Zoom lens system

Details Zoom lens system Zoom lens system

1992-09-24

1994-11-08

Look, Edward K

Optical: systems and elements

Lens

With variable magnification

G02B 1514

Patent

active

053632435

ABSTRACT:
An improved zoom lens system is disclosed which includes 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. When zooming is carried out from the wide-angle to the narrow-angle end, the first, second and third lens groups are all moved towards the object so that the distance between the first and second lens groups is increased whereas the distance between the second and third lens groups is decreased. The system is characterized in that the second lens group has at least two aspheric surfaces.

REFERENCES:
patent: 4773744 (1988-09-01), Yamanshi
patent: 4822152 (1989-04-01), Yamanshi
patent: 4840467 (1989-06-01), Takada et al.
patent: 4854682 (1989-08-01), Yamanashi
patent: 4978204 (1990-12-01), Ito
patent: 5069536 (1991-12-01), Ogata

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