Zoom lens system

Details Zoom lens system Zoom lens system

1993-10-14

1995-08-15

Epps, Georgia Y.

Optical: systems and elements

Lens

With variable magnification

359676, 359714, 359765, G02B 1514

Patent

active

054424852

ABSTRACT:
A zoom lens system comprising at least five lens units, in order from the object side, of a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a negative refractive power, a fourth lens unit having a positive refractive power and a fifth lens unit having a positive refractive power. This zoom lens system is configured so as to change a magnification thereof by moving the first through fifth lens units, and has wide field angles, a high vari-focal ratio and a compact size.

REFERENCES:
patent: 3975089 (1976-08-01), Betensky
patent: 4113356 (1978-09-01), Matsubara
patent: 4299454 (1981-11-01), Betensky
patent: 4437732 (1984-03-01), Ishiyama
patent: 4576445 (1986-03-01), Inadome
patent: 4812024 (1989-03-01), Mukaiya
patent: 4832471 (1989-05-01), Humano
patent: 4846563 (1989-07-01), Mukaiya
patent: 5061051 (1991-10-01), Miyamae
patent: 5095387 (1992-03-01), Horiuchi
patent: 5301064 (1994-04-01), Sugi et al.

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