Lens used for picture image reading and picture image reader tha

Details Lens used for picture image reading and picture image reader tha Lens used for picture image reading and picture image reader tha

1999-02-12

2000-08-08

Epps, Georgia

Optical: systems and elements

Lens

Multiple component lenses

359759, G02B 962

Patent

active

061010499

ABSTRACT:
A lens used for picture image reading that consists of six lens elements arranged as a deformed Gauss type lens, and an improved image reader which uses the lens. By establishing the lens elements to be of prescribed shapes and so that certain specified conditions are satisfied, a lens having high resolution, with the various aberrations being favorably corrected over a wide range of wavelengths, is provided. Further, the manufacturing costs of the lens are lowered. The lens includes, in order from the object side: a first lens element L.sub.1 of a positive meniscus shape, a second lens element L.sub.2 of a positive meniscus shape, a third lens element L.sub.3 of a negative meniscus shape with its concave surface on image side, a fourth lens element L.sub.4 of a negative meniscus shape with its concave surface on the object side, a positive fifth lens element L.sub.5, and a positive sixth lens element L.sub.6 with its convex surface on the image side.

REFERENCES:
patent: 5388003 (1995-02-01), Naganuma et al.
patent: 5920434 (1999-07-01), Mori

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