Rear conversion lens system

Details Rear conversion lens system Rear conversion lens system

1988-03-23

1989-05-16

Corbin, John K.

350475, 350477, G02B 1502, G02B 912, G02B 914

Patent

active

048304735

ABSTRACT:
Disclosed is a compound lens system consisting of a main lens system and a rear conversion lens system located at the image side of the main lens system, wherein the rear conversion lens system comprises, from the object side to the image side, a first positive single lens component made of a synthetic resin material and having an aspheric surface and a second negative compound lens component consisting of a positive lens element and a negative lens element. The first positive single lens component has a refractive index of a determined value between 1.4 and 1.6. The difference value between a refractive index of the negative lens element and a refractive index of the positive lens element of the second negative compound lens component is selected to be between 0.01 and 0.4. The aspheric surface of the first positive single lens component is formed in such a manner as to compensate for a coma aberration, excessive compensation of a spherical aberration and excessive compensation of field curvature aberration.

REFERENCES:
patent: 4394071 (1983-07-01), Yamada
patent: 4422734 (1983-12-01), Tanaka et al.
patent: 4749263 (1988-06-01), Taniguchi et al.

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