Zoom lens system

Details Zoom lens system Zoom lens system

1992-10-09

1994-08-30

Look, Edward K.

Optical: systems and elements

Lens

With variable magnification

359708, 359713, G02B 1514

Patent

active

053433297

ABSTRACT:
The improved zoom lens system comprises at least three lens groups which are arranged, in order from the object side, as a first lens group having a positive focal length, a second lens group having a positive focal length and a third lens group having a negative focal length, wherein, when zooming is carried out from the wide-angle to the narrow-angle end, said first, second and third lens groups are moved towards the object so that the distance between said first and second lens groups is increased whereas the distance between said second and third lens groups is decreased. The system is characterized in that each of the first and second lens groups has at least one aspheric surface.

REFERENCES:
patent: 4773744 (1988-09-01), Yamanashi
patent: 4822152 (1989-04-01), Yamanashi
patent: 4854682 (1989-08-01), Yamanashi
patent: 4909613 (1990-03-01), Kikuchi
patent: 4955700 (1990-09-01), Yamaguchi
patent: 4983027 (1991-01-01), Kojima et al.
patent: 5173806 (1992-12-01), Ogata

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