Zoom lens system

Details Zoom lens system Zoom lens system

1994-03-25

1996-12-10

Nelms, David C.

Optical: systems and elements

Lens

With variable magnification

359683, 359676, G02B 1514

Patent

active

055837018

ABSTRACT:
A compact, wide-angle, fast zoom lens system of high optical performance which enables photography in the range of from the wide-angle region to the telephoto region. The zoom lens system has a 1-st lens unit (G1) of positive refractive power, a 2-nd lens unit (G2) of negative refractive power, a 3-rd lens unit (G3) of positive refractive power, a 4-th lens unit (G4) of positive refractive power, and a 5-th lens unit (G5) of positive refractive power. When zooming from the wide end toward the tele end is effected, the 1-st lens unit (G1), the 2-nd lens unit (G2), the 3-rd lens unit (G3) and the 4-th lens unit (G4) are movable, while the 5-th lens unit (G5) is fixed. The zoom lens system satisfies a condition that regulates the refractive powers of the 1-st lens unit (G1) and the 3-rd lens unit (G3), a condition that regulates the refractive power of the 2-nd lens unit (G2), a condition that regulates the relationship between the refractive powers of the 3-rd lens unit (G3) and the 4-th lens unit (G4), and conditions that regulate the amount of movement of the lens units during zooming.

REFERENCES:
patent: 4501475 (1985-02-01), Fujita et al.

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