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Zoom lens system

A magnifying glass and lens technology, applied in the field of magnifying glass system, can solve the problems of miniaturization of sacrificial lens system

Inactive Publication Date: 2007-11-14
HOYA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the other hand, it sacrifices the miniaturization of the lens system

Method used

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  • Zoom lens system
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  • Zoom lens system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0104] FIG. 1 is a lens arrangement of a magnifying glass system according to a first embodiment of the present invention.

[0105] Figures 2A-2D show the distortion at the short focus distance limit with the lens setup shown in Figure 1.

[0106] Figures 3A-3D show the resulting distortion at intermediate focusing distances with the lens setup shown in Figure 1 .

[0107] Figures 4A-4D show the resulting distortion at the extreme long focus distance with the lens setup shown in Figure 1 .

[0108] Table 1 shows the numerical values ​​of the first embodiment.

[0109] The negative first lens group 10 sequentially includes a negative meniscus lens having a convex surface facing the target, a biconcave negative lens assembly, and a biconcave positive lens assembly sequentially from the object.

[0110] The positive second lens group 20 sequentially includes a biconcave positive lens assembly, a composite lens assembly having a biconcave positive lens assembly and a biconcave neg...

Embodiment 2

[0133] Fig. 5 is a lens arrangement of a magnifying glass system according to a second embodiment of the present invention.

[0134] Figures 6A-6D show the resulting distortion at the short focal length limit with the lens setup shown in Figure 5 .

[0135] Figures 7A-7D show the resulting distortion at intermediate focal lengths with the lens setup shown in Figure 5 .

[0136] 8A-8D show the distortion phenomenon at the long focal length limit according to the lens setup shown in FIG. 5 .

[0137] Table 2 shows the values ​​for the second example.

[0138] The basic arrangement of the lens of the second embodiment is the same as that of the first embodiment.

[0139] The aperture S is set at 0.6 in front (on the object side) of the second lens group 20 (7th surface).

[0140] [Table 2]

[0141] FNO.=1:2.0-2.8-4.3

[0142] f=8.00-13.50-23.59

[0143] W=31.5-19.3-11.2

[0144] surface number.

r

d

Nd

v

[0145] 1 ...

Embodiment 3

[0160] FIG. 9 is a lens arrangement of a magnifying glass system according to a third embodiment of the present invention.

[0161] 10A-10D show the distortion at the short focal length limit with the lens setup shown in FIG. 9 .

[0162] Figures 11A-11D show the resulting distortion at intermediate focal lengths with the lens setup shown in Figure 9 .

[0163] Figures 12A-12D show the distortion at the long focal length extreme with the lens setup shown in Figure 9 .

[0164] Table 3 shows the numerical values ​​of the third example.

[0165] The basic arrangement of the lenses of the third embodiment is the same as that of the first embodiment.

[0166] The aperture S is set 0.4 in front (on the object side) of the second lens group 20 (7th surface).

[0167] [table 3]

[0168] FNO.=1:2.0-2.7-4.0

[0169] f=8.00-13.50-23.60

[0170] W=31.7-19.4-11

[0171] surface number

r

d

Nd

v

1

2

3

4

5 *

...

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Abstract

A zoom lens system includes negative first lens group, a positive second lens group and a positive third lens group, in this order from the object. Upon zooming from the short focal length extremity to the long focal length extremity, all of the negative first lens group, the positive second lens group and the positive third lens groups are arranged to move in the optical axis direction. The negative first lens group includes a negative lens element, a negative lens element and a positive lens element, in this order from the object. The positive second lens group includes a positive lens element, a positive lens element, a negative lens element, and a positive lens element, in this order from the object. The zoom lens system satisfies the following condition: 1.2<|f1G| / f2G<1.5 (1) wherein f1G designates the focal length of the negative first lens group (f1G <0 ); and f2G designates the focal length of the positive second lens group.

Description

technical field [0001] The present invention relates to a magnifying glass system that has a magnification ratio of about 3 times, covers a wide-angle to a telephoto range, and is used for a digital camera having an image device such as a CCD or CMOS. Background technique [0002] In recent years, there has been further demand for higher-quality magnifying glass systems in response to higher pixels in imagers, and in response to pixel miniaturization, there has also been demand for faster lens systems with smaller F-numbers . In reality, however, the dominant products on the market are magnifier systems with F-numbers of 2.8 to 3.5 at the extreme short focusing distances. [0003] Correcting for various aberrations such as spherical aberration in particular becomes very difficult when trying to achieve a fast lens system with an F-number of about 2 at the extreme short focusing distance in a typical compact camera magnifier. difficulty. [0004] It is of course possible t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/00G02B15/14G02B13/24
CPCG02B15/177G02B15/143507G02B3/0062G02B3/0087G02B13/009
Inventor 榎本隆
Owner HOYA CORP
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