Imaging lens assembly, camera module, and imaging device

Abstract

An imaging lens assembly includes two lenses having positive refractive power; and two lenses having negative refractive power. Among them, the first lens group disposed on the object side is movable integrally in the optical axis direction, the second lens group disposed on the imaging surface side is movable integrally in the optical axis direction and movable relative to the first lens group, and the lens disposed closest to the imaging surface side has an aspherical shape with an inflection point. The overall length, the distance from the lens disposed closest to the imaging surface side to the imaging surface, and the space between the first lens group and the second lens group are configured to change between a shooting state and a lens storage state. Among them, the imaging lens assembly satisfies the following conditional expressions: FB / Yh≥0.5, Ld / Σd≤0.75, GS / ΣLd≥0.06.

Description

Technical Field

[0001] The present disclosure relates to an imaging lens assembly, a camera module, and an imaging device, and more particularly, to an imaging lens assembly, a camera module, and an imaging device that are small and capable of achieving good optical performance. Background Art

[0002] In recent years, portable imaging devices such as mobile phones and digital cameras have been widely used. With the recent miniaturization of imaging devices, the imaging lens assemblies mounted on the imaging devices also need to be miniaturized. In addition, in order to keep up with the improved resolution of the imaging elements mounted on the imaging devices, it is desirable for the imaging lens assemblies to have higher resolution.

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

[0004] However, if the back focus is shortened, an imaging lens assembly such as a foldable imaging lens assembly whose overall length varies between the shooting state and the lens storage state cannot sufficiently shorten its overall length in the lens storage state.

[0005] Therefore, there is room for improvement in conventional imaging lens assemblies from the perspective of being smaller in size and at the same time obtaining good optical performance. Summary of the Invention

[0006] The present disclosure aims to solve at least one of the above technical problems. Therefore, the present disclosure provides an imaging lens assembly, a camera module, and an imaging device.

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

[0008] at least two lenses having positive refractive power; and

[0009] at least two lenses having negative refractive power, wherein

[0010] a first lens group is selected from the lenses having positive refractive power and the lenses having negative refractive power, the first lens group is disposed on the object side and is capable of moving integrally in the optical axis direction,

[0011] a second lens group is selected from the lenses having positive refractive power and the lenses having negative refractive power, the second lens group is disposed on the imaging surface side, and is capable of moving integrally in the optical axis direction and moving relative to the first lens group,

[0012] the lens disposed closest to the imaging surface side has an aspherical shape with an inflection point,

[0013] The overall length of the imaging lens assembly, the distance from the lens closest to the imaging surface side to the imaging surface, and the space between the first lens group and the second lens group are configured to change between a shooting state and a lens storage state, where the overall length of the imaging lens assembly is: the distance on the optical axis from the vertex of the object-side surface of the lens closest to the object side to the imaging surface, and

[0014] The imaging lens assembly satisfies the following conditional expressions in the shooting state:

[0015] FB / Yh≥0.5,

[0016] ΣLd / Σd≤0.75,

[0017] GS / ΣLd≥0.06,

[0018] where FB is the distance from the imaging surface side edge 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 imaging surface side edge of the lens closest to the imaging surface side, Σd is the overall length of the imaging lens assembly, and GS is the distance between the first lens group and the second lens group.

[0019] In one example, the overall length of the imaging lens assembly, the distance from the lens closest to the imaging surface side to the imaging surface, and the space between the first lens group and the second lens group can be shorter in the lens storage state than in the shooting state.

[0020] In one example, the imaging lens assembly can further satisfy the following conditional expressions in the shooting state:

[0021] 0.9<Σd / f<1.2,

[0022] where f is the focal length of the entire optical system.

[0023] In one example, the imaging lens assembly can further satisfy the following conditional expressions:

[0024] -0.8<f1 / f2<0.8,

[0025] where f1 is the focal length of the first lens group and f2 is the focal length of the second lens group.

[0026] In one example, the imaging lens assembly can further satisfy the following conditional expressions:

[0027] 0.9<fs / f<1.9,

[0028] where fs is the combined focal length from the lens closest to the object side to the lens with negative refractive power closest to the object side.

[0029] In one example, the imaging lens assembly may further satisfy the following conditional expression:

[0030] 0.2 < Fno / Yh < 0.9,

[0031] where Fno is the F-number.

[0032] In one example, the lens disposed closest to the imaging surface side may be a lens having a negative refractive power.

[0033] In one example, the surface of the lens disposed closest to the imaging surface side on the imaging surface side may be concave near the optical axis and convex at the peripheral portion.

[0034] In one example, the lens disposed closest to the imaging surface side may be made of plastic.

[0035] According to the present disclosure, a camera module includes:

[0036] an imaging lens assembly; and

[0037] an image sensor including an imaging surface.

[0038] In one example, the camera module may further include an infrared (IR) filter disposed between the imaging lens assembly and the image sensor.

[0039] According to the present disclosure, an imaging device includes:

[0040] a camera module; and

[0041] a housing for storing the imaging lens assembly. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] These and / or other aspects and advantages of the embodiments of the present disclosure will become apparent and more readily understood from the following description with reference to the accompanying drawings, in which:

[0043] Figure 1A is a view of a camera module according to the present disclosure, showing a configuration in which the overall length of the imaging lens assembly changes between a shooting state and a lens storage state.

[0044] Figure 1B is a view of a camera module according to the present disclosure, showing an example of a holder and a lens driving mechanism.

[0045] Figure 2 is a configuration diagram of a camera module according to a first example of the present disclosure;

[0046] Figure 3 is an aberration diagram of a camera module according to a first example of the present disclosure;

[0047] Figure 4 is a configuration diagram of a camera module according to a second example of the present disclosure;

[0048] Figure 5 is an aberration diagram of a camera module according to a second example of the present disclosure;

[0049] Figure 6 is a configuration diagram of a camera module according to a third example of the present disclosure;

[0050] Figure 7 is an aberration diagram of a camera module according to a third example of the present disclosure;

[0051] Figure 8 is a configuration diagram of a camera module according to a fourth example of the present disclosure;

[0052] Figure 9 is an aberration diagram of a camera module according to a fourth example of the present disclosure;

[0053] Figure 10 is a configuration diagram of a camera module according to a fifth example of the present disclosure, and

[0054] Figure 11 is an aberration diagram of a camera module according to a fifth example of the present disclosure. Detailed Description of the Invention

[0055] Embodiments of the present disclosure will now be described in detail, and examples of the embodiments will be shown in the accompanying drawings. Throughout the specification, the same or similar elements and elements having the same or similar functions are denoted by the same reference numerals. The embodiments described herein with reference to the accompanying drawings are illustrative and are intended to explain the present disclosure and should not be construed as limiting the present disclosure.

[0056] <Summary of the Present Disclosure>

[0057] First, the summary of the present disclosure will be described. As Figure 1A shown, the camera module 11 applying the present disclosure is configured to: between a shooting state of shooting (recording as an image) an object (object) and a lens storage state of storing the imaging lens assembly 21 in the housing of the camera module 11, change the total length Σd of the imaging lens assembly 21, the flange ring FB, and the space GS between the first lens group G1 and the second lens group G2 of the imaging lens assembly 21 ( Figure 1A "G" in Figure 1AIn the figure, the dash-dotted line indicates the optical axis of the camera module (the same applies hereinafter). Here, the overall length Σd of the imaging lens assembly 21 is the distance on the optical axis from the vertex of the object-side surface of the lens set closest to the object side to the imaging surface S. The flange gasket FB of the imaging lens assembly 21 is the distance from the edge on the imaging surface S side of the lens set closest to the imaging surface S side to the imaging surface S. In other words, the flange gasket FB is the shortest distance from the surface of the lens set closest to the imaging surface S side to the imaging surface S. Figure 1A ΣLd in the figure is the lens length, and this lens length represents the length of only the lens part of the optical system that constitutes the imaging lens assembly 21 in the optical axis direction. That is, the lens length ΣLd is the distance in the optical axis direction from the vertex of the object-side surface of the lens set closest to the object side to the edge on the imaging surface S side of the lens set closest to the imaging surface S side. When the space GS between the first lens group G1 and the second lens group G2 changes, the lens length ΣLd also changes. The overall length Σd is the sum of the lens length ΣLd and the flange gasket FB.

[0058] The camera module 11 has a shorter overall length Σd, a shorter flange gasket FB, and a shorter space GS between the first lens group G1 and the second lens group G2 in the lens storage state than in the shooting state. For example, when a predetermined user operation to start the shooting mode is performed, the camera module 11 pushes out the imaging lens assembly 21 accommodated in the housing in the direction protruding from the housing by using a lens driving mechanism 24 such as a motor. More specifically, the lens driving mechanism 24 moves the second lens group G2 away from the imaging surface S and moves the first lens group G1 away from the second lens group G2. As a result, the flange gasket FB and the space GS between the first lens group G1 and the second lens group G2 increase, and thus the overall length Σd increases. That is, when the shooting mode starts, the overall length Σd increases in two steps. On the other hand, when a predetermined user operation to end the shooting mode is performed, the camera module 11 retracts the imaging lens assembly 21 by using the lens driving mechanism 24 and stores the imaging lens assembly 21 in the housing. More specifically, the lens driving mechanism 24 moves the second lens group G2 closer to the imaging surface S and moves the first lens group G1 closer to the second lens group G2. As a result, the flange gasket FB and the space GS between the first lens group G1 and the second lens group G2 decrease, and thus the overall length Σd decreases. That is, when the shooting mode ends, the overall length Σd decreases in two steps. Such a camera module 11 is called a collapsible camera module, which has excellent storability and portability when not shooting.

[0059] For example, the camera module 11 applying the present disclosure is configured as shown in Figure 2 , Figure 4 , Figure 6 , Figure 8 and Figure 10 shown.

[0060] The camera module 11 includes an imaging lens assembly 21, a filter 22, and an image sensor 23.

[0061] As described above, the imaging lens assembly 21 is a lens configured such that the overall length Σd, the flange ring FB, and the space GS between the first lens group G1 and the second lens group G2 vary between the shooting state and the lens storage state, and the imaging lens assembly 21 is designed to maintain good optical performance despite its small size.

[0062] The image sensor 23 is, for example, a solid-state image sensor such as a complementary metal oxide semiconductor (CMOS) or a charge-coupled device (CCD). The image sensor 23 has an imaging surface S, which is the imaging surface of the imaging lens 21. The image sensor 23 receives light incident from an object (object side) via the imaging lens assembly 21 and the filter 22, performs photoelectric conversion on the light, and outputs image data obtained by the photoelectric conversion of the light to a subsequent stage. The filter 22 provided between the imaging lens assembly 21 and the image sensor 23 may be, for example, an infrared (IR) filter that cuts off infrared light from the incident light from the imaging lens assembly 21.

[0063] The imaging lens assembly 21 will be described in more detail. The imaging lens assembly 21 includes at least two lenses having positive refractive power and at least two lenses having negative refractive power.

[0064] The first lens group G1, which is located on the object side among the lenses having positive refractive power and the lenses having negative refractive power, is integrally movable in the optical axis direction by a lens driving mechanism 24.

[0065] The second lens group G2, which is located on the side of the imaging surface S among the lenses having positive refractive power and the lenses having negative refractive power, is integrally movable in the optical axis direction by the lens driving mechanism 24 and is movable relative to the first lens group G1 in the optical axis direction.

[0066] As Figure 1B shown, the first lens group G1 can be held in a first lens barrel 251, which is movable in the optical axis direction by the lens driving mechanism 24. The second lens group G2 can be held in a second lens barrel 252, which is movable in the optical axis direction separately from the first lens barrel 251. In Figure 1B it, the lenses included in the imaging lens assembly 21 are shown in a simplified manner. In Figure 1BIn the illustrated example, the first lens barrel 251 and the second lens barrel 252 are disposed within the housing 26. The first lens barrel 251 is movable in the optical axis direction together with the first lens group G1 by means of a deployable member 241, which forms part of the lens driving mechanism 24. The second lens barrel 252 is movable in the optical axis direction together with the second lens group G2 by means of the deployable member 241. The deployable member 241 is driven in the optical axis direction by a motor 242, which forms part of the lens driving mechanism 24. As Figure 1B shown, in the lens storage state, the lens barrel 251, the lens barrel 252, and the imaging lens assembly 21 are stored within the housing 26. In the photographing state, the first lens barrel 251 and the first lens group G1 project toward the object side relative to the housing 26.

[0067] The lens disposed closest to the imaging surface S side has an aspherical shape with an inflection point. Specifically, in Figure 2 the illustrated example, the surface on the imaging surface S side of the lens disposed closest to the imaging surface S side in the second lens group G2 is an aspherical surface having an inflection point near the lens edge. More specifically, the surface on the imaging surface S side of the lens disposed closest to the imaging surface S side in the second lens group G2 is concave near the lens center (i.e., near the optical axis) and convex in the peripheral portion (i.e., near the outer peripheral region). In the photographing state, the ratio of the flange ring FB to the total length Σd is sufficiently large and the ratio of the space GS between the first lens group G1 and the second lens group G2 to the total length Σd is sufficiently large. Since the flange ring FB and the space GS are large in the photographing state, a sufficiently large air gap can be ensured between the first lens group G1 and the second lens group G2 and between the imaging lens assembly 21 and the imaging surface S. When the imaging lens assembly 21 is stored within the housing, the large air gap enables the imaging lens assembly 21 to retract toward the imaging surface S side with a large movement amount.

[0068] The foldable imaging lens assembly 21 includes at least two positive refractive power lenses and at least two negative refractive power lenses, and a large air gap is provided between the first lens group G1 and the second lens group G2 and between the second lens group G2 and the imaging surface S. By adopting such a foldable imaging lens assembly 21, good optical performance can be obtained despite its small size. In addition, since the lens disposed closest to the imaging surface S side has an aspherical shape with an inflection point, good optical performance can be obtained for all image heights.

[0069] In addition, when the camera module 11 satisfies the following equation (1) in the photographing state, the imaging lens assembly 21 can be miniaturized and its good optical performance can be maintained more effectively:

[0070] FB / Yh≥0.5 (1)

[0071] In Equation (1), FB is the flange ring of the above imaging lens assembly 21, which is the distance from the edge on the imaging surface S side of the lens closest to the imaging surface S side in the second lens group G2 to the imaging surface S (the same applies hereinafter). Yh is the image height (the same applies hereinafter).

[0072] As the ratio shown in Equation (1) increases, a larger flange ring B can be obtained while ensuring the size of the image sensor 23. Therefore, the air gap for storing the above imaging lens assembly 21 can be larger. As a result, the imaging lens assembly 21 can be miniaturized and its good optical performance can be maintained more effectively.

[0073] In addition, when the camera module 11 satisfies the following Equation (2) in the shooting state, the imaging lens assembly 21 can be miniaturized and its good optical performance can be maintained more effectively:

[0074] ΣLd / Σd ≤ 0.75 (2)

[0075] In Equation (2), ΣLd is the above lens length, which 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 on the imaging surface S side of the lens closest to the imaging surface S side (the same applies hereinafter). Σd is the total length of the above imaging lens assembly 21, which is the distance on 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 same applies hereinafter).

[0076] As the ratio shown in Equation (2) decreases, the air gap for storing the imaging lens assembly 21 can become larger. As a result, the imaging lens assembly 21 can be miniaturized and its good optical performance can be maintained more effectively.

[0077] In addition, when the camera module 11 satisfies the following Equation (3) in the shooting state, the imaging lens assembly 21 can be miniaturized and its good optical performance can be maintained more effectively:

[0078] GS / ΣLd ≥ 0.06 (3)

[0079] In Equation (3), GS is the space between the above first lens group G1 and the second lens group G2 (the same applies hereinafter).

[0080] As the ratio shown in Equation (3) increases, the air gap for storing the imaging lens assembly 21 can be larger. As a result, the imaging lens assembly 21 can be miniaturized and its good optical performance can be maintained more effectively.

[0081] In addition, 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:

[0082] 0.9 < Σd / f < 1.2 (4)

[0083] In formula (4), f is the focal length of the entire optical system (the same applies hereinafter).

[0084] If the value of Σd / f is lower than the lower limit value of formula (4) (i.e., 0.9), the manufacturability of the imaging lens assembly 21 decreases, and it is difficult to maintain the optical performance. On the other hand, if the value of Σd / f exceeds the upper limit value of formula (4) (i.e., 1.2), it is difficult to miniaturize the imaging lens assembly 21.

[0085] In addition, when the camera module 11 satisfies the following formula (5), the imaging lens assembly 21 can be miniaturized, and the manufacturability of the imaging lens assembly 21 can be effectively maintained:

[0086] -0.8 < f1 / f2 < 0.8 (5)

[0087] In formula (5), f1 is the focal length of the first lens group G1, and f2 is the focal length of the second lens group G2 (the same applies hereinafter).

[0088] If the value of f1 / f2 is lower than the lower limit value of formula (5) (i.e., -0.8), the sensitivity of the decentration error of the second lens group G2 becomes very high, and the difficulty of manufacturing the imaging lens assembly 21 increases. On the other hand, if the value of f1 / f2 exceeds the upper limit value of formula (5) (i.e., 0.8), it is difficult to miniaturize the imaging lens assembly 21.

[0089] In addition, when the camera module 11 satisfies the following formula (6), the manufacturability of the imaging lens assembly 21 and its good optical performance can be effectively maintained:

[0090] 0.9 < fs / f < 1.9 (6)

[0091] In formula (6), fs is the combined focal length from the lens set closest to the object side to the lens with negative refractive power set closest to the object side (the same applies hereinafter).

[0092] If the value of fs / f is lower than the lower limit value of formula (6) (i.e., 0.9), the sensitivity of the decentration error of the second lens group G2 becomes very high, and the difficulty of manufacturing the imaging lens assembly 21 increases. On the other hand, if the value of fs / f exceeds the upper limit value of formula (6) (i.e., 1.9), the spherical aberration is overcorrected, and it is difficult to maintain the optical performance.

[0093] In addition, when the camera module 11 satisfies the following equation (7), the imaging lens assembly 21 can be miniaturized, and the manufacturability of the imaging lens assembly 21 can be effectively maintained:

[0094] 0.2 < Fno / Yh < 0.9 (7)

[0095] In Equation (7), Fno is the F-number (the same applies hereinafter).

[0096] If the value of Fno / Yh is lower than the lower limit value of Equation (7) (i.e., 0.2), it is difficult to miniaturize the imaging lens assembly 21. On the other hand, if the value of Fno / Yh exceeds the upper limit value of Equation (7) (i.e., 0.9), the sensitivity of the decentering error becomes very high, and the difficulty of manufacturing the imaging lens assembly 21 increases.

[0097] In addition, from the perspective of lens formation, it is preferable that the aspherical lens in the imaging lens assembly 21, particularly the aspherical lens having an aspherical shape with an inflection point, is made of a plastic material (glass material). In addition, among the lenses constituting the imaging lens assembly 21, the lens having a size equal to or smaller than a specific size may be a lens formed of a plastic material, and the lens larger than the specific size may be a lens formed of a glass material. This is because it is difficult to form an aspherical lens or a relatively small lens using materials other than plastic materials.

[0098] Such a camera module 11 including the imaging lens assembly 21 is applicable to small digital devices (imaging devices) such as mobile phones, wearable cameras, and surveillance cameras.

[0099] <Configuration Example of Camera Module>

[0100] Next, a more specific example applying the present disclosure will be described. In the following example, "Si" represents the ordinal number of the i-th surface increasing in order from the object side to the imaging surface S side. The optical element of the corresponding surface is shown together with the corresponding surface number "Si". The "first surface" or "surface 1" represents the surface on the object side of the lens, and the "second surface" or "surface 2" represents the surface on the imaging surface S side of the lens. "Ri" represents the value of the central curvature radius of the i-th surface (mm). Regarding "Ri", "E+i" represents an exponential expression with base 10, i.e., "10 i ". For example, "1.00E+18" represents "1.00 × 10 18”. Such an exponential expression is also applicable to the aspherical coefficients described subsequently. “Di” represents the value (mm) of the distance on the optical axis between the i-th surface and the (i + 1)-th surface. “Ndi” represents the refractive index value of the material of the optical element having the i-th surface at the d-line (wavelength 587.6 nm). “νdi” represents the Abbe number value of the material of the optical element having the i-th surface at the d-line.

[0101] The imaging lens assembly 21 used in the following examples includes a lens having an aspherical surface. The aspherical shape of the lens is defined by the following equation (8).

[0102] Z = C × h 2 / {1 + (1 - K × C 2 × h 2 ) 1 / 2}+ ΣAn × h n (8)

[0103] (n = an integer greater than 3).

[0104] In equation (8), Z is the depth of the aspherical surface, C is the paraxial curvature equal to 1 / Ri, h is the distance from the optical axis to the lens surface, K is the eccentricity (second-order aspherical coefficient), and An is the n-th order aspherical coefficient.

[0105] [First Example]

[0106] A first example of applying specific numerical values to the Figure 2 shown camera module 11 will be described.

[0107] In the first example, the imaging lens assembly 21 includes, in order from the object side toward the imaging surface S side, a first lens L1, a second lens L2, a third lens L3, and a fourth lens L4. The first lens L1 has a positive refractive power and its convex surface faces the object side, the second lens L2 has a negative refractive power, the third lens L3 has a positive refractive power, and the fourth lens L4 has a negative refractive power and its concave surface faces the imaging surface S side. The first lens L1 and the second lens L2 belong to the first lens group G1. The third lens L3 and the fourth lens L4 belong to the second lens group G2. The aperture stop 3 is disposed on the first lens group G1 side between the second surface of the second lens L2 and the first surface of the third lens L3.

[0108] Table 1 shows the lens data of the first example. Table 2 shows the focal length of each lens, the focal length of each lens group, and the combined focal length fs from the lens set closest to the object side to the lens with negative refractive power set closest to the object side. In the example of 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 of the entire system, the F-number Fno, the viewing angle 2ω, the overall length ∑d of the imaging lens assembly obtained when photographing an object point at infinity, the lens length ∑Ld, the flange ring FB, the space GS between the first lens group G1 and the second lens group G2, the image height Yh, and the values corresponding to the conditional expressions. Table 4 shows the aspherical coefficients of the imaging lens assembly 21.

[0109] Table 1

[0110] Si Ri Di Nd vd 1 (Virtual surface) 1.00E+10 2 (First surface of L1) 3.802 1.157 1.5346 56.27 3 (Second surface of L1) 177.137 0.060 4 (First surface of L2) 49.338 0.663 1.6349 23.97 5 (Second surface of L2) 9.432 0.183 6 (Aperture stop) 1.00E+18 1.900 7 (First surface of L3) -110.690 0.904 1.6349 23.97 8 (Second surface of L3) -12.372 0.575 9 (First surface of L4) 6.032 1.004 1.5346 56.27 10 (Second surface of L4) 2.867 4.019 11 (Filter) 1.00E+18 0.210 1.5168 64.20 12 (Image plane) 0.263

[0111] Table 2

[0112] Lens Focal length L1 7.22 L2 -18.31 L3 21.65 L4 -11.45 f1 10.64 f2 -29.90 fs 10.64

[0113] Table 3

[0114] f 11.10 Fno 2.79 2ω 38.90 ∑d 10.94 ΣLd 6.76 FB 4.18 GS 1.70 Yh 4.00 FB / Yh 1.04 ∑Ld / ∑d 0.62 GS / ∑Ld 0.25 ∑d / f 0.99 f1 / f2 -0.36 fs / f 0.96 Fno / Yh 0.70

[0115] Table 4

[0116]

[0117]

[0118]

[0119] Figure 3 shows the aberrations in the first example. Figure 3 Shows spherical aberration, astigmatism (field curvature), and distortion as examples of aberrations. Each of these aberration diagrams shows the aberration with the d-line (587.56 nm) as the reference wavelength. In the spherical aberration diagram, the aberration with respect to the g-line (435.84 nm) and the C-line (656.27 nm) is also shown. In the diagram showing astigmatism, "S" represents the aberration value on the sagittal image plane, and "T" represents the aberration value on the tangential image plane. "IMG HT" represents the image height. This also applies to the aberration diagrams in other examples.

[0120] From Figure 3 the aberration diagrams, it can be seen that obviously, although the size of the camera module 11 in the first example is small, it can still satisfactorily correct various aberrations to obtain excellent optical performance.

[0121] [Second example]

[0122] The following will describe applying specific numerical values to Figure 4Second example of the camera module 11 shown.

[0123] In the second example, the imaging lens assembly 21 includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6 in order from the object side toward the imaging surface S side. The first lens L1 has a positive refractive power and a convex surface facing the object side, the second lens L2 has a negative refractive power and a concave surface facing the imaging surface S side, the third lens L3 has a positive refractive power and a convex surface facing the object side, the fourth lens L4 has a negative refractive power, the fifth lens L5 has a positive refractive power, and the sixth lens L6 has a negative refractive power and a concave surface facing the imaging surface S side. The first lens L1 and the second lens L2 belong to the first lens group G1. The third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 belong to the second lens group G2. The aperture stop 3 is disposed on the imaging surface S side with respect to the vertex of the first surface of the first lens L1, and on the object side with respect to the second surface of the first lens L1.

[0124] Table 5 shows the lens data of the second example. Table 6 shows the focal length of each lens, the focal length of each lens group, and the combined focal length fs from the lens set closest to the object side to the lens with negative refractive power set closest to the object side. In the example of 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 of the entire system, the F-number Fno, the viewing angle 2ω, the overall length Σd of the imaging lens assembly obtained when photographing an object point at infinity, the lens length ΣLd, the flange gasket FB, the space GS between the first lens group G1 and the second lens group G2, the image height Yh, and the value corresponding to the conditional expression. Table 8 shows the aspherical coefficients of the imaging lens assembly 21.

[0125] Table 5

[0126] Si Ri Di Nd vd 1 (Virtual surface) 1.00E+10 2 (Aperture stop) 1.00E+18 -0.438 3 (First surface of L1) 5.６10 1.９55 1.5439 56.07 4 (Second surface of L1) -94.781 0.100 5 (First surface of L2) 61.836 0.343 1.6349 23.97 6 (Second surface of L2) 8.061 0.761 7 (First surface of L3) 6.799 1.169 1.5350 55.73 8 (Second surface of L3) 18.309 1.356 9 (First surface of L4) -13.118 0.731 1.6349 23.９7 10 (Second surface of L4) -22.484 0.６86 11 (First surface of L5) 32.344 0.898 1.６349 23.97 12 (Second surface of L5) -111.815 1.102 13 (First surface of L6) 3.558 0.777 1.5350 55.73 14 (Second surface of L6) 2.467 3.６94 15 (Filter) 1.00E+18 0.220 1.5168 64.20 16 (Image plane) 0.300

[0127] Table 6

[0128] Lens Focal length L1 9.82 L2 -14.６3 L3 19.56 L4 -51.15 L5 39.６1 L6 -20.04 f1 22.６4 f2 43.20 fs 22.６4

[0129] Table 7

[0130] f 13.01 Fno 2.08 2ω 23.30 ∑d 14.09 ∑Ld 10.41 FB 3.68 GS 0.76 Yh 5.80 FB / Yh 0.63 ∑Ld / ∑d 0.74 GS / ∑Ld 0.07 ∑d / f 1.08 f1 / f2 0.52 fs / f 1.74 Fno / Yh 0.36

[0131] Table 8

[0132]

[0133]

[0134]

[0135] Figure 5Shows the aberration in the second example. From Figure 5 the aberration diagram, it can be seen that, obviously, although the camera module 11 in the second example is small in size, it can still satisfactorily correct various aberrations to obtain excellent optical performance.

[0136] [Third Example]

[0137] Next, a third example applying specific numerical values to the Figure 6 shown camera module 11 will be described.

[0138] In the third example, the imaging lens assembly 21 includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, and a fifth lens L5 in order from the object side toward the imaging surface S side. The first lens L1 has a positive refractive power and its convex surface faces the object side, the second lens L2 has a negative refractive power and its concave surface faces the imaging surface S, the third lens L3 has a positive refractive power and its convex surface faces the object side, the fourth lens L4 has a negative refractive power and its concave surface faces the imaging surface S side, and the fifth lens L5 has a negative refractive power and its concave surface faces the imaging surface S side. The first lens L1, the second lens L2, and the third lens L3 belong to the first lens group G1. The fourth lens L4 and the fifth lens L5 belong to the second lens group G2. The aperture stop 3 is disposed on the imaging surface S side with respect to the vertex of the first surface of the first lens L1 and on the object side with respect to the second surface of the first lens L1.

[0139] Table 9 shows the lens data of the third example. Table 10 shows the focal length of each lens, the focal length of each lens group, and the combined focal length fs from the lens set closest to the object side to the lens with a negative refractive power set closest to the object side. In the example of 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 of the entire system, the F-number Fno, the viewing angle 2ω, the overall length ∑d of the imaging lens assembly obtained when photographing an object point at infinity, the lens length ∑Ld, the flange back FB, the space GS between the first lens group G1 and the second lens group G2, the image height Yh, and the value corresponding to the conditional expression. Table 12 shows the aspherical coefficients of the imaging lens assembly 21.

[0140] Table 9

[0141] Si Ri Di Nd vd 1 (Virtual surface) 1.00E+10 2 (Aperture stop) 1.00E+18 -0.3478 3 (First surface of L1) 4.553 1.428 1.544 56.07 4 (Second surface of L1) -66.086 0.093 5 (First surface of L2) 64.635 0.464 1.635 23.97 6 (Second surface of L2) 6.307 0.598 7 (First surface of L3) 5.393 0.985 1.535 55.73 8 (Second surface of L3) 12.571 1.985 9 (First surface of L4) -18.498 0.892 1.635 23.97 10 (Second surface of L4) -12.595 0.788 11 (First surface of L5) 2.904 0.６72 1.535 55.73 12 (Second surface of L5) 1.990 2.９63 13 (Filter) 1.00E+18 0.210 1.517 64.20 14 (Image plane) 0.300

[0142] Table 10

[0143] Lens Focal length L1 7.90 L2 -11.04 L3 16.87 L4 58.72 L5 -15.92 f1 9.99 f2 -22.67 fs 19.78

[0144] Table 11

[0145] f 10.66 Fno 2.24 2ω 45.26 ∑d 11.38 ∑Ld 8.31 FB 3.07 GS 1.00 Yh 4.60 FB / Yh 0.67 ∑Ld / ∑d 0.73 GS / ∑Ld 0.12 ∑d / f 1.07 f1 / f2 -0.44 fs / f 1.85 Fno / Yh 0.49

[0146] Table 12

[0147]

[0148]

[0149]

[0150] Figure 7 Shows the aberration in the third example. From Figure 7 the aberration diagram, it can be seen that, obviously, although the camera module 11 in the third example is small in size, it can still satisfactorily correct various aberrations to obtain excellent optical performance.

[0151] [Fourth Example]

[0152] Next, a fourth example of applying specific numerical values to the Figure 8 shown camera module 11 will be described.

[0153] In the fourth example, the imaging lens assembly 21 includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, and a fifth lens L5 in order from the object side toward the imaging surface S side. The first lens L1 has a positive refractive power and its convex surface faces the object side, the second lens L2 has a negative refractive power and its concave surface faces the imaging surface S side, the third lens L3 has a positive refractive power, the fourth lens L4 has a positive refractive power, and the fifth lens L5 has a negative refractive power and its concave surface faces the imaging surface S side. The first lens L1 and the second lens L2 belong to the first lens group G1. The third lens L3, the fourth lens L4, and the fifth lens L5 belong to the second lens group G2. The aperture stop 3 is disposed on the imaging surface S side with respect to the vertex of the first surface of the first lens L1, and on the object side with respect to the second surface of the first lens L1.

[0154] Table 13 shows the lens data of the fourth example. Table 14 shows the focal length of each lens, the focal length of each lens group, and the combined focal length fs from the lens set closest to the object side to the lens with negative refractive power set closest to the object side. In the example of 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 of the entire system, the F-number Fno, the viewing angle 2ω, the overall length ∑d of the imaging lens assembly obtained when photographing an object point at infinity, the lens length ∑Ld, the flange back FB, the space GS between the first lens group G1 and the second lens group G2, the image height Yh, and the value corresponding to the conditional expression. Table 16 shows the aspherical coefficients of the imaging lens assembly 21.

[0155] Table 13

[0156]

[0157] Table 14

[0158] Lens Focal length L1 8.16 L2 -12.80 L3 66.67 L4 101.08 L5 -37.88 f1 16.53 f2 1287.84 fs 16.53

[0159] Table 15

[0160] f 13.89 Fno 2.40 2ω 43.96 ∑d 14.01 ∑Ld 9.23 FB 4.78 GS 1.13 Yh 5.80 FB / Yh 0.82 ∑Ld / ∑d 0.66 GS / ∑Ld 0.12 ∑d / f 1.01 f1 / f2 0.01 fs / f 1.19 Fno / Yh 0.41

[0161] Table 16

[0162]

[0163]

[0164] Figure 9 Shows the aberration in the fourth example. From Figure 9 the aberration diagram, it can be seen that, obviously, although the camera module 11 in the fourth example is small in size, it can still satisfactorily correct various aberrations to obtain excellent optical performance.

[0165] [Fifth Example]

[0166] Next, the fifth example of applying specific numerical values to the Figure 10 shown camera module 11 will be described.

[0167] In the fifth example, the imaging lens assembly 21 includes, in order from the object side toward the imaging surface S side, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6. The first lens L1 has a positive refractive power and a convex surface facing the object side, the second lens L2 has a negative refractive power and a concave surface facing the imaging surface S side, the third lens L3 has a positive refractive power and a convex surface facing the object side, the fourth lens L4 has a negative refractive power, the fifth lens L5 has a positive refractive power, and the sixth lens L6 has a negative refractive power and a concave surface facing the imaging surface S side. The first lens L1 and the second lens L2 belong to the first lens group G1. The third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 belong to the second lens group G2. The aperture stop 3 is disposed on the imaging surface S side with respect to the vertex of the first surface of the first lens L1 and on the object side with respect to the second surface of the first lens L1.

[0168] Table 17 shows the lens data of the fifth example. Table 18 shows the focal length of each lens, the focal length of each lens group, and the combined focal length fs from the lens set closest to the object side to the lens with negative refractive power set closest to the object side. In the example of 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 of the entire system, the F-number Fno, the viewing angle 2ω, the overall length Σd of the imaging lens assembly obtained when photographing an object point at infinity, the lens length ΣLd, the flange ring FB, the space GS between the first lens group G1 and the second lens group G2, the image height Yh, and the value corresponding to the conditional expression. Table 20 shows the aspherical coefficients of the imaging lens assembly 21.

[0169] Table 17

[0170] Si Ri Di Nd vd 1 (Virtual surface) 1.00E+10 2 (Aperture stop) 1.00E+18 -0.300 3 (First surface of L1) 4.006 1.418 1.5439 56.07 4 (Second surface of L1) -30.597 0.080 5 (First surface of L2) 159.085 0.400 1.6349 23.97 6 (Second surface of L2) 5.907 0.535 7 (First surface of L3) 4.459 0.800 1.5350 55.73 8 (Second surface of L3) 10.613 0.879 9 (First surface of L4) -12.797 0.500 1.6349 23.97 10 (Second surface of L4) -24.255 0.429 11 (First surface of L5) 46.285 0.570 1.6349 23.97 12 (Second surface of L5) -23.390 0.632 13 (First surface of L6) 2.586 0.566 1.5350 55.73 14 (Second surface of L6) 1.740 2.305 15 (Filter) 1.00E+18 0.210 1.5168 64.20 16 (Image plane) 0.335

[0171] Table 18

[0172] Lens Focal length L1 6.59 L2 -9.58 L3 13.71 L4 -42.99 L5 24.31 L6 -12.93 f1 15.22 f2 27.23 fs 15.22

[0173] Table 19

[0174] f 8.72 Fno 2.04 2ω 47.4 ∑d 9.66 ∑Ld 7.13 FB 2.53 GS 0.53 Yh 4.00 FB / Yh 0.63 ∑Ld / ∑d 0.74 GS / ∑Ld 0.08 ∑d / f 1.11 f1 / f2 0.56 fs / f 1.74 Fno / Yh 0.51

[0175] Table 20

[0176]

[0177]

[0178]

[0179] Figure 11 shows the aberration in the fifth example. From Figure 11 the aberration diagram in it can be seen that obviously, although the size of the camera module 11 in the fifth example is small, it can still satisfactorily correct various aberrations to obtain good optical performance.

[0180] In the description of the embodiments of the present disclosure, it should be understood that terms such as "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "back", "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 accompanying drawings under discussion. These relative terms are only used to simplify the description of the present disclosure and do not represent or imply that the devices or elements mentioned must have a specific direction, or must be constructed or operated in a specific direction. Therefore, these terms should not be construed as limiting the present disclosure.

[0181] In addition, terms such as "first" and "second" are used in this application for descriptive purposes and are not intended to indicate or imply relative importance or significance, or to imply the number of the technical features indicated. Therefore, the features defined as "first" and "second" may include one or more of such features. In the description of the present disclosure, "a plurality of" means "two or more" unless otherwise specified.

[0182] In the description of the embodiments of the present disclosure, unless otherwise specified or limited, terms such as "mounted", "connected", "coupled", etc. are broad and may be, for example, fixedly connected, detachably connected or integrally connected; they may also be mechanically connected or electrically connected; they may also be directly connected or indirectly connected through an intermediate structure; they may also be the internal connection of two elements that can be understood by those skilled in the art according to specific circumstances.

[0183] In the embodiments of the present disclosure, unless otherwise specified or limited, the structure where the first feature is "on" or "under" the second feature may include embodiments where the first feature is in direct contact with the second feature, and may also include embodiments where the first feature and the second feature are not in direct contact with each other, but are in contact through additional features formed between them. In addition, the first feature being "above", "over" or "on top of" the second feature may include the following embodiments: the first feature is orthogonally or obliquely "above", "over" or "on top of" the second feature, or simply means that the height of the first feature is higher than the height of the second feature; while the first feature being "below", "beneath" or "at the bottom of" the second feature may include the following embodiments: the first feature is orthogonally or obliquely "below", "beneath" or "at the bottom of" the second feature, or simply means that the height of the first feature is lower than the height of the second feature.

[0184] In the above description, various embodiments and examples are provided to implement different structures of the present disclosure. To simplify the present disclosure, certain elements and settings are described above. However, these elements and settings are only examples and are not intended to limit the present disclosure. In addition, in different examples of the present disclosure, reference numerals and / or reference letters may be repeated. Such repetition is for the purpose of simplification and clarity and does not refer to the relationship between different embodiments and / or settings. In addition, examples of different processes and materials are provided in the present disclosure. However, those skilled in the art will understand that other processes and / or materials may also be applied.

[0185] Throughout the specification, references to "embodiments", "some embodiments", "exemplary embodiments", "examples", "specific examples", or "some examples" mean that the particular features, structures, materials, or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the present disclosure. Thus, the appearances of the above phrases throughout this specification are not necessarily referring to the same embodiment or example of the present disclosure. Additionally, the particular features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0186] Any process or method described in a flowchart or otherwise herein can be understood to include one or more modules, segments, or portions of code of executable instructions for implementing specific logical functions or steps in the process, and the scope of the preferred embodiments of the present disclosure includes other implementations. Those skilled in the art should understand that these functions can be implemented in an order different from that shown or discussed, including in substantially the same order or the reverse order.

[0187] The logic and / or steps described otherwise herein or shown in a flowchart, for example, a specific sequence list of executable instructions for implementing a logical function, can be embodied specifically in any computer-readable medium (such as a computer-based system, a system including a processor, or other systems capable of obtaining instructions from an instruction execution system, apparatus, and device that execute instructions), or used in conjunction with an instruction execution system, apparatus, and device. For the purposes of this specification, a "computer-readable medium" can be any device that adaptively includes, stores, transmits, propagates, or transports a program for use by or in connection with an instruction execution system, apparatus, or device. More specific examples of a computer-readable medium include, but are not limited to: an electrical connection having one or more wires (electronic device), a portable computer accessory (magnetic device), random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber devices, and portable compact disc read-only memory (CDROM). Additionally, a computer-readable medium can even be paper or other suitable media on which a program can be printed, because, for example, when the program needs to be obtained electronically, the paper or other suitable media can be optically scanned, and then edited, decrypted, or processed by other suitable methods, and then the program can be stored in a computer memory.

[0188] It should be understood that each part of the present 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 a memory and executed by an appropriate instruction execution system. For example, if implemented by hardware, 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 with logic gate circuits for implementing data signal logic functions, application-specific integrated circuits with appropriate combinational logic gate circuits, programmable gate arrays (PGAs), field programmable gate arrays (FPGAs), etc.

[0189] Those skilled in the art should understand that all or part of the steps in the above exemplary methods of the present disclosure can be implemented by using hardware related to program instructions. These programs can be stored in a computer-readable storage medium, and when run on a computer, these programs include one or a combination of the steps in the method embodiments of the present disclosure.

[0190] In addition, each functional unit in the embodiments of the present 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 the form of hardware or in the form of a software functional module. When the integrated module is implemented in the form of a software functional module and sold or used as an independent product, the integrated module can be stored in a computer-readable storage medium.

[0191] The above storage medium can be a read-only memory, a disk, a CD, etc.

[0192] Although the embodiments of the present disclosure have been shown and described, those skilled in the art should understand that these embodiments are illustrative and should not be construed as limiting the present disclosure. Changes, modifications, substitutions, and variations can 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; And At least two lenses with negative refractive power, where A first lens group is selected from the lenses with positive refractive power and the lenses with negative refractive power. The first lens group is disposed on the object side and can move integrally in the optical axis direction. A second lens group is selected from the lenses with positive refractive power and the lenses with negative refractive power. The second lens group is disposed on the imaging surface side, can move integrally in the optical axis direction, and can move relative to the first lens group in the optical axis direction. The lens disposed closest to the imaging surface side has an aspherical shape with an inflection point. The overall length of the imaging lens assembly, the distance from the lens disposed closest to the imaging surface side to the imaging surface, and the space between the first lens group and the second lens group are configured to change between a shooting state and a lens storage state. Here, the overall length of the imaging lens assembly is: the distance from the vertex of the object-side surface of the lens disposed closest to the object side to the optical axis on the imaging surface, and The imaging lens assembly satisfies the following conditional expressions in the shooting state: FB / Yh≥0.5, ΣLd / Σd≤0.75, GS / ΣLd≥0.06, 0.9<fs / f<1.9, where FB is the distance from the imaging surface-side edge of the lens disposed 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 disposed closest to the object side to the imaging surface-side edge of the lens disposed closest to the imaging surface side, Σd is the overall length of the imaging lens assembly, GS is the space between the first lens group and the second lens group, fs is the combined focal length from the lens disposed closest to the object side to the lens with negative refractive power disposed closest to the object side, and f is the focal length of the entire optical system.

2. The imaging lens assembly according to claim 1, wherein, The overall length of the imaging lens assembly, the distance from the lens disposed closest to the imaging surface side to the imaging surface, and the space between the first lens group and the second lens group are shorter in the lens storage state than in the shooting state.

3. The imaging lens assembly according to claim 1 or 2, wherein, The imaging lens assembly further satisfies the following conditional expression in the shooting state: 0.9<Σd / f<1.

2.

4. The imaging lens assembly according to claim 1 or 2, wherein, The imaging lens assembly further satisfies the following conditional expression: -0.8<f1 / f2<0.8, where f1 is the focal length of the first lens group and f2 is the focal length of the second lens group.

5. The imaging lens assembly according to claim 1 or 2, wherein, The imaging lens assembly further satisfies the following conditional expression: 0.2 / mm<Fno / Yh<0.9 / mm, where Fno is the F-number.

6. The imaging lens assembly according to claim 1 or 2, wherein, The lens disposed closest to the imaging surface side is a lens with negative refractive power.

7. The imaging lens assembly according to claim 1 or 2, wherein The surface of the lens disposed closest to the imaging surface side on the imaging surface side is concave near the optical axis and convex in the peripheral part.

8. The imaging lens assembly according to claim 1 or 2, wherein, The lens disposed closest to the imaging surface side is made of plastic.

9. A camera module, comprising: The imaging lens assembly according to any one of claims 1-8; And An image sensor including an imaging surface.

10. The camera module according to claim 9 further includes an infrared filter disposed between the imaging lens assembly and the image sensor.

11. An imaging device includes: The camera module according to any one of claims 9 and 10; and a housing for storing the imaging lens assembly.

Images