Lens unit and image pickup apparatus

Details Lens unit and image pickup apparatus Lens unit and image pickup apparatus

2007-07-02

2008-12-16

Choi, William C (Department: 2873)

Optical: systems and elements

Lens

With light limiting or controlling means

C359S740000, C359S690000, C359S691000, C359S784000, C359S785000, C359S793000

Reexamination Certificate

active

07466500

ABSTRACT:
A lens unit according to the present invention is capable of varying power for forming an image onto an image pickup element. The lens unit includes: a plurality of lens groups, a diaphragm, and a shutter. In the plurality of lens groups, a distance between a k-th lens group counting from an object side and a (k+1)-th lens group arranged at an image side of the k-th lens group changes for varying power. The diaphragm is arranged between a position at an image side of the k-th lens group and a lens surface facing the object side of a lens closest to the image in the (k+1)-th lens group. The shutter is provided with an aperture in a noncircular shape and fulfills the predetermined conditional formulas.

REFERENCES:
patent: 6072637 (2000-06-01), Okada et al.
patent: 6870691 (2005-03-01), Konno
patent: 2005/0285970 (2005-12-01), Yamaguchi et al.

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