Optical image pick-up lens
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United States of America Patent
Stats
-
Nov 2, 2004
Grant Date -
Sep 23, 2004
app pub date -
Mar 19, 2003
filing date -
Mar 19, 2003
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
An optical image pick-up lens is formed from crescent-shaped first and second lenses that may be aspherical molded glass lenses or aspherical plastic lenses. A convex surface at a first side of the first lens faces toward an object, and a convex surface at a second side of the second lens faces toward a formed image. The lens enables reduced lens length and high resolution by satisfying the following relational expressions: 0.4f.ltoreq.d<0.9f; 0.5f.ltoreq..vertline.R3.vertline..ltoreq.100f; and 0.01<.vertline.f2.vertline./.vertline.f1.vertline.<0.9; where, f is an overall focal length of the lens; d is a distance from the first side of the first lens to the second side of the second lens; R3 is a radius of curvature of an object side of the second lens; f1 is a focal length of the first lens; and f2 is a focal length of the second lens.
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