Thin type photographic lens system

Details Thin type photographic lens system Thin type photographic lens system

1983-05-09

1984-06-26

Corbin, John K.

350432, G02B 934, G02B 1514

Patent

active

044563450

ABSTRACT:
The disclosed wide angle objective has a smaller telephoto ratio than unity and includes, from front to rear, a positive meniscus lens of forward convexity, a bi-concave lens and a bi-convex lens followed, after a large space, by a negative meniscus lens of forward concavity with a diaphragm positioned between the bi-convex lens and the negative meniscus lens. During focusing, the positive meniscus lens, bi-concave lens and bi-convex lens are axially moved in unison. The bi-convex lens is formed by positive and negative lens elements cemented together, and the front surface of the negative meniscus lens is aspherical.

REFERENCES:
patent: 3951523 (1976-04-01), Nishimoto
patent: 4124276 (1978-11-01), Okano et al.
patent: 4204747 (1980-05-01), Imai

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