Ultra compact zoom lens

Details Ultra compact zoom lens Ultra compact zoom lens

1987-10-20

1988-11-01

Corbin, John K.

G02B 1516, G02B 962

Patent

active

047814470

ABSTRACT:
An ultra compact zoom lens system includes: a first lens unit having a positive refracting power and including a positive lens, a negative lens and a cemented lens comprised of a negative lens and a positive lens; a second lens unit having a negative refracting power and including a positive lens and a negative lens; and a third lens unit having a positive refractive power and including a positive lens. The second lens unit has a paraxial lateral magification which is always larger than unity and the third lens unit is fixed in position. And, the focal distance of the entire system is varied by varying a spacing between the first and second lens units and a spacing between the second and third lens units relative to each other. Selected parameters, such as focal distance, refractive index and dispersion, of selected lenses defining the present zoom lens system should have values within predetermined ranges so as to provide an ultra compact zoom lens system which provides an excellent image forming characteristic over the entire zooming range and which has a large zoom ratio.

REFERENCES:
patent: 4721371 (1988-01-01), Imai

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