Zoom lens

Details Zoom lens Zoom lens

1991-01-10

1992-12-29

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359684, 359708, G02B 1514, G02B 1318

Patent

active

051756480

ABSTRACT:
A zoom lens comprising a negative first lens unit, a positive second lens unit, and a negative third lens unit and having a small backfocus, in which a refracting power of the third lens unit can be intensified to thereby provide a compact zoom lens. An aberration resulting from intensifying the refracting power is corrected by introducing an aspherical surface into the second lens in particular. Furthermore, the first lens unit is divided into two lens components, and the first lens unit is let out while varying a spacing between the two lens components at the time of focussing whereby focussing can be made with less extension amount from an infinite far point to a near distance while preventing degradation of aberrations.

REFERENCES:
patent: 4303311 (1981-12-01), Nakamura
patent: 4854682 (1989-08-01), Yamanashi

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