Scanning objective
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United States of America Patent
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Feb 24, 1987
Grant Date -
N/A
app pub date -
May 31, 1983
filing date -
May 29, 1982
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A scanning objective with two optical elements, which includes at least one aspherical surface; the aspherical surface is so constructed that in comparison with a spherical surface with the same vertex radius of curvature, the thickness of the lens increases toward the outside. By this construction of the aspherical surface in accordance with the present invention, for example, a scanning objective with two lenses and an aspherical surface can be obtained which is limited in diffraction for small image scales.
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