Reading lens system for use in scanner

Details Reading lens system for use in scanner Reading lens system for use in scanner

1990-07-31

1991-08-20

Sugarman, Scott J.

Optical: systems and elements

Lens

Multiple component lenses

359470, G02B 938, G02B 952, G02B 954

Patent

active

050408844

ABSTRACT:
A reading lens system for a scanner is used at a reduced magnification so as to read an original image at a high speed, and comprises, successively in order from an object toward an image, a first lens unit to a fifth lens unit and an aperture disposed between the second lens unit and the third lens unit. The first lens unit comprises a positive lens serving as a first lens and a negative lens serving as a second lens and being cemented on an image side of the first lens. The second lens unit comprises a meniscus lens serving as a third lens, of which convex surface faces the object. The third lens unit comprises a meniscus lens serving as a fourth lens, of which convex surface faces an image. The fourth lens unit comprises a biconcave lens serving as a fifth lens and a biconvex lens serving as sixth lens and being cemented on the image side of the fifth lens. The fifth lens unit comprises a plane-parallel glass plate serving as a seventh lens. The lens system has the ratio f/f.sub.12 within the predetermined range where f is the focal length of the entire lens system, and f.sub.12 is the focal length of the first lens unit.

REFERENCES:
patent: 2559875 (1951-07-01), Herzberger
patent: 2779239 (1957-01-01), Ito
patent: 2792749 (1957-05-01), Koch
patent: 3817599 (1974-06-01), McCrobie
patent: 4671627 (1987-06-01), Shinohara

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