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Zoom lens and image pickup apparatus including the same

一种变焦透镜、正透镜的技术，应用在成像系统领域，能够解决高光学性能难、难色差、透镜结构不对称等问题，达到高光学性能的效果

Inactive Publication Date: 2009-07-22
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in negative-lead zoom lenses, due to the significant asymmetry of the lens structure, it is difficult to properly correct chromatic aberration caused when the object distance changes even when using the float method
Thus, it is very difficult to achieve high optical performance over the entire range of object distances

Method used

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  • Zoom lens and image pickup apparatus including the same
  • Zoom lens and image pickup apparatus including the same
  • Zoom lens and image pickup apparatus including the same

Examples

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Embodiment Construction

[0042] Zoom lenses according to embodiments of the present invention and an image pickup apparatus including the zoom lens according to at least one embodiment will be described in detail below with reference to the accompanying drawings.

[0043] Each zoom lens according to an embodiment of the present invention includes a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, and a rear lens unit including one or more lens units in order from the object side to the image side. unit. Zooming is performed by changing the distance between these lens units.

[0044] Furthermore, a first focusing unit and a second focusing unit are provided, which are moved independently of each other during focusing.

[0045] Focusing is performed by appropriately moving the first and second focusing units so as to reduce variations in aberrations (especially variations in chromatic aberration) over the entire range of object distances. In this...

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Abstract

The invention relates to a zoom lens and an image pickup apparatus including the same. The zoom lens includes a first lens unit having a negative refractive power, a second lens unit having a positive refractive power, and a rear unit including one or more lens units, which are arranged in order from the object side to the image side. The zoom lens performs zooming by changing distances between the first, second, and rear lens units. A first focusing unit and a second focusing unit which move independently of each other during focusing are provided. The first and second focusing units are adequately set.

Description

technical field [0001] The present invention relates to a zoom lens and an image pickup device including the zoom lens. The invention is applicable, for example, to imaging systems for digital still cameras, video cameras, and silver halide film cameras. Background technique [0002] A negative-lead zoom lens is known in which a lens unit having a negative refractive power is arranged at a position closest to the object side. A negative-lead zoom lens has a relatively small close-up distance and can increase the field of view relatively easily. In addition, the back focus can also be easily increased. Therefore, negative-lead zoom lenses are often used as wide-field-of-view imaging lenses. [0003] A zoom lens including at least four lens units (ie, a lens unit with negative refractive power, a lens unit with positive refractive power, a lens unit with negative refractive power, and a lens unit with positive refractive power arranged in order from the object side) has bee...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B15/16G02B15/177G02B9/00
CPCG02B15/177G02B27/646G02B15/1435G02B15/144511
Inventor 远藤宏志
Owner CANON KK