Large aperture wide angle type photographic lens system

Details Large aperture wide angle type photographic lens system Large aperture wide angle type photographic lens system

1994-04-05

1996-03-12

Nelms, David C.

Optical: systems and elements

Lens

Multiple component lenses

359715, 359740, G02B 934, G02B 1318

Patent

active

054991420

ABSTRACT:
A large aperture wide angle type photographic lens system comprises a positive meniscus lens having a convex surface directed toward an object, a bi-concave lens provided at the image side with respect to the positive meniscus lens, a bi-convex lens provided at the image side with respect to the bi-concave lens and a negative meniscus lens having a convex surface directed toward an image and provided at the image side with respect to the bi-convex lens. The characteristics of the lenses have predetermined relationship.

REFERENCES:
patent: 4303313 (1981-12-01), Imai et al.
patent: 4359271 (1982-11-01), Mihara
patent: 4413888 (1983-11-01), Sato
patent: 4606607 (1986-08-01), Kurihara
patent: 4653870 (1987-03-01), Imaizumi
patent: 4787721 (1988-11-01), Fukushima et al.
patent: 4792216 (1988-12-01), Kudo

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