Invention Grant
US08970967B2 Zoom lens, image-pickup apparatus having the same, and image projection apparatus having the same 有权
变焦镜头,具有该镜头的摄像装置和具有该变焦镜头的图像投影装置

Zoom lens, image-pickup apparatus having the same, and image projection apparatus having the same
Abstract:
The zoom lens includes, in order from an object side to an image side, a first lens unit having a negative refractive power, a rear unit including one or more lens units, a distance between every adjacent lens units varies during zooming, and an aperture diaphragm on the image side of the first lens unit, a combined focal length of the rear unit at a wide-angle end being positive. One lens unit LG on the object side of the aperture diaphragm is made of a solid material, and includes an optical element GnNL having a negative refractive power and another optical element having a positive refractive power, and the predetermined conditions are satisfied.
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