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Imaging lens and imaging apparatus

An imaging lens and lens technology, applied in optical components, instruments, optics, etc., can solve problems such as insufficient correction of distortion aberration, insufficient correction of distortion aberration and chromatic aberration of magnification, and achieve good performance and miniaturization

Active Publication Date: 2019-12-31
FUJIFILM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Correction of distortion aberration of the lens system described in Patent Document 1 is insufficient
Correction of distortion aberration and lateral chromatic aberration of the lens system described in Patent Document 2 is insufficient

Method used

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  • Imaging lens and imaging apparatus
  • Imaging lens and imaging apparatus
  • Imaging lens and imaging apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0085] A cross-sectional view showing the structure of the imaging lens of Example 1 is at figure 1 It is shown in , and its illustration method and structure are as above, so a part of repeated description is omitted here. The imaging lens of Example 1 is sequentially composed of a first lens group G1 with positive refractive power, an aperture stop St, a second lens group G2 with positive refractive power, and a third lens group G3 with negative refractive power from the object side toward the image side. When focusing from an object at infinity to the closest object, only the second lens group G2 moves toward the object side along the optical axis Z. The above is the outline of the imaging lens of Embodiment 1.

[0086] The first lens group G1 is composed of six lenses of lenses L11 to L16 sequentially from the object side to the image side, the second lens group G2 is composed of three lenses of lenses L21 to L23 in sequence from the object side to the image side, and the...

Embodiment 2

[0110] A sectional view showing the structure of the imaging lens of Example 2 is shown in figure 2 middle. The imaging lens of Example 2 has the same structure as that of the imaging lens of Example 1 in outline. The first lens group G1 is composed of six lenses of lenses L11 to L16 sequentially from the object side to the image side, the second lens group G2 is composed of three lenses of lenses L21 to L23 in sequence from the object side to the image side, and the third lens group G3 is composed of two lenses of lenses L31 to L32 sequentially from the object side toward the image side. The basic lens data of the imaging lens of Example 2 are shown in Table 4, the various factors are shown in Table 5, the aspheric coefficients are shown in Table 6, and the various aberrations in the state of focusing on an object at infinity are illustrated. At Figure 7 middle.

[0111] [Table 4]

[0112] Example 2

[0113] sn R D Nd vd θgF 1 46.21544 2.400 1...

Embodiment 3

[0121] A sectional view showing the structure of the imaging lens of Example 3 is shown in image 3 middle. The imaging lens of Example 3 has the same structure as that of the imaging lens of Example 1 in outline. The first lens group G1 is composed of 6 lenses of lenses L11 to L16 in sequence from the object side to the image side, the second lens group G2 is composed of 3 lenses of lenses L21 to L23 in sequence from the object side to the image side, and the third lens group The group G3 is composed of three lenses of lenses L31 to L33 in order from the object side toward the image side. The basic lens data of the imaging lens of Example 3 are shown in Table 7, the various factors are shown in Table 8, the aspheric coefficients are shown in Table 9, and the various aberration diagrams of the state of focusing on an object at infinity shown in Figure 8 middle.

[0122] [Table 7]

[0123] Example 3

[0124] sn R D Nd vd θgF 1 90.84269 2.400 1.60...

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Abstract

The present invention provides an imaging lens capable of achieving miniaturization and fully correcting distortion aberration and chromatic difference of magnification to have a good performance anda camera device having the same. The imaging lens consists of, in order from the object side, a positive first lens group (G1), a stop, a positive second lens group (G2), and a negative third lens group (G3). Lenses arranged first and second from the object side are both negative single lenses having convex surfaces toward the object side. The second lens group (G2) includes a cemented lens in which a negative lens and a positive lens are cemented. During focusing, only the second lens group moves. Assuming that focal lengths of the first lens group (G1) and the second lens group (G2) are f1 and f2, respectively, the imaging lens satisfies 0.7<f1 / f2<2.

Description

technical field [0001] The invention relates to an imaging lens and an imaging device. Background technique [0002] Conventionally, as an imaging lens applicable to an imaging device such as a digital camera, for example, a lens system having a three-group structure as described in Patent Document 1, Patent Document 2, and Patent Document 3 described below is known. In the following Patent Document 1, Patent Document 2, and Patent Document 3, lens systems of an inner focusing method are described. [0003] Patent Document 1: Japanese Patent Laid-Open No. 2014-142604 [0004] Patent Document 2: Japanese Patent Laid-Open No. 2013-125213 [0005] Patent Document 3: Japanese Patent Laid-Open No. 2013-029658 [0006] In recent years, along with miniaturization of imaging devices, miniaturization of imaging lenses mounted on imaging devices has also been demanded. In addition, along with miniaturization, higher performance is required, and the level of the requirement is incr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B15/177
CPCG02B15/177G02B13/0045G02B9/64
Inventor 宫城岛峻介
Owner FUJIFILM CORP
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