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Optical information recording/reproducing method and apparatus in which a first optical spot performs focusing, tracking, erasing and recording and a second optical spot performs two reproducing modes
Optical information recording/reproducing method and apparatus in which a first optical spot performs focusing, tracking, erasing and recording and a second optical spot performs two reproducing modes
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机译:光信息记录/再现方法和装置,其中第一光点执行聚焦,跟踪,擦除和记录,第二光点执行两种再现模式
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摘要
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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