Zooming lens system and device using the zooming lens system

Details Zooming lens system and device using the zooming lens system Zooming lens system and device using the zooming lens system

2006-12-19

2006-12-19

Sugarman, Scott J. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S690000

Reexamination Certificate

active

07151638

ABSTRACT:
A zooming lens apparatus including a first optical lens group having a positive refractive power, a second optical lens group having a negative refractive power, a third optical lens group having a positive refractive power, and a fourth optical lens group having a positive refractive power. The zooming lens apparatus also includes an aperture diaphragm arranged between the second and third optical lens group. When a scaling of the zooming lens system is changed from a wide-angle limit to a telescopic limit, the first optical lens group and the third optical lens group are moved in a first direction, and the fourth optical lens group is moved in a second direction opposite of the first direction. The zooming lens apparatus satisfies an inequality condition 0.60<m4T<0.85, where m4Trepresents an imaging magnification of the fourth optical lens group at the telescopic limit.

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