Compact small format zoom lens

Details Compact small format zoom lens Compact small format zoom lens

1993-11-30

1996-07-16

Epps, Georgia Y.

Optical: systems and elements

Lens

With variable magnification

359691, G02B 1514

Patent

active

055372546

ABSTRACT:
A zoom lens particularly suitable for use in a camera using small format film has two moving lens groups, a front negative group and a rear positive group. The rear positive group has a stop, a positive component and a negative component movable as a unit. The positive and negative components are substantially separated, for example, by more than 30 percent of the length of the lens in the wide angle position.

REFERENCES:
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patent: 4936661 (1990-06-01), Betensky et al.
patent: 4976522 (1990-12-01), Igarashi
patent: 5076677 (1991-12-01), Sato
patent: 5153777 (1992-10-01), Okada et al.
patent: 5270867 (1993-12-01), Estelle
patent: 5315440 (1994-05-01), Betensky et al.
patent: 5329402 (1994-07-01), Sato
patent: 5339195 (1994-08-01), Ogata
patent: 5381268 (1995-01-01), Sato
U.S. patent application Ser. No. 07/792,504, filed Nov. 4, 1991, Now U.S. Pat. No. 5,315,440 issued May 24, 1994.
U.S. patent appliction Ser. No. 07/807,541, filed Dec. 13, 1991, now U.S. Pat. No. 5,270,867 issued Dec. 14, 1993.

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