Vari-focal optical system

Details Vari-focal optical system Vari-focal optical system

2006-05-09

2006-05-09

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S686000

Reexamination Certificate

active

07042651

ABSTRACT:
A vari-focal optical system having a composition comprising at least a first negative lens unit, a second positive lens unit, a third negative lens unit and a fourth positive lens unit, and changes a magnification from a wide position to a tele position by moving at least the second lens unit and the third lens unit. This optical system is configured to have a short total length and reserve sufficient airspaces for the magnification change by locating a front principal point of the second lens unit on the object side of the second lens unit.

REFERENCES:
patent: 5585970 (1996-12-01), Shibayama
patent: 5631775 (1997-05-01), Shibata
patent: 5805350 (1998-09-01), Yamamoto
patent: 5999329 (1999-12-01), Ohtake
patent: 6163410 (2000-12-01), Nagaoka
patent: 6317270 (2001-11-01), Nagaoka
patent: 6618198 (2003-09-01), Endo
patent: 6930839 (2005-08-01), Hagimori et al.
patent: 10-330034 (1998-12-01), None

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