Compact, fast zoom lens system

Details Compact, fast zoom lens system Compact, fast zoom lens system

1992-07-24

1993-11-30

Arnold, Bruce Y.

Optical: systems and elements

Lens

With variable magnification

359683, G02B 1514

Patent

active

052670848

ABSTRACT:
The present invention provides a zoom lens system comprising, in order from the object side, a first lens unit G1 having a positive refracting power; a second lens unit G2 including a front subunit having at least one negative lens and a rear subunit having at least one negative lens and at least two positive lenses located more closely to the image side than said negative lens and having a positive refracting power as a whole, said front and rear subunits having a positive composite power; and a third lens unit G3 having a negative refracting power; said first, second and third lens units including gaps between them, which are variable for zooming from the wide to tele position. This compact, three-unit zoom lens system has a zoom ratio of about 2 or more but, nonetheless, has a small F-number or is fast

REFERENCES:
patent: 4398808 (1983-08-01), Fujibayashi
patent: 4629294 (1986-12-01), Tanaka et al.
patent: 4682860 (1987-07-01), Tanaka et al.
patent: 4773744 (1988-09-01), Yamanashi
patent: 4952038 (1990-08-01), Ito
patent: 4978204 (1990-12-01), Ito
patent: 4983027 (1991-01-01), Kojima et al.

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