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专利名称：Astigmatizer for laser recording and
reproducing system
发明人：Charles A. Glorioso申请号：US05/530887申请日：19741209公开号：US03983317A公开日：19760928
摘要：In a laser recording system, a high energy intensity laser beam is focused toform a circular write-spot on a rotating thermoplastic disc. This spot creates tracks ofgrooves and flat areas or lands in accordance with input data. To read the data from thedisc a reduced energy beam is focused on the previously recorded track, and the patternof grooves and lands is determined from the reflected energy. The optics associated withthe reading process include an astigmatizer which elongates the read-spot in a directiontransverse to the track. This reduces mechanical tolerances required to insure that theread-spot will impinge upon the desired track. The astigmatizer may also serve to reducethe beam spot energy intensity so that the same laser, without the astigmatizer, can beused for the recording process.
In one embodiment, the astigmatizer is a movable plate having a single slit. Forreading, the astigmatizer is positioned in the beam path and the slit creates anorthogonal diffraction pattern which provides the elongated read-spot of reducedenergy intensity.
申请人：TELETYPE CORPORATION
代理人：D. L. Hurewitz,J. L. Landis
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