Apparatus for improving focus during playback of an optical...

Details Apparatus for improving focus during playback of an optical... Apparatus for improving focus during playback of an optical...

G - Physics

11

B

352/32.21, 88/94

G11B 7/09 (2006.01) G11B 7/12 (2006.01)

Patent

CA 1215467

ABSTRACT An apparatus for improving the focus of a digital optical record and playback system is described which provides plural simultaneous focal paths of differ- ent lengths for playing back or recording a digital optical data record. These focal paths may interact a common bit portion on a data record, successive bit positions in the same row of data on the record, or bit portions on adjacent tracks of data on the record. In certain embodiments, a selection circuit is utilized for evaluating the focal paths and selecting one which results in an improved focus. Data records having re- corded bits of data of extended depth are also described to facilitate focusing during playback of the data record.

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