1989-03-27
1991-04-30
Arnold, Bruce Y.
350413, 350423, 350426, G02B 1500, G02B 300, G02B 900
Patent
active
050112724
ABSTRACT:
A zoom lens including at least two lens units of which the front one is of positive refractive power and the rear one is of negative refractive power, the units being axially movable to decrease their separation in zooming from the wide angle to the telephoto end. At least one of the lens units is provided with at least one refractive index distribution type lens arranged on a common optical axis of the other lenses in order to achieve a great advance in compactness.
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patent: 4659186 (1987-04-01), Sato et al.
patent: 4726688 (1988-02-01), Nakayama et al.
patent: 4730906 (1988-03-01), Okudaira
Camera International No. 4, Apr. 1965, pp. 36-37.
Introduction to Classical and Modern Optics, Second Edition, Jurgen R. Meyer--Arendt, M.D., pp. 362-365 (1984).
"Design of a Gradient-Index Photographic Objective", Applied Optics, vol. 21, No. 6, pp. 993-998 (Mar. 15, 1982).
"Gradient-Index Wide-Angle Photographic Objective Design", Applied Optics, vol. 23, No. 11, pp. 1735-1741 (Jun. 1, 1984).
Hattori Jun
Horiuchi Akihisa
Kitagishi Nozomu
Nakayama Hiroki
Suda Shigeyuki
Arnold Bruce Y.
Canon Kabushiki Kaisha
Phan James
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