Zoom lens device

Details Zoom lens device Zoom lens device

2008-07-29

2008-07-29

Thompson, Timothy J (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S686000

Reexamination Certificate

active

07405886

ABSTRACT:
A zoom lens device includes, in sequence from an object side to an imaging side, a negative first lens group, a positive second lens group, and a positive third lens group. When the zoom lens device is moved from a wide-angle condition to a telephoto condition, the second lens group moves towards the object side while the first lens group moves firstly towards the imaging side and then towards the object side to thereby reducing the distance between the first and second lens groups. The third lens group moves only when the zoom lens devices focuses.

REFERENCES:
patent: 6259508 (2001-07-01), Shigematsu
patent: 7113346 (2006-09-01), Souma et al.
patent: 7126759 (2006-10-01), Sensui
patent: 7167320 (2007-01-01), Ohashi

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