Tracking servo circuit for an optical pick-up

Details Tracking servo circuit for an optical pick-up Tracking servo circuit for an optical pick-up

G - Physics

11

B

352/32.2

G11B 7/09 (2006.01)

Patent

CA 1230420

ABSTRACT OF THE DISCLOSURE A tracking servo signal is generated for use in an optical disc pick-up system, being particularly advantageous for use when the depth of the pits is greater or less than one-fourth the wavelength of the light beam used to read the disc, in which case diffraction patterns formed by reflected light beams are not symmetric on a photo-detector and typically result in DC-shifted tracking error signals. A first tracking error signal is generated from selected output signals of a number of light-receiving areas of the photo-detector and a second tracking error signal is generated by combining output signals from these light-receiving areas in a pattern different than that used in generating the first tracking error signal. These two tracking error signals are combined so that the resultant signal forms a tracking servo signal that has substantially no DC component.

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