Imaging lens group

Abstract

The utility model 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 five-piece imaging lens group solves the problem that stray light is serious due to the fact that a five-piece imaging lens group in the prior art meets the telephoto requirement.

Description

TECHNICAL FIELD

[0001] The utility model relates to optical imaging equipment technical field, specifically, relate to a kind of imaging lens group. BACKGROUND

[0002] With the continuous development of smart phone, the function and shooting effect of imaging lens group carried on it have gradually become the key factor of user selection mobile phone.

[0003] At present, taking five-piece long-focus imaging lens group as an example, more and more users require five-piece long-focus imaging lens group on mobile phone to meet the function of long-distance photography, while taking into account high imaging quality. Imaging lens group has long-focus characteristics, whether it is shooting long-distance objects, achieving background blur, shooting macro photos or creating unique perspective works, it can play its unique advantages. However, the current five-piece long-focus imaging lens group needs more lenses or more complex structure in design to meet the telephoto function, and the second lens with positive refractive power and the third lens with negative refractive power and large curvature on the object side are designed, which makes the light transmission in the imaging lens group more likely to refract, reflect and scatter, and is easy to produce lens internal stray light, thereby affecting the imaging quality.

[0004] That is, the five-piece imaging lens group in the prior art has the problem that meeting the requirement of long-distance photography leads to serious stray light. CONTENT OF THE UTILITY MODEL

[0005] The main purpose of the utility model is to provide an imaging lens group to solve the problem that the five-piece imaging lens group in the prior art meets the requirement of long-distance photography and leads to serious stray light.

[0006] In order to achieve the above purpose, according to one aspect of the utility model, an imaging lens group is provided, which comprises a lens barrel, a lens group and a spacer element group arranged in the lens barrel. The lens group is composed of five lenses, and the five lenses are sequentially arranged from the object side to the image side as the first lens, the second lens, the third lens, the fourth lens and the fifth lens. The spacer element group comprises a second spacer element arranged 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 arranged on the image side of the third lens and at least partially in contact with the image side surface of the third lens. The effective focal length f2 of the second lens and the effective focal length f3 of the third lens satisfy the condition: -2.8 < f2 / f3 < -1.5. The effective focal length f3 of the third lens and the curvature radius R5 of the object side surface of the third lens satisfy the condition: 0 < |f3 / R5| < 0.3. 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 between the image side surface of the second spacer element and the object side surface of the third spacer element along the optical axis direction satisfy the condition: 2.8mm < D3m / d3m x EP23 < 6.1mm.

[0007] According to another aspect of the present application, an imaging lens group is provided, comprising a lens barrel and 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 a first lens with positive refractive power, a second lens with positive refractive power, a third lens with negative refractive power, a fourth lens with positive refractive power and a fifth lens with negative refractive power; the spacer element group comprises 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; the effective focal length f2 of the second lens and the effective focal length f3 of the third lens satisfy: -2.8 < f2 / f3 < -1.5; the effective focal length f3 of the third lens and the radius of curvature R5 of the object side surface of the third lens satisfy: 0 < |f3 / R5| < 0.3; the radius of curvature 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.

[0008] According to another aspect of the present application, an imaging lens group is provided, comprising a lens barrel and 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 a first lens with positive refractive power, a second lens with positive refractive power, a third lens with negative refractive power, a fourth lens with positive refractive power and a fifth lens with negative refractive power; the spacer element group comprises 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, 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, and a fourth spacer element placed on the image side of the fourth lens and partially abutting with the image side surface of the fourth lens; the effective focal length f3 of the third lens and the image side inner diameter d3m of the third spacer element satisfy: -1.2 < f3 / d3m < -0.7; the radius of curvature R7 of the object side surface of the fourth lens and the object side outer diameter D4s of the fourth spacer element satisfy: 1.8 < R7 / D4s < 30.5.

[0009] Further, the radius of curvature 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.

[0010] Further, the spacer element group further comprises 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, and a distance EP34 between the image side surface of the third spacer element and the object side surface of the fourth spacer element along the optical axis direction satisfies: 0.6 < EP34 / CT4 ≤ 1.5.

[0011] Further, a distance EP23 between the image side surface of the second spacer element and the object side surface of the third spacer element along the optical axis direction satisfies: 1.5 < EP23 / CT3 < 2.0.

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

[0013] Further, the spacer element group further comprises 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, and a reflectivity of the first spacer element in the visible light wavelength range is less than 3%, and a maximum axial thickness CP1 of the first spacer element, an image side inner diameter d1m of the first spacer element, and an object side inner diameter d1s of the first spacer element satisfy: 0 ≤ CP1 / (d1m+d1s) < 0.2.

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

[0015] Further, the spacer element group further comprises 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, and a distance SAG41 between the intersection 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.

[0016] Further, the spacer element group further comprises 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, and a distance R2 between the curvature radius of the image side surface of the first lens and the curvature radius of the object side surface of the second lens satisfies: -60 < R2 / R3 < 8, and a distance CP1 between the maximum axial thickness of the first spacer element and the air separation T12 of the first lens and the second lens along the optical axis satisfies: 0 ≤ CP1 / T12 < 1.6.

[0017] Further, the spacer element group further comprises 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, and a relationship between 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 satisfies: -471mm < N4 x R7 / R8 x D4s < -32mm.

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

[0019] By applying the technical scheme of the present application, the imaging lens group of the present application is composed of a lens barrel, five lenses arranged in the lens barrel and a plurality of spacer elements, and when the imaging lens group satisfies -2.8 < f2 / f3 < -1.5 and 0 < |f3 / R5| < 0.3 by reasonably arranging the positions of the five lenses and the second and third spacer elements, the focal length of the front lens can be adjusted to ensure that the telephoto function is met. However, in this case, the light entering the imaging lens group is likely to be refracted or reflected at the edge of the structural member, resulting in a serious stray light condition and affecting the imaging quality. Therefore, by limiting 2.8mm < D3m / d3m x EP23 < 6.1mm, the trend of the light entering the third lens after exiting the second lens can be effectively controlled, while the number of light rays and the energy 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 by controlling the interval distance between the image side surface of the second spacer element and the object side surface of the third spacer element along the optical axis direction, the edge thickness of the third lens can be prevented from being too thick, the energy of the stray light spot can be effectively reduced, and the imaging quality of the imaging lens group can be ensured. BRIEF DESCRIPTION OF DRAWINGS

[0020] The drawings accompanying the specification of the present application form a part thereof, serve to provide further understanding of the present application, and together with the specification explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0021] Figure 1 A size marking diagram of the imaging lens group of one optional embodiment of the present application is shown;

[0022] Figure 2 A structure schematic diagram of the imaging lens group of embodiment 1-1 of the present application is shown;

[0023] Figure 3A structure schematic view of the imaging lens group of the embodiment 1-2 of the utility model is shown;

[0024] Figure 4 A structure schematic view of the imaging lens group of the embodiment 1-3 of the utility model is shown;

[0025] Figures 5 to 7 The on-axis chromatic aberration curve, astigmatism curve and distortion curve of the imaging lens group of the embodiment one of the utility model are shown respectively;

[0026] Figure 8 A structure schematic view of the imaging lens group of the embodiment 2-1 of the utility model is shown;

[0027] Figure 9 A structure schematic view of the imaging lens group of the embodiment 2-2 of the utility model is shown;

[0028] Figure 10 A structure schematic view of the imaging lens group of the embodiment 2-3 of the utility model is shown;

[0029] Figures 11 to 13 The on-axis chromatic aberration curve, astigmatism curve and distortion curve of the imaging lens group of the embodiment two of the utility model are shown respectively;

[0030] Figure 14 A structure schematic view of the imaging lens group of the embodiment 3-1 of the utility model is shown;

[0031] Figure 15 A structure schematic view of the imaging lens group of the embodiment 3-2 of the utility model is shown;

[0032] Figure 16 A structure schematic view of the imaging lens group of the embodiment 3-3 of the utility model is shown;

[0033] Figures 17 to 19 The on-axis chromatic aberration curve, astigmatism curve and distortion curve of the imaging lens group of the embodiment three of the utility model are shown respectively;

[0034] Figure 20 The stray light light path diagram when the imaging lens group of one optional embodiment of the utility model satisfies f2 / f3=-1.57, |f3 / R5|=0.24 and D3m / d3m x EP23=2.1mm is shown;

[0035] Figure 21 The stray light light path diagram when the imaging lens group of one optional embodiment of the utility model satisfies f2 / f3=-1.57, |f3 / R5|=0.24 and D3m / d3m x EP23=6.5mm is shown;

[0036] Figure 22The imaging lens group of one optional embodiment of the utility model satisfies the stray light path diagram of f2 / f3=-1.57, |f3 / R5|=0.24 and D3m / d3m*EP23=5.12mm;

[0037] Figure 23 The size marking diagram of the imaging lens group of another optional embodiment of the utility model is shown.

[0038] Among them, the above-mentioned drawings include the following reference signs:

[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 spacer element; P2, second spacer element; P3, third spacer element; P4, fourth spacer element. DETAILED DESCRIPTION

[0040] It should be noted that the embodiments and the features in the embodiments in the present application can be combined with each other without conflict. The utility model will be described in detail below with reference to the drawings and in combination with the embodiments.

[0041] It should be noted that, unless otherwise specified, all the technical and scientific terms used in the present application have the same meaning as that generally understood by the ordinary skilled person in the technical field to which the present application belongs.

[0042] In the utility model, unless otherwise stated, the orientation words such as “up, down, top, bottom” are generally for the direction shown in the drawings, or for the vertical, perpendicular or gravity direction of the components themselves; similarly, for the convenience of understanding and description, “inner, outer” refers to the inner and outer of the contour of each component itself, but the above-mentioned orientation words are not used to limit the utility model.

[0043] It should be noted that, in the present specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, the first lens discussed below can also be referred to as the second lens or the third lens without departing from the teachings of the present application.

[0044] In the drawings, for the sake of clarity, the thickness, dimensions, and shape of the lens are slightly exaggerated. Specifically, the spherical or aspherical shapes shown in the drawings are presented by way of example. That is, the spherical or aspherical shapes are not limited to those 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 this field, using 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) to judge the convexity and concavity by its positive or negative value. Taking the object side, 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, 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 in the prior art that the five-piece imaging lens group has serious stray light problems when meeting the telephoto requirements, the present utility model 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 consists of five lenses, and 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 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 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 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.

[0048] The imaging lens set of the present application is composed 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 set to satisfy -2.8 < f2 / f3 < -1.5 and 0 < |f3 / R5| < 0.3, the focal length of the front lens can be adjusted to ensure that the telephoto function is met. However, in this case, the light entering the imaging lens set is easily refracted or reflected at the edge of the structural member, causing serious stray light and affecting the imaging quality. Therefore, by constraining 2.8 mm < D3m / d3m x EP23 < 6.1 mm, the light exiting the second lens and entering the third lens can be effectively controlled, while the number of light rays and energy 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 stray light, and by controlling the interval distance between the image side surface of the second spacer element and the object side surface of the third spacer element along the optical axis direction, the edge thickness of the third lens can not be too thick, effectively reducing the energy of the stray light spot, and further helping to ensure the imaging quality of the imaging lens set.

[0049] In the present application, there is an air gap between any two adjacent lenses among the first to fifth lenses. 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, and 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.

[0050] In addition, as shown in Table 1 and Figure 20 , Figure 21 and Figure 22 , under the premise that the imaging lens set satisfies f2 / f3 = -1.57 and |f3 / R5| = 0.24, when the imaging lens set satisfies D3m / d3m x EP23 = 5.12 mm, the stray light is weaker, Figure 20 a stray light path diagram when the imaging lens set satisfies D3m / d3m x EP23 = 2.1 mm is shown, Figure 21 a stray light path diagram when the imaging lens set satisfies D3m / d3m x EP23 = 6.5 mm is shown. Figure 22 a stray light path diagram when the imaging lens set satisfies D3m / d3m x EP23 = 5.12 mm is shown. Figure 20 , Figure 21 and Figure 22 The bold black solid line represents the light rays.

[0051] As shown in Figures 20 to 22It can be seen that when D3m / d3m x EP23=2.1 mm, the inner diameter of the third spacer element is too large, and the stray light of the outer field of view cannot be blocked, and the stray light is more serious. When D3m / d3m x EP23=6.5 mm, the edge thickness of the third lens is large, so that the incident stray light cannot be reflected multiple times through the edge mechanism position, and the stray light energy is strong. When D3m / d3m x EP23=5.12 mm, the light trend is more balanced, the stray light is weaker, and the performance is best. It can be seen that when D3m / d3m x EP23 is in the range of 2.8 mm to 6.1 mm, the trend of the light incident into the third lens after being emitted from the second lens can be effectively controlled, while the number and energy of the 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 control the edge thickness of the third lens not to be too thick, effectively weaken the energy of the stray light spot, and improve the imaging quality of the imaging lens group.

[0052]

[0053] Table 1

[0054] In the embodiment, the radius of curvature 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 x (D2s 2 -d2s 2 ) / R3 2 <1.5. Controlling the radius of curvature of the object side surface of the second lens can improve the processability of the second lens, reduce the problems of surface deviation, distortion and appearance caused by forming, and improve the production yield of the lens; in addition, controlling the inner diameter of the object side surface of the second spacer element can effectively block the stray light generated by the second lens, avoid stray light, and improve the imaging quality.

[0055] In the embodiment, the interval distance EP34 of the image side surface of the third spacer element to the object side surface of the fourth spacer element along the optical axis direction and the center thickness CT4 of the fourth lens satisfy: 0.6<EP34 / CT4≤1.5. By controlling the condition, the center thickness and the edge thickness of the fourth lens can be in a relatively reasonable range, the risk of weld marks of the fourth lens during forming is reduced, so that the risk of stray light caused by the weld marks is reduced, the cleanliness of imaging is improved, the demolding force of the plastic lens after forming is reduced, the risk of surface deviation from the design curve caused by lens demolding deformation is reduced, and the MTF quality of the imaging lens group is improved.

[0056] In the embodiment, a distance EP23 between an image-side surface of the second spacer element to a subject-side surface of the third spacer element along the optical axis direction and a central thickness CT3 of the third lens satisfy: 1.5 < EP23 / CT3 < 2.0. By controlling the central thickness of the third lens, the appearance impurity problem in the molding process can be reduced; meanwhile, by controlling the central thickness of the third lens, the overall strength of the lens can be ensured, the molding problem caused by the uneven thickness ratio of the lens is avoided, and the deformation problem caused by the excessive local pressure of the lens after assembly is avoided, the field curvature and the on-axis peak value affecting the MTF are avoided.

[0057] In the embodiment, an effective focal length f of the imaging lens group, an entrance pupil diameter EPD of the imaging lens group, and a subject-side inner diameter d0s of the lens barrel satisfy: 19mm < f / EPD x d0s < 24mm. By controlling the conditional formula, the imaging lens group can obtain more light intake, and a clearer shooting effect can be obtained at night.

[0058] In the embodiment, the reflectivity of the first spacer element in the visible light band is less than 3%, a maximum axial thickness CP1 of the first spacer element, an image-side inner diameter d1m of the first spacer element, and a subject-side inner diameter d1s of the first spacer element satisfy: 0 ≤ CP1 / (d1m+d1s) < 0.2. The first spacer element can shield the edge flange structure of the first lens, reduce the risk of internal stray light of the first lens, and by controlling the maximum thickness of the first spacer element, the lens spacing is uniformly distributed along the optical axis direction, and the uniformity of the lens structure is ensured within the design specification, avoiding the case that the lens is sensitive to local pressure, causing the local surface shape to change greatly after assembly, thereby affecting the imaging quality.

[0059] In the embodiment, a maximum radial thickness M at a bearing position of the lens barrel and the fourth lens satisfies: 0.6mm < M < 1.1mm. In this way, the overall wall thickness of the lens barrel is relatively uniform, which is beneficial to the molding of the lens barrel, improves the inner diameter grade precision, and improves the assembly stability.

[0060] In the embodiment, an on-axis distance SAG41 between an intersection of a subject-side surface of the fourth lens and the optical axis and an effective radius vertex of the subject-side surface of the fourth lens and a subject-side outer diameter D4s of the fourth spacer element satisfy: -58 < D4s / SAG41 < 42, and D4s / SAG41 ≠ 0. By controlling the on-axis distance between the intersection of the subject-side surface of the fourth lens and the optical axis and the effective radius vertex of the subject-side surface of the fourth lens, the gate and the lens center of the fourth lens are made as a straight line as possible in the injection molding process, so that the lens molding is more uniform, the risk of weld lines is reduced, and meanwhile, the fourth spacer element can shield the connection step difference generated in the effective diameter edge molding process of the fourth lens, and the stray light yield is improved.

[0061] In the embodiment, the first lens has a positive refractive power, and the object side surface of the first lens is a convex surface; the second lens has a positive refractive power, and the object side surface of the second lens is a convex surface and the image side surface of the second lens is a convex surface; the third lens has a negative refractive power, and the image side surface of the third lens is a concave surface; the fourth lens has a positive refractive power, and the object side surface of the fourth lens is a convex surface and the image side surface of the fourth lens is a convex surface; and the fifth lens has a negative refractive power, and the object side surface of the fifth lens is a convex surface and the image side surface of the fifth lens is a concave surface. By reasonably planning the refractive power and surface shape of each lens, the light path can be ensured to be transmitted according to the designed path, the stability of light transmission can be ensured, the imaging stability can be ensured, and the aberration between lenses can be offset, so that the aberration is reduced, and the field curvature and distortion are optimized.

[0062] In the embodiment, the fourth lens has a positive refractive power, and the object side surface of the fourth lens is a convex surface and the image side surface of the fourth lens is a convex surface; the fourth spacer element has a negative refractive power, and the object side surface of the fourth spacer element is a concave surface and the image side surface of the fourth spacer element is a concave surface. By reasonably planning the refractive power and surface shape of each lens, the light path can be ensured to be transmitted according to the designed path, the stability of light transmission can be ensured, the imaging stability can be ensured, and the aberration between lenses can be offset, so that the aberration is reduced, and the field curvature and distortion are optimized.

[0063] In the embodiment, the first lens has a positive refractive power, and the object side surface of the first lens is a convex surface; the second lens has a positive refractive power, and the object side surface of the second lens is a convex surface and the image side surface of the second lens is a convex surface; the third lens has a negative refractive power, and the image side surface of the third lens is a concave surface; the fourth lens has a positive refractive power, and the object side surface of the fourth lens is a convex surface and the image side surface of the fourth lens is a convex surface; and the fifth lens has a negative refractive power, and the object side surface of the fifth lens is a convex surface and the image side surface of the fifth lens is a concave surface. By reasonably planning the refractive power and surface shape of each lens, the light path can be ensured to be transmitted according to the designed path, the stability of light transmission can be ensured, the imaging stability can be ensured, and the aberration between lenses can be offset, so that the aberration is reduced, and the field curvature and distortion are optimized.

[0064] Optionally, the imaging lens assembly in the embodiment of the present application can be simulated by, for example, ZEMAX, CODEV and the like. In the process of simulation by using software and / or tools such as the above, the surface shape of each lens can be simulated according to the surface shape provided by the software and / or the tool used, and appropriate adjustment can be made.

[0065] In addition, in another optional embodiment of the present application, as Figures 1 to 23As shown, the imaging lens set comprises a lens barrel and a lens set and a spacer element set arranged in the lens barrel, the lens set is composed of five lenses, the five lenses are in order from the object side to the image side: a first lens with positive refractive power, a second lens with positive refractive power, a third lens with negative refractive power, a fourth lens with positive refractive power, and a fifth lens with negative refractive power; the spacer element set comprises 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; the effective focal length f2 of the second lens and the effective focal length f3 of the third lens satisfy: -2.8 < f2 / f3 < -1.5; the effective focal length f3 of the third lens and the radius of curvature R5 of the object side surface of the third lens satisfy: 0 < |f3 / R5| < 0.3; the radius of curvature 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.

[0066] The imaging lens set of the present application is composed of a lens barrel and five lenses and a plurality of spacer elements arranged in the lens barrel, by reasonably arranging the refractive power of the five lenses, the positions of the second and third spacer elements, and setting the imaging lens set to satisfy -2.8 < f2 / f3 < -1.5 and 0 < |f3 / R5| < 0.3, it is beneficial to ensure the focal length of the front lens to be adjusted, so as to ensure that the telephoto function is met. However, in this case, after the light enters the imaging lens set, it is easy to be refracted or reflected at the edge of the structural member, causing serious stray light, which affects 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, the processability of the second lens can be improved, the problems of surface 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.

[0067] Of course, other parameter formulas in the above embodiments can also be included in the present embodiment, which will not be described one by one here.

[0068] In addition, in another optional embodiment of the present application, as Figures 1 to 23As shown, the imaging lens group comprises a lens barrel and 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: a first lens with positive refractive power, a second lens with positive refractive power, a third lens with negative refractive power, a fourth lens with positive refractive power and a fifth lens with negative refractive power; the spacer element group comprises 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, 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, and a fourth spacer element placed on the image side of the fourth lens and partially abutting the image side surface of the fourth lens; the effective focal length f3 of the third lens and the image side inner diameter d3m of the third spacer element satisfy: -1.2 < f3 / d3m < -0.7; the curvature radius R7 of the object side surface of the fourth lens and the object side outer diameter D4s of the fourth spacer element satisfy: 1.8 < R7 / D4s < 30.5.

[0069] The imaging lens group of the present application is composed of a lens barrel and five lenses and a plurality of spacer elements arranged in the lens barrel, by reasonably arranging the refractive power 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 to the third and fourth spacer elements to block edge stray light, thereby weakening the influence of stray light on imaging quality and ensuring imaging quality, while it is also beneficial to ensure the rationality of the surface shape of the fourth lens and the feasibility of processing.

[0070] Of course, the present embodiment can also include other parameter formulas in the above embodiments, which will not be described one by one here.

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

[0072] The imaging lens group in the present application can adopt multiple lenses, for example, five lenses as described above. In the present application, at least one of the mirror surfaces of each lens is a non-spherical mirror surface. The characteristic of the aspherical lens is that the curvature is continuously changed from the center of the lens to the periphery of the lens. Unlike the spherical lens which has a constant curvature from the center of the lens to the periphery of the lens, the aspherical lens has better curvature radius characteristics and has the advantages of improving distortion aberration and improving astigmatism aberration. After using the aspherical lens, the aberration that occurs during imaging can be eliminated as much as possible, thereby improving the imaging quality.

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

[0074] Figure 1 A size-labeled diagram of an imaging lens group of the present application is shown, Figure 1 The parameters D3m, d3m, D2s, d2s, EP23, EP34, d0s, d1m, d1s, CP1, D4s, M, etc. are marked in the diagram, Figure 23 A size-labeled diagram of an imaging lens group of the present application is shown, Figure 23 The SAG41 is marked in the diagram for clear and intuitive understanding of the meaning of the parameter. In order to facilitate the description of the imaging lens group and the surface shape of the specific lens, the parameters are no longer embodied in the diagram when the specific embodiments are described below.

[0075] The specific surface shape and parameters of the imaging lens group applicable to the above embodiments are further described below with reference to the accompanying drawings.

[0076] It should be noted that there are three examples of embodiment 1-1, embodiment 1-2, embodiment 1-3 in the following embodiment one, there are three examples of embodiment 2-1, embodiment 2-2, embodiment 2-3 in the embodiment two, and there are three examples of embodiment 3-1, embodiment 3-2, embodiment 3-3 in the embodiment three. The curvature radii, central thicknesses, etc. of the first to fifth lenses of the imaging lens groups in the three examples in the same embodiment are the same, but the thicknesses, inner diameters and outer diameters of the lens barrels, the first to fourth spacer elements, and the shapes of some lenses are different. Or, the main structure for imaging is the same, and the auxiliary structure for imaging is different.

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

[0078] Embodiment one

[0079] As shown in Figures 2 to 7 , the imaging lens group of embodiment one is described. Figure 2 A structure diagram of the imaging lens group of embodiment 1-1 is shown, Figure 3 A structure diagram of the imaging lens group of embodiment 1-2 is shown, Figure 4 A structure diagram of the imaging lens group of embodiment 1-3 is shown.

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

[0081] As shown in Figure 2 , it is a structural schematic diagram of the imaging lens group of embodiment 1-1. In this example, two first auxiliary spacers are arranged on the image side of the first spacer P1. The object side surface and the image side surface of the first spacer P1 respectively abut against the image side surface S2 of the first lens and the object side surface of the auxiliary assembly composed of two first auxiliary spacers, and the image side surface of the auxiliary assembly partially abuts against the object side surface S3 of the second lens. The object side surface and the image side surface of the second spacer P2 respectively partially abut against the image side surface S4 of the second lens and the object side surface S5 of the third lens. The object side surface and the image side surface of the third spacer P3 respectively partially abut against the image side surface S6 of the third lens and the object side surface S7 of the fourth lens. The object side surface and the image side surface of the fourth spacer P4 respectively partially abut against the image side surface S8 of the fourth lens and the object side surface S9 of the fifth lens.

[0082] As shown in Figure 3 , it is a structural schematic diagram of the imaging lens group of embodiment 1-2. The difference between this example and embodiment 1-1 is that a third auxiliary spacer is arranged on the image side of the third spacer P3, and no first auxiliary spacer is arranged. The object side surface and the image side surface of the first spacer P1 respectively partially abut against the image side surface S2 of the first lens and the object side surface S3 of the second lens. The object side surface and the image side surface of the third spacer P3 respectively partially abut against the image side surface S6 of the third lens and the object side surface of the third auxiliary spacer, and the image side surface of the third auxiliary spacer partially abuts against the object side surface S7 of the fourth lens. The abutting modes of the remaining spacers are the same as those of embodiment 1-1, and the relevant descriptions in embodiment 1-1 can be referred to, which will not be described herein.

[0083] As shown in Figure 4 , it is a structural schematic diagram of the imaging lens group of embodiment 1-3. The difference between this example and embodiment 1-2 is that a first auxiliary spacer is arranged on the image side of the first spacer P1. The object side surface and the image side surface of the first spacer P1 respectively partially abut against the image side surface S2 of the first lens and the object side surface of the first auxiliary spacer, and the image side surface of the first auxiliary spacer partially abuts against the object side surface S3 of the second lens. The abutting modes of the remaining spacers are the same as those of embodiment 1-2, and the relevant descriptions in embodiment 1-2 can be referred to, which will not be described herein.

[0084] In summary, the structure parameters of the imaging lens set in Example 1 under the conditions of Example 1-1, Example 1-2, and Example 1-3 are as shown in Table 1.

[0085] The structure parameters of the imaging lens set in Example 1 under the conditions of Example 1-1, Example 1-2, and Example 1-3 are as shown in Table 1.

[0086] Parameter \ 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 Example 1, the object side S1 of the first lens is convex, and the image side S2 of the first lens is convex. The object side S3 of the second lens is convex, and the image side S4 of the second lens is convex. The object side S5 of the third lens is concave, and the image side S6 of the third lens is concave. The object side S7 of the fourth lens is convex, and the image side S8 of the fourth lens is convex. The object side S9 of the fifth lens is convex, and the image side S10 of the fifth lens is concave.

[0089] In Example 1, the aperture value Fno of the imaging lens set is 2.0, the effective focal length f of the imaging lens set 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 structure parameter table of the imaging lens set in Example 1, wherein the units of the curvature radius and the thickness / distance are millimeters mm.

[0091]

[0092] Table 3

[0093] In Example 1, the object side and the image side of the first lens E1 to the fifth lens E5 are aspherical surfaces, and the surface type of each aspherical lens can be defined by the following aspherical surface formula, but is not limited thereto:

[0094]

[0095] wherein x is the distance sag of the aspherical surface at a height of h along the optical axis direction from the vertex of the aspherical surface; c is the paraxial curvature of the aspherical surface, c = 1 / R, i.e., the paraxial curvature c is the inverse of the curvature radius R in Table 1 above; k is the conic coefficient; and Ai is the correction coefficient of the i-th order of the aspherical surface. Table 4 below shows the high-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, A30 that can be used for the aspherical surfaces s1-s10s in Example 1.

[0096]

[0097]

[0098] Table 4

[0099] Figure 5 An axial chromatic aberration curve of the imaging lens set of embodiment one is shown, which represents the convergence point deviation of light rays of different wavelengths after passing through the imaging lens set. Figure 6 An astigmatism curve of the imaging lens set of embodiment one is shown, which represents the meridional image curvature and sagittal image curvature. Figure 7 A distortion curve of the imaging lens set of embodiment one is shown, which represents the distortion size values corresponding to different field angles.

[0100] According to Figures 5 to 7 It can be known that the imaging lens set provided by embodiment one can achieve good imaging quality.

[0101] Embodiment two

[0102] As Figures 8 to 13 shown, the imaging lens set of embodiment two is described. Figure 8 A structure diagram of the imaging lens set of embodiment 2-1 is shown, Figure 9 A structure diagram of the imaging lens set of embodiment 2-2 is shown, Figure 10 A structure diagram of the imaging lens set of embodiment 2-3 is shown.

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

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

[0105] As Figure 9Fig. 2-2 is a structural schematic diagram of the imaging lens set of Example 2-2. The difference between this example and Example 2-1 is that a first auxiliary spacer element is arranged on the image side of the first spacer element P1. The object side surface and the image side surface of the first spacer element P1 respectively abut 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 partially abuts against the object side surface S3 of the second lens. The abutting modes of the remaining spacer elements are the same as those in Example 2-1, and reference can be made to the relevant description in Example 2-1, which will not be repeated here.

[0106] As shown in Fig. 2-3, it is a structural schematic diagram of the imaging lens set of Example 2-3. The abutting modes of the spacer elements in this example are the same as those in Example 2-2, and reference can be made to the relevant description in Example 2-2, which will not be repeated here. Figure 10

[0107] In summary, the structural parameters of the imaging lens set in Example 2 under Examples 2-1, 2-2 and 2-3 are shown in Table 6.

[0108] Table 5 shows the basic structural parameters of the imaging lens set in Example 2, wherein the units of the radius of curvature and the thickness / distance are millimeters (mm).

[0109] Parameter \ 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 Example 2, 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 concave, 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.

[0112] In Example 2, the aperture value Fno of the imaging lens set is 1.7, the effective focal length f of the imaging lens set 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 set in Example 2, wherein the units of the radius of curvature and the thickness / distance are millimeters (mm).

[0114]

[0115]

[0116] Table 6​

[0117] The following Table 7 shows the high order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, A30 of each aspherical mirror s1-s10s used in Example Two.

[0118] Face No. 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 No. 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] Figure 11 The on-axis chromatic aberration curve of the imaging lens set of Example Two is shown, which represents the convergence focus deviation of light rays of different wavelengths after passing through the imaging lens set. Figure 12 The astigmatism curve of the imaging lens set of Example Two is shown, which represents the meridional image surface curvature and sagittal image surface curvature. Figure 13 The distortion curve of the imaging lens set of Example Two is shown, which represents the distortion size values corresponding to different field angles.

[0121] According to Figures 11 to 13 It can be seen that the imaging lens set given in Example Two can achieve good imaging quality.

[0122] Example Three

[0123] As shown in Figures 14 to 19 , the imaging lens set of Example Three is described. Figure 14 The structural schematic diagram of the imaging lens set of Example 3-1 is shown, Figure 15 The structural schematic diagram of the imaging lens set of Example 3-2 is shown, Figure 16 The structural schematic diagram of the imaging lens set of Example 3-3 is shown.

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

[0125] As shown in Figure 14The diagram shows a schematic representation of the imaging lens group in Embodiment 3-1. In this example, the object-side and image-side surfaces of the first spacer element P1 abut against the image-side surface S2 of the first lens and the object-side surface S3 of the second lens, respectively. The object-side and image-side surfaces of the second spacer element P2 abut against the image-side surface S4 of the second lens and the object-side surface S5 of the third lens, respectively. The object-side and image-side surfaces of the third spacer element P3 abut against the image-side surface S6 of the third lens and the object-side surface S7 of the fourth lens, respectively. The object-side and image-side surfaces of the fourth spacer element P4 abut against the image-side surface S8 of the fourth lens and the object-side surface S9 of the fifth lens, respectively.

[0126] like Figure 15 The diagram shown is a schematic representation of the imaging lens assembly in Embodiment 3-2. In this example, the contact method between the spacer elements is the same as in Embodiment 3-1, and can be found in the relevant description in Embodiment 3-1, which will not be repeated here.

[0127] like Figure 16 The diagram shown is a schematic representation of the imaging lens group in Embodiment 3-3. The difference between this example and Embodiment 3-1 is that a third auxiliary spacer element is provided on the image side of the third spacer element P3. The object side and image side of the third auxiliary spacer element abut against the image side of the third spacer element P3 and the object side S7 of the fourth lens, respectively. The abutment and contact methods of the remaining spacer elements are the same as in Embodiment 3-1, and can be found in the relevant description in Embodiment 3-1, which will not be repeated here.

[0128] In summary, the structural parameters of the imaging lens group in Embodiment 3 under Embodiments 3-1, 3-2, and 3-3 are as follows:

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

[0130] Parameter \ 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 Embodiment 3, 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 embodiment three, the aperture value Fno of the imaging lens set is 1.7, the effective focal length f of the imaging lens set is 15.85mm, the effective focal length f1 of the first lens is 20.45mm, the effective focal length f2 of the second lens is 15.50mm, the effective focal length f3 of the third lens is -9.86mm, the effective focal length f4 of the fourth lens is 24.05mm, and the effective focal length f5 of the fifth lens is -35.69mm.

[0134] Table 9 shows the basic structure parameter table of the imaging lens set of embodiment three, wherein the units of the radius of curvature, thickness / distance are millimeter mm.

[0135]

[0136] Table 9

[0137] The following table 10 gives the high order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, A30 of the non-spherical mirrors s1-s10s that can be used in embodiment three.

[0138]

[0139]

[0140] Table 10

[0141] Figure 17 The axial chromatic aberration curve of the imaging lens set of embodiment three is shown, which represents the convergence focal point deviation of light rays of different wavelengths after passing through the imaging lens set. Figure 18 The astigmatism curve of the imaging lens set of embodiment three is shown, which represents the meridional image surface bending and sagittal image surface bending. Figure 19 The distortion curve of the imaging lens set of embodiment three is shown, which represents the distortion size value corresponding to different field angles of view.

[0142] According to Figures 17 to 19 It can be seen that the imaging lens set given in embodiment three can achieve good imaging quality.

[0143] In summary, embodiments one to three respectively satisfy the relationships shown in table 11.

[0144] Conditional Expression \ 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 x EP23 (mm) 2.89 4.34 3.36 6.03 5.74 6.04 5.12 4.62 4.58 π x (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 x 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 x R7 / R8 x 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 length and the like of each lens of the imaging lens set of embodiments one to three.

[0147]

[0148]

[0149] Table 12

[0150] The present application also provides an imaging device, the electronic photosensitive element of which can be a charge coupled device (CCD) or a complementary metal-oxide semiconductor (CMOS). The imaging device can be a stand-alone imaging apparatus such as a digital camera, or an imaging module integrated on 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 application, but not all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative work should belong to the protection scope of the present application.

[0152] It is to be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments consistent with the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and / or "comprising," when used in this specification, specify the presence of stated features, steps, operations, elements, and / or components, but do not preclude the presence or addition of one or more other features, steps, operations, elements, components, and / or groups thereof.

[0153] It should be noted that the terms "first", "second", and the like, used in the specification and the appended claims are intended to distinguish between similar objects, but are not necessarily used to describe a particular sequential or chronological order. It is to be understood that the use of the terms so construed can be interchanged, under appropriate circumstances, to describe the embodiments of the application.

[0154] The preferred embodiments of the present application have been described above with the specific embodiments. The present application is not limited to the above embodiments. It will be appreciated by those skilled in the art that the present application can be varied and changed in many ways. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. An imaging lens group, characterized by, The lens barrel comprises a lens barrel body and a lens group and a spacer element group arranged in the lens barrel body, The lens group is composed of five lenses, which are sequentially a first lens, a second lens, a third lens, a fourth lens and a fifth lens from the object side to the image side. The spacer element group comprises a second spacer element arranged 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 arranged on the image side of the third lens and at least partially in contact with the image side surface of the third lens. The effective focal length f2 of the second lens and the effective focal length f3 of the third lens satisfy: -2.8 < f2 / f3 < -1.

5. The effective focal length f3 of the third lens and the radius of curvature R5 of the object side surface of the third lens satisfy: 0 < |f3 / R5| < 0.

3. 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 of the image side surface of the second spacer element to the object side surface of the third spacer element along the optical axis direction satisfy: 2.8mm < D3m / d3m x EP23 < 6.1mm.

2. The imaging lens set according to claim 1, characterized in that, The radius of curvature 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 x (D2s - d2s) / R3 < 1.

5. 2 - d2s 2 / R3 2 < 1.

5.

3. The imaging lens set according to claim 1, characterized in that, The spacer element group further comprises a fourth spacer element arranged on the image side of the fourth lens and at least partially in contact with the image side surface of the fourth lens, The interval distance EP34 of the image side surface of the third spacer element to the object side surface of the fourth spacer element along the optical axis direction and the central thickness CT4 of the fourth lens satisfy: 0.6 < EP34 / CT4 ≤ 1.

5.

4. The imaging lens set according to claim 1, characterized in that, The interval distance EP23 of the image side surface of the second spacer element to the object side surface of the third spacer element along the optical axis direction and the central thickness CT3 of the third lens satisfy: 1.5 < EP23 / CT3 < 2.

0.

5. The imaging lens set according to claim 1, wherein, 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: 19mm < f / EPD x d0s < 24mm.

6. The imaging lens set according to claim 1, wherein, The spacer element group further comprises a first spacer element arranged on the image side of the first lens and at least partially in contact with the image side surface of the first lens, and 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.

7. The imaging lens set according to claim 1, wherein, The maximum radial thickness M at the abutting position of the lens barrel and the fourth lens satisfies: 0.6mm < M < 1.1mm.

8. The imaging lens set according to claim 1, wherein, The spacer element group further comprises a fourth spacer element arranged on the image side of the fourth lens and at least partially in contact with the image side surface of the fourth lens, The on-axis distance SAG41 between the intersection 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 and the object side outer diameter D4s of the fourth spacer element satisfy: -58 < D4s / SAG41 < 42, and D4s / SAG41 ≠ 0.

9. The imaging lens set according to claim 1, wherein, 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 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 satisfy -60 < R2 / R3 < 8; The maximum axial thickness CP1 of the first spacer element and the air interval T12 of the first lens and the second lens on the optical axis satisfy 0 ≤ CP1 / T12 < 1.

6.

10. The imaging lens set 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 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 outer diameter D4s of the object side of the fourth spacer element satisfy: -471mm < N4 x R7 / R8 x D4s < -32mm.

11. The imaging lens group according to any one of claims 1 to 10, wherein The first lens has a positive refractive power, and the object side surface thereof is a convex surface; The second lens has a positive refractive power, and the object side surface thereof is a convex surface and the image side surface thereof is a convex surface; The third lens has a negative refractive power, and the image side surface thereof is a concave surface; The fourth lens has a positive refractive power, and the object side surface thereof is a convex surface and the image side surface thereof is a convex surface; The fifth lens has a negative refractive power, and the object side surface thereof is a convex surface and the image side surface thereof is a concave surface.

Images