Stock material or miscellaneous articles – Circular sheet or circular blank – Recording medium or carrier
Patent
1989-04-18
1990-05-15
Ryan, Patrick
Stock material or miscellaneous articles
Circular sheet or circular blank
Recording medium or carrier
428 65, 428209, 428913, 369288, 346 76L, 3461351, 430945, B32B 302
Patent
active
049257170
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
This invention relates to a disk-shaped, recording medium in which recording tracks forming a large number of concentric turns are formed on an annular recording surface section for surrounding a central hole formed in said annular recording surface section, each of said turns of said recording tracks including a predetermined number of recording regions, corresponding ones of said recording regions among said turns of said recording tracks being arrayed in the radial direction of the recording surface section, each of said recording sections including a control recording region and an information writing region consecutive thereto, and a disk apparatus employing the disk shaped recording medium.
BACKGROUND OF ART
Recently, disk-shaped recording media, such as the optical disks or magneto-optical disks employing the optical or magneto-optical signal recording/reproducing method, have been evolved, and are being offered to the market. As these disk-shaped recording media, there are known the recording media of the read only memory (ROM) type, such as the so-called compact disk (CD), the recording media of the so-called write once type in which data writing is feasible only once by the user, and the recording media in which the data rewriting (so-called overwriting) is possible, such as the magneto-optical disk. As one of the techniques for realizing a unified recording format for these various recording media, there is proposed a so-called sampled servo technique in which, similarly to the so-called sector servo in a hard disk in the field of the magnetic disk, servo signals are recorded previously on the spiral or concentric tracks at predetermined intervals or angles (so-called preformating), these discrete signals being sampled and held at the time of the rotative driving of the disk to effect continuous servo control. As this kind of the disk-shaped recording medium, there is known to data an optical disk d shown for example in FIG. 9. Wherein clock information pits arranged on a track center line, a pair of tracking information pits spaced by a predetermined distance from said clock information pits and positioned on the inner and outer sides of said track center line and pairs of traverse information pits spaced by a distance allocated to each of said recording tracks and arranged on said track center line, are provided tracks tk, is mounted on a recording/reproducing device and rotated in the direction of an arrow mark r for information recording or reproduction employing the optical beam.
Each of the sectors SC.sub.1, SC.sub.2, . . . SC.sub.m in each circular track is provided at towards its incipient side with an address information section ad followed by a predetermined number n of blocks bl.sub.1, bl.sub.2, . . . , bl.sub.n, (where n=43, as an example). As far as the blocks bl.sub.1, bl.sub.2, . . . , bl.sub.n are concerned a plurality of registering blocks among the sectors, such as the block bl.sub.1 among the sectors SC.sub.1, SC.sub.2, . . . SC.sub.m, are aligned in the radial direction of this optical disk d. Each of the blocks bl.sub.1, bl.sub.2, . . . , bl.sub.n of each of the sectors SC.sub.1, SC.sub.2, . . . , SC.sub.m is provided towards its incipient end with a control recording area ar.sub.C, following by an information writing area ar.sub.D to constitute a unit information division. In the control recording area ar.sub.C of each of the blocks bl.sub.1, bl.sub.2, . . . , bl.sub.n, tracking information pits q.sub.a and q.sub.b, positioned on the outer and inner sides of a track center line k.sub.c, and a clock information pit q.sub.c, positioned on the track center line k.sub.c, are formed in advance along the center line k.sub.c with a predetermined distance from one another. Referring to the array on the disk of the information pits q.sub.a, q.sub.b and the clock information pits q.sub.c in a direction orthogonal to the track centerline k.sub.c, that is, the radial direction of the optical disk d, the track information pits q.sub.b and the clock information pits q
REFERENCES:
patent: 4223347 (1980-09-01), Bouwhuis et al.
Kobayashi Seiji
Ogawa Masataka
Tsukamura Yoshihiro
Ryan Patrick
Shaw, Jr. Philip M.
Sony Corporation
LandOfFree
Disk-shaped recording medium and disk apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Disk-shaped recording medium and disk apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Disk-shaped recording medium and disk apparatus will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-620873