Zoom lens and image taking system having the same

Details Zoom lens and image taking system having the same Zoom lens and image taking system having the same

2008-07-30

2009-08-25

Lester, Evelyn A. (Department: 2873)

Optical: systems and elements

Lens

With variable magnification

C359S683000, C359S684000, C359S685000, C359S686000, C359S689000, C359S713000, C359S714000, C359S715000, C359S716000, C359S726000, C359S737000, C359S740000

Reexamination Certificate

active

07580199

ABSTRACT:
A zoom lens includes a focus unit, a zoom unit, an aperture stop, and an imaging unit having a splitting element that are arranged in that order from an object side to an image side. The splitting element includes an incident surface for a light beam, a half mirror surface for splitting the light beam into reflected light and transmitted light, a splitting exit surface from which the reflected light is emitted, and an exit surface from which the transmitted light is emitted. The incident surface and the exit surface are perpendicular to an optical axis of the zoom lens. The ratio of the distance from the aperture stop to the exit surface and the equivalent air length from the aperture stop to an image plane of the zoom lens and the ratio of the effective diameters of the exit surface and the splitting exit surface are set properly.

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