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Internal focusing type imaging lens

An imaging lens, internal focus technology, applied in optical components, optics, instruments, etc., to achieve the effect of reducing weight, improving edge spherical aberration, and suppressing total length

Pending Publication Date: 2020-07-31
深圳市雷影光电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, since the average user is an ordinary photographer, high cost performance is also sought
It is precisely because of the above points that there are many constraints in the design of the mirrorless single lens

Method used

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  • Internal focusing type imaging lens
  • Internal focusing type imaging lens
  • Internal focusing type imaging lens

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0077] figure 1 Shown is the structural schematic diagram of the imaging lens of Embodiment 1, and the numerical data of the imaging lens are shown in Table 1 and Table 2:

[0078] Table 1

[0079]

[0080]

[0081] Table 2

[0082]

[0083] Wherein, the surface number represents the surface number of each lens from the object side to the image side;

[0084] Figure 2-4 Showing the spherical aberration, curvature of field, and distortion curves of embodiment 1 at infinity focus, Figure 5-7 The spherical aberration, curvature of field, and distortion curves of Example 1 at the shortest focusing distance are shown.

[0085] The spherical aberration curve graph shows the spherical aberration curve when the aperture number is 1.4, among which, the F line, D line, and C line represent the spherical aberration at the wavelength of 486nm, the wavelength of 587nm, and the wavelength of 656nm respectively, and the abscissa indicates the spherical aberration The magnitud...

Embodiment 2

[0087] Such as Figure 8 As shown, the difference between this embodiment and Embodiment 1 lies in that the lens parameters of the imaging lens are different. Hereinafter, Table 3 and Table 4 show various numerical data about the imaging lens of this embodiment.

[0088] table 3

[0089]

[0090]

[0091] Table 4

[0092]

[0093] Figure 9-11 Showing the spherical aberration, curvature of field, and distortion curves of Example 2 at infinity focus, Figure 12-14 The spherical aberration, curvature of field, and distortion curves of Example 2 at the shortest distance are shown. It can be seen from Figures 9-14 that the imaging lens of this embodiment has a good imaging effect.

Embodiment 3

[0095] Such as Figure 15 As shown, the difference between this embodiment and Embodiment 1 lies in that the lens parameters of the imaging lens are different. Hereinafter, Table 5 and Table 6 show various numerical data about the imaging lens of this embodiment.

[0096] table 5

[0097]

[0098]

[0099] Table 6

[0100]

[0101] Figure 16-18 Showing the spherical aberration, curvature of field, and distortion curves of Example 3 at infinity focus, Figure 19-21 The spherical aberration, curvature of field, and distortion curves of Example 3 at the shortest focusing distance are shown. It can be seen from Figures 16-21 that the imaging lens of this embodiment has a good imaging effect.

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Abstract

The invention provides an internal focusing type imaging lens which sequentially comprises a first lens group with positive focal power, a second lens group with positive focal power, a third lens group with negative focal power and a fourth lens group with positive focal power from an object side to an image side. In the focusing process, the third lens group moves towards the image side along the optical axis; the first lens group comprises a first lens with negative focal power, a second lens with positive focal power, a third lens with positive focal power and a fourth lens with negative focal power; the second lens group comprises a fifth lens, a sixth lens and a seventh lens, and the fifth lens and the sixth lens are combined to form a cemented lens group; the third lens group comprises an eighth lens; the fourth lens group comprises a ninth lens and a tenth lens. The focusing assembly of the imaging lens is composed of only one lens so that the weight of the focusing assembly and the total weight of the imaging lens are reduced, and quick focusing of the imaging lens and the imaging equipment can be facilitated.

Description

technical field [0001] The present invention relates to the technical field of optical imaging, in particular to an inner focusing imaging lens. Background technique [0002] In the photography market in recent years, mirrorless cameras are expanding rapidly. Compared with SLR cameras, which are large in size and poor in portability, mirrorless cameras are small in size and light in weight and excellent in portability due to the cancellation of the reflector assembly. Thanks to the mature technology of high-precision CCD, the mirrorless camera also has a good high-quality imaging quality. At the same time, domestic photography enthusiasts are increasing day by day, with a wide range of application scenarios. In daily travel applications, more consideration is given to lenses that are lightweight, have both wide-angle viewing angles and strong close-up capabilities. [0003] Mirrorless camera lenses are the same as SLR camera lenses, users expect them to have high performanc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B13/00G02B15/14G02B13/18
CPCG02B15/14G02B13/0015G02B13/005G02B13/006
Inventor 刘瑞军陈宝锋
Owner 深圳市雷影光电科技有限公司
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