Abstract:
PROBLEM TO BE SOLVED: To make a disk format with high format efficiency. SOLUTION: An optical recording medium has a plurality of identifiers in association with address information formed thereon, wherein: each identifier is provided on the optical recording medium; and each identifier comprises at least one of: a first pattern provided on the optical recording medium and representing a first code expressed by one bit; a second pattern provided on the optical recording medium and representing a second code expressed by one bit; and a third pattern provided on the optical recording medium and representing a third code expressed by one bit. An optical playback device plays back information recorded on the optical recording medium and includes: a semiconductor laser for applying a light spot obtained by converging a light beam onto the optical recording medium; a light detection means for receiving the light beam reflected from the optical recording medium, and outputting a voltage signal corresponding to the amount of the reflected light beam; and an address detection means for detecting the address information on the basis of the voltage signal output from the light detection section. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To reduce time required to reproduce a disk information area. SOLUTION: An information recording medium has a plurality of recording layers. Each of the plurality of recording layers includes a test area for determining the recording power of laser light, a first buffer area adjacent to an inner end of the test area, a second buffer area adjacent to an outer end of the test area, a first defect list area provided to an inner periphery area of the first buffer area, a second defect list area which is provided to an outer periphery area of the second buffer area and in which the same data as that in the first defect list area is recorded, a spare area provided to the outer periphery area of the second defect list area, and a data area provided to the outer periphery area of the spare area. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide an optical storage medium and an optical information apparatus that can record or reproduce data with high reliability even when using an optical storage medium in which jitter from the shortest marks and spaces is worse than jitter from marks and spaces longer than the shortest marks and spaces. SOLUTION: This optical information apparatus has an optical pickup head that emits a light beam to the optical storage medium, detects the light beam reflected from the optical storage medium, and outputs a signal based on the received reflected light, a jitter measuring unit for measuring jitter in signals output from the optical pickup head and an evaluation unit for determining from the measured jitter if the optical storage medium is good or defective. The jitter measuring unit measures jitter in a train of 3T or longer marks or spaces from an optical storage medium to which digital information is recorded as a train of marks or spaces of length kT based on a period T and an integer k of two or more. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To prevent the time required for startup of a recording/playback apparatus from being increased even when there are both disks having a recording groove track a recording land track. SOLUTION: In an optical disk 101, information is recorded on a groove track, and in an optical disk 107, information is recorded on a land track. The optical disk 101 has a control data area 102, and a data recording area 103 in which user data is recorded. The optical disk 107 has a control data area 108, and a data recording area 109 in which user data is recorded. A code for indicating a track to be subjected to tracking servo is provided both in the control data area 102 of the optical disk 101, and in the control data area 108 of the optical disk 107. COPYRIGHT: (C)2009,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide an optical disk, along with an optical disk device or the like, wherein the number of overhead suitable for video recording is reduced as much as possible. SOLUTION: The optical disk medium includes a plurality of sector groups each including a plurality of sectors connected in the circumferential direction of a track. Position information indicating the position of at least part of the plurality of sector groups on an optical disk is divided into a plurality of information parts to be dispersed in a plurality of associated sectors on the same track. The position information is represented by a plurality of identification marks. Each of the plurality of identification marks takes one of three different states. One of synchronous signal, or 1-bit information of 1 or 0 is indicated by the three different states. The number of sectors constituting the sector group is an integral multiple of the number of sectors constituting a sector block for performing logical processing. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To prevent an increase of time for activating a device even when there are two disks: disk that performs recording in a groove track and disk that performs recording in a land track. SOLUTION: An optical disk 101 is a type of an optical disk that performs recording in the groove track, and an optical disk 107 is a type of an optical disk that performs recording in the land track. Each of the optical disks 101 and 107 has control data areas 102 and 108, and data recording areas 103 and 109 for recording user data. In any of the optical disks 101 and 107, a code showing a track to which tracking servo should be applied is recorded in the control data areas 102 and 108. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a recording and reproducing device to record or reproduce data on an information recording medium (101). SOLUTION: The recording and reproducing device (1) has a means to read a first data from a first predetermined position in the data recording area of an information recording medium (101), a means to check whether or not the first data is coincident with the first kind information showing the kind of a first predetermined file system, a means to record or reproduce data by using the first predetermined file system when both are coincident, a means to read the second data from the second predetermined position in the data recording area when both are not coincident, a means to check whether the second data is coincident with the second kind information showing the kind of the second predetermined file system different from the first predetermined file system, and a means to record or reproduce data by using the second predetermined file system when both agree. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide an optical storage medium and optical information device that can record or reproduce data with high reliability even when using an optical storage medium in which jitter from the shortest marks and spaces is worse than jitter from marks and spaces longer than the shortest marks and spaces. SOLUTION: The optical information device has an optical pickup head that emits a light beam to the optical storage medium, detects the light beam reflected from the optical storage medium, and outputs a signal based on the received reflected light, a jitter measuring unit for measuring jitter in signals outputted from the optical pickup head and an evaluation unit for determining from the measured jitter if the optical storage medium is good or defective. The jitter measuring unit measures jitter in a train of 3T or longer marks or spaces from an optical storage medium to which digital information is recorded as a train of marks or spaces of length kT based on a period T and an integer k of two or more. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide a recording medium which stably performs data recording and reproduction even at the start and end of data recording. SOLUTION: The recording medium 101 includes a recording area 102. The recording area 102 includes a first area and a second area 201. The first area includes a frame area 202. The frame area 202 includes an area to which a second synchronous code system SY pattern and at least part of data are recorded. The second area includes an area to which a third synchronous code system PA pattern and a fourth synchronous code system 2101 are recorded. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide an optical data recording method optically recording data correctly even at a high transfer rate. SOLUTION: The optical data recording method mark includes a first pulse for forming a leading edge of a recording mark, a last pulse for forming a trailing edge, and a multi-pulse train for forming a center of the recording mark disposed between the first pulse and the last pulse. The multi-pulse train has a pulse period longer than T which represents a reference period of the recording modulation code. COPYRIGHT: (C)2009,JPO&INPIT