CN220171328U - Wide-angle imaging lens with internal focusing function - Google Patents
Wide-angle imaging lens with internal focusing function Download PDFInfo
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- CN220171328U CN220171328U CN202321445375.XU CN202321445375U CN220171328U CN 220171328 U CN220171328 U CN 220171328U CN 202321445375 U CN202321445375 U CN 202321445375U CN 220171328 U CN220171328 U CN 220171328U
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Abstract
The utility model discloses an internal focusing wide-angle imaging lens, which comprises a first lens group GR 1 The first negative lenses G are arranged in order from the visual direction 1 Second double cemented lens G 2 Third doublet lens G 3 Fourth negative lens G 4 Fifth positive lens G 5 Sixth doublet lens G 6 Seventh double-cemented lens G 7 The first lens group GR 1 The combined focal length of (2) satisfies the following conditional expression: 60<F 1 <200; wherein F is 1 Representing the first lens group GR 1 Is provided for the focal length of the lens. The whole device can fully reduce various aberrations, so that the whole field of view can be excellently imaged, the focusing lens is light, and the breathing effect is effectively restrained.
Description
Technical Field
The utility model belongs to the technical field of glass processing equipment, and particularly relates to an internal focusing wide-angle imaging lens.
Background
There are mirror single-lens cameras and single-lens reflex cameras as to the presence or absence of a lens-interchangeable camera. In the mirror-less single lens camera, there is no bounce mirror as in the single lens reflex camera. Therefore, the mirror-less single lens camera can form a compact camera compared with a single lens reflex camera.
The existing commonly used wide-angle lens is easy to generate various aberrations, so that the effects of full-view imaging and focusing lens weight reduction are limited, and respiratory effects exist, so that when a video shooting mode is used, the change of the angle of view is large, and the user experience is poor.
Disclosure of Invention
Aiming at the defects of the prior art, the utility model aims to provide an internal focusing wide-angle imaging lens, which solves the technical problems in the prior art.
The aim of the utility model can be achieved by the following technical scheme:
an internal focusing wide-angle imaging lens is arranged in order from an object side: first lens group GR having positive optical power 1 A diaphragm SP, a second lens group GR with positive focal power 2 Third lens group GR having positive optical power 3 The method comprises the steps of carrying out a first treatment on the surface of the Second lens group GR in focusing process from infinity to closest object distance 2 With the optical axis moving towards the object end, the first lens group GR 1 And a third lens group GR 3 Is fixed with respect to the image plane and,
the first lens group GR 1 The first negative lenses G are arranged in order from the visual direction 1 Second double cemented lens G 2 Third doublet lens G 3 Fourth negative lens G 4 Fifth positive lens G 5 Sixth doublet lens G 6 Seventh double-cemented lens G 7 The first lens group GR 1 The combined focal length of (2) satisfies the following conditional expression:
60<F 1 <200；
wherein F is 1 Representing the first lens group GR 1 Is provided for the focal length of the lens.
Further, the first lens group GR 1 The second double cemented lens G in (2) 2 Third doublet lens G 3 Is an achromatic lens group and is integrally formed.
Further, the second double cemented lens G 2 Third doublet lens G 3 The method meets the following conditions:
nd 2 >nd 3 ；
vd 2 <70<vd 3 ；
wherein nd 2 ，nd 3 Is a lens G 2 And G 3 Refractive index vd of (v) 2 ，vd 3 Is a lens G 2 And G 3 Abbe number of (c).
Further, the second lens group GR 2 Comprising a negative lens G 8 And positive lens G 9 And satisfies the following conditional expression:
20<F 2 <90；
vd 8 >90；
wherein F is 2 Representing the second lens group GR 2 Focal length vd 8 Is a negative lens G 8 Abbe number of glass.
Further, the third lens group GR 3 Comprises two lenses G respectively 10 And G 11 The following conditional expression is satisfied:
100<F 3 <500；
wherein F is 3 Representing the combined focal length of the third lens group.
Further, the distance between the lens surface closest to the image side and the image plane in the imaging lens is satisfied between 12 and 19.
The utility model has the beneficial effects that:
1. the device provides a wide-angle lens with a wide-angle large aperture, which can sufficiently reduce various aberrations, can realize excellent imaging of a full field of view, is light in weight, and can effectively inhibit respiratory effects.
2. The device also suppresses respiratory effect, so that when the video shooting mode is used, the change of the angle of view is extremely small, and the user experience is greatly improved.
3. The focusing lens group of the device only comprises two pieces of glass, and provides a design with excellent imaging and high portability.
Drawings
In order to more clearly illustrate the embodiments of the present utility model or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below.
Fig. 1 is a lens structure diagram illustrating an imaging lens according to an embodiment of the present utility model;
FIG. 2 is a color spherical aberration diagram illustrating an imaging lens at infinity focusing (INF) according to an embodiment of the present utility model;
fig. 3 is an astigmatic aberration diagram illustrating an imaging lens at infinity focusing (INF) according to an embodiment of the present utility model.
Detailed Description
The technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. All other embodiments, which can be made by those skilled in the art based on the embodiments of the utility model without making any inventive effort, are intended to be within the scope of the utility model.
As shown in fig. 1 to 3, an embodiment of the present utility model provides an internal-focusing wide-angle imaging lens, which is sequentially configured from an object side: first lens group GR having positive optical power 1 100. Diaphragm SP400, second lens group GR with positive focal power 2 200. Third lens group GR having positive optical power 3 300; second lens group GR in focusing process from infinity to closest object distance 2 200 moves toward the object end along with the optical axis, the first lens group GR 1 100 and third lens group GR 3 300 is fixed to the image plane, and the three lens groups arranged in accordance with the optical power are wide-angle lenses of large aperture, but can satisfactorily correct chromatic aberration and chromatic aberrationSpherical aberration and other various aberrations, and the focusing lens group is light and convenient, has shorter total length and brings great convenience for daily use.
First lens group GR 1 100 comprises 7 lenses, the first negative lenses G are arranged in order from the visual direction 1 1. Second double-cemented lens G 2 2. Third doublet lens G 3 3. Fourth negative lens G 4 4. Fifth positive lens G 5 5. Sixth doublet lens G 6 6. Seventh double-cemented lens G 7 7, wherein G 6 6、G 7 7 two lenses are glued, the first lens group GR 1 The combined focal length of 100 satisfies the following conditional expression:
60<F 1 <200； (1)
wherein F is 1 Representing the first lens group GR 1 100, combined focal length.
The matching is excellent in design, various aberrations of the matching are reduced to a good level, and the final aberration balance of the whole optical system is facilitated. When the conditional expression (1) is below the lower limit, although spherical aberration can be well corrected, chromatic aberration of magnification of the first lens group is difficult to be corrected, which is not an optimal solution. Therefore, the distance between the first lens groups cannot be reduced below the lower limit, and when the condition (1) is higher than the upper limit, the distance between the first lens groups is prolonged, the whole system structure is increased, and the miniaturization requirement is not facilitated. Therefore, the lens must satisfy the power distribution of the conditional expression (1)
First lens group GR 1 Second double cemented lens G in 100 2 2. Third doublet lens G 3 And 3 is an achromatic lens group and is integrally formed.
Further, a second double cemented lens G 2 2. Third doublet lens G 3 3 satisfies the following conditions:
nd 2 >nd 3 ；(2)
vd 2 <70<vd 3 ；(3)
wherein nd 2 ，nd 3 Is a lens G 2 2 and G 3 3 refractive index vd 2 ，vd 3 Is a lens G 2 2 and G 3 Abbe number of 3. Adhesive lens group configured according to conditions (2) and (3)G 6 6、G 7 And 7, the chromatic aberration of the lens group is quite large if the conditional expression (2) is not satisfied, and if the conditional expression (3) is not satisfied, the lens group cannot self-eliminate the chromatic aberration of the magnification and cannot balance the system aberration. Therefore, the ultra-wide angle imaging lens and the device excellent in imaging can be obtained only by satisfying the above conditional expressions (2), (3).
Further, a second lens group GR 2 200 includes a negative lens G 8 8 and positive lens G 9 9, and satisfies the following conditional expression:
20<F 2 <90；(4)
vd 8 >90；(5)
wherein F is 2 Representing the second lens group GR 2 200 focus, vd 8 Is a negative lens G 8 Abbe number of glass.
In general, a wide-angle lens tends to have a large angle of view and a large aperture, resulting in a relatively heavy structure. The utility model satisfying the conditions (4) and (5) comprises an ultra-low dispersion lens negative lens G 8 8, the device is used for correcting chromatic aberration, and in addition, when focusing objects with different distances, the focusing response is rapid and accurate. If the condition (4) is not satisfied, the focal power of the whole optical system is unbalanced, and if the condition (5) is not satisfied, the chromatic aberration of the focusing lens is relatively large, and the correction cannot be performed through other groups in the system, so that the aberration balance of the whole system cannot be achieved
Further, the third lens group GR 3 300 comprises two lenses G respectively 10 10 and G 11 11 satisfying the following conditional expression:
100<F 3 <500；(6)
wherein F is 3 Representing the combined focal length of the third lens group.
Third lens group GR 3 300 includes a positive lens G 10 10 and negative lens G 11 11, conditional expression (6) defines a third lens group GR 3 300 optical power range, if above the upper limit of conditional (6), the lens group spherical aberration is too large, resulting in the whole optical powerIf the spherical aberration of the system is not balanced and is lower than the lower limit of the condition (6), the focal length is too small, and the focal power of the whole system is not balanced. Therefore, the third lens group satisfying the conditional expression (6) can achieve a balance effect on aberrations generated by the first lens group and the second lens group.
Further, a distance (BF) between a lens surface closest to an image side and an image plane in the imaging lens is satisfied between 12 and 19,
i.e. 12< BF <19 (7)
In order to ensure excellent imaging quality and at the same time ensure the usability for the interchangeable-lens type mirror-less single-lens camera, the conditional expression (7) must be satisfied.
As described above, according to the present utility model, there are provided an ultra-wide angle imaging lens and an imaging apparatus which are small, lightweight, large-caliber, and have excellent imaging performance.
The imaging lens of the present utility model will be described in detail based on the drawings, and in the lens data, the refractive index and abbe number are values of d-line. In the optical lens related data, the unit of length is mm, and the unit thereof will be omitted.
In FIG. 2 g, d and C represent the spherical aberration of visible wavelengths at 436nm,587.6nm and 650 nm, respectively. In fig. 3, T, S represent the meridional field curvature and the sagittal field curvature at 587.6nm in visible light, respectively. The wide-angle lens can sufficiently reduce various aberrations, can achieve excellent imaging in the whole field of view, and can be lightweight and effectively suppress respiratory effects.
The symbols used in the tables and the following description are as follows:
"si" in table 1 represents a surface number; "Ri" is the radius of curvature; "di" is the on-axis surface distance between the i-th surface and the i+1th surface; "n d "is the refractive index; "vd" is Abbe number; "fno" is the F number; "ω" is the half field angle. With respect to the surface number, "ASP" means that the surface is aspherical, and in relation to the radius of curvature, "Infinicity" and "≡" indicating that the surface is planar. The "IMG" is denoted as the imaging plane.
TABLE 1
In table 2, the second lens group moves back and forth at different object distances due to the lens focusing, INF is an infinitely distant object distance, X20 is an object distance 446.375mm, and mod is a closest focusing object distance 205mm.14 and 18 are the spacing of the focus lens group and the front and rear lenses. The two intervals of different object distances can be changed to achieve the focusing clear effect.
Further, the refractive index and the Abbe number are those with respect to the d-line (wavelength 587.6 nm).
TABLE 2
Wherein, various numerical data of the optical system of the embodiment comprises
f＝23mm Fno＝1.4 2w＝65°
It should be noted that the specific parameters in the above table are merely illustrative, and the parameters of each lens are not limited to the values shown in the above numerical embodiments, and other values may be adopted, and similar technical effects may be achieved.
The foregoing has shown and described the basic principles, principal features and advantages of the utility model. It will be understood by those skilled in the art that the present utility model is not limited to the embodiments described above, and that the above embodiments and descriptions are merely illustrative of the principles of the present utility model, and various changes and modifications may be made without departing from the spirit and scope of the utility model, which is defined in the appended claims.
Claims (6)
1. An internal focusing wide-angle imaging lens is arranged in order from an object side: first lens with positive optical powerGroup GR 1 A diaphragm SP, a second lens group GR with positive focal power 2 Third lens group GR having positive optical power 3 The method comprises the steps of carrying out a first treatment on the surface of the Second lens group GR in focusing process from infinity to closest object distance 2 With the optical axis moving towards the object end, the first lens group GR 1 And a third lens group GR 3 Is fixed relative to an image plane, and is characterized in that:
the first lens group GR 1 The first negative lenses G are arranged in order from the visual direction 1 Second double cemented lens G 2 Third doublet lens G 3 Fourth negative lens G 4 Fifth positive lens G 5 Sixth doublet lens G 6 Seventh double-cemented lens G 7 The first lens group GR 1 The combined focal length of (2) satisfies the following conditional expression:
60<F 1 <200；
wherein F is 1 Representing the first lens group GR 1 Is provided for the focal length of the lens.
2. The in-focus wide-angle imaging lens as set forth in claim 1, wherein the first lens group GR 1 The second double cemented lens G in (2) 2 Third doublet lens G 3 Is an achromatic lens group and is integrally formed.
3. The in-focus wide-angle imaging lens as set forth in claim 2, wherein the second double cemented lens G 2 Third doublet lens G 3 The method meets the following conditions:
nd 2 >nd 3 ；
vd 2 <70<vd 3 ；
wherein nd 2 ，nd 3 Is a lens G 2 And G 3 Refractive index vd of (v) 2 ，vd 3 Is a lens G 2 And G 3 Abbe number of (c).
4. The in-focus wide-angle imaging lens as set forth in claim 1, wherein the second lens group GR 2 Comprising a negative lens G 8 And positive lens G 9 And satisfies the following conditional expression:
20<F 2 <90；
vd 8 >90；
wherein F is 2 Representing the second lens group GR 2 Focal length vd 8 Is a negative lens G 8 Abbe number of glass.
5. The in-focus wide-angle imaging lens as set forth in claim 1, wherein the third lens group GR 3 Comprises two lenses G respectively 10 And G 11 The following conditional expression is satisfied:
100<F 3 <500；
wherein F is 3 Represents the third lens group GR 3 And combining the focal lengths.
6. The in-focus wide-angle imaging lens according to claim 1, wherein a distance between a lens surface closest to an image side and an image plane in the imaging lens is satisfied to be between 12mm and 19 mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321445375.XU CN220171328U (en) | 2023-06-08 | 2023-06-08 | Wide-angle imaging lens with internal focusing function |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321445375.XU CN220171328U (en) | 2023-06-08 | 2023-06-08 | Wide-angle imaging lens with internal focusing function |
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| Publication Number | Publication Date |
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| CN220171328U true CN220171328U (en) | 2023-12-12 |
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| CN202321445375.XU Active CN220171328U (en) | 2023-06-08 | 2023-06-08 | Wide-angle imaging lens with internal focusing function |
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- 2023-06-08 CN CN202321445375.XU patent/CN220171328U/en active Active
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