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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 problem of full length, etc., to achieve the effect of ensuring brightness and optical performance

Inactive Publication Date: 2009-10-21
OLYMPUS CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] In Example 2 of Japanese Patent Laid-Open No. 2006-78979, although the magnification change ratio is about 4.5 times, its overall length is long

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

[0232] Example 1 as Figure 1A to Figure 1C As shown, in order from the object side, there are first lens group G1 of positive refractive power, second lens group G2 of negative refractive power, brightness diaphragm S, third lens group G3 of positive refractive power, and third lens group of positive refractive power. 4 lens group G4.

[0233] 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.

[0234] 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 side, a third biconc...

Embodiment 2

[0236] Example 2 as Figure 2A to Figure 2CAs shown, in order from the object side, there are first lens group G1 of positive refractive power, second lens group G2 of negative refractive power, brightness diaphragm S, third lens group G3 of positive refractive power, and third lens group of positive refractive power. 4 lens group G4.

[0237] 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 sideways, move to the image side.

[0238] 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 side, a third biconcave negative lens and a fourth positi...

Embodiment 3

[0240] Example 3 as Figure 3A to Figure 3C As shown, in order from the object side, there are first lens group G1 of positive refractive power, second lens group G2 of negative refractive power, brightness diaphragm S, third lens group G3 of positive refractive power, and third lens group of positive refractive power. 4 lens group G4.

[0241] 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. Move sideways and then move to the image side.

[0242] 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 side, a third biconcave negative lens and a fourth posit...

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Abstract

There is disclosed a zoom lens system comprising, in order from an object side, a positive first lens unit, a negative second lens unit, a positive third lens unit and a fourth lens unit having a refractive power, during magnification change 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 change, the second lens unit has a double-concave negative lens closest to the object side, and includes two or less negative lenses and one positive lens as a whole, the total number of the lenses of the second lens unit is two or three, and the following conditions are satisfied: 0.0 3.8 G02B 15 / 16 G02B 9 / 34 G02B 13 / 18 19 45 4 2007 / 8 / 24 101131467 2008 / 2 / 27 000000000 Olympus Corp. Japan Satori Tomoyuki huanglun wei 11127 San You Patent Agency No.201 Entrance 1, Building 13, the East of Jinmenli, Haidian District, Beijing 100088 Japan 2006 / 8 / 25 2006-229268

Description

[0001] This application claims priority to Japanese Patent Application No. 2006-229,268 filed in Japan on August 25, 2006, and the contents thereof are incorporated herein by reference. 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 CCD image sensors (CCD image sensors) or CMOS type image sensors (CMOS type image sensors) 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 and 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. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B15/16G02B9/34G02B13/18
CPCG02B15/173G02B15/144113
Inventor 左部校之
Owner OLYMPUS CORP