45results about "Track shape" patented technology

An optical recording medium for accurately deriving the address information or the disc rotation control information despite narrow track pitch and for recording signals to a high density, and a method and apparatus for recording and / or reproducing such optical recording medium. The optical recording medium has a wobbled groove and pits formed at a pre-set interval in an area between turns of the wobbled groove. The recording / reproducing method includes controlling rotation of the optical recording medium by a wobbled signal from the groove and detecting the position on the optical recording medium of a recording signal by pit signals detected from the pits. The recording / reproducing apparatus includes a detection device for detecting the wobbled signal from the groove and a detection device for detecting pit signals from the pits. The rotation of the optical recording medium is controlled by the wobbled signals detected from the groove and the position on the optical recording medium of the recording signal is detected by the pit signal detected from the pits.

The present invention provides an optical disc recording method of irradiating an optical beam to an optical disc including a basal plate made of synthetic resin which has a concavo-convex pattern formed in advance on one surface thereof, and a reflective coat made of metal which is formed over the concavo-convex pattern on the basal plate, to physically change the concavo-convex pattern so as to record identification data.

An integral multiple of a period of wobbling in a portion other than address information of groove tracks (105, 107) is consistent with a length of one circumference of each of the groove tracks (105, 107), an integral multiple of a period of the address information is consistent with the length of one circumference of each of the groove tracks (105, 107), and pieces of information that differ between adjacent groove tracks (105, 107) among the address information is recorded by a predetermined wobble pattern which at least differs between the adjacent groove tracks (105, 107).

An optical disc medium includes a land and a groove at which information can be recorded. A predetermined number of address information units which record address information of the land or groove are provided in a circumferential direction of the optical disc medium. The address information unit of the land includes three or more address recording areas capable of recording address information. The address information is recorded on one area selected from among the three or more address recording areas. The address information unit of the land has address information which is recorded, in the same modulation, on the side of the inner adjacent groove and on the side of the outer adjacent groove. The one area to be selected from among the three or more address recording areas for recording the address information of the land is different among three address information units adjacently arranged in a radial direction.

An optical disc having marks for dispersed addresses that can be easily detected with high precision.A dispersed address comprises synchronization marks, positive marks, and negative marks. Synchronization marks, positive marks, and negative marks are formed along a groove as partial discontinuities or partial modifications in the wobbled groove.

The invention discloses an information recording medium and a disc. The information recording medium includes a plurality of wobbled tracks, in which a phase mismatch range of an adjacent wobble is a portion of a range of one track.

Provided is a CAV or a zone CAV. A groove which continuously wobbles is preliminary formed and information is recorded in the groove and a land adjacent to the groove, the groove has a first wobble part which is modulated by groove address information, a second wobble part which is modulated by address information of one adjacent land, and a third wobble part which is modulated by address information of the other adjacent land, a first section sandwiched between the second wobble parts of adjacent two grooves and a second section sandwiched between the third wobble parts of the adjacent two grooves are formed on the land, and one of phases of wobbles on both sides of the first section and phases of wobbles on both sides of the second section are substantially in-phase.

Provided is a CAV or a zone CAV. A groove which continuously wobbles is preliminary formed and information is recorded in the groove and a land adjacent to the groove, the groove has a first wobble part which is modulated by groove address information, a second wobble part which is modulated by address information of one adjacent land, and a third wobble part which is modulated by address information of the other adjacent land, a first section sandwiched between the second wobble parts of adjacent two grooves and a second section sandwiched between the third wobble parts of the adjacent two grooves are formed on the land, and one of phases of wobbles on both sides of the first section and phases of wobbles on both sides of the second section are substantially in-phase.

An optical disc having marks for dispersed addresses that can be easily detected with high precision. A dispersed address comprises synchronization marks, positive marks, and negative marks. Synchronization marks, positive marks, and negative marks are formed along a groove as partial discontinuities or partial modifications in the wobbled groove.

A high-density read-only optical disk. In the optical disk, plural grooves continuously forms a waveform manner along each track, providing plural information pits to the grooves and making possible to reproduce the information from the track pits which are narrower than the track pits of the optical disk having only information pits for every track.