Optical scanning apparatus
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
May 2, 1989
Grant Date -
N/A
app pub date -
Mar 28, 1988
filing date -
Jan 11, 1988
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An apparatus is described for optically scanning an information surface by moving said surface relative to a beam, which apparatus comprises a radiation source for supplying a beam, a collimator lens and an objective for focusing the beam to a spot in the information plane. The height of the apparatus can be reduced and/or a beam having an asymmetrical cross-section can be converted into a beam having a symmetrical cross-section by arranging a reflective diffraction grating with a suitable grating period between the collimator lens and the objective, while the angle of incidence between the normal on the grating and the chief ray of the scanning beam deviates considerably from 45.degree..
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