Integrated optical head structure

Details Integrated optical head structure Integrated optical head structure

1991-10-28

1993-06-08

Sniezek, Andrew L.

Dynamic information storage or retrieval

With servo positioning of transducer assembly over track...

Optical servo system

369 4423, 369112, G11B 700

Patent

active

052185842

ABSTRACT:
A semiconductor optical head structure for accessing storage locations on an optical storage medium, such as an optical disk, for writing, erasing, and reading of information, including tracking-error detection and focusing-error detection systems is taught. Both error detection systems are optically and electrically separated to avoid any mutual inter- ference of the error signals, and all optical elements of the optical head are integrated on one chip. The focusing-error signal is generated by deflecting a separate beam (20A) out of an optical head and focusing it onto the surface of an optical disk and detecting the reflected portion thereof. The separate readout and tracking-error signal is generated by employing a light beam which is focused on the center of the pits of a track and detecting the diffracted portion thereof. Focusing-errors can be reduced by actuating the head perpendicular to the disk using a coil. If a tracking-error is measured, the head can be moved using an actuator, until the error is minimized. The required optical head can be grown on a compound semiconductor material, such as GaAs, using planar fabrication technology.

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