Driver for an objective of an optical scanning unit

Details Driver for an objective of an optical scanning unit Driver for an objective of an optical scanning unit

1986-07-24

1988-11-08

Richardson, Robert L.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

250201, 369 45, G11B 700

Patent

active

047837756

ABSTRACT:
An optical scanning unit with an objective for the focussing a beam of radiation along an optical axis into a scanning spot on the surface of an information carrier. The scanning unit also has an electromagnetic drive for correcting the position of the objective with respect to the information carrier. The drive has an objective mount supported in an annular, moving magnetic member which is axially magnetized and is arranged coaxially about the optical axis. The drive is further provided with fixed coils which interact with the magnetic member via an air gap. The fixed coils are arranged along at least three radial planes which are normal to the optical axis. Two planes lie in the area of the axial ends of the centrally positioned magnetic member and the third central plane which extends between the two outer radial planes.

REFERENCES:
patent: 4490011 (1984-12-01), Houbregs et al.
patent: 4643522 (1987-02-01), Takashima
patent: 4658390 (1987-04-01), Fujii et al.

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