Zoom lens

Details Zoom lens Zoom lens

1996-06-11

1998-02-03

Pham, Hoa Q.

Optical: systems and elements

Lens

With variable magnification

359791, 359714, G02B 1514

Patent

active

057150966

ABSTRACT:
A compact zoom lens with three movable lens units of positive, positive and negative optical powers, respectfully. During zooming, the axial distance between the first and the rear lens units changes less than the axial distance between the first lens unit and the middle lens unit; the middle lens unit is movable towards the object side at a relatively slower axial speed than that at which the first and third lens units are moved.

REFERENCES:
patent: 5069536 (1991-12-01), Ogata
patent: 5148321 (1992-09-01), Goto et al.
patent: 5325235 (1994-06-01), Takashima et al.
patent: 5327290 (1994-07-01), Fukushima et al.
patent: 5379154 (1995-01-01), Shibayama et al.
patent: 5424870 (1995-06-01), Hashimura et al.
patent: 5434711 (1995-07-01), Tetsuya et al.

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