Imaging lens assembly, camera module and imaging device

Abstract

An imaging lens assembly (21) includes a lens with positive refractive power, a lens with negative refractive power, and an aperture stop (3) between a lens positioned closest to the object and a lens positioned closest to the imaging surface, wherein the total length and the distance from the lens positioned closest to the imaging surface to the imaging surface (S) vary between a shooting state and a lens storage state, and νd < 25.0, FB / Yh ≥ 1.4, ΣLd / Σd ≤ 0.75, where νd is the Abbe number of the lens positioned closest to the imaging surface, FB is the distance from the edge of the imaging surface side of the lens positioned closest to the imaging surface to the imaging surface, Yh is the image height, ΣLd is the distance from the vertex of the object-side surface of the lens positioned closest to the object to the edge of the imaging surface side of the lens positioned closest to the imaging surface, and Σd is the total length.

Description

Technical Field

[0001] This disclosure relates to imaging lenses, camera modules, and imaging devices, and more specifically, to small imaging lenses, camera modules, and imaging devices capable of achieving good optical performance. Background Technology

[0002] In recent years, portable imaging devices such as mobile phones and digital cameras have been widely used. With the miniaturization of these devices, the imaging lens assemblies mounted on them also need to be miniaturized. Furthermore, to keep pace with the improved resolution of the imaging elements mounted on these devices, higher resolution imaging lens assemblies are desired.

[0003] To reduce the size of the imaging lens assembly, the back focal length of the imaging lens assembly is usually shortened in order to shorten the overall length of the imaging lens assembly.

[0004] However, if the back focal length is shortened, the overall length of the imaging lens assembly (e.g., a foldable imaging lens assembly) that changes between the shooting state and the lens storage state cannot be sufficiently shortened in the lens storage state.

[0005] Therefore, in order to achieve good optical performance, improvements are still needed to improve upon the traditional imaging lens assembly, despite its small size. Summary of the Invention

[0006] This disclosure aims to solve at least one of the aforementioned technical problems. Therefore, this disclosure requires providing an imaging lens assembly, a camera module, and an imaging device.

[0007] According to this disclosure, the imaging lens assembly includes:

[0008] At least two lenses with positive refractive power;

[0009] At least two lenses with negative refractive power; and

[0010] An aperture stop is positioned between the lens closest to the object and the lens closest to the imaging surface.

[0011] The overall length of the imaging lens assembly and the distance from the lens closest to the imaging surface to the imaging surface are configured to change between the shooting state and the lens storage state. The overall length of the imaging lens assembly is the distance along the optical axis from the vertex of the object-side surface of the lens closest to the object to the imaging surface.

[0012] The imaging lens assembly satisfies the following conditional expression during shooting:

[0013] νd<25.0,

[0014] FB / Yh≥1.4,

[0015] ΣLd / Σd≤0.75,

[0016] Wherein, νd is the Abbe number of the material of the lens closest to the imaging surface, FB is the distance from the edge of the imaging surface of the lens closest to the imaging surface to the imaging surface, Yh is the image height, ΣLd is the distance along the optical axis from the vertex of the object-side surface of the lens closest to the object to the edge of the imaging surface of the lens closest to the imaging surface, and Σd is the total length of the imaging lens assembly.

[0017] In one example, the overall length of the imaging lens assembly and the distance from the lens closest to the imaging surface to the imaging surface can be shorter in the lens storage state than in the shooting state.

[0018] In one example, the imaging lens assembly can also satisfy the following conditional expression during shooting:

[0019] 0.9 < Σd / f < 1.5,

[0020] Where f is the focal length of the entire optical system.

[0021] In one example, the imaging lens assembly may further satisfy the following conditional expression:

[0022] fs / f<-1.0,

[0023] Where fs is the combined focal length of the lens from the lens closest to the object to the negative refractive power lens closest to the object.

[0024] In one example, the imaging lens assembly may further satisfy the following conditional expression:

[0025] 0.5 <Fno / Yh<1.4,

[0026] Where Fno is the F-number.

[0027] In one example, the second lens from the imaging surface side can be a lens with negative refractive power.

[0028] In one example, the surface on one side of the imaging surface of the second lens may be concave.

[0029] In one example, the lens positioned closest to the imaging surface can be made of plastic.

[0030] According to this disclosure, a camera module includes:

[0031] Imaging lens assembly; and

[0032] Image sensors, including imaging surfaces.

[0033] In one example, the camera module may also include an IR filter positioned between the imaging lens assembly and the image sensor.

[0034] According to this disclosure, an imaging device includes:

[0035] Camera module; and

[0036] A housing used to store imaging lens components. Attached Figure Description

[0037] The foregoing and other aspects and advantages of the embodiments of this application will become clearer and more readily understood, taking into account the accompanying drawings and the following detailed description, in which:

[0038] Figure 1 The diagram of the camera module according to this disclosure shows a configuration in which the overall length of the imaging lens assembly changes between a shooting state and a lens storage state.

[0039] Figure 2 The diagram of the camera module according to this disclosure shows an example of a bracket and lens drive mechanism.

[0040] Figure 3 It is a configuration diagram of a camera module according to the first example of this disclosure;

[0041] Figure 4 It is an aberration diagram of a camera module according to the first example of this disclosure;

[0042] Figure 5 This is a configuration diagram of a camera module according to the second example of this disclosure;

[0043] Figure 6 It is an aberration diagram of a camera module according to the second example of this disclosure;

[0044] Figure 7 It is a configuration diagram of the camera module according to the third example of this disclosure;

[0045] Figure 8 It is an aberration map of a camera module according to the third example of this disclosure;

[0046] Figure 9 It is a configuration diagram of the camera module according to the fourth example of this disclosure;

[0047] Figure 10 It is an aberration map of a camera module according to the fourth example of this disclosure;

[0048] Figure 11 It is a configuration diagram of the camera module according to the fifth example of this disclosure, and

[0049] Figure 12It is an aberration map of a camera module according to the fifth example of this disclosure. Detailed Implementation

[0050] Embodiments of this disclosure will now be described in detail, and examples of these embodiments will be illustrated in the accompanying drawings. Throughout the specification, the same or similar elements, as well as elements having the same or similar functions, are denoted by the same reference numerals. The embodiments described in this disclosure with reference to the accompanying drawings are illustrative and intended to explain this disclosure, and should not be construed as limiting this disclosure.

[0051] [Public Summary]

[0052] First, a summary of this disclosure will be described. For example... Figure 1 As shown, the camera module 11 of this disclosure is configured to change the total length Σd and flange distance FB of the imaging lens assembly 21 between a shooting state (recording as an image) and a lens storage state, in which the imaging lens assembly 21 is stored in the housing of the camera module 11. Figure 1 In the diagram, the dashed line represents the optical axis of the camera module (the same applies below). Here, the total length Σd of the imaging lens assembly 21 is the distance along the optical axis from the vertex of the object-side surface of the lens closest to the object side to the imaging surface S. The flange distance FB of the imaging lens assembly 21 is the distance from the edge of the imaging surface S side of the lens closest to the imaging surface S to the imaging surface S. In other words, the flange distance FB is the shortest distance from the lens surface closest to the imaging surface S to the imaging surface S. Figure 1 In this context, ΣLd represents the lens length, specifically the length of the lens portion of the optical system constituting the imaging lens assembly 21 along the optical axis. That is, the lens length ΣLd is the distance along the optical axis from the vertex of the object-side surface of the lens closest to the object to the edge of the imaging surface S of the lens closest to the imaging surface S. The total length Σd is the sum of the lens length ΣLd and the flange distance FB.

[0053] The camera module 11 has a shorter overall length Σd and a shorter flange distance FB in the lens-stored state compared to the shooting state. For example, when performing a predetermined user operation to start the shooting mode, the camera module 11 uses a lens drive mechanism 24, such as a motor, to push the imaging lens assembly 21, which is mounted in the housing, outward from the housing. On the other hand, when performing a predetermined user operation to end the shooting mode, the camera module 11 uses the lens drive mechanism 24 to retract the imaging lens assembly 21 and store it in the housing. Such a camera module 11 is called a foldable camera module, which has excellent storage and portability when not shooting.

[0054] like Figure 2As shown, the imaging lens assembly 21 can be held within the lens barrel 25, which is movable along the optical axis, by means of the lens drive mechanism 24. Figure 2 The image shows a lens included in the imaging lens assembly 21 in a simplified manner. Figure 2 In the example shown, the lens barrel 25 is disposed inside the housing 26 and is movable along the optical axis direction together with the imaging lens assembly 21 via an extendable member 241 that forms part of the lens drive mechanism 24. The extendable member 241 is driven along the optical axis direction by a motor 242 that forms part of the lens drive mechanism 24. Figure 2 As shown, the lens barrel 25 and the imaging lens assembly 21 are stored inside the housing 26 in the lens storage state, and protrude toward the object side relative to the housing 26 in the shooting state.

[0055] For example, the camera module 11 using this disclosure is configured as follows: Figure 3 , Figure 5 , Figure 7 , Figure 9 and Figure 11 As shown.

[0056] The camera module 11 includes an imaging lens assembly 21, an optical filter 22, and an image sensor 23.

[0057] As described above, the imaging lens assembly 21 is configured such that the total length Σd and the flange distance FB vary between the shooting state and the lens storage state, and is designed to maintain good optical performance despite its small size.

[0058] Image sensor 23, for example, is a solid-state image sensor such as complementary metal-oxide-semiconductor (CMOS) or charge-coupled device (CCD). Image sensor 23 has an imaging surface S, which is the imaging surface of imaging lens assembly 21. Image sensor 23 receives light incident from the object (object side) via imaging lens assembly 21 and optical filter 22, performs photoelectric conversion on the light, and outputs the image data obtained from the photoelectric conversion to subsequent stages. Optical filter 22, disposed between imaging lens assembly 21 and image sensor 23, may be, for example, an IR (infrared) filter that cuts off infrared light from the incident light from imaging lens assembly 21.

[0059] The imaging lens assembly 21 will be described in more detail below. The imaging lens assembly 21 includes at least two lenses with positive refractive power and at least two lenses with negative refractive power. An aperture stop 3 is disposed between the lens closest to the object side and the lens closest to the imaging surface S side. That is, the aperture stop 3 is disposed inside the lens structure. The lens closest to the imaging surface S side is formed of a material with a low Abbe number. The second lens, starting from the imaging surface S side, has negative refractive power and is immediately adjacent to the lens closest to the imaging surface S side. The surface of the second lens on one side of the imaging surface is concave. In the shooting state, the ratio of the flange distance FB to the total length Σd is sufficiently large. Because the flange distance FB is large in the shooting state, a sufficiently large air gap can be ensured between the imaging lens assembly 21 and the imaging surface S. When the imaging lens assembly 21 is stored in the housing 26, the large air gap allows the imaging lens assembly 21 to retract back to the imaging surface S side with a large movement.

[0060] By employing such a foldable imaging lens assembly 21, which includes at least two positive refractive power lenses and at least two negative refractive power lenses, and has a large air gap between the imaging lens assembly 21 and the imaging surface S, good optical performance can be obtained despite its small size. Furthermore, since the aperture stop 3 is positioned between the lens closest to the object side and the lens closest to the imaging surface S, and the lens closest to the imaging surface S is formed of a material with a low Abbe number, good optical performance can be obtained for all image heights.

[0061] Furthermore, when the camera module 11 satisfies the following formula (1), the imaging lens assembly 21 can be miniaturized and its good optical performance can be maintained more effectively:

[0062] νd<25.0 (I)

[0063] In formula (1), νd is the Abbe number of the material of the lens that is set closest to the imaging surface.

[0064] When the value shown in formula (1) decreases, the imaging lens assembly 21 can be miniaturized and its good optical performance can be maintained more effectively.

[0065] Furthermore, when the camera module 11 satisfies the following formula (2) in the shooting state, the imaging lens assembly 21 can be miniaturized and its good optical performance can be maintained more effectively:

[0066] FB / Yh≥1.4 (2)

[0067] In formula (2), FB is the flange distance of the imaging lens assembly 21, which is the distance from the edge of the imaging surface S side of the lens closest to the imaging surface S side to the imaging surface S (the same applies below). Yh is the image height (the same applies below).

[0068] When the ratio shown in formula (2) is increased, a larger flange distance B can be obtained while ensuring the size of the image sensor 23. Therefore, the air gap for storing the imaging lens assembly 21 can be larger, so the imaging lens assembly 21 can be miniaturized and its good optical performance can be maintained more effectively.

[0069] Furthermore, when the camera module 11 satisfies the following formula (3) in the shooting state, the imaging lens assembly 21 can be miniaturized and its good optical performance can be maintained more effectively:

[0070] ΣLd / Σd≤0.75 (3)

[0071] In formula (3), ΣLd is the length of the lens, which is the distance along the optical axis from the vertex of the object-side surface of the lens closest to the object to the edge of the imaging surface S of the lens closest to the imaging surface S (the same applies below). Σd is the total length of the imaging lens assembly 21, which is the distance along the optical axis from the vertex of the object-side surface of the lens closest to the object to the imaging surface S (the same applies below).

[0072] As the ratio shown in formula (3) decreases, the air gap for storing the imaging lens assembly 21 can be increased, so the imaging lens assembly 21 can be miniaturized and its good optical performance can be maintained more effectively.

[0073] Furthermore, when the camera module 11 satisfies the following formula (4) in the shooting state, the imaging lens assembly 21 can be miniaturized and its good optical performance can be maintained more effectively:

[0074] 0.9 < Σd / f < 1.5 (4)

[0075] In formula (4), f is the focal length of the entire optical system of camera module 11 (the same applies below).

[0076] If the value of Σd / f is lower than the lower limit of Equation (4) (i.e., 0.9), the manufacturability of the imaging lens assembly 21 is reduced, and it is difficult to maintain optical performance. On the other hand, if the value of Σd / f exceeds the upper limit of Equation (4) (i.e., 1.5), it is difficult to miniaturize the imaging lens assembly 21.

[0077] Furthermore, when the camera module 11 satisfies the following formula (5), the imaging lens assembly 21 can be miniaturized and its good optical performance can be maintained more effectively:

[0078] fs / f<-1.0 (5)

[0079] In formula (5), fs is the combined focal length of the lens from the lens closest to the object to the negative refractive power lens closest to the object (the same applies below).

[0080] If the value of fs / f exceeds the upper limit of formula (5), the spherical aberration is overcorrected and it is difficult to maintain optical performance.

[0081] Furthermore, when the camera module 11 satisfies the following formula (6), the imaging lens assembly 21 can be miniaturized, and the manufacturability of the imaging lens assembly 21 can be maintained more effectively:

[0082] 0.5 <Fno / Yh<1.4 (6)

[0083] In formula (6), Fno is the F number (the same applies below).

[0084] If the value of Fno / Yh is lower than the lower limit of formula (6) (i.e., 0.5), it is difficult to miniaturize the imaging lens assembly 21. On the other hand, if the value of Fno / Yh exceeds the upper limit of formula (6) (i.e., 1.4), the sensitivity of the eccentricity error becomes very high, and the difficulty of manufacturing the imaging lens assembly 21 increases.

[0085] Furthermore, considering lens formation, it is preferable that the aspherical lenses in the imaging lens assembly 21, particularly aspherical lenses with an inflection point, are formed of plastic material. Additionally, among the lenses constituting the imaging lens assembly 21, lenses with dimensions equal to or smaller than a specific size can be formed of plastic material, while lenses larger than a specific size can be formed of glass material. This is because it is difficult to form aspherical lenses or relatively small lenses using materials other than plastic.

[0086] This camera module 11, which includes an imaging lens assembly 21, is suitable for small digital devices (imaging devices), such as mobile phones, wearable cameras, and surveillance cameras.

[0087] [Camera Module Configuration Example]

[0088] Next, more specific examples of applying this disclosure will be described. In the following examples, "Si" represents the ordinal number of the i-th surface, increasing sequentially from the object side to the imaging surface S side. The optical elements of the corresponding surfaces are shown together with the corresponding surface number "Si". The designation "first surface" or "surface 1" indicates the object-side surface of the lens, and "second surface" or "surface 2" indicates the surface on the imaging surface S side of the lens. "R" represents the center radius of curvature of the surface (mm). Regarding "R", "E+i" represents an exponential expression with base 10, i.e., "10 i For example, "1.00E+18" means "1.00 × 10". 18 This exponential expression also applies to the aspherical coefficients described later. "Di" represents the distance (mm) along the optical axis between the i-th and (i+1)-th surfaces. "Ndi" represents the refractive index of the material of the optical element with the i-th surface at the d-line (wavelength 587.6 nm). "νdi" represents the Abbe number of the material of the optical element with the i-th surface at the d-line.

[0089] The imaging lens assembly 21 used in the following example includes a lens with an aspherical surface. The aspherical shape of the lens is defined by the following formula (7):

[0090] Z = C × h 2 / {1+(1-K×C 2 ×h 2 ) 1 / 2}+ΣAn×h n (7)

[0091] (n = an integer greater than 3)

[0092] In formula (7), Z is the depth of the aspherical surface, C is the paraxial curvature equal to 1 / R, h is the distance from the optical axis to the lens surface, K is the eccentricity (second-order aspherical coefficient), and An is the nth-order aspherical coefficient.

[0093] [First Example]

[0094] The description applies specific numerical values. Figure 3 The first example of camera module 11 shown.

[0095] In the first example, the imaging lens assembly 21 includes, in order from the object side to the imaging surface S side, a first lens L1 with positive refractive power and convex surface facing the object side, a second lens L2 with negative refractive power and concave surface facing the imaging surface S side, a third lens L3 with positive refractive power and convex surface facing the object side, a fourth lens L4 with positive refractive power and one convex surface facing the object side and the other convex surface facing the imaging surface S side, a fifth lens L5 with negative refractive power, a sixth lens L6 with negative refractive power and one concave surface facing the object side and the other concave surface facing the imaging surface S side, and a seventh lens L7 with positive refractive power and convex surface facing the imaging surface S side. The aperture stop 3 is disposed inside the lens structure.

[0096] Table 1 shows the lens data for the first example. Table 2 shows the focal length of each lens and the combined focal length fs of the lenses from the lens closest to the object to the negative refractive power lens closest to the object. In the example in Table 2, fs is the combined focal length of the first lens L1 and the second lens L2. Table 3 shows the focal length f, F-number Fno, angle of view 2ω, total length Σd of the imaging lens assembly 21 obtained when the object point is photographed at infinity, lens length ΣLd, flange distance FB, image height Yh, and the values ​​corresponding to the conditional expressions for the entire system. Table 4 shows the aspherical coefficients of the imaging lens assembly 21.

[0097] Table 1

[0098] 1 (Virtual Surface) 1.00E+10 2(L1 First Surface) 3.542 0.687 1.5439 56.07 3 (L1 second surface) 4.365 0.025 4 (L2 first surface) 2.843 0.569 1.6503 21.51 5 (L2 second surface) 1.970 0.353 6 (L3 first surface) 3.968 1.100 1.5439 56.07 7 (L3 Second Surface) 52.254 0.127 8 (Aperture Stop) 1.00E+18 0.321 9 (I4 First Surface) 4.233 1.158 1.5350 55.73 10 (L4 Second Surface) -7.335 0.025 11 (L5 First Surface) 4428.468 0.510 1.8503 21.51 12 (L5 Second Surface) 26.794 0.284 13 (L6 First Surface) -5.030 0.284 1.5350 55.73 14 (L6 Second Surface) 4.829 0.496 15 (L7 First Surface) -5.757 1.124 1.6349 23.97 16 (L7 Second Surface) -5.709 3.474 17 (Filter) 1.00E+18 0.140 1.5168 64.20 18 (Image plane) 0.092

[0099] Table 2

[0100] L1 26.72 L2 -13.27 L3 7.84 L4 5.21 L5 -41.45 L6 -4.57 L7 106.62 fs -35.14

[0101] Table 3

[0102] Fno 2.71 2ω 25.99 ∑d 10.77 ∑Ld 7.07 FB 3.71 Yh 2.35 νd 21.51 FB / Yh 1.58 ∑Ld / ∑d 0.66 ∑d / f 1.08 fs / f -3.53 Fno / Yh 1.15

[0103] Table 4

[0104]

[0105]

[0106]

[0107] The aberrations in the first example are as follows: Figure 4 As shown. Figure 4Spherical aberration, astigmatism (field curvature), and distortion are shown as examples of aberrations. Each of these aberration plots shows the aberration with the d-line (587.56 nm) as the reference wavelength. In the spherical aberration plots, aberrations relative to the g-line (435.84 nm) and C-line (656.27 nm) are also shown. In the plots showing astigmatism, "S" represents the aberration value on the sagittal image plane, and "T" represents the aberration value on the meridional image plane. "IMG HT" indicates the image height. This also applies to the aberration plots in the other examples.

[0108] from Figure 4 As can be seen from the aberration diagram, it is clear that the camera module 11 in the first example, despite its small size, can still satisfactorily correct various aberrations to obtain excellent optical performance.

[0109] [Second Example]

[0110] Next, we will describe applying specific values. Figure 5 The second example of camera module 11 shown.

[0111] In the second example, the imaging lens assembly 21 includes, in order from the object side to the imaging surface S side, a first lens L1 with positive refractive power and convex surface facing the object side, a second lens L2 with negative refractive power and concave surface facing the imaging surface S side, a third lens L3 with positive refractive power and convex surface facing the object side, a fourth lens L4 with positive refractive power and one convex surface facing the object side and the other convex surface facing the imaging surface S side, a fifth lens L5 with negative refractive power, a sixth lens L6 with negative refractive power and one concave surface facing the object side and the other concave surface facing the imaging surface S side, and a seventh lens L7 with positive refractive power and convex surface facing the imaging surface S side. The aperture stop 3 is disposed inside the lens structure.

[0112] Table 5 shows the lens data for the second example. Table 6 shows the focal length of each lens and the combined focal length fs of the lens from the lens closest to the object side to the lens with the negative refractive power closest to the object side. In the example in Table 6, fs is the combined focal length of the first lens L1 and the second lens L2. Table 7 shows the focal length f, F-number Fno, angle of view 2ω, total length Σd of the imaging lens assembly 21 obtained when the object point is photographed at infinity, lens length ΣLd, flange distance FB, image height Yh, and the values ​​corresponding to the conditional expressions for the entire system. Table 8 shows the aspherical coefficients of the imaging lens assembly 21.

[0113] Table 5

[0114] 1 (Virtual Surface) 1.00E+10 2(L1 First Surface) 7.197 1.208 1.5439 56.07 3 (L1 second surface) 8.600 0.513 4 (L2 first surface) 4.792 1.000 1.6503 21.51 5 (L2 second surface) 3.327 0.690 6 (L3 first surface) 10.312 1.933 1.5439 56.07 7 (L3 Second Surface) -96.738 0.173 8 (Aperture Stop) 1.00E+18 0.321 9 (L4 first surface) 6.137 1.749 1.5439 56.07 10 (L4 Second Surface) -10.589 0.010 11 (L5 First Surface) 10917.409 1.308 1.6503 21.51 12 (L5 Second Surface) 72.859 0.500 13 (L6 First Surface) -7.186 0.500 1.5439 56.07 14 (L6 Second Surface) 9.326 1.275 15 (L7 First Surface) -19.527 1.200 1.6349 23.97 16 (L7 Second Surface) -18.671 6.324 17 (Filter) 1.00E+18 0.210 1.5168 64.20 18 (Image plane) 0.100

[0115] Table 6

[0116] L1 62.34 L2 -22.90 L3 17.26 L4 7.55 L5 -112.78 L6 -7.52 L7 434.49 fs -43.88

[0117] Table 7

[0118] Fn0 2.78 2ω 26.85 ∑d 19.02 ∑Ld 12.38 FB 6.63 Yh 4.07 νd 23.97 FB / Yh 1.63 ∑Ld / ∑d 0.65 ∑d / f 1.13 fs / f -2.60 Fno / Yh 0.68

[0119] Table 8

[0120]

[0121]

[0122]

[0123] Figure 6 The aberrations in the second example are shown. From Figure 6 As can be seen from the aberration diagram, it is clear that the camera module 11 in the second example, despite its small size, can still satisfactorily correct various aberrations to obtain excellent optical performance.

[0124] [Third Example]

[0125] Next, we will describe applying specific values. Figure 7 The third example of camera module 11 shown.

[0126] In the third example, the imaging lens assembly 21 includes, in order from the object side to the imaging surface S side, a first lens L1 with positive refractive power and convex surface facing the object side, a second lens L2 with negative refractive power and concave surface facing the imaging surface S side, a third lens L3 with positive refractive power and one convex surface facing the object side and the other convex surface facing the imaging surface S side, a fourth lens L4 with positive refractive power and one convex surface facing the object side and the other convex surface facing the imaging surface S side, a fifth lens L5 with negative refractive power, a sixth lens L6 with negative refractive power and one concave surface facing the object side and the other concave surface facing the imaging surface S side, and a seventh lens L7 with positive refractive power. The aperture stop 3 is disposed inside the lens structure.

[0127] Table 9 shows the lens data for the third example. Table 10 shows the focal length of each lens and the combined focal length fs of the lens from the lens closest to the object side to the lens with the negative refractive power closest to the object side. In the example in Table 10, fs is the combined focal length of the first lens L1 and the second lens L2. Table 11 shows the focal length f, F-number Fno, angle of view 2ω, total length ∑d of the imaging lens assembly 21 obtained when the object point is photographed at infinity, lens length ∑Ld, flange distance FB, image height Yh, and the values ​​corresponding to the conditional expressions for the entire system. Table 12 shows the aspherical coefficients of the imaging lens assembly 21.

[0128] Table 9

[0129] 1 (Virtual Surface) 1E+13 2(L1 First Surface) 7.759 1.208 1.5439 56.07 3 (L1 second surface) 9.376 0.586 4 (L2 first surface) 4.791 1.000 1.6503 21.51 5 (L2 second surface) 3.353 1.035 6 (L3 first surface) 12.684 1.933 1.544 56.07 7 (L3 Second Surface) -37.142 0.265 8 (Aperture Stop) 1.00E+18 0.806 9 (L4 first surface) 6.179 1.782 1.544 56.07 10 (L4 Second Surface) -10.504 0.010 11 (L5 First Surface) 14044.949 1.274 1.650 21.51 12 (L5 Second Surface) 51.874 0.500 13 (L6 First Surface) -7.418 0.500 1.544 56.07 14 (L6 Second Surface) 9.672 1.213 15 (L7 First Surface) -24.796 1.200 1.635 23.97 16 (L7 Second Surface) -24.122 6.593 17 (Filter) 1.00E+18 0.242 1.517 64.20 18 (Image plane) 0.100

[0130] Table 10

[0131] L1 65.57 L2 -23.66 L3 17.65 L4 7.57 L5 -80.05 L6 -7.78 L7 826.31 fs -44.39

[0132] Table 11

[0133] Fno 2.82 2ω 26.85 ∑d 20.25 ∑Ld 13.31 FB 6.93 Yh 4.03 νd 23.97 FB / Yh 1.72 ∑Ld / ∑d 0.66 ∑d / f 1.20 fs / f -2.63 Fno / Yh 0.70

[0134] Table 12

[0135]

[0136]

[0137]

[0138] Figure 8 The aberrations in the third example are shown. From Figure 8 As can be seen from the aberration diagram, it is clear that the camera module 11 in the third example, despite its small size, can still satisfactorily correct various aberrations to obtain excellent optical performance.

[0139] [Fourth Example]

[0140] Next, we will describe applying specific values. Figure 9 The fourth example of camera module 11 shown.

[0141] In the fourth example, the imaging lens assembly 21 includes, in order from the object side to the imaging surface S side, a first lens L1 with positive refractive power and convex surface facing the object side, a second lens L2 with negative refractive power and concave surface facing the imaging surface S side, a third lens L3 with positive refractive power and convex surface facing the object side, a fourth lens L4 with positive refractive power and one convex surface facing the object side and the other convex surface facing the imaging surface S side, a fifth lens L5 with negative refractive power, a sixth lens L6 with negative refractive power and one concave surface facing the object side and the other concave surface facing the imaging surface S side, and a seventh lens L7 with negative refractive power. The aperture stop 3 is disposed inside the lens structure.

[0142] Table 13 shows the lens data for the fourth example. Table 14 shows the focal length of each lens and the combined focal length fs of the lens from the lens closest to the object side to the lens with the negative refractive power closest to the object side. In the example in Table 14, fs is the combined focal length of the first lens L1 and the second lens L2. Table 15 shows the focal length f, F-number Fno, angle of view 2ω, total length ∑d of the imaging lens assembly 21 obtained when the object point is photographed at infinity, lens length ∑Ld, flange distance FB, image height Yh, and the values ​​corresponding to the conditional expressions for the entire system. Table 16 shows the aspherical coefficients of the imaging lens assembly 21.

[0143] Table 13

[0144] 1 (Virtual Surface) 1E+13 2(L1 First Surface) 7.024 1.208 1.5439 56.07 3 (L1 second surface) 8.751 0.400 4 (L2 first surface) 4.786 1.000 1.6503 21.51 5 (L2 second surface) 3.332 1.100 6 (L3 first surface) 1.00E+18 0.500 7 (L3 Second Surface) 9.185 1.933 1.544 56.07 8 (Aperture Stop) 1.13E+02 0.993 9 (L4 first surface) 6.178 1.931 1.544 56.07 10 (L4 Second Surface) -10.297 0.010 11 (L5 First Surface) 11897.993 1.161 1.650 21.51 12 (L5 Second Surface) 45.512 0.500 13 (L6 First Surface) -7.698 0.500 1.544 56.07 14 (L6 Second Surface) 9.666 1.013 15 (L7 First Surface) -16.444 1.200 1.635 23.97 16 (L7 Second Surface) -17.633 6.535 17 (Filter) 0.210 1.517 64.20 18 (Image plane) 0.100

[0145] Table 14

[0146] L1 52.56 L2 -23.14 L3 18.28 L4 7.54 L5 -70.25 L6 -7.94 L7 -631.66 fs -52.66

[0147] Table 15

[0148] Fn0 2.83 2ω 26.85 ∑d 20.29 ∑Ld 13.45 FB 6.84 Yh 4.03 νd 23.97 FB / Yh 1.70 ∑Ld / ∑d 0.66 ∑d / f 1.20 fs / f -3.12 Fno / Yh 0.70

[0149] Table 16

[0150]

[0151]

[0152]

[0153] Figure 10 The aberrations in the fourth example are shown. From Figure 10 As can be seen from the aberration diagram, it is clear that the camera module 11 in the fourth example, despite its small size, can still satisfactorily correct various aberrations to obtain excellent optical performance.

[0154] [Fifth Example]

[0155] Next, we will describe applying specific values. Figure 11 The fifth example of camera module 11 shown.

[0156] In the fifth example, the imaging lens assembly 21 includes, in order from the object side to the imaging surface S side, a first lens L1 with positive refractive power and convex surface facing the object side, a second lens L2 with negative refractive power and concave surface facing the imaging surface S side, a third lens L3 with positive refractive power and convex surface facing the object side, a fourth lens L4 with positive refractive power and convex surface facing the object side, a fifth lens L5 with negative refractive power, a sixth lens L6 with negative refractive power, and a seventh lens L7 with positive refractive power and convex surface facing the object side. The aperture stop 3 is disposed inside the lens structure.

[0157] Table 17 shows the lens data for the fifth example. Table 18 shows the focal length of each lens and the combined focal length fs of the lens from the lens closest to the object side to the lens with the negative refractive power closest to the object side. In the example in Table 18, fs is the combined focal length of the first lens L1 and the second lens L2. Table 19 shows the focal length f, F-number Fno, angle of view 2ω, total length ∑d of the imaging lens assembly 21 obtained when the object point is photographed at infinity, lens length ∑Ld, flange distance FB, image height Yh, and the values ​​corresponding to the conditional expressions for the entire system. Table 20 shows the aspherical coefficients of the imaging lens assembly 21.

[0158] Table 17

[0159] 1 (Virtual Surface) 1E+13 2(L1 First Surface) 9.968 1.043 1.5439 56.07216495 3 (L1 second surface) 15.517 1.373 4 (L2 first surface) 5.604 1.530 1.6607 20.36 5 (L2 second surface) 4.099 0.914 6 (L3 first surface) 4.604 1.669 1.544 56.07 7 (L3 Second Surface) 5.613 0.439 8 (Aperture Stop) 1.00E+18 0.395 9 (L4 first surface) 9.898 1.835 1.544 56.07 10 (L4 Second Surface) 88.055 0.500 11 (L5 First Surface) -10.748 1.876 1.661 20.36 12 (L5 Second Surface) -99.214 0.446 13 (L6 First Surface) 13.076 1.382 1.544 56.07 14 (L6 Second Surface) 11.220 2.705 15 (L7 First Surface) 8.647 2.000 1.661 20.36 16 (L7 Second Surface) 13.031 8.668 17 (Filter) 0.210 1.517 64.20 18 (Image plane) 0.100

[0160] Table 18

[0161] L1 48.76 L2 -38.55 L3 30.27 L4 20.62 L5 -18.20 L6 -199.22 L7 32.53 fs -1000.00

[0162] Table 19

[0163] Fno 2.86 2ω 14.00 ∑d 27.09 ∑Ld 18.11 FB 8.98 Yh 2.98 νd 20.36 FB / Yh 3.01 ∑Ld / ∑d 0.67 ∑d / f 1.10 fs / f -40.54 Fno / Yh 0.96

[0164] Table 20

[0165]

[0166]

[0167]

[0168] Figure 12 The aberrations in the fifth example are shown. From Figure 12 As can be seen from the aberration diagram, it is clear that the camera module 11 in the fifth example, despite its small size, can still satisfactorily correct various aberrations to obtain excellent optical performance.

[0169] In the description of embodiments of this disclosure, it should be understood that terms such as “center,” “longitudinal,” “lateral,” “length,” “width,” “thickness,” “upper,” “lower,” “front,” “rear,” “left,” “right,” “vertical,” “horizontal,” “top,” “bottom,” “inner,” “outer,” “clockwise,” and “counterclockwise” should be interpreted as referring to the directions or positions described or shown in the discussed drawings. These relative terms are used only to simplify the description of this disclosure and do not indicate or imply that the mentioned devices or elements must have a particular orientation, or must be constructed or operated in a particular orientation. Therefore, these terms should not be construed as limiting this disclosure.

[0170] Furthermore, terms such as “first” and “second” are used herein for the purpose of description and are not intended to indicate or imply relative importance or significance, or to imply the number of technical features indicated. Therefore, a feature defined as “first” and “second” may include one or more of those features. In the description of this disclosure, “multiple” means “two or more” unless otherwise stated.

[0171] In the description of embodiments of this disclosure, unless otherwise stated or limited, terms such as “installation,” “connection,” and “coupling” are broad and can be, for example, a fixed connection, a detachable connection, or an integral connection; they can also be a mechanical connection or an electrical connection; they can also be a direct connection or an indirect connection through an intermediate structure; or they can be internal communication between two elements that can be understood by those skilled in the art based on the specific circumstances.

[0172] In embodiments of this disclosure, unless otherwise stated or limited, the structure of the first feature "above" or "below" the second feature may include embodiments where the first feature and the second feature are in direct contact, or embodiments where the first feature and the second feature are in contact with each other but not in direct contact, but through an additional feature formed between them. Furthermore, the first feature "above," "on top of," or "on the second feature" may include embodiments where the first feature is orthogonal or obliquely positioned above, above, or "on top of" the second feature, or simply means that the height of the first feature is greater than the height of the second feature; while the first feature "below," "below," or "at the bottom of" the second feature may include embodiments where the first feature is orthogonal or obliquely positioned below, below, or "at the bottom of" the second feature, or simply means that the height of the first feature is less than the height of the second feature.

[0173] Various embodiments and examples are provided in the above description to implement different structures of this disclosure. Certain elements and arrangements have been described above to simplify this disclosure. However, these elements and arrangements are merely examples and are not intended to limit this disclosure. Furthermore, reference numerals and / or reference letters may be repeated in different examples of this disclosure. Such repetition is for simplification and clarity purposes and does not indicate a relationship between different embodiments and / or arrangements. Additionally, examples of different processes and materials are provided in this disclosure. However, those skilled in the art will understand that other processes and / or materials may also be applied.

[0174] Throughout this specification, references to "an embodiment," "some embodiments," "an exemplary embodiment," "an example," "a specific example," or "some examples" refer to a particular feature, structure, material, or characteristic described in connection with an embodiment or example that is included in at least one embodiment or example of this disclosure. Therefore, the appearance of these phrases throughout this specification does not necessarily refer to the same embodiment or example of this disclosure. Furthermore, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0175] Any process or method described in the flowchart or otherwise herein is to be understood as including one or more modules, code segments, or portions of code that are executable instructions for implementing specific logical functions or steps in the process, and the scope of the preferred embodiments of this disclosure includes other implementations. Those skilled in the art will understand that these functions may be implemented in a different order than that shown or discussed, including in substantially the same order or in the reverse order.

[0176] The logic and / or steps otherwise described or illustrated in this disclosure, such as a specific list of executable instructions for implementing logical functions, may be specifically implemented in, or in conjunction with, any computer-readable medium (e.g., a computer-based system, a processor-included system, or other system capable of obtaining instructions from an instruction execution system, device, or apparatus) to be used by, an instruction execution system, device, or apparatus. For the purposes of this specification, "computer-readable medium" can mean any means suitable for including, storing, communicating, propagating, or transmitting programs for use by, or in conjunction with, an instruction execution system, device, or apparatus. More specific examples of computer-readable media include, but are not limited to: electronic connections (electronic devices) having one or more wires, portable computer accessories (magnetic devices), random access memory (RAM), read-only memory (ROM), erasable and programmable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Furthermore, computer-readable media can even be paper or other suitable media on which programs can be printed. For example, paper or other suitable media can be optically scanned and then edited, decrypted or processed by other suitable methods as necessary to obtain the program electronically, and then the program can be stored in computer memory.

[0177] It should be understood that various parts of this disclosure can be implemented by hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented by software or firmware stored in memory and executed by an appropriate instruction execution system. For example, if implemented in hardware, similarly in another embodiment, these steps or methods can be implemented by one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing data signals, application-specific integrated circuits (ASICs) having appropriate combinations of logic gates, programmable gate arrays (PGAs), and field-programmable gate arrays (FPGAs), etc.

[0178] Those skilled in the art will understand that all or part of the steps in the example methods described above can be implemented by program instructions and related hardware. The program can be stored in a computer-readable storage medium, and when the program is run on a computer, it includes one or more steps in the method embodiments of this disclosure.

[0179] Furthermore, the various functional units of the embodiments of this disclosure can be integrated into a processing module, or these units can be separate physical entities, or two or more units can be integrated into a processing module. The integrated module can be implemented in hardware or as a software functional module. When the integrated module is implemented as a software functional module and sold or used as an independent product, the integrated module can be stored in a computer-readable storage medium.

[0180] The aforementioned storage media can be read-only memory, disk, CD, etc.

[0181] Although embodiments of the present disclosure have been shown and described, those skilled in the art will understand that these embodiments are illustrative and should not be construed as limiting the present disclosure. Changes, modifications, substitutions, and variations may be made to the embodiments without departing from the scope of the present disclosure.

Claims

1. An imaging lens assembly, comprising: At least two lenses with positive refractive power; At least two lenses with negative refractive power; as well as An aperture stop is positioned between the lens closest to the object and the lens closest to the imaging surface. The overall length of the imaging lens assembly and the distance from the lens closest to the imaging surface to the imaging surface are configured to change between a shooting state and a lens storage state, wherein the overall length of the imaging lens assembly and the distance from the lens closest to the imaging surface to the imaging surface are shorter in the lens storage state than in the shooting state; the overall length of the imaging lens assembly is the distance along the optical axis from the vertex of the object-side surface of the lens closest to the object to the imaging surface, and... The imaging lens assembly satisfies the following conditional expression during the shooting state to increase the air gap of the imaging lens assembly while ensuring optical performance: 20.36≤νd<25.0, 1.4 ≤ FB / Yh ≤ 1.72, or FB / Yh = 3.

01. 0.65≤ΣLd / Σd≤0.75, Wherein, νd is the Abbe number of the material of the lens closest to the imaging surface, FB is the distance from the edge of the imaging surface side of the lens closest to the imaging surface side to the imaging surface, Yh is the image height, ΣLd is the distance in the optical axis direction from the vertex of the object-side surface of the lens closest to the object side to the edge of the imaging surface side of the lens closest to the imaging surface side, and Σd is the total length of the imaging lens assembly.

2. The imaging lens assembly according to claim 1, wherein, The imaging lens assembly also satisfies the following condition expression during the shooting state: 0.9 < Σd / f < 1.5, Where f is the focal length of the entire optical system.

3. The imaging lens assembly according to claim 1, wherein, The imaging lens assembly also satisfies the following conditional expression: fs / f<-1.0, Wherein, fs is the combined focal length of the lenses from the lens closest to the object to the negative refractive power lens closest to the object.

4. The imaging lens assembly according to claim 1, wherein, The imaging lens assembly also satisfies the following conditional expression: 0.5 <Fno / Yh<1.4, Where Fno is the F-number.

5. The imaging lens assembly according to claim 1, wherein, The second lens, extending from the imaging surface side, is a lens with negative refractive power.

6. The imaging lens assembly according to claim 5, wherein, The surface on one side of the imaging surface of the second lens is concave.

7. The imaging lens assembly according to claim 1, wherein, The lens positioned closest to the imaging surface is made of plastic.

8. A camera module, comprising: The imaging lens assembly according to any one of claims 1-7; as well as An image sensor including the imaging surface.

9. The camera module of claim 8, further comprising an IR filter disposed between the imaging lens assembly and the image sensor.

10. An imaging device, comprising: The camera module according to any one of claims 8 and 9; as well as A housing for storing the imaging lens assembly.

Images