Front-diaphragm wide angle lens

Details Front-diaphragm wide angle lens Front-diaphragm wide angle lens

1985-09-26

1986-11-04

Corbin, John K.

350475, G02B 916

Patent

active

046207759

ABSTRACT:
In a triplet photographic lens wherein a diaphragm is arranged forwardly of a lens, an asymmetry of arrangement with respect to the diaphragm has been remarkable to make it difficult to provide a wide angle.
According to the present invention, principally a second lens L.sub.2 and a third lens L.sub.3 are bended so as to come closer to a centripetal shape about the diaphragm to make small the full length and a spacing between lenses thereby providing compensation of aberrations and increasing relative illumination, thus providing a wide angle lens having an angle of view of 70.degree..

REFERENCES:
patent: 3649103 (1972-03-01), Kamimura
patent: 3895857 (1975-07-01), Imai
patent: 3910685 (1975-10-01), DeJager
patent: 3912379 (1975-10-01), DeJager
patent: 3967884 (1976-07-01), DeJager
patent: 4522471 (1985-06-01), Nishioka
patent: 4542961 (1985-09-01), Sato

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