Bright wide-angle zoom lens

Details Bright wide-angle zoom lens Bright wide-angle zoom lens

1986-05-30

1988-03-15

Corbin, John K.

350413, 350458, G02B 1514, G02B 1318, G02B 1304, G02B 964

Patent

active

047309067

ABSTRACT:
A compact and high-performance bright wide-angle zoom lens comprising, in order from the object side, a front group having a negative refractive power and a rear group having a positive refractive power, with a stop diaphragm being disposed between the front and rear groups. The front group, stop diaphragm and rear groups are capable of independent mechanical movement in response to a change in the focal length of the overall system. The rear group having a positive refractive power is composed, in order from the object side, of a positive lens unit, a negative lens unit, and a positive lens unit, with a lens element having a refractive index gradient profile along the optical axis being disposed in the positive lens unit on the image side of the rear group.

REFERENCES:
patent: 3729253 (1973-04-01), Moore et al.
patent: 4367927 (1983-01-01), Fujii
patent: 4571032 (1986-02-01), Somega et al.

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