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Zoom lens and imaging apparatus

一种变焦透镜、正透镜的技术，应用在图像通信、电视、光学等方向，能够解决后截距长等问题，达到长后截距的效果

Inactive Publication Date: 2009-09-16
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In this patent document 4, the third group is positive, but in order to make the back intercept long, it is advantageous to make the third group negative

Method used

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  • Zoom lens and imaging apparatus

Examples

Experimental program
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Effect test

Embodiment 1

[0113] In the zoom lens of Example 1, the second group 20 and the fourth group 40 move on the optical axis as the magnification changes. Therefore, the values ​​of the surface intervals D7, D14, D22, and D27 before and after these groups are variable. in Picture 12 (B) shows the values ​​of the wide-angle end and the telephoto end as data at the time of zooming of these surface intervals D7, D14, D22, and D27. In addition, the values ​​of the paraxial focal length f (mm), F number (FNO.), and angle of view 2ω (ω: half angle of view) of the entire system at the wide-angle end and the telephoto end are also shown. In addition, as these values, the values ​​for the e-line are shown.

[0114] in Picture 11 In the lens data, the mark [*] attached to the left side of the surface number indicates that the lens surface is aspherical. In the zoom lens of Example 1, the object-side surface S8 of the 21st lens L21 of the second group 20 and both surfaces S26 and S27 of the 43rd lens L43 of...

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PUM

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Abstract

The invention provides a zoom lens for implementing wide-angle and high zoom ratio while assuring long rear cut-off distance. The zoom lens includes: in order from an object side thereof, a first group (10) having a positive refractive power; a second group (20) having a negative refractive power; a stop (St); a third group (30) having a negative refractive power; and a fourth group (40) having a positive refractive power. Power variation from a wide angle end to a telephoto end of the zoom lens is performed by moving the second group (20) to an image side along an optical axis thereof, while the first group (10) and the third group (30) are fixed, and correction of an image plane caused by the power variation and focusing is performed by moving the fourth group (40) along the optical axis. The third group (30) includes two positive lens (L31,L32) and two negative lens (L33,L34).

Description

Technical field [0001] The present invention relates to a compact and high-magnification zoom lens and an imaging device used in a civilian camera or a surveillance camera. Background technique [0002] In recent years, in zoom lenses used in video cameras and the like, there has been an increasing demand for miniaturization. Generally, in a civilian camera, a four-group structure with positive, negative, positive, and positive refractive power is used from the object side to fix the first lens group and the third lens group so that the second lens group is along the optical axis. The movement is mainly used for zooming, and the correction and focusing of the image plane accompanying this zooming are performed by the fourth group. Such a rear focus type 4-group zoom lens becomes the mainstream. [0003] In this type of 4-group zoom lens, high magnification and wide field of view are required for use as a surveillance video camera. Furthermore, in order to support a video camera o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B15/167G02B15/163G02B9/36H04N5/225
CPCG02B15/17G02B15/145109
Inventor 河村大树
Owner FUJIFILM CORP
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