Zoom lens

Details Zoom lens Zoom lens

1981-07-02

1984-03-20

Corbin, John K.

G02B 1516

Patent

active

044377339

ABSTRACT:
A zoom lens comprises a magnification changing system and a relay lens system succeeding the magnification changing system. The magnification changing system comprises, in succession from the object side, a first group as a focusing portion having a positive refractive power, a second group as a variator portion having a negative refractive power and movable along the optical axis to thereby change chiefly the focal length, and a third group as a compensator portion having a negative refractive power and maintaining the image plane fluctuated by movement of the variator portion at a predetermined position. The relay lens system comprises a fourth group as a forward relay system group having a positive refractive power and a fifth group as a rearward relay system group having a positive refractive power. The fourth group has three positive lens components of which at least the middle lens component is a cemented lens component having a convex cemented surface in the direction of the image side. The fifth group has at least one positive lens component which is a cemented lens having a convex cemented surface on the object side.

REFERENCES:
patent: 4157211 (1979-06-01), Tanaka et al.
patent: 4318592 (1982-03-01), Tanaka

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