Semi-wide angle objective lens

Details Semi-wide angle objective lens Semi-wide angle objective lens

1978-06-06

1980-07-29

Sacher, Paul A.

350216, G02B 960, G02B 962

Patent

active

042148154

ABSTRACT:
A semi-wide angle objective lens in accordance with the present invention comprises five groups of six lens elements including a front group and a rear group in which the front group has a first group which includes a single positive meniscus lens L.sub.1 with its convex surface directed toward the object side, a second group which includes a single negative meniscus lens L.sub.2 with its convex surface directed toward the object side, and a third group which includes a single positive meniscus lens L.sub.3 with its convex surface directed toward the object side; and in which the rear group has a fourth group which includes both a negative lens L.sub.4 with its front concave surface having a large curvature directed toward the object side and a positive lens L.sub.5 with its rear convex surface having a large curvature directed toward an image side with the fourth group lenses cemented together or arranged with an extremely small air space therebetween, and a fifth group which includes a positive lens L.sub.6 characterized in that each of the following conditions is fulfilled:

REFERENCES:
patent: 2622478 (1952-12-01), Kleinberry et al.
patent: 3926503 (1975-12-01), Takahashi et al.
patent: 3938882 (1976-02-01), Oishi

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