Imaging lens group

Abstract

The invention provides an imaging lens group. The imaging lens group comprises a lens barrel, a lens group and a spacing element group, the lens group is composed of five lenses, and the five lenses are a first lens, a second lens, a third lens, a fourth lens and a fifth lens in sequence from the object side to the image side; the spacing element group comprises a second spacing element and a third spacing element; the formula is as follows:-2.8 lt; f2 / f3lt; -1.5,-1.5; 0 lt; f3 / R5lt; 0.3 part; the formula is as follows: 2.8 mmlt; d3 < m > / d < 3m > * EP < 23lt >; the thickness is 6.1 mm. The problem that stray light is serious due to the fact that a five-piece type imaging lens set in the prior art meets the telephoto requirement is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of optical imaging devices, and more particularly, to an imaging lens group. Background Art

[0002] With the continuous development of smart phones, the functions and shooting effects of the imaging lens groups mounted thereon have gradually become the key factors for users to select mobile phones.

[0003] Currently, taking a five-piece telephoto imaging lens group as an example, more and more users require that the five-piece telephoto imaging lens group on the mobile phone not only meets the function of long-distance photography but also takes into account high imaging quality while satisfying the function of long-distance photography. The imaging lens group has telephoto characteristics and can play its unique advantages whether it is used to photograph distant objects, achieve background blurring, take macro photos or create works with unique perspectives. However, in order to meet the telephoto function, the current five-piece telephoto imaging lens group often requires more lenses or a more complex structure in design, and a second lens with a positive focal power and a third lens with a negative focal power and a larger curvature radius on the object side are designed, which makes it easier for light to refract, reflect and scatter when transmitting in the imaging lens group, and it is easy to generate stray light inside the lens, thus affecting the imaging quality.

[0004] That is to say, the five-piece imaging lens group in the prior art has the problem that the stray light is serious due to meeting the telephoto requirements. Summary of the Invention

[0005] The main object of the present invention is to provide an imaging lens group to solve the problem that the five-piece imaging lens group in the prior art has serious stray light due to meeting the telephoto requirements.

[0006] To achieve the above object, according to one aspect of the present invention, there is provided an imaging lens group, including a lens barrel and a lens group and a spacer element group disposed in the lens barrel. The lens group is composed of five lenses. The five lenses are, in order from the object side to the image side, a first lens, a second lens, a third lens, a fourth lens and a fifth lens; the spacer element group includes a second spacer element disposed on the image side of the second lens and at least partially contacting the image side surface of the second lens and a third spacer element disposed on the image side of the third lens and at least partially contacting the image side surface of the third lens; the following relationships are satisfied between the effective focal length f2 of the second lens and the effective focal length f3 of the third lens: -2.8 < f2 / f3 < -1.5; the following relationship is satisfied between the effective focal length f3 of the third lens and the curvature radius R5 of the object side surface of the third lens: 0 < |f3 / R5| < 0.3; the following relationship is satisfied between the image side inner diameter d3m of the third spacer element, the image side outer diameter D3m of the third spacer element and the interval distance EP23 along the optical axis direction from the image side surface of the second spacer element to the object side surface of the third spacer element: 2.8 mm < D3m / d3m × EP23 < 6.1 mm.

[0007] According to another aspect of the present invention, there is provided an imaging lens group, including a lens barrel and a lens group and a spacer element group disposed in the lens barrel. The lens group is composed of five lenses. The five lenses are, in order from the object side to the image side, a first lens with a positive optical power, a second lens with a positive optical power, a third lens with a negative optical power, a fourth lens with a positive optical power, and a fifth lens with a negative optical power. The spacer element group includes a second spacer element disposed on the image side of the second lens and at least partially in contact with the image side surface of the second lens, and a third spacer element disposed on the image side of the third lens and at least partially in contact with the image side surface of the third lens. The following relationships are satisfied between the effective focal length f2 of the second lens and the effective focal length f3 of the third lens: -2.8 < f2 / f3 < -1.5. The following relationship is satisfied between the effective focal length f3 of the third lens and the radius of curvature R5 of the object side surface of the third lens: 0 < |f3 / R5| < 0.3. The following relationship is satisfied between the radius of curvature R3 of the object side surface of the second lens, the outer diameter D2s of the object side of the second spacer element, and the inner diameter d2s of the object side of the second spacer element: 0.5 < π×(D2s 2 -d2s 2 ) / R3 2 < 1.5.

[0008] According to another aspect of the present invention, there is provided an imaging lens group, including a lens barrel and a lens group and a spacer element group disposed in the lens barrel. The lens group is composed of five lenses. The five lenses are, in order from the object side to the image side, a first lens with a positive optical power, a second lens with a positive optical power, a third lens with a negative optical power, a fourth lens with a positive optical power, and a fifth lens with a negative optical power. The spacer element group includes a second spacer element disposed on the image side of the second lens and at least partially in contact with the image side surface of the second lens, a third spacer element disposed on the image side of the third lens and at least partially in contact with the image side surface of the third lens, and a fourth spacer element disposed on the image side of the fourth lens and partially abutting against the image side surface of the fourth lens. The following relationship is satisfied between the effective focal length f3 of the third lens and the inner diameter d3m of the image side of the third spacer element: -1.2 < f3 / d3m < -0.7. The following relationship is satisfied between the radius of curvature R7 of the object side surface of the fourth lens and the outer diameter D4s of the object side of the fourth spacer element: 1.8 < R7 / D4s < 30.5.

[0009] Furthermore, the following relationship is satisfied between the radius of curvature R3 of the object side surface of the second lens, the outer diameter D2s of the object side of the second spacer element, and the inner diameter d2s of the object side of the second spacer element: 0.5 < π×(D2s 2 -d2s 2 ) / R3 2 < 1.5.

[0010] Further, the spacer element group further includes a fourth spacer element disposed on the image side of the fourth lens and at least partially in contact with the image side surface of the fourth lens. The spacing distance EP34 along the optical axis direction from the image side surface of the third spacer element to the object side surface of the fourth spacer element satisfies: 0.6 < EP34 / CT4 ≤ 1.5 with respect to the central thickness CT4 of the fourth lens.

[0011] Further, the spacing distance EP23 along the optical axis direction from the image side surface of the second spacer element to the object side surface of the third spacer element satisfies: 1.5 < EP23 / CT3 < 2.0 with respect to the central thickness CT3 of the third lens.

[0012] Further, the effective focal length f of the imaging lens group, the entrance pupil diameter EPD of the imaging lens group, and the object side inner diameter d0s of the lens barrel satisfy: 19 mm < f / EPD × d0s < 24 mm.

[0013] Further, the spacer element group further includes a first spacer element disposed on the image side of the first lens and at least partially in contact with the image side surface of the first lens. The reflectivity of the first spacer element in the visible light band is less than 3%. The maximum axial thickness CP1 of the first spacer element, the image side inner diameter d1m of the first spacer element, and the object side inner diameter d1s of the first spacer element satisfy: 0 ≤ CP1 / (d1m + d1s) < 0.2.

[0014] Further, the maximum radial thickness M at the bearing position between the lens barrel and the fourth lens satisfies: 0.6 mm < M < 1.1 mm.

[0015] Further, the spacer element group further includes a fourth spacer element disposed on the image side of the fourth lens and at least partially in contact with the image side surface of the fourth lens. The axial distance SAG41 between the intersection point of the object side surface of the fourth lens and the optical axis and the effective radius vertex of the object side surface of the fourth lens satisfies: -58 < D4s / SAG41 < 42, and D4s / SAG41 ≠ 0 with respect to the object side outer diameter D4s of the fourth spacer element.

[0016] Further, the spacer element group further includes a first spacer element disposed on the image side of the first lens and at least partially in contact with the image side surface of the first lens. The curvature radius R2 of the image side surface of the first lens and the curvature radius R3 of the object side surface of the second lens satisfy: -60 < R2 / R3 < 8; the maximum axial thickness CP1 of the first spacer element and the air gap T12 between the first lens and the second lens on the optical axis satisfy: 0 ≤ CP1 / T12 < 1.6.

[0017] Further, the spacer element group further includes a fourth spacer element disposed on the image side of the fourth lens and at least partially in contact with the image side surface of the fourth lens. The refractive index N4 of the fourth lens, the curvature radius R7 of the object side surface of the fourth lens, the curvature radius R8 of the image side surface of the fourth lens, and the object side outer diameter D4s of the fourth spacer element satisfy: -471 mm < N4 × R7 / R8 × D4s < -32 mm.

[0018] Further, the first lens has a positive optical power, and its object side surface is convex; the second lens has a positive optical power, its object side surface is convex, and its image side surface is convex; the third lens has a negative optical power, and its image side surface is concave; the fourth lens has a positive optical power, its object side surface is convex, and its image side surface is convex; the fifth lens has a negative optical power, its object side surface is convex, and its image side surface is concave.

[0019] Applying the technical solution of the present invention, the imaging lens group of the present application is composed of a lens barrel and five lenses and multiple spacer elements disposed in the lens barrel. By reasonably arranging the positions of the five lenses and the second and third spacer elements and setting the imaging lens group to satisfy -2.8 < f2 / f3 < -1.5 and 0 < |f3 / R5| < 0.3, it is beneficial to adjust the focal length of the front lens to ensure the telephoto function. However, in this case, when light enters the imaging lens group, it is easy to refract or reflect at the edge of the structural member, resulting in a serious situation of stray light and affecting the imaging quality. Therefore, in the present application, by restricting 2.8 mm < D3m / d3m × EP23 < 6.1 mm, the trend of light incident on the third lens after exiting the second lens can be effectively controlled, and at the same time, the number and energy of light rays in the field of view are ensured, so that the third spacer element can absorb part of the light rays that may enter the edge flange structure of the lens, reduce stray light, and by controlling the interval distance along the optical axis direction from the image side surface of the second spacer element to the object side surface of the third spacer element, the edge thickness of the third lens can be prevented from being too thick, effectively weakening the energy of the stray light spot, and thus being beneficial to ensuring the imaging quality of the imaging lens group. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The specification drawings forming a part of the present application are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0021] Figure 1 Shows the dimension marking diagram of the imaging lens group of an optional embodiment of the present invention;

[0022] Figure 2 Shows the structural schematic diagram of the imaging lens group of Embodiment 1-1 of the present invention;

[0023] Figure 3 Shows the structural schematic diagram of the imaging lens group of Embodiment 1-2 of the present invention;

[0024] Figure 4 A schematic structural diagram of an imaging lens assembly according to embodiments 1 to 3 of the present invention is shown;

[0025] Figures 5 to 7 The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the imaging lens group of the first embodiment of the present invention are respectively shown;

[0026] Figure 8 A schematic structural diagram of an imaging lens group according to Embodiment 2-1 of the present invention is shown;

[0027] Fig. 9 A schematic structural diagram of an imaging lens group according to Embodiment 2-2 of the present invention is shown;

[0028] Fig.10 A schematic structural diagram of an imaging lens group according to Embodiment 2-3 of the present invention is shown;

[0029] Figures 11 to 13 The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the imaging lens group of the second embodiment of the present invention are respectively shown;

[0030] Fig.14 A schematic structural diagram of an imaging lens group according to Embodiment 3-1 of the present invention is shown;

[0031] Fig.15 A schematic structural diagram of an imaging lens group according to Embodiment 3-2 of the present invention is shown;

[0032] Fig.16 A schematic structural diagram of an imaging lens group according to Embodiment 3-3 of the present invention is shown;

[0033] Figures 17 to 19 The axial chromatic aberration curve, the astigmatism curve and the distortion curve of the imaging lens group of the third embodiment of the present invention are respectively shown;

[0034] Fig. 20 A stray light path diagram is shown when an imaging lens group of an optional embodiment of the present invention satisfies f2 / f3=-1.57, |f3 / R5|=0.24 and D3m / d3m×EP23=2.1mm;

[0035] Fig.21 A stray light path diagram is shown when an imaging lens group of an optional embodiment of the present invention satisfies f2 / f3=-1.57, |f3 / R5|=0.24 and D3m / d3m×EP23=6.5mm;

[0036] Fig. 22A stray light path diagram is shown when an imaging lens group of an optional embodiment of the present invention satisfies f2 / f3=-1.57, |f3 / R5|=0.24 and D3m / d3m×EP23=5.12 mm;

[0037] Fig.23 A dimension-marked diagram of an imaging lens assembly according to another optional embodiment of the present invention is shown.

[0038] The above drawings include the following reference numerals:

[0039] P0, lens barrel; E1, first lens; S1, object-side surface of the first lens; S2, image-side surface of the first lens; E2, second lens; S3, object-side surface of the second lens; S4, image-side surface of the second lens; E3, third lens; S5, object-side surface of the third lens; S6, image-side surface of the third lens; E4, fourth lens; S7, object-side surface of the fourth lens; S8, image-side surface of the fourth lens; E5, fifth lens; S9, object-side surface of the fifth lens; S10, image-side surface of the fifth lens; P1, first spacing element; P2, second spacing element; P3, third spacing element; P4, fourth spacing element. DETAILED DESCRIPTION

[0040] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0041] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meanings as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0042] In the present invention, unless otherwise specified, the directional words used, such as "up, down, top, bottom", usually refer to the directions shown in the drawings, or to the components themselves in the vertical, perpendicular or gravity directions; similarly, for ease of understanding and description, "inside and outside" refer to the inside and outside relative to the outline of each component itself, but the above-mentioned directional words are not used to limit the present invention.

[0043] It should be noted that in this 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 features. Therefore, without departing from the teaching of the present application, the first lens discussed below may also be referred to as the second lens or the third lens.

[0044] In the drawings, for ease of illustration, the thickness, dimensions, and shape of the lens have been slightly exaggerated. Specifically, the spherical or aspherical shapes shown in the drawings are shown by way of example. That is, the spherical or aspherical shapes are not limited to the spherical or aspherical shapes shown in the drawings. The drawings are for illustrative purposes only and are not drawn to an exact scale.

[0045] In this text, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface 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 position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The judgment of the surface shape in the paraxial region can be based on the judgment method of those with ordinary knowledge in the field, and the positive or negative of the R value (R refers to the radius of curvature in the paraxial region, usually the R value on the lens database (lens data) in optical software) is used to judge the convexity and concavity. Taking the object side surface as an example, when the R value is positive, it is judged as convex, and when the R value is negative, it is judged as concave; taking the image side surface as an example, when the R value is positive, it is judged as concave, and when the R value is negative, it is judged as convex. In this application, the left side is the object side and the right side is the image side.

[0046] To solve the problem that the existing five-piece imaging lens group has serious stray light due to meeting the telephoto requirements, the present invention provides an imaging lens group.

[0047] As Figures 1 to 23 shown, in an optional embodiment of the present application, the imaging lens group includes a lens barrel and a lens group and a spacer element group disposed in the lens barrel. The lens group is composed of five lenses. The five lenses are, in order from the object side to the image side, a first lens, a second lens, a third lens, a fourth lens, and a fifth lens; the spacer element group includes a second spacer element disposed on the image side of the second lens and at least partially in contact with the image side surface of the second lens, and a third spacer element disposed on the image side of the third lens and at least partially in contact with the image side surface of the third lens; between the effective focal length f2 of the second lens and the effective focal length f3 of the third lens, it satisfies: -2.8 < f2 / f3 < -1.5; between the effective focal length f3 of the third lens and the radius of curvature R5 of the object side surface of the third lens, it satisfies: 0 < |f3 / R5| < 0.3; between the image side inner diameter d3m of the third spacer element, the image side outer diameter D3m of the third spacer element, and the distance EP23 along the optical axis direction from the image side surface of the second spacer element to the object side surface of the third spacer element, it satisfies: 2.8 mm < D3m / d3m × EP23 < 6.1 mm.

[0048] The imaging lens group of the present application consists of a lens barrel and five lenses and multiple spacer elements arranged in the lens barrel. By reasonably arranging the positions of the five lenses, the second and third spacer elements and setting the imaging lens group to satisfy -2.8 < f2 / f3 < -1.5 and 0 < |f3 / R5| < 0.3, it is beneficial to adjust the focal length of the front lens to ensure the telephoto function. However, in this case, light is prone to refraction or reflection at the edges of the structural components after entering the imaging lens group, resulting in serious stray light and affecting the imaging quality. Therefore, by restricting 2.8mm < D3m / d3m × EP23 < 6.1mm, the trend of light incident on the third lens after exiting the second lens can be effectively controlled, while ensuring the number of light rays and energy within the field of view, enabling the third spacer element to absorb part of the light rays that may enter the edge flange structure of the lens, reducing stray light. By controlling the axial distance between the image side of the second spacer element and the object side of the third spacer element, the edge thickness of the third lens can be prevented from being too thick, effectively weakening the energy of the stray light spot, and thus being beneficial to ensuring the imaging quality of the imaging lens group.

[0049] In the present application, there is an air gap between any two adjacent lenses among the first lens to the fifth lens. The spacer element group further includes a first spacer element placed on the image side of the first lens and at least partially in contact with the image side of the first lens, and a fourth spacer element placed on the image side of the fourth lens and at least partially in contact with the image side of the fourth lens.

[0050] In addition, referring to Table 1 below and Fig. 20 、 Fig.21 and Fig. 22 as shown, on the premise that the imaging lens group satisfies f2 / f3 = -1.57 and |f3 / R5| = 0.24, the stray light is weaker when the imaging lens group satisfies D3m / d3m × EP23 = 5.12mm. Fig. 20 shows the stray light optical path diagram when the imaging lens group satisfies D3m / d3m × EP23 = 2.1mm. Fig.21 shows the stray light optical path diagram when the imaging lens group satisfies D3m / d3m × EP23 = 6.5mm. Fig. 22 shows the stray light optical path diagram when the imaging lens group satisfies D3m / d3m × EP23 = 5.12mm. Fig. 20 、 Fig.21 and Fig. 22 The bold black solid lines in

[0051] are composed of Figure 20 to Figure 22It can be known that when D3m / d3m×EP23 = 2.1 mm is satisfied, the inner diameter of the third spacer element is too large to block the stray light in the outer field of view, and the stray light is relatively serious. When D3m / d3m×EP23 = 6.5 mm is satisfied, the edge thickness of the third lens is relatively large, resulting in that the incident stray light cannot be reflected multiple times at the edge mechanism position, and the stray light energy is relatively strong. When D3m / d3m×EP23 = 5.12 mm is satisfied, the light trend is relatively balanced, the stray light is weak, and the performance is the best. Thus, it can be seen that when D3m / d3m×EP23 is in the range of 2.8 mm to 6.1 mm, the trend of light incident on the third lens after exiting the second lens can be effectively controlled. At the same time, the number and energy of light in the field of view are ensured, so that the third spacer element can absorb part of the light that may enter the edge flange structure of the lens, reduce the stray light, and at the same time can control the edge thickness of the third lens not to be too thick, effectively weakening the energy of the stray light spot and improving the imaging quality of the imaging lens group.

[0052]

[0053] Table 1

[0054] In this embodiment, the following is satisfied among the curvature radius R3 of the object side surface of the second lens, the object side outer diameter D2s of the second spacer element, and the object side inner diameter d2s of the second spacer element: 0.5 < π×(D2s 2 -d2s 2 ) / R3 2 < 1.5. By controlling the curvature radius of the object side surface of the second lens, the processability of the second lens can be improved, the problems of surface shape deviation, distortion and appearance caused by molding can be reduced, and the production yield of the lens can be improved; in addition, by controlling the inner diameter of the object side surface of the second spacer element, the stray light generated by the second lens can be effectively blocked, the generation of stray light can be avoided, and the imaging quality can be improved.

[0055] In this embodiment, the following is satisfied between the axial interval distance EP34 from the image side surface of the third spacer element to the object side surface of the fourth spacer element and the central thickness CT4 of the fourth lens: 0.6 < EP34 / CT4 ≤ 1.5. By controlling this conditional expression, it is ensured that the central thickness and the edge thickness of the fourth lens can be in a relatively reasonable range, the risk of welding marks during the molding of the fourth lens is reduced, thereby reducing the risk of stray light caused by welding marks, improving the imaging cleanliness, reducing the demolding force when the plastic lens is demolded after molding, reducing the risk of surface shape deviation from the design curve caused by lens demolding deformation, and improving the MTF quality of the imaging lens group.

[0056] In this embodiment, the distance EP23 along the optical axis direction from the image side surface of the second spacer element to the object side surface of the third spacer element satisfies 1.5 < EP23 / CT3 < 2.0 with the center thickness CT3 of the third lens. By controlling the center thickness of the third lens, the appearance impurity problem during the molding process can be reduced; at the same time, by controlling the center thickness of the third lens, the overall strength of the lens can be ensured, avoiding molding problems caused by uneven lens thickness ratios and deformation problems caused by excessive local pressure on the lens after assembly, and avoiding affecting the field curvature and on-axis peak value of the MTF.

[0057] In this embodiment, the effective focal length f of the imaging lens group, the entrance pupil diameter EPD of the imaging lens group, and the object side inner diameter d0s of the lens barrel satisfy 19 mm < f / EPD × d0s < 24 mm. By controlling this conditional expression, this imaging lens group can obtain a relatively large amount of incident light, and a relatively clear shooting effect can also be obtained at night.

[0058] In this embodiment, the reflectivity of the first spacer element in the visible light band is less than 3%, and the maximum axial thickness CP1 of the first spacer element, the image side inner diameter d1m of the first spacer element, and the object side inner diameter d1s of the first spacer element satisfy 0 ≤ CP1 / (d1m + d1s) < 0.2. The first spacer element can block the edge flange structure of the first lens, reducing the risk of internal stray light of the first lens. By controlling the maximum thickness of the first spacer element, the lens spacing is evenly distributed along the optical axis direction, and the uniformity of the lens structure is ensured within the design specifications, avoiding the situation where the lens is locally sensitive to pressure, resulting in large local surface shape changes after assembly and affecting the imaging quality.

[0059] In this embodiment, the maximum radial thickness M at the bearing position between the lens barrel and the fourth lens satisfies 0.6 mm < M < 1.1 mm. Such a setting can make the overall wall thickness of the lens barrel relatively uniform, which is beneficial to the molding of the lens barrel, improving the inner diameter gear accuracy and the assembly stability.

[0060] In this embodiment, the axial distance SAG41 between the intersection point of the object side surface of the fourth lens and the optical axis and the vertex of the effective radius of the object side surface of the fourth lens satisfies -58 < D4s / SAG41 < 42, and D4s / SAG41 ≠ 0 with the object side outer diameter D4s of the fourth spacer element. By controlling the axial distance between the intersection point of the object side surface of the fourth lens and the optical axis and the vertex of the effective radius of the object side surface of the fourth lens, the gate of the fourth lens and the lens center are as straight as possible during the injection molding process, making the lens molding filling more uniform and reducing the risk of weld line generation. At the same time, the fourth spacer element can block the joint segment difference generated during the molding of the effective diameter edge of the fourth lens, improving the stray light yield.

[0061] In this embodiment, the following conditions are satisfied between the radius of curvature R2 of the image side surface of the first lens and the radius of curvature R3 of the object side surface of the second lens: -60 < R2 / R3 < 8; the following condition is satisfied between the maximum axial thickness CP1 of the first spacer element and the air gap T12 between the first lens and the second lens on the optical axis: 0 ≤ CP1 / T12 < 1.6. By controlling this condition, it is ensured that the central thickness of the lens can be within a relatively reasonable range. In addition, the maximum thickness of the spacer element that is at least partially in contact with the image side surface of the lens with the maximum central thickness in the imaging lens group is controlled to avoid assembly interference, and at the same time, it is more convenient to adjust the field curvature in the later stage. By controlling the radius of curvature of the first lens, the trend of light rays after entering the system is relatively gentle, and the gradient of the relative illuminance decrease in each field of view is more uniform.

[0062] In this embodiment, the following condition is satisfied among the refractive index N4 of the fourth lens, the radius of curvature R7 of the object side surface of the fourth lens, the radius of curvature R8 of the image side surface of the fourth lens, and the object side outer diameter D4s of the fourth spacer element: -471 mm < N4 × R7 / R8 × D4s < -32 mm. By controlling this condition, the light blocking efficiency of the fourth spacer element can be effectively improved. When the inner and outer diameters of the fourth spacer element are within this range, the risks of baking deformation and assembly eccentricity of the fourth spacer element can be greatly reduced, and the generation of leakage light and stray light caused by the deformation and assembly eccentricity of the spacer element can be reduced; in addition, through this conditional formula, the smoothness and formability of the central optical effective surface of the fourth lens can be improved, and the imaging quality can be improved.

[0063] In this embodiment, the first lens has a positive optical power, and its object side surface is convex; the second lens has a positive optical power, its object side surface is convex, and its image side surface is convex; the third lens has a negative optical power, and its image side surface is concave; the fourth lens has a positive optical power, its object side surface is convex, and its image side surface is convex; the fifth lens has a negative optical power, its object side surface is convex, and its image side surface is concave. By reasonably planning the optical power and surface shape of each lens, it is beneficial to ensure that the light ray trend is transmitted along the designed path, beneficial to ensuring the smoothness of light ray transmission, ensuring imaging stability, and at the same time enabling the aberrations between the lenses to cancel each other out, reducing aberrations, optimizing field curvature and distortion.

[0064] Optionally, the imaging lens group in the embodiment of the present application can be simulated by software and / or tools such as ZEMAX, CODEV, etc. During the simulation using software and / or tools such as the above, the surface shape of each lens can be appropriately adjusted according to the surface shape provided by the software and / or tool used.

[0065] In addition, in another optional embodiment of the present application, as Figures 1 to 23As shown, the imaging lens group includes a lens barrel, a lens group, and a spacer element group disposed in the lens barrel. The lens group consists of five lenses. The five lenses are, in order from the object side to the image side, a first lens with positive optical power, a second lens with positive optical power, a third lens with negative optical power, a fourth lens with positive optical power, and a fifth lens with negative optical power. The spacer element group includes a second spacer element disposed on the image side of the second lens and at least partially in contact with the image side surface of the second lens, and a third spacer element disposed on the image side of the third lens and at least partially in contact with the image side surface of the third lens. The following relationships are satisfied between the effective focal length f2 of the second lens and the effective focal length f3 of the third lens: -2.8 < f2 / f3 < -1.5. The following relationship is satisfied between the effective focal length f3 of the third lens and the radius of curvature R5 of the object side surface of the third lens: 0 < |f3 / R5| < 0.3. The following relationship is satisfied between the radius of curvature R3 of the object side surface of the second lens, the outer diameter D2s of the object side of the second spacer element, and the inner diameter d2s of the object side of the second spacer element: 0.5 < π×(D2s 2 -d2s 2 ) / R3 2 < 1.5.

[0066] The imaging lens group of the present application consists of a lens barrel, five lenses, and multiple spacer elements disposed in the lens barrel. By reasonably arranging the optical powers of the five lenses, the positions of the second and third spacer elements, and setting the imaging lens group to satisfy -2.8 < f2 / f3 < -1.5 and 0 < |f3 / R5| < 0.3, it is beneficial to ensure the adjustment of the focal length of the front lens to ensure the telephoto function. However, in this case, light is prone to refraction or reflection at the edges of the structural members after entering the imaging lens group, resulting in serious stray light and affecting the imaging quality. By restricting 0.5 < π×(D2s 2 -d2s 2 ) / R3 2 < 1.5, the radius of curvature of the object side surface of the second lens can be controlled, which can improve the processability of the second lens, reduce the problems of surface shape deviation, distortion, and appearance caused by molding, and improve the production yield of the lens. In addition, by controlling the inner diameter of the object side surface of the second spacer element, the stray light rays generated by the second lens can be effectively blocked, avoiding the generation of stray light and improving the imaging quality.

[0067] Of course, other parametric forms in the above embodiments may also be included in this embodiment, which will not be elaborated here one by one.

[0068] In addition, in another alternative embodiment of the present application, as Figures 1 to 23As shown, an imaging lens group includes a lens barrel, a lens group, and a spacer element group disposed in the lens barrel. The lens group consists of five lenses. The five lenses are, in order from the object side to the image side, a first lens with positive optical power, a second lens with positive optical power, a third lens with negative optical power, a fourth lens with positive optical power, and a fifth lens with negative optical power. The spacer element group includes a second spacer element disposed on the image side of the second lens and at least partially in contact with the image side surface of the second lens, a third spacer element disposed on the image side of the third lens and at least partially in contact with the image side surface of the third lens, and a fourth spacer element disposed on the image side of the fourth lens and partially abutting against the image side surface of the fourth lens. The following conditions are satisfied between the effective focal length f3 of the third lens and the inner diameter d3m of the image side of the third spacer element: -1.2 < f3 / d3m < -0.7. The following condition is satisfied between the curvature radius R7 of the object side surface of the fourth lens and the outer diameter D4s of the object side of the fourth spacer element: 1.8 < R7 / D4s < 30.5.

[0069] The imaging lens group of the present application consists of a lens barrel, five lenses, and multiple spacer elements disposed in the lens barrel. By reasonably arranging the optical powers of the five lenses, the positions of the second, third, and fourth spacer elements, and setting the imaging lens group to satisfy -1.2 < f3 / d3m < -0.7 and 1.8 < R7 / D4s < 30.5, it is beneficial for the third and fourth spacer elements to block peripheral stray light, thereby weakening the influence of stray light on the imaging quality, ensuring the imaging quality, and at the same time being beneficial for ensuring the surface shape rationality of the fourth lens and ensuring the processing feasibility.

[0070] Of course, other parametric forms in the above embodiments may also be included in this embodiment, which will not be elaborated here one by one.

[0071] Optionally, the above imaging lens group may further include a protective glass for protecting the photosensitive element located on the imaging surface.

[0072] In the imaging lens group of the present application, multiple lenses may be used, such as the five lenses described above. In the present application, at least one of the mirror surfaces of each lens is an aspherical mirror surface. The characteristics of an aspherical lens are that the curvature changes continuously from the center of the lens to the periphery of the lens. Different from a spherical lens with 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 the advantages of improving distortion aberration and astigmatism aberration. After using an aspherical lens, it is possible to eliminate the aberration that appears during imaging as much as possible, thereby improving the imaging quality.

[0073] However, those skilled in the art should understand that, without departing from the technical solution claimed in the present application, the number of lenses constituting the imaging lens group can be changed to obtain the various results and advantages described in this specification. For example, although five lenses are described as an example in the embodiments, the imaging lens group is not limited to including five lenses. If necessary, the imaging lens group may also include other numbers of lenses.

[0074] Figure 1 A schematic diagram of the dimensions of an imaging lens assembly of the present application is shown. Figure 1 Parameters such as D3m, d3m, D2s, d2s, EP23, EP34, d0s, d1m, d1s, CP1, D4s, and M are indicated in the figure. Fig.23 A schematic diagram of the dimensions of an imaging lens assembly of the present application is shown. Fig.23 SAG41 is indicated in the middle to clearly and intuitively understand the meaning of this parameter. In order to facilitate the description of the imaging lens group and the surface shape of the specific lens, these parameters will no longer be reflected in the drawings when describing the specific embodiments later.

[0075] The following further describes examples of specific surface shapes and parameters of the imaging lens group applicable to the above-mentioned embodiment with reference to the accompanying drawings.

[0076] It should be noted that in the following embodiment 1, there are three examples of embodiment 1-1, embodiment 1-2, and embodiment 1-3; in embodiment 2, there are three examples of embodiment 2-1, embodiment 2-2, and embodiment 2-3; and in embodiment 3, there are three examples of embodiment 3-1, embodiment 3-2, and embodiment 3-3. In the three examples of the same embodiment, the parameters such as the radius of curvature, center thickness, and spacing distances between lenses of the imaging lens group from the first lens to the fifth lens, and the coefficients of high-order terms are the same, but the parameters such as the thickness, inner diameter, and outer diameter of the lens barrel, the first spacing element to the fourth spacing element, and the shapes of some lenses are different. In other words, the main structure for imaging is the same, but the auxiliary structure for imaging is different.

[0077] It should be noted that any one of the following embodiments 1 to 3 is applicable to all embodiments of the present application.

[0078] Embodiment 1

[0079] like Figures 2 to 7 As shown, the imaging lens group of embodiment 1 is described. Figure 2 Schematic diagram of the structure of the imaging lens group of Example 1-1 is shown, Figure 3 The structure diagram of the imaging lens group of Embodiment 1-2 is shown. Figure 4 A schematic diagram of the structure of the imaging lens group of Examples 1-3 is shown.

[0080] like Figures 2 to 4 As shown, the imaging lens group includes a lens barrel P0 and a first lens E1, a first spacing element P1, a second lens E2, a second spacing element P2, a third lens E3, a third spacing element P3, a fourth lens E4, a fourth spacing element P4, and a fifth lens E5, which are arranged in sequence in the lens barrel P0 from the object side to the image side along the optical axis.

[0081] like Figure 2 As shown, it is a structural schematic diagram of the imaging lens group of Example 1-1. In this example, two first auxiliary spacer elements are also provided on the image side of the first spacer element P1. The object side surface and image side surface of the first spacer element P1 are respectively abutted with the image side surface S2 of the first lens and the object side surface of the auxiliary assembly composed of the two first auxiliary spacer elements, and the image side surface of the auxiliary assembly is partially abutted with the object side surface S3 of the second lens. The object side surface and image side surface of the second spacer element P2 are respectively abutted with the image side surface S4 of the second lens and the object side surface S5 of the third lens. The object side surface and image side surface of the third spacer element P3 are respectively abutted with the image side surface S6 of the third lens and the object side surface S7 of the fourth lens. The object side surface and image side surface of the fourth spacer element P4 are respectively abutted with the image side surface S8 of the fourth lens and the object side surface S9 of the fifth lens.

[0082] like Figure 3 As shown, it is a schematic diagram of the structure of the imaging lens group of Example 1-2. The difference between this example and Example 1-1 is that a third auxiliary spacer element is provided on the image side of the third spacer element P3, and the first auxiliary spacer element is not provided. The object side surface and image side surface of the first spacer element P1 are respectively abutted with the image side surface S2 of the first lens and the object side surface S3 of the second lens. The object side surface and image side surface of the third spacer element P3 are respectively abutted with the image side surface S6 of the third lens and the object side surface of the third auxiliary spacer element, and the image side surface of the third auxiliary spacer element is partially abutted with the object side surface S7 of the fourth lens. The supporting and abutting mode of the remaining spacer elements is the same as that of Example 1-1, and the relevant description in Example 1-1 may be referred to, and no further description is given here.

[0083] like Figure 4 As shown, it is a schematic diagram of the structure of the imaging lens group of Example 1-3. The difference between this example and Example 1-2 is that a first auxiliary spacing element is provided on the image side of the first spacing element P1. The object side surface and image side surface of the first spacing element P1 are respectively abutted against the image side surface S2 of the first lens and the object side surface of the first auxiliary spacing element, and the image side surface of the first auxiliary spacing element is abutted against the object side surface S3 of the second lens. The supporting and abutting manner of the remaining spacing elements is the same as that of Example 1-2, and the relevant description in Example 1-2 may be referred to, and no further description is given here.

[0084] In summary, the structural parameters of the imaging lens group of Example 1 in Example 1-1, Example 1-2, and Example 1-3 refer to

[0085] As shown in Table 2. (Unit: mm)

[0086] Parameters\Example 1-1 1-2 1-3 D3m 9.89 10.50 10.40 d3m 8.03 5.59 7.74 D2s 9.60 9.90 10.10 d2s 5.85 5.85 5.85 EP34 1.91 3.77 2.31 EP23 2.35 2.31 2.50 d0s 11.10 11.38 11.97 d1m 7.21 7.50 8.13 d1s 7.21 8.13 8.32 CP1 0.01 2.94 2.46 D4s 11.20 11.30 11.50 M 1.06 1.06 1.06 SAG41 0.275 0.275 0.275

[0087] Table 2

[0088] In the first embodiment, the object side surface S1 of the first lens is a convex surface, and the image side surface S2 of the first lens is a convex surface. The object side surface S3 of the second lens is a convex surface, and the image side surface S4 of the second lens is a convex surface. The object side surface S5 of the third lens is a concave surface, and the image side surface S6 of the third lens is a concave surface. The object side surface S7 of the fourth lens is a convex surface, and the image side surface S8 of the fourth lens is a convex surface. The object side surface S9 of the fifth lens is a convex surface, and the image side surface S10 of the fifth lens is a concave surface.

[0089] In Example 1, the aperture value Fno of the imaging lens group is 2.0, the effective focal length f of the imaging lens group is 14.95 mm, the effective focal length f1 of the first lens is 12.59 mm, the effective focal length f2 of the second lens is 15.55 mm, the effective focal length f3 of the third lens is -6.26 mm, the effective focal length f4 of the fourth lens is 12.75 mm, and the effective focal length f5 of the fifth lens is -18.75 mm.

[0090] Table 3 shows the basic structural parameters of the imaging lens group of Example 1, wherein the units of the radius of curvature and thickness / distance are all millimeters (mm).

[0091]

[0092] Table 3

[0093] In the first embodiment, the object side surface and the image side surface of the first lens E1 to the fifth lens E5 are all aspherical surfaces, and the surface shape of each aspherical lens can be defined by but not limited to the following aspherical surface formula:

[0094]

[0095] Wherein, x is the distance vector height from the vertex of the aspheric surface when the aspheric surface is at a height of h along the optical axis; c is the paraxial curvature of the aspheric surface, c=1 / R, that is, the paraxial curvature c is the reciprocal of the curvature radius R in the above Table 1; k is the cone coefficient; Ai is the correction coefficient of the i-th order of the aspheric surface. The following Table 4 gives the high-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 that can be used for each aspheric mirror surface s1-s10s in Example 1.

[0096]

[0097]

[0098] Table 4

[0099] Figure 5 The axial chromatic aberration curve of the imaging lens group of the first embodiment is shown, which indicates the deviation of the focal point of light rays of different wavelengths after passing through the imaging lens group. Figure 6 The astigmatism curve of the imaging lens group of the first embodiment is shown, which represents the meridional image curvature and the sagittal image curvature. Figure 7 The distortion curve of the imaging lens assembly of the first embodiment is shown, which indicates the distortion magnitude values ​​corresponding to different field angles.

[0100] according to Figures 5 to 7 It can be seen that the imaging lens group provided in the first embodiment can achieve good imaging quality.

[0101] Embodiment 2

[0102] like Figures 8 to 13 As shown, the imaging lens group of embodiment 2 is described. Figure 8 The structure diagram of the imaging lens group of Example 2-1 is shown. Fig. 9 2-2 shows a schematic structural diagram of the imaging lens group of Example 2-2, Fig.10 A schematic diagram of the structure of the imaging lens group of Example 2-3 is shown.

[0103] like Figures 8 to 10 As shown, the imaging lens group includes a lens barrel P0 and a first lens E1, a first spacing element P1, a second lens E2, a second spacing element P2, a third lens E3, a third spacing element P3, a fourth lens E4, a fourth spacing element P4, and a fifth lens E5, which are arranged in sequence in the lens barrel P0 from the object side to the image side along the optical axis.

[0104] like Figure 8 , which is a schematic diagram of the structure of the imaging lens group of Example 2-1. In this example, the object side surface and image side surface of the first spacing element P1 are respectively in contact with the image side surface S2 of the first lens and the object side surface S3 of the second lens. The object side surface and image side surface of the second spacing element P2 are respectively in contact with the image side surface S4 of the second lens and the object side surface S5 of the third lens. The object side surface and image side surface of the third spacing element P3 are respectively in contact with the image side surface S6 of the third lens and the object side surface S7 of the fourth lens. The object side surface and image side surface of the fourth spacing element P4 are respectively in contact with the image side surface S8 of the fourth lens and the object side surface S9 of the fifth lens.

[0105] like Fig. 9The figure is a schematic diagram of the structure of the imaging lens group of Example 2-2. The difference between this example and Example 2-1 is that a first auxiliary spacer element is provided on the image side of the first spacer element P1. The object side surface and image side surface of the first spacer element P1 are respectively abutted against the image side surface S2 of the first lens and the object side surface of the first auxiliary spacer element, and the image side surface of the first auxiliary spacer element is abutted against the object side surface S3 of the second lens. The abutment method of the remaining spacer elements is the same as that of Example 2-1, and the relevant description in Example 2-1 may be referred to, and no further description is given here.

[0106] like Fig.10 , which is a schematic structural diagram of the imaging lens assembly of Example 2-3. The abutment manner of the spacer element in this example is the same as that in Example 2-2, and the relevant description in Example 2-2 may be referred to, and will not be repeated here.

[0107] In summary, the structural parameters of the imaging lens group of the second embodiment in the embodiments 2-1, 2-2 and 2-3 refer to

[0108] As shown in Table 5. (Unit: mm)

[0109] Parameters\Example 2-1 2-2 2-3 D3m 11.48 11.64 11.80 d3m 6.09 6.08 6.11 D2s 11.28 11.44 11.60 d2s 7.35 7.35 7.20 EP34 2.40 2.50 2.20 EP23 3.20 3.00 3.13 d0s 11.20 11.38 11.38 d1m 9.27 8.75 8.26 d1s 9.69 8.75 9.66 CP1 1.55 0.10 1.55 D4s 11.68 11.84 12.00 M 0.66 0.76 0.76 SAG41 -0.209 -0.209 -0.209

[0110] Table 5

[0111] In the second embodiment, the object side surface S1 of the first lens is a convex surface, and the image side surface S2 of the first lens is a concave surface. The object side surface S3 of the second lens is a convex surface, and the image side surface S4 of the second lens is a convex surface. The object side surface S5 of the third lens is a concave surface, and the image side surface S6 of the third lens is a concave surface. The object side surface S7 of the fourth lens is a convex surface, and the image side surface S8 of the fourth lens is a convex surface. The object side surface S9 of the fifth lens is a convex surface, and the image side surface S10 of the fifth lens is a concave surface.

[0112] In Example 2, the aperture value Fno of the imaging lens group is 1.7, the effective focal length f of the imaging lens group is 14.96 mm, the effective focal length f1 of the first lens is 13.53 mm, the effective focal length f2 of the second lens is 18.12 mm, the effective focal length f3 of the third lens is -6.63 mm, the effective focal length f4 of the fourth lens is 22.01 mm, and the effective focal length f5 of the fifth lens is -48.64 mm.

[0113] Table 6 shows the basic structural parameters of the imaging lens group of Example 2, wherein the units of the radius of curvature and thickness / distance are all millimeters.

[0114]

[0115]

[0116] Table 6

[0117] Table 7 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 that can be used for each aspherical mirror surface s1-s10s in Example 2.

[0118] Face number A4 A6 A8 A10 A12 A14 A16 s1 -2.3979E-01 -4.1997E-02 -7.5667E-03 -1.3851E-03 -2.5101E-04 -4.7884E-05 -2.4142E-06 s2 -2.9126E-01 -2.6093E-02 -1.7880E-03 -5.9973E-04 3.3581E-06 3.1165E-05 6.2790E-06 s3 -7.4580E-02 -2.0759E-02 1.0535E-03 -1.0479E-03 -2.8140E-04 4.7658E-05 7.9638E-05 s4 9.0112E-02 -3.7101E-02 1.6406E-02 -6.7379E-03 -9.1572E-03 3.7021E-03 -8.9640E-04 s5 -6.1574E-03 4.3199E-02 1.9787E-02 -5.7494E-03 -6.7714E-03 2.3773E-03 -4.1411E-04 s6 -2.5963E-01 1.7348E-02 3.3927E-04 -1.4749E-03 -3.9765E-04 1.0744E-05 1.1312E-04 s7 -1.6783E-01 -4.6647E-02 -4.8616E-03 -1.9999E-03 -8.0558E-04 -1.1981E-04 1.7817E-04 s8 -4.3096E-01 5.2737E-02 -1.7619E-02 1.1007E-02 -2.5627E-03 1.4966E-03 9.0679E-05 s9 -2.0782E+00 2.6925E-01 -4.4767E-02 1.8138E-02 -4.2659E-03 8.5547E-04 1.0127E-04 s10 -2.7314E+00 2.0387E-01 -6.2960E-02 1.0482E-02 -4.0311E-03 -2.8816E-05 1.3884E-04 Face number A18 A20 A22 A24 A26 A28 A30 s1 3.2944E-06 7.5603E-06 1.5366E-06 3.4200E-06 2.1779E-06 3.9619E-06 9.0689E-07 s2 1.3377E-05 -8.0279E-07 3.5012E-06 4.6027E-06 3.8373E-06 1.6131E-06 2.3313E-07 s3 5.1366E-05 4.1614E-06 -3.3517E-06 1.9423E-06 1.5761E-06 1.3342E-06 -1.2665E-06 s4 -6.2523E-04 3.4981E-04 0 0 0 0 0 s5 -5.2147E-04 2.6417E-04 0 0 0 0 0 s6 4.9174E-05 7.1523E-06 -6.3700E-06 -8.5506E-06 -7.5281E-06 2.2241E-07 1.7599E-06 s7 1.4651E-04 7.2835E-05 2.0939E-05 -1.7968E-07 -1.0342E-06 -1.3321E-06 -1.0335E-06 s8 8.5154E-05 -1.1962E-04 -7.0903E-05 -3.6219E-05 9.1353E-06 -1.5900E-06 4.9933E-06 s9 -3.2450E-04 -1.6326E-04 -5.2125E-05 2.1100E-05 5.9491E-05 -6.2154E-06 -5.1032E-06 s10 -3.9696E-04 1.2129E-04 -5.5093E-05 9.6627E-05 2.7179E-05 1.1411E-05 -1.9271E-05

[0119] Table 7

[0120] Fig.11 The axial chromatic aberration curve of the imaging lens group of the second embodiment is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the imaging lens group. Fig.12 The astigmatism curve of the imaging lens group of Example 2 is shown, which represents the meridional image curvature and the sagittal image curvature. Fig.13 The distortion curve of the imaging lens assembly of the second embodiment is shown, which indicates the distortion magnitude values ​​corresponding to different field angles.

[0121] according to Figures 11 to 13 It can be seen that the imaging lens group provided in the second embodiment can achieve good imaging quality.

[0122] Embodiment 3

[0123] like Figures 14 to 19 As shown, the imaging lens group of embodiment 3 is described. Fig.14 The structure diagram of the imaging lens group of Example 3-1 is shown. Fig.15 Schematic diagram of the structure of the imaging lens group of Example 3-2 is shown, Fig.16 A schematic structural diagram of the imaging lens group of Example 3-3 is shown.

[0124] like Figures 14 to 16 As shown, the imaging lens group includes a lens barrel P0 and a first lens E1, a first spacing element P1, a second lens E2, a second spacing element P2, a third lens E3, a third spacing element P3, a fourth lens E4, a fourth spacing element P4, and a fifth lens E5, which are arranged in sequence in the lens barrel P0 from the object side to the image side along the optical axis.

[0125] like Fig.14, which is a schematic diagram of the structure of the imaging lens group of Example 3-1. In this example, the object side surface and image side surface of the first spacing element P1 are respectively in contact with the image side surface S2 of the first lens and the object side surface S3 of the second lens. The object side surface and image side surface of the second spacing element P2 are respectively in contact with the image side surface S4 of the second lens and the object side surface S5 of the third lens. The object side surface and image side surface of the third spacing element P3 are respectively in contact with the image side surface S6 of the third lens and the object side surface S7 of the fourth lens. The object side surface and image side surface of the fourth spacing element P4 are respectively in contact with the image side surface S8 of the fourth lens and the object side surface S9 of the fifth lens.

[0126] like Fig.15 , which is a schematic structural diagram of the imaging lens assembly of Example 3-2. In this example, the supporting and abutting manner of each spacing element is the same as that of Example 3-1, and the relevant description in Example 3-1 may be referred to, and will not be repeated here.

[0127] like Fig.16 , which is a schematic diagram of the structure of the imaging lens group of Example 3-3. The difference between this example and Example 3-1 is that a third auxiliary spacer element is provided on the image side of the third spacer element P3, and the object side surface and image side surface of the third auxiliary spacer element are respectively abutted against the image side surface of the third spacer element P3 and the object side surface S7 of the fourth lens. The abutment manner of the remaining spacer elements is the same as that of Example 3-1, and the relevant description in Example 3-1 may be referred to, and will not be repeated here.

[0128] In summary, the structural parameters of the imaging lens group of the third embodiment in the embodiments 3-1, 3-2 and 3-3 refer to

[0129] As shown in Table 8. (Unit: mm)

[0130] Parameters\Example 3-1 3-2 3-3 D3m 12.64 13.02 13.43 d3m 8.76 10.35 10.85 D2s 12.72 10.59 10.59 d2s 8.52 8.52 8.46 EP34 1.27 1.99 1.19 EP23 3.55 3.67 3.70 d0s 13.12 13.50 13.89 d1m 9.24 9.24 9.23 d1s 9.24 9.24 9.23 CP1 0.06 0.05 0.04 D4s 13.36 13.74 10.60 M 0.91 0.91 0.91 SAG41 -0.499 -0.499 -0.499

[0131] Table 8

[0132] In the third embodiment, the object side surface S1 of the first lens is convex, and the image side surface S2 of the first lens is concave. The object side surface S3 of the second lens is convex, and the image side surface S4 of the second lens is convex. The object side surface S5 of the third lens is convex, and the image side surface S6 of the third lens is concave. The object side surface S7 of the fourth lens is convex, and the image side surface S8 of the fourth lens is convex. The object side surface S9 of the fifth lens is convex, and the image side surface S10 of the fifth lens is concave.

[0133] In Example 3, the aperture value Fno of the imaging lens group is 1.7, the effective focal length f of the imaging lens group is 15.85 mm, the effective focal length f1 of the first lens is 20.45 mm, the effective focal length f2 of the second lens is 15.50 mm, the effective focal length f3 of the third lens is -9.86 mm, the effective focal length f4 of the fourth lens is 24.05 mm, and the effective focal length f5 of the fifth lens is -35.69 mm.

[0134] Table 9 shows the basic structural parameters of the imaging lens group of Example 3, wherein the units of the radius of curvature and thickness / distance are all millimeters.

[0135]

[0136] Table 9

[0137] Table 10 below gives the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, and A30 that can be used for the aspheric mirror surfaces s1-s10s in Example 3.

[0138]

[0139]

[0140] Table 10

[0141] Fig.17 The axial chromatic aberration curve of the imaging lens group of Example 3 is shown, which indicates the deviation of the focal point of light of different wavelengths after passing through the imaging lens group. Fig.18 The astigmatism curve of the imaging lens group of Example 3 is shown, which represents the meridional image curvature and the sagittal image curvature. Fig.19 The distortion curve of the imaging lens assembly of the third embodiment is shown, which indicates the distortion magnitude values ​​corresponding to different field angles.

[0142] according to Figures 17 to 19 It can be seen that the imaging lens group provided in the third embodiment can achieve good imaging quality.

[0143] In summary, Embodiment 1 to Embodiment 3 respectively satisfy the relationship shown in Table 11.

[0144] Conditional_Data 1-1 1-2 1-3 2-1 2-2 2-3 3-1 3-2 3-3 f2 / f3 -2.48 -2.48 -2.48 -2.73 -2.73 -2.73 -1.57 -1.57 -1.57 |f3 / R5| 0.24 0.24 0.24 0.06 0.06 0.06 0.24 0.24 0.24 D3m / d3m×EP23(mm) 2.89 4.34 3.36 6.03 5.74 6.04 5.12 4.62 4.58 <![CDATA[π×(D2s 2 -d2s 2 ) / R3 2 ]]> 1.13 1.24 1.32 0.96 1.01 1.08 1.37 0.61 0.62 EP34 / CT4 0.68 1.35 0.83 0.92 0.96 0.85 0.96 1.50 0.90 EP23 / CT3 1.80 1.76 1.91 1.71 1.60 1.67 1.65 1.70 1.72 f / EPD×d0s(mm) 22.20 22.76 23.94 19.04 19.35 19.35 22.30 22.95 23.61 CP1 / (d1m+d1s) 0.00 0.19 0.15 0.08 0.01 0.09 0.00 0.00 0.00 D4s / SAG41 40.73 41.09 41.82 -55.89 -56.65 -57.42 -26.77 -27.54 -21.24 R2 / R3 -59.32 -59.32 -59.32 7.12 7.12 7.12 1.90 1.90 1.90 CP1 / T12 0.00 1.08 0.90 1.33 0.09 1.33 0.57 0.47 0.38 N4×R7 / R8×D4s(mm) -38.89 -39.23 -39.93 -458.08 -464.35 -470.63 -40.36 -41.50 -32.02 f3 / d3m -0.78 -1.12 -0.81 -1.09 -1.09 -1.09 -1.13 -0.95 -0.91 R7 / D4s 1.94 1.92 1.89 30.83 30.41 30.01 3.39 3.30 4.28

[0145] Table 11

[0146] Table 12 shows the effective focal lengths of the lenses of the imaging lens groups of Examples 1 to 3.

[0147]

[0148]

[0149] Table 12

[0150] The present application also provides an imaging device, whose electronic photosensitive element can be a photosensitive coupled device (CCD) or a complementary metal oxide semiconductor element (CMOS). The imaging device can be an independent imaging device such as a digital camera, or an imaging module integrated in a mobile electronic device such as a mobile phone. The imaging device is equipped with the imaging lens group described above.

[0151] Obviously, the above-described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0152] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0153] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the numbers used in this way can be interchanged where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein.

[0154] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. An imaging lens assembly, characterized in that: It includes a lens barrel, a lens group and a spacer element group arranged in the lens barrel. The lens group is composed of five lenses. The five lenses are, in order from the object side to the image side, the first lens, the second lens, the third lens, the fourth lens and the fifth lens. The spacer element group includes a second spacer element placed on the image side of the second lens and at least partially in contact with the image side surface of the second lens, and a third spacer element placed on the image side of the third lens and at least partially in contact with the image side surface of the third lens. Between the effective focal length f2 of the second lens and the effective focal length f3 of the third lens, the following is satisfied: -2.8 < f2 / f3 < -1.5; Between the effective focal length f3 of the third lens and the curvature radius R5 of the object side surface of the third lens, the following is satisfied: 0 < |f3 / R5| < 0.3; Between the image side inner diameter d3m of the third spacer element, the image side outer diameter D3m of the third spacer element and the axial spacing distance EP23 from the image side surface of the second spacer element to the object side surface of the third spacer element along the optical axis, the following is satisfied: 2.8mm < D3m / d3m × EP23 < 6.1mm.

2. The imaging lens assembly according to claim 1, characterized in that: The curvature radius R3 of the object side surface of the second lens, the object side outer diameter D2s of the second spacer element, and the object side inner diameter d2s of the second spacer element satisfy: 0.5<π×(D2s 2 -d2s 2 ) / R3 2 <1.

5.

3. The imaging lens assembly according to claim 1, characterized in that: The spacer element group further includes a fourth spacer element placed on the image side of the fourth lens and at least partially in contact with the image side surface of the fourth lens. Between the axial spacing distance EP34 from the image side surface of the third spacer element to the object side surface of the fourth spacer element along the optical axis and the central thickness CT4 of the fourth lens, the following is satisfied: 0.6 < EP34 / CT4 ≤ 1.

5.

4. The imaging lens assembly according to claim 1, characterized in that: Between the axial spacing distance EP23 from the image side surface of the second spacer element to the object side surface of the third spacer element along the optical axis and the central thickness CT3 of the third lens, the following is satisfied: 1.5 < EP23 / CT3 < 2.

0.

5. The imaging lens assembly according to claim 1, characterized in that: Between the effective focal length f of the imaging lens group, the entrance pupil diameter EPD of the imaging lens group and the object side inner diameter d0s of the lens barrel, the following is satisfied: 19mm < f / EPD × d0s < 24mm.

6. The imaging lens assembly according to claim 1, characterized in that: The spacer element group further includes a first spacer element placed on the image side of the first lens and at least partially in contact with the image side surface of the first lens. The reflectivity of the first spacer element in the visible light band is less than 3%. Between the maximum axial thickness CP1 of the first spacer element, the image side inner diameter d1m of the first spacer element and the object side inner diameter d1s of the first spacer element, the following is satisfied: 0 ≤ CP1 / (d1m + d1s) < 0.

2.

7. The imaging lens assembly according to claim 1, characterized in that: At the bearing position of the lens barrel and the fourth lens, the maximum radial thickness M satisfies: 0.6mm < M < 1.1mm.

8. The imaging lens assembly according to claim 1, characterized in that: The spacer element group further includes a fourth spacer element placed on the image side of the fourth lens and at least partially in contact with the image side surface of the fourth lens. Between the axial distance SAG41 from the intersection point of the object side surface of the fourth lens and the optical axis to the effective radius vertex of the object side surface of the fourth lens and the object side outer diameter D4s of the fourth spacer element, the following is satisfied: -58 < D4s / SAG41 < 42, and D4s / SAG41 ≠ 0.

9. The imaging lens assembly according to claim 1, characterized in that: The spacer element group further includes a first spacer element disposed on the image side of the first lens and at least partially in contact with the image side surface of the first lens, The curvature radius R2 of the image side surface of the first lens and the curvature radius R3 of the object side surface of the second lens satisfy: -60 <R2 / R3<8; The maximum axial thickness CP1 of the first spacing element and the air interval T12 between the first lens and the second lens on the optical axis satisfy the following: 0≤CP1 / T12<1.

6.

10. The imaging lens assembly according to claim 1, characterized in that: The spacer element group further includes a fourth spacer element disposed on the image side of the fourth lens and at least partially in contact with the image side surface of the fourth lens, The refractive index N4 of the fourth lens, the curvature radius R7 of the object side surface of the fourth lens, the curvature radius R8 of the image side surface of the fourth lens and the object side outer diameter D4s of the fourth spacer element satisfy: -471mm <N4×R7 / R8×D4s<-32mm。 11. The imaging lens assembly according to any one of claims 1 to 10, characterized in that: The first lens has positive optical power, and its object side surface is convex; The second lens has positive refractive power, and its object side surface is convex, and its image side surface is convex; The third lens has negative optical power, and its image side surface is concave; The fourth lens has positive refractive power, and its object side surface is convex, and its image side surface is convex; The fifth lens has negative optical power, an object-side surface is convex, and an image-side surface is concave.

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