A scanning device producing a first and a second scanning spot w

Details A scanning device producing a first and a second scanning spot w A scanning device producing a first and a second scanning spot w

1994-05-25

1997-05-27

Epps, Georgia Y.

Dynamic information storage or retrieval

Specific detail of information handling portion of system

Radiation beam modification of or by storage medium

369 4437, 369 97, 369119, 369 4418, 250236, H01J 314, G11B 720

Patent

active

056338511

ABSTRACT:
A scanning device for repeatedly scanning a scanning surface of a record carrier (e.g., a tape) by means of a first and a second scanning spot produced by respective scanning beams. The scanning spots perform synchronous movements along a first and a second scanning path, respectively, having different given scanning directions, as a result of which, the distance, viewed in a direction transverse to the scanning paths, between the first and the second scanning spot changes during scanning. The scanning device can be used in a recording and/or read apparatus which further includes a detection system for converting radiation emanating from the second scanning spot into a corresponding detection signal, and a measurement circuit which derives a position measurement signal indicative of deviation of track pitch based on a deviation in a relationship between the detection signal and a reference signal indicative of the position of the first scanning spot on the first scanning path. Other circuits can also be employed to derive a speed measurement signal indicative of the speed of the first scanning spot in a direction transverse to the track direction and a quality measurement signal indicative of the quality of an information pattern at the location of tracks traversed by the second scanning spot. If during reading a third scanning spot is used such that the second and the third scanning spot are always disposed symmetrically relative to the first scanning spot, corresponding detection signals can be obtained which can be used for deriving an inclination measurement signal indicative of the angle between the track direction and the first scanning path.

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patent: 5369631 (1994-11-01), Hwang
patent: 5548114 (1996-08-01), Van Rosmalen et al.

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