Rear stop diaphragm zoom lens

Details Rear stop diaphragm zoom lens Rear stop diaphragm zoom lens

1981-12-09

1983-11-01

Corbin, John K.

G02B 964, G02B 1516

Patent

active

044127251

ABSTRACT:
A rear stop diaphragm type zoom lens is disclosed. The zoom lens is composed, in order from the object side, of a first lens group as a whole having a negative refractive power and consisting of two negative lenses and a positive lens and a second lens group as a whole having a positive refractive power and consisting of two or three positive lenses, a negative lens and one or two lenses including at least one positive lens. An aerial space between the lens groups is varied to thereby vary the magnification, and a stop diaphragm is disposed behind the overall lens system with the stop diaphragm being maintained at a constant position with respect to the focusing surface during variation of magnification.

REFERENCES:
patent: 4294521 (1981-10-01), Doi et al.
patent: 4380375 (1983-04-01), Mogami

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