Imaging lens assembly, camera module and imaging device

Abstract

An imaging lens assembly (21) includes a first lens group (311) for short focal length shooting, a second lens group (312) for long focal length shooting, a third lens group (32) for short and long focal length shooting, a first mirror (331) between the first lens group (311) and the third lens group (32), and a second mirror (332) between the second lens group (312) and the third lens group (32). The first lens group (311) and the second lens group (312) change their positions in the optical axis direction between a shooting state and a lens storage state. The first mirror (331) or the second mirror (332) forms an optical path connecting the corresponding lens group and the third lens group (32). The first mirror (331) or the second mirror (332) ensures a storage space for the corresponding lens group.

Description

Technical Field

[0001] This application relates to imaging lens assemblies, camera modules, and imaging devices, and more specifically, to small imaging lens assemblies, camera modules, and imaging devices that can achieve 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. To meet this miniaturization requirement, traditional imaging lens assemblies utilize prisms placed on the object side of the lens group to ensure the focal length of the imaging lens assembly within a limited space.

[0003] However, with conventional imaging lenses, it is difficult to compactly mount multiple collapsible optical systems with different focal lengths. Summary of the Invention

[0004] This application aims to solve at least one of the aforementioned technical problems. Therefore, this application provides an imaging lens assembly, a camera module, and an imaging device.

[0005] According to this application, an imaging lens assembly is disclosed, comprising:

[0006] The first lens group is used for shooting at a short focal length;

[0007] The second lens group is used for shooting at a long focal length;

[0008] The third lens group is used for shooting at the short focal length and the long focal length;

[0009] A first reflecting mirror is located between the first lens group and the third lens group; and

[0010] The second reflecting mirror is located between the second lens group and the third lens group, wherein

[0011] At least one of the first lens group and the second lens group is configured to change its position along the optical axis between a shooting state and a lens retracting state.

[0012] The first or second reflector is configured such that, in the shooting state, it is tilted relative to both the optical axis direction of the corresponding lens group in the first and second lens groups and the optical axis direction of the third lens group, to form an optical path optically connecting the corresponding lens group and the third lens group.

[0013] The first and second reflectors are configured such that, in the lens storage state, the first and second reflectors are substantially perpendicular to the optical axis direction of the corresponding lens group to ensure storage space for the corresponding lens group.

[0014] In one example, the first reflector is configured to, when the shooting state is a short focal length shooting state, form an optical path optically connecting the first lens group and the third lens group by tilting relative to both the optical axis direction of the first lens group and the optical axis direction of the third lens group; and the first reflector is configured to, when the shooting state is a long focal length shooting state, not interfere with the optical path optically connecting the second lens group and the third lens group by keeping the first reflector substantially perpendicular to the optical axis direction of the first lens group.

[0015] According to this application, a camera module is disclosed, comprising:

[0016] The imaging lens assembly; and

[0017] Image sensor, including imaging surface.

[0018] According to this application, an imaging device is disclosed, comprising:

[0019] The camera module; and

[0020] A housing for accommodating the imaging lens assembly. Attached Figure Description

[0021] These and / or other aspects and advantages of the embodiments of this application will become apparent and more readily understood from the following description with reference to the accompanying drawings, wherein:

[0022] Figure 1 The diagram of the camera module according to this application shows a first front lens group and a second front lens group that change their position in the optical axis direction between a shooting state and a lens retracting state, and a first reflector and a second reflector that change their angle relative to the optical axis direction between a shooting state and a lens retracting state.

[0023] Figure 2 The diagram of the camera module according to this application shows a mechanism for changing the position of the first front lens group and the second lens group in the optical axis direction, and a mechanism for changing the angle of the first reflector and the second reflector relative to the optical axis direction.

[0024] Figure 3 This is a configuration diagram of the optical system on the short focal length side of a camera module according to the first example of this application;

[0025] Figure 4 This is a configuration diagram of the optical system on the telephoto side of a camera module according to the first example of this application;

[0026] Figure 5 It is an aberration diagram of the optical system on the short focal length side of the camera module according to the first example of this application;

[0027] Figure 6 It is an aberration diagram of the optical system on the telephoto side of the camera module according to the first example of this application;

[0028] Figure 7 This is a configuration diagram of the optical system on the short focal length side of a camera module according to the second example of this application;

[0029] Figure 8 This is a configuration diagram of the optical system on the telephoto side of a camera module according to the second example of this application;

[0030] Figure 9 It is an aberration diagram of the optical system on the short focal length side of the camera module according to the second example of this application;

[0031] Figure 10 It is an aberration diagram of the optical system on the telephoto side of the camera module according to the second example of this application;

[0032] Figure 11 This is a configuration diagram of the optical system on the short focal length side of the camera module according to the third example of this application;

[0033] Figure 12 This is a configuration diagram of the optical system on the telephoto side of the camera module according to the third example of this application;

[0034] Figure 13 It is an aberration diagram of the optical system on the short focal length side of the camera module according to the third example of this application;

[0035] Figure 14 It is an aberration diagram of the optical system on the telephoto side of the camera module according to the third example of this application;

[0036] Figure 15 This is a configuration diagram of the optical system on the short focal length side of the camera module according to the fourth example of this application;

[0037] Figure 16 This is a configuration diagram of the optical system on the telephoto side of the camera module according to the fourth example of this application;

[0038] Figure 17 It is an aberration diagram of the optical system on the short focal length side in the camera module according to the fourth example of this application;

[0039] Figure 18 It is an aberration diagram of the optical system on the telephoto side of the camera module according to the fourth example of this application;

[0040] Figure 19 This is a configuration diagram of the optical system on the short focal length side of the camera module according to the fifth example of this application;

[0041] Figure 20 This is a configuration diagram of the optical system on the telephoto side of the camera module according to the fifth example of this application;

[0042] Figure 21 It is an aberration map of the optical system on the short focal length side in the camera module according to the fifth example of this application; and

[0043] Figure 22 It is an aberration diagram of the optical system on the telephoto side of the camera module according to the fifth example of this application. Detailed Implementation

[0044] Embodiments of this application will be described in detail, and examples of embodiments will be shown in the accompanying drawings. Throughout the description, 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 herein with reference to the accompanying drawings are illustrative and intended to illustrate this application, but should not be construed as limiting this application.

[0045] summary

[0046] First, a summary of this application will be described. For example... Figure 1 As shown, the camera module 11 applicable to this application is a foldable camera module with a compact configuration, wherein multiple optical systems with different focal lengths partially share their components. Specifically, as Figure 1 As shown, the imaging lens 21 of the camera module 11 includes a first front lens group 311 (i.e., the first lens group) for shooting with short focal length or wide angle, a second front lens group 312 (i.e., the second lens group) for shooting with long focal length or telephoto, and a rear lens group 32 (i.e., the third lens group) for shooting with both short focal length and long focal length. The second front lens group 312 is positioned further away from the imaging surface S than the first front lens group 311.

[0047] The camera module 11 is configured to change the position of the first front lens group 311 and the second front lens group 312 in the optical axis direction between a shooting state and a lens-retracted state. In the shooting state, an object is captured (recorded as an image); in the lens-retracted state, the imaging lens assembly 21 is stored in the housing of the camera module 11. The camera module 11 is also configured to change between the shooting state and the lens-retracted state regardless of whether an optical path is formed connecting the first front lens group 311 and the rear lens group 32, or an optical path is formed connecting the second front lens group 312 and the rear lens group 32. Whether an optical path is formed depends on the angle of the first reflecting mirror 331 disposed between the first front lens group 311 and the rear lens group 32, and the angle of the second reflecting mirror 332 disposed between the second front lens group 312 and the rear lens group 32. The optical axis directions of the first front lens group 311 and the second front lens group 312 are parallel to each other and perpendicular to the optical axis direction of the rear lens group 32. The first reflecting mirror 331 is rotatable about one end 331a on the side of the rear lens group 32 of the first reflecting mirror 331. The second reflecting mirror 332 is rotatable about one end 332a on the side of the rear lens group 32 of the second reflecting mirror 332. Figure 1 In the diagram, the dotted line represents the optical axis of camera module 11 (the same applies below).

[0048] like Figure 1 As shown, the camera module 11 includes a first optical axis OA1 and a second optical axis OA2, wherein the first optical axis OA1 is the optical axis of the optical system on the short focal length side, and the second optical axis OA2 is the optical axis of the optical system on the long focal length side.

[0049] The first optical axis OA1 includes the optical axis OA11 of the first front lens group 311 and the optical axis OA3 of the rear lens group 32. The optical axis OA11 of the first front lens group 311 and the optical axis OA3 of the rear lens group 32 are continuous at the intersection point 331b with the first reflecting mirror 331.

[0050] The second optical axis OA2 includes the optical axis OA21 of the second front lens group 312 and the optical axis OA3 of the rear lens group 32. The optical axis OA21 of the second front lens group 312 and the optical axis OA3 of the rear lens group 32 are continuous at the intersection point 332b with the second reflecting mirror 332.

[0051] At least one of the first front lens group 311 and the second front lens group 312 is configured to change its position in the optical axis direction between the shooting state and the lens storage state.

[0052] The first reflecting mirror 331 or the second reflecting mirror 332 is configured to be tilted relative to both the optical axis direction of the corresponding lens group in the first front lens group 311 and the optical axis direction of the rear lens group 32 in the shooting state. Therefore, the first reflecting mirror 331 or the second reflecting mirror 332 is configured to form an optical path that optically connects the corresponding lens group and the rear lens group 32 in the shooting state.

[0053] The first and second reflecting mirrors 331 are configured to be substantially perpendicular to the optical axis of the corresponding lens group when the lens is stowed. Therefore, the first and second reflecting mirrors 331 are configured to ensure storage space for the corresponding lens group when the lens is stowed.

[0054] More specifically, such as Figure 2 As shown, in the lens-folded state, the first front lens group 311 and the second front lens group 312 are housed within the housing 4. Furthermore, the first reflecting mirror 331 is perpendicular to the optical axis of the first front lens group 311 to ensure sufficient storage space for the first front lens group 311. Similarly, the second reflecting mirror 332 is perpendicular to the optical axis of the second front lens group 312 to ensure sufficient storage space for the second front lens group 312. The first front lens group 311 and the second front lens group 312 are mounted within the lens barrel 26.

[0055] Then, when the predetermined user operation to activate the shooting mode is performed, the camera module 11 switches from the lens-retracted state to the shooting state. For example... Figure 2 As shown, during the transition from the lens-retracted state to the shooting state, the camera module 11 uses the lens drive mechanism 24 to extend the first front lens group 311 and the second front lens group 312 housed in the housing 4 in a direction opposite to that of the first reflector 331 and the second reflector 332. The lens drive mechanism 24 may be an actuator such as a voice coil motor provided in association with each of the first front lens group 311 and the second front lens group 312.

[0056] Furthermore, the camera module 11 drives the first reflector 331 or the second reflector 332 using the reflector driving mechanism 25 to form an optical path that optically connects the first front lens group 311 and the rear lens group 32, or an optical path that optically connects the second front lens group 312 and the rear lens group 32. There may be a time lag between the extension of the first front lens group 311 and the second front lens group 312 and the driving of the first reflector 331 or the second reflector 332.

[0057] More specifically, when the shooting mode is a short focal length shooting mode (i.e., wide-angle shooting), the mirror drive mechanism 25 rotates the first mirror 331 towards the first front lens group 311, and tilts the first mirror 331 relative to both the optical axis direction of the first front lens group 311 and the optical axis direction of the rear lens group 32. Therefore, the optical path formed by the optical connection between the first front lens group 311 and the rear lens group 32 serves as the optical path on the short focal length side. At this time, the mirror drive mechanism 25 keeps the second mirror in a state perpendicular to the optical axis direction of the second front lens group 312.

[0058] When the shooting mode is telephoto (i.e., long-distance shooting), the mirror drive mechanism 25 rotates the second mirror 332 toward the second front lens group 312, and tilts the second mirror 332 relative to both the optical axis of the second front lens group 312 and the optical axis of the rear lens group 32. Therefore, the optical path formed by the optical connection between the second front lens group 312 and the rear lens group 32 becomes the telephoto side optical path. At this time, the mirror drive mechanism 25 keeps the first mirror in a state perpendicular to the optical axis of the first front lens group 311, so as not to interfere with the optical path connecting the second front lens group 312 and the rear lens group 32.

[0059] The mirror drive mechanism 25 may be an actuator such as a motor provided in association with each of the first mirror 331 and the second mirror 332.

[0060] On the other hand, when a predetermined user operation to end the shooting mode is performed, the camera module 11 switches from the shooting state to the lens storage state. During the switch from the shooting state to the lens storage state, the lens drive mechanism 24 retracts the front lens groups 311 and 312 and stores them in the housing 4.

[0061] At this time, the mirror driving mechanism 25 drives the first mirror 331 or the second mirror 332, so that the optical paths of the corresponding front lens group and rear lens group 32 are not formed.

[0062] More specifically, when the camera module 11 switches from a short focal length shooting state to a lens storage state, the mirror drive mechanism 25 rotates the first mirror 331 to the opposite side of the first front lens group 311, so that the first mirror 331 is perpendicular to the optical axis of the first front lens group 311. The first mirror 331 being perpendicular to the optical axis of the first front lens group 311 ensures sufficient storage space for the first front lens group 311.

[0063] When the camera module 11 switches from telephoto shooting mode to lens storage mode, the mirror drive mechanism 25 rotates the second mirror 332 to the opposite side of the second lens group 312, so that the second mirror 332 is perpendicular to the optical axis of the second lens group 312. The second mirror 332 being perpendicular to the optical axis of the second front lens group 312 ensures sufficient storage space for the second front lens group 312.

[0064] This foldable camera module, where the front lens groups 311 and 312 extend from the housing 4 during shooting, offers excellent storage and portability when not in use. Furthermore, by sharing the rear lens group 32 between the optical systems on the short focal length side and the long focal length side, the thickness of the housing 4 and the number of components can be reduced while ensuring focal length flexibility. Additionally, by providing reflectors 331 and 332 that can rotate around one end 331a and 332a between the front lens groups 311 and 312 and the rear lens group 32, the focal length and effective diameter of the imaging lens assembly 21 can be increased, while allowing the front lens groups 311 and 312 to be folded within limited installation space.

[0065] For example, such as Figure 3 , 4 The configurations shown in 7, 8, 11, 12, 15, 16, 19 and 20 are applicable to the camera module 11 of this application.

[0066] The camera module 11 includes an imaging lens assembly 21, a filter 22, and an image sensor 23.

[0067] As described above, the imaging lens assembly 21 is configured to change the position of the front lens groups 311 and 312 in the optical axis direction. The imaging lens assembly 21 is also configured to switch between a short focal length shooting state and a lens retracted state, regardless of whether an optical path connecting the first front lens group 311 and the rear lens group 32 is formed. The imaging lens assembly 21 is also configured to switch between a long focal length shooting state and a lens retracted state, regardless of whether an optical path connecting the second front lens group 312 and the rear lens group 32 is formed. The imaging lens assembly 21 is designed to maintain good optical performance despite its small size.

[0068] For example, image sensor 23 is a solid-state image sensor, such as CMOS (Complementary Metal Oxide Semiconductor) or CCD (Charge Coupled Device). Image sensor 23 has an imaging surface S that serves as the imaging plane of imaging lens assembly 21. Image sensor 23 receives incident light from the object being photographed (object side) through imaging lens assembly 21 and filter 22, performs photoelectric conversion on the light, and outputs the image data obtained through photoelectric conversion to subsequent stages. For example, filter 22 disposed between imaging lens assembly 21 and image sensor 23 can be an IR (infrared) filter that intercepts infrared light from the incident light.

[0069] The imaging lens assembly 21 will be described in more detail. The imaging lens assembly 21 includes an optical system on the short focal length side and an optical system on the long focal length side. The short focal length side optical system includes a first front lens group 311, a rear lens group 32, and a first reflecting mirror 331. The first front lens group 311 includes at least one lens with positive refractive power, the rear lens group 32 includes at least one lens with negative refractive power, and the first reflecting mirror 331 is located between the first front lens group 311 and the rear lens group 32. The long focal length side optical system includes a second lens group 312, a rear lens group 32, and a second reflecting mirror 332. The second lens group 312 includes at least one lens with positive refractive power. The rear lens group 32 is shared with the short focal length side optical system, and the second reflecting mirror 332 is located between the second front lens group 312 and the rear lens group 32. The front lens groups 311 and 312 are configured to change their position in the optical axis direction between the shooting state and the lens storage state, for example, by using the lens driving mechanism 24 described above. The mirrors 331 and 332 are configured to form an optical path connecting the front lens groups 311 and 312 and the rear lens group 32 during the switch from the lens storage state to the shooting state, and are configured to ensure storage space for the front lens groups 311 and 312 during the switch from the shooting state to the lens storage state, for example, by using the mirror driving mechanism 25 described above. The aperture stop 34 is disposed between the lens located on the most object side of the front lens groups 311 and 312 and the corresponding mirror 331 and 332.

[0070] By employing this foldable imaging lens assembly 21, it is possible to change whether the optical path is formed by using mirrors 331 and 332, thereby achieving good optical performance in a smaller size.

[0071] 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:

[0072] (WLG1+TLG1) / (WLG1-TLG1)>-15 (1)

[0073] In formula (1), WLG1 is the focal length of the first front lens group 311 (the same applies below). TLG1 is the focal length of the second front lens group 312 (the same applies below).

[0074] If the value of (WLG1+TLG1) / (WLG1-TLG1) is lower than the lower limit of formula (1), the manufacturability of the imaging lens assembly 21 is reduced and it is difficult to maintain its optical performance.

[0075] 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:

[0076] 3<(∑Wd+∑Td) / (Yh_w+Yh_t)<20 (2)

[0077] In formula (2), ∑Wd is the distance from the vertex of the object-side surface of the lens closest to the object side of the first front lens group 311 to the imaging surface S on the first optical axis OA1 of the imaging lens assembly 21 (the same applies below). That is, ∑Wd is the total length of the imaging lens assembly 21 on the short focal length side. As described above, the first optical axis OA1 includes the optical axis OA11 of the first front lens group 311 and the optical axis OA3 of the rear lens group 32, which are continuous with each other at the intersection point 331b with the first reflecting mirror 331. In formula (2), ∑Td is the distance from the vertex of the object-side surface of the lens closest to the object side of the second front lens group 312 to the imaging surface S on the second optical axis OA2 of the imaging lens assembly 21 (the same applies below). That is, ∑Td is the total length of the imaging lens assembly 21 on the long focal length side. As described above, the second optical axis OA2 includes the optical axis OA21 of the second front lens group 312 and the optical axis of the rear lens group 32, which are continuous with each other at the intersection point 332b with the second reflecting mirror 332. Yh_w is the imaging height on the short focal length side, which is half the length of the diagonal of the imaging surface S (the same applies below). Yh_t is the imaging height on the long focal length side (the same applies below).

[0078] If the value of (∑Wd+∑Td) / (Yh_w+Yh_t) deviates from the range of formula (2), it is difficult to ensure the storage space of the front lens group 311, 312, to make the imaging lens assembly 21 miniaturized, and to maintain its optical performance.

[0079] 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:

[0080] ∑Wd / fw<2.0 (3)

[0081] In formula (3), fw is the focal length of the imaging lens assembly 21 on the short focal length side (the same applies below). That is, fw is the focal length of the optical system on the short focal length side.

[0082] If the value of ∑Wd / fw exceeds the upper limit of formula (3), the manufacturability of the imaging lens assembly 21 is reduced and it is difficult to maintain its optical performance.

[0083] 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:

[0084] ΣTd / ft<2.0 (4)

[0085] In formula (4), ft is the focal length of the imaging lens assembly 21 on the long focal length side (the same applies below). That is, ft is the focal length of the optical system on the long focal length side.

[0086] If the value of ∑Td / ft exceeds the upper limit of formula (4), the manufacturability of the imaging lens assembly 21 is reduced and it is difficult to maintain its optical performance.

[0087] 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:

[0088] WLG1 / fw<2.0 (5)

[0089] If the value of WLG1 / fw exceeds the upper limit of formula (5), it is difficult to ensure the balance of optical performance between the optical system on the short focal length side and the optical system on the long focal length side, thus making it difficult to maintain optical performance.

[0090] Furthermore, when the camera module 11 satisfies the following formula (6), the imaging lens assembly 21 can be miniaturized and its good optical performance can be maintained more effectively:

[0091] WLG1 / LG2<0 (6)

[0092] In formula (6), LG2 is the focal length of the rear lens group 32 (the same applies below).

[0093] If the value of WLG1 / LG2 exceeds the upper limit of formula (6), it is difficult to ensure the balance of optical performance between the optical system on the short focal length side and the optical system on the long focal length side, thus making it difficult to maintain optical performance.

[0094] Furthermore, when the camera module 11 satisfies the following formula (7), the imaging lens assembly 21 can be miniaturized and its good optical performance can be maintained more effectively:

[0095] TLG1 / LG2<0 (7)

[0096] If the value of TLG1 / LG2 exceeds the upper limit of formula (7), it is difficult to ensure the balance of optical performance between the optical system on the short focal length side and the optical system on the long focal length side, thus making it difficult to maintain optical performance.

[0097] Furthermore, when the camera module 11 satisfies the following formula (8) in the shooting state, the imaging lens assembly 21 can be miniaturized and its good optical performance can be maintained more effectively:

[0098] ∑TLd1 / ∑WLd1<2.0 (8)

[0099] In formula (8), ∑TLd1 is the distance from the vertex of the object-side surface of the lens closest to the object side of the second front lens group 312 to the second reflecting mirror 332 on the optical axis OA21 of the second front lens group 312 (the same applies below). ∑WLd1 is the distance from the vertex of the object-side surface of the lens closest to the object side of the first front lens group 311 to the first reflecting mirror 331 on the optical axis OA11 of the first front lens group 311 (the same applies below).

[0100] If the value of ∑TLd1 / ∑WLd1 exceeds the upper limit of formula (8), it is difficult to ensure the storage space of the front lens group 311, 312, making it difficult to miniaturize the imaging lens assembly 21 and maintain its optical performance.

[0101] Furthermore, from the perspective of lens formation, the aspherical lens of the imaging lens assembly 21, particularly the aspherical lens with an inflection point, is preferably formed of a plastic material. Regarding the lenses constituting the imaging lens assembly 21, lenses with dimensions equal to or smaller than a specific size are preferably formed of plastic material, and lenses with dimensions larger than a specific size are preferably formed of glass material. This is because it is difficult to form aspherical lenses or relatively small lenses using materials other than plastic.

[0102] This camera module 11, which includes an imaging lens assembly 21, can be used in compact digital devices (imaging devices), such as mobile phones, wearable cameras, and surveillance cameras.

[0103] <Camera Module Configuration Example>

[0104] Next, more specific examples applicable to this application will be described. In the following examples, “Si” represents the number of the i-th surface, increasing sequentially from the object side to the imaging surface S side. The optical element corresponding to the surface is represented by the corresponding surface number “Si”. “First surface” or “1st surface” represents the object-side surface of the lens, and “second surface” or “2nd surface” represents the imaging surface S-side surface of the lens. “R” represents the value of the central radius of curvature (mm) of the surface. Regarding “R”, “E+i” represents an exponential expression with a base of 10, i.e., “10i”. For example, “1.00E+18” represents “1.00×10¹⁸”. This exponential expression also applies to the aspherical coefficients described below. “Di” represents the distance (mm) between the i-th surface and the (i+1)-th surface on the optical axis. “Ndi” represents the value of the refractive index at the d-line (wavelength of 587.6 nm) of the material of the optical element having the i-th surface. “νdi” represents the Abbe number at the d-line of the material of the optical element having the i-th surface.

[0105] 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 (9):

[0106] Z=C×h2 / {1+(1-K×C2×h2)1 / 2}+ΣAn×hn (9)

[0107] (n = an integer greater than or equal to 3).

[0108] In formula (9), Z is the depth of the aspherical surface, C is the paraxial curvature and C equals 1 / R, h is the distance from the optical axis to the lens surface, K is the conic constant (second-order aspherical coefficient), and An is the nth-order aspherical coefficient.

[0109] [First Example]

[0110] The first example will be described, where a specific value applies. Figure 3 and Figure 4 The camera module 11 shown.

[0111] [Optical system on the short focal length side]

[0112] like Figure 3As shown, in the first example, the short focal length side optical system (i.e., the optical system for wide-angle shooting) in the imaging lens assembly 21 includes, in order from the object side to the imaging surface S side, a first lens L1w belonging to the first front lens group 311 and having positive refractive power with its convex surface facing the object side, a second lens L2w belonging to the first front lens group 311 and having negative refractive power, a first reflecting mirror 331, a third lens L3 belonging to the rear lens group 32 and having positive refractive power with its convex surface facing both the object side and the imaging surface S side, and a fourth lens L4 belonging to the rear lens group 32 and having negative refractive power, wherein the fourth lens L4 has a concave surface facing both the object side and the imaging surface S side. An aperture stop 34 is disposed between the second lens L2w and the first reflecting mirror 331.

[0113] Table 1 shows the lens data for the short focal length side of the first example. The units for lengths or distances shown in the table below are mm. Table 2 shows the focal length of each lens, the focal length WLG1 of the first front lens group 311, and the focal length LG2 of the rear lens group 32. Table 3 shows the focal length fw, F-number Fno, angle of view 2ω, total length ∑Wd of the short focal length side imaging lens assembly 21 when photographing the object point at infinity, distance ∑WLd1 from the vertex of the object-side surface of the lens closest to the object side of the first front lens group 311 to the first reflecting mirror 331 on the optical axis of the first front lens group 311, distance ∑WLd2 from the first reflecting mirror 331 to the imaging surface S on the optical axis of the rear lens group 32, and the imaging height Yh_w on the short focal length side. Table 4 shows the aspherical coefficients of the short focal length side of the imaging lens assembly 21.

[0114]

[0115] Table 4

[0116]

[0117]

[0118] [Optical system on the telephoto side]

[0119] like Figure 4As shown, in the first example, the long focal length side optical system (i.e., the optical system for long-distance shooting) in the imaging lens assembly 21 includes, in order from the object side towards the imaging surface S side, a first lens L1t belonging to the second front lens group 312 with positive refractive power and a convex surface facing the object side, a second lens L2t belonging to the second front lens group 312 with negative refractive power, a second reflecting mirror 332, a third lens L3 belonging to the rear lens group 32 with positive refractive power and a convex surface facing both the object side and the imaging surface S side, and a fourth lens L4 belonging to the rear lens group 32 with negative refractive power, wherein the fourth lens L4 has a concave surface facing both the object side and the imaging surface S side. The third lens L3 and the fourth lens L4 are the same as the lenses in the short focal length side optical system. An aperture stop 34 is disposed between the second lens L2t and the second reflecting mirror 332.

[0120] Table 5 shows the lens data for the long focal length side of the first example. Table 6 shows the focal length of each lens, the focal length TLG1 of the second front lens group 312, and the focal length LG2 of the rear lens group 32. Table 7 shows the focal length ft, F-number Fno, angle of view 2ω, total length ∑Td of the long focal length side imaging lens assembly 21 when the object point is photographed at infinity, the distance ∑TLd1 from the vertex of the object-side surface of the lens closest to the object side of the second front lens group 312 to the second mirror 332 on the optical axis of the second front lens group 312, the distance ∑TLd2 from the second mirror 332 to the imaging surface S on the optical axis of the rear lens group 32, and the imaging height Yh_t on the long focal length side. Table 8 shows the aspherical coefficients of the long focal length side of the imaging lens assembly 21.

[0121]

[0122] Table 8

[0123]

[0124]

[0125] Table 9 shows the values ​​corresponding to the conditional expressions.

[0126] Table 9

[0127] 3<(ΣWd+ΣTd) / (Yh_w+Yh_t)<20 8.75 ΣWd / fw<2.0 1.21 ΣTd / ft<2.0 1.23 WLG1 / fw < 2.0 1.24 WLG1 / LG2<0 -0.29 TLG1 / LG2<0 -0.43 ΣTLd1 / ΣWLd1<2.0 1.01

[0128] exist Figure 5 The image shows the aberrations on the short focal length side in the first example. Figure 5Examples of aberrations are shown, including spherical aberration, astigmatism (field curvature), and distortion. Each of these aberration maps shows the aberration with the d-line (587.56 nm) as the reference wavelength. In the spherical aberration map, aberrations relative to the g-line (435.84 nm) and C-line (656.27 nm) are also shown. In the astigmatism map, "S" represents the aberration value of the sagittal image surface, and "T" represents the aberration value of the tangential image surface. "IMG HT" indicates the imaging height. This also applies to the aberration maps in the other examples.

[0129] exist Figure 6 The image shows the aberrations on the long focal length side in the first example.

[0130] from Figure 5 and Figure 6 As can be seen from the aberration diagram, it is evident that, despite its small size, the camera module 11 in the first example can still satisfactorily correct various aberrations to achieve excellent optical performance.

[0131] [Second Example]

[0132] Next, a second example will be described, where a specific value applies. Figure 7 and Figure 8 The camera module 11 shown.

[0133] [Optical system on the short focal length side]

[0134] Figure 7 An optical system on the short focal length side of the imaging lens assembly 21 according to the second example is shown. Lens parameters similar to those in the first example are as follows...

[0135] As shown in Table 10-13.

[0136]

[0137] Table 13

[0138]

[0139] [Optical system on the telephoto side]

[0140] Figure 8 The optical system on the long focal length side of the imaging lens assembly 21 according to the second example is shown. Lens parameters similar to those in the first example are shown in Tables 14-17.

[0141]

[0142]

[0143]

[0144] Table 18 shows the values ​​corresponding to the conditional expressions.

[0145] Table 18

[0146] 3<(ΣWd+ΣTd) / (Yh_w+Yh_t)<20 10.12 ΣWd / fw<2.0 1.32 ΣTd / ft<2.0 1.32 WLG1 / fw < 2.0 1.37 WLG1 / LG2<0 -0.05 TLG1 / LG2<0 -0.07 ΣTLd1 / ΣWLd1<2.0 0.68

[0147] Figure 9 The image shows the aberrations on the short focal length side in the second example. Figure 10 The image shows the aberrations on the long focal length side in the second example.

[0148] According to the second example, by making the lens parameters of the second example different from those of the first example, the design freedom of the camera module 11 according to this application can be increased, while achieving the same effect as the first example.

[0149] [Third Example]

[0150] Next, the third example will be described, where specific values ​​apply. Figure 11 and 12 The camera module 11 shown is shown.

[0151] [Optical system on the short focal length side]

[0152] Figure 11 The optical system on the short focal length side of the imaging lens assembly 21 according to the third example is shown. Lens parameters similar to those in the first example are shown in Tables 19-22.

[0153]

[0154] Table 22

[0155]

[0156] [Optical system on the telephoto side]

[0157] Figure 12 The optical system on the long focal length side of the imaging lens assembly 21 according to the third example is shown. Lens parameters similar to those in the first example are shown in Tables 23-26.

[0158]

[0159] Table 26

[0160]

[0161]

[0162] Table 27 shows the values ​​corresponding to the conditional expressions.

[0163] Table 27

[0164] 3<(ΣWd+ΣTd) / (Yh_w+Yh_t)<20 9.49 ΣWd / fw<2.0 1.30 ΣTd / ft<2.0 1.32 WLG1 / fw < 2.0 1.37 WLG1 / LG2<0 -0.04 TLG1 / LG2<0 -0.07 ΣTLd1 / ΣWLd1<2.0 0.98

[0165] Figure 13 The image shows the aberrations on the short focal length side in the third example. Figure 14 The image shows the aberrations on the long focal length side in the third example.

[0166] According to the third example, by making the lens parameters of the third example different from those of the first and second examples, the design freedom of the camera module 11 according to this application can be increased, while achieving the same effect as the first example.

[0167] [Fourth Example]

[0168] Next, the fourth example will be described, where a specific value applies. Figure 15 and Figure 16 The camera module 11 shown.

[0169] [Optical system on the short focal length side]

[0170] Figure 15 The optical system on the short focal length side of the imaging lens assembly 21 according to the fourth example is shown. In the fourth example, the rear lens group 32 also includes a fifth lens L5 in addition to the third lens L3 and the fourth lens L4. Lens parameters similar to those in the first example are shown in Tables 28-31.

[0171]

[0172] Table 31

[0173]

[0174]

[0175] [Optical system on the telephoto side]

[0176] Figure 16 The optical system on the long focal length side of the imaging lens assembly 21 according to the fourth example is shown. Lens parameters similar to those in the first example are shown in Tables 32-35.

[0177]

[0178] Table 35

[0179]

[0180]

[0181] Table 36 shows the values ​​corresponding to the conditional expressions.

[0182] Table 36

[0183] 3<(ΣWd+ΣTd) / (Yh_w+Yh_t)<20 14.72 ΣWd / fw<2.0 1.39 ΣTd / ft<2.0 1.43 WLG1 / fw < 2.0 1.50 WLG1 / LG2<0 -0.06 TLG1 / LG2<0 -0.08 ΣTLd1 / ΣWLd1<2.0 0.82

[0184] Figure 17 The image shows the aberrations on the short focal length side in the fourth example. Figure 18 The image shows the aberrations on the long focal length side in the fourth example.

[0185] According to the fourth example, by making the lens parameters and number of lenses in the fourth example different from those in the first to third examples, the design freedom of the camera module 11 according to this application can be increased, while achieving the same effect as the first example.

[0186] [Fifth Example]

[0187] Next, the fifth example will be described, where a specific value applies. Figure 19 and Figure 20 The camera module 11 shown.

[0188] [Optical system on the short focal length side]

[0189] Figure 19 An optical system on the short focal length side of an imaging lens assembly 21 according to a fifth example is shown.

[0190] Lens parameters similar to those in the first example are shown in Tables 37-40.

[0191]

[0192] Table 40

[0193]

[0194]

[0195] [Optical system on the telephoto side]

[0196] Figure 20 An optical system on the long focal length side of an imaging lens assembly 21 according to a fifth example is shown.

[0197] Lens parameters similar to those in the first example are shown in Tables 41-44.

[0198]

[0199] Table 44

[0200]

[0201]

[0202] Table 45 shows the values ​​corresponding to the conditional expressions.

[0203] Table 45

[0204] 3<(ΣWd+ΣTd) / (Yh_w+Yh_t)<20 12.92 ΣWd / fw<2.0 1.40 ΣTd / ft<2.0 1.41 WLG1 / fw < 2.0 1.42 WLG1 / LG2<0 -0.44 TLG1 / LG2<0 -0.60 ΣTLd1 / ΣWLd1<2.0 1.49

[0205] Figure 21 The image shows the aberrations on the short focal length side in the fifth example. Figure 22 The image shows the aberrations on the long focal length side in the fifth example.

[0206] According to the fifth example, by making the lens parameters and / or number of lenses in the fifth example different from the lens parameters and / or number of lenses in the first to fourth examples, the design freedom of the camera module 11 according to this application can be increased, while achieving the same effect as the first example.

[0207] In the description of the embodiments of this application, it should be understood that terms such as “center,” “longitudinal,” “lateral,” “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 orientation or position described or shown in the accompanying drawings. These relative terms are used only to simplify the description of this application and do not indicate or imply that the mentioned devices or elements must have a specific orientation, or must be constructed or operated in a specific orientation. Therefore, these terms should not be used to limit this application.

[0208] Furthermore, terms such as “first” and “second” are used herein for descriptive purposes and are not intended to indicate or imply relative importance or significance, nor are they intended 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 application, unless otherwise stated, “multiple” means “two or more”.

[0209] In the description of the embodiments of this application, unless otherwise specified or limited, the terms "installation", "connection", "coupling", etc. are used extensively. For example, it can be a fixed connection, a detachable connection or an integral molding; it can also be a mechanical or electrical connection; it can also be a direct connection or an indirect connection via an intermediate structure; it can also be the internal communication between two elements that can be understood by those skilled in the art according to the specific circumstances.

[0210] In embodiments of this application, unless otherwise specified or limited, a structure 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 and second features are not in direct contact but are in contact via additional features formed therebetween. Furthermore, "above," "on top of," or "on the apex" of the second feature may include embodiments where the first feature is orthogonally or obliquely located above, above, or on the apex of the second feature, or simply means that the first feature is at a higher height than the second feature; while a first feature located "below," "below," or "at the bottom" of the second feature may include embodiments where the first feature is orthogonally or obliquely located below, below, or at the bottom of the second feature, or simply means that the first feature is at a lower height than the second feature.

[0211] Various embodiments and examples have been provided in the foregoing description to implement different structures of this application. To simplify this application, certain elements and arrangements have been described above. However, these elements and arrangements are merely examples and are not intended to limit this application. Furthermore, reference numerals and / or reference letters may be repeated in different examples of this application. This repetition is for simplification and clarity, and does not indicate a relationship between different embodiments and / or arrangements. In addition, examples of different processes and materials are provided in this application. However, those skilled in the art will understand that other processes and / or materials may also be applied.

[0212] In this specification, references to "embodiment," "some embodiments," "exemplary embodiments," "example," "specific example," or "some examples" mean that a particular feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of this application. Therefore, the appearance of these phrases throughout this specification does not necessarily refer to the same embodiment or example of this application. Furthermore, in one or more embodiments or examples, specific features, structures, materials, or characteristics may be combined in any suitable manner.

[0213] Although embodiments of this application have been shown and described, those skilled in the art should understand that the embodiments are illustrative and should not be construed as limiting the application, and changes, modifications, substitutions and variations may be made in the embodiments without departing from the scope of the application.

Claims

1. An imaging lens assembly, characterized in that, include: The first lens group is used for shooting at a short focal length; The second lens group is used for shooting at a long focal length; The third lens group is used for shooting at the short focal length and the long focal length; A first reflecting mirror is located between the first lens group and the third lens group; as well as The second reflecting mirror is located between the second lens group and the third lens group; in At least one of the first lens group and the second lens group is configured to change its position in the optical axis direction between a shooting state and a lens storage state; The first or second reflector is configured to, in the shooting state, form an optical path that optically connects the corresponding lens group and the third lens group by tilting relative to the optical axis direction of the corresponding lens group in the first and second lens groups and the optical axis direction of the third lens group; The first and second reflectors are configured such that, in the lens storage state, the first and second reflectors are substantially perpendicular to the optical axis of the corresponding lens group to ensure storage space for the corresponding lens group; and The imaging lens assembly is configured to satisfy at least one of the following: 3<(∑Wd+∑Td) / (Yh_w+Yh_t)<20, ∑Wd / fw < 2.0; ∑Td / ft<2.0; WLG1 / fw < 2.0; WLG1 / LG2 < 0; TLG1 / LG2 < 0; and ∑TLd1 / ∑WLd1<2.0; Wherein, ∑Wd is the distance from the vertex of the object-side surface of the lens closest to the object side of the first lens group to the imaging surface on the first optical axis of the imaging lens assembly, the first optical axis including the optical axes of the first lens group and the third lens group that are continuous with each other at the intersection with the first mirror; ∑Td is the distance from the vertex of the object-side surface of the lens closest to the object side of the second lens group to the imaging surface on the second optical axis of the imaging lens assembly, the second optical axis including the optical axes of the second lens group and the third lens group that are continuous with each other at the intersection with the second mirror; and Yh_w is the imaging height on the short focal length side. Yh_t is the imaging height on the long focal length side, fw is the focal length of the imaging lens assembly on the short focal length side, ft is the focal length of the imaging lens assembly on the long focal length side, WLG1 is the focal length of the first lens group, LG2 is the focal length of the third lens group, TLG1 is the focal length of the second lens group, ∑TLd1 is the distance on the optical axis of the second lens group from the vertex of the object-side surface of the lens closest to the object side of the second lens group to the second reflecting mirror, and ∑WLd1 is the distance on the optical axis of the first lens group from the vertex of the object-side surface of the lens closest to the object side of the first lens group to the first reflecting mirror.

2. The imaging lens assembly according to claim 1, characterized in that, The first reflector is configured such that, when the shooting state is a short focal length shooting state, it forms an optical path optically connecting the first lens group and the three lens groups by tilting relative to both the optical axis direction of the first lens group and the optical axis direction of the third lens group; and The first reflector is configured such that, when the shooting state is a long focal length shooting state, by keeping the first reflector substantially perpendicular to the optical axis direction of the first lens group, the optical path connecting the second lens group and the third lens group is not interfered with.

3. The imaging lens assembly according to claim 1, characterized in that, Each of the first lens group and the second lens group includes at least one lens with positive refractive power; and The third lens group includes at least one lens with negative refractive power.

4. The imaging lens assembly according to claim 1, characterized in that, The imaging lens assembly is further configured such that: (WLG1+TLG1) / (WLG1-TLG1)>-15, Wherein, WLG1 is the focal length of the first lens group and TLG1 is the focal length of the second lens group.

5. The imaging lens assembly according to claim 1, characterized in that, In the lens storage state, the first lens group and the second lens group are positioned parallel to the optical axis of the third lens group.

6. The imaging lens assembly according to claim 1, characterized in that, The optical axis directions of the first lens group and the second lens group are substantially perpendicular to the optical axis direction of the third lens group.

7. The imaging lens assembly according to claim 1, characterized in that, The first reflecting mirror is rotatable about one end of the third lens group side of the first reflecting mirror, and The second reflector is rotatable about one end of the third lens group side of the second reflector.

8. The imaging lens assembly according to claim 1, characterized in that, Compared to the first lens group, the second lens group is positioned further away from the imaging surface.

9. The imaging lens assembly according to claim 1, characterized in that, The shooting with a short focal length is a wide-angle shot, and The shooting with a telephoto lens refers to shooting from a distance.

10. A camera module, comprising: Imaging lens assembly according to any one of claims 1-9; and Image sensor, including imaging surface.

11. The camera module according to claim 10, characterized in that, It also includes an infrared filter disposed between the imaging lens assembly and the image sensor.

12. An imaging device, comprising: The camera module according to claim 10 or 11; as well as A housing for accommodating the imaging lens assembly.

Images