Rewritable optical recording medium and optical recording method

• Main Author: HORIE MICHIKAZU,KUBO MASAE,MIZUNO MASAAKI,OHNO TAKASHI,OKAMURO AKIO,HOSHINO HIROYUKI
• Format: Patent
• Language: Chinese; English
• Published: 25.08.2004
• Edition: 7
• Subjects: GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; INFORMATION STORAGE; INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER; PHYSICS; TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION; TECHNICAL SUBJECTS COVERED BY FORMER USPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS

提供维持与已有CD-RW标准和可改写DVD标准的互换性并且同时能进行24倍速以上高速记录的CD-RW和能进行6倍速以上高速记录的可改写DVD及其记录方法。其中可改写光记录媒体具有衬底和相变型记录层，将晶态部分作为未记录状态/擦除状态，非晶部分作为记录状态，用于通过在该纹道内照射记录光，形成非晶态传号体，记录EFM调制信息。该可改写光记录媒体的特征在于，将线速1.2m/s～1.4m/s作为基准速度(1倍速)时，基准速度的24倍速或32倍速下，通过数值孔径NA＝0.5或NA＝0.55的光学系统照射波长780nm的记录光进行记录时，记录信号的调制度m11为60％～80％，眼图的反射率上端值Rtop为15％～25％，而且抖动为35nsec以下。 The present invention provides CD-RW which makes high velocity recording at a level of at least 24-times velocity possible, rewritable DVD which makes high velocity recording at a level of at least 6-times velocity possible, and a recording method therefor, while maintaining interchangeability with conventional CD-RW standards and rewritable DVD standards. A rewritable optical recording medium comprising a substrate and a phase-change type recording layer, wherein a portion in a crystalline state corresponds to an unrecorded or erased state, and a portion in an amorphous state correspond to a recorded state, to record EFM modulated information by forming amorphous marks by irradiating the recording layer with a recording laser beam, and wherein recording is carried out by irradiating a recording laser beam having a wavelength of about 780 nm through an optical system having a numerical aperture NA of 0.5 or 0.55, at 24-times velocity or 32-times velocity of the reference velocity, where the reference velocity (1-time velocity) is a linear velocity of from 1.2 m/s to 1.4 m/s, modulation m11 of record signals is from 60% to 80%, the top value Rtop of the reflectivity of the high pattern is from 15% to 25%, and jitters are at most 35 nsec.