Ultra-wide angle F-.theta. lens system
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United States of America Patent
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Nov 29, 1988
Grant Date -
N/A
app pub date -
Oct 15, 1986
filing date -
Oct 15, 1985
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An ultra-wide angle f-.theta. lens system comprising, in the order from the light beam deflector side, a first lens component having positive power, a second lens component having negative power, and a third lens component having positive power, the ultra-wide angle f-.theta. lens system being arranged to have an ultra-wide scanning angle widened to .+-.45.degree. and exhibiting an imaging performance of laser beam waist close to the diffraction limit in spite of the fact that the f-.theta. lens system comprises a small number of lenses.
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