Reading lens system

Details Reading lens system Reading lens system

1989-10-10

1990-07-24

Sugarman, Scott J.

G02B 936

Patent

active

049431463

ABSTRACT:
A reading lens system comprises, in order from the object side, a positive meniscus first lens element having a convex surface directed toward the object, a positive meniscus second lens element having a convex surface directed toward the object, a negative meniscus third lens element having a convex surface directed toward the object, a negative meniscus fourth lens element having a concave surface directed toward the object, a positive meniscus fifth lens element having a concave surface directed toward the object, and a positive sixth lens element. The second and third lens elements are cemented and the fourth and fifth lens elements are also cemented to provide an overall system of four-unit-six-element composition, with the lens system satisfying a number of conditions to obtain a lens having an F number of about 1:4.0 and a half viewing angle of not greater than 20.degree. and which is capable of efficient compensation for aberrations, in particular astigmatism and chromatic aberrations.

REFERENCES:
patent: 2983193 (1961-05-01), Schade
patent: 3136840 (1964-06-01), Buzawa
patent: 4057329 (1977-11-01), Fleischman
patent: 4377326 (1983-03-01), Kobayashi
patent: 4784480 (1988-11-01), Yokota et al.
patent: 4863251 (1989-09-01), Herloski et al.

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