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发明授权
US07408720B2 Zoom lens and image pickup apparatus having same 有权
具有相同的变焦镜头和摄像装置

Zoom lens and image pickup apparatus having same
摘要：
A zoom lens has a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, which is moved during zooming, a third lens unit having a positive refractive power, and a fourth lens unit having a positive refractive power, which is moved during zooming, arranged in the mentioned order from the object side to the image side. The zoom lens satisfies the following conditions: 0.15
摘要（中）：

变焦透镜具有正屈光力的第一透镜单元，具有负折射力的第二透镜单元，其在变焦期间移动，具有正折光力的第三透镜单元和具有正折光力的第四透镜单元 ，其在变焦期间移动，以从物体侧到图像侧的所述顺序排列。 变焦镜头满足以下条件：<？in-line-formula description =“In-line Formulas”end =“lead”？> 0.15 <| f2 | /√{平方根（（fwxft））} <0.27和 <？in-line-formula description =“In-line Formulas”end =“tail”？> <？in-line-formula description =“In-line Formulas”end =“lead”？> 5.4021 f3 / fw <10.00 ，其中f 2和f 3分别是第二和第三透镜单元的焦距，fw和ft是焦距， 的变焦镜头分别在广角端和远摄端。

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