Zoom lens system

Details Zoom lens system Zoom lens system

1992-06-23

1995-05-16

Epps, Georgia Y.

Optical: systems and elements

Lens

With variable magnification

359676, 359686, G02B 1514

Patent

active

054166390

ABSTRACT:
A zoom lens system comprising a plurality of lens units, concretely in order from the object side, a first lens unit having negative refractive power, a second lens unit having positive refractive power, a third lens unit having negative refractive power and a fourth lens unit having positive or negative refractive power; wherein said zoom lens system is zoomed by moving the second lens unit, the third lens unit and the fourth lens unit so that locations of these lens units at a tele position are on the object side of locations thereof at a wide position, and said zoom lens system is focused by moving one of more lens components disposed in the first lens unit. This zoom lens system has a total length which is kept substantially constant regardless of zooming and focusing.

REFERENCES:
patent: 3532415 (1970-10-01), Baluteau et al.
patent: 3549235 (1970-12-01), Macher
patent: 3682534 (1972-08-01), Cook et al.
patent: 4099845 (1978-07-01), Takesi et al.
patent: 4516839 (1985-05-01), Tokumaru
patent: 4759617 (1988-07-01), Tokumaru
patent: 5078481 (1992-01-01), Nakayama et al.

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