Zoom lens, variable magnification group, camera unit and...

Details Zoom lens, variable magnification group, camera unit and... Zoom lens, variable magnification group, camera unit and...

2007-01-16

2007-01-16

Mack, Ricky (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S691000

Reexamination Certificate

active

10866830

ABSTRACT:
Disclosed is a zoom lens herein. The zoom lens has a first group G1having a negative focal length, a second group G2having a positive focal length and a third group G3having a positive focal length in turn from an object side, and has an opening iris S for moving integrally with the second group G2on the object side of the second group G2, wherein in variation of magnification from a short focus end to a long focus end, the second group G2moves monotonously from image side to object side and the first group G1moves to correct the variation in position of image surface accompanying the variation of magnification. The second group G2consists of four elements of a positive lens L4, a negative lens L5,a positive lens L6and a positive lens L7in turn from the object side.

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