CN108279483B - Image pickup lens assembly - Google Patents

Image pickup lens assembly Download PDF

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CN108279483B
CN108279483B CN201810194778.9A CN201810194778A CN108279483B CN 108279483 B CN108279483 B CN 108279483B CN 201810194778 A CN201810194778 A CN 201810194778A CN 108279483 B CN108279483 B CN 108279483B
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lens
lens group
image
imaging
satisfy
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CN108279483A (en
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徐标
张凯元
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Zhejiang Sunny Optics Co Ltd
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Zhejiang Sunny Optics Co Ltd
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Priority to PCT/CN2018/107654 priority patent/WO2019169856A1/en
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G02B13/004—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having four lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B9/00—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -
    • G02B9/34—Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or - having four components only

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  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)

Abstract

The present application discloses a photographing lens assembly, sequentially comprising, from an object side to an image side along an optical axis: the lens includes a first lens, a second lens, a third lens and a fourth 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 focal power; the third lens has positive focal power, the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a convex surface; the fourth lens has a negative power. The maximum half field angle HFOV of the camera lens group meets the requirement that the HFOV is more than 45 degrees and less than 50 degrees.

Description

Image pickup lens assembly
Technical Field
The present application relates to a photographing lens group, and more particularly, to a photographing lens group including four lenses.
Background
With the popularization of portable electronic products such as mobile phones and tablet computers, people increasingly need to diversify the functions of the products. Meanwhile, with the development of scientific technology, the 3D camera shooting technology is more and more mature and widely applied to portable electronic products. Most of the existing miniaturized lenses capable of imaging based on infrared bands cannot give consideration to large aperture, large field angle and high imaging quality.
Therefore, there is a need for an infrared-based imaging lens assembly that is compact, has a large aperture, a large field angle, and good imaging performance.
Disclosure of Invention
The present application provides a photographing lens assembly applicable to a portable electronic product that can solve at least or partially at least one of the above-mentioned disadvantages of the related art.
In one aspect, the present application provides a lens assembly for image taking, in order from an object side to an image side along an optical axis comprising: the lens includes a first lens, a second lens, a third lens and a fourth lens. The first lens can have positive focal power, and the object side surface of the first lens can be a convex surface; the second lens may have a positive optical power; the third lens can have positive focal power, and the object side surface of the third lens can be a concave surface, and the image side surface of the third lens can be a convex surface; the fourth lens may have a negative optical power. Wherein, the maximum half field angle HFOV of the camera lens group can satisfy 45 degrees < HFOV < 50 degrees.
In one embodiment, the effective focal length f2 of the second lens and the radius of curvature R5 of the object side surface of the third lens can satisfy 8 ≦ f2/R5 ≦ 28.
In one embodiment, the total effective focal length f of the image pickup lens group and the radius of curvature R1 of the object side surface of the first lens element satisfy 1 < f/R1 < 2.
In one embodiment, the total effective focal length f of the image capturing lens group and the effective focal length f2 of the second lens element satisfy 0 < f/f2 < 0.25.
In one embodiment, the radius of curvature R3 of the object-side surface of the second lens and the radius of curvature R4 of the image-side surface of the second lens satisfy 1 < | R3/R4| < 3.
In one embodiment, the combined focal length f23 of the second lens and the third lens, the central thickness CT3 of the third lens on the optical axis, and the central thickness CT4 of the fourth lens on the optical axis satisfy 0.50 < f23/(CT4+ CT3) ≦ 4.50.
In one embodiment, a separation distance T34 between the third lens and the fourth lens on the optical axis and a separation distance T23 between the second lens and the third lens on the optical axis may satisfy T34/T23 < 0.2.
In one embodiment, the image capturing lens group may further include an infrared band pass filter disposed between the fourth lens element and the imaging surface of the image capturing lens group, and the band pass filter may have a band pass band of 750nm to 1000 nm. Alternatively, the band pass band of the infrared band pass filter may be 850nm to 940 nm.
In one embodiment, the total effective focal length f of the image capturing lens group and the total effective focal length EPD of the image capturing lens group satisfy f/EPD ≦ 2.0.
In one embodiment, the distance TT L from the center of the object side surface of the first lens element to the imaging surface of the image taking lens group on the optical axis and the half of the diagonal length of the effective pixel area on the imaging surface of the image taking lens group ImgH satisfy TT L/ImgH < 1.6.
In one embodiment, the sum ∑ AT of the distances between any two adjacent lenses of the first to fourth lenses on the optical axis and the distance TT L between the center of the object side surface of the first lens and the imaging surface of the image pickup lens group on the optical axis can satisfy 0.15 ≦ ∑ AT/TT L < 0.25.
In another aspect, the present application provides a lens assembly for image taking, in order from an object side to an image side along an optical axis, comprising: the lens comprises a first lens, a second lens, a third lens, a fourth lens and an optical filter. The first lens can have positive focal power, and the object side surface of the first lens can be a convex surface; the second lens may have a positive optical power; the third lens can have positive focal power, and the object side surface of the third lens can be a concave surface, and the image side surface of the third lens can be a convex surface; the fourth lens can have negative focal power, the filter can be an infrared band-pass filter, and the band-pass band of the filter can be 750nm to 1000 nm.
In one embodiment, the band pass band of the infrared band pass filter may be 850nm to 940 nm.
The present application adopts a plurality of (for example, four) lenses, and the above-mentioned camera lens group has at least one advantageous effect of miniaturization, large aperture, large field angle, high imaging quality, etc. by reasonably distributing the focal power, surface shape, central thickness of each lens, and on-axis distance between each lens, etc.
Drawings
Other features, objects, and advantages of the present application will become more apparent from the following detailed description of non-limiting embodiments when taken in conjunction with the accompanying drawings. In the drawings:
fig. 1 shows a schematic configuration diagram of a photographing lens group according to embodiment 1 of the present application;
fig. 2A to 2D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the image capturing lens group of embodiment 1;
fig. 3 shows a schematic configuration diagram of a photographing lens group according to embodiment 2 of the present application;
fig. 4A to 4D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the image capturing lens group of embodiment 2;
fig. 5 is a schematic view showing the structure of a photographing lens group according to embodiment 3 of the present application;
fig. 6A to 6D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a magnification chromatic aberration curve, respectively, of the image capturing lens group of embodiment 3;
fig. 7 is a schematic view showing the structure of a photographing lens group according to embodiment 4 of the present application;
fig. 8A to 8D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the image capturing lens group of embodiment 4;
fig. 9 is a schematic view showing the structure of a photographing lens group according to embodiment 5 of the present application;
fig. 10A to 10D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the image capturing lens group of embodiment 5;
fig. 11 is a schematic view showing the structure of a photographing lens group according to embodiment 6 of the present application;
fig. 12A to 12D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the image taking lens group of embodiment 6;
fig. 13 is a schematic view showing the structure of a photographing lens group according to embodiment 7 of the present application;
fig. 14A to 14D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the image capturing lens group of embodiment 7;
fig. 15 is a schematic view showing the structure of a photographing lens group according to embodiment 8 of the present application;
fig. 16A to 16D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the image capturing lens group of embodiment 8;
fig. 17 is a schematic view showing the structure of a photographing lens group according to embodiment 9 of the present application;
fig. 18A to 18D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the image capturing lens group of embodiment 9;
fig. 19 is a schematic view showing the structure of a photographing lens group according to embodiment 10 of the present application;
fig. 20A to 20D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the image capturing lens group of embodiment 10;
fig. 21 is a schematic view showing the structure of a photographing lens group according to embodiment 11 of the present application;
fig. 22A to 22D show an on-axis chromatic aberration curve, an astigmatism curve, a distortion curve, and a chromatic aberration of magnification curve, respectively, of the image capturing lens group of embodiment 11.
Detailed Description
For a better understanding of the present application, various aspects of the present 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 present application and does not limit the scope of the present 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 this specification, the expressions first, second, third, etc. are used only to distinguish one feature from another, and do not represent any limitation on the features. Thus, the first lens discussed below may also be referred to as the second lens or the third lens without departing from the teachings of the present application.
In the drawings, the thickness, size, and shape of the lens have been slightly exaggerated for convenience of explanation. In particular, the shapes of the spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shape of the spherical surface or the aspherical surface is not limited to the shape of the spherical surface or the aspherical surface shown in the drawings. The figures are purely diagrammatic and 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, it means that 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 called the object side surface, and the surface of each lens closest to the image plane is called the image side surface.
It will be further understood that the terms "comprises," "comprising," "has," "having," "includes" 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. Moreover, when a statement such as "at least one of" appears after a list of listed features, the entirety of the listed features is modified rather than modifying individual elements in the list. Furthermore, when describing embodiments of the present application, the use of "may" mean "one or more embodiments of the present 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 the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
The features, principles, and other aspects of the present application are described in detail below.
The image pickup lens group according to an exemplary embodiment of the present application may include, for example, four lenses having optical powers, i.e., a first lens, a second lens, a third lens, and a fourth lens. The four lenses are arranged in sequence from the object side to the image side along the optical axis.
In an exemplary embodiment, the first lens may have a positive optical power, and the object-side surface thereof may be convex; the second lens may have a positive optical power; the third lens can have positive focal power, and the object side surface of the third lens can be a concave surface, and the image side surface of the third lens can be a convex surface; the fourth lens may have a negative optical power.
In an exemplary embodiment, the image side surface of the first lens may be concave.
In an exemplary embodiment, the object-side surface of the second lens may be concave, and the image-side surface may be convex.
In an exemplary embodiment, the object-side surface of the fourth lens element may be convex and the image-side surface may be concave.
In an exemplary embodiment, the image capturing lens group of the present application may satisfy the conditional expression 8 ≦ f2/R5 ≦ 28, where f2 is an effective focal length of the second lens and R5 is a radius of curvature of an object side surface of the third lens. More specifically, f2 and R5 can further satisfy 8.13 ≦ f2/R5| ≦ 27.59. By controlling the ratio of the effective focal length of the second lens and the curvature radius of the object side surface of the third lens in a certain range, the reasonable distribution of focal power can be realized, the third-order astigmatism of the optical system is controlled in a certain range, and the astigmatism generated by the front-end optical element and the rear-end optical element of the system is balanced, so that the optical system has good imaging quality.
In an exemplary embodiment, the image capturing lens group of the present application may include an infrared band pass filter disposed between the fourth lens element and the imaging surface, and the band pass filter may have a band pass band of about 750nm to about 1000nm, and further, the band pass band may be about 850nm to about 940 nm. The infrared band-pass filter is arranged between the fourth lens and the imaging surface, so that infrared light can pass through the infrared band-pass filter and stray light can be filtered, and signal interference caused by non-infrared light, such as imaging blurring caused by chromatic aberration introduced by the non-infrared light, can be eliminated.
In an exemplary embodiment, the image pickup lens group of the present application may satisfy the conditional expression 45 ° < HFOV < 50 °, wherein HFOV is the maximum half field angle of the image pickup lens group. More specifically, the HFOV further can satisfy 46.6 ≦ HFOV ≦ 48.8. By optimizing the optical system, the maximum field angle of the optical system is larger than 90 degrees, and the wide-angle characteristic is realized, so that the field of view requirement of portable electronic products is met.
In an exemplary embodiment, the image capturing lens assembly of the present application can satisfy the conditional expression f/EPD ≦ 2.0, where f is the total effective focal length of the image capturing lens assembly, and EPD is the entrance pupil diameter of the image capturing lens assembly. More specifically, f and EPD further satisfy 1.90 ≦ f/EPD ≦ 1.96. The large aperture of the system is realized by reasonably distributing the optical power of the system so that the F number (namely, F/EPD) of the system is less than 2.
In an exemplary embodiment, the photographing lens group of the present application may satisfy a conditional expression TT L/ImgH < 1.6, where TT L is a distance on an optical axis from a center of an object-side surface of the first lens element to an imaging surface of the photographing lens group, and ImgH is a half of a diagonal length of an effective pixel area on the imaging surface of the photographing lens group, and more particularly, TT L and ImgH may further satisfy 1.36 ≦ TT L/ImgH ≦ 1.53.
In an exemplary embodiment, the image capturing lens group of the present application may satisfy the conditional expression 1 < f/R1 < 2, where f is the total effective focal length of the image capturing lens group, and R1 is the radius of curvature of the object side surface of the first lens. More specifically, f and R1 further satisfy 1.13. ltoreq. f/R1. ltoreq.1.89. The ratio of the total effective focal length of the camera lens group to the curvature radius of the object side surface of the first lens is controlled within a certain range, so that the contribution of the lens to the fifth-order spherical aberration of the system can be well controlled, and further the third-order spherical aberration generated by the lens is compensated, so that the system has good imaging quality on the axis.
In an exemplary embodiment, the image capturing lens group of the present application may satisfy the conditional expression 0 < f/f2 < 0.25, where f is the total effective focal length of the image capturing lens group and f2 is the effective focal length of the second lens. More specifically, f and f2 further satisfy 0.07. ltoreq. f/f 2. ltoreq.0.21. The condition that f/f2 is more than 0.25 is satisfied, and the imaging quality of the lens is improved. By controlling the ratio of the total effective focal length of the camera lens group to the effective focal length of the second lens, the lens aberration can be effectively corrected, and the tolerance sensitivity is reduced.
In an exemplary embodiment, the image capturing lens group of the present application may satisfy the conditional expression 1 < | R3/R4| < 3, where R3 is a radius of curvature of an object side surface of the second lens and R4 is a radius of curvature of an image side surface of the second lens. More specifically, R3 and R4 can further satisfy 1.38 ≦ R3/R4| ≦ 2.80. The curvature radius of the object side surface and the curvature radius of the image side surface of the second lens are controlled within a certain range, so that the deflection angle of the marginal light rays of the system can be reasonably controlled, and the sensitivity of the system is effectively reduced.
In an exemplary embodiment, the image capturing lens assembly of the present application may satisfy the conditional expression 0.50 < f23/(CT4+ CT3) ≦ 4.50, where f23 is a combined focal length of the second lens and the third lens, CT3 is a central thickness of the third lens on the optical axis, and CT4 is a central thickness of the fourth lens on the optical axis. More specifically, f23, CT3 and CT4 may further satisfy 0.80 < f23/(CT4+ CT3) ≦ 4.50, for example, 0.88 ≦ f23/(CT4+ CT3) ≦ 4.50. By restricting the ratio of the combined focal length of the second lens and the third lens to the sum of the central thicknesses of the third lens axis and the fourth lens axis, the coma aberration of the system can be reasonably controlled, so that the optical system has good optical performance.
In an exemplary embodiment, the image pickup lens group of the present application may satisfy the conditional expression T34/T23 < 0.2, where T34 is a distance of separation of the third lens and the fourth lens on the optical axis, and T23 is a distance of separation of the second lens and the third lens on the optical axis. More specifically, T34 and T23 may further satisfy 0.08 ≦ T34/T23 ≦ 0.18. By restricting the ratio of the air space of the third lens and the fourth lens to the air space of the second lens and the third lens, the field curvature contribution amount of each field of view can be controlled within a reasonable range.
In an exemplary embodiment, the image pickup lens group of the present application may satisfy the conditional expression 0.15 ≦ ∑ AT/TT L < 0.25, where ∑ AT is a sum of distances of intervals on the optical axis of any adjacent two lenses of the respective lenses having power, and TT L is a distance on the optical axis of the object side surface of the first lens to the image plane, more specifically, ∑ AT and TT L may further satisfy 0.15 ≦ ∑ AT/TT L ≦ 0.20.
It should be understood that, in an image pickup lens group including four lens elements having optical powers, ∑ AT is T12+ T23+ T34, where T12 is a distance of separation of the first lens element and the second lens element on the optical axis, T23 is a distance of separation of the second lens element and the third lens element on the optical axis, and T34 is a distance of separation of the third lens element and the fourth lens element on the optical axis.
In an exemplary embodiment, the photographing lens group may further include at least one diaphragm to improve the imaging quality of the lens. For example, a diaphragm may be disposed between the object side and the first lens. For another example, the stop may also be disposed between the first lens and the second lens.
Optionally, the above-mentioned image pickup lens group may further include a filter for correcting color deviation and/or a protective glass for protecting the photosensitive element on the image plane.
The image pickup lens group according to the above-described embodiment of the present application may employ a plurality of lenses, for example, four lenses as described above. By reasonably distributing the focal power, the surface shape, the central thickness of each lens, the on-axis distance between each lens and the like, the volume of the lens group can be effectively reduced, the sensitivity of the lens group can be reduced, and the machinability of the lens group can be improved, so that the camera lens group is more favorable for production and processing and can be suitable for portable electronic products.
The image pickup lens group configured as described above can image based on the infrared band and also has characteristics of a large aperture, a large angle of view, and good image quality.
In the embodiment of the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface. The aspheric 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 better curvature radius characteristics, and has advantages of improving distortion aberration and improving astigmatic aberration. After the aspheric lens is adopted, the aberration generated during imaging can be eliminated as much as possible, thereby improving the imaging quality.
However, it will be appreciated by those skilled in the art that the number of lenses constituting the imaging lens group can be varied to achieve the various results and advantages described in this specification without departing from the claimed subject matter. For example, although four lenses are exemplified in the embodiment, the image pickup lens group is not limited to including four lenses. The image pickup lens group may further include other numbers of lenses if necessary.
Specific examples of the image pickup lens group applicable to the above embodiments are further described below with reference to the drawings.
Example 1
An image capturing lens group according to embodiment 1 of the present application is described below with reference to fig. 1 to 2D. Fig. 1 shows a schematic configuration diagram of an image capturing lens group according to embodiment 1 of the present application.
As shown in fig. 1, an image capturing lens assembly according to an exemplary embodiment of the present application, in order from an object side to an image side, comprises: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a filter E5, and an image plane S11.
The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a concave object-side surface S3 and a convex image-side surface S4. The third lens element E3 has positive power, and has a concave object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative power, and has a convex object-side surface S7 and a concave image-side surface S8. Filter E5 has an object side S9 and an image side S10, which may be an infrared bandpass filter having a bandpass band of about 750nm to about 1000nm, and further having a bandpass band of about 850nm to about 940 nm. The light from the object sequentially passes through the respective surfaces S1 to S10 and is finally imaged on the imaging surface S11.
Table 1 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the image pickup lens group of embodiment 1, wherein the unit of the radius of curvature and the thickness are both millimeters (mm).
Figure BDA0001592758330000091
Figure BDA0001592758330000101
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 element E1 through the fourth lens element E4 are aspheric. In the present embodiment, the profile x of each aspheric lens can be defined using, but not limited to, the following aspheric formula:
Figure BDA0001592758330000102
wherein x is the rise of the distance from the aspheric surface vertex to the aspheric surface vertex when the aspheric surface is at the position with the height of h along the optical axis direction; c is the paraxial curvature of the aspheric surface, c being 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 i-th order of the aspherical surface. Table 2 below shows the high-order coefficient A of each of the aspherical mirror surfaces S1 to S8 used in example 14、A6、A8、A10、A12、A14And A16。
Flour mark A4 A6 A8 A10 A12 A14 A16
S1 -4.8485E-02 2.2385E-01 -1.8606E+00 7.0654E+00 -1.5684E+01 1.8055E+01 -8.9239E+00
S2 2.7359E-01 -1.4311E+00 5.8339E+00 -2.0239E+01 4.3114E+01 -5.2695E+01 2.6977E+01
S3 -2.4984E-01 -7.3536E-02 -1.2763E-01 -4.8674E+00 2.0863E+01 -4.2455E+01 3.2385E+01
S4 -3.3720E-01 1.2926E-01 -4.6449E-02 -6.2993E-01 1.3506E+00 -1.1974E+00 5.7292E-01
S5 -1.6085E-01 3.5366E-01 -1.4069E+00 3.5626E+00 -3.7407E+00 1.7989E+00 -3.3026E-01
S6 -6.3170E-01 1.4318E+00 -2.9381E+00 3.8705E+00 -2.7472E+00 9.8973E-01 -1.4378E-01
S7 -1.2551E-01 -1.3721E-01 2.7392E-01 -2.1463E-01 8.2793E-02 -1.5283E-02 1.0720E-03
S8 -1.1290E-01 3.5309E-02 6.4591E-03 -1.2965E-02 5.1133E-03 -9.0219E-04 6.2800E-05
TABLE 2
Table 3 gives the effective focal lengths f1 to f4 of the respective lenses, the total effective focal length f of the image-taking lens group, the total optical length TT L (i.e., the distance on the optical axis from the center of the object-side surface S1 of the first lens E1 to the imaging surface S11), half ImgH of the diagonal length of the effective pixel region on the imaging surface S11, and the maximum half field angle HFOV in embodiment 1.
f1(mm) 4.30 f(mm) 2.56
f2(mm) 12.28 TTL(mm) 3.84
f3(mm) 1.10 ImgH(mm) 2.74
f4(mm) -1.17 HFOV(°) 47.0
TABLE 3
The imaging lens group in embodiment 1 satisfies:
i f2/R5| ═ 8.13, where f2 is the effective focal length of the second lens E2, and R5 is the radius of curvature of the object-side S5 of the third lens E3;
f/EPD is 1.95, wherein f is the total effective focal length of the camera lens group, and EPD is the entrance pupil diameter of the camera lens group;
TT L/ImgH is 1.40, where TT L is the distance on the optical axis from the center of the object-side surface S1 of the first lens E1 to the imaging surface S11, and ImgH is half the diagonal length of the effective pixel area on the imaging surface S11;
f/R1 is 1.79, where f is the total effective focal length of the image capturing lens group, and R1 is the radius of curvature of the object side S1 of the first lens element E1;
f/f2 is 0.21, where f is the total effective focal length of the image capturing lens group, and f2 is the effective focal length of the second lens element E2;
l R3/R4| ═ 2.18, where R3 is the radius of curvature of the object-side surface S3 of the second lens E2, and R4 is the radius of curvature of the image-side surface S4 of the second lens E2;
f23/(CT3+ CT4) ═ 1.17, where f23 is the combined focal length of the second lens E2 and the third lens E3, CT3 is the central thickness of the third lens E3 on the optical axis, and CT4 is the central thickness of the fourth lens E4 on the optical axis;
T34/T23 is 0.08, where T34 is the distance between the third lens E3 and the fourth lens E4 on the optical axis, and T23 is the distance between the second lens E2 and the third lens E3 on the optical axis;
∑ AT/TT L is 0.19, where ∑ AT is the sum of the distances between any two adjacent lenses of the first lens E1 to the fourth lens E4 on the optical axis, and TT L is the distance between the center of the object side surface S1 of the first lens E1 and the imaging surface S11 on the optical axis.
Fig. 2A shows a chromatic aberration curve on the axis of the image-taking lens group of embodiment 1, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the lens. Fig. 2B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the image pickup lens group of embodiment 1. Fig. 2C shows a distortion curve of the image capturing lens group of embodiment 1, which represents the distortion magnitude values in the case of different angles of view. Fig. 2D shows a chromatic aberration of magnification curve of the imaging lens group of embodiment 1, which represents a deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 2A to 2D, the image capturing lens assembly of embodiment 1 can achieve good image quality.
Example 2
An image capturing lens group according to embodiment 2 of the present application is described below with reference to fig. 3 to 4D. In this embodiment and the following embodiments, descriptions of parts similar to those of embodiment 1 will be omitted for the sake of brevity. Fig. 3 shows a schematic configuration diagram of a photographing lens group according to embodiment 2 of the present application.
As shown in fig. 3, the image capturing lens assembly according to the exemplary embodiment of the present application, in order from an object side to an image side, comprises: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a filter E5, and an image plane S11.
The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a concave object-side surface S3 and a convex image-side surface S4. The third lens element E3 has positive power, and has a concave object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative power, and has a convex object-side surface S7 and a concave image-side surface S8. Filter E5 has an object side S9 and an image side S10, which may be an infrared bandpass filter having a bandpass band of about 750nm to about 1000nm, and further having a bandpass band of about 850nm to about 940 nm. The light from the object sequentially passes through the respective surfaces S1 to S10 and is finally imaged on the imaging surface S11.
Table 4 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the image pickup lens group of embodiment 2, wherein the unit of the radius of curvature and the thickness are both millimeters (mm).
Figure BDA0001592758330000121
Figure BDA0001592758330000131
TABLE 4
As is clear from table 4, in example 2, both the object-side surface and the image-side surface of any one of the first lens element E1 through the fourth lens element E4 are aspheric. Table 5 shows high-order term coefficients that can be used for each aspherical mirror surface in example 2, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.
Flour mark A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 -8.1333E-02 1.3787E+00 -2.0646E+01 1.7286E+02 -8.8203E+02 2.7778E+03 -5.2778E+03 5.5446E+03 -2.4750E+03
S2 2.9068E-01 -2.3178E+00 1.9772E+01 -1.3607E+02 6.1225E+02 -1.7589E+03 3.0924E+03 -3.0324E+03 1.2698E+03
S3 -3.4632E-01 1.7342E+00 -2.0862E+01 1.3295E+02 -5.3996E+02 1.3701E+03 -2.1187E+03 1.8171E+03 -6.5394E+02
S4 -3.0678E-01 8.4520E-02 1.2268E+00 -1.1875E+01 4.4721E+01 -9.3114E+01 1.1158E+02 -7.1340E+01 1.8941E+01
S5 -1.7985E-01 4.9918E-01 -1.8965E+00 4.6879E+00 -6.3154E+00 6.4546E+00 -5.2385E+00 2.6247E+00 -5.5487E-01
S6 -6.4429E-01 1.4509E+00 -2.8092E+00 3.3625E+00 -2.0522E+00 5.4790E-01 -2.1821E-02 -4.6788E-03 -2.6544E-03
S7 -1.4331E-01 -2.2022E-02 -5.7318E-03 1.4464E-01 -1.8716E-01 1.0862E-01 -3.3260E-02 5.2699E-03 -3.4305E-04
S8 -1.0911E-01 4.4573E-02 -2.1075E-02 1.3772E-02 -7.9647E-03 2.5198E-03 -3.7746E-04 1.6403E-05 9.7908E-07
TABLE 5
Table 6 gives the effective focal lengths f1 to f7 of the respective lenses, the total effective focal length f of the image pickup lens group, the total optical length TT L, half ImgH of the diagonal length of the effective pixel region on the imaging plane S11, and the maximum half field angle HFOV in embodiment 2.
f1(mm) 4.14 f(mm) 2.56
f2(mm) 15.32 TTL(mm) 3.82
f3(mm) 1.08 ImgH(mm) 2.74
f4(mm) -1.18 HFOV(°) 47.1
TABLE 6
Fig. 4A shows a chromatic aberration curve on the axis of the image-taking lens group of embodiment 2, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the lens. Fig. 4B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the image pickup lens group of embodiment 2. Fig. 4C shows a distortion curve of the image capturing lens group of embodiment 2, which represents the distortion magnitude values in the case of different angles of view. Fig. 4D shows a chromatic aberration of magnification curve of the imaging lens group of embodiment 2, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 4A to 4D, the image capturing lens assembly according to embodiment 2 can achieve good image quality.
Example 3
A photographing lens group according to embodiment 3 of the present application is described below with reference to fig. 5 to 6D. Fig. 5 shows a schematic structural view of a photographing lens group according to embodiment 3 of the present application.
As shown in fig. 5, the image capturing lens assembly according to the exemplary embodiment of the present application, in order from an object side to an image side, comprises: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a filter E5, and an image plane S11.
The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a concave object-side surface S3 and a convex image-side surface S4. The third lens element E3 has positive power, and has a concave object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative power, and has a convex object-side surface S7 and a concave image-side surface S8. Filter E5 has an object side S9 and an image side S10, which may be an infrared bandpass filter having a bandpass band of about 750nm to about 1000nm, and further having a bandpass band of about 850nm to about 940 nm. The light from the object sequentially passes through the respective surfaces S1 to S10 and is finally imaged on the imaging surface S11.
Table 7 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens group of embodiment 3, wherein the unit of the radius of curvature and the thickness are both millimeters (mm).
Figure BDA0001592758330000141
Figure BDA0001592758330000151
TABLE 7
As is clear from table 7, in example 3, both the object-side surface and the image-side surface of any one of the first lens element E1 through the fourth lens element E4 are aspheric. Table 8 shows high-order term coefficients that can be used for each aspherical mirror surface in example 3, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.
Flour mark A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 -8.9112E-02 1.6183E+00 -2.4532E+01 2.0811E+02 -1.0748E+03 3.4260E+03 -6.5893E+03 7.0091E+03 -3.1684E+03
S2 3.1128E-01 -2.4622E+00 2.1436E+01 -1.5149E+02 7.0188E+02 -2.0763E+03 3.7571E+03 -3.7899E+03 1.6316E+03
S3 -3.8516E-01 1.9509E+00 -2.2787E+01 1.4172E+02 -5.6282E+02 1.3976E+03 -2.1188E+03 1.7841E+03 -6.2818E+02
S4 -2.6864E-01 -1.5681E-01 3.4067E+00 -2.5219E+01 9.2767E+01 -1.9736E+02 2.4503E+02 -1.6357E+02 4.5497E+01
S5 -1.6547E-01 7.1385E-01 -3.4512E+00 1.0843E+01 -2.0551E+01 2.6224E+01 -2.1515E+01 9.9417E+00 -1.9373E+00
S6 -6.7581E-01 1.6459E+00 -3.5251E+00 4.9706E+00 -4.3282E+00 2.5948E+00 -1.1490E+00 3.3924E-01 -4.7004E-02
S7 -1.2931E-01 -8.7210E-02 1.2405E-01 3.0278E-03 -9.1756E-02 6.8460E-02 -2.2957E-02 3.7835E-03 -2.4967E-04
S8 -1.1989E-01 5.7637E-02 -3.4953E-02 2.5280E-02 -1.4494E-02 4.8890E-03 -8.9978E-04 7.9876E-05 -2.2647E-06
TABLE 8
Table 9 gives the effective focal lengths f1 to f7 of the respective lenses, the total effective focal length f of the image pickup lens group, the total optical length TT L, half ImgH of the diagonal length of the effective pixel region on the imaging plane S11, and the maximum half field angle HFOV in embodiment 3.
f1(mm) 4.01 f(mm) 2.54
f2(mm) 20.34 TTL(mm) 3.77
f3(mm) 1.07 ImgH(mm) 2.74
f4(mm) -1.19 HFOV(°) 46.6
TABLE 9
Fig. 6A shows a chromatic aberration curve on the axis of the image-taking lens group of embodiment 3, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the lens. Fig. 6B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the image pickup lens group of embodiment 3. Fig. 6C shows a distortion curve of the image capturing lens group of embodiment 3, which represents the distortion magnitude values in the case of different angles of view. Fig. 6D shows a chromatic aberration of magnification curve of the imaging lens group of embodiment 3, which represents a deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 6A to 6D, the image capturing lens assembly of embodiment 3 can achieve good image quality.
Example 4
A photographing lens group according to embodiment 4 of the present application is described below with reference to fig. 7 to 8D. Fig. 7 shows a schematic configuration diagram of a photographing lens group according to embodiment 4 of the present application.
As shown in fig. 7, the image capturing lens assembly according to the exemplary embodiment of the present application, in order from an object side to an image side, comprises: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a filter E5, and an image plane S11.
The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a concave object-side surface S3 and a convex image-side surface S4. The third lens element E3 has positive power, and has a concave object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative power, and has a convex object-side surface S7 and a concave image-side surface S8. Filter E5 has an object side S9 and an image side S10, which may be an infrared bandpass filter having a bandpass band of about 750nm to about 1000nm, and further having a bandpass band of about 850nm to about 940 nm. The light from the object sequentially passes through the respective surfaces S1 to S10 and is finally imaged on the imaging surface S11.
Table 10 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens group of embodiment 4, wherein the unit of the radius of curvature and the thickness are both in millimeters (mm).
Figure BDA0001592758330000161
Figure BDA0001592758330000171
Watch 10
As can be seen from table 10, in example 4, both the object-side surface and the image-side surface of any one of the first lens element E1 through the fourth lens element E4 are aspheric. Table 11 shows high-order term coefficients that can be used for each aspherical mirror surface in embodiment 4, wherein each aspherical mirror surface type can be defined by the formula (1) given in embodiment 1 above.
Flour mark A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 -6.2770E-02 9.0623E-01 -1.4991E+01 1.3703E+02 -7.6901E+02 2.6745E+03 -5.6289E+03 6.5625E+03 -3.2539E+03
S2 2.9818E-01 -1.8227E+00 1.0839E+01 -5.6352E+01 1.8483E+02 -3.3666E+02 2.1540E+02 2.0341E+02 -2.8104E+02
S3 -4.5060E-01 3.5107E+00 -4.5067E+01 3.2096E+02 -1.4377E+03 4.0266E+03 -6.8664E+03 6.4989E+03 -2.6011E+03
S4 -2.6230E-01 -1.5619E-01 3.4017E+00 -2.6925E+01 1.0409E+02 -2.3076E+02 2.9702E+02 -2.0532E+02 5.9266E+01
S5 -1.4699E-01 5.9134E-01 -2.8627E+00 8.6061E+00 -1.4437E+01 1.6168E+01 -1.2184E+01 5.4127E+00 -1.0390E+00
S6 -6.2942E-01 1.3293E+00 -2.3211E+00 2.0241E+00 2.5753E-01 -1.7673E+00 1.2912E+00 -3.9839E-01 4.6147E-02
S7 -1.1326E-01 -1.7182E-01 2.7725E-01 -1.4820E-01 1.7489E-03 3.1035E-02 -1.3499E-02 2.4119E-03 -1.6291E-04
S8 -1.1761E-01 3.8211E-02 -7.0653E-03 4.1954E-03 -4.8098E-03 2.1222E-03 -4.2355E-04 3.4682E-05 -4.1572E-07
TABLE 11
Table 12 gives the effective focal lengths f1 to f7 of the respective lenses, the total effective focal length f of the image pickup lens group, the total optical length TT L, half ImgH of the diagonal length of the effective pixel region on the imaging plane S11, and the maximum half field angle HFOV in embodiment 4.
f1(mm) 3.95 f(mm) 2.54
f2(mm) 21.35 TTL(mm) 3.73
f3(mm) 1.06 ImgH(mm) 2.74
f4(mm) -1.18 HFOV(°) 47.1
TABLE 12
Fig. 8A shows a on-axis chromatic aberration curve of the image-taking lens group of embodiment 4, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the lens. Fig. 8B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the image pickup lens group of embodiment 4. Fig. 8C shows a distortion curve of the image capturing lens group of embodiment 4, which represents the distortion magnitude values in the case of different angles of view. Fig. 8D shows a chromatic aberration of magnification curve of the imaging lens group of embodiment 4, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 8A to 8D, the imaging lens assembly according to embodiment 4 can achieve good imaging quality.
Example 5
A photographing lens group according to embodiment 5 of the present application is described below with reference to fig. 9 to 10D. Fig. 9 shows a schematic configuration diagram of a photographing lens group according to embodiment 5 of the present application.
As shown in fig. 9, the image capturing lens assembly according to the exemplary embodiment of the present application, in order from an object side to an image side, comprises: a stop STO, a first lens E1, a second lens E2, a third lens E3, a fourth lens E4, a filter E5, and an image plane S11.
The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a concave object-side surface S3 and a convex image-side surface S4. The third lens element E3 has positive power, and has a concave object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative power, and has a convex object-side surface S7 and a concave image-side surface S8. Filter E5 has an object side S9 and an image side S10, which may be an infrared bandpass filter having a bandpass band of about 750nm to about 1000nm, and further having a bandpass band of about 850nm to about 940 nm. The light from the object sequentially passes through the respective surfaces S1 to S10 and is finally imaged on the imaging surface S11.
Table 13 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens group of example 5, wherein the unit of the radius of curvature and the thickness are both in millimeters (mm).
Figure BDA0001592758330000181
Watch 13
As is clear from table 13, in example 5, both the object-side surface and the image-side surface of any one of the first lens element E1 through the fourth lens element E4 are aspheric. Table 14 shows high-order term coefficients that can be used for each aspherical mirror surface in example 5, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.
Flour mark A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 -1.1115E-01 2.2518E+00 -3.3985E+01 2.9314E+02 -1.5508E+03 5.0913E+03 -1.0120E+04 1.1148E+04 -5.2238E+03
S2 2.7273E-01 -1.9439E+00 1.5580E+01 -1.0578E+02 4.7452E+02 -1.3681E+03 2.4235E+03 -2.4048E+03 1.0236E+03
S3 -4.2952E-01 2.4951E+00 -2.9161E+01 1.8433E+02 -7.4536E+02 1.9007E+03 -2.9991E+03 2.6840E+03 -1.0338E+03
S4 -2.7980E-01 -4.4434E-01 6.8845E+00 -4.6599E+01 1.6307E+02 -3.3541E+02 4.0722E+02 -2.6766E+02 7.3370E+01
S5 -1.6193E-01 7.4205E-01 -3.3627E+00 1.2258E+01 -3.2711E+01 5.8892E+01 -6.2491E+01 3.4815E+01 -7.8633E+00
S6 -7.5552E-01 2.2343E+00 -5.1617E+00 7.7309E+00 -6.6612E+00 3.1341E+00 -6.6583E-01 -4.0294E-04 1.5703E-02
S7 -1.2328E-01 -1.0808E-01 1.8831E-01 -9.3424E-02 -1.0629E-02 2.8188E-02 -1.1243E-02 1.9350E-03 -1.2738E-04
S8 -1.3966E-01 1.0047E-01 -8.9701E-02 7.1560E-02 -4.0224E-02 1.4101E-02 -2.9263E-03 3.2686E-04 -1.4908E-05
TABLE 14
Table 15 gives the effective focal lengths f1 to f7 of the respective lenses, the total effective focal length f of the image pickup lens group, the total optical length TT L, half ImgH of the diagonal length of the effective pixel region on the imaging plane S11, and the maximum half field angle HFOV in embodiment 5.
f1(mm) 3.80 f(mm) 2.53
f2(mm) 35.00 TTL(mm) 3.78
f3(mm) 1.06 ImgH(mm) 2.74
f4(mm) -1.18 HFOV(°) 47.1
Watch 15
Fig. 10A shows a on-axis chromatic aberration curve of the image-taking lens group of embodiment 5, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the lens. Fig. 10B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the image pickup lens group of embodiment 5. Fig. 10C shows a distortion curve of the image capturing lens group of embodiment 5, which represents the distortion magnitude values in the case of different angles of view. Fig. 10D shows a chromatic aberration of magnification curve of the imaging lens group of embodiment 5, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 10A to 10D, the imaging lens assembly according to embodiment 5 can achieve good imaging quality.
Example 6
A photographing lens group according to embodiment 6 of the present application is described below with reference to fig. 11 to 12D. Fig. 11 shows a schematic configuration diagram of a photographing lens group according to embodiment 6 of the present application.
As shown in fig. 11, the image capturing lens assembly according to the exemplary embodiment of the present application, in order from an object side to an image side, comprises: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a filter E5, and an image plane S11.
The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a concave object-side surface S3 and a convex image-side surface S4. The third lens element E3 has positive power, and has a concave object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative power, and has a convex object-side surface S7 and a concave image-side surface S8. Filter E5 has an object side S9 and an image side S10, which may be an infrared bandpass filter having a bandpass band of about 750nm to about 1000nm, and further having a bandpass band of about 850nm to about 940 nm. The light from the object sequentially passes through the respective surfaces S1 to S10 and is finally imaged on the imaging surface S11.
Table 16 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens group of example 6, wherein the unit of the radius of curvature and the thickness are both in millimeters (mm).
Figure BDA0001592758330000201
TABLE 16
As is clear from table 16, in example 6, both the object-side surface and the image-side surface of any one of the first lens element E1 through the fourth lens element E4 are aspheric. Table 17 shows high-order term coefficients that can be used for each aspherical mirror surface in example 6, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.
Flour mark A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 -3.2793E-02 3.5898E-01 -3.4443E+00 1.8386E+01 -6.3728E+01 1.4168E+02 -1.9564E+02 1.5195E+02 -5.0525E+01
S2 -2.4794E-02 -7.9404E-01 8.1321E+00 -5.4983E+01 2.2496E+02 -5.6335E+02 8.2934E+02 -6.4403E+02 1.9685E+02
S3 -2.0247E-01 3.5605E-01 -4.7352E+00 2.7314E+01 -1.0376E+02 2.5261E+02 -3.8873E+02 3.4447E+02 -1.3179E+02
S4 -3.1979E-02 -1.0312E+00 4.2004E+00 -1.1514E+01 2.0302E+01 -2.3178E+01 1.6342E+01 -6.1557E+00 8.7784E-01
S5 -1.6273E-01 -6.6005E-01 1.2266E+00 1.9718E+00 -9.7598E+00 1.5882E+01 -1.3298E+01 5.7107E+00 -9.9874E-01
S6 -2.2475E-01 -3.2601E-01 1.8038E+00 -4.2747E+00 6.3665E+00 -5.6032E+00 2.7827E+00 -7.0638E-01 6.8282E-02
S7 -3.4430E-01 2.6698E-01 -1.7721E-01 8.2155E-02 -2.7280E-02 6.5801E-03 -1.0834E-03 1.0600E-04 -4.5643E-06
S8 -1.2507E-01 9.7701E-02 -5.8730E-02 2.4195E-02 -7.0227E-03 1.4222E-03 -1.9122E-04 1.5346E-05 -5.5509E-07
TABLE 17
Table 18 gives the effective focal lengths f1 to f7 of the respective lenses, the total effective focal length f of the image pickup lens group, the total optical length TT L, half ImgH of the diagonal length of the effective pixel region on the imaging plane S11, and the maximum half field angle HFOV in embodiment 6.
f1(mm) 4.21 f(mm) 2.52
f2(mm) 19.55 TTL(mm) 4.14
f3(mm) 6.43 ImgH(mm) 2.73
f4(mm) -523.41 HFOV(°) 47.2
Watch 18
Fig. 12A shows a on-axis chromatic aberration curve of the image-taking lens group of embodiment 6, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the lens. Fig. 12B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the image pickup lens group of embodiment 6. Fig. 12C shows a distortion curve of the image capturing lens group of embodiment 6, which represents the distortion magnitude values in the case of different angles of view. Fig. 12D shows a chromatic aberration of magnification curve of the imaging lens group of embodiment 6, which represents a deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 12A to 12D, the imaging lens assembly according to embodiment 6 can achieve good imaging quality.
Example 7
A photographing lens group according to embodiment 7 of the present application is described below with reference to fig. 13 to 14D. Fig. 13 shows a schematic configuration diagram of an image capturing lens group according to embodiment 7 of the present application.
As shown in fig. 13, the image capturing lens assembly according to the exemplary embodiment of the present application, in order from an object side to an image side, comprises: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a filter E5, and an image plane S11.
The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a concave object-side surface S3 and a convex image-side surface S4. The third lens element E3 has positive power, and has a concave object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative power, and has a convex object-side surface S7 and a concave image-side surface S8. Filter E5 has an object side S9 and an image side S10, which may be an infrared bandpass filter having a bandpass band of about 750nm to about 1000nm, and further having a bandpass band of about 850nm to about 940 nm. The light from the object sequentially passes through the respective surfaces S1 to S10 and is finally imaged on the imaging surface S11.
Table 19 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens group of example 7, wherein the unit of the radius of curvature and the thickness are both in millimeters (mm).
Figure BDA0001592758330000221
Watch 19
As is clear from table 19, in example 7, both the object-side surface and the image-side surface of any one of the first lens element E1 through the fourth lens element E4 are aspheric. Table 20 shows high-order term coefficients that can be used for each aspherical mirror surface in example 7, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.
Flour mark A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 -4.8247E-02 6.1393E-01 -5.7233E+00 3.2323E+01 -1.1901E+02 2.8173E+02 -4.1257E+02 3.3875E+02 -1.1898E+02
S2 -8.4915E-03 -1.1036E+00 1.4559E+01 -1.2475E+02 6.7138E+02 -2.2845E+03 4.7555E+03 -5.5193E+03 2.7340E+03
S3 -1.7050E-01 -3.3672E-01 2.5642E+00 -1.8907E+01 7.8599E+01 -2.0285E+02 3.1485E+02 -2.7287E+02 1.0292E+02
S4 -6.3042E-02 -4.0936E-01 9.2622E-01 -1.0795E+00 -1.2941E+00 5.8799E+00 -8.0382E+00 5.0836E+00 -1.2108E+00
S5 -1.2111E-01 -3.1913E-01 2.8056E-01 6.7134E-01 -1.0607E+00 3.8297E-01 2.4393E-01 -2.3016E-01 5.0858E-02
S6 -1.6386E-01 -1.0787E-01 3.2168E-01 -2.2412E-01 -4.7411E-01 1.3375E+00 -1.2519E+00 5.2198E-01 -8.2226E-02
S7 -3.2093E-01 1.6715E-01 -6.2803E-02 1.6327E-02 -5.7958E-03 2.6158E-03 -7.5017E-04 1.1023E-04 -6.4704E-06
S8 -1.1047E-01 4.8586E-02 -7.0328E-03 -5.2173E-03 3.2807E-03 -8.9715E-04 1.3920E-04 -1.2043E-05 4.5604E-07
Watch 20
Table 21 gives the effective focal lengths f1 to f7 of the respective lenses, the total effective focal length f of the image pickup lens group, the total optical length TT L, half ImgH of the diagonal length of the effective pixel region on the imaging plane S11, and the maximum half field angle HFOV in embodiment 7.
f1(mm) 4.79 f(mm) 2.53
f2(mm) 14.92 TTL(mm) 4.13
f3(mm) 5.48 ImgH(mm) 2.73
f4(mm) -80.00 HFOV(°) 47.1
TABLE 21
Fig. 14A shows a on-axis chromatic aberration curve of the image-taking lens group of embodiment 7, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the lens. Fig. 14B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the image pickup lens group of embodiment 7. Fig. 14C shows a distortion curve of the image capturing lens group of embodiment 7, which represents the distortion magnitude values in the case of different angles of view. Fig. 14D shows a chromatic aberration of magnification curve of the imaging lens group of embodiment 7, which represents a deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 14A to 14D, the imaging lens assembly according to embodiment 7 can achieve good imaging quality.
Example 8
A photographing lens group according to embodiment 8 of the present application is described below with reference to fig. 15 to 16D. Fig. 15 shows a schematic structural view of a photographing lens group according to embodiment 8 of the present application.
As shown in fig. 15, the image capturing lens assembly according to the exemplary embodiment of the present application, in order from an object side to an image side, comprises: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a filter E5, and an image plane S11.
The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a concave object-side surface S3 and a convex image-side surface S4. The third lens element E3 has positive power, and has a concave object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative power, and has a convex object-side surface S7 and a concave image-side surface S8. Filter E5 has an object side S9 and an image side S10, which may be an infrared bandpass filter having a bandpass band of about 750nm to about 1000nm, and further having a bandpass band of about 850nm to about 940 nm. The light from the object sequentially passes through the respective surfaces S1 to S10 and is finally imaged on the imaging surface S11.
Table 22 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens group of example 8, wherein the unit of the radius of curvature and the thickness are both in millimeters (mm).
Figure BDA0001592758330000241
TABLE 22
As can be seen from table 22, in example 8, both the object-side surface and the image-side surface of any one of the first lens element E1 through the fourth lens element E4 are aspheric. Table 23 shows high-order term coefficients that can be used for each aspherical mirror surface in embodiment 8, wherein each aspherical mirror surface type can be defined by the formula (1) given in embodiment 1 above.
Figure BDA0001592758330000242
Figure BDA0001592758330000251
TABLE 23
Table 24 gives the effective focal lengths f1 to f7 of the respective lenses, the total effective focal length f of the image pickup lens group, the total optical length TT L, half ImgH of the diagonal length of the effective pixel region on the imaging plane S11, and the maximum half field angle HFOV in embodiment 8.
f1(mm) 4.72 f(mm) 2.53
f2(mm) 17.07 TTL(mm) 4.14
f3(mm) 4.72 ImgH(mm) 2.73
f4(mm) -25.69 HFOV(°) 47.1
Watch 24
Fig. 16A shows a on-axis chromatic aberration curve of the image-taking lens group of embodiment 8, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the lens. Fig. 16B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the image pickup lens group of embodiment 8. Fig. 16C shows a distortion curve of the image capturing lens group of embodiment 8, which represents the distortion magnitude values in the case of different angles of view. Fig. 16D shows a chromatic aberration of magnification curve of the imaging lens group of embodiment 8, which represents a deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 16A to 16D, the image capturing lens assembly according to embodiment 8 can achieve good image quality.
Example 9
A photographing lens group according to embodiment 9 of the present application is described below with reference to fig. 17 to 18D. Fig. 17 shows a schematic configuration diagram of an image capturing lens group according to embodiment 9 of the present application.
As shown in fig. 17, the image capturing lens assembly according to the exemplary embodiment of the present application, in order from an object side to an image side, comprises: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a filter E5, and an image plane S11.
The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a concave object-side surface S3 and a convex image-side surface S4. The third lens element E3 has positive power, and has a concave object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative power, and has a convex object-side surface S7 and a concave image-side surface S8. Filter E5 has an object side S9 and an image side S10, which may be an infrared bandpass filter having a bandpass band of about 750nm to about 1000nm, and further having a bandpass band of about 850nm to about 940 nm. The light from the object sequentially passes through the respective surfaces S1 to S10 and is finally imaged on the imaging surface S11.
Table 25 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens group of example 9, wherein the unit of the radius of curvature and the thickness are both in millimeters (mm).
Figure BDA0001592758330000261
TABLE 25
As is clear from table 25, in example 9, both the object-side surface and the image-side surface of any one of the first lens element E1 through the fourth lens element E4 are aspheric. Table 26 shows high-order term coefficients that can be used for each aspherical mirror surface in example 9, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.
Figure BDA0001592758330000262
Figure BDA0001592758330000271
Watch 26
Table 27 gives the effective focal lengths f1 to f7 of the respective lenses, the total effective focal length f of the image pickup lens group, the total optical length TT L, half ImgH of the diagonal length of the effective pixel region on the imaging plane S11, and the maximum half field angle HFOV in embodiment 9.
f1(mm) 4.42 f(mm) 2.52
f2(mm) 19.05 TTL(mm) 4.17
f3(mm) 5.46 ImgH(mm) 2.73
f4(mm) -49.85 HFOV(°) 47.0
Watch 27
Fig. 18A shows a chromatic aberration curve on the axis of the image-taking lens group of embodiment 9, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the lens. Fig. 18B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the image pickup lens group of embodiment 9. Fig. 18C shows a distortion curve of the image capturing lens group of embodiment 9, which represents the distortion magnitude values in the case of different angles of view. Fig. 18D shows a chromatic aberration of magnification curve of the imaging lens group of embodiment 9, which represents a deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 18A to 18D, the imaging lens assembly according to embodiment 9 can achieve good imaging quality.
Example 10
A photographing lens group according to embodiment 10 of the present application is described below with reference to fig. 19 to 20D. Fig. 19 shows a schematic configuration diagram of a photographing lens group according to embodiment 10 of the present application.
As shown in fig. 19, the image capturing lens assembly according to the exemplary embodiment of the present application, in order from an object side to an image side, comprises: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a filter E5, and an image plane S11.
The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a concave object-side surface S3 and a convex image-side surface S4. The third lens element E3 has positive power, and has a concave object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative power, and has a convex object-side surface S7 and a concave image-side surface S8. Filter E5 has an object side S9 and an image side S10, which may be an infrared bandpass filter having a bandpass band of about 750nm to about 1000nm, and further having a bandpass band of about 850nm to about 940 nm. The light from the object sequentially passes through the respective surfaces S1 to S10 and is finally imaged on the imaging surface S11.
Table 28 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens group of example 10, wherein the unit of the radius of curvature and the thickness are both in millimeters (mm).
Figure BDA0001592758330000281
Watch 28
As can be seen from table 28, in example 10, both the object-side surface and the image-side surface of any one of the first lens element E1 through the fourth lens element E4 are aspheric. Table 29 shows high-order term coefficients that can be used for each aspherical mirror surface in example 10, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.
Flour mark A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 -2.7574E-02 4.1491E-01 -4.4556E+00 2.8485E+01 -1.1816E+02 3.1166E+02 -5.0239E+02 4.4874E+02 -1.6973E+02
S2 -3.5646E-03 -1.2012E+00 1.7545E+01 -1.6402E+02 9.5657E+02 -3.5127E+03 7.8675E+03 -9.8033E+03 5.2055E+03
S3 -2.1336E-01 6.3652E-01 -5.7222E+00 2.3204E+01 -4.8465E+01 1.2322E+01 1.4662E+02 -2.7287E+02 1.5955E+02
S4 -4.4429E-02 -7.3559E-01 2.5061E+00 -6.7075E+00 1.2299E+01 -1.5266E+01 1.2532E+01 -6.0792E+00 1.3014E+00
S5 -1.7243E-01 -5.0618E-01 8.9557E-01 6.4405E-02 -1.7146E+00 3.7505E+00 -4.2784E+00 2.3817E+00 -5.1130E-01
S6 -1.7401E-01 -3.9691E-01 1.8787E+00 -4.5990E+00 7.0009E+00 -6.3321E+00 3.3383E+00 -9.5114E-01 1.1315E-01
S7 -3.2250E-01 1.9319E-01 -1.1092E-01 5.6980E-02 -2.7270E-02 1.0111E-02 -2.3666E-03 3.0042E-04 -1.5705E-05
S8 -5.0765E-02 -1.4892E-02 3.7492E-02 -2.8452E-02 1.2096E-02 -3.1948E-03 5.2247E-04 -4.8329E-05 1.9205E-06
Watch 29
Table 30 gives the effective focal lengths f1 to f7 of the respective lenses, the total effective focal length f of the image pickup lens group, the total optical length TT L, half ImgH of the diagonal length of the effective pixel region on the imaging plane S11, and the maximum half field angle HFOV in embodiment 10.
f1(mm) 4.36 f(mm) 2.51
f2(mm) 13.16 TTL(mm) 4.16
f3(mm) 6.39 ImgH(mm) 2.73
f4(mm) -210.31 HFOV(°) 47.1
Watch 30
Fig. 20A shows a on-axis chromatic aberration curve of the image-taking lens group of embodiment 10, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the lens. Fig. 20B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the image pickup lens group of embodiment 10. Fig. 20C shows a distortion curve of the image capturing lens group of embodiment 10, which represents the distortion magnitude values in the case of different angles of view. Fig. 20D shows a chromatic aberration of magnification curve of the imaging lens group of embodiment 10, which represents the deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 20A to 20D, the imaging lens assembly according to embodiment 10 can achieve good imaging quality.
Example 11
A photographing lens group according to embodiment 11 of the present application is described below with reference to fig. 21 to 22D. Fig. 21 is a schematic view showing the structure of a photographing lens group according to embodiment 11 of the present application.
As shown in fig. 21, the image capturing lens assembly according to the exemplary embodiment of the present application, in order from an object side to an image side, comprises: a first lens E1, a stop STO, a second lens E2, a third lens E3, a fourth lens E4, a filter E5, and an image plane S11.
The first lens element E1 has positive power, and has a convex object-side surface S1 and a concave image-side surface S2. The second lens element E2 has positive power, and has a concave object-side surface S3 and a convex image-side surface S4. The third lens element E3 has positive power, and has a concave object-side surface S5 and a convex image-side surface S6. The fourth lens element E4 has negative power, and has a convex object-side surface S7 and a concave image-side surface S8. Filter E5 has an object side S9 and an image side S10, which may be an infrared bandpass filter having a bandpass band of about 750nm to about 1000nm, and further having a bandpass band of about 850nm to about 940 nm. The light from the object sequentially passes through the respective surfaces S1 to S10 and is finally imaged on the imaging surface S11.
Table 31 shows the surface type, radius of curvature, thickness, material, and conic coefficient of each lens of the imaging lens group of example 11, wherein the unit of the radius of curvature and the thickness are both in millimeters (mm).
Figure BDA0001592758330000301
Watch 31
As can be seen from table 31, in example 11, both the object-side surface and the image-side surface of any one of the first lens element E1 through the fourth lens element E4 are aspheric. Table 32 shows high-order term coefficients that can be used for each aspherical mirror surface in example 11, wherein each aspherical mirror surface type can be defined by formula (1) given in example 1 above.
Flour mark A4 A6 A8 A10 A12 A14 A16 A18 A20
S1 -8.9961E-03 4.1990E-01 -7.2311E+00 5.7494E+01 -2.6526E+02 7.3782E+02 -1.2201E+03 1.1029E+03 -4.1958E+02
S2 2.1636E-02 -3.3398E+00 6.4708E+01 -6.9572E+02 4.4493E+03 -1.7416E+04 4.0904E+04 -5.2902E+04 2.8948E+04
S3 6.2880E-03 -4.7733E+00 5.0772E+01 -3.2177E+02 1.2572E+03 -3.0825E+03 4.6123E+03 -3.8620E+03 1.3960E+03
S4 -1.2398E-01 -1.6224E-01 -5.6476E-01 4.0547E+00 -1.2947E+01 2.2942E+01 -2.2686E+01 1.1791E+01 -2.5166E+00
S5 -1.6783E-01 -7.7129E-01 3.6421E+00 -1.1668E+01 2.5115E+01 -3.2004E+01 2.3573E+01 -9.3755E+00 1.5665E+00
S6 -1.8434E-01 -4.6003E-01 2.7120E+00 -7.9851E+00 1.3901E+01 -1.4133E+01 8.3090E+00 -2.6251E+00 3.4511E-01
S7 -2.5352E-01 1.3562E-01 -6.3150E-02 2.3281E-02 -9.5878E-03 3.7496E-03 -9.3122E-04 1.2080E-04 -6.2745E-06
S8 -7.0498E-02 5.5718E-02 -3.4770E-02 1.2482E-02 -2.2992E-03 4.2846E-05 6.6106E-05 -1.1436E-05 6.1322E-07
Watch 32
Table 33 gives the effective focal lengths f1 to f7 of the respective lenses, the total effective focal length f of the image pickup lens group, the total optical length TT L, half ImgH of the diagonal length of the effective pixel region on the imaging plane S11, and the maximum half field angle HFOV in embodiment 11.
f1(mm) 4.61 f(mm) 2.38
f2(mm) 26.37 TTL(mm) 4.16
f3(mm) 4.32 ImgH(mm) 2.73
f4(mm) -85.42 HFOV(°) 48.8
Watch 33
Fig. 22A shows a chromatic aberration curve on the axis of the image-taking lens group of embodiment 11, which represents the deviation of the convergent focus of light rays of different wavelengths after passing through the lens. Fig. 22B shows an astigmatism curve representing meridional field curvature and sagittal field curvature of the image pickup lens group of embodiment 11. Fig. 22C shows a distortion curve of the image capturing lens group of embodiment 11, which represents the distortion magnitude values in the case of different angles of view. Fig. 22D shows a chromatic aberration of magnification curve of the imaging lens group of embodiment 11, which represents a deviation of different image heights on the imaging plane after light passes through the lens. As can be seen from fig. 22A to 22D, the imaging lens assembly according to embodiment 11 can achieve good imaging quality.
In summary, examples 1 to 11 satisfy the relationship shown in table 34, respectively.
Conditional expression (A) example 1 2 3 4 5 6 7 8 9 10 11
|f2/R5| 8.13 10.14 13.53 14.29 23.47 20.74 14.10 15.12 18.03 14.19 27.59
HFOV(°) 47.0 47.1 46.6 47.1 47.1 47.2 47.1 47.1 47.0 47.1 48.8
f/EPD 1.95 1.95 1.95 1.96 1.95 1.95 1.90 1.95 1.95 1.95 1.95
TTL/ImgH 1.40 1.39 1.37 1.36 1.38 1.52 1.51 1.52 1.53 1.52 1.52
f/R1 1.79 1.82 1.86 1.88 1.89 1.26 1.26 1.29 1.29 1.26 1.13
f/f2 0.21 0.17 0.12 0.12 0.07 0.13 0.17 0.15 0.13 0.19 0.09
|R3/R4| 2.18 2.40 2.47 2.61 1.69 1.48 2.80 2.64 1.54 1.83 1.38
f23/(CT4+CT3) 1.17 1.12 1.10 1.10 0.88 4.50 3.90 3.46 3.91 4.08 3.36
T34/T23 0.08 0.08 0.08 0.08 0.12 0.12 0.08 0.09 0.10 0.14 0.18
∑AT/TTL 0.19 0.18 0.19 0.19 0.16 0.18 0.20 0.20 0.18 0.16 0.15
Watch 34
The present application also provides an image pickup apparatus, wherein the electronic photosensitive element may be a photosensitive coupling element (CCD) or a Complementary Metal Oxide Semiconductor (CMOS). The camera device may be a stand-alone camera device such as a digital camera, or may be a camera module integrated on a mobile electronic device such as a mobile phone. The image pickup device is equipped with the image pickup lens group described above.
The above description is only a preferred embodiment of the application and is illustrative of the principles of the technology employed. It will be appreciated by a person skilled in the art that the scope of the invention as referred to in the present application is not limited to the embodiments with a specific combination of the above-mentioned features, but also covers other embodiments with any combination of the above-mentioned features or their equivalents without departing from the inventive concept. For example, the above features may be replaced with (but not limited to) features having similar functions disclosed in the present application.

Claims (11)

1. The image capturing lens assembly includes four lens elements having respective refractive powers, namely a first lens element, a second lens element, a third lens element and a fourth lens element, the first lens element to the fourth lens element being arranged in order from an object side to an image side along an optical axis,
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;
the third lens has positive focal power, the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a convex surface;
the fourth lens has a negative optical power;
at least one of the object side surface of the first lens and the image side surface of the fourth lens is an aspheric mirror surface;
the maximum half field angle HFOV of the camera lens group meets the requirement that the HFOV is more than 45 degrees and less than 50 degrees; and
the effective focal length f2 of the second lens and the curvature radius R5 of the object side surface of the third lens meet 8 ≦ f2/R5 ≦ 28.
2. The imaging lens group of claim 1, wherein the total effective focal length f of the imaging lens group and the radius of curvature R1 of the object side surface of the first lens satisfy 1 < f/R1 < 2.
3. The imaging lens group of claim 1, wherein the total effective focal length f of the imaging lens group and the effective focal length f2 of the second lens satisfy 0 < f/f2 < 0.25.
4. The imaging lens group of claim 1, wherein the radius of curvature R3 of the object-side surface of the second lens and the radius of curvature R4 of the image-side surface of the second lens satisfy 1 < | R3/R4| < 3.
5. The imaging lens group according to claim 1, wherein a combined focal length f23 of the second lens and the third lens, a central thickness CT3 of the third lens on the optical axis and a central thickness CT4 of the fourth lens on the optical axis satisfy 0.50 < f23/(CT4+ CT3) ≦ 4.50.
6. The imaging lens group according to claim 1, wherein a separation distance T34 on the optical axis between the third lens and the fourth lens and a separation distance T23 on the optical axis between the second lens and the third lens satisfy T34/T23 < 0.2.
7. The imaging lens group according to any one of claims 1 to 6, further comprising an infrared band pass filter disposed between the fourth lens and an imaging surface of the imaging lens group, the infrared band pass filter having a band pass band of 750nm to 1000 nm.
8. The camera lens group according to claim 7, wherein the band pass band of the infrared band pass filter is 850nm to 940 nm.
9. The imaging lens group according to any of claims 1 to 6, characterized in that the total effective focal length f of the imaging lens group and the entrance pupil diameter EPD of the imaging lens group satisfy f/EPD ≦ 2.0.
10. The imaging lens group of any one of claims 1 to 6, wherein a distance TT L from the center of the object side surface of the first lens to the imaging surface of the imaging lens group on the optical axis and a half ImgH of a diagonal length of an effective pixel area on the imaging surface of the imaging lens group satisfy TT L/ImgH < 1.6.
11. The image capturing lens group according to any one of claims 1 to 6, wherein a sum ∑ AT of distances of separation on the optical axis of any adjacent two of the first to fourth lenses and a distance TT L on the optical axis from a center of an object side surface of the first lens to an image plane of the image capturing lens group satisfy 0.15 ≦ ∑ AT/TT L < 0.25.
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