Write once optical disc recording apparatus with reduced data er

Details Write once optical disc recording apparatus with reduced data er Write once optical disc recording apparatus with reduced data er

1995-05-26

1996-10-08

Psitos, Aristotelis

Dynamic information storage or retrieval

Condition indicating, monitoring, or testing

Including radiation storage or retrieval

369 58, G11B 700

Patent

active

055638627

ABSTRACT:
An apparatus for recording data signals onto an optical recording medium is disclosed. The apparatus includes a unit for radiating a laser beam onto the optical recording medium, a photo-electric converting unit for converting the laser beam reflected from the optical recording medium into an electrical signal, a first detection unit for detecting whether or not the data signals are recorded on the optical recording medium, a second detection unit for detecting a value of asymmetry based upon an output of the photo-electric converting unit, and a control unit for detecting, prior to recording of the data signals on the optical recording medium, whether or not the data signals are recorded in a region proximate to a region of the optical recording medium in which the data signals are to be recorded. The control unit sets a value of asymmetry detected by the second detection unit based on the data signal reproduced from the proximate region as being a target value of asymmetry when the data signals are recorded in the proximate region. The control unit also sets a predetermined value of asymmetry as the target value of asymmetry when data signals are not recorded in the proximate region.

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