Scanning light beam of changing size

Details Scanning light beam of changing size Scanning light beam of changing size

G - Physics

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G11B 7/00 (2006.01) G11B 7/005 (2006.01) G11B 7/12 (2006.01) G11B 7/125 (2006.01) G11B 7/135 (2006.01) G11B 19/24 (2006.01)

Patent

CA 1100233

SO975 ROTATABLE RECORD CARRIER AND METHOD AND APPARATUS FOR OPTICALLY REPRODUCING INFORMATION FROM 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. The pits may represent frequency-modulated information signals, and the lengths of the pits are independent of the fre- quency of the information signals. A method and apparatus for reproducing information from this record carrier is disclosed, wherein a light beam is used to scan the tracks of the record medium, and the size of the scanning light beam is changed as a function of the radius of the track which then is being scanned so as to increase the size of the beam when a track of larger radius is scanned. This control over the size of the scanning beam establishes a constant relationship between the size of the beam and the length of the pits despite changes in the pit length due to the different radii of the tracks. -i-

291841

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