摘要:
An optical disk including first information layer having first guide grooves consisting of first protrusive flat portion having first width and first recessed flat portion having a second width having first height difference from the first protrusive flat portion, the first information layer being formed on the transparent substrate layer, second information layer having second guide grooves consisting of second protrusive flat portion having third width formed on second recessed flat portion having fourth width having second height difference, the second information layer, wherein cycle P (μm) of the first and second guide grooves has value ranging from 0.35 μm to 0.8 μm and has relationship of Q1=2Z1/(P−X1−Y1), Q2=2Z2/(P−X2−Y2), 0.9
摘要:
An optical disk has transparent substrate layer provided at light incidence side, first information layer which has first groove of first depth, adhesive layer provided on the first information layer, and second information layer which has second groove of second depth that is deeper than the first depth, and irreversibly records information therein, wherein the first depth and the second depth are λ/2n or less, the width of the first and second grooves is 0.3 μm or less, the track pitch of the first and second grooves is 0.45 μm or less, the first and second information layers include organic dye material having light absorption in the range of the wavelength λ of laser beam for use in recording and reproducing information from 390 nm to 420 nm.
摘要:
According to one embodiment, an information recording medium has two or more recording layers, the track pitch falls within the range from 250 to 500 nm, and the half maximum full-width of the groove of the substrate falls within the range from 47.5% to 72.5%.
摘要:
An optical disk including a substrate and a recording film formed on the surface of the substrate, wherein the recording film includes an information recording domain. A servo information for a tracking control and a format condition information for formatting the information recording domain are provided on the substrate, and the information recording domain is formatted in accordance with the format condition information.
摘要:
A primary optical disk recording apparatus comprises a first light source for recording a signal on a primary optical disk, an objective lens for converging a light beam from the first light source on the primary optical disk, a second light source for detecting a focus error between the objective lens and the primary optical disk, and a controller for detecting a reflection light beam from the first light source, which is reflected from the primary optical disk, while the signal is being recorded on the primary optical disk, and for subjecting a signal of the reflection beam to an arithmetic operation process, thereby detecting a first focus error signal and controlling the focus error on the basis of the first focus error signal.
摘要:
In order to stably carry out reproduction of information in an optical disc medium (10) using a PRML (partial-response maximum-likelihood) method for reproducing the signal, the optical disc medium (10) has not only a data recording area (14) where data is recorded at high density but also a system information recording area (16) where information is recorded at low density and binary equalizing/reproducing can be easily made. Information required to circuit setting is recorded in the system information recording area.
摘要:
Header regions are formed by dividing a groove or grooves. Each of the header regions is provided with two ID sections G-ID1, G-ID2 storing address information and a track center detection mark section, arranged between the two ID sections, so as to be used for detecting the track center.
摘要:
An information recording medium has a recording track, a plurality of address areas which are formed on the recording track and record address information, and mark areas, the number of which is larger than the number of address areas, and which are formed at predetermined intervals and include mark information. Each address area records address information by means of pits, and each mark area records mark information by means of wobbles as a part of a track boundary.
摘要:
An optical disk comprises a mark train, which has at least one shortest mark and at least one other mark, recording readable information by applying a light beam, wherein the shortest mark of the mark train have a width larger than that of the other mark.
摘要:
An optical disk has first and second substrates, at least one of which is provided with optically readable pits corresponding to record data, and a reflection film coated on the pits. In the optical disk, the first and second substrates are laminated on each other such that the surface on which the pits are formed, is located inside. Label information, indicative of the record data, is formed on at least one of the surfaces of the first and second substrates, which contact each other.