Reading optical system
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United States of America Patent
Stats
-
May 23, 1995
Grant Date -
N/A
app pub date -
Feb 16, 1994
filing date -
Feb 18, 1993
priority date (Note) -
In Force
status (Latency Note)
Importance
Abstract
A reading optical system is provided which includes a diaphragm and a positive meniscus lens having a concave surface, wherein the concave surface is located on the side of the lens nearest to the diaphragm, and wherein the following relationship exists; 0.15<(d1+d2)/f<0.41 0.35<(d1+d2)/.vertline.r1.vertline.<0.85 wherein '(d1+d2)' designates the sum of the distance between the diaphragm and the lens and the thickness of the lens, 'f' the focal length the meniscus lens, and 'r1' the radius of curvature of a surface located on an objective side of the meniscus lens.
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Family
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Cited Art Landscape
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