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Zoom lens system

A technology of zoom lens and lens, which is applied in the field of zoom lens system, can solve the problems of not being able to maintain optical performance, and achieve the effect of short overall length and high resolution

Inactive Publication Date: 2009-09-23
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore the optical performance cannot be maintained

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1 to 5

[0204] Figure 1A to Figure 1C is a configuration diagram of the zoom lens system according to Embodiment 1. Figure 3A to Figure 3C is a configuration diagram of a zoom lens system according to Embodiment 2. Figure 5A to Figure 5C is a configuration diagram of a zoom lens system according to Embodiment 3. Figure 7A to Figure 7C is a configuration diagram of a zoom lens system according to Embodiment 4. Figure 9A to Figure 9C is a configuration diagram of a zoom lens system according to Embodiment 5. Each figure shows the zoom lens system at infinity focus. Figure 1A , 3A, 5A, 7A, and 9A show that at the wide-angle limit (the shortest focal length condition: the focal length is f W ) under the lens structure. Figure 1B , 3B, 5B, 7B and 9B show that at intermediate positions (intermediate focal length condition: focal length f M =√(f W *f T ))) lens structure. Figure 1C , 3C, 5C, 7C and 9C show that at the telephoto limit (longest focal length condition: focal lengt...

Embodiment 6

[0332] Figure 16 is a cross-sectional configuration diagram of a digital camera according to Embodiment 6. exist Figure 16 Among them, a digital camera is composed of the following devices: an imaging device including a zoom lens system 1 and a CCD solid-state image sensor 2; a liquid crystal display monitor 3; a main body 4, and the like. The zoom lens system 1 employed is the zoom lens system according to Embodiment 1. exist Figure 16 , the zoom lens system includes: a first lens unit G1, a second lens unit G2, an aperture A and a third lens unit G3. In the main body 4 , the zoom lens system 1 is provided on the front side of the main body, and the CCD solid-state image sensor 2 is provided on the rear side of the zoom lens system 1 . A liquid crystal display monitor 3 is provided on the rear side of the main body 4 . An optical image of a subject to be photographed obtained by the zoom lens system 1 is formed on an image surface S. As shown in FIG.

[0333] The sol...

example 1

[0348] The zoom lens system of Example 1 corresponds to Figures 1A to 1C Example 1 shown in . Table 1 shows the lens data of the zoom lens system of Example 1. Table 2 shows the aspheric data. Table 3 shows the focal length, F-number, field of view, and variable axial distance data when the shooting distance is infinite.

[0349] Table 1

[0350]

[0351] Table 2

[0352] axial distance

wide angle limit

centre position

Telephoto limit

d4

14.046

6.681

1.372

d12

4.484

10.535

18.188

d14

4.089

2.746

2.061

f

5.95

10.05

17.34

F

2.87

3.77

5.17

2ω

63.39

39.55

23.26

[0353] table 3

[0354] the surface

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Abstract

An object of the present invention is to provide: a zoom lens system having a short entire length during shooting and non-shooting and a high resolution; an imaging device using the zoom lens system; and a camera including the imaging device. The zoom lens system is used for forming an optical image of an object with a variable magnification, and, in order from the object side, comprises a first lens unit (G1) of negative optical power, a second lens unit (G2) of positive optical power and a third lens unit (G3) of positive optical power. The lens units move respectively along the optical axis so that a magnification is changed with changing a distance between the respective lens units. The second lens unit (G2) comprises at least three lens elements including an object side lens element of the second lens unit which is a positive lens element arranged on the most object side with the surface of strong curvature facing the object side, and an image side lens element of the second lensunit which is a positive lens element arranged on the most image side with the convex surface facing the object side.

Description

[0001] This application is a divisional application of the following application: [0002] Filing date of original application: June 27, 2005 [0003] The application number of the original application: 200580021884.8 [0004] Title of invention of the original application: zoom lens system, imaging device and photographing device technical field [0005] The present invention relates to a zoom lens system, in particular to a zoom lens system with stable performance, high image quality and small size for digital cameras, digital video cameras and other equipment. Background technique [0006] In digital cameras employing solid-state image sensors such as CCD (Charge Coupled Device) and CMOS (Complementary Metal-Oxide Semiconductor), components such as an optical low-pass filter should be provided at the rearmost part of the lens element in conjunction with the solid-state image sensor Between, a lens system with a relatively long back focus is necessary. In addition, in t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B15/20
CPCG02B15/177G02B15/143507
Inventor 吉次庆记
Owner PANASONIC CORP
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