Reading lens system

Details Reading lens system Reading lens system

1997-01-24

1999-06-29

Epps, Georgia

Optical: systems and elements

Lens

Including a nonspherical surface

359739, 359794, 235454, G02B 302, G02B 906, G06K 710

Patent

active

059176610

ABSTRACT:
A reading lens system composed, in order from the object side, of a first positive biconvex lens component, a second positive meniscus lens component convex toward the image side and an aperture stop disposed on the image side of the second lens component. By setting a distance as measured from a first surface to an aperture stop of the reading lens system adequately, it is configured so as to have a short total length and allow little variation of a size of an image even when the image is defocused due to a variation of an object location.

REFERENCES:
patent: 5666234 (1997-09-01), Ohno

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