Periscope lens, imaging module and electronic device

Abstract

The present invention discloses a periscope lens, an imaging module and an electronic device. The periscope lens includes a plurality of optical elements arranged along the first optical axis and the second optical axis of the periscope lens, and includes, from the object side to the image side, a first lens with positive refractive power, an optical path folding element, a second lens with positive refractive power, a third lens with negative refractive power, a fourth lens with negative refractive power, and a fifth lens with negative refractive power. The optical path folding element is configured to direct light from the first optical axis to the second optical axis. The first lens to the fifth lens include at least one plane. The first lens is glued to the optical path folding element. The periscope lens satisfies the following conditional formula: f1>0 and f25>0. The periscope lens of the embodiment of the present invention satisfies the above conditional formula, and the reasonable distribution of optical focal length realizes the effect of telephoto and miniaturization of lateral aperture, thereby better adapting to the requirements of thin and light electronic devices.

Description

Technical Field

[0001] The present invention relates to the field of imaging technology, and in particular to a periscope lens, an imaging module and an electronic device. Background Art

[0002] With the development of technology, electronic devices tend to be thinner and smaller, and the internal components of electronic devices are required to be smaller. The size of the optical system for camera must be miniaturized under the market trend. In related technologies, the folding periscope lens can achieve a good telephoto effect and a large zoom ratio, but some lens apertures of the lens cannot be miniaturized, which affects the thinness and lightness of electronic devices. Summary of the invention

[0003] Embodiments of the present invention provide a periscope lens, an imaging module, and an electronic device.

[0004] An embodiment of the present invention provides a periscope lens, comprising a plurality of optical elements arranged along a first optical axis and a second optical axis of the periscope lens, and including, from the object side to the image side:

[0005] a first lens having positive refractive power, located on the first optical axis, wherein the object side surface of the first lens is a convex surface and the image side surface is a flat surface;

[0006] an optical path folding element configured to direct light from the first optical axis to the second optical axis;

[0007] a second lens having positive refractive power, located on the second optical axis, wherein the object side surface of the second lens is a convex surface;

[0008] a third lens having negative refractive power, located on the second optical axis;

[0009] a fourth lens having negative refractive power, located on the second optical axis, wherein the image side surface of the fourth lens is a concave surface;

[0010] a fifth lens element having negative refractive power, located on the second optical axis;

[0011] The first lens to the fifth lens include at least one plane, the first lens is glued to the optical path folding element, and the periscope lens satisfies the following conditional formula:

[0012] f1>0; and

[0013] f25>0;

[0014] Wherein, f1 is the effective focal length of the first lens, and f25 is the combined focal length of the second lens to the fifth lens.

[0015] The periscope lens according to the embodiment of the present invention meets the above conditions, with a reasonable distribution of optical power, achieving the effects of telephoto and miniaturization of the lateral aperture, thus better meeting the requirements of the thinning of electronic devices.

[0016] In some embodiments, the periscope lens meets the following conditions: 1.75 < TTL / (ImgH*2) < 2.2; 25 < HFOV < 28; and 0.55 < DL / TTL < 0.7; where TTL is the distance from the object side of the second lens to the image sensor on the second optical axis, ImgH is half of the diagonal length of the effective pixel region of the periscope lens, HFOV is the 1 / 2 field of view angle in the diagonal direction of the image sensor, and DL is the distance from the object side of the second lens to the image side of the fifth lens on the second optical axis. In this way, the compact and reasonable structural layout and the reasonable distribution of optical power enable the periscope lens to image well within a visible field of view.

[0017] In some embodiments, the periscope lens meets the following conditions: 0.9 < TTL / f < 1; where f is the effective focal length of the periscope lens and TTL is the distance from the object side of the second lens to the image sensor on the second optical axis. In this way, the compact and reasonable structural layout and the reasonable distribution of optical power achieve the telephoto function of the periscope lens and ensure the imaging quality.

[0018] In some embodiments, the periscope lens meets the following conditions: T34 / T45 < 0.5; where T34 is the air gap between the third lens and the fourth lens on the optical axis, and T45 is the air gap between the fourth lens and the fifth lens on the optical axis. In this way, the reasonable layout of the size structure realizes the compression of the length dimension of the periscope lens, can slow down the direction change of light after entering the system, and helps to reduce the intensity of stray light.

[0019] In some embodiments, the periscope lens meets the following conditions: |f3 / f4| > 1; where f3 is the effective focal length of the third lens and f4 is the effective focal length of the fourth lens. In this way, it is beneficial to the optical power balance, realizes the telephoto function, and at the same time slows down the sensitivity of the periscope lens.

[0020] In some embodiments, the periscope lens meets the following conditions: |f2 / f1| > 0.05; where f2 is the effective focal length of the second lens. In this way, it is beneficial to the optical power balance, compresses the aperture sizes of multiple lateral lenses, and at the same time slows down the sensitivity of the periscope lens.

[0021] In some embodiments, the periscope lens satisfies the following condition: |V3-V2|>30; wherein V3 is the Abbe number of the third lens, and V2 is the Abbe number of the second lens. This is beneficial to correct chromatic aberration and ensure the performance of the periscope lens.

[0022] In some embodiments, at least one surface of at least one lens in the periscope lens is aspherical. In this way, the aspherical surface is conducive to correcting the aberration of the periscope lens and reducing the number of lenses used, which can effectively reduce the total length of the periscope lens.

[0023] In some embodiments, the periscope lens includes an aperture stop, and the aperture stop is located on the object side of the second lens or between the second lens and the fifth lens. This is conducive to reducing the lateral aperture of the periscope lens.

[0024] In some embodiments, at least one lens of the periscope lens is made of a first plastic material, and at least another lens is made of a second plastic material, and the optical properties of the first plastic material are different from the optical properties of the second plastic material. In this way, multiple lenses are made of plastic materials with different optical properties, which is conducive to ensuring the performance of the periscope lens.

[0025] An imaging module according to an embodiment of the present invention comprises:

[0026] Image sensor; and

[0027] In the periscope lens described in any of the above embodiments, the image sensor is arranged on the image side of the fifth lens.

[0028] In the imaging module of the embodiment of the present invention, the periscope lens satisfies the above-mentioned conditional formula, and the reasonable distribution of optical power achieves the effects of telephoto and miniaturization of lateral aperture, thereby better meeting the requirements of lightweight electronic devices.

[0029] In some embodiments, at least one of the plurality of optical elements is configured to translate or move along a corresponding optical axis to adjust the focus of the image at the imaging plane of the image sensor, so that the object scene can be dynamically focused from infinity to a close distance.

[0030] In some embodiments, the image sensor is configured to translate or move along a corresponding optical axis to adjust the focus of the image at the imaging plane of the image sensor. In this way, the object scene can be dynamically focused from infinity to a close distance.

[0031] An electronic device according to an embodiment of the present invention comprises a housing and an imaging module according to any one of the above embodiments, wherein the imaging module is mounted on the housing.

[0032] In the electronic device of the embodiment of the present invention, the periscope lens in the imaging module satisfies the above-mentioned conditional formula, and the reasonable distribution of optical power achieves the effects of telephoto and miniaturization of the lateral aperture, which is conducive to the lightweight and thinning of the electronic device.

[0033] Additional aspects and advantages of the present invention will be given in part in the following description and in part will be obvious from the following description, or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0035] Figure 1 is a schematic structural diagram of a periscope lens according to an embodiment of the present invention;

[0036] Figure 2 is a spherical aberration curve diagram of the periscope lens in the visible band from 470nm to 650nm according to the first embodiment of the present invention;

[0037] Figure 3 is an astigmatism curve diagram of the periscope lens in the visible band from 470nm to 650nm according to the first embodiment of the present invention;

[0038] Figure 4 is a distortion curve diagram of the periscope lens in the visible band from 470nm to 650nm according to the first embodiment of the present invention;

[0039] Figure 5 is a spherical aberration curve diagram of the periscope lens in the visible band from 470nm to 650nm according to the second embodiment of the present invention;

[0040] Figure 6 is an astigmatism curve diagram of the periscope lens in the visible band from 470nm to 650nm according to the second embodiment of the present invention;

[0041] Figure 7 is a distortion curve diagram of the periscope lens of the second embodiment of the present invention in the visible band from 470nm to 650nm;

[0042] Figure 8 is a spherical aberration curve diagram of the periscope lens in the visible band from 470nm to 650nm according to the third embodiment of the present invention;

[0043] Fig. 9 is an astigmatism curve of the periscope lens in the visible band from 470 nm to 650 nm according to the third embodiment of the present invention;

[0044] Fig.10 is a distortion curve diagram of the periscope lens in the visible band from 470nm to 650nm according to the third embodiment of the present invention;

[0045] Fig.11 is a spherical aberration curve diagram of the periscope lens in the visible band from 470nm to 650nm according to the fourth embodiment of the present invention;

[0046] Fig.12 is an astigmatism curve diagram of the periscope lens in the visible band from 470nm to 650nm according to the fourth embodiment of the present invention;

[0047] Fig.13 is a distortion curve diagram of the periscope lens of Embodiment 4 of the present invention in the visible band from 470nm to 650nm;

[0048] Fig.14 is a schematic structural diagram of an imaging module according to an embodiment of the present invention;

[0049] Fig.15 It is a schematic plan view of an electronic device according to an embodiment of the present invention. DETAILED DESCRIPTION

[0050] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0051] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0052] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. It can be a mechanical connection or an electrical connection. It can be directly connected or indirectly connected through an intermediate medium. It can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0053] See also Figure 1 The periscope lens 10 of the embodiment of the present invention includes a plurality of optical elements arranged along the first optical axis AX1 and the second optical axis AX2 of the periscope lens 10, and includes the following in order from the object side to the image side:

[0054] A first lens L1 having positive refractive power is located on the first optical axis AX1, an object-side surface S1 of the first lens L1 is a convex surface and an image-side surface S2 is a flat surface;

[0055] an optical path folding element L0 configured to direct light from the first optical axis AX1 to the second optical axis AX2;

[0056] a second lens L2 having positive refractive power, located on the second optical axis AX2, and an object-side surface S9 of the second lens L2 being a convex surface;

[0057] a third lens L3 having negative refractive power, located on the second optical axis AX2;

[0058] a fourth lens L4 having negative refractive power, located on the second optical axis AX2, and an image-side surface S15 of the fourth lens L4 being a concave surface;

[0059] a fifth lens L5 having negative refractive power, located on the second optical axis AX2;

[0060] The first lens L1 to the fifth lens L5 include at least one plane, the first lens L1 is cemented on the optical path folding element L0, and the periscope lens 10 satisfies the following conditions: f1>0; and f25>0; wherein f1 is the effective focal length of the first lens L1, and f25 is the combined focal length of the second lens L2 to the fifth lens L5.

[0061] The periscope lens 10 of the embodiment of the present invention satisfies the above-mentioned conditional formula, and the reasonable distribution of optical power achieves the effects of telephoto and miniaturization of lateral aperture, thereby better meeting the requirements of lightweight electronic device 100.

[0062] It can be understood that the periscope lens 10 satisfies the conditions: f1>0 and f25>0, and the reasonable distribution of the optical power is conducive to realizing the telephoto function and the miniaturization of the lateral aperture of the periscope lens 10. Specifically, it is conducive to miniaturization of the apertures of the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5. In this way, by reducing the lateral aperture of the periscope lens 10, the miniaturization of the periscope lens 10 is achieved, so that the periscope lens 10 can better meet the requirements of the electronic device 100 to be thin and light.

[0063] Furthermore, gluing the first lens L1 with positive refractive power on the optical path folding element L0 can effectively reduce the lateral aperture of the periscope lens 10, that is, the apertures of the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 can be reduced. In the example of the present invention, the image side surface of the first lens L1 is a plane.

[0064] In the present embodiment, the first optical axis AX1 is substantially perpendicular to the second optical axis AX2. It can be understood that in other embodiments, the included angle formed by the first optical axis and the second optical axis can also be other angles except 90 degrees.

[0065] In some embodiments, the periscope lens 10 satisfies the following conditional expressions: 1.75 < TTL / (ImgH*2) < 2.2; 25 < HFOV < 28; and 0.55 < DL / TTL < 0.7; where TTL is the distance from the object side surface of the second lens L2 to the image sensor 20 on the second optical axis AX2, ImgH is half of the diagonal length of the effective pixel region of the periscope lens, HFOV is the 1 / 2 field of view angle in the diagonal direction of the image sensor 20, and DL is the distance from the object side surface of the second lens L2 to the image side surface of the fifth lens L5 on the second optical axis AX2.

[0066] Thus, the compact and reasonable structural layout and the reasonable distribution of the optical power enable the periscope lens 10 to form a good image within a visible field of view. Specifically, in some examples, the value of TTL / (ImgH*2) can be 1.76, 1.80, 1.93, 2.0, 2.1, or other values between 1.75 and 2.2. HFOV can take values of 26, 27, or other values between 25 and 28. DL / TTL can take values of 0.56, 0.19, 0.6, 0.65, or other values between 0.55 and 0.7.

[0067] In some embodiments, the periscope lens 10 satisfies the following conditional expression: 0.9 < TTL / f < 1; where f is the effective focal length of the periscope lens 10, and TTL is the distance from the object side surface of the second lens L2 to the image sensor 20 on the second optical axis AX2.

[0068] Thus, the compact and reasonable structural layout and the reasonable distribution of the optical power achieve the telephoto function of the periscope lens 10 and ensure the imaging quality. Specifically, in some examples, the value of TTL / f can be 0.91, 0.94, 0.96, 0.99, or other values between 0.9 and 1.

[0069] In some embodiments, the periscope lens 10 satisfies the following conditional expression: T34 / T45 < 0.5; where T34 is the air gap between the third lens L3 and the fourth lens L4 on the second optical axis AX2, and T45 is the air gap between the fourth lens L4 and the fifth lens L5 on the second optical axis AX2.

[0070] In this way, the reasonable layout of the size structure can achieve the compression of the length of the periscope lens 10, which can slow down the change in direction of light after entering the system and help reduce the intensity of stray light. Specifically, in some examples, T34 / T45 can be 0.45, 0.4, 0.3 or other values ​​greater than or equal to 0.3 and less than 0.5.

[0071] In some embodiments, the periscope lens 10 satisfies the following condition: |f3 / f4|>1; wherein f3 is the effective focal length of the third lens L3, and f4 is the effective focal length of the fourth lens L4.

[0072] This is beneficial to the balance of optical power, achieving the telephoto function, and at the same time reducing the sensitivity of the periscope lens 10. Specifically, in some examples, |f3 / f4| can be 1.2, 2, 4 or other values ​​greater than 1.

[0073] In some embodiments, the periscope lens 10 satisfies the following condition: |f2 / f1|>0.05; where f2 is the effective focal length of the second lens L2.

[0074] This is beneficial to the balance of optical power, compressing the aperture size of multiple lateral lenses, and slowing down the sensitivity of the periscope lens 10. Specifically, in some examples, |f2 / f1| can be 0.06, 0.1, 0.5 or other values ​​greater than 0.05.

[0075] In some embodiments, the periscope lens 10 satisfies the following condition: |V3-V2|>30; wherein V3 is the Abbe number of the third lens L3, and V2 is the Abbe number of the second lens L2.

[0076] This is beneficial to correct chromatic aberration and ensure the performance of the periscope lens 10. Specifically, in some examples, |V3-V2| can be 31, 35, 40 or other values ​​greater than 30.

[0077] In some embodiments, at least one surface of at least one lens in the periscope lens 10 is aspherical.

[0078] In this way, the aspheric surface is conducive to correcting the aberration of the periscope lens 10 and reducing the number of lenses used, which can effectively reduce the total length of the periscope lens 10. It can be understood that the aspheric surface is easy to be made into a shape other than a spherical surface, and more control variables can be obtained, which is not only conducive to reducing aberrations, but also conducive to reducing the number of lenses.

[0079] In some embodiments, the periscope lens 10 includes an aperture stop AS. The aperture stop AS is located on the object side of the second lens L2 or between the second lens L2 to the fifth lens L5.

[0080] In this way, it is beneficial to reduce the lateral diameter of the periscope lens 10, that is, it is beneficial to reduce the diameter of the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5. It can be understood that according to EPD=EFL / Fno (EPD is the entrance pupil diameter, EFL is the effective focal length, and Fno is the F number), under the condition that EFL and FNO are constant, EPD is also constant. The imaging of the periscope lens 10 includes the first lens L1, the prism, and the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5. The aperture diaphragm AS is placed in the center, and the entrance pupil is the image formed by the diaphragm through the system part before it, so that the diameter of the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 can be miniaturized.

[0081] In some embodiments, the light path folding element L0 is a prism. Thus, the prism is used to fold the light path. Specifically, the prism is a triangular prism.

[0082] In some embodiments, at least one lens in the periscope lens 10 is made of a first plastic material, and at least another lens is made of a second plastic material, and the optical properties of the first plastic material are different from the optical properties of the second plastic material.

[0083] In this way, multiple lenses are made of plastic materials with different optical properties, which is conducive to ensuring the performance of the periscope lens 10. The optical properties are, for example, Abbe number and / or refractive index. Specifically, the first lens L1, the second lens L2, the fourth lens L4 and the fifth lens L5 are made of a first plastic material, and the third lens L3 is made of a second plastic material. In one example, the refractive index of the first plastic material is 1.544, and the refractive index of the second plastic material is 1.65.

[0084] In the periscope lens 10 of the present invention, a convex lens surface means that the portion of the lens surface close to the optical axis of the periscope lens 10 is a convex surface, and a concave lens surface means that the portion of the lens surface close to the optical axis of the periscope lens 10 is a concave surface.

[0085] The shape of an aspheric surface is determined by the following formula:

[0086]

[0087] Where h is the height from any point on the aspheric surface to the optical axis, c is the vertex curvature, k is the cone constant, and Ai is the correction coefficient of the i-th order aspheric surface.

[0088] The present invention will be described in detail through the following specific embodiments with reference to the accompanying drawings.

[0089] Embodiment 1:

[0090] See also Figures 1 to 4, the periscope lens 10 of this embodiment satisfies the conditions of the following Tables 1 to 3, where ASP represents an aspherical surface.

[0091] Table 1

[0092]

[0093]

[0094] Among them, f is the effective focal length of the periscope lens 10, Fno is the F number, that is, the inverse of the relative aperture, FOV is the field of view angle, TTL is the distance from the object side of the second lens L2 to the image sensor 20 on the second optical axis AX2, DL is the distance from the object side of the second lens L2 to the image side of the fifth lens L5 on the second optical axis AX2, ImgH is half the diagonal length of the effective pixel area of ​​the periscope lens 10, MIC is the maximum image height (full image height), CRA is the angle between the main light of the corresponding field of view and the normal of the imaging surface, SL is the distance from the aperture stop AS to the image sensor 20 on the second optical axis AX2, and EPD is the entrance pupil diameter.

[0095] In Table 1, surfaces S3 to S7 represent the five faces of the optical path folding element L0 (prism), and surfaces S6 and S7 represent the two triangular side faces of the prism, one facing outward and the other facing inward. Figure 1 Surface S11 is a virtual plane between the second lens L2 and the third lens L3. Figure 1 Not shown in the figure, of course, surface S11 may also be omitted.

[0096] Table 2

[0097]

[0098] Table 3

[0099]

[0100]

[0101] In Table 3, the lens surface with respect to the optical axis indicates that the portion of the lens surface on the optical axis is concave, convex, or flat; the lens surface with respect to the circumference indicates that the portion of the lens surface on the circumferential edge is concave, convex, or flat.

[0102] Embodiment 2:

[0103] See also Figure 1 and Figures 5 to 7 , the periscope lens 10 of this embodiment satisfies the conditions of the following Tables 4 to 6, where ASP represents an aspherical surface.

[0104] Table 4

[0105]

[0106] Among them, f is the effective focal length of the periscope lens 10, Fno is the F number, that is, the inverse of the relative aperture, FOV is the field of view angle, TTL is the distance from the object side of the second lens L2 to the image sensor 20 on the second optical axis AX2, DL is the distance from the object side of the second lens L2 to the image side of the fifth lens L5 on the second optical axis AX2, ImgH is half the diagonal length of the effective pixel area of ​​the periscope lens 10, MIC is the maximum image height (full image height), CRA is the angle between the main light of the corresponding field of view and the normal of the imaging surface, SL is the distance from the aperture stop AS to the image sensor 20 on the second optical axis AX2, and EPD is the entrance pupil diameter.

[0107] In Table 4, surfaces S3 to S7 represent the five faces of the optical path folding element L0 (prism), and surfaces S6 and S7 represent the two triangular side faces of the prism, one facing outward and the other facing inward. Figure 1 Surface S11 is a virtual plane between the second lens L2 and the third lens L3. Figure 1 Not shown in the figure, of course, surface S11 may also be omitted.

[0108] Table 5

[0109]

[0110] Table 6

[0111]

[0112] In Table 6, the lens surface with respect to the optical axis indicates that the portion of the lens surface on the optical axis is concave, convex, or flat; the lens surface with respect to the circumference indicates that the portion of the lens surface on the circumferential edge is concave, convex, or flat.

[0113] Embodiment three:

[0114] See also Figure 1 and Figures 8 to 10 , the periscope lens 10 of this embodiment satisfies the conditions of the following Tables 7 to 9, where ASP represents aspherical surface.

[0115] Table 7

[0116]

[0117] Among them, f is the effective focal length of the periscope lens 10, Fno is the F number, that is, the inverse of the relative aperture, FOV is the field of view angle, TTL is the distance from the object side of the second lens L2 to the image sensor 20 on the second optical axis AX2, DL is the distance from the object side of the second lens L2 to the image side of the fifth lens L5 on the second optical axis AX2, ImgH is half the diagonal length of the effective pixel area of ​​the periscope lens 10, MIC is the maximum image height (full image height), CRA is the angle between the main light of the corresponding field of view and the normal of the imaging surface, SL is the distance from the aperture stop AS to the image sensor 20 on the second optical axis AX2, and EPD is the entrance pupil diameter.

[0118] In Table 7, surfaces S3 to S7 represent the five faces of the optical path folding element L0 (prism), and surfaces S6 and S7 represent the two triangular side faces of the prism, one facing outward and the other facing inward. Figure 1 Surface S11 is a virtual plane between the second lens L2 and the third lens L3. Figure 1 Not shown in the figure, of course, surface S11 may also be omitted.

[0119] Table 8

[0120]

[0121] Table 9

[0122]

[0123] In Table 9, the lens surface with respect to the optical axis indicates that the portion of the lens surface on the optical axis is concave, convex, or flat; the lens surface with respect to the circumference indicates that the portion of the lens surface on the circumferential edge is concave, convex, or flat.

[0124] Embodiment 4:

[0125] See also Figure 1 and Figures 11 to 13 , the periscope lens 10 of this embodiment satisfies the conditions of the following Tables 10 to 12, where ASP represents aspherical surface.

[0126] Table 10

[0127]

[0128] Among them, f is the effective focal length of the periscope lens 10, Fno is the F number, that is, the inverse of the relative aperture, FOV is the field of view angle, TTL is the distance from the object side of the second lens L2 to the image sensor 20 on the second optical axis AX2, DL is the distance from the object side of the second lens L2 to the image side of the fifth lens L5 on the second optical axis AX2, ImgH is half the diagonal length of the effective pixel area of ​​the periscope lens 10, MIC is the maximum image height (full image height), CRA is the angle between the main light of the corresponding field of view and the normal of the imaging surface, SL is the distance from the aperture stop AS to the image sensor 20 on the second optical axis AX2, and EPD is the entrance pupil diameter.

[0129] In Table 10, surfaces S3 to S7 represent the five faces of the optical path folding element L0 (prism), and surfaces S6 and S7 represent the two triangular side faces of the prism, one facing outward and the other facing inward. Figure 1 Surface S11 is a virtual plane between the second lens L2 and the third lens L3. Figure 1 Not shown in the figure, of course, surface S11 may also be omitted.

[0130] Table 11

[0131]

[0132] Table 12

[0133]

[0134] In Table 12, the lens surface with respect to the optical axis indicates that the portion of the lens surface on the optical axis is concave, convex, or flat; the lens surface with respect to the circumference indicates that the portion of the lens surface on the circumferential edge is concave, convex, or flat.

[0135] See also Fig.14 The imaging module 100 of the embodiment of the present invention includes an image sensor 20 and a periscope lens 10 of any of the above embodiments. The image sensor 20 is arranged on the image side of the fifth lens L5.

[0136] The imaging module 100 of the embodiment of the present invention and the periscope lens 10 satisfy the above-mentioned conditional formula, and the reasonable distribution of optical power achieves the effects of telephoto and miniaturization of lateral aperture, thereby better meeting the requirements of thinness and lightness of the electronic device 100.

[0137] It can be understood that the image sensor 20 can be a complementary metal oxide semiconductor (CMOS) image sensor or a charge-coupled device (CCD) image sensor.

[0138] In some embodiments, at least one of the plurality of optical elements is configured to translate or move along a corresponding optical axis to adjust the focus of the image at the imaging plane of the image sensor 20 .

[0139] In this way, the object scene can be dynamically focused from infinity (object distance greater than or equal to 20 meters) to a close distance (less than 1 meter).

[0140] In some embodiments, the image sensor 20 is configured to translate or move along a corresponding optical axis to adjust the focus of the image at the imaging plane of the image sensor 20 .

[0141] In this way, the object scene can be dynamically focused from infinity (object distance greater than or equal to 20 meters) to a close distance (less than 1 meter).

[0142] See also Fig.15 The electronic device 1000 according to the embodiment of the present invention includes a housing 200 and an imaging module 100 according to any one of the above embodiments, and the imaging module 100 is installed in the housing 200 .

[0143] In the electronic device 1000 of the embodiment of the present invention, the periscope lens 10 in the imaging module 100 satisfies the above conditional formula, and the reasonable distribution of optical focal length achieves the effects of telephoto and miniaturization of the lateral aperture, which is conducive to the lightweight and thinning of the electronic device 1000.

[0144] It is understood that the electronic device 1000 of the embodiment of the present invention includes but is not limited to information terminal devices such as smart phones, personal digital assistants (PDAs), tablet computers, personal computers (PCs), smart wearable devices, or home appliances with camera functions. Fig.15 In the example of FIG. 1 , the electronic device 1000 is a smart phone. The imaging module 100 may be disposed on the back of the electronic device 1000 .

[0145] The disclosure above provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described above. Of course, they are merely examples, and the purpose is not to limit the present invention. In addition, the present invention may repeat reference numerals and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides various specific examples of processes and materials, but those of ordinary skill in the art may appreciate the application of other processes and / or the use of other materials.

[0146] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiments or examples are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0147] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. A periscope lens, characterized in that: There are a total of five lenses with refractive power, including a plurality of optical elements arranged along the first optical axis and the second optical axis of the periscope lens, which successively include, from the object side to the image side: A first lens with positive refractive power, located on the first optical axis, the object side surface of the first lens being convex and the image side surface being flat; An optical path folding element configured to direct light from the first optical axis to the second optical axis; A second lens with positive refractive power, located on the second optical axis, the object side surface of the second lens being convex; A third lens with negative refractive power, located on the second optical axis; A fourth lens with negative refractive power, located on the second optical axis, the image side surface of the fourth lens being concave; A fifth lens with negative refractive power, located on the second optical axis; At least one of the first lens to the fifth lens includes a flat surface, the first lens is glued to the optical path folding element, and the periscope lens satisfies the following conditional expressions: f1>0; and f25>0； where f1 is the effective focal length of the first lens, and f25 is the combined focal length of the second lens to the fifth lens; At least one surface of at least one lens in the periscope lens is an aspherical surface; At least one lens in the periscope lens is made of a first plastic material, and at least another lens is made of a second plastic material, and the optical properties of the first plastic material are different from those of the second plastic material.

2. The periscope lens according to claim 1, characterized in that: The periscope lens satisfies the following conditional expressions: 1.75<TTL / (ImgH*2)<2.2; 25<HFOV<28; and 0.55<DL / TTL<0.7; where TTL is the distance from the object side surface of the second lens to the image sensor on the second optical axis, ImgH is half of the diagonal length of the effective pixel area of the periscope lens, HFOV is the 1 / 2 field of view angle in the diagonal direction of the image sensor, and DL is the distance from the object side surface of the second lens to the image side surface of the fifth lens on the second optical axis.

3. The periscope lens according to claim 1, characterized in that: The periscope lens satisfies the following conditional expressions: 0.9<TTL / f<1; where f is the effective focal length of the periscope lens, and TTL is the distance from the object side surface of the second lens to the image sensor on the second optical axis.

4. The periscope lens according to claim 1, characterized in that: The periscope lens satisfies the following conditional expressions: 0.3≤T34 / T45<0.5; where T34 is the air gap between the third lens and the fourth lens on the second optical axis, and T45 is the air gap between the fourth lens and the fifth lens on the second optical axis.

5. The periscope lens according to claim 1, characterized in that: The periscope lens satisfies the following conditional expressions: |f3 / f4|>1; where f3 is the effective focal length of the third lens, and f4 is the effective focal length of the fourth lens.

6. The periscope lens according to claim 1, characterized in that: The periscope lens satisfies the following conditional expressions: |f2 / f1|>0.05; where f2 is the effective focal length of the second lens.

7. The periscope lens according to claim 1, characterized in that: The periscope lens satisfies the following conditional expressions: |V3-V2|>30; where V3 is the Abbe number of the third lens, and V2 is the Abbe number of the second lens.

8. The periscope lens according to claim 1, characterized in that: The periscope lens includes an aperture stop, and the aperture stop is located on the object side of the second lens or between the second lens to the fifth lens.

9. An imaging module, characterized in that: include: Image sensor; and The periscope lens according to any one of claims 1 to 8, wherein the image sensor is arranged on the image side of the fifth lens.

10. The imaging module according to claim 9, characterized in that: At least one of the plurality of optical elements is configured to translate or move along a corresponding optical axis to adjust a focus of an image at an imaging plane of the image sensor.

11. The imaging module according to claim 9, characterized in that: The image sensor is configured to translate or move along a corresponding optical axis to adjust the focus of an image at an imaging plane of the image sensor.

12. An electronic device, characterized in that: It comprises a shell and the imaging module according to any one of claims 9 to 11, wherein the imaging module is mounted on the shell.

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