Wide-angle zoom lens system

Details Wide-angle zoom lens system Wide-angle zoom lens system

2007-06-12

2007-06-12

Mack, Ricky (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S686000, C359S676000

Reexamination Certificate

active

11427075

ABSTRACT:
A wide-angle zoom lens system includes a negative first lens group, a positive second lens group, a negative third lens group and a positive fourth lens group, in this order from the object. Upon zooming from the short focal length extremity to the long focal length extremity, a distance between the negative first lens group and the positive second lens group decreases, a distance between the positive second lens group and the negative third lens group increases, and a distance between the negative third lens group and the positive fourth lens group decreases. The wide-angle zoom lens system satisfies the following conditions:in-line-formulae description="In-line Formulae" end="lead"?1.1<|f1|/fw<2.0(f1<0)   (1)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?2.0<f4/fw<3.5  (2)in-line-formulae description="In-line Formulae" end="tail"?in-line-formulae description="In-line Formulae" end="lead"?2.5<fBw/fw<3.5  (3)in-line-formulae description="In-line Formulae" end="tail"?

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English language Abstract of JP 10-082954.
English language Abstract of JP 10-325923.
English language Abstract of JP 2001-083421.
English language Abstract of JP 2001-318314.
English language Abstract of JP 2002-287031.
English language Abstract of JP 2004-061910.
English language Abstract of JP 2004- 240038.

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