Reading lens system

Details Reading lens system Reading lens system

1993-01-21

1994-03-08

Arnold, Bruce Y.

Optical: systems and elements

Lens

Multiple component lenses

359756, G02B 962

Patent

active

052932702

ABSTRACT:
An improved Gauss-type reading lens system having high lens performance in which there is only a small difference in performance in the meridional and sagittal directions and which can efficiently correct aberrations at various operating wavelengths to produce only limited chromatic aberrations. The system includes, 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 biconvex sixth lens element. The second and third lens elements are cemented and the fourth and fifth lens elements are cemented. The reading lens system satisfies certain conditions.

REFERENCES:
patent: 3815974 (1974-06-01), Momiyama
patent: 4812027 (1989-03-01), Yanagisawa
patent: 5159496 (1992-10-01), Kataoka

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