Dynamic information storage or retrieval – Condition indicating – monitoring – or testing – Of record carrier
Reexamination Certificate
1998-05-21
2001-08-28
Tran, Thang V. (Department: 2651)
Dynamic information storage or retrieval
Condition indicating, monitoring, or testing
Of record carrier
30, 30
Reexamination Certificate
active
06282162
ABSTRACT:
TECHNICAL FIELD
This invention relates to an optical disc of the sample servo system and a driving device therefor.
BACKGROUND ART
There has hitherto been known an optical disc system for recording/reproducing various data by scanning a concentrically or spirally extending track on the disc by a laser beam, in which the optical disc is driven at a constant linear velocity (CLV) or at a constant angular velocity (CAV) for recording/reproducing the data. There has also been known an optical disc system of a continuous servo system in which tracking control is performed using a continuous pre-groove formed along the track, or of a sample servo system in which tracking control is performed using discrete servo areas formed on the track.
Among known types of the optical discs, there are a recordable RAM disc, such as a replay-only ROM disc, a write-once disc or a magneto-optical disc (MO disc) and a so-called partial ROM disc having both ROM and RAM areas.
An optical disc system, handling such optical disc, is configured for reading the parameter information for the medium recorded on a phase encoded part (PEP) provided on an inner rim of the optical disc as prescribed in ISO MO 5.25 inch standards and for reading the control information from the control track based upon the control information for carrying out the control operation responsive to the control information.
With the continuous composite servo system (CCS system) standardized in ISO, servo data is affected by data per se. That is, if data recording density is increased, system clocks can be reproduced with increasing difficulties, such that it becomes difficult to achieve high recording density. Besides, since the groove and pits must be cut simultaneously, it is difficult to produce a ROM disc or a partial ROM disc.
In addition, with the conventional optical disc, a dedicated decoding circuit has been required for reading out the parameter information recorded on the PEP. Since the PEP lacks in the address information, the pickup position cannot be identified. Since the PEP and the recording area for data per se are different in formats, the two areas need to be demarcated from each other via a gap.
It is therefore an object of the present invention to provide an optical disc of a sample servo system of high capacity and high performance, and a driving system therefor.
It is another object of the present invention to provide an optical disc in which the parameter information can be read without requiring a dedicated decoding circuit and in which the pickup position can be identified.
DISCLOSURE OF THE INVENTION
The present invention provides an optical disc having a plurality of substantially concentrically extending tracks, each track including a plurality of segments having a servo area having servo pits giving the servo information to a disc drive and a data area. There is provided a discrimination mark giving the information for identifying a segment by the recording position in the servo area.
With the optical disc of the present invention, the segments include a data segment for recording user data and an address segment for specifying an address of the data segment. The discrimination mark discriminates the data segment from the address segment.
With the optical disc of the present invention, a sector is formed by a plurality of segments and a segment at a leading end of the sector is identified by the discrimination mark.
With the optical disc of the present invention, a sector is formed by a plurality of segments and a segment at a leading end of the sector and a directly previous segment are identified by the discrimination mark.
With the optical disc of the present invention, the segments include a data segment for recording user data and an address segment specifying an address of the data segment, and a plurality of said segments make up a sector. The data segment and the address segment may be discriminated from each other by the discrimination mark and the segment constituting the leading end of the sector and the directly previous segment may be discriminated from each other by the discrimination mark.
With the optical disc of the present invention, a segment directly previous to the segment at the leading end of the sector is identified by said discrimination mark.
The present invention also provides an optical disc having a plurality of substantially concentrically extending tracks, each track including a plurality of segments having a servo area having servo pits giving the servo information to a disc drive area, and a data area, in which the segments are made up of address segments arranged at the same positions in the radial direction of the tracks and having the address information recorded in said data area, and a data segment for recording user data, and in which the address information is recorded in the address segment in the gray code representation using a region of five clocks for the 2-bit information. The clocks are generated by a disc drive based upon the servo pits.
The present invention also provides an optical disc having a plurality of substantially concentrically extending tracks, each track including a plurality of segments having a servo area having servo pits giving the servo information to a disc drive, and a data area, in which plural segments are made up of address segments formed at the same position in the radial direction of each track and having the address information recorded in each data area and a data segment for recording user data. The address information is recorded as bits in 4-bit gray code representation in a 11-clock area of the clock signals in said address segment, upper two bits in the four bits corresponding to 5 clocks by the gray code representation and the lower two bits corresponding to 5 clocks in the gray code representation, and one clock therebetween. The 1-clock area has a pit formed therein when the pit representing the upper two bits in the gray code representation and the pit representing the lower two pits in the gray code representation are at the shortest distance from the one-clock area and when one of the pits is at the shortest distance and the outer is at the longest distance from the one-clock area.
With the optical disc of the present invention, plural servo pits are recorded in the servo area so as to have an area of two clock signals and a distance of not less than 5 pits.
With the optical disc of the present invention, scrambled and NRZI converted data is recorded in said data segment.
With the optical disc of the present invention, a pre-write area having data of a pre-set polarity recorded therein is provided at a leading end of a data area of the data segment.
With the optical disc of the present invention, a post-write area having data of a pre-set polarity recorded therein is provided at a trailing end of a data area of the data segment.
The present invention also provides an optical disc having a plurality of substantially concentrically extending tracks, each track including a plurality of segments arranged in the same radial direction relative to the track and having a servo area having servo pits giving the servo information to a disc drive, and a data area, in which the optical disc is divided into plural zones each having a uniform number of sectors by setting the relation of the number of servo clocks SCKseg per segment and the number of data clocks DCKseg per segment, wherein M and N are integers.
With the optical disc of the present invention, the number of servo clocks SCKseg per segment is set to SCKseg=9N.
With the optical disc of the present invention, the next zone is started from the next segment even if there is a redundant area in the last segment of a zone and the start segments of the respective zones are arrayed at the same radial positions.
The present invention also provides an optical disc having a plurality of substantially concentrically extending tracks, each track including a plurality of segments having a servo area having servo pits giving the servo information to a disc drive, and a data ar
Fujita Goro
Otsuka Satoshi
Tobita Minoru
Yamagami Tamotsu
Oblon & Spivak, McClelland, Maier & Neustadt P.C.
Sony Corporation
Tran Thang V.
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