Zoom lens and imaging apparatus

Details Zoom lens and imaging apparatus Zoom lens and imaging apparatus

2006-10-26

2008-08-12

Dang, Hung X. (Department: 2873)

Optical: systems and elements

Image stabilization

By movable refractive structure

C359S554000, C396S055000

Reexamination Certificate

active

07411731

ABSTRACT:
A zoom lens includes a varifocal lens unit including a plurality of movable lens groups, and a prism disposed on an image side of the varifocal lens unit. The prism has an incident plane into which a light flux from the varifocal lens unit enters, and an exit plane from which the light flux is emitted toward an image plane, the exit plane capable of being inclined with respect to an optical axis, the exit plane inclined in accordance with a following conditional expression “α=−f×θ/[Bf(n−1)]”, where α: an angle formed by a normal of the exit plane and the optical axis, f: a focus distance of a whole lens system, θ: a turning angle of a lens system, Bf: a distance from the exit plane of the prism to the image plane along the optical axis, and n: a refraction index of the prism.

REFERENCES:
patent: 5182671 (1993-01-01), Kitagishi et al.
patent: 6246520 (2001-06-01), Iizuka
patent: 6282376 (2001-08-01), Shiomi
patent: 2002/0102102 (2002-08-01), Watannabe et al.
U.S. Appl. No. 11/580,161, filed Oct. 13, 2006, Ohtake, et al.
U.S. Appl. No. 11/553,281, filed Oct. 26, 2006, Ohtake, et al.

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