Process and optical device for generating signals...

Details Process and optical device for generating signals... Process and optical device for generating signals...

G - Physics

11

B

352/32.2

G11B 7/095 (2006.01) G11B 7/007 (2006.01) G11B 7/09 (2006.01) G11B 27/19 (2006.01) G11B 27/30 (2006.01)

Patent

CA 1202415

ABSTRACT OF THE DISCLOSURE The process makes it possible to generate on the basis of discrete preetching elements or flags, the radial tracking error and/or focusing error signals. The flags comprise portions displaced with respect to the mean axis of the tracks to be followed. According to a first variant, each track comprises portions displaced on either side of the axis, According to a second variant the flags comprise portions alternately displaced to one and then the other side thereof. In response to the passages of these portions, windows are generated and the pulses supplied by the photodetectors of the interaction of these portions on the focused scan beam are compared between successive windows.

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