Compact photographic lens

Details Compact photographic lens Compact photographic lens

1984-12-05

1987-09-22

Corbin, John K.

350449, 350469, G02B 1318, G02B 934

Patent

active

046951342

ABSTRACT:
The disclosed compact photographic lens includes, from front to rear, a positive meniscus-shaped first lens unit convex toward the front, a negative aspheric second lens unit concave toward the front, a bi-concave third lens unit, and a negative fourth lens unit with its front surface concave toward the front. The lens satisfies the following conditions:

REFERENCES:
patent: 1077420 (1913-11-01), Minor
patent: 4124276 (1978-11-01), Okano et al.
patent: 4368956 (1983-01-01), Yamada et al.
patent: 4477155 (1984-10-01), Sato et al.
patent: 4521084 (1985-06-01), Kurihara
patent: 4596447 (1986-06-01), Yamada et al.

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