1988-08-08
1991-04-23
Arnold, Bruce Y.
G02B 1514
Patent
active
050094912
ABSTRACT:
A compact zoom lens system comprising from the object side to the image side, a first lens unit of a negative refractive power having a cemented lens component consisting of a negative lens element and a positive lens element cemented with each other, said first lens unit being shiftable along an optical axis of the lens system in zooming operation, a second lens unit of a positive refractive power having two positive lens components, at least one of which consists of a positive lens element and a negative lens element cemented with each other, said second lens unit being shiftable along the optical axis of the lens system in the zooming operation and a third lens unit of a positive refractive power having from the object side, a front lens component of a negative refractive power and a rear lens component of a positive refractive power, said third lens being stationary along the optical axis of the lens system in the zooming operation, in order to realize a zooming ratio of about two or three, a very short overall length and a light weight while having a large aperture by a configuration with a small number of lens elements.
REFERENCES:
patent: 4107402 (1979-10-01), Nakagawa
Arnold Bruce Y.
Gass Rebecca D.
Minolta Camera Kabushiki Kaisha
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