Zoom optical system and electronic imaging apparatus using...

Optical: systems and elements – Lens – With variable magnification

Reexamination Certificate

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C359S682000, C359S684000

Reexamination Certificate

active

11716306

ABSTRACT:
A zoom optical system has, in order from the object side, a first lens unit with negative refracting power, including a single lens component; a second lens unit with positive refracting power, simply moved toward the object side when the magnification of the zoom optical system is changed in the range from a wide-angle position to a telephoto position; a third lens unit with negative refracting power; and a fourth lens unit with positive refracting power. In focusing on an object point separated at least 300 times a focal length at the wide-angle position, when the magnification is changed in the range from the wide-angle position to the telephoto position, the third lens unit and the fourth lens unit are moved together so that a relative spacing between the third lens unit and the fourth lens unit is widened or the fourth lens unit approaches an imaging point.

REFERENCES:
patent: 5078481 (1992-01-01), Nakayama et al.
patent: 6349002 (2002-02-01), Shibayama et al.
patent: 2002/0008920 (2002-01-01), Mihara et al.
patent: 2002/0057502 (2002-05-01), Ishii et al.
patent: 11-211984 (1999-08-01), None

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