1982-04-13
1985-02-05
Corbin, John K.
G02B 964, G02B 1518
Patent
active
044975473
ABSTRACT:
A zoom lens comprises, in succession from the object side, a convergent first lens unit stationary during zooming and moved on the optical axis during focusing, a divergent second lens unit which is a variator moved on the optical axis during zooming, a divergent third lens unit which is a compensator moved on the optical axis during zooming, and a convergent fourth lens unit as a master lens system stationary during zooming. The fourth lens unit comprises, in succession from the object side, a convergent first master lens unit, a convergent second master lens unit and a divergent third master lens unit. The first master lens unit has, in succession from the object side, a positive lens, a positive and a negative lens cemented to each other in a cemented surface concave toward the object side, a positive lens having its surface of greater curvature facing the object side, and a negative lens having its surface of greater curvature facing the image side. The second master lens unit has a biconvex single lens, and the third master lens unit has at least one negative lens and a positive lens.
REFERENCES:
patent: 4303312 (1981-05-01), Basista
Corbin John K.
Gass Rebecca D.
Nippon Kogaku K.K.
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