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Image-forming lens, and camera device and portable information terminal device with the image-forming lens

An imaging lens and lens technology, which can be used in cameras, camera bodies, instruments, etc., to solve problems such as difficulty in aberration correction

Active Publication Date: 2015-02-11
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0014] On the other hand, in order to miniaturize the size of the imaging device, when the imaging lens is closer to the large-sized image plane, the angle of view of the incident light flux reaching the image plane increases, and correction of aberrations may become difficult

Method used

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  • Image-forming lens, and camera device and portable information terminal device with the image-forming lens
  • Image-forming lens, and camera device and portable information terminal device with the image-forming lens
  • Image-forming lens, and camera device and portable information terminal device with the image-forming lens

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0205] The lens composition of Example 1 is as attached figure 1 Shown.

[0206] In Example 1, F=18.3 mm and Fno=2.51.

[0207] The data in Example 1 is described in Table 1.

[0208] [Table 1]

[0209] Surface number R D Nd υd 1 24.64 1.0 1.6180 63.3 2 10.09 6.9 3 -17.14 0.8 1.4970 81.5 4 -50.86 0.1 5 34.34 3.9 1.8830 40.8 6 -17.25 0.7 1.9229 20.9 7 -37.26 2.1 8 INF D1 9 21.98 3.6 1.8830 40.8

[0210] 10 -16.24 0.8 1.5814 40.9 11 29.01 4.7 12 -13.81 0.7 1.9229 20.9 13 -812.55 2.7 1.8830 40.8 14 -20.84 0.4 15 -259.69 2.7 1.8640 40.6 16* -31.30 D2 17 INF 2.5 1.5168 64.2 18 INF -

[0211] In Table 1, "INF" means "∞ (infinity)", and "surface number with *" means "aspherical surface". Each of "D1" and "D2" respectively represents an extension amount of each of the first lens group and the second lens group as focusing is performed. The same applies to these marks in the foll...

Embodiment 2

[0240] The lens structure in Example 2 is as attached image 3 Shown.

[0241] In Example 2, F=18.3mm and Fno=2.51.

[0242] The data in Example 2 are described in Table 3.

[0243] [table 3]

[0244] Surface number R D Nd υd 1 19.90 1.2 1.5891 61.2 2* 9.52 4.8 3 -20.20 0.8 1.4970 81.5 4 INF 0.1 5 24.32 3.2 1.8830 40.8 6 -19.09 0.8 1.8081 22.8 7 -76.21 2.2 8 INF D1 9 20.39 4.3 1.8830 40.8 10 -14.29 0.8 1.5955 39.2 11 29.00 3.4 12 -13.24 0.8 1.8081 22.8

[0245] 13 46.53 3.6 1.8830 40.8 14 -23.60 0.1 15 -144.22 2.1 1.8540 40.4 16* -26.90 D2 17 INF 2.5 1.5168 64.2 18 INF -

[0246] "Aspheric Surface"

[0247] The aspheric surface data of the second surface is as follows.

[0248] k=-0.583

[0249] C4=7.816E-05

[0250] C6=7.063E-07

[0251] C8=1.411E-08

[0252] C10=-2.787E-10

[0253] C12=4.589E-12

[0254] The aspheric surface data of the 16th surface is as follows.

[0255] k=0.000...

Embodiment 3

[0276] The lens structure in Example 3 is as attached Figure 5 Shown.

[0277] In Example 3, F=18.3mm and Fno=2.56.

[0278] The data in Example 3 are described in Table 5.

[0279] [table 5]

[0280] Surface number R D Nd υd 1* 30.65 1.2 1.5163 64.1 2* 9.52 6.7 3 INF 1.0 1.7400 28.3 4 41.99 0.7 5 18.53 2.5 1.8348 42.7 6 -721.82 2.2 7 INF D1 8 22.29 3.9 1.8348 42.7 9 -12.82 1.0 1.6034 38.0 10 31.75 3.3 11 -11.50 0.9 1.8081 22.8 12 1396.54 2.5 1.8348 42.7 13 -17.07 0.1 14 -120.59 2.2 1.8014 45.4

[0281] 15* -25.01 D2 16 INF 2.5 1.5168 64.2 17 INF -

[0282] "Aspheric Surface"

[0283] The aspheric surface data of the first surface is as follows.

[0284] k=0.00

[0285] C4=6.848E-05

[0286] C6=-1.392E-06

[0287] C8=1.123E-08

[0288] C10=-4.372E-11

[0289] C12=6.571E-14

[0290] The aspheric surface data of the second surface is as follows.

[0291] k=-0.118

[0292] C4=7.334E-05

[029...

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PUM

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Abstract

An image forming lens includes: from an object side to an image side in order, a first group with a positive refractive power which includes less than or equal to five lens elements of two negative lenses and equal to or more than one positive lens and in which a first lens element on a most object side is a negative meniscus lens a convex surface of which faces the object side; an aperture; and a second group with a positive refractive power which includes less than or equal to five lens elements including at least one cemented lens of a positive lens and a negative lens; wherein each of the first group and the second group shifts independently to perform focusing to a limited object distance, and an interval between the first lens element and a second lens element close to a surface on the image side of the first lens element: d1 1-2 and an interval between the second lens element and a third lens element close to a surface on the image side of the second lens element: d1 2-3 satisfy Conditional Expression A: 0.0 < d1 2-3 / d1 1-2 < 1.0.

Description

technical field [0001] The present invention relates to an imaging lens used in photographic equipment, such as silver halide cameras, digital cameras, video cameras, surveillance cameras and the like. The invention also relates to a portable information terminal device having the imaging lens. Background technique [0002] In recent years, digital still cameras and digital video cameras have been widely used as imaging devices using image sensors such as CCDs, CMOSs, and the like. In particular, as such imaging devices, digital still cameras have widely replaced silver halide cameras. [0003] As the number of pixels of an image sensor used in such an imaging device gradually increases, an imaging lens serving as an imaging lens requires higher optical performance. In addition, in consideration of the portability of imaging devices, miniaturization also needs to be improved, and in the market of imaging devices, high performance and miniaturization have become mainstream. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G02B13/18G02B7/02G03B17/12G03B30/00
CPCG02B13/009G02B13/0045G02B13/04G02B9/64G02B13/0015
Inventor 窪田高士大桥和泰
Owner RICOH KK