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 information recording medium which includes three or more information recording layers in which information can be recorded under proper conditions, and to provide an information recording device.SOLUTION: The information recording medium has n (n is an integer of three or more) layers that are stacked together. Each information recording layer has a test recording area for determining the recording power of a laser beam. As counted from the information recording layer farthest from the incident surface with respect to the laser beam, a difference in radial position between the outer circumferential end of a test recording area disposed closer to the inner circumference and the inner circumferential end of a test recording area disposed closer to the outer circumference out of the test recording areas of an i-th information recording layer and an i+1th information recording layer (i is an integer that satisfies 2≤i≤n-1) is greater than a difference in radial position between the outer circumferential end of a test recording area disposed closer to the inner circumference and the inner circumferential end of a test recording area disposed closer to the outer circumference out of the test recording areas of a j-th information recording layer and a j+1th information recording layer (j is an integer that satisfies 1≤j≤i-1).
Abstract:
PROBLEM TO BE SOLVED: To provide an optical storage medium and an optical information device, capable of recording/reproducing information with high reliability, even when an optical storage medium is used, wherein jitters regarding a shortest mark and space are worse than jitters regarding a mark and space longer than the shortest mark and space. SOLUTION: The optical information device includes: an optical pickup head for irradiating the optical storage medium with an optical beam to receive the optical beam reflected from the optical storage medium, and for output of a signal based on the received optical beam; a jitter measurement unit for measuring jitters of the signal output from the optical pickup head; and a decision unit for determining whether the optical storage medium is defective based on the measured jitters. The jitter measurement unit measures jitters for ≥3T mark 903 or a space row for the optical storage medium wherein digital information is recorded as a kT mark or space based on an integer k of ≥2 and a cycle T. COPYRIGHT: (C)2010,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To minimize influence of a test record in an OPC area of one information recording layer on OPC areas of the other information recording layers.SOLUTION: An information recording medium is provided with a plurality of information recording layers having three layers or more. Each of the plurality of information recording layers is provided with a test record area used for adjusting recording conditions. One information recording layer out of the plurality of information recording layers is provided with a reproduction-exclusive management data area in which management data for managing the information recording medium is recorded beforehand. Each of other two or more information recording layers out of the plurality of information recording layers has the test record area where a part of the management data area and a radial position overlap with each other.
Abstract:
PROBLEM TO BE SOLVED: To determine recording power of a light beam when data are recorded in an information recording medium. SOLUTION: A recording power determination method includes steps of: recording test data at a plurality of test recording powers, measuring a modulation factor of the signal corresponding to each test recording power, calculating a product of an n'th power (exponent n is 2) of each test recording power and the corresponding modulation factor, calculating a first recording power based on correlation of the test recording power and the product and calculating recording powers based on the first recording power. A value of ρ and a value of κ are recorded in the information recording medium and are read out, an approximation linear line showing correlation of the plurality of test recording powers and the plurality of products is formed, the first recording power wherein the product is made 0 in the approximation linear line is calculated and the first recording power, and the product of (-1/(the value of κ)+2) and (the value of ρ) are calculated. COPYRIGHT: (C)2011,JPO&INPIT
Abstract:
PROBLEM TO BE SOLVED: To provide an information recording medium which has three or more recording layers and can record information on conditions suitable in each recording layer and to provide an information recording device. SOLUTION: In the information recording medium having n recording layers (n≥3) mutually layered and each having a test recording zone for determining the recording power, when the n layers are counted from the one that is located most distant from the surface of the medium in which a laser beam is made incident, there is a bigger radial location difference between the outer peripheral end of the inner one of the test recording zones of ith and (i+1)th recording layers (where i is an integer that satisfies 2≤i≤n-1) and the inner peripheral end of the other outer test recording zone than between the outer peripheral end of the inner one of the test recording zones of jth and (j+1)th recording layers (where j is an integer that satisfies 1≤j≤i-1) and the inner peripheral end of the other outer test recording zone. 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 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 decide recording power of an optical beam when data is recorded in an information recording medium. SOLUTION: The recording power decision method includes: a step of recording test data with a plurality of test recording powers, a step of measuring modulation degree corresponding to respective test recording powers, a step of calculating a product of n-th power (n is 2) of each test recording power and corresponding modulation degree, a step of calculating first recording power based on correlation between the test recording power and the products, and a step of calculating recording power based on the first recording power. A value of ρ and a value of κ are recorded in the information recording medium, a value of ρ and a value of κ are read out, an approximation line indicating correlation between a plurality of test recording powers and a plurality of products is created, the first recording power in which the product becomes 0 in the approximation line is calculated, then product of the first recording power and (-1/(value of κ)+2) and (value of ρ) is calculated. 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