Compact wide angle zoom lens

Details Compact wide angle zoom lens Compact wide angle zoom lens

1979-02-14

1980-12-30

Sacher, Paul A.

G01B 1516

Patent

active

042419816

ABSTRACT:
A compact wide angle zoom lens in order from the object side, of a divergent front lens group and a convergent rear lens group, the overall focal length being variable by mechanical movement of the front and rear lens groups. The divergent front lens group is composed, in order from the object side, of a first lens being a negative meniscus lens convex toward the object side, a second lens being a double convex positive lens or a positive cemented lens having positive and negative lenses, a third lens being a negative meniscus lens convex toward the object side, a fourth lens being a negative lens and a fifth lens being a positive lens. The convergent rear lens group is composed of a sixth lens being a positive lens, a seventh lens being a positive meniscus lens convex toward the object, an eighth lens being a double convex positive lens, a ninth lens being a double concave negative lens, the eighth and ninth lenses being cemented to each other, and the tenth lens being a positive lens. The overall lens system is composed of ten or eleven lens elements grouped into nine lens components.

REFERENCES:
patent: 4153339 (1979-05-01), Tajima et al.
patent: 4169660 (1979-10-01), Nakamura

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