Optical imaging system, imaging module and electronic device

Abstract

The present invention discloses an optical imaging system, an imaging module and an electronic device. The optical imaging system includes, from the object side to the image side, a first lens with positive refractive power, the object side of the first lens is convex at the near optical axis, and the image side is concave at the near optical axis; a second lens with positive refractive power, the object side of the second lens is convex at the near optical axis; a third lens with negative refractive power, the image side of the third lens is concave at the near optical axis; a fourth lens with refractive power; a fifth lens with refractive power; a sixth lens with refractive power; and a seventh lens with negative refractive power; the optical imaging system satisfies the following conditional formula: 0.5<(L72p1‑L72p2) / L72c. The above optical imaging system increases the focal length and improves the relative brightness while meeting the requirements of miniature design. Clear imaging effects can be achieved even in darker environments, and can be used to shoot distant views, improve the magnification, and have the functions of blurring the background and highlighting the subject.

Description

Technical Field

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

[0002] With the widespread use of electronic products such as mobile phones, tablets, drones, and computers in our lives, various scientific and technological products are gradually improved and innovated. Among them, the improvement and innovation of the shooting effects of imaging modules in electronic products has become one of the focuses of people's attention and has also become an important part of scientific and technological improvement.

[0003] In the process of implementing this application, the inventors found that there are at least the following problems in the prior art: With the improvement in the performance of photosensitive elements such as photocouplers (CCDs) and complementary metal oxide semiconductors (CMOSs) image sensors, higher requirements are placed on optical imaging systems. Whether optical imaging systems can be used to capture high-quality, high-resolution, and high-definition images, and even whether clear images can be captured under dark conditions, has become a key factor in modern people's choice of electronic products. Summary of the invention

[0004] In view of the above, it is necessary to propose an optical imaging system, an imaging module and an electronic device to solve the above problems.

[0005] An embodiment of the present application provides an optical imaging system, which includes, from the object side to the image side, the following:

[0006] A first lens having positive refractive power, wherein the object side surface of the first lens is convex at the near optical axis, and the image side surface of the first lens is concave at the near optical axis;

[0007] a second lens having positive refractive power, wherein the object side surface of the second lens is convex at a position close to the optical axis;

[0008] A third lens having negative refractive power, wherein the image side surface of the third lens is concave at the near optical axis;

[0009] a fourth lens having a refracting power;

[0010] A fifth lens having a refracting power;

[0011] a sixth lens having a refractive power; and

[0012] A seventh lens having negative refractive power;

[0013] The optical imaging system satisfies the following conditional formula:

[0014] 0.5<(L72p1-L72p2) / L72c;

[0015] Wherein, L72c represents the maximum effective aperture of the central light beam in the direction perpendicular to the optical axis when the central light beam passes through the image side surface of the seventh lens, and the central light beam is the light beam incident on the center of the imaging surface of the optical imaging system;

[0016] L72p1 represents the maximum vertical distance between the intersection of the edge light beam and the image side surface of the seventh lens and the optical axis, and L72p2 represents the minimum vertical distance between the intersection of the edge light beam and the image side surface of the seventh lens and the optical axis. The edge light beam is the light beam that is incident on the imaging surface of the optical imaging system and is farthest from the optical axis.

[0017] The above optical imaging system not only meets the requirements of miniature design, but also has a larger focal length and a smaller field of view than conventional optical imaging systems, thereby improving relative brightness, achieving clear imaging effects even in darker environments, and can be used to shoot distant scenes. It also improves the magnification ratio and has functions such as blurring the background and highlighting the subject.

[0018] In some embodiments, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens, and the seventh lens are all aspherical.

[0019] In this way, by adjusting the curvature radius and aspheric coefficient of each lens surface, the total length of the optical imaging system can be effectively reduced, and the aberration of the optical imaging system can be effectively corrected to improve the imaging quality.

[0020] In some embodiments, the optical imaging system satisfies the following condition:

[0021] TTL / Imgh<2.7;

[0022] Wherein, TTL is the distance from the object side of the first lens to the image plane of the optical imaging system on the optical axis, and Imgh is the image height corresponding to half of the maximum field of view of the optical imaging system.

[0023] In this way, when the image plane is fixed, the total length of the optical imaging system can be kept short, thereby achieving miniaturization of the optical imaging system.

[0024] In some embodiments, the optical imaging system satisfies the following condition:

[0025] TTL / f<1.2;

[0026] Wherein, TTL is the distance from the object side surface of the first lens to the image plane of the optical imaging system on the optical axis, and f is the effective focal length of the optical imaging system.

[0027] In this way, when the TTL is fixed and miniaturization is met, the effective focal length will have a lower limit, which can ensure the long focal length characteristics of the optical imaging system and achieve functions such as large magnification and depth of field blur.

[0028] In some embodiments, the optical imaging system satisfies the following condition:

[0029] -1.7 <f1_2 / f3_7<-0.5;

[0030] Wherein, f1_2 is the combined focal length of the first lens to the second lens; f3_7 is the combined focal length of the third lens to the seventh lens.

[0031] This helps to reasonably distribute the refractive forces of the two parts of the optical imaging system, better correct the chromatic aberration of the optical imaging system, and improve the performance of the optical imaging system.

[0032] In some embodiments, the optical imaging system satisfies the following condition:

[0033] FNO<1.9;

[0034] Wherein, FNO is the aperture number of the optical imaging system.

[0035] In this way, a large light flux of the optical imaging system can be achieved while maintaining the telephoto property of the optical imaging system. When the light flux of the optical imaging system per unit time is large, a clear imaging effect can be achieved even when shooting in a dark environment.

[0036] In some embodiments, the optical imaging system satisfies the following condition:

[0037] Imgh / tan(HFOV)>6mm;

[0038] Among them, Imgh is the image height corresponding to half of the maximum field of view of the optical imaging system, and HFOV is half of the maximum field of view of the optical imaging system.

[0039] In this way, the telephoto characteristics of the optical imaging system can be maintained and the imaging magnification can be increased.

[0040] In some embodiments, the optical imaging system satisfies the following condition:

[0041] ct1 / et1<3.5;

[0042] Wherein, ct1 is the thickness of the first lens on the optical axis, and et1 is the edge thickness of the first lens in the direction of the optical axis.

[0043] Thus, from the perspective of lens processability, the lens is easy to shape and has low cost.

[0044] An embodiment of the present application provides an imaging module, including:

[0045] The above optical imaging system; and

[0046] A photosensitive element is arranged on the image side of the optical imaging system.

[0047] The optical imaging system in the above-mentioned imaging module has a larger focal length while meeting the requirements of miniature design. The field of view is smaller than that of conventional optical imaging systems, which improves the relative brightness. Clear imaging effects can be achieved even in darker environments. It can be used to shoot distant scenes, improves the magnification, and has functions such as blurring the background and highlighting the subject.

[0048] An embodiment of the present application provides an electronic device, including:

[0049] housing; and

[0050] The above-mentioned imaging module is installed on the shell.

[0051] The optical imaging system in the above-mentioned electronic device not only meets the requirements of miniature design, but also has a larger focal length and a smaller field of view than conventional optical imaging systems, thereby improving relative brightness, achieving clear imaging effects even in darker environments, and can be used to shoot distant scenes. It also improves the magnification ratio and has functions such as blurring the background and highlighting the subject.

[0052] Additional aspects and advantages of the embodiments of the present invention will be given in part in the following description and in part will become apparent from the following description or will be learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] The above and / or additional aspects and advantages of the present invention may become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0054] Figure 1 FIG. 1 is a schematic diagram of a light path of an optical imaging system according to an embodiment of the present invention.

[0055] Figure 2 Schematic diagram of the structure of the optical imaging system according to the first embodiment of the present invention.

[0056] Figure 3 Schematic diagram of spherical aberration, astigmatism and distortion according to the first embodiment of the present invention.

[0057] Figure 4 Schematic diagram of the structure of an optical imaging system according to a second embodiment of the present invention.

[0058] Figure 5 Schematic diagram of spherical aberration, astigmatism and distortion according to the second embodiment of the present invention.

[0059] Figure 6 Schematic diagram of the structure of an optical imaging system according to the third embodiment of the present invention.

[0060] Figure 7 Schematic diagram of spherical aberration, astigmatism and distortion according to the third embodiment of the present invention.

[0061] Figure 8 4 is a schematic structural diagram of an optical imaging system according to a fourth embodiment of the present invention.

[0062] Fig. 9 Schematic diagram of spherical aberration, astigmatism and distortion according to the fourth embodiment of the present invention.

[0063] Fig.10 4 is a schematic structural diagram of an optical imaging system according to a fifth embodiment of the present invention.

[0064] Fig.11 Schematic diagram of spherical aberration, astigmatism and distortion of the fifth embodiment of the present invention.

[0065] Fig.12 4 is a schematic structural diagram of an optical imaging system according to a sixth embodiment of the present invention.

[0066] Fig.13 Schematic diagram of spherical aberration, astigmatism and distortion of the sixth embodiment of the present invention.

[0067] Fig.14 Schematic diagram of the structure of an electronic device according to an embodiment of the present invention.

[0068] Main component symbols

[0069] Electronic device 1000

[0070] Image acquisition module 100

[0071] Optical imaging system 10

[0072] First lens L1

[0073] Second lens L2

[0074] The third lens L3

[0075] The fourth lens L4

[0076] Fifth lens L5

[0077] Sixth lens L6

[0078] Seventh lens L7

[0079] Infrared cut filter L8

[0080] Aperture STO

[0081] Object side S1, S3, S5, S7, S9, S11, S13, S15

[0082] Like side S2, S4, S6, S8, S10, S12, S14, S16

[0083] Image plane S17

[0084] Photosensitive element 20

[0085] Housing 200 DETAILED DESCRIPTION

[0086] 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.

[0087] See also Figure 1 The following is a description of the terms involved in the embodiments of the present application:

[0088] Field of view (FOV): In optical instruments, the angle formed by the two edges of the maximum range through which the image of the object can pass through the lens, with the lens of the optical instrument as the vertex, is called the field of view. The size of the field of view determines the field of view of the optical instrument. The larger the field of view, the larger the field of view. In other words, objects within the field of view can be photographed through the lens, and objects outside the field of view are invisible. The entire visible range corresponds one-to-one to the imaging surface of the optical instrument, and is evenly distributed into N parts from the optical axis on the imaging surface. The light of the central field of view (central light beam) converges at the optical axis and is recorded as 0 field of view. The light of the edge field of view (edge ​​light beam) converges at the farthest point from the axis and is recorded as 1.0 field of view. 0 to 0.5 is the inner field of view, and 0.6 to 1.0 is the outer field of view.

[0089] See also Figure 2 An embodiment of the present invention proposes an optical imaging system 10, which includes, from the object side to the image side, a first lens L1 with positive refractive power, a second lens L2 with positive refractive power, a third lens L3 with negative refractive power, a fourth lens L4 with refractive power, a fifth lens L5 with refractive power, a sixth lens L6 with refractive power, and a seventh lens L7 with negative refractive power.

[0090] The first lens L1 has an object-side surface S1 and an image-side surface S2, the object-side surface S1 of the first lens L1 is convex at the near optical axis, and the image-side surface S2 is concave at the near optical axis; the second lens L2 has an object-side surface S3 and an image-side surface S4, the object-side surface S3 of the second lens L2 is convex at the near optical axis; the third lens L3 has an object-side surface S5 and an image-side surface S6, the image-side surface S6 of the third lens L3 is concave at the near optical axis; the fourth lens L4 has an object-side surface S7 and an image-side surface S8; the fifth lens L5 has an object-side surface S9 and an image-side surface S10; the sixth lens L6 has an object-side surface S11 and an image-side surface S12; the seventh lens L7 has an object-side surface S13 and an image-side surface S14.

[0091] The optical imaging system 10 satisfies the following conditional formula:

[0092] 0.5<(L72p1-L72p2) / L72c;

[0093] Among them, Figure 1 As shown, L72c represents the maximum effective aperture of the central light beam in the direction perpendicular to the optical axis when the central light beam passes through the image side surface S14 of the seventh lens L7, and the central light beam is a light beam incident on the center of the imaging surface of the optical imaging system 10;

[0094] L72p1 represents the maximum vertical distance between the intersection of the edge light beam and the image side surface S14 of the seventh lens L7 and the optical axis, and L72p2 represents the minimum vertical distance between the intersection of the edge light beam and the image side surface S14 of the seventh lens L7 and the optical axis. The edge light beam is the light beam that is incident on the imaging surface of the optical imaging system 10 and is farthest from the optical axis.

[0095] The optical imaging system 10 has a larger focal length while meeting the requirements of miniature design, and its field of view is smaller than that of conventional optical imaging systems, thereby improving relative brightness, and achieving clear imaging effects even in darker environments. It can also be used to shoot distant scenes, improve magnification, and has functions such as blurring the background and highlighting the subject. However, when (L72p1-L72p2) / L72c does not meet the above conditional expression, the edge brightness of the optical imaging system 10 is insufficient, and dark corners are prone to occur.

[0096] In some embodiments, the optical imaging system 10 further includes a stop STO. The stop STO can be disposed on the surface of any lens, or disposed before the first lens L1, or disposed between any two lenses, or disposed on the image side surface S14 of the seventh lens L7. Figure 2 , the stop STO is disposed on the object-side surface S1 of the first lens L1.

[0097] In some embodiments, the optical imaging system 10 further includes an infrared cut-off filter L8, and the infrared cut-off filter L8 has an object-side surface S15 and an image-side surface S16. The infrared cut-off filter L8 is disposed on the image side of the seventh lens L7 to filter out light of other wavelengths such as visible light and only allow infrared light to pass, so that the optical imaging system 10 can also form images in dim environments and other special application scenarios.

[0098] In some embodiments, the first lens L1 , the second lens L2 , the third lens L3 , the fourth lens L4 , the fifth lens L5 , the sixth lens L6 , and the seventh lens L7 are all aspherical surfaces.

[0099] In this way, by adjusting the curvature radius and aspheric coefficient of each lens surface, the total length of the optical imaging system 10 can be effectively reduced, and the aberration of the optical imaging system 10 can be effectively corrected to improve the imaging quality.

[0100] In some embodiments, the optical imaging system 10 satisfies the following conditional formula:

[0101] TTL / Imgh<2.7;

[0102] Wherein, TTL is the distance on the optical axis from the object-side surface S1 of the first lens L1 to the image surface S17 of the optical imaging system 10 , and Imgh is the image height corresponding to half of the maximum field angle of the optical imaging system 10 .

[0103] In this way, when the image plane S17 is fixed, the total length of the optical imaging system 10 can be kept short, thereby achieving miniaturization of the optical imaging system 10 .

[0104] In some embodiments, the optical imaging system 10 satisfies the following conditional formula:

[0105] TTL / f<1.2;

[0106] Wherein, TTL is the distance on the optical axis from the object-side surface S1 of the first lens L1 to the image surface S17 of the optical imaging system 10 , and f is the effective focal length of the optical imaging system 10 .

[0107] In this way, when TTL is fixed and miniaturization is satisfied, the effective focal length will have a lower limit value, which can ensure the long focal length characteristics of the optical imaging system 10 and achieve functions such as large magnification and depth of field blur. However, when TTL / f does not satisfy the above conditional expression, the long focal length characteristics of the optical imaging system 10 cannot be satisfied.

[0108] In some embodiments, the optical imaging system 10 satisfies the following conditional formula:

[0109] -1.7 <f1_2 / f3_7<-0.5;

[0110] Wherein, f1_2 is the combined focal length of the first lens L1 to the second lens L2; ​​f3_7 is the combined focal length of the third lens L3 to the seventh lens L7.

[0111] In this way, it is helpful to reasonably distribute the refractive force of the two parts of the optical imaging system 10, which can better correct the chromatic aberration of the optical imaging system 10 and improve the performance of the optical imaging system 10, wherein the first part includes the first lens L1 to the second lens L2, and the second part includes the third lens L3 to the seventh lens L7. However, when f1_2 / f3_7 does not meet the above conditional formula, the refractive force of the two parts cannot be reasonably matched, resulting in an increase in the MTF (modulation transfer function) sensitivity of one side, which is not conducive to actual production and processing.

[0112] In some embodiments, the optical imaging system 10 satisfies the following conditional formula:

[0113] FNO<1.9;

[0114] Wherein, FNO is the aperture number of the optical imaging system 10 .

[0115] In this way, a large light flux of the optical imaging system 10 can be achieved while maintaining the telephoto property of the optical imaging system 10. When the light flux per unit time of the optical imaging system 10 is large, a clear imaging effect can be achieved even in a dark environment. However, when the FNO does not meet the above conditional expression, the shooting effect in a dark environment is not good.

[0116] In some embodiments, the optical imaging system 10 satisfies the following conditional formula:

[0117] Imgh / tan(HFOV)>6mm;

[0118] Among them, Imgh is the image height corresponding to half of the maximum field of view of the optical imaging system 10, and HFOV is half of the maximum field of view of the optical imaging system 10.

[0119] In this way, the telephoto characteristic of the optical imaging system 10 can be maintained and the imaging magnification can be increased. However, when Imgh / tan(HFOV) does not satisfy the above conditional expression, the telephoto characteristic of the optical imaging system 10 cannot be guaranteed.

[0120] In some embodiments, the optical imaging system 10 satisfies the following conditional formula:

[0121] ct1 / et1<3.5;

[0122] Wherein, ct1 is the thickness of the first lens L1 on the optical axis, and et1 is the edge thickness of the first lens L1 in the optical axis direction.

[0123] Thus, from the perspective of lens processability, the lens is easy to mold and has low cost. However, when ct1 / et1 does not meet the above conditional formula, the lens will be difficult to mold in actual production and difficult to process and mass produce.

[0124] First embodiment

[0125] See also Figure 2 and Figure 3 In the optical imaging system 10 in this embodiment, from the object side to the image side, it includes an aperture STO, a first lens L1 with positive refractive power, a second lens L2 with positive refractive power, a third lens L3 with negative refractive power, a fourth lens L4 with negative refractive power, a fifth lens L5 with positive refractive power, a sixth lens L6 with positive refractive power, a seventh lens L7 with negative refractive power and an infrared cut-off filter L8.

[0126] The object-side surface S1 of the first lens L1 is convex at the near optical axis, the image-side surface S2 of the first lens L1 is concave at the near optical axis, the object-side surface S3 of the second lens L2 is convex at the near optical axis, the image-side surface S4 of the second lens L2 is concave at the near optical axis, the object-side surface S5 of the third lens L3 is convex at the near optical axis, the image-side surface S6 of the third lens L3 is concave at the near optical axis, the object-side surface S7 of the fourth lens L4 is convex at the near optical axis, and the fourth The image side surface S8 of the lens L4 is concave at the near optical axis, the object side surface S9 of the fifth lens L5 is convex at the near optical axis, the image side surface S10 of the fifth lens L5 is concave at the near optical axis, the object side surface S11 of the sixth lens L6 is convex at the near optical axis, the image side surface S12 of the sixth lens L6 is concave at the near optical axis, the object side surface S13 of the seventh lens L7 is convex at the near optical axis, and the image side surface S14 of the seventh lens L7 is concave at the near optical axis.

[0127] The object-side surface S1 of the first lens L1 is concave near the circumference, the image-side surface S2 of the first lens L1 is convex near the circumference, the object-side surface S3 of the second lens L2 is concave near the circumference, the image-side surface S4 of the second lens L2 is convex near the circumference, the object-side surface S5 of the third lens L3 is convex near the circumference, the image-side surface S6 of the third lens L3 is convex near the circumference, the object-side surface S7 of the fourth lens L4 is concave near the circumference, and the fourth The image side surface S8 of the lens L4 is convex near the circumference, the object side surface S9 of the fifth lens L5 is concave near the circumference, the image side surface S10 of the fifth lens L5 is convex near the circumference, the object side surface S11 of the sixth lens L6 is concave near the circumference, the image side surface S12 of the sixth lens L6 is concave near the circumference, the object side surface S13 of the seventh lens L7 is convex near the circumference, and the image side surface S14 of the seventh lens L7 is concave near the circumference.

[0128] When the optical imaging system 10 is used for imaging, the light emitted or reflected by the object enters the optical imaging system 10 from the object side, and passes through the aperture STO, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the infrared cut-off filter L8 in sequence, and finally converges on the image plane S17.

[0129] Table 1 shows the characteristics of the optical imaging system of this embodiment, wherein the reference wavelength of the focal length is 555 nm, the reference wavelengths of the refractive index and the Abbe number are both 587.56 nm, and the units of the Y radius, thickness and focal length are all millimeters (mm).

[0130] Table 1

[0131]

[0132]

[0133] Wherein, f is the effective focal length of the optical imaging system 10, FNO is the aperture number of the optical imaging system 10, FOV is the maximum field angle of the optical imaging system 10, and TTL is the distance from the object side surface S1 of the first lens L1 to the image surface S17 of the optical imaging system 10 on the optical axis.

[0134] In this embodiment, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 are all aspherical surfaces, and the surface shape Z of each spherical lens can be defined by but not limited to the following aspherical surface formula.

[0135]

[0136] Among them, Z is the longitudinal distance between any point on the aspheric surface and the surface vertex, r is the distance from any point on the aspheric surface to the optical axis, c is the vertex curvature (the inverse of the radius of curvature), k is the cone constant, Ai is the correction coefficient of the i-th order aspheric surface, and Table 2 gives the high-order coefficients K, A4, A6, A8, A10... that can be used for each spherical mirror S1-S14 in the first embodiment.

[0137] Table 2

[0138]

[0139]

[0140] Table 2 shows the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical imaging system 10 of the first embodiment, wherein the longitudinal spherical aberration curve indicates the deviation of the focal point of light of different wavelengths after passing through each lens of the optical imaging system 10; the astigmatism curve indicates the meridional image curvature and the sagittal image curvature; and the distortion curve indicates the distortion magnitude value corresponding to different field angles. It can be seen from Table 2 that the optical imaging system 10 provided in the first embodiment can achieve good imaging quality.

[0141] Second embodiment

[0142] See also Figure 4 and Figure 5 In the optical imaging system 10 in this embodiment, from the object side to the image side, it includes an aperture STO, a first lens L1 with positive refractive power, a second lens L2 with positive refractive power, a third lens L3 with negative refractive power, a fourth lens L4 with positive refractive power, a fifth lens L5 with positive refractive power, a sixth lens L6 with positive refractive power, a seventh lens L7 with negative refractive power and an infrared cut-off filter L8.

[0143] The object-side surface S1 of the first lens L1 is convex at the near optical axis, the image-side surface S2 of the first lens L1 is concave at the near optical axis, the object-side surface S3 of the second lens L2 is convex at the near optical axis, the image-side surface S4 of the second lens L2 is convex at the near optical axis, the object-side surface S5 of the third lens L3 is convex at the near optical axis, the image-side surface S6 of the third lens L3 is concave at the near optical axis, the object-side surface S7 of the fourth lens L4 is concave at the near optical axis, and the fourth The image side surface S8 of the lens L4 is convex at the near optical axis, the object side surface S9 of the fifth lens L5 is convex at the near optical axis, the image side surface S10 of the fifth lens L5 is concave at the near optical axis, the object side surface S11 of the sixth lens L6 is convex at the near optical axis, the image side surface S12 of the sixth lens L6 is concave at the near optical axis, the object side surface S13 of the seventh lens L7 is concave at the near optical axis, and the image side surface S14 of the seventh lens L7 is concave at the near optical axis.

[0144] The object-side surface S1 of the first lens L1 is concave near the circumference, the image-side surface S2 of the first lens L1 is convex near the circumference, the object-side surface S3 of the second lens L2 is concave near the circumference, the image-side surface S4 of the second lens L2 is convex near the circumference, the object-side surface S5 of the third lens L3 is convex near the circumference, the image-side surface S6 of the third lens L3 is concave near the circumference, the object-side surface S7 of the fourth lens L4 is concave near the circumference, and the fourth The image side surface S8 of the lens L4 is concave near the circumference, the object side surface S9 of the fifth lens L5 is concave near the circumference, the image side surface S10 of the fifth lens L5 is convex near the circumference, the object side surface S11 of the sixth lens L6 is concave near the circumference, the image side surface S12 of the sixth lens L6 is concave near the circumference, the object side surface S13 of the seventh lens L7 is convex near the circumference, and the image side surface S14 of the seventh lens L7 is concave near the circumference.

[0145] When the optical imaging system 10 is used for imaging, the light emitted or reflected by the object enters the optical imaging system 10 from the object side, and passes through the aperture STO, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the infrared cut-off filter L8 in sequence, and finally converges on the image plane S17.

[0146] Table 3 shows the characteristics of the optical imaging system 10 of this embodiment, wherein the reference wavelength of the focal length is 555 nm, the reference wavelengths of the refractive index and the Abbe number are both 587.56 nm, and the units of the Y radius, thickness and focal length are all millimeters (mm).

[0147] Table 3

[0148]

[0149] Wherein, f is the effective focal length of the optical imaging system 10, FNO is the aperture number of the optical imaging system 10, FOV is the maximum field angle of the optical imaging system 10, and TTL is the distance from the object side surface S1 of the first lens L1 to the image surface S17 of the optical imaging system 10 on the optical axis.

[0150] In this embodiment, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 are all aspherical surfaces, and the surface shape Z of each spherical lens can be defined by but not limited to the following aspherical surface formula.

[0151]

[0152] Among them, Z is the longitudinal distance between any point on the aspheric surface and the surface vertex, r is the distance from any point on the aspheric surface to the optical axis, c is the vertex curvature (the inverse of the radius of curvature), k is the cone constant, Ai is the correction coefficient of the i-th order aspheric surface, and Table 4 gives the high-order coefficients K, A4, A6, A8, A10... that can be used for each spherical mirror S1-S14 in the second embodiment.

[0153] Table 4

[0154]

[0155]

[0156] Table 4 shows the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical imaging system 10 of the second embodiment, wherein the longitudinal spherical aberration curve indicates the deviation of the focal point of light of different wavelengths after passing through each lens of the optical imaging system 10; the astigmatism curve indicates the meridional image curvature and the sagittal image curvature; and the distortion curve indicates the distortion magnitude value corresponding to different field angles. According to Table 4, it can be seen that the optical imaging system 10 provided in the second embodiment can achieve good imaging quality.

[0157] Third embodiment

[0158] See also Figure 6 and Figure 7 In the optical imaging system 10 in this embodiment, from the object side to the image side, it includes an aperture STO, a first lens L1 with positive refractive power, a second lens L2 with positive refractive power, a third lens L3 with negative refractive power, a fourth lens L4 with negative refractive power, a fifth lens L5 with positive refractive power, a sixth lens L6 with negative refractive power, a seventh lens L7 with negative refractive power and an infrared cut-off filter L8.

[0159] The object-side surface S1 of the first lens L1 is convex at the near optical axis, the image-side surface S2 of the first lens L1 is concave at the near optical axis, the object-side surface S3 of the second lens L2 is convex at the near optical axis, the image-side surface S4 of the second lens L2 is concave at the near optical axis, the object-side surface S5 of the third lens L3 is convex at the near optical axis, the image-side surface S6 of the third lens L3 is concave at the near optical axis, the object-side surface S7 of the fourth lens L4 is convex at the near optical axis, and the fourth The image side surface S8 of the lens L4 is concave at the near optical axis, the object side surface S9 of the fifth lens L5 is convex at the near optical axis, the image side surface S10 of the fifth lens L5 is convex at the near optical axis, the object side surface S11 of the sixth lens L6 is concave at the near optical axis, the image side surface S12 of the sixth lens L6 is convex at the near optical axis, the object side surface S13 of the seventh lens L7 is convex at the near optical axis, and the image side surface S14 of the seventh lens L7 is concave at the near optical axis.

[0160] The object-side surface S1 of the first lens L1 is concave near the circumference, the image-side surface S2 of the first lens L1 is convex near the circumference, the object-side surface S3 of the second lens L2 is convex near the circumference, the image-side surface S4 of the second lens L2 is concave near the circumference, the object-side surface S5 of the third lens L3 is convex near the circumference, the image-side surface S6 of the third lens L3 is concave near the circumference, the object-side surface S7 of the fourth lens L4 is concave near the circumference, and the fourth The image side surface S8 of the lens L4 is convex near the circumference, the object side surface S9 of the fifth lens L5 is concave near the circumference, the image side surface S10 of the fifth lens L5 is convex near the circumference, the object side surface S11 of the sixth lens L6 is concave near the circumference, the image side surface S12 of the sixth lens L6 is concave near the circumference, the object side surface S13 of the seventh lens L7 is convex near the circumference, and the image side surface S14 of the seventh lens L7 is concave near the circumference.

[0161] When the optical imaging system 10 is used for imaging, the light emitted or reflected by the object enters the optical imaging system 10 from the object side, and passes through the aperture STO, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the infrared cut-off filter L8 in sequence, and finally converges on the image plane S17.

[0162] Table 5 shows the characteristics of the optical imaging system 10 of this embodiment, wherein the reference wavelength of the focal length is 555 nm, the reference wavelengths of the refractive index and the Abbe number are both 587.56 nm, and the units of the Y radius, thickness and focal length are all millimeters (mm).

[0163] Table 5

[0164]

[0165] Wherein, f is the effective focal length of the optical imaging system 10, FNO is the aperture number of the optical imaging system 10, FOV is the maximum field angle of the optical imaging system 10, and TTL is the distance from the object side surface S1 of the first lens L1 to the image surface S17 of the optical imaging system 10 on the optical axis.

[0166] In this embodiment, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 are all aspherical surfaces, and the surface shape Z of each spherical lens can be defined by but not limited to the following aspherical surface formula.

[0167]

[0168] Among them, Z is the longitudinal distance between any point on the aspherical surface and the surface vertex, r is the distance from any point on the aspherical surface to the optical axis, c is the vertex curvature (the inverse of the radius of curvature), k is the cone constant, Ai is the correction coefficient of the i-th order aspherical surface, and Table 6 gives the high-order coefficients K, A4, A6, A8, A10... that can be used for each spherical mirror S1-S14 in the third embodiment.

[0169] Table 6

[0170] Surface number K A4 A6 A8 A10 S1 -0.7263 0.0016 0.0000 0.0001 -0.0001 S2 -5.0303 -0.0170 0.0172 -0.0105 0.0043 S3 0.5112 -0.0213 0.0179 -0.0106 0.0041 S4 -18.0000 -0.0448 0.0458 -0.0323 0.0165 S5 19.4127 -0.0449 0.0443 -0.0339 0.0193 S6 0.9450 -0.0050 0.0072 -0.0094 0.0080 S7 -38.0000 -0.0108 -0.0017 -0.0013 0.0010 S8 0.0000 -0.0223 -0.0001 0.0018 -0.0045 S9 -38.0000 -0.0115 -0.0036 0.0030 -0.0046 S10 -3.4610 -0.0159 0.0002 -0.0003 -0.0003 S11 1.0730 -0.0126 -0.0029 -0.0022 0.0028 S12 -38.0000 -0.0014 -0.0023 -0.0027 0.0025 S13 1.2080 -0.0558 0.0243 -0.0139 0.0063 S14 -17.5480 -0.0129 -0.0032 0.0021 -0.0006 Surface number A12 A14 A16 A18 A20 S1 0.0000 0.0000 0.0000 0.0000 0.0000 S2 -0.0012 0.0002 0.0000 0.0000 0.0000 S3 -0.0010 0.0002 0.0000 0.0000 0.0000 S4 -0.0060 0.0015 -0.0002 0.0000 0.0000 S5 -0.0078 0.0021 -0.0004 0.0000 0.0000 S6 -0.0044 0.0017 -0.0004 0.0001 0.0000 S7 -0.0005 0.0002 -0.0001 0.0000 0.0000 S8 0.0043 -0.0022 0.0007 -0.0001 0.0000 S9 0.0033 -0.0016 0.0005 -0.0001 0.0000 S10 0.0001 -0.0001 0.0000 0.0000 0.0000 S11 -0.0015 0.0004 -0.0001 0.0000 0.0000 S12 -0.0010 0.0003 0.0000 0.0000 0.0000 S13 -0.0020 0.0004 -0.0001 0.0000 0.0000 S14 0.0001 0.0000 0.0000 0.0000 0.0000

[0171] Table 6 shows the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical imaging system 10 of the third embodiment, wherein the longitudinal spherical aberration curve indicates the deviation of the focal point of light of different wavelengths after passing through each lens of the optical imaging system 10; the astigmatism curve indicates the meridional image curvature and the sagittal image curvature; and the distortion curve indicates the distortion magnitude value corresponding to different field angles. According to Table 6, it can be seen that the optical imaging system 10 provided in the third embodiment can achieve good imaging quality.

[0172] Fourth embodiment

[0173] See also Figure 8 and Fig. 9 In the optical imaging system 10 in this embodiment, from the object side to the image side, it includes an aperture STO, a first lens L1 with positive refractive power, a second lens L2 with positive refractive power, a third lens L3 with negative refractive power, a fourth lens L4 with positive refractive power, a fifth lens L5 with negative refractive power, a sixth lens L6 with positive refractive power, a seventh lens L7 with negative refractive power and an infrared cut-off filter L8.

[0174] The object-side surface S1 of the first lens L1 is convex at the near optical axis, the image-side surface S2 of the first lens L1 is concave at the near optical axis, the object-side surface S3 of the second lens L2 is convex at the near optical axis, the image-side surface S4 of the second lens L2 is convex at the near optical axis, the object-side surface S5 of the third lens L3 is concave at the near optical axis, the image-side surface S6 of the third lens L3 is concave at the near optical axis, the object-side surface S7 of the fourth lens L4 is convex at the near optical axis, and the fourth The image side surface S8 of the lens L4 is concave at the near optical axis, the object side surface S9 of the fifth lens L5 is concave at the near optical axis, the image side surface S10 of the fifth lens L5 is convex at the near optical axis, the object side surface S11 of the sixth lens L6 is convex at the near optical axis, the image side surface S12 of the sixth lens L6 is concave at the near optical axis, the object side surface S13 of the seventh lens L7 is concave at the near optical axis, and the image side surface S14 of the seventh lens L7 is convex at the near optical axis.

[0175] The object-side surface S1 of the first lens L1 is convex near the circumference, the image-side surface S2 of the first lens L1 is convex near the circumference, the object-side surface S3 of the second lens L2 is convex near the circumference, the image-side surface S4 of the second lens L2 is concave near the circumference, the object-side surface S5 of the third lens L3 is concave near the circumference, the image-side surface S6 of the third lens L3 is concave near the circumference, the object-side surface S7 of the fourth lens L4 is concave near the circumference, and the fourth The image side surface S8 of the lens L4 is convex near the circumference, the object side surface S9 of the fifth lens L5 is concave near the circumference, the image side surface S10 of the fifth lens L5 is convex near the circumference, the object side surface S11 of the sixth lens L6 is concave near the circumference, the image side surface S12 of the sixth lens L6 is concave near the circumference, the object side surface S13 of the seventh lens L7 is convex near the circumference, and the image side surface S14 of the seventh lens L7 is convex near the circumference.

[0176] When the optical imaging system 10 is used for imaging, the light emitted or reflected by the object enters the optical imaging system 10 from the object side, and passes through the aperture STO, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the infrared cut-off filter L8 in sequence, and finally converges on the image plane S17.

[0177] Table 7 shows the characteristics of the optical imaging system 10 of this embodiment, wherein the reference wavelength of the focal length is 555 nm, the reference wavelengths of the refractive index and the Abbe number are both 587.56 nm, and the units of the Y radius, thickness and focal length are all millimeters (mm).

[0178] Table 7

[0179]

[0180]

[0181] Wherein, f is the effective focal length of the optical imaging system 10, FNO is the aperture number of the optical imaging system 10, FOV is the maximum field angle of the optical imaging system 10, and TTL is the distance from the object side surface S1 of the first lens L1 to the image surface S17 of the optical imaging system 10 on the optical axis.

[0182] In this embodiment, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 are all aspherical surfaces, and the surface shape Z of each spherical lens can be defined by but not limited to the following aspherical surface formula.

[0183]

[0184] Among them, Z is the longitudinal distance between any point on the aspheric surface and the surface vertex, r is the distance from any point on the aspheric surface to the optical axis, c is the vertex curvature (the inverse of the radius of curvature), k is the cone constant, Ai is the correction coefficient of the i-th order aspheric surface, and Table 8 gives the high-order coefficients K, A4, A6, A8, A10... that can be used for each spherical mirror surface S1-S14 in the fourth embodiment.

[0185] Table 8

[0186]

[0187]

[0188] Table 8 shows the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical imaging system 10 of the fourth embodiment, wherein the longitudinal spherical aberration curve indicates the deviation of the focal point of light of different wavelengths after passing through each lens of the optical imaging system 10; the astigmatism curve indicates the meridional image curvature and the sagittal image curvature; and the distortion curve indicates the distortion magnitude value corresponding to different field angles. According to Table 8, it can be seen that the optical imaging system 10 provided in the fourth embodiment can achieve good imaging quality.

[0189] Fifth embodiment

[0190] See also Fig.10 and Fig.11 In the optical imaging system 10 in this embodiment, from the object side to the image side, it includes an aperture STO, a first lens L1 with positive refractive power, a second lens L2 with positive refractive power, a third lens L3 with negative refractive power, a fourth lens L4 with negative refractive power, a fifth lens L5 with positive refractive power, a sixth lens L6 with positive refractive power, a seventh lens L7 with negative refractive power and an infrared cut-off filter L8.

[0191] The object-side surface S1 of the first lens L1 is convex at the near optical axis, the image-side surface S2 of the first lens L1 is concave at the near optical axis, the object-side surface S3 of the second lens L2 is convex at the near optical axis, the image-side surface S4 of the second lens L2 is convex at the near optical axis, the object-side surface S5 of the third lens L3 is convex at the near optical axis, the image-side surface S6 of the third lens L3 is concave at the near optical axis, the object-side surface S7 of the fourth lens L4 is concave at the near optical axis, and the fourth The image side surface S8 of the lens L4 is convex at the near optical axis, the object side surface S9 of the fifth lens L5 is convex at the near optical axis, the image side surface S10 of the fifth lens L5 is convex at the near optical axis, the object side surface S11 of the sixth lens L6 is convex at the near optical axis, the image side surface S12 of the sixth lens L6 is concave at the near optical axis, the object side surface S13 of the seventh lens L7 is convex at the near optical axis, and the image side surface S14 of the seventh lens L7 is concave at the near optical axis.

[0192] The object-side surface S1 of the first lens L1 is convex near the circumference, the image-side surface S2 of the first lens L1 is convex near the circumference, the object-side surface S3 of the second lens L2 is convex near the circumference, the image-side surface S4 of the second lens L2 is concave near the circumference, the object-side surface S5 of the third lens L3 is concave near the circumference, the image-side surface S6 of the third lens L3 is concave near the circumference, the object-side surface S7 of the fourth lens L4 is concave near the circumference, and the fourth The image side surface S8 of the lens L4 is convex near the circumference, the object side surface S9 of the fifth lens L5 is concave near the circumference, the image side surface S10 of the fifth lens L5 is convex near the circumference, the object side surface S11 of the sixth lens L6 is concave near the circumference, the image side surface S12 of the sixth lens L6 is concave near the circumference, the object side surface S13 of the seventh lens L7 is convex near the circumference, and the image side surface S14 of the seventh lens L7 is convex near the circumference.

[0193] When the optical imaging system 10 is used for imaging, the light emitted or reflected by the object enters the optical imaging system 10 from the object side, and passes through the aperture STO, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the infrared cut-off filter L8 in sequence, and finally converges on the image plane S17.

[0194] Table 9 shows the characteristics of the optical imaging system 10 of this embodiment, wherein the reference wavelength of the focal length is 555 nm, the reference wavelengths of the refractive index and the Abbe number are both 587.56 nm, and the units of the Y radius, thickness and focal length are all millimeters (mm).

[0195] Form 9

[0196]

[0197]

[0198] Wherein, f is the effective focal length of the optical imaging system 10, FNO is the aperture number of the optical imaging system 10, FOV is the maximum field angle of the optical imaging system 10, and TTL is the distance from the object side surface S1 of the first lens L1 to the image surface S17 of the optical imaging system 10 on the optical axis.

[0199] In this embodiment, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 are all aspherical surfaces, and the surface shape Z of each spherical lens can be defined by but not limited to the following aspherical surface formula.

[0200]

[0201] Among them, Z is the longitudinal distance between any point on the aspheric surface and the surface vertex, r is the distance from any point on the aspheric surface to the optical axis, c is the vertex curvature (the inverse of the radius of curvature), k is the cone constant, Ai is the correction coefficient of the i-th order aspheric surface, and Table 10 gives the high-order coefficients K, A4, A6, A8, A10... that can be used for each spherical mirror S1-S14 in the fifth embodiment.

[0202] Table 10

[0203]

[0204]

[0205] Table 10 shows the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical imaging system 10 of the fifth embodiment, wherein the longitudinal spherical aberration curve indicates the deviation of the convergence point of light of different wavelengths after passing through each lens of the optical imaging system 10; the astigmatism curve indicates the meridional image curvature and the sagittal image curvature; and the distortion curve indicates the distortion magnitude value corresponding to different field angles. According to Table 10, it can be seen that the optical imaging system 10 provided in the fifth embodiment can achieve good imaging quality.

[0206] Sixth embodiment

[0207] See also Fig.12 and Fig.13 In the optical imaging system 10 in this embodiment, from the object side to the image side, it includes an aperture STO, a first lens L1 with positive refractive power, a second lens L2 with positive refractive power, a third lens L3 with negative refractive power, a fourth lens L4 with negative refractive power, a fifth lens L5 with positive refractive power, a sixth lens L6 with positive refractive power, a seventh lens L7 with negative refractive power and an infrared cut-off filter L8.

[0208] The object-side surface S1 of the first lens L1 is convex at the near optical axis, the image-side surface S2 of the first lens L1 is concave at the near optical axis, the object-side surface S3 of the second lens L2 is convex at the near optical axis, the image-side surface S4 of the second lens L2 is concave at the near optical axis, the object-side surface S5 of the third lens L3 is convex at the near optical axis, the image-side surface S6 of the third lens L3 is concave at the near optical axis, the object-side surface S7 of the fourth lens L4 is concave at the near optical axis, and the fourth The image side surface S8 of the lens L4 is concave at the near optical axis, the object side surface S9 of the fifth lens L5 is convex at the near optical axis, the image side surface S10 of the fifth lens L5 is concave at the near optical axis, the object side surface S11 of the sixth lens L6 is convex at the near optical axis, the image side surface S12 of the sixth lens L6 is concave at the near optical axis, the object side surface S13 of the seventh lens L7 is convex at the near optical axis, and the image side surface S14 of the seventh lens L7 is concave at the near optical axis.

[0209] The object-side surface S1 of the first lens L1 is concave near the circumference, the image-side surface S2 of the first lens L1 is convex near the circumference, the object-side surface S3 of the second lens L2 is concave near the circumference, the image-side surface S4 of the second lens L2 is convex near the circumference, the object-side surface S5 of the third lens L3 is convex near the circumference, the image-side surface S6 of the third lens L3 is concave near the circumference, the object-side surface S7 of the fourth lens L4 is concave near the circumference, and the fourth The image side surface S8 of the lens L4 is convex near the circumference, the object side surface S9 of the fifth lens L5 is concave near the circumference, the image side surface S10 of the fifth lens L5 is convex near the circumference, the object side surface S11 of the sixth lens L6 is concave near the circumference, the image side surface S12 of the sixth lens L6 is concave near the circumference, the object side surface S13 of the seventh lens L7 is convex near the circumference, and the image side surface S14 of the seventh lens L7 is concave near the circumference.

[0210] When the optical imaging system 10 is used for imaging, the light emitted or reflected by the object enters the optical imaging system 10 from the object side, and passes through the aperture STO, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the infrared cut-off filter L8 in sequence, and finally converges on the image plane S17.

[0211] Table 11 shows the characteristics of the optical imaging system 10 of this embodiment, wherein the reference wavelength of the focal length is 555 nm, the reference wavelengths of the refractive index and the Abbe number are both 587.56 nm, and the units of the Y radius, thickness and focal length are all millimeters (mm).

[0212] Table 11

[0213]

[0214] Wherein, f is the effective focal length of the optical imaging system 10, FNO is the aperture number of the optical imaging system 10, FOV is the maximum field angle of the optical imaging system 10, and TTL is the distance from the object side surface S1 of the first lens L1 to the image surface S17 of the optical imaging system 10 on the optical axis.

[0215] In this embodiment, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 are all aspherical surfaces, and the surface shape Z of each spherical lens can be defined by but not limited to the following aspherical surface formula.

[0216]

[0217] Among them, Z is the longitudinal distance between any point on the aspheric surface and the surface vertex, r is the distance from any point on the aspheric surface to the optical axis, c is the vertex curvature (the inverse of the radius of curvature), k is the cone constant, Ai is the correction coefficient of the i-th order aspheric surface, and Table 12 gives the high-order coefficients K, A4, A6, A8, A10... that can be used for each spherical mirror surface S1-S14 in the sixth embodiment.

[0218] Table 12

[0219]

[0220]

[0221] Table 12 shows the longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical imaging system 10 of the sixth embodiment, wherein the longitudinal spherical aberration curve indicates the deviation of the focal point of light of different wavelengths after passing through each lens of the optical imaging system 10; the astigmatism curve indicates the meridional image curvature and the sagittal image curvature; and the distortion curve indicates the distortion magnitude value corresponding to different field angles. According to Table 12, it can be seen that the optical imaging system 10 provided in the sixth embodiment can achieve good imaging quality.

[0222] Table 13 shows the values ​​of TTL / Imgh, f12 / f, TTL / f, f1_2 / f3_7, FNO, (L72p1-L72p2) / L72c, Imgh / tan(HFOV) and ct1 / et1 in the optical imaging systems of the first to sixth embodiments.

[0223] Form 13

[0224] TTL / Imgh TTL / f f1_2 / f3_7 FNO First embodiment 2.51 1.12 -1.05 1.36 Second embodiment 2.51 1.13 -1.12 1.42 Third embodiment 2.51 1.13 -1.09 1.52 Fourth embodiment 2.51 1.13 -1.22 1.62 Fifth embodiment 2.47 1.11 -1.20 1.72 Sixth embodiment 2.48 1.12 -1.15 1.55 (L72p1-L72p2) / L72c Imgh / tan(HFOV)(mm) ct1 / et1 First embodiment 0.71 8.11 2.98 Second embodiment 1.81 8.01 2.32 Third embodiment 0.65 8.03 2.09 Fourth embodiment 0.86 8.03 1.83 Fifth embodiment 0.61 8.03 1.71 Sixth embodiment 0.65 8.02 2.01

[0225] See also Fig.14 The optical imaging system 10 of the embodiment of the present invention can be applied to the imaging module 100 of the embodiment of the present invention. The imaging module 100 includes a photosensitive element 20 and the optical imaging system 10 of any of the above embodiments. The photosensitive element 20 is arranged on the image side of the optical imaging system 10.

[0226] The photosensitive element 20 may be a complementary metal oxide semiconductor (CMOS) image sensor or a charge-coupled device (CCD).

[0227] The optical imaging system 10 in the above-mentioned imaging module 100 has a larger focal length while meeting the requirements of miniature design. The field of view is smaller than that of conventional optical imaging systems, which improves the relative brightness. Clear imaging effects can be achieved even in darker environments, and it can be used to shoot distant scenes. It improves the magnification and has functions such as blurring the background and highlighting the subject.

[0228] Please continue to see Fig.14 The imaging module 100 of the embodiment of the present invention can be applied to the electronic device 1000 of the embodiment of the present invention. The electronic device 1000 includes a housing 200 and the imaging module 100 , and the imaging module 100 is mounted on the housing 200 .

[0229] The electronic device 1000 of the embodiment of the present invention can be applied to vehicle-mounted, automatic driving and monitoring devices, wherein the electronic device 1000 includes but is not limited to driving recorders, smart phones, tablet computers, laptop computers, e-book readers, portable multimedia players (PMPs), portable phones, video phones, digital still cameras, mobile medical devices, wearable devices and other electronic devices that support imaging.

[0230] The optical imaging system 10 in the above-mentioned electronic device 1000 has a larger focal length while meeting the requirements of miniature design. The field of view is smaller than that of conventional optical imaging systems, and the relative brightness is improved. Clear imaging effects can be achieved even in darker environments, and it can be used to shoot distant scenes, improve the magnification, and has functions such as blurring the background and highlighting the subject.

[0231] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all variations that fall within the meaning and scope of the equivalent elements of the claims be included in the present invention.

[0232] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solution of the present invention can be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present invention.

Claims

1. An optical imaging system, characterized in that: The optical imaging system is composed of seven lenses with refractive power, which include, from the object side to the image side: A first lens having positive refractive power, wherein the object side surface of the first lens is convex at the near optical axis, and the image side surface of the first lens is concave at the near optical axis; a second lens having positive refractive power, wherein the object side surface of the second lens is convex at a position close to the optical axis; A third lens having negative refractive power, wherein the image side surface of the third lens is concave at the near optical axis; a fourth lens having a refracting power; A fifth lens having a refracting power; a sixth lens having a refractive power; and A seventh lens having negative refractive power; The optical imaging system satisfies the following conditional formula: 0.5<(L72p1-L72p2) / L72c; Wherein, L72c represents the maximum effective aperture of the central light beam in the direction perpendicular to the optical axis when the central light beam passes through the image side surface of the seventh lens, and the central light beam is the light beam incident on the center of the imaging surface of the optical imaging system; L72p1 represents the maximum vertical distance between the intersection of the edge light beam and the image side surface of the seventh lens and the optical axis, and L72p2 represents the minimum vertical distance between the intersection of the edge light beam and the image side surface of the seventh lens and the optical axis. The edge light beam is the light beam that is incident on the imaging surface of the optical imaging system and is farthest from the optical axis.

2. The optical imaging system according to claim 1, wherein: The first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are all aspherical.

3. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following conditional formula: 2.47≤TTL / Imgh<2.7; Wherein, TTL is the distance from the object side of the first lens to the image plane of the optical imaging system on the optical axis, and Imgh is the image height corresponding to half of the maximum field of view of the optical imaging system.

4. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following conditional formula: TTL / f<1.2; Wherein, TTL is the distance from the object side surface of the first lens to the image plane of the optical imaging system on the optical axis, and f is the effective focal length of the optical imaging system.

5. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following conditional formula: -1.22≤f1_2 / f3_7≤-1.05; Wherein, f1_2 is the combined focal length of the first lens to the second lens; f3_7 is the combined focal length of the third lens to the seventh lens.

6. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following conditional formula: 1.36≤FNO<1.9; Wherein, FNO is the aperture number of the optical imaging system.

7. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following conditional formula: Imgh / tan(HFOV)>6mm; Among them, Imgh is the image height corresponding to half of the maximum field of view of the optical imaging system, and HFOV is half of the maximum field of view of the optical imaging system.

8. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following conditional formula: ct1 / et1<3.5; Wherein, ct1 is the thickness of the first lens on the optical axis, and et1 is the edge thickness of the first lens in the direction of the optical axis.

9. An imaging module, characterized in that: include: The optical imaging system according to any one of claims 1 to 8; and A photosensitive element is arranged on the image side of the optical imaging system.

10. An electronic device, characterized in that: include: case; and The imaging module as described in claim 9 is mounted on the housing.

Images