Zoom lens with short back focal length

Details Zoom lens with short back focal length Zoom lens with short back focal length

1992-06-25

1998-04-21

Sugarman, Scott J.

Optical: systems and elements

Lens

With variable magnification

359689, 359708, 359713, 359714, 359715, 359716, G02B 1514, G02B 1318

Patent

active

RE0357758

ABSTRACT:
A two lens unit zoom lens of plus, minus configuration where the rear negative group provides the primary variator function and the positive first lens unit consists of a negative sub-unit and a positive sub-unit and where the sub-units may move differentially during zooming.

REFERENCES:
patent: 4304466 (1981-12-01), Betensky
patent: 4636040 (1987-01-01), Tokumaru
patent: 4659186 (1987-04-01), Sato et al.
patent: 4679913 (1987-07-01), Sato et al.
patent: 4682860 (1987-07-01), Tanaka et al.
patent: 4720179 (1988-01-01), Ito
patent: 4721371 (1988-01-01), Imai
patent: 4772106 (1988-09-01), Ogata et al.
patent: 4815830 (1989-03-01), Sato et al.
patent: 4830476 (1989-05-01), Aoki

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