Optical holographic scanner
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United States of America Patent
Stats
-
May 31, 1988
Grant Date -
N/A
app pub date -
Mar 20, 1987
filing date -
Mar 20, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A holographic disc for use in a spot scanning system is formed with diffractive gratings having optical power incorporated therein, thereby eliminating the need for an f-theta lens between the disc and the scanning plane. The disc is formed by rotating it at high speeds to achieve gyroscopic stability and then exposing a recording medium to short pulse superimposed wavefronts, one of which imparts optical power to the grating being formed. The gyroscopic stabilization insures that each grating is located exactly the same radial distance from the disc axis.
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