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Zoom lens system and electronic image pickup apparatus using the same

A zoom lens and focal length technology, applied in optical components, instruments, optics, etc., can solve the problems of unfavorable high magnification change ratio, inability to reduce diameter, and magnification change ratio cannot reach 3 times, etc.

Inactive Publication Date: 2008-02-27
OLYMPUS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, in order to ensure the angle of view on the wide-angle side, the diameter of the lens closest to the object side in the first lens group cannot be reduced, which is not conducive to the miniaturization of the lens barrel in the diameter direction.
And even if the telescopic method is used, it is not conducive to the miniaturization of its thickness in the direction of the optical axis
[0010] In the fifth embodiment of Japanese Patent Application Laid-Open No. 2004-199000, the number of lenses is seven, and the number of configurations in the sixth and seventh embodiments is eight, which are relatively small, but in order to suppress the second lens The negative refractive power of the second lens group is suppressed due to the influence of group aberration, and as a result, the magnification change ratio will stop at about 3 times, which is not conducive to high magnification change ratio.
[0011] In addition, in the zoom lens described in Japanese Patent Laid-Open No. 2004-199000, the total number of lenses in the first lens group and the second lens group is three, and in Japanese Patent Laid-Open No. 11-119100 and Japanese Patent Laid-Open No. 2001-133687 In the zoom lens described in the publication No. 1, the total number of lenses in the first lens group and the second lens group is four, but it is difficult to suppress the influence of aberration fluctuations in the first lens group and the second lens group, and the magnification change ratio cannot be adjusted. up to 3 times

Method used

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  • Zoom lens system and electronic image pickup apparatus using the same
  • Zoom lens system and electronic image pickup apparatus using the same
  • Zoom lens system and electronic image pickup apparatus using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0413] Example 1 As shown in FIG. 1A to FIG. 1C , the first lens group G1 with positive refractive power, the second lens group G2 with negative refractive power, the brightness stop S, and the third lens group with positive refractive power are provided in order from the object side. Lens group G3, the fourth lens group G4 of positive refractive power.

[0414] When changing the magnification from the wide-angle end to the telephoto end, the first lens group G1 moves to the object side, the second lens group G2 moves to the image side, the third lens group G3 moves to the object side, and the fourth lens group G4 once moves to the object side. After moving to the side, reverse the moving direction and move to the image side.

[0415] The first lens group G1 is composed of a first negative meniscus lens with a convex surface facing the object side and a second biconvex positive lens in order from the object side. The second lens group G2 includes, in order from the object sid...

Embodiment 2

[0417] Example 2 As shown in FIG. 2A to FIG. 2C , it has the first lens group G1 of positive refractive power, the second lens group G2 of negative refractive power, the brightness stop S, and the third lens group of positive refractive power in order from the object side. Lens group G3, the fourth lens group G4 of positive refractive power.

[0418] When changing the magnification from the wide-angle end to the telephoto end, the first lens group G1 moves to the object side, the second lens group G2 once moves to the image side, then reverses the moving direction and moves to the object side, and the third lens group G3 moves to the object side. The object side moves, and the fourth lens group G4 once moves toward the object side, then reverses the moving direction and moves toward the image side.

[0419] The first lens group G1 is composed of a first negative meniscus lens with a convex surface facing the object side and a second biconvex positive lens in order from the obj...

Embodiment 3

[0421] Example 3 As shown in FIGS. 3A to 3C , the first lens group G1 with positive refractive power, the second lens group G2 with negative refractive power, the brightness stop S, and the third lens group with positive refractive power are provided in order from the object side. Lens group G3, the fourth lens group G4 of positive refractive power.

[0422] When changing the magnification from the wide-angle end to the telephoto end, the first lens group G1 moves to the object side, the second lens group G2 moves to the image side, the third lens group G3 moves to the object side, and the fourth lens group G4 moves to the object side move.

[0423] The first lens group G1 is composed of a first negative meniscus lens with a convex surface facing the object side and a second biconvex positive lens in order from the object side. The second lens group G2 is composed of a third biconcave negative lens and a fourth positive meniscus lens whose convex surface faces the object side...

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PUM

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Abstract

There is disclosed a zoom lens system comprising: in order from an object side, a first lens unit having a positive refractive power; a second lens unit having a negative refractive power; a third lens unit having a positive refractive power; and a fourth lens unit having a refractive power, during zooming from a wide-angle end to a telephoto end, a space between the first lens unit and the second lens unit, a space between the second lens unit and the third lens unit and a space between the third lens unit and the fourth lens unit are changed, and the second lens unit includes two lenses of a negative lens and a positive lens in order from the object side.

Description

[0001] This application claims priority to Japanese Patent Application No. 2006-229220 filed in Japan on August 25, 2006, and Japanese Patent Application No. 2006-229300 filed in Japan on August 25, 2006, and hereby Merge references to their contents. technical field [0002] The present invention relates to a zoom lens and an electronic imaging device using the zoom lens. Background technique [0003] In recent years, instead of silver halide film cameras, digital cameras that use electronic imaging elements such as CCDs and CMOSs ​​to photograph subjects have become mainstream. Furthermore, there are various types ranging from a high-performance type for business use to a compact popular type. Users of such popular digital cameras want to easily enjoy shooting in various scenes anytime, anywhere. Therefore, small-sized products, especially digital cameras that are easy to carry in pockets of clothes or bags, and thin in the thickness direction are popular. [0004] On t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B15/16G02B9/34G02B13/18
Inventor 左部校之
Owner OLYMPUS CORP