1977-12-20
1979-10-02
Clark, Conrad J.
350177, 350184, G01B 1516
Patent
active
041696603
ABSTRACT:
The wide-angle zoom lens system comprises a divergent lens group and a convergent lens group in the order from the object side, both of the lens groups being movable on the optical axis of the lens system to vary the air space between the two groups so that the magnification of the image is variable while the image plane is being maintained at a fixed position. The divergent lens group includes four air-spaced components which are, in the order from the object side, a first positive component with the more curved surface facing the object side, a first negative component with the more curved surface facing the image side, a second negative component with the more curved surface facing the image side and a first positive meniscus component convex to the object side. The first positive component and the first negative component define therebetween an air chamber having convergent power. The first negative component and the second negative component define therebetween an air chamber having divergent power with its more curved surface facing the object side. The axial space between the second negative component and the first positive meniscus component is greater than the space between the first positive component and the first negative component. The convergent lens group includes at least four positive components and a negative component intervening among the positive components, all components being separated from one another.
REFERENCES:
patent: 3030863 (1962-04-01), Schwartz et al.
patent: 3143590 (1964-08-01), Higuchi
patent: 3152210 (1964-10-01), Gustafson
patent: 3771853 (1973-11-01), Nakamura
patent: 3848969 (1974-11-01), Tajima
patent: 3880498 (1975-04-01), Liu et al.
Clark Conrad J.
Nippon Kogaku K.K.
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