Patent ID: 6747935
Filing Date: 2004-06-08
Classification: G11B

Abstract:
An optical information recording and reproducing device for recording information, consisting of at least a pulse having a length of N times (N is an integer greater than or equal to 1) a channel clock cycle T, on a recording medium with a laser beam from a semiconductor laser light source based on a predetermined recording modulation method, said laser light source emitting multi-pulse emissions of a predetermined emitting rule, mark/space information being recorded and reproduced on said recording medium by laser power of at least two values of bias level/peak level;wherein said device comprises a plurality of pulse width setting registers for setting pulse width of said multi-pulse emissions, wherein said pulse width setting register is changed and then recording operation is performed when updating said pulse width of multi-pulse emissions, and at a time of changing said pulse width setting registers during recording, recording pulse train generation is stopped.