Abstract:
This invention achieves high-density recording while preventing recording units from overlapping. Recording is done to form a gap between predetermined recording units. Since this gap is formed, even when a rotation driving mechanism of a medium suffers rotation nonuniformity, two neighboring recording units never overlap each other, and destruction of recording data can be prevented.
Abstract:
This invention achieves high-density recording while preventing recording units from overlapping. Recording is done to form a gap between predetermined recording units. Since this gap is formed, even when a rotation driving mechanism of a medium suffers rotation nonuniformity, two neighboring recording units never overlap each other, and destruction of recording data can be prevented.
Abstract:
This invention achieves high-density recording while preventing recording units from overlapping. Recording is done to form a gap between predetermined recording units. Since this gap is formed, even when a rotation driving mechanism of a medium suffers rotation nonuniformity, two neighboring recording units never overlap each other, and destruction of recording data can be prevented.
Abstract:
User data recording areas and intermediate areas are alternately arranged on a disk. The intermediate area records at least information for synchronization.
Abstract:
A method for forming an optical disk including, providing a substrate and an information recording layer on the substrate, and covering the information recording layer with a cover layer having light transmission properties such that a thickness t of the cover layer is determined based on a predetermined function f(n), which depends on a refractive index n of the cover layer, and the function f(n) is, f ( n ) = A 1 × n 3 ( n 2 - 1 ) × ( n 2 + A 2 ) ( n 2 + A 3 ) ( mm ) , in which, A1=0.049245, A2=−0.579135, and A3=0.012842, and constants t1 and t2 determine a range of the thickness t of the cover layer so that f(n)−t1
Abstract:
This invention achieves high-density recording while preventing recording units from overlapping. Recording is done to form a gap between predetermined recording units. Since this gap is formed, even when a rotation driving mechanism of a medium suffers rotation nonuniformity, two neighboring recording units never overlap each other, and destruction of recording data can be prevented.
Abstract:
This invention achieves high-density recording while preventing recording units from overlapping. Recording is done to form a gap between predetermined recording units. Since this gap is formed, even when a rotation driving mechanism of a medium suffers rotation nonuniformity, two neighboring recording units never overlap each other, and destruction of recording data can be prevented.
Abstract:
According to one embodiment, an optical pickup unit which can record, reproduction and erase information in/from an information recording medium has tracks with different pitches, the dividing means has at least a part of a dividing boundary line placing between an end of a 1st order diffraction light with the largest diffraction angle and an end of a 1st order diffraction light with the smallest diffraction angle of the reflected laser beam.
Abstract:
An information storage medium according to an embodiment of this invention includes a wobble track whose wobble period is modulated by multi-frequency shift keying corresponding to playback control information, wherein the playback control information contains header data and address data, and the header data contains a VFO area formed from a predetermined frequency.
Abstract:
An information storage medium (1) has tracks in which information is recorded. The tracks are formed as a groove section (2) and a land section (3). The groove section (2) has a synchronous structure in which wobbles (2a) and (2b) formed on both walls of the groove section (2) are not displaced from each other in the circumferential direction of the medium, and the land section (3) has an asynchronous structure in which wobbles formed on both sides of the land section (3) are displaced from each other. A good signal is reproduced from each of the groove and land sections.