Rotatable record carrier and method and apparatus for...

Details Rotatable record carrier and method and apparatus for... Rotatable record carrier and method and apparatus for...

G - Physics

11

B

352/32.2

G11B 7/00 (2006.01) G11B 7/0045 (2006.01) G11B 23/00 (2006.01)

Patent

CA 1104251

SO974 ROTATABLE RECORD CARRIER AND METHOD AND APPARATUS FOR PRODUCING SAME ABSTRACT OF THE DISCLOSURE A rotatable record carrier upon which reproducible information is recorded in the form of spaced apart pits in substantially concentric circular tracks on a surface of the carrier. A method of producing this record carrier is disclosed wherein, although the linear velocity of each track is dependent upon the radius of the track, the length of the pits in the respective tracks does not vary as a function of the change in the radius from one track to the next. A light beam is modulated with a rectangular pulse information signal, the duration of each pulse being controlled as a function of the radius of the track which is being scanned by the modulated light beam. For tracks having a smaller radius, the pulse duration is made larger than for tracks having a larger radius. When the record carrier of this invention is used for optically reproducing the recorded information signals, a proper relationship between the size of the scanning beam spot and the length of the recorded pits can be maintained merely by retaining a substantially constant beam spot. -i-

290834

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