Skew detection system for optically read data

Details Skew detection system for optically read data Skew detection system for optically read data

1984-06-06

1986-05-13

Pitts, Harold I.

Registers

Records

235491, 235493, 235494, G06K 1900

Patent

active

045888825

ABSTRACT:
A skew correction system for data media, especially optical data storage media wherein a pair of identical geometric marks are spaced apart in a band or track parallel to a data track, the data tracks being transverse to the directions of relative motion of the data storage medium with respect to a detector. As the medium moves relative to the detector, a linearly scanning detector, portions of each geometric mark are observed by the detector. A ratio of picture elements is determined using the two sets of observed picture elements. If the ratio is other than 1, skew exists. A closed-loop servo system is used to restore the ratio to 1, thereby eliminating skew. The geometric marks may be disposed forward of the data tracks, astride the data tracks, behind the data tracks, interspersed with the data tracks, or if different colors of light are used, atop the data tracks.

REFERENCES:
patent: 3700862 (1972-10-01), Snook et al.
patent: 3739154 (1973-06-01), Corcoran
patent: 4201339 (1980-05-01), Gunn
patent: 4337394 (1982-06-01), Fukushima

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