Optical disc having servo-track portions and sector...

Details Optical disc having servo-track portions and sector... Optical disc having servo-track portions and sector...

G - Physics

11

B

352/32.2

G11B 7/013 (2006.01) G11B 7/007 (2006.01) G11B 7/08 (2006.01) G11B 7/09 (2006.01) G11B 7/095 (2006.01) G11B 7/12 (2006.01) G11B 7/24 (2006.01) G11B 7/26 (2006.01) G11B 23/00 (2006.01)

Patent

CA 1249659

22 ABSTRACT: Record-carrier body provided with a relief structure of optically detectable servo-track portions and sector addresess and apparatus for forming said structure. A record carrier body is describe provided with sector addresses (12) and servo-track portions (13). As the maximum width of the servo-track portions is at least 60% of the track period (Pr), in a direction transverse to the track direction, and is at least of the order of twice the maximum width of the sector-address areas (15), it is possible to obtain an improved tracking signal in addition to a satisfactory address signal. An improved information signal can be obtained by recording the information (22) in the lands between the servo tracks. Fig. 7.

499736

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