Optical information recording/reproducing method and apparatus i

Details Optical information recording/reproducing method and apparatus i Optical information recording/reproducing method and apparatus i

1994-04-15

1996-09-17

Epps, Georgia Y.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369112, 369 4437, 369 4438, 369 4441, G11B 700

Patent

active

055576010

ABSTRACT:
An optical information recording and/or reproducing apparatus includes an optical system for letting first and second optical beams pass through substantially the same optical path to form first and second optical spots on the same information track on a surface of an information recording medium and for guiding reflected light from the surface of the information recording medium to photo sensors to detect recorded information in the information recording medium. The first optical spot is used for focusing error detection, tracking error detection, erasing of old information, and recording of new information. The second optical spot is used both for reproduction-while-recording of newly recorded information and for normal reproduction of recorded information. The first optical spot advances and the second optical spot follows on a moving information track.

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