Wide angle zoom lens

Details Wide angle zoom lens Wide angle zoom lens

1983-11-14

1984-09-04

Corbin, John K.

350432, G02B 1318, G02B 1514

Patent

active

044694121

ABSTRACT:
The wide angle zoom lens disclosed includes, from front to rear, a negative first lens group and a positive second lens group, both of which are moved axially in variable relation to each other to effect a change in the image magnification. The first lens group includes, front to rear, a first lens with a rear surface of strong negative refractive power, a second lens of convex curvature towards the front with a focal length having an absolute value not less than 30 times the shortest focal length of the entire system and with at least one of the surfaces thereof aspherical and a positive meniscus 3rd lens of forward convexity. According to one embodiment, the second lens is made of glass and according to another, of plastic.

REFERENCES:
patent: 3880498 (1975-04-01), Liu et al.
patent: 4153339 (1979-05-01), Tajima et al.
patent: 4159865 (1979-07-01), Kawamura et al.
patent: 4241981 (1980-12-01), Okudaira
patent: 4400064 (1983-08-01), Ikemori et al.

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