Method and apparatus for detecting focussing and tracking error

Details Method and apparatus for detecting focussing and tracking error Method and apparatus for detecting focussing and tracking error

1981-10-07

1985-06-25

Cardillo, Jr., Raymond F.

Dynamic information storage or retrieval

Control of storage or retrieval operation by a control...

Mechanism control by the control signal

369 46, 369109, 369110, G11B 708

Patent

active

045258252

ABSTRACT:
A method and an apparatus for detecting a focussing error signal and a tracking error signal of an objective lens with respect to an information track of a video disc on which a reading light spot is focussed by the objective lens includes a detection prism having a reflection surface which is set substantially at a critical angle and a light detector for receiving the light flux reflected by the reflection surface. The light detector is arranged in a far field of the track and having four light receiving regions divided along two orthogonal directions. The focussing error signal is derived as a difference between output signals from the regions aligned in a track direction and the tracking error signal is derived as a difference between output signals from the regions aligned in a direction perpendicular to the track direction. An information signal is obtained as a sum of the output signals from the four regions.

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patent: 4334300 (1982-06-01), Arquie et al.
patent: 4358200 (1982-11-01), Heemskerk et al.
patent: 4390781 (1983-06-01), Musha

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