Imagery lens system

Optical: systems and elements – Lens – Multiple component lenses

Patent

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Details

359778, G02B 936

Patent

active

054934494

ABSTRACT:
An imagery lens system for image reading consists of first to fourth lens elements which are arranged in this order from the object side. The first and fourth lens elements respectively are double-convex lenses, and the second and third lens elements respectively are double-concave lenses. The following formulae are satisfied.

REFERENCES:
patent: 2407347 (1946-09-01), Sachtleben
patent: 3619036 (1971-11-01), Baken
patent: 4264139 (1981-03-01), Maeda
patent: 4285579 (1981-08-01), Yamada
patent: 4415241 (1983-01-01), Shinohara
patent: 4781449 (1988-04-01), Hirakawa et al.
patent: 5139342 (1992-08-01), Matsuzaki

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