Optical-disk driving apparatus

Details Optical-disk driving apparatus Optical-disk driving apparatus

G - Physics

11

B

352/32.2

G11B 21/12 (2006.01) G11B 7/085 (2006.01) G11B 7/09 (2006.01) G11B 21/02 (2006.01) G11B 21/08 (2006.01)

Patent

CA 1304500

ABSTRACT OF THE DISCLOSURE An optical-disk reading apparatus has a carriage on which a tracking actuator and a photosensor unit are mounted. They are driven by a head actuator to move a spot of a light beam to traverse tracks on an optical disk. The photosensor detects first position and second position signals indicative of the position of the spot on the tracks through addition and subtraction of electric signals corresponding to changes in the quantities of light reflected from the tracks upon the movement of the spot. A first waveshaping circuit causes the half wave of the first position signal that is greater than, and the half wave of the first position signal that is smaller than, the mean value of the first position signal to correspond respectively to a rectangular pulse and a zero amplitude signal for each cycle and for converting the pulse and zero amplitude signal into a first shaped position signal delayed for a predetermined time. A second waveshaping circuit acts in the same fashion on the second position signal. The shaped position signals ensure accurate placement of the light spot on a desired track of the disk even when the first and second position signals contain omissions.

555813

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