
patent: 4554653 (1985-11-01), Malissin et al.
patent: 4561081 (1985-12-01), Janssen et al.
patent: 4613962 (1986-09-01), Inoue et al.
patent: 4698798 (1987-10-01), Faber et al.

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