Small-sized wide-angle lens

Details Small-sized wide-angle lens Small-sized wide-angle lens

1985-06-05

1987-04-28

Corbin, John K.

350459, 350460, G02B 1304

Patent

active

046609407

ABSTRACT:
A retro-focus type wide-angle lens which has a large angular field of 76.degree. to 90.degree. and secures a sufficient amount of corner illumination comprises only five sets of lens elements including eight or nine lens elements. The first set of convergent lens located on the object side is a positive lens. The first set of divergent lenses comprises two or three separate negative lenses. The second set of convergent lenses comprises two separate positive lenses. The third set of convergent lens comprises a positive lens. These sets of lenses are designed so as to satisfy various numerical conditions as defined in the specification.

REFERENCES:
patent: 3870400 (1975-03-01), Yamashita et al.
patent: 4025170 (1977-05-01), Kawamura
patent: 4311367 (1982-01-01), Mori

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