CN107608057B - Image pickup lens group - Google Patents
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- CN107608057B CN107608057B CN201711084920.6A CN201711084920A CN107608057B CN 107608057 B CN107608057 B CN 107608057B CN 201711084920 A CN201711084920 A CN 201711084920A CN 107608057 B CN107608057 B CN 107608057B
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Abstract
An image capturing lens assembly, comprising, in order from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens and a fifth lens. The first lens has positive focal power, and the object side surface of the first lens is a convex surface; the second lens has positive optical power or negative optical power; the third lens has positive optical power or negative optical power; the fourth lens has positive focal power, and the image side surface of the fourth lens is a convex surface; the fifth lens has negative focal power; and the effective focal length f1 of the first lens and the effective focal length f of the image pickup lens group satisfy: 1.5< f1/f <2.1. According to the imaging lens group of the present application, the effects of large aperture, miniaturization, and high imaging quality can be achieved.
Description
Technical Field
The present application relates to an image pickup lens group, and more particularly, to an image pickup lens group including five lenses.
Background
As applications of image sensors such as photosensitive coupling elements (CCDs) or complementary metal oxide semiconductor elements (CMOS) are expanded to the infrared light range, they may have applications for infrared imaging, distance detection, infrared identification, etc.
The continuous development of portable electronic products also requires miniaturization of the imaging lens, but the existing miniaturized imaging lens is usually large in F number, small in light incoming amount and cannot be used. Therefore, the miniaturization of the camera lens is ensured, and the camera lens is provided with a large aperture at the same time, so that the infrared camera lens is ensured to be applied to the fields of detection, identification and the like.
Accordingly, the present application is directed to providing a large-aperture, miniaturized, high-imaging-quality imaging lens group.
Disclosure of Invention
The present application provides an imaging lens group, e.g., a large aperture imaging lens group, applicable to a portable electronic product, which at least solves or partially solves at least one of the above-mentioned drawbacks of the prior art.
In one aspect, the present application provides an imaging lens assembly, including, in order from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens and a fifth lens. The first lens can have positive focal power, and the object side surface of the first lens is a convex surface; the second lens may have positive or negative optical power; the third lens may have positive or negative optical power; the fourth lens element may have positive refractive power, and an image-side surface thereof may be convex; the fifth lens may have negative optical power; and the effective focal length f1 of the first lens and the effective focal length f of the image pickup lens group can satisfy: 1.5< f1/f <2.1.
In one embodiment, the effective focal length f of the image capturing lens group and the entrance pupil diameter EPD of the image capturing lens group may satisfy: f/EPD <1.5.
In one embodiment, the effective focal length f4 of the fourth lens and the effective focal length f of the image capturing lens group may satisfy: 1.4< f4/f <3.
In one embodiment, the radius of curvature R8 of the image side of the fourth lens element and the effective focal length f4 of the fourth lens element may satisfy-1 < R8/f4< -0.5.
In one embodiment, the center thickness CT1 of the first lens on the optical axis, the center thickness CT2 of the second lens on the optical axis, and the center thickness CT3 of the third lens on the optical axis may satisfy: 0.7< CT1/(CT2+CT3) <1.3.
In one embodiment, the air space T23 on the optical axis between the second lens and the third lens and the air space T45 on the optical axis between the fourth lens and the fifth lens may satisfy: T23/T45<0.3.
In one embodiment, the air interval T45 between the fourth lens and the fifth lens on the optical axis and the total optical length TTL of the image capturing lens group may satisfy: 0.1< T45/TTL <0.3.
In one embodiment, the effective half-caliber DT12 of the image side surface of the first lens and the effective half-caliber DT41 of the object side surface of the fourth lens can satisfy the following conditions: 0.7< DT12/DT41<1.2.
In one embodiment, the object side surface of the fifth lens may be convex.
In one embodiment, the fifth lens element has at least one inflection point on the object-side or image-side surface.
In one embodiment, the following may be satisfied: 0.8< |SAG51/CT5| <3, where SAG51 is the on-axis distance between the intersection of the fifth lens object side and the optical axis to the vertex of the effective radius of the fifth lens object side, and CT5 is the center thickness of the fifth lens on the optical axis.
In one embodiment, the total optical length TTL of the image capturing lens assembly and half of the diagonal length ImgH of the effective pixel area on the imaging surface of the image capturing lens assembly may satisfy: TTL/ImgH <1.7.
In another aspect, the present application provides an imaging lens assembly, including, in order from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens and a fifth lens. The first lens can have positive focal power, and the object side surface of the first lens is a convex surface; the second lens may have positive or negative optical power; the third lens may have positive or negative optical power; the fourth lens element may have positive refractive power, and an image-side surface thereof may be convex; the fifth lens may have negative optical power; and the effective half-caliber DT12 of the first lens image side and the effective half-caliber DT41 of the fourth lens object side can satisfy the following conditions: 0.7< DT12/DT41<1.2.
In still another aspect, the present application provides an imaging lens assembly, including, in order from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens and a fifth lens. The first lens can have positive focal power, and the object side surface of the first lens is a convex surface; the second lens may have positive or negative optical power; the third lens may have positive or negative optical power; the fourth lens element may have positive refractive power, and an image-side surface thereof may be convex; the fifth lens may have negative optical power; and an air space T23 on the optical axis between the second lens and the third lens and an air space T45 on the optical axis between the fourth lens and the fifth lens may satisfy: T23/T45<0.3.
The application adopts a plurality of (e.g. five) lenses, and the imaging lens group has at least one beneficial effects of large aperture, miniaturization, high imaging quality and the like by reasonably distributing the focal power, the surface type, the center thickness of each lens, the axial spacing between each lens and the like.
Drawings
Other features, objects and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments, taken in conjunction with the accompanying drawings. In the drawings:
fig. 1 shows a schematic configuration diagram of an image pickup lens group according to embodiment 1 of the present application;
fig. 2A to 2C show an on-axis chromatic aberration curve, an astigmatism curve, and a distortion curve, respectively, of the image pickup lens group of embodiment 1;
fig. 3 shows a schematic configuration diagram of an image pickup lens group according to embodiment 2 of the present application;
fig. 4A to 4C show an on-axis chromatic aberration curve, an astigmatism curve, and a distortion curve, respectively, of the image pickup lens group of embodiment 2;
fig. 5 shows a schematic configuration diagram of an image pickup lens group according to embodiment 3 of the present application;
fig. 6A to 6C show an on-axis chromatic aberration curve, an astigmatism curve, and a distortion curve, respectively, of the image pickup lens group of embodiment 3;
fig. 7 shows a schematic configuration diagram of an image pickup lens group according to embodiment 4 of the present application;
Fig. 8A to 8C show an on-axis chromatic aberration curve, an astigmatism curve, and a distortion curve, respectively, of the image pickup lens group of embodiment 4;
fig. 9 shows a schematic configuration diagram of an image pickup lens group according to embodiment 5 of the present application;
fig. 10A to 10C show an on-axis chromatic aberration curve, an astigmatism curve, and a distortion curve, respectively, of the image pickup lens group of embodiment 5;
fig. 11 shows a schematic configuration diagram of an image pickup lens group according to embodiment 6 of the present application;
fig. 12A to 12C show an on-axis chromatic aberration curve, an astigmatism curve, and a distortion curve, respectively, of the image pickup lens group of embodiment 6;
fig. 13 shows a schematic configuration diagram of an image pickup lens group according to embodiment 7 of the present application;
fig. 14A to 14C show an on-axis chromatic aberration curve, an astigmatism curve, and a distortion curve, respectively, of the image pickup lens group of embodiment 7;
fig. 15 shows a schematic configuration diagram of an image pickup lens group according to embodiment 8 of the present application; and
fig. 16A to 16C show an on-axis chromatic aberration curve, an astigmatism curve, and a distortion curve, respectively, of the image pickup lens group of embodiment 8.
Detailed Description
For a better understanding of the application, various aspects of the application will be described in more detail with reference to the accompanying drawings. It should be understood that the detailed description is merely illustrative of exemplary embodiments of the application and is not intended to limit the scope of the application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.
It should be noted that in the present specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the feature. Accordingly, a first lens discussed below may also be referred to as a second lens or a third lens without departing from the teachings of the present application.
In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for convenience of explanation. In particular, the spherical or aspherical shape shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The figures are merely examples and are not drawn to scale.
Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, then the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is referred to as the object side surface, and the surface of each lens closest to the imaging surface is referred to as the image side surface.
It will be further understood that the terms "comprises," "comprising," "includes," "including," "having," "containing," and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Furthermore, when a statement such as "at least one of the following" appears after a list of features that are listed, the entire listed feature is modified instead of modifying a separate element in the list. Furthermore, when describing embodiments of the application, use of "may" means "one or more embodiments of the application. Also, the term "exemplary" is intended to refer to an example or illustration.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
The features, principles, and other aspects of the present application are described in detail below.
The image pickup lens group according to the exemplary embodiment of the present application may include, for example, five lenses having optical power, that is, a first lens, a second lens, a third lens, a fourth lens, and a fifth lens. The five lenses are sequentially arranged from the object side to the image side along the optical axis.
In an exemplary embodiment, the first lens may have positive optical power, and its object-side surface may be convex; the second lens may have positive or negative optical power; the third lens may have positive or negative optical power; the fourth lens element may have positive refractive power, and an image-side surface thereof may be convex; the fifth lens has negative optical power.
In an exemplary embodiment, the object side surface of the fifth lens may be convex. By reasonably setting the surface shape of the fifth lens, the incidence angle of the chief ray can be reduced, and the distortion can be reduced.
In an exemplary embodiment, the fifth lens element has at least one inflection point on the object-side or image-side surface. By reasonably setting the surface shape of the fifth lens, the incidence angle of the chief ray can be reduced, and the distortion can be reduced.
In an exemplary embodiment, the photographing lens assembly of the present application may satisfy the conditional expression f/EPD < 1.5, where f is an effective focal length of the photographing lens assembly and EPD is an entrance pupil diameter of the photographing lens assembly. More specifically, f and EPD may further satisfy f/EPD.ltoreq.1.2. The smaller the f-number Fno of the imaging lens group (i.e., the total effective focal length f of the lens/the entrance pupil diameter EPD of the lens), the larger the clear aperture of the lens, the more the amount of light entering in the same unit time. The reduction of f-number FNO can effectively improve the brightness of an image plane, so that the lens can better meet shooting requirements when light rays are insufficient, such as overcast days, dusk and the like, and has the advantage of large aperture. The lens is configured to meet the condition that f/EPD is smaller than 1.5, so that the lens has the advantage of a larger aperture, the light flux of the system can be increased, and the illumination of an imaging surface is enhanced; at the same time, aberrations of the fringe field of view can also be reduced.
In an exemplary embodiment, the imaging lens group of the present application may satisfy the conditional expression 1.5< f1/f <2.1, where f1 is an effective focal length of the first lens and f is an effective focal length of the imaging lens group. More specifically, f1 and f may further satisfy 1.53.ltoreq.f1/f.ltoreq.2.04. Through the reasonable collocation of the focal power and the surface of each lens, the large caliber can be realized, the resolution power can be effectively improved, the total length of the lens can be shortened, and the miniaturization of the lens can be ensured.
In an exemplary embodiment, the imaging lens group of the present application may satisfy the conditional expression 1.4< f4/f <3, where f4 is an effective focal length of the fourth lens, and f is an effective focal length of the imaging lens group. More specifically, f4 and f may further satisfy 1.45.ltoreq.f4/f.ltoreq.2.69. Satisfying the condition 1.4< f4/f <3, the effect of high resolution can be realized.
In an exemplary embodiment, the image capturing lens assembly of the present application may satisfy the conditional expression-1 < R8/f4< -0.5, where R8 is a radius of curvature of the image side surface of the fourth lens element and f4 is an effective focal length of the fourth lens element. More specifically, R8 and f4 may further satisfy-0.79.ltoreq.R8/f4.ltoreq.0.53. Satisfies the condition of-1 < R8/f4< -0.5, and can realize the effect of high resolution.
In an exemplary embodiment, the imaging lens group of the present application may satisfy the conditional expression 0.7< ct1/(CT 2+ct 3) <1.3, where CT1 is the center thickness of the first lens on the optical axis, CT2 is the center thickness of the second lens on the optical axis, and CT3 is the center thickness of the third lens on the optical axis. More specifically, CT1, CT2 and CT3 may further satisfy 0.71.ltoreq.CT1/(CT2+CT3). Ltoreq.1.15. Satisfying the condition 0.7< CT1/(CT2+CT3) <1.3, the effect of high resolution and large aperture can be realized.
In an exemplary embodiment, the image pickup lens group of the present application may satisfy the conditional expression T23/T45<0.3, where T23 is an air space on the optical axis of the second lens and the third lens, and T45 is an air space on the optical axis of the fourth lens and the fifth lens. More specifically, T23 and T45 may further satisfy T23/T45.ltoreq.0.12. The conditional expression T23/T45 is less than 0.3, and the effect of high resolution and large aperture can be realized.
In an exemplary embodiment, the image capturing lens assembly of the present application may satisfy the conditional expression 0.1< T45/TTL <0.3, where T45 is an air space on the optical axis of the fourth lens and the fifth lens, and TTL is an optical total length of the image capturing lens assembly (i.e., a distance on the optical axis from a center of an object side surface of the first lens to an imaging surface of the image capturing lens assembly). More specifically, T45 and TTL can further satisfy 0.11.ltoreq.T45/TTL.ltoreq.0.21. The lens has compact structure and is ensured to be miniaturized when meeting the condition.
In an exemplary embodiment, the imaging lens group of the present application may satisfy the conditional expression 0.7< dt12/DT41<1.2, wherein DT12 is an effective half-caliber of the image side surface of the first lens element and DT41 is an effective half-caliber of the object side surface of the fourth lens element. More specifically, DT12 and DT41 may further satisfy 0.75.ltoreq.DT 12/DT 41.ltoreq.1.06. Satisfying the condition that the ratio of the DT12/DT41 is less than 0.7 and less than 1.2, the lens size can be effectively controlled, and the effect of miniaturization is realized.
In an exemplary embodiment, the image capturing lens assembly of the present application may satisfy the conditional expression 0.8< |sag51/CT5| <3, where SAG51 is an on-axis distance between an intersection point of the fifth lens object side and the optical axis and an effective radius vertex of the fifth lens object side, and CT5 is a center thickness of the fifth lens on the optical axis. More specifically, SAG51 and CT5 may further satisfy 0.9.ltoreq.SAG 51/CT 5.ltoreq.2.85. Satisfying the condition 0.8< |SAG51/CT5| <3, the chief ray incidence angle can be reduced, and distortion can be reduced.
In an exemplary embodiment, the imaging lens group of the present application may satisfy a conditional expression TTL/ImgH <1.7, where TTL is an optical total length of the imaging lens group and ImgH is half of a diagonal length of an effective pixel region on an imaging plane. More specifically, TTL and ImgH can further satisfy TTL/ImgH.ltoreq.1.69. The conditional TTL/ImgH is smaller than 1.7, the size of the system can be effectively compressed, and the miniaturization characteristic is realized.
In an exemplary embodiment, the photographing lens assembly may further include at least one diaphragm to improve an imaging quality of the lens. For example, a stop may be provided between the first lens and the second lens.
Optionally, the image pickup lens group may further include a filter for correcting color deviation and/or a protective glass for protecting a photosensitive element located on the imaging surface.
The image pickup lens group according to the above embodiment of the present application may employ a plurality of lenses, for example, five lenses as described above. By reasonably distributing the focal power, the surface shape, the center thickness of each lens, the axial spacing between each lens and the like of each lens, the volume of the lens can be effectively reduced, the sensitivity of the lens can be reduced, and the processability of the lens can be improved, so that the camera lens group is more beneficial to production and processing and is applicable to portable electronic products. Meanwhile, the imaging lens group configured as described above has advantageous effects such as miniaturization, large aperture, high imaging quality, and the like.
In an embodiment of the present application, at least one of the mirrors of each lens is an aspherical mirror. The aspherical lens is characterized in that: the curvature varies continuously from the center of the lens to the periphery of the lens. Unlike a spherical lens having a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has a better radius of curvature characteristic, and has advantages of improving distortion aberration and improving astigmatic aberration. By adopting the aspherical lens, aberration occurring at the time of imaging can be eliminated as much as possible, thereby improving imaging quality.
However, it will be appreciated by those skilled in the art that the number of lenses making up the imaging lens group can be varied to achieve the various results and advantages described in this specification without departing from the scope of the application as claimed. For example, although the description has been made by taking five lenses as an example in the embodiment, the image pickup lens group is not limited to include five lenses. The camera lens group may also include other numbers of lenses, if desired.
Specific examples of the image pickup lens group applicable to the above-described embodiments are further described below with reference to the drawings.
Example 1
An image pickup lens group according to embodiment 1 of the present application is described below with reference to fig. 1 to 2C. Fig. 1 shows a schematic configuration diagram of an image pickup lens group according to embodiment 1 of the present application.
As shown in fig. 1, an image pickup lens group according to an exemplary embodiment of the present application sequentially includes, along an optical axis from an object side to an image side: a first lens L1, a stop STO, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a filter L6, and an imaging surface S13.
The first lens L1 has an object side surface S1 and an image side surface S2. The second lens L2 has an object side surface S3 and an image side surface S4. The third lens L3 has an object side surface S5 and an image side surface S6. The fourth lens L4 has an object side surface S7 and an image side surface S8. The fifth lens L5 has an object side surface S9 and an image side surface S10. The filter L6 has an object side surface S11 and an image side surface S12. Light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging surface S13.
In this embodiment, the first lens L1 has positive optical power, and the object-side surface S1 thereof is convex; the second lens L2 has negative optical power; the third lens L3 has positive optical power; the fourth lens L4 has positive focal power, and an image side surface S8 thereof is a convex surface; the fifth lens element L5 has negative refractive power, and has a convex object-side surface S9 at a paraxial region thereof.
Table 1 shows the surface types, the radii of curvature, the thicknesses, the materials, and the cone coefficients of the respective lenses of the imaging lens group of example 1, wherein the units of the radii of curvature and the thicknesses are millimeters (mm).
TABLE 1
As can be seen from table 1, the object side surface and the image side surface of any one of the first lens L1 to the fifth lens L5 are aspherical. In the present embodiment, the surface shape x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:
wherein x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at the position with the height h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c=1/R (i.e., paraxial curvature c is the inverse of radius of curvature R in table 1 above); k is the conic coefficient (given in table 1); ai is the correction coefficient of the aspherical i-th order. Table 2 below shows the higher order coefficients A that can be used for each of the aspherical mirrors S1-S10 in example 1 4 、A 6 、A 8 、A 10 、A 12 、A 14 And A 16 。
TABLE 2
| Face number | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | 4.1860E-02 | -7.3245E-03 | -3.5395E-03 | 4.0124E-03 | -1.7627E-03 | 3.4081E-04 | -2.4256E-05 |
| S2 | 1.6848E-02 | -4.3432E-02 | 5.0142E-02 | -3.5679E-02 | 1.3956E-02 | -2.7202E-03 | 2.0466E-04 |
| S3 | 6.2159E-02 | -4.4731E-02 | 2.6702E-02 | -8.3917E-03 | 1.0862E-03 | 2.6415E-04 | -6.3830E-05 |
| S4 | 2.2763E-04 | 4.2950E-02 | -6.7217E-02 | 6.0234E-02 | -3.0481E-02 | 8.1943E-03 | -8.9013E-04 |
| S5 | 1.6530E-01 | -2.6580E-01 | 2.8627E-01 | -1.9965E-01 | 8.0576E-02 | -1.7247E-02 | 1.5205E-03 |
| S6 | 3.2404E-03 | 4.1959E-02 | -8.4475E-02 | 7.5735E-02 | -3.8314E-02 | 9.8739E-03 | -9.8112E-04 |
| S7 | -1.1837E-02 | 7.2769E-03 | -4.6603E-03 | 3.0704E-04 | 1.1508E-03 | -5.4677E-04 | 6.8805E-05 |
| S8 | -1.3616E-02 | 3.7751E-03 | 4.2820E-03 | -3.4087E-03 | 1.2878E-03 | -2.2901E-04 | 1.4820E-05 |
| S9 | -1.3434E-01 | 4.8193E-02 | -1.5165E-02 | 3.4929E-03 | -4.5633E-04 | 3.0126E-05 | -7.8634E-07 |
| S10 | -5.4358E-02 | 2.0760E-02 | -7.9740E-03 | 1.8553E-03 | -2.4451E-04 | 1.6681E-05 | -4.5421E-07 |
Table 3 gives the effective focal lengths f1 to f5 of the respective lenses in embodiment 1, the total effective focal length f of the imaging lens group, the total optical length TTL of the imaging lens group (i.e., the distance on the optical axis from the center of the object side surface S1 of the first lens L1 to the imaging surface S13), and half the diagonal length ImgH of the effective pixel region on the imaging surface S13 of the imaging lens group.
TABLE 3 Table 3
| ImgH(mm) | 4.06 | f4(mm) | 7.32 |
| f(mm) | 3.93 | f5(mm) | -6.70 |
| f1(mm) | 6.01 | TTL(mm) | 5.59 |
| f2(mm) | -10.29 | ||
| f3(mm) | 8.42 |
The imaging lens group in embodiment 1 satisfies:
f/epd=1.10, where f is the total effective focal length of the imaging lens group, EPD is the entrance pupil diameter of the imaging lens group;
f1/f=1.53, where f1 is the effective focal length of the first lens, and f is the effective focal length of the image capturing lens group;
f4/f=1.86, where f4 is the effective focal length of the fourth lens, and f is the effective focal length of the image capturing lens group;
r8/f4= -0.59, wherein R8 is the radius of curvature of the image-side surface of the fourth lens element, and f4 is the effective focal length of the fourth lens element;
CT 1/(CT 2+ CT 3) =1.14, where CT1 is the center thickness of the first lens on the optical axis, CT2 is the center thickness of the second lens on the optical axis, and CT3 is the center thickness of the third lens on the optical axis;
t23/t45=0.05, where T23 is an air space on the optical axis of the second lens and the third lens, and T45 is an air space on the optical axis of the fourth lens and the fifth lens;
t45/ttl=0.18, where T45 is an air space on the optical axis of the fourth lens element and the fifth lens element, and TTL is an optical total length of the image capturing lens assembly (i.e., a distance on the optical axis from a center of an object side surface of the first lens element to an imaging surface of the image capturing lens assembly);
DT12/DT41 = 1.00, wherein DT12 is the effective half-aperture of the first lens object-side surface and DT41 is the effective half-aperture of the fourth lens object-side surface;
SAG51/CT5 |=1.95, wherein SAG51 is an on-axis distance between an intersection point of the fifth lens object side surface and the optical axis and an effective radius vertex of the fifth lens object side surface, and CT5 is a center thickness of the fifth lens on the optical axis; and
TTL/imgh= 01.38, where TTL is the optical total length of the imaging lens group and ImgH is half the diagonal length of the effective pixel area on the imaging plane.
In addition, fig. 2A shows an on-axis chromatic aberration curve of the image-pickup lens group of embodiment 1, which indicates a convergent focus deviation after light rays of different wavelengths pass through the lens. Fig. 2B shows an astigmatism curve of the imaging lens group of embodiment 1, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 2C shows a distortion curve of the image pickup lens group of embodiment 1, which represents distortion magnitude values in the case of different angles of view. As can be seen from fig. 2A to 2C, the imaging lens group provided in embodiment 1 can achieve good imaging quality.
Example 2
An image pickup lens group according to embodiment 2 of the present application is described below with reference to fig. 3 to 4C.
In this embodiment and the following embodiments, descriptions of portions similar to embodiment 1 will be omitted for brevity. Fig. 3 shows a schematic configuration diagram of an image pickup lens group according to embodiment 2 of the present application.
As shown in fig. 3, the image pickup lens group according to the exemplary embodiment of the present application sequentially includes, from an object side to an image side along an optical axis: a first lens L1, a stop STO, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a filter L6, and an imaging surface S13.
The first lens L1 has an object side surface S1 and an image side surface S2. The second lens L2 has an object side surface S3 and an image side surface S4. The third lens L3 has an object side surface S5 and an image side surface S6. The fourth lens L4 has an object side surface S7 and an image side surface S8. The fifth lens L5 has an object side surface S9 and an image side surface S10. The filter L6 has an object side surface S11 and an image side surface S12. Light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging surface S13.
In this embodiment, the first lens L1 has positive optical power, and the object-side surface S1 thereof is convex; the second lens L2 has negative optical power; the third lens L3 has positive optical power; the fourth lens L4 has positive focal power, and an image side surface S8 thereof is a convex surface; the fifth lens element L5 has negative refractive power, and has a convex object-side surface S9 at a paraxial region thereof.
Table 4 shows the surface types, the radii of curvature, the thicknesses, the materials, and the cone coefficients of the respective lenses of the imaging lens group of example 2, in which the units of the radii of curvature and the thicknesses are millimeters (mm).
TABLE 4 Table 4
As can be seen from table 4, in embodiment 2, the object side surface and the image side surface of any one of the first lens L1 to the fifth lens L5 are aspherical surfaces. Table 5 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 2, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.
TABLE 5
| Face number | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | 1.7524E-02 | 1.2556E-02 | -1.3252E-02 | 6.2044E-03 | -1.5477E-03 | 1.9062E-04 | -9.1655E-06 |
| S2 | 1.3465E-02 | -2.3127E-02 | 2.0652E-02 | -1.0369E-02 | 2.7849E-03 | -3.8178E-04 | 2.0809E-05 |
| S3 | 3.2610E-02 | -6.8563E-03 | -3.7431E-03 | 5.5668E-03 | -2.5493E-03 | 5.5670E-04 | -4.6087E-05 |
| S4 | 1.5459E-02 | 3.3207E-02 | -4.5990E-02 | 3.1543E-02 | -1.1863E-02 | 2.3583E-03 | -1.8964E-04 |
| S5 | 9.2027E-02 | -1.2255E-01 | 1.0107E-01 | -5.5097E-02 | 1.7784E-02 | -3.0903E-03 | 2.2147E-04 |
| S6 | 5.6194E-03 | -9.7923E-03 | 9.4138E-03 | -7.7665E-03 | 3.0626E-03 | -6.1152E-04 | 4.8960E-05 |
| S7 | -8.7038E-03 | -6.3471E-04 | 2.5660E-03 | -2.4311E-03 | 9.9872E-04 | -2.3814E-04 | 2.2388E-05 |
| S8 | -3.3013E-02 | 4.4371E-02 | -4.0265E-02 | 2.0592E-02 | -5.7948E-03 | 8.2506E-04 | -4.5808E-05 |
| S9 | -9.9107E-02 | 3.0631E-02 | -1.0611E-02 | 2.2769E-03 | -2.5179E-04 | 1.3701E-05 | -2.9346E-07 |
| S10 | -9.3851E-02 | 3.6890E-02 | -9.7862E-03 | 1.4912E-03 | -1.2864E-04 | 5.8515E-06 | -1.0882E-07 |
Table 6 gives the effective focal lengths f1 to f5 of the respective lenses in embodiment 2, the total effective focal length f of the imaging lens group, the total optical length TTL of the imaging lens group (i.e., the distance on the optical axis from the center of the object side surface S1 of the first lens L1 to the imaging surface S13), and half the diagonal length ImgH of the effective pixel region on the imaging surface S13 of the imaging lens group.
TABLE 6
| ImgH(mm) | 4.05 | f4(mm) | 7.20 |
| f(mm) | 3.99 | f5(mm) | -16.60 |
| f1(mm) | 7.09 | TTL(mm) | 6.09 |
| f2(mm) | -23.14 | ||
| f3(mm) | 13.26 |
Fig. 4A shows an on-axis chromatic aberration curve of the image-pickup lens group of embodiment 2, which indicates a convergent focus deviation after light rays of different wavelengths pass through the lens. Fig. 4B shows an astigmatism curve of the imaging lens group of embodiment 2, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 4C shows a distortion curve of the image pickup lens group of embodiment 2, which represents distortion magnitude values in the case of different angles of view. As can be seen from fig. 4A to 4C, the imaging lens group provided in embodiment 2 can achieve good imaging quality.
Example 3
An image pickup lens group according to embodiment 3 of the present application is described below with reference to fig. 5 to 6C. Fig. 5 shows a schematic configuration diagram of an image pickup lens group according to embodiment 3 of the present application.
As shown in fig. 5, the image pickup lens group according to the exemplary embodiment of the present application sequentially includes, from an object side to an image side along an optical axis: a first lens L1, a stop STO, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a filter L6, and an imaging surface S13.
The first lens L1 has an object side surface S1 and an image side surface S2. The second lens L2 has an object side surface S3 and an image side surface S4. The third lens L3 has an object side surface S5 and an image side surface S6. The fourth lens L4 has an object side surface S7 and an image side surface S8. The fifth lens L5 has an object side surface S9 and an image side surface S10. The filter L6 has an object side surface S11 and an image side surface S12. Light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging surface S13.
In this embodiment, the first lens L1 has positive optical power, and the object-side surface S1 thereof is convex; the second lens L2 has negative optical power; the third lens L3 has positive optical power; the fourth lens L4 has positive focal power, and an image side surface S8 thereof is a convex surface; the fifth lens element L5 has negative refractive power, and has a convex object-side surface S9 at a paraxial region thereof.
Table 7 shows the surface types, the radii of curvature, the thicknesses, the materials, and the cone coefficients of the respective lenses of the imaging lens group of example 3, in which the units of the radii of curvature and the thicknesses are millimeters (mm).
TABLE 7
As can be seen from table 7, in embodiment 3, the object side surface and the image side surface of any one of the first lens L1 to the fifth lens L5 are aspherical surfaces. Table 8 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 3, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.
TABLE 8
| Face number | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | 3.2355E-02 | -1.1677E-02 | 4.5522E-03 | -1.5546E-03 | 2.6654E-04 | -2.0366E-05 | 5.0293E-07 |
| S2 | 1.1197E-02 | -5.6271E-03 | 5.4417E-03 | -3.7434E-03 | 1.0510E-03 | -1.3376E-04 | 6.4754E-06 |
| S3 | 2.6046E-02 | 1.4565E-02 | -1.8105E-02 | 1.1161E-02 | -3.8299E-03 | 6.9106E-04 | -5.0264E-05 |
| S4 | 2.4271E-03 | 1.7848E-02 | -2.2787E-02 | 1.5660E-02 | -5.6702E-03 | 1.0647E-03 | -8.0468E-05 |
| S5 | 5.6944E-02 | -5.5344E-02 | 3.0325E-02 | -1.1088E-02 | 2.3846E-03 | -2.6835E-04 | 1.2386E-05 |
| S6 | -5.4799E-03 | 4.4557E-03 | -8.3276E-03 | 4.0991E-03 | -1.0928E-03 | 1.4957E-04 | -7.9157E-06 |
| S7 | -6.3049E-03 | -4.0345E-03 | 8.3983E-04 | -6.7715E-06 | -1.8348E-04 | 4.1531E-05 | -2.2231E-06 |
| S8 | -7.2211E-03 | 9.6964E-04 | -8.0372E-05 | -4.1726E-05 | -5.2203E-06 | 4.3228E-07 | 4.0331E-07 |
| S9 | -1.0007E-01 | 2.0309E-02 | -4.0978E-03 | 9.5291E-04 | -1.4352E-04 | 1.1052E-05 | -3.3378E-07 |
| S10 | -5.1102E-02 | 1.6390E-02 | -3.8449E-03 | 5.2967E-04 | -4.0786E-05 | 1.6122E-06 | -2.5292E-08 |
Table 9 gives the effective focal lengths f1 to f5 of the respective lenses in embodiment 3, the total effective focal length f of the imaging lens group, the total optical length TTL of the imaging lens group, and half the diagonal length ImgH of the effective pixel region on the imaging surface S13 of the imaging lens group.
TABLE 9
Fig. 6A shows an on-axis chromatic aberration curve of the image-pickup lens group of embodiment 3, which indicates a convergent focus deviation after light rays of different wavelengths pass through the lens. Fig. 6B shows an astigmatism curve of the imaging lens group of embodiment 3, which indicates meridional image plane curvature and sagittal image plane curvature. Fig. 6C shows a distortion curve of the image pickup lens group of embodiment 3, which represents distortion magnitude values in the case of different angles of view. As can be seen from fig. 6A to 6C, the imaging lens group provided in embodiment 3 can achieve good imaging quality.
Example 4
An image pickup lens group according to embodiment 4 of the present application is described below with reference to fig. 7 to 8C. Fig. 7 shows a schematic configuration diagram of an image pickup lens group according to embodiment 4 of the present application.
As shown in fig. 7, the image pickup lens group according to the exemplary embodiment of the present application sequentially includes, from an object side to an image side along an optical axis: a first lens L1, a stop STO, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and an imaging surface S11.
The first lens L1 has an object side surface S1 and an image side surface S2. The second lens L2 has an object side surface S3 and an image side surface S4. The third lens L3 has an object side surface S5 and an image side surface S6. The fourth lens L4 has an object side surface S7 and an image side surface S8. The fifth lens L5 has an object side surface S9 and an image side surface S10. Light from the object sequentially passes through the respective surfaces S1 to S10 and is finally imaged on the imaging surface S11.
In this embodiment, the first lens L1 has positive optical power, and the object-side surface S1 thereof is convex; the second lens L2 has negative optical power; the third lens L3 has positive optical power; the fourth lens L4 has positive focal power, and an image side surface S8 thereof is a convex surface; the fifth lens element L5 has negative refractive power, and has a convex object-side surface S9 at a paraxial region thereof.
Table 10 shows the surface types, the radii of curvature, the thicknesses, the materials, and the cone coefficients of the respective lenses of the imaging lens group of example 4, in which the units of the radii of curvature and the thicknesses are millimeters (mm).
Table 10
As can be seen from table 10, in example 4, the object side surface and the image side surface of any one of the first lens L1 to the fifth lens L5 are aspherical surfaces. Table 11 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 4, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.
TABLE 11
| Face number | A4 | A6 | A8 | A10 | A12 |
| S1 | 1.4261E-03 | 7.7665E-04 | -1.7040E-04 | 2.1852E-04 | -1.0011E-04 |
| S2 | 6.6746E-03 | 9.4962E-04 | -5.9768E-04 | 2.6392E-04 | -1.6272E-04 |
| S3 | 4.4211E-02 | -9.5794E-02 | 1.2471E-01 | -1.1628E-01 | 6.9927E-02 |
| S4 | -1.1215E-02 | -3.6912E-02 | 3.4701E-02 | -1.9986E-02 | 6.8615E-03 |
| S5 | -2.1926E-02 | -1.4155E-02 | 1.5358E-02 | -1.1209E-02 | 4.1484E-03 |
| S6 | 4.1949E-04 | -3.8634E-03 | -6.7671E-04 | -1.3268E-03 | 5.8959E-04 |
| S7 | -2.8773E-02 | 2.4692E-02 | -4.1716E-02 | 5.0524E-02 | -4.7765E-02 |
| S8 | -2.4488E-02 | 1.0801E-02 | -1.5940E-03 | -1.8847E-04 | 7.9198E-05 |
| S9 | -9.4479E-02 | 4.1786E-03 | 5.8217E-03 | -3.6701E-03 | 1.1178E-03 |
| S10 | -5.4206E-02 | 8.1884E-03 | -1.2733E-03 | 1.1548E-04 | -5.3733E-06 |
| Face number | A14 | A16 | A18 | A20 |
| S1 | 9.6701E-06 | 4.7359E-07 | 0.0000E+00 | 0.0000E+00 |
| S2 | 3.9722E-05 | -3.0463E-06 | 0.0000E+00 | 0.0000E+00 |
| S3 | -2.5822E-02 | 5.2065E-03 | -5.5284E-04 | 0.0000E+00 |
| S4 | -1.2558E-03 | 9.0282E-05 | 0.0000E+00 | 0.0000E+00 |
| S5 | -7.7463E-04 | 7.6199E-05 | 0.0000E+00 | 0.0000E+00 |
| S6 | -1.0983E-04 | 2.3873E-05 | 0.0000E+00 | 0.0000E+00 |
| S7 | 2.5903E-02 | -8.3431E-03 | 1.4235E-03 | -8.9286E-05 |
| S8 | 1.1167E-06 | -1.1907E-06 | 0.0000E+00 | 0.0000E+00 |
| S9 | -1.5104E-04 | 7.3828E-06 | 0.0000E+00 | 0.0000E+00 |
| S10 | 3.4115E-09 | 7.7690E-10 | 0.0000E+00 | 0.0000E+00 |
Table 12 gives the effective focal lengths f1 to f5 of the respective lenses in embodiment 4, the total effective focal length f of the imaging lens group, the total optical length TTL of the imaging lens group, and half the diagonal length ImgH of the effective pixel region on the imaging surface S11 of the imaging lens group.
Table 12
| ImgH(mm) | 4.06 | f4(mm) | 11.11 |
| f(mm) | 4.12 | f5(mm) | -11.92 |
| f1(mm) | 8.24 | TTL(mm) | 5.67 |
| f2(mm) | -14.08 | ||
| f3(mm) | 5.78 |
Fig. 8A shows an on-axis chromatic aberration curve of the image-pickup lens group of embodiment 4, which indicates a convergent focus deviation after light rays of different wavelengths pass through the lens. Fig. 8B shows an astigmatism curve of the imaging lens group of embodiment 4, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 8C shows a distortion curve of the image pickup lens group of embodiment 4, which represents distortion magnitude values in the case of different angles of view. As can be seen from fig. 8A to 8C, the imaging lens group provided in embodiment 4 can achieve good imaging quality.
Example 5
An image pickup lens group according to embodiment 5 of the present application is described below with reference to fig. 9 to 10C. Fig. 9 shows a schematic configuration diagram of an image pickup lens group according to embodiment 5 of the present application.
As shown in fig. 9, the image pickup lens group according to the exemplary embodiment of the present application sequentially includes, from an object side to an image side along an optical axis: a first lens L1, a stop STO, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a filter L6, and an imaging surface S13.
The first lens L1 has an object side surface S1 and an image side surface S2. The second lens L2 has an object side surface S3 and an image side surface S4. The third lens L3 has an object side surface S5 and an image side surface S6. The fourth lens L4 has an object side surface S7 and an image side surface S8. The fifth lens L5 has an object side surface S9 and an image side surface S10. The filter L6 has an object side surface S11 and an image side surface S12. Light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging surface S13.
In this embodiment, the first lens L1 has positive optical power, and the object-side surface S1 thereof is convex; the second lens L2 has negative optical power; the third lens L3 has positive optical power; the fourth lens L4 has positive focal power, and an image side surface S8 thereof is a convex surface; the fifth lens element L5 has negative refractive power, and has a convex object-side surface S9 at a paraxial region thereof.
Table 13 shows the surface types, the radii of curvature, the thicknesses, the materials, and the cone coefficients of the respective lenses of the imaging lens group of example 5, in which the units of the radii of curvature and the thicknesses are millimeters (mm).
TABLE 13
As can be seen from table 13, in example 5, the object side surface and the image side surface of any one of the first lens L1 to the fifth lens L5 are aspherical surfaces. Table 14 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 5, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.
TABLE 14
Table 15 shows effective focal lengths f1 to f5 of the respective lenses in embodiment 5, a total effective focal length f of the imaging lens group, an optical total length TTL of the imaging lens group, and half of the diagonal length ImgH of the effective pixel region on the imaging surface S13 of the imaging lens group.
TABLE 15
| ImgH(mm) | 4.05 | f4(mm) | 6.54 |
| f(mm) | 4.15 | f5(mm) | -6.89 |
| f1(mm) | 8.49 | TTL(mm) | 5.89 |
| f2(mm) | -14.67 | ||
| f3(mm) | 8.40 |
Fig. 10A shows an on-axis chromatic aberration curve of the image-pickup lens group of embodiment 5, which indicates a convergent focus deviation after light rays of different wavelengths pass through the lens. Fig. 10B shows an astigmatism curve of the imaging lens group of embodiment 5, which indicates meridional image plane curvature and sagittal image plane curvature. Fig. 10C shows a distortion curve of the image pickup lens group of embodiment 5, which represents distortion magnitude values in the case of different angles of view. As can be seen from fig. 10A to 10C, the imaging lens group provided in embodiment 5 can achieve good imaging quality.
Example 6
An image pickup lens group according to embodiment 6 of the present application is described below with reference to fig. 11 to 12C. Fig. 11 shows a schematic configuration diagram of an image pickup lens group according to embodiment 6 of the present application.
As shown in fig. 11, the image pickup lens group according to the exemplary embodiment of the present application sequentially includes, from an object side to an image side along an optical axis: a first lens L1, a stop STO, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a filter L6, and an imaging surface S13.
The first lens L1 has an object side surface S1 and an image side surface S2. The second lens L2 has an object side surface S3 and an image side surface S4. The third lens L3 has an object side surface S5 and an image side surface S6. The fourth lens L4 has an object side surface S7 and an image side surface S8. The fifth lens L5 has an object side surface S9 and an image side surface S10. The filter L6 has an object side surface S11 and an image side surface S12. Light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging surface S13.
In this embodiment, the first lens L1 has positive optical power, and the object-side surface S1 thereof is convex; the second lens L2 has negative optical power; the third lens L3 has positive optical power; the fourth lens L4 has positive focal power, and an image side surface S8 thereof is a convex surface; the fifth lens element L5 has negative refractive power, and has a convex object-side surface S9 at a paraxial region thereof.
Table 16 shows the surface types, the radii of curvature, the thicknesses, the materials, and the cone coefficients of the respective lenses of the imaging lens group of example 6, in which the units of the radii of curvature and the thicknesses are millimeters (mm).
Table 16
As can be seen from table 16, in example 6, the object side surface and the image side surface of any one of the first lens L1 to the fifth lens L5 are aspherical surfaces. Table 17 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 6, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.
TABLE 17
| Face number | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | 4.0272E-02 | 5.8592E-03 | -2.1999E-02 | 1.6971E-02 | -6.4846E-03 | 1.1525E-03 | -7.6979E-05 |
| S2 | 1.5332E-02 | -2.1310E-02 | 2.8715E-02 | -2.0507E-02 | 7.0926E-03 | -1.2252E-03 | 8.4268E-05 |
| S3 | 2.6892E-02 | -3.5818E-04 | -1.6093E-02 | 2.1551E-02 | -1.2830E-02 | 3.8310E-03 | -4.4477E-04 |
| S4 | -8.7122E-04 | 2.0672E-02 | -5.7329E-02 | 6.0419E-02 | -3.2408E-02 | 8.9823E-03 | -9.8501E-04 |
| S5 | 4.8163E-02 | -5.1394E-02 | 2.8332E-02 | -1.1646E-02 | 2.6790E-03 | -2.6864E-04 | 1.2386E-05 |
| S6 | -1.3831E-04 | 4.1341E-03 | -7.9561E-03 | 3.9485E-03 | -1.2079E-03 | 1.8474E-04 | -7.9157E-06 |
| S7 | -9.0951E-03 | -2.5978E-03 | -3.8847E-05 | -1.5692E-04 | -1.2806E-04 | 4.1498E-05 | -2.2231E-06 |
| S8 | -1.5228E-02 | 4.8685E-03 | -8.4979E-04 | -1.7220E-04 | -2.0126E-07 | 6.5303E-06 | 1.0781E-06 |
| S9 | -1.8918E-01 | 7.3033E-02 | -2.1806E-02 | 4.2963E-03 | -4.7141E-04 | 2.6051E-05 | -5.6411E-07 |
| S10 | -7.4166E-02 | 2.7640E-02 | -6.9532E-03 | 1.0546E-03 | -9.3277E-05 | 4.3915E-06 | -8.4510E-08 |
Table 18 gives the effective focal lengths f1 to f5 of the respective lenses in embodiment 6, the total effective focal length f of the imaging lens group, the total optical length TTL of the imaging lens group, and half the diagonal length ImgH of the effective pixel region on the imaging surface S13 of the imaging lens group.
TABLE 18
| ImgH(mm) | 4.05 | f4(mm) | 6.87 |
| f(mm) | 3.95 | f5(mm) | -5.34 |
| f1(mm) | 8.05 | TTL(mm) | 5.97 |
| f2(mm) | -14.42 | ||
| f3(mm) | 6.63 |
Fig. 12A shows an on-axis chromatic aberration curve of the image-pickup lens group of embodiment 6, which indicates a convergent focus deviation after light rays of different wavelengths pass through the lens. Fig. 12B shows an astigmatism curve of the imaging lens group of embodiment 6, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 12C shows a distortion curve of the image pickup lens group of embodiment 6, which represents distortion magnitude values in the case of different angles of view. As can be seen from fig. 12A to 12C, the image pickup lens group given in embodiment 6 can achieve good imaging quality.
Example 7
An image pickup lens group according to embodiment 7 of the present application is described below with reference to fig. 13 to 14C. Fig. 13 shows a schematic configuration diagram of an image pickup lens group according to embodiment 7 of the present application.
As shown in fig. 13, the image pickup lens group according to the exemplary embodiment of the present application sequentially includes, from an object side to an image side along an optical axis: a first lens L1, a stop STO, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a filter L6, and an imaging surface S13.
The first lens L1 has an object side surface S1 and an image side surface S2. The second lens L2 has an object side surface S3 and an image side surface S4. The third lens L3 has an object side surface S5 and an image side surface S6. The fourth lens L4 has an object side surface S7 and an image side surface S8. The fifth lens L5 has an object side surface S9 and an image side surface S10. The filter L6 has an object side surface S11 and an image side surface S12. Light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging surface S13.
In this embodiment, the first lens L1 has positive optical power, and the object-side surface S1 thereof is convex; the second lens L2 has negative optical power; the third lens L3 has positive optical power; the fourth lens L4 has positive focal power, and an image side surface S8 thereof is a convex surface; the fifth lens element L5 has negative refractive power, and has a convex object-side surface S9 at a paraxial region thereof.
Table 13 shows the surface types, the radii of curvature, the thicknesses, the materials, and the cone coefficients of the respective lenses of the imaging lens group of example 7, in which the units of the radii of curvature and the thicknesses are millimeters (mm).
TABLE 19
As is clear from table 19, in example 7, the object side surface and the image side surface of any one of the first lens L1 to the fifth lens L5 are aspherical surfaces. Table 20 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 7, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.
Table 20
| Face number | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | 1.7524E-02 | 1.2556E-02 | -1.3252E-02 | 6.2044E-03 | -1.5477E-03 | 1.9062E-04 | -9.1655E-06 |
| S2 | 1.3465E-02 | -2.3127E-02 | 2.0652E-02 | -1.0369E-02 | 2.7849E-03 | -3.8178E-04 | 2.0809E-05 |
| S3 | 3.2610E-02 | -6.8563E-03 | -3.7431E-03 | 5.5668E-03 | -2.5493E-03 | 5.5670E-04 | -4.6087E-05 |
| S4 | 1.5459E-02 | 3.3207E-02 | -4.5990E-02 | 3.1543E-02 | -1.1863E-02 | 2.3583E-03 | -1.8964E-04 |
| S5 | 9.2027E-02 | -1.2255E-01 | 1.0107E-01 | -5.5097E-02 | 1.7784E-02 | -3.0903E-03 | 2.2147E-04 |
| S6 | 5.6194E-03 | -9.7923E-03 | 9.4138E-03 | -7.7665E-03 | 3.0626E-03 | -6.1152E-04 | 4.8960E-05 |
| S7 | -8.7038E-03 | -6.3471E-04 | 2.5660E-03 | -2.4311E-03 | 9.9872E-04 | -2.3814E-04 | 2.2388E-05 |
| S8 | -3.3013E-02 | 4.4371E-02 | -4.0265E-02 | 2.0592E-02 | -5.7948E-03 | 8.2506E-04 | -4.5808E-05 |
| S9 | -9.9107E-02 | 3.0631E-02 | -1.0611E-02 | 2.2769E-03 | -2.5179E-04 | 1.3701E-05 | -2.9346E-07 |
| S10 | -9.3851E-02 | 3.6890E-02 | -9.7862E-03 | 1.4912E-03 | -1.2864E-04 | 5.8515E-06 | -1.0882E-07 |
Table 21 shows effective focal lengths f1 to f5 of the respective lenses in embodiment 7, a total effective focal length f of the imaging lens group, an optical total length TTL of the imaging lens group, and half of the diagonal length ImgH of the effective pixel region on the imaging surface S13 of the imaging lens group.
Table 21
| ImgH(mm) | 4.05 | f4(mm) | 7.20 |
| f(mm) | 3.99 | f5(mm) | -16.60 |
| f1(mm) | 7.09 | TTL(mm) | 6.09 |
| f2(mm) | -23.14 | ||
| f3(mm) | 13.26 |
Fig. 14A shows an on-axis chromatic aberration curve of the image-pickup lens group of embodiment 7, which indicates a convergent focus deviation after light rays of different wavelengths pass through the lens. Fig. 14B shows an astigmatism curve of the imaging lens group of embodiment 7, which represents meridional image plane curvature and sagittal image plane curvature. Fig. 14C shows a distortion curve of the image pickup lens group of embodiment 7, which represents distortion magnitude values in the case of different angles of view. As can be seen from fig. 14A to 14C, the image pickup lens group provided in embodiment 7 can achieve good imaging quality.
Example 8
An image pickup lens group according to embodiment 8 of the present application is described below with reference to fig. 15 to 16C. Fig. 15 shows a schematic configuration diagram of an image pickup lens group according to embodiment 8 of the present application.
As shown in fig. 15, the image pickup lens group according to the exemplary embodiment of the present application sequentially includes, from an object side to an image side along an optical axis: a first lens L1, a stop STO, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a filter L6, and an imaging surface S13.
The first lens L1 has an object side surface S1 and an image side surface S2. The second lens L2 has an object side surface S3 and an image side surface S4. The third lens L3 has an object side surface S5 and an image side surface S6. The fourth lens L4 has an object side surface S7 and an image side surface S8. The fifth lens L5 has an object side surface S9 and an image side surface S10. The filter L6 has an object side surface S11 and an image side surface S12. Light from the object sequentially passes through the respective surfaces S1 to S12 and is finally imaged on the imaging surface S13.
In this embodiment, the first lens L1 has positive optical power, and the object-side surface S1 thereof is convex; the second lens L2 has negative optical power; the third lens L3 has positive optical power; the fourth lens L4 has positive focal power, and an image side surface S8 thereof is a convex surface; the fifth lens element L5 has negative refractive power, and has a convex object-side surface S9 at a paraxial region thereof.
Table 15 shows the surface types, the radii of curvature, the thicknesses, the materials, and the cone coefficients of the respective lenses of the imaging lens group of example 8, in which the units of the radii of curvature and the thicknesses are millimeters (mm).
Table 22
As can be seen from table 22, in example 8, the object side surface and the image side surface of any one of the first lens L1 to the fifth lens L5 are aspherical surfaces. Table 23 shows the higher order coefficients that can be used for each of the aspherical mirror surfaces in example 8, wherein each of the aspherical surface types can be defined by the formula (1) given in example 1 above.
Table 23
| Face number | A4 | A6 | A8 | A10 | A12 | A14 | A16 |
| S1 | 3.7686E-02 | -3.8412E-03 | -4.5566E-03 | 4.5028E-03 | -2.0100E-03 | 3.9675E-04 | -2.9002E-05 |
| S2 | 9.3445E-03 | -2.7178E-02 | 4.1684E-02 | -3.6431E-02 | 1.5895E-02 | -3.3811E-03 | 2.7856E-04 |
| S3 | 3.2419E-02 | 1.2422E-02 | -3.9187E-02 | 4.0523E-02 | -2.1303E-02 | 5.9693E-03 | -6.7318E-04 |
| S4 | -9.9284E-02 | 2.8149E-01 | -4.0076E-01 | 3.4134E-01 | -1.6791E-01 | 4.4275E-02 | -4.7775E-03 |
| S5 | 3.5552E-02 | -4.2634E-02 | 1.8539E-02 | -6.7116E-03 | 1.5447E-03 | -1.4247E-04 | 5.9578E-06 |
| S6 | -1.1454E-02 | 1.0495E-03 | -5.1835E-03 | 2.3655E-03 | -8.1011E-04 | 1.3992E-04 | -3.8076E-06 |
| S7 | -4.1368E-03 | -7.2620E-03 | 3.4251E-03 | -7.1795E-04 | -1.1761E-04 | 2.2007E-05 | -1.0694E-06 |
| S8 | -1.1900E-02 | 5.9051E-03 | -1.5453E-03 | 3.1886E-05 | 5.7943E-05 | 6.1033E-06 | -2.0299E-06 |
| S9 | -1.3107E-01 | 4.7737E-02 | -1.3973E-02 | 2.7484E-03 | -3.0915E-04 | 1.8108E-05 | -4.3191E-07 |
| S10 | -5.8210E-02 | 2.0237E-02 | -5.4237E-03 | 8.8223E-04 | -8.4699E-05 | 4.3817E-06 | -9.3246E-08 |
Table 24 gives the effective focal lengths f1 to f5 of the respective lenses in embodiment 8, the total effective focal length f of the imaging lens group, the total optical length TTL of the imaging lens group, and half the diagonal length ImgH of the effective pixel region on the imaging surface S13 of the imaging lens group.
Table 24
| ImgH(mm) | 4.05 | f4(mm) | 6.28 |
| f(mm) | 4.16 | f5(mm) | -6.95 |
| f1(mm) | 7.86 | TTL(mm) | 5.89 |
| f2(mm) | -18.43 | ||
| f3(mm) | 12.04 |
Fig. 16A shows an on-axis chromatic aberration curve of the image-pickup lens group of embodiment 8, which indicates a convergent focus deviation after light rays of different wavelengths pass through the lens. Fig. 16B shows an astigmatism curve of the imaging lens group of embodiment 8, which indicates meridional image plane curvature and sagittal image plane curvature. Fig. 16C shows a distortion curve of the image pickup lens group of embodiment 8, which represents distortion magnitude values in the case of different angles of view. As can be seen from fig. 16A to 16C, the image pickup lens group provided in embodiment 8 can achieve good imaging quality.
In summary, examples 1 to 8 each satisfy the relationship shown in table 25.
Table 25
| Conditional\embodiment | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| f/EPD | 1.10 | 0.95 | 1.20 | 1.09 | 1.20 | 1.20 | 0.95 | 1.20 |
| f1/f | 1.53 | 1.78 | 2.04 | 2.00 | 2.04 | 2.04 | 1.78 | 1.89 |
| TTL/ImgH | 1.38 | 1.50 | 1.69 | 1.40 | 1.45 | 1.48 | 1.50 | 1.45 |
| f4/f | 1.86 | 1.81 | 1.45 | 2.69 | 1.58 | 1.74 | 1.81 | 1.51 |
| R8/f4 | -0.59 | -0.71 | -0.66 | -0.79 | -0.59 | -0.58 | -0.71 | -0.53 |
| CT1/(CT2+CT3) | 1.14 | 1.15 | 0.79 | 0.98 | 0.99 | 0.71 | 1.15 | 1.03 |
| T34/T45 | 0.67 | 0.60 | 0.68 | 0.88 | 0.50 | 0.90 | 0.60 | 0.40 |
| T23/T45 | 0.05 | 0.04 | 0.12 | 0.03 | 0.06 | 0.06 | 0.04 | 0.04 |
| DT12/DT41 | 1.00 | 1.06 | 0.94 | 0.91 | 0.90 | 0.75 | 1.06 | 0.87 |
| T45/TTL | 0.18 | 0.17 | 0.18 | 0.11 | 0.20 | 0.15 | 0.17 | 0.21 |
| T23/T12 | 0.16 | 0.09 | 0.45 | 0.03 | 0.20 | 0.15 | 0.09 | 0.14 |
| T23/T34 | 0.08 | 0.07 | 0.18 | 0.04 | 0.11 | 0.06 | 0.07 | 0.10 |
| |SAG51/CT5| | 1.95 | 2.19 | 2.85 | 0.90 | 2.47 | 2.79 | 2.19 | 2.40 |
The above description is only illustrative of the preferred embodiments of the present application and of the principles of the technology employed. It will be appreciated by persons skilled in the art that the scope of the application referred to in the present application is not limited to the specific combinations of the technical features described above, but also covers other technical features formed by any combination of the technical features described above or their equivalents without departing from the inventive concept. Such as the above-mentioned features and the technical features disclosed in the present application (but not limited to) having similar functions are replaced with each other.
Claims (32)
1. The image capturing lens assembly includes, in order from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens and a fifth lens,
it is characterized in that the method comprises the steps of,
the first lens has positive focal power, and the object side surface of the first lens is a convex surface;
the second lens has positive optical power or negative optical power;
the third lens has positive optical power or negative optical power;
the fourth lens has positive focal power, and the image side surface of the fourth lens is a convex surface;
the fifth lens has negative focal power; and
an effective focal length f1 of the first lens and an effective focal length f of the image pickup lens group satisfy: 1.5< f1/f <2.1;
An air interval T23 of the second lens and the third lens on the optical axis and an air interval T45 of the fourth lens and the fifth lens on the optical axis satisfy: T23/T45 is less than or equal to 0.12;
the number of lenses having optical power in the image pickup lens group is five.
2. The imaging lens group according to claim 1, wherein an effective focal length f of the imaging lens group and an entrance pupil diameter EPD of the imaging lens group satisfy: f/EPD <1.5.
3. The imaging lens group according to claim 1, wherein an effective focal length f4 of the fourth lens and an effective focal length f of the imaging lens group satisfy: 1.4< f4/f <3.
4. The imaging lens system according to claim 3, wherein-1 < R8/f4< -0.5 is satisfied between a radius of curvature R8 of an image side surface of the fourth lens and an effective focal length f4 of the fourth lens.
5. The image pickup lens group according to claim 1, wherein a center thickness CT1 of the first lens on the optical axis, a center thickness CT2 of the second lens on the optical axis, and a center thickness CT3 of the third lens on the optical axis satisfy: 0.7< CT1/(CT2+CT3) <1.3.
6. The image capturing lens assembly of claim 1, wherein an air space T45 between the fourth lens and the fifth lens on the optical axis and an optical total length TTL of the image capturing lens assembly satisfy: 0.1< T45/TTL <0.3.
7. The imaging lens system according to claim 1, wherein an effective half-diameter DT12 of the first lens image side surface and an effective half-diameter DT41 of the fourth lens object side surface satisfy: 0.7< DT12/DT41<1.2.
8. The imaging lens system according to claim 1, wherein an object side surface of the fifth lens element is convex.
9. The imaging lens assembly of claim 8, wherein said fifth lens element has at least one inflection point on an object side or an image side.
10. The imaging lens set according to claim 8 or 9, wherein: 0.8< |SAG51/CT5| <3,
wherein SAG51 is an on-axis distance between an intersection point of the fifth lens object side surface and the optical axis and an effective radius vertex of the fifth lens object side surface, and CT5 is a center thickness of the fifth lens on the optical axis.
11. The imaging lens group according to claim 1, wherein an optical total length TTL of the imaging lens group and a half of a diagonal length ImgH of an effective pixel region on an imaging surface of the imaging lens group satisfy: TTL/ImgH <1.7.
12. The image capturing lens assembly includes, in order from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens and a fifth lens,
it is characterized in that the method comprises the steps of,
the first lens has positive focal power, and the object side surface of the first lens is a convex surface;
the second lens has positive optical power or negative optical power;
the third lens has positive optical power or negative optical power;
the fourth lens has positive focal power, and the image side surface of the fourth lens is a convex surface;
the fifth lens has negative focal power; and
the effective half-caliber DT12 of the first lens image side surface and the effective half-caliber DT41 of the fourth lens object side surface satisfy the following conditions: 0.7< DT12/DT41<1.2;
an air interval T23 of the second lens and the third lens on the optical axis and an air interval T45 of the fourth lens and the fifth lens on the optical axis satisfy: T23/T45 is less than or equal to 0.12;
the number of lenses having optical power in the image pickup lens group is five.
13. The image pickup lens group according to claim 12, wherein a center thickness CT1 of the first lens on the optical axis, a center thickness CT2 of the second lens on the optical axis, and a center thickness CT3 of the third lens on the optical axis satisfy: 0.7< CT1/(CT2+CT3) <1.3.
14. The image capturing lens assembly according to claim 12 or 13, wherein an air space T45 between the fourth lens and the fifth lens on the optical axis and an optical total length TTL of the image capturing lens assembly satisfy: 0.1< T45/TTL <0.3.
15. The imaging lens set according to claim 13, wherein an effective focal length f1 of the first lens and an effective focal length f of the imaging lens set satisfy: 1.5< f1/f <2.1.
16. The imaging lens group according to claim 15, wherein an effective focal length f of the imaging lens group and an entrance pupil diameter EPD of the imaging lens group satisfy: f/EPD <1.5.
17. The imaging lens set according to claim 12, wherein an effective focal length f4 of the fourth lens and an effective focal length f of the imaging lens set satisfy: 1.4< f4/f <3.
18. The imaging lens system according to claim 17, wherein-1 < R8/f4< -0.5 is satisfied between a radius of curvature R8 of an image side surface of the fourth lens and an effective focal length f4 of the fourth lens.
19. The imaging lens assembly of claim 12, wherein the fifth lens element has at least one inflection point on an object-side or image-side surface.
20. The imaging lens system according to claim 19, wherein an object side surface of the fifth lens element is convex.
21. The imaging lens set according to claim 12, wherein: 0.8< |SAG51/CT5| <3,
wherein SAG51 is an on-axis distance between an intersection point of the fifth lens object side surface and the optical axis to an effective radius vertex of the fifth lens object side surface, and
CT5 is the center thickness of the fifth lens on the optical axis.
22. The imaging lens group according to claim 12, wherein an optical total length TTL of the imaging lens group and a half of a diagonal length ImgH of an effective pixel region on an imaging surface of the imaging lens group satisfy: TTL/ImgH <1.7.
23. The image capturing lens assembly includes, in order from an object side to an image side along an optical axis: a first lens, a second lens, a third lens, a fourth lens and a fifth lens,
it is characterized in that the method comprises the steps of,
the first lens has positive focal power, and the object side surface of the first lens is a convex surface;
the second lens has positive optical power or negative optical power;
the third lens has positive optical power or negative optical power;
the fourth lens has positive focal power, and the image side surface of the fourth lens is a convex surface;
The fifth lens has negative focal power; and
an air interval T23 of the second lens and the third lens on the optical axis and an air interval T45 of the fourth lens and the fifth lens on the optical axis satisfy: T23/T45 is less than or equal to 0.12;
the number of lenses having optical power in the image pickup lens group is five.
24. The imaging lens group according to claim 23, wherein an effective focal length f of the imaging lens group and an entrance pupil diameter EPD of the imaging lens group satisfy: f/EPD <1.5.
25. The imaging lens set according to claim 23, wherein an effective focal length f4 of the fourth lens and an effective focal length f of the imaging lens set satisfy: 1.4< f4/f <3.
26. The imaging lens system according to claim 25, wherein-1 < R8/f4< -0.5 is satisfied between a radius of curvature R8 of an image side surface of the fourth lens and an effective focal length f4 of the fourth lens.
27. The imaging lens system according to claim 23, wherein a center thickness CT1 of the first lens on the optical axis, a center thickness CT2 of the second lens on the optical axis, and a center thickness CT3 of the third lens on the optical axis satisfy: 0.7< CT1/(CT2+CT3) <1.3.
28. The image capturing lens assembly of claim 27, wherein an air space T45 between said fourth lens and said fifth lens on said optical axis and an optical total length TTL of said image capturing lens assembly satisfy: 0.1< T45/TTL <0.3.
29. The imaging lens assembly of claim 23, wherein an object side surface of said fifth lens element is convex.
30. The imaging lens assembly of claim 29, wherein said fifth lens element has at least one inflection point on an object side or an image side.
31. The imaging lens set according to claim 29 or 30, wherein: 0.8< |SAG51/CT5| <3,
wherein SAG51 is an on-axis distance between an intersection point of the fifth lens object side surface and the optical axis to an effective radius vertex of the fifth lens object side surface, and
CT5 is the center thickness of the fifth lens on the optical axis.
32. The imaging lens group according to claim 23, wherein an optical total length TTL of the imaging lens group and a half of a diagonal length ImgH of an effective pixel region on an imaging surface of the imaging lens group satisfy: TTL/ImgH <1.7.
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| CN108333725B (en) * | 2018-05-09 | 2023-06-30 | 浙江舜宇光学有限公司 | Image pickup lens group |
| CN108627954B (en) * | 2018-05-15 | 2024-01-23 | 辽宁中蓝光电科技有限公司 | A camera lens group |
| JP7011986B2 (en) * | 2018-07-30 | 2022-01-27 | 東京晨美光学電子株式会社 | Imaging lens |
| CN110596866B (en) * | 2019-10-29 | 2024-08-20 | 浙江舜宇光学有限公司 | Optical imaging lens |
| CN110989139B (en) * | 2019-12-24 | 2021-11-23 | 浙江舜宇光学有限公司 | Optical imaging lens |
| CN113640940A (en) * | 2020-05-11 | 2021-11-12 | 新巨科技股份有限公司 | Five-piece infrared single-focus lens group |
| CN113805307B (en) * | 2020-06-12 | 2022-09-02 | 新巨科技股份有限公司 | Five-piece infrared single-focus lens group |
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