Wide-angle zoom lens system

Details Wide-angle zoom lens system Wide-angle zoom lens system

1991-01-08

1992-12-08

Gonzalez, Frank

Optical: systems and elements

Lens

With variable magnification

359708, G02B 1500

Patent

active

051702924

ABSTRACT:
A zoom lens system comprising, in the order from the object side, a first lens unit having a positive refractive power, a second lens unit having a weak refractive power (i.e., less than 0.01), a third lens unit having a positive refractive power and a fourth lens unit having a negative refractive power, and adapted so as to perform variation of focal length thereof by varying airspaces reserved between the lens units. This zoom lens system has a broad vari-focal range covering a super wide field angle.

REFERENCES:
patent: 4666257 (1987-05-01), Tanaka et al.
patent: 4749267 (1988-06-01), Mihara
patent: 4822152 (1989-04-01), Yamanashi
patent: 4953957 (1990-09-01), Kobayashi
patent: 4976521 (1990-12-01), Ishii et al.

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