Zoom lens

Details Zoom lens Zoom lens

1995-08-01

1998-07-14

Epps, Georgia Y.

Optical: systems and elements

Lens

With variable magnification

359679, 359708, G02B 1514, G02B 302

Patent

active

057813493

ABSTRACT:
A zoom lens is disclosed, comprising, in order from a screen, a first lens unit of negative refractive power including a first front lens sub-unit having at least one positive lens and at least one negative lens and, after a largest air separation in the first lens unit, a first rear lens sub-unit having at least one positive lens and at least one negative lens, and a second lens unit of positive refractive power including a second front lens sub-unit having at least one positive lens and at least one negative lens and, after a largest air separation in the second lens unit, a second rear lens sub-unit having at least one positive lens and at least one negative lens, zooming being performed by varying the separation between the first and second lens units.

REFERENCES:
patent: 4315669 (1982-02-01), Fujii
patent: 5134524 (1992-07-01), Hamano et al.
patent: 5179473 (1993-01-01), Yano et al.
patent: 5247393 (1993-09-01), Sugawara
patent: 5257134 (1993-10-01), Sugawara
patent: 5303088 (1994-04-01), Sugawara
patent: 5341243 (1994-08-01), Okuyama et al.
patent: 5579171 (1996-11-01), Suzuki et al.

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