1981-05-11
1983-02-08
Corbin, John K.
G02B 1516
Patent
active
043726542
ABSTRACT:
A telephoto zoom lens comprises a first, a second, a third and a fourth group which are sequentially disposed beginning from an object side. The first group is a focusing lens group and remains stationary during a zooming operation, but is movable during a focusing operation and as a whole has a positive refractive power. The second group is a variator lens group and generally has a negative refractive power. The second group moves along the optical axis during a zooming operation, and is principally used for converting the focal length. The third group is a compensator lens group which generally has a positive refractive power and which moves along the optical axis during a zooming operation to maintain an image plane at a given location as it varies with a movement of the second group. The fourth group is a relay lens system which remains stationary during a focusing or a zooming operation.
REFERENCES:
patent: 4094586 (1978-06-01), Sato et al.
patent: 4105291 (1978-08-01), Tsuji
Fujioka Yoshisato
Kawamura Atsushi
Corbin John K.
Gerber Eliot S.
Ricoh & Company, Ltd.
Shoup Guy W.
Sugarman Scott J.
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