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Zoom lens and imaging apparatus

A zoom lens, image-side technology, applied in instruments, optics, diffraction gratings, etc., can solve the problems of larger off-axis aberration, larger magnification chromatic aberration, etc., and achieve the effect of large image circle and good optical performance

Pending Publication Date: 2020-10-09
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The image circles of the lens systems described in Patent Document 1 and Patent Document 2 are small. If the ratio of these lens systems is enlarged to cope with the size of the image circle required in recent years, the off-axis aberration will also change with the enlargement of the lens system. Large, especially the chromatic aberration of magnification becomes larger

Method used

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  • Zoom lens and imaging apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0098] The structure of the zoom lens of embodiment 1 and the moving track are shown in figure 1 , and its illustration method and structure are as described above, so a part of repeated description is omitted here. The zoom lens of Embodiment 1 includes a first lens group G1 having positive refractive power, a second lens group G2 having negative refractive power, a third lens group G3 having positive refractive power, and a fourth lens group G3 having positive refractive power in order from the object side to the image side. Lens group G4 and a fifth lens group G5 with positive refractive power. When zooming, the first lens group G1 and the fifth lens group G5 are fixed relative to the image plane Sim, and the second lens group G2, the third lens group G3, and the fourth lens group G4 change the distance between adjacent lens groups. Move along the optical axis Z at intervals. The first lens group G1 includes a 1a lens group G1a having a negative refractive power, a 1b len...

Embodiment 2

[0127] The structure and moving track of the zoom lens of embodiment 2 are shown in Figure 4 . The zoom lens of Example 2 has the same configuration as that of the zoom lens of Example 1 in outline. Regarding the zoom lens of Example 2, the basic lens data are shown in Table 4A and Table 4B, the specifications and variable surface spacing are shown in Table 5, the aspheric coefficients are shown in Table 6, and the various aberration diagrams are shown in Figure 5 .

[0128] [Table 4A]

[0129] Example 2

[0130] sn R D Nd νd θgF *1 171.58622 2.900 1.77250 49.60 0.55212 2 48.60432 26.868 3 -92.24749 2.399 1.55032 75.50 0.54001 4 794.16247 0.539 5 88.58331 4.900 1.53996 59.46 0.54418 6 142.91667 2.952 7 140.06699 13.625 1.43700 95.10 0.53364 8 -129.48065 0.125 9 155.09605 2.399 1.84666 23.78 0.61923 10 99.11860 13.898 11 62.26591 13.052 1.43700 ...

Embodiment 3

[0142] The structure and moving track of the zoom lens of embodiment 3 are shown in Figure 6 . The zoom lens of Example 3 has the same configuration as that of the zoom lens of Example 1 in outline. Regarding the zoom lens of Example 3, the basic lens data are shown in Table 7A and Table 7B, the specifications and variable surface spacing are shown in Table 8, the aspheric coefficients are shown in Table 9, and the aberration diagrams are shown in Figure 7 .

[0143] [Table 7A]

[0144] Example 3

[0145] sn R D Nd νd θgF *1 191.78045 2.900 1.77250 49.60 0.55212 2 49.74501 26.241 3 -92.58733 2.400 1.61800 63.33 0.54414 4 -1130.51571 0.528 5 106.37599 4.460 1.56732 42.84 0.57814 6 179.15187 2.842 7 163.36873 12.490 1.43700 95.10 0.53364 8 -137.01357 0.130 9 173.88007 2.460 1.84666 23.78 0.61923 10 111.63652 14.847 11 62.88399 13.780 1.43700 95....

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Abstract

The invention provides a zoom lens having a large image ring and good optical performance, and an imaging apparatus including the zoom lens. The zoom lens consists of, in order from an object side, apositive first lens group, a negative second lens group, a third lens group, a positive fourth lens group, and a positive fifth lens group. During zooming, the second lens group, the third lens group,and the fourth lens group move. The second lens group has a negative lens and a cemented lens successively in order from a most object side to an image side. The cemented lens of the second lens group has a first negative lens and a first positive lens successively in order from an object side to an image side. A predetermined conditional expression for the first positive lens is satisfied.

Description

technical field [0001] The invention relates to a zoom lens and an imaging device. Background technique [0002] Conventionally, a lens system having a five-group structure is known as a zoom lens used in broadcast video cameras, movie cameras, digital cameras, and the like. For example, the following Patent Document 1 and Patent Document 2 describe a zoom lens that includes a first lens group with positive refractive power, a second lens group, and a third lens group with positive refractive power in order from the object side to the image side. , The 4th lens group and the 5th lens group with positive refractive power, the 2nd lens group, the 3rd lens group and the 4th lens group move when zooming. [0003] Patent Document 1: Japanese Patent Laid-Open No. 2017-181719 [0004] Patent Document 2: Japanese Patent Laid-Open No. 2017-078770 [0005] In recent years, cameras having larger sensor sizes than conventional ones have been used in pursuit of high image quality, and...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B15/167G02B15/20
CPCG02B15/167G02B15/20G02B15/1451G02B15/145125G02B15/145129G02B27/005G02B27/0025
Inventor 田中琢也
Owner FUJIFILM CORP
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