Disc reader with obliquity correction

Details Disc reader with obliquity correction Disc reader with obliquity correction

1985-06-26

1987-09-15

Richardson, Robert L.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 45, G11B 700

Patent

active

046944427

ABSTRACT:
An electro-optical device for recording and/or reading recording tracks in a recording surface of an optically readable disk by means of a radiation beam, includes a frame (43), a turntable supporting means (45) for a turntable (55) which is rotatable about an axis of rotation (57), an objective supporting means for an objective (15) having an optical axis (24), a focussing actuator (24) for moving the objective along the optical axis, and guide means for moving the objective and/or the turntable relative to each other between a first position, in which the optical axis and the axis of rotation are situated nearer each other, and a second position, in which these axes are situated more remote from each other. In the case of an oblique position of said surface of the disk, correction means reduce the angle between the optical axis and the normal to the disc surface at the location where the optical axis intersects the disk surface. The correction means includes a tilting device (63) for tilting the turntable supporting means and/or objective supporting means during recording and/or reading of the recording tracks about a pivotal axis (99) which extends at least substantially transversely of the plane defined by the optical axis and the axis of rotation and which, at least in the second position of the objective and the turntable, is situated between the axis of rotation and the optical axis.

REFERENCES:
patent: 4135206 (1979-01-01), Kleuters et al.
patent: 4502134 (1985-02-01), Kondo et al.
patent: 4607357 (1986-08-01), Okano
patent: 4608680 (1986-08-01), Yano
patent: 4634853 (1987-01-01), Kanamaru

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