Zoom lens system

Details Zoom lens system Zoom lens system

1996-07-05

1998-07-28

Pham, Hoa Q.

Optical: systems and elements

Lens

With variable magnification

359713, 359791, G02B 1516

Patent

active

057869448

ABSTRACT:
A zoom lens system comprises, from the object side, a first lens unit having a positive refractive power, a second lens unit having a positive refractive power and a third lens unit having a negative refractive power. During zooming, the sizes of the first area of empty space between the first lens unit and the second lens unit and the second area of empty space between the second lens unit and the third lens unit change.

REFERENCES:
patent: 4185893 (1980-01-01), Ogawa et al.
patent: 5216547 (1993-06-01), Ogata
patent: 5260833 (1993-11-01), Ito et al.
patent: 5325235 (1994-06-01), Takashima et al.
patent: 5343329 (1994-08-01), Ito
patent: 5353159 (1994-10-01), Morooka

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