Lens position-sensing apparatus for optical recording system

Details Lens position-sensing apparatus for optical recording system Lens position-sensing apparatus for optical recording system

1987-05-18

1989-08-08

Faber, Alan

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 32, 369 54, 369 55, G11B 7095

Patent

active

048559822

ABSTRACT:
Apparatus for sensing the instantaneous tracking position of a lens used in an optical read/write head for optically reading and/or writing information on an optical recording element (e.g. an optical disk). Such apparatus includes a variable inductance transducer which is positioned in close proximity to an electrically conductive, movably mounted lens support. As the lens is moved in a direction perpendicular to its optical axis, the lens support moves relative to the transducer, thereby varying the transducer's inductance. Circuit means responsive to the instantaneous transducer inductance provides a signal representative of the instantaneous lens position. Such signal is used to close a position feedback loop which maintains a fixed position of the lens axis relative to the optical axis of the head during sudden movements of the head (e.g. as occurs in during radial access in an optical disk recording system).

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patent: 4327434 (1982-04-01), Christopher
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patent: 4419614 (1983-12-01), Kimura
patent: 4607355 (1986-08-01), Koide
patent: 4677602 (1987-06-01), Okano et al.
patent: 4773055 (1988-09-01), Gijzen et al.

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