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Zoom lens system and camera including zoom lens system

一种变焦透镜、负透镜的技术，应用在变焦透镜系统领域

Active Publication Date: 2008-08-27
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0024] However, even if a lens made of ceramics is simply used for a zoom lens, it is difficult to obtain high optical performance for the entire zoom range

Method used

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  • Zoom lens system and camera including zoom lens system
  • Zoom lens system and camera including zoom lens system
  • Zoom lens system and camera including zoom lens system

Examples

Experimental program
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Embodiment Construction

[0067] A zoom lens system and an image pickup apparatus including one of the zoom lens systems according to exemplary embodiments of the present invention are described below.

[0068] The zoom lens according to each embodiment includes, in order from the object side to the image side: a first lens unit having a positive refractive power (ie, refractive power=reciprocal of the focal length); a second lens unit having a negative refractive power; and A rear assembly of at least one lens unit. When zooming, at least the second lens unit moves such that a distance between the first lens unit and the second lens unit is larger at the telephoto end than at the wide-angle end.

[0069] Furthermore, the rear assembly includes at least one lens unit having a positive refractive power.

[0070] For example, the rear assembly includes a third lens unit having a positive refractive power and a fourth lens unit having a positive refractive power in order from the object side to the image...

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Abstract

The present invention provides a zoom lens system and a camera containing the same. The zoom lens system includes, in order from an object side to an image side, a first lens unit having a positive optical power, a second lens unit having a negative optical power, and a rear lens component including at least one lens unit. When zooming is performed, the second lens unit is movable so that a distance between the first lens unit and the second lens unit at a telephoto end is greater than that at a wide-angle end. The second lens unit includes a negative lens element made of a material having a high index of refraction and satisfying predetermined conditions.

Description

technical field [0001] The present invention relates to a zoom lens system and a video camera comprising the zoom lens system. Background technique [0002] In recent years, image pickup devices including solid-state image pickup elements such as video cameras, digital still cameras, broadcast cameras, and security cameras, and silver halide film cameras have been functionally developed. Furthermore, image pickup devices have been reduced in size. [0003] Therefore, imaging optical systems (zoom lenses) used in these image pickup devices are required to have a short lens length, small size, high zoom ratio, and high resolution. [0004] In order to meet these demands, rear focus type zoom lenses have been developed. The post focus type zoom lens includes a first lens unit disposed closest to an object, and other lens units. Focusing is performed by moving other lens units. [0005] One type of post-focus type zoom lens is a four-unit zoom lens that sequentially includes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B15/16G02B9/34
CPCG02B15/161G02B15/142G02B15/144113
Inventor 木村友纪
Owner CANON KK
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