Optical imaging system, imaging module and electronic device

Abstract

The present application 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 having positive refractive power, the object side surface of the first lens being convex at the near optical axis; a second lens having refractive power; a third lens having refractive power; a fourth lens having refractive power; and a fifth lens having refractive power, the object side surface of the fifth lens being concave at the near circumference; the optical imaging system satisfies the following conditional formula: 43*f / (2*ImgH)>147; wherein f is the effective focal length of the optical imaging system, and ImgH is half of the image height corresponding to the maximum field of view of the optical imaging system. The above optical imaging system increases the focal length of the optical imaging system while satisfying the miniature design, and can be used for long-range shooting; at the same time, the optical imaging system can obtain an equivalent focal length of about 150mm by satisfying the above conditional formula, thereby having a long-focus telephoto characteristic.

Description

Technical Field

[0001] The present application 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, computers, etc. in life, various electronic products are constantly being innovated. Among them, the improvement and innovation of the shooting effect of periscope cameras in electronic products has become one of the focuses of people's attention, and it has also become an important part of technological improvement.

[0003] In the process of realizing the present application, the inventors found that there are at least the following problems in the prior art: it is difficult for existing periscope optical imaging systems to achieve high-definition imaging while maintaining the long focal length of the optical imaging system. 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 has positive refractive power, and the object side surface of the first lens is convex at the near optical axis;

[0007] The second lens has refractive power;

[0008] The third lens has refractive power;

[0009] a fourth lens element having refractive power; and

[0010] a fifth lens having refractive power, wherein the object side surface of the fifth lens is concave near the circumference;

[0011] The optical imaging system satisfies the following conditional formula:

[0012] 43*f / (2*ImgH)>147;

[0013] Wherein, f is the effective focal length of the optical imaging system, and ImgH is half of the image height corresponding to the maximum field of view angle of the optical imaging system.

[0014] The above optical imaging system reasonably configures the refractive power and surface shape of each lens so that the system meets the requirements of miniature design while increasing the focal length of the optical imaging system, which can be used for long-range shooting, improve the magnification, and achieve higher pixels and good image quality. At the same time, the optical imaging system can obtain an equivalent focal length of about 150mm by meeting the above conditions, thereby having a long-focus telephoto characteristic.

[0015] In some embodiments, the optical imaging system satisfies the following condition:

[0016] TTL / ImgH<6.7;

[0017] Wherein, TTL is the distance from the object side of the first lens to the imaging surface of the optical imaging system on the optical axis.

[0018] In this way, by satisfying the above conditional formula, the optical imaging system can support high-pixel photosensitive elements, that is, ImgH determines the size of the photosensitive element. The larger the ImgH, the larger the size of the photosensitive element that can be supported; the reduction of TTL can compress the length of the entire optical imaging system, making it easy for the optical imaging system to be ultra-thin and miniaturized. When the ratio of TTL / ImgH is greater than 6.7, the length of the optical imaging system is long, and it is difficult to ensure the ultra-thinness and miniaturization of the optical imaging system; in addition, the value of ImgH may be too small, which is not conducive to supporting large-sized photosensitive elements.

[0019] In some embodiments, the optical imaging system satisfies the following condition:

[0020] TTL / f≤0.96;

[0021] Wherein, TTL is the distance from the object side of the first lens to the imaging surface of the optical imaging system on the optical axis.

[0022] In this way, the optical imaging system satisfies the above conditional expression, making TTL positively correlated with f, and the optical imaging system can be miniaturized while obtaining the long-focus telephoto characteristic. When the ratio of TTL / f is greater than 0.96, the optical imaging system is too long while having the long-focus telephoto characteristic, which is not conducive to miniaturization of the optical imaging system.

[0023] In some embodiments, the optical imaging system satisfies the following condition:

[0024] 3≤|f / f4|≤6;

[0025] Wherein, f4 is the focal length of the fourth lens.

[0026] In this way, the optical imaging system satisfies the above conditional formula, so that the fourth lens provides a part of the positive refractive power or negative refractive power for the optical imaging system, which can be used to adjust the overall refractive power of the optical imaging system. The fourth lens forms a Gaussian structure with the first lens, the second lens and the third lens, which can balance the distortion generated by the first lens, the second lens and the third lens, and avoid high-order aberrations caused by excessive refractive index, thereby improving the imaging quality of the optical imaging system. When the ratio of |f / f4| is less than 3, the effective focal length of the optical imaging system is too small, which is not conducive to meeting the long-focus telephoto characteristic. When the ratio of |f / f4| is greater than 6, the focal length of the fourth lens is too large, and it is difficult for the fourth lens to balance the distortion generated by the first lens, the second lens and the third lens. The refractive index of the optical imaging system is too large, which is easy to cause high-order aberrations.

[0027] In some embodiments, the optical imaging system satisfies the following condition:

[0028] |f2 / R22|<142;

[0029] Wherein, f2 is the focal length of the second lens, and R22 is the radius of curvature of the image side surface of the second lens at the optical axis.

[0030] In this way, by satisfying the above conditional formula, the optical imaging system can reasonably configure the surface shape and focal length of the second lens, which can effectively improve the aberration caused by the light passing through the first lens, and enhance the imaging resolution of the optical imaging system. When the ratio of |f2 / R22| is greater than 142, the focal length of the second lens is too large, or the radius of curvature of the image side surface of the second lens at the optical axis is too small. In the above cases, it is difficult to ensure that the aberration caused by the light passing through the first lens can be effectively improved, thereby affecting the imaging resolution of the optical imaging system.

[0031] In some embodiments, the optical imaging system satisfies the following condition:

[0032] 11mm <FNO*ImgH<13mm;

[0033] Wherein, FNO is the aperture number of the optical imaging system.

[0034] In this way, by satisfying the above conditional formula, the optical imaging system can reasonably set the aperture number and the size of the imaging surface, and can obtain a relatively smooth light trend under the system parameters of ultra-long focal length, and can keep the incident pupil of the optical imaging system consistent with the aperture size of the imaging surface, satisfying the basic characteristic of the periscope lens that the apertures of the lenses are close. When the value of FNO*ImgH is less than 11mm, the value of ImgH is too small, which is not conducive to the optical imaging system supporting large-size photosensitive elements and high-pixel imaging. When the value of FNO*ImgH is greater than 13mm, the aperture number of FNO is too large, making it difficult to keep the incident pupil of the optical imaging system consistent with the aperture size of the imaging surface, and thus it is difficult to ensure that the optical imaging system meets the basic characteristic of the apertures of the lenses being close.

[0035] In some embodiments, the optical imaging system satisfies the following condition:

[0036] 2.12≤ΣCT / ΣAT≤4.16;

[0037] Wherein, ΣCT is the sum of the thicknesses of the lenses of the optical imaging system on the optical axis, and ΣAT is the sum of the air intervals between adjacent lenses of the optical imaging system on the optical axis.

[0038] In this way, by satisfying the above conditional formula, the optical imaging system can reasonably set the proportion of ΣCT and ΣAT in the optical imaging system, which is beneficial to improving the imaging quality of the optical imaging system and can make the light smoothly transition on each lens surface during the transmission process. When the ratio of ΣCT / ΣAT is greater than 4.16, the thickness of the lens is too large, which is not conducive to the convergence and diffusion of light between the lenses, forcing the lens to change the light trend in a more curved posture, increasing the manufacturing difficulty of each lens; when the ratio of ΣCT / ΣAT is less than 2.12, the thickness of the lens is too low, and the trend of light cannot be effectively controlled, thereby reducing the imaging quality of the optical imaging system.

[0039] In some embodiments, the optical imaging system satisfies the following condition:

[0040] BF / TTL>0.6;

[0041] Wherein, BF is the minimum distance from the image side surface of the fifth lens to the imaging surface of the optical imaging system in a direction parallel to the optical axis, and TTL is the distance from the object side surface of the first lens to the imaging surface of the optical imaging system on the optical axis.

[0042] In this way, by satisfying the above conditional formula, the optical imaging system can make the back focus of the optical imaging system more reasonable, which is conducive to the assembly of the optical imaging system in the imaging module. When the ratio of BF / TTL is less than 0.6, the back focus of the optical imaging system is too small, resulting in insufficient space for installing the optical imaging system, which is not conducive to the assembly of the optical imaging system in the imaging module.

[0043] In some embodiments, the optical imaging system further comprises:

[0044] The optical path deflecting element is arranged on the object side of the first lens and is used to change the propagation direction of the light.

[0045] In this way, the optical imaging system changes the propagation direction of light through the optical path deflection element, and the optical imaging system can be applied to a periscope camera lens.

[0046] An embodiment of the present application further provides an imaging module, including:

[0047] An optical imaging system as described above; and

[0048] A photosensitive element is arranged on the image side of the optical imaging system.

[0049] The above-mentioned imaging module includes an optical imaging system. The optical imaging system reasonably configures the refractive power and surface shape of each lens so that the system meets the requirements of miniature design while increasing the focal length of the optical imaging system. It can be used for long-range shooting, improve the magnification, and achieve higher pixels and good image quality. At the same time, the optical imaging system can obtain an equivalent focal length of about 150mm by satisfying the above-mentioned conditional formula, thereby having a long-focus telephoto characteristic.

[0050] An embodiment of the present application further provides an electronic device, including:

[0051] housing; and

[0052] As described above, the imaging module is arranged on the housing.

[0053] The above-mentioned electronic device includes an imaging module, which includes an optical imaging system. The optical imaging system reasonably configures the refractive power and surface shape of each lens so that the system meets the requirements of miniature design while increasing the focal length of the optical imaging system. It can be used for long-range shooting, improve the magnification, and achieve higher pixels and good image quality. At the same time, the optical imaging system can obtain an equivalent focal length of about 150mm by satisfying the above-mentioned conditional formula, thereby having a long-focus telephoto characteristic. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 It is a schematic diagram of the structure of the optical imaging system provided in the first embodiment of the present application.

[0055] Figure 2 It is a schematic diagram of spherical aberration, astigmatism and distortion of the optical imaging system in the first embodiment of the present application.

[0056] Figure 3 It is a schematic diagram of the structure of the optical imaging system provided in the second embodiment of the present application.

[0057] Figure 4 It is a schematic diagram of spherical aberration, astigmatism and distortion of the optical imaging system in the second embodiment of the present application.

[0058] Figure 5 It is a schematic diagram of the structure of the optical imaging system provided in the third embodiment of the present application.

[0059] Figure 6 It is a schematic diagram of spherical aberration, astigmatism and distortion of the optical imaging system in the third embodiment of the present application.

[0060] Figure 7 It is a schematic diagram of the structure of the optical imaging system provided in the fourth embodiment of the present application.

[0061] Figure 8 It is a schematic diagram of spherical aberration, astigmatism and distortion of the optical imaging system in the fourth embodiment of the present application.

[0062] Fig. 9 It is a schematic diagram of the structure of the optical imaging system provided in the fifth embodiment of the present application.

[0063] Fig.10 It is a schematic diagram of spherical aberration, astigmatism and distortion of the optical imaging system in the fifth embodiment of the present application.

[0064] Fig.11 It is a structural schematic diagram of the imaging module provided in the sixth embodiment of the present application.

[0065] Fig.12 It is a schematic diagram of the structure of an electronic device provided in the seventh embodiment of the present application.

[0066] Main component symbols

[0067] Electronic device 1000

[0068] Image acquisition module 100

[0069] Optical imaging system 10

[0070] First lens L1

[0071] Second lens L2

[0072] The third lens L3

[0073] The fourth lens L4

[0074] Fifth lens L5

[0075] Filter L6

[0076] Aperture STO

[0077] Object side S1, S3, S5, S7, S9, S11

[0078] Like side S2, S4, S6, S8, S10, S12

[0079] Imaging surface S13

[0080] Photosensitive element 20

[0081] Optical path deflection element 30

[0082] Housing 200 DETAILED DESCRIPTION

[0083] The embodiments of the present application are described in detail below, and examples of the embodiments 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 application, and cannot be understood as limiting the present application.

[0084] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0085] In addition, 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 technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is three or more, unless otherwise clearly and specifically defined.

[0086] The disclosure below provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described below. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the various specific processes and material examples provided by the present application, but those of ordinary skill in the art can appreciate the application of other processes and / or the use of other materials.

[0087] See also Figure 1 The first embodiment of the present application proposes an optical imaging system 10, which includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4 and a fifth lens L5 from the object side to the image side.

[0088] The first lens L1 has positive refractive power. 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 near the optical axis ( Figure 1 The second lens L2 has refractive power, and has an object-side surface S3 and an image-side surface S4; the third lens L3 has refractive power, and has an object-side surface S5 and an image-side surface S6; the fourth lens L4 has refractive power, and has an object-side surface S7 and an image-side surface S8; the fifth lens L5 has refractive power, and has an object-side surface S9 and an image-side surface S10, and the object-side surface S9 of the fifth lens L5 is concave near the circumference.

[0089] The optical imaging system 10 satisfies the following conditional formula:

[0090] 43*f / (2*ImgH)>147;

[0091] Wherein, f is the effective focal length of the optical imaging system 10 , and ImgH is half of the image height corresponding to the maximum field angle of the optical imaging system 10 .

[0092] The optical imaging system 10 can obtain an equivalent focal length of about 150 mm by reasonably controlling the value of 43*f / (2*ImgH), thereby having a long-focus telephoto characteristic, being suitable for long-range photography, and supporting high-pixel photography. When the value of 43*f / (2*ImgH) is less than 147, the equivalent focal length of the optical imaging system is less than 147 mm, and it cannot be guaranteed that the optical imaging system can meet the long-focus telephoto characteristic.

[0093] In the optical imaging system 10 of this embodiment, by reasonably configuring the refractive power and surface shape of each lens, the system increases the focal length of the optical imaging system 10 while meeting the requirements of miniature design, can be used for long-range shooting, can improve the magnification, and achieve higher pixels and good image quality.

[0094] In this embodiment, the object side of the optical imaging system 10 further has an optical path deflecting element 30, and the image side of the optical imaging system 10 further has an imaging surface S13. The optical path deflecting element 30 can change the propagation direction of light, and is used to reduce the space occupied by the optical imaging system 10 when it is installed in the imaging module, and can also enable the optical imaging system 10 to be used in a periscope lens. The optical path deflecting element 30 can be a prism; the imaging surface S13 can be the receiving surface of the photosensitive element 20.

[0095] It can be understood that in other embodiments, the light path deflecting element 30 can also be a reflector, a pentaprism, a heptagonal prism or other elements that have the function of changing the propagation direction of light.

[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 S10 of the fifth lens L5. Figure 1 , 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 a filter L6, and the filter L6 has an object side surface S11 and an image side surface S12. The filter L6 is disposed on the image side of the fifth lens L5 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] It can be understood that in other embodiments, the filter 16 in the optical imaging system 10 can also be used to filter out invisible light such as infrared light, and only allow visible light to pass through to adapt to the human eye's vision, so that the optical imaging system 10 can have higher pixels and good imaging quality when used in the daytime with sufficient light.

[0099] In some embodiments, the optical imaging system 10 satisfies the following conditional formula:

[0100] TTL / ImgH<6.7;

[0101] Wherein, TTL is the distance on the optical axis from the object-side surface S1 of the first lens L1 to the imaging surface S13 of the optical imaging system 10 .

[0102] By properly controlling the ratio of TTL / ImgH, the optical imaging system 10 can support high-pixel photosensitive elements, that is, ImgH determines the size of the photosensitive element. The larger the ImgH, the larger the size of the photosensitive element 20 that can be supported. When TTL is reduced, the length of the entire optical imaging system 10 can be compressed, making it easy for the optical imaging system 10 to be ultra-thin and miniaturized. When the ratio of TTL / ImgH is greater than 6.7, the length of the optical imaging system 10 is long, and it is difficult to ensure the ultra-thinness and miniaturization of the optical imaging system 10. In addition, the value of ImgH may be too small, which is not conducive to supporting large-sized photosensitive elements 20.

[0103] In some embodiments, the optical imaging system 10 satisfies the following conditional formula:

[0104] TTL / f≤0.96.

[0105] TTL is positively correlated with f. By controlling the ratio of TTL / f within a reasonable range, the optical imaging system 10 can be miniaturized while obtaining a long-focus telephoto characteristic. When the ratio of TTL / f is greater than 0.96, the total optical length of the optical imaging system 10 is too large while having a long-focus telephoto characteristic, which is not conducive to miniaturization of the optical imaging system 10.

[0106] In some embodiments, the optical imaging system 10 satisfies the following conditional formula:

[0107] 3≤|f / f4|≤6;

[0108] Wherein, f4 is the focal length of the fourth lens L4.

[0109] By reasonably controlling the ratio of |f / f4|, the fourth lens L4 provides a portion of positive or negative refractive power for the optical imaging system 10, which can be used to adjust the overall refractive power of the optical imaging system 10. The fourth lens L4 forms a Gaussian structure with the first lens L1, the second lens L2 and the third lens L3, which can balance the distortion generated by the first lens L1, the second lens L2 and the third lens L3, and avoid high-order aberrations caused by excessive refractive index, thereby improving the imaging quality of the optical imaging system. When the ratio of |f / f4| is less than 3, the effective focal length of the optical imaging system 10 is too small, which is not conducive to meeting the long-focus telephoto characteristic. When the ratio of |f / f4| is greater than 6, the focal length of the fourth lens L4 is too large, and it is difficult to balance the distortion generated by the first lens L1, the second lens L2 and the third lens L3. The refractive index of the optical imaging system 10 is too large, which is easy to cause high-order aberrations.

[0110] In some embodiments, the optical imaging system 10 satisfies the following conditional formula:

[0111] |f2 / R22|<142;

[0112] Wherein, f2 is the focal length of the second lens L2, and R22 is the radius of curvature of the image side surface S4 of the second lens L2 at the optical axis.

[0113] By properly controlling the ratio of |f2 / R22|, the aberrations generated by the light passing through the first lens L1 can be effectively improved, thereby improving the imaging resolution of the optical imaging system 10. When the ratio of |f2 / R22| is greater than 142, the focal length of the second lens L2 is too large, or the radius of curvature of the image side surface S4 of the second lens L2 at the optical axis is too small. In both cases, it is difficult to ensure that the aberrations generated by the light passing through the first lens L1 can be effectively improved, thereby affecting the imaging resolution of the optical imaging system 10.

[0114] In some embodiments, the optical imaging system 10 satisfies the following conditional formula:

[0115] 11mm <FNO*ImgH<13mm;

[0116] Wherein, FNO is the aperture number of the optical imaging system 10 .

[0117] By reasonably controlling the value of FNO*ImgH, a relatively gentle light trend can be obtained under the system parameters of ultra-long focal length, and the incident pupil of the optical imaging system 10 can be kept consistent with the aperture size of the imaging surface S13, satisfying the basic characteristic of the periscope lens having close apertures. When the value of FNO*ImgH is less than 11mm, the value of ImgH is too small, which is not conducive to the optical imaging system 10 supporting a large-sized photosensitive element 20, and is not conducive to imaging. When the value of FNO*ImgH is greater than 13mm, the aperture number of FNO is too large, making it difficult to keep the incident pupil of the optical imaging system 10 consistent with the aperture size of the imaging surface S13, thereby making it difficult to ensure that the optical imaging system 10 satisfies the basic characteristic of having close apertures of the lenses.

[0118] In some embodiments, the optical imaging system 10 satisfies the following conditional formula:

[0119] 2.12≤ΣCT / ΣAT≤4.16;

[0120] Wherein, ΣCT is the sum of the thicknesses of the lenses of the optical imaging system 10 on the optical axis, and ΣAT is the sum of the air intervals between adjacent lenses of the optical imaging system 10 on the optical axis.

[0121] By properly controlling the ratio of ΣCT / ΣAT, it is beneficial to improve the imaging quality of the optical imaging system 10, and it is possible to make the light smoothly transition on each lens surface during the transmission process. When the ratio of ΣCT / ΣAT is greater than 4.16, the thickness of the lens is too large, which is not conducive to the convergence and diffusion of light between the lenses, forcing the lens to change the light trend in a more curved posture, increasing the manufacturing difficulty of each lens; when the ratio of ΣCT / ΣAT is less than 2.12, the thickness of the lens is too low, and the light trend cannot be effectively controlled, thereby reducing the imaging quality of the optical imaging system 10.

[0122] In some embodiments, the optical imaging system 10 satisfies the following conditional formula:

[0123] BF / TTL>0.6, preferably 0.6 <BF / TTL<0.8;

[0124] Wherein, BF is the minimum distance between the image-side surface S10 of the fifth lens L5 and the imaging surface S13 of the optical imaging system in a direction parallel to the optical axis, and TTL is the distance between the object-side surface S1 of the first lens L1 and the imaging surface S13 of the optical imaging system on the optical axis.

[0125] By properly controlling the ratio of BF / TTL, the back focus of the optical imaging system 10 can be made more reasonable, which is beneficial to the assembly of the optical imaging system 10 in the imaging module. When the ratio of BF / TTL is less than 0.6, the back focus of the optical imaging system 10 is too small, resulting in insufficient space for installing the optical imaging system 10, which is not conducive to the assembly of the optical imaging system 10 in the imaging module.

[0126] First embodiment

[0127] See also Figure 1 In the optical imaging system 10 of this embodiment, from the object side to the image side, it includes an optical path refraction element 30, an aperture STO, a first lens L1 with positive refractive power, a second lens L2 with negative refractive power, a third lens L3 with positive refractive power, a fourth lens L4 with negative refractive power, a fifth lens L5 with negative refractive power and a filter L6.

[0128] The materials of the first lens L1 , the second lens L2 , the third lens L3 , the fourth lens L4 and the fifth lens L5 are all made of plastic, and the material of the filter L6 is glass.

[0129] It can be understood that in other embodiments, the material of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 can all be glass, or one or more of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 can be glass, and the rest can be plastic.

[0130] 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 convex at the near optical axis, the object-side surface S3 of the second lens L2 is concave 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 convex at the near optical axis, the object-side surface S7 of the fourth lens L4 is concave at the near optical axis, the image-side surface S8 of the fourth lens L4 is convex at the near optical axis, the object-side surface S9 of the fifth lens L5 is concave at the near optical axis, and the object-side surface S10 of the fifth lens L5 is convex at the near optical axis.

[0131] The object-side surface S1 of the first lens L1 is convex at the near circumference, the image-side surface S2 of the first lens L1 is convex at the near circumference, the object-side surface S3 of the second lens L2 is convex at the near circumference, the image-side surface S4 of the second lens L2 is concave at the near circumference, the object-side surface S5 of the third lens L3 is convex at the near circumference, the image-side surface S6 of the third lens L3 is convex at the near circumference, the object-side surface S7 of the fourth lens L4 is concave at the near circumference, the image-side surface S8 of the fourth lens L4 is concave at the near circumference, the object-side surface S9 of the fifth lens L5 is concave at the near circumference, and the image-side surface S10 of the fifth lens L5 is convex at the near circumference.

[0132] When the optical imaging system 10 is used for imaging, the light emitted or reflected by the subject enters the optical imaging system 10 from the object side, and passes through the optical path refraction element 30, the aperture STO, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the filter L6 in sequence, and finally converges on the imaging surface S13.

[0133] Table 1 shows the characteristics of the optical imaging system 10 of this embodiment, wherein the reference wavelength of the focal length, refractive index and Abbe number is 587.5618 nm, and the units of the Y radius, thickness and focal length are all millimeters (mm).

[0134] Table 1

[0135]

[0136]

[0137] 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 imaging surface S13 of the optical imaging system 10 on the optical axis.

[0138] In this embodiment, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4 and the fifth lens L5 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:

[0139]

[0140] Wherein, Z is the distance between any point on the aspheric surface and the vertex of the surface parallel to the optical axis, r is the perpendicular 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 shows the high-order coefficients K, A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each spherical lens S1-S10 in the first embodiment.

[0141] Table 2

[0142]

[0143]

[0144] Figure 2 The longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical imaging system 10 of the first embodiment are shown, wherein the longitudinal spherical aberration curve indicates that after light rays with wavelengths of 656.2725nm, 587.5618nm and 486.1327nm pass through the lenses of the optical imaging system 10, the deviation of the focus point is less than 0.025mm, indicating that the imaging quality of this embodiment is good; the reference wavelength of astigmatism and distortion is 587.5618nm, the astigmatism curve indicates the meridional image curvature and the sagittal image curvature, wherein the maximum values ​​of the sagittal field curvature and the meridional field curvature are both less than 0.025mm, indicating that the astigmatism and field curvature are well compensated; the distortion curve indicates the distortion magnitude values ​​corresponding to different field of view angles, wherein the maximum distortion is less than 50%, indicating that the distortion is also well corrected. According to Figure 2 It can be seen that the optical imaging system 10 provided in the first embodiment can achieve good imaging quality.

[0145] Second embodiment

[0146] See also Figure 3 In the optical imaging system 10 of this embodiment, from the object side to the image side, it includes an optical path refraction element 30, an aperture STO, a first lens L1 with positive refractive power, a second lens L2 with negative refractive power, a third lens L3 with positive refractive power, a fourth lens L4 with negative refractive power, a fifth lens L5 with positive refractive power and a filter L6.

[0147] 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 convex at the near optical axis, the object side surface S3 of the second lens L2 is concave 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 convex at the near optical axis, the object side surface S7 of the fourth lens L4 is concave at the near optical axis, the image side surface S8 of the fourth 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, and the object side surface S10 of the fifth lens L5 is concave at the near optical axis.

[0148] The object-side surface S1 of the first lens L1 is convex at the near circumference, the image-side surface S2 of the first lens L1 is convex at the near circumference, the object-side surface S3 of the second lens L2 is concave at the near circumference, the image-side surface S4 of the second lens L2 is concave at the near circumference, the object-side surface S5 of the third lens L3 is convex at the near circumference, the image-side surface S6 of the third lens L3 is convex at the near circumference, the object-side surface S7 of the fourth lens L4 is concave at the near circumference, the image-side surface S8 of the fourth lens L4 is convex at the near circumference, the object-side surface S9 of the fifth lens L5 is concave at the near circumference, and the image-side surface S10 of the fifth lens L5 is concave at the near circumference.

[0149] When the optical imaging system 10 is used for imaging, the light emitted or reflected by the subject enters the optical imaging system 10 from the object side, and passes through the optical path refraction element 30, the aperture STO, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the filter L6 in sequence, and finally converges on the imaging surface S13.

[0150] Table 3 shows the characteristics of the optical imaging system 10 of this embodiment, wherein the reference wavelength of the focal length, refractive index and Abbe number is 587.5618 nm, and the units of the Y radius, thickness and focal length are all millimeters (mm).

[0151] Table 3

[0152]

[0153]

[0154] Table 4 shows the higher-order coefficients K, A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each spherical lens S1-S10 in the second embodiment.

[0155] Table 4

[0156]

[0157] Figure 4The longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical imaging system 10 of the second embodiment are shown, wherein the longitudinal spherical aberration curve indicates that after light rays with wavelengths of 656.2725nm, 587.5618nm and 486.1327nm pass through the lenses of the optical imaging system 10, the deviation of the focus point is less than 0.05mm, indicating that the imaging quality of this embodiment is good; the reference wavelength of astigmatism and distortion is 587.5618nm, the astigmatism curve indicates the meridional image curvature and sagittal image curvature, wherein the maximum values ​​of the sagittal field curvature and the meridional field curvature are both less than 0.025mm, indicating that the astigmatism and field curvature are well compensated; the distortion curve indicates the distortion magnitude values ​​corresponding to different field of view angles, wherein the maximum distortion is less than 50%, indicating that the distortion is also well corrected. According to Figure 4 It can be seen that the optical imaging system 10 provided in the second embodiment can achieve good imaging quality.

[0158] Third embodiment

[0159] See also Figure 5 In the optical imaging system 10 of this embodiment, from the object side to the image side, it includes an optical path refraction element 30, an aperture STO, a first lens L1 with positive refractive power, a second lens L2 with negative 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 and a filter L6.

[0160] 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 convex at the near optical axis, the object side surface S3 of the second lens L2 is concave 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, the image side surface S8 of the fourth 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, and the object side surface S10 of the fifth lens L5 is concave at the near optical axis.

[0161] The object-side surface S1 of the first lens L1 is convex at the near circumference, the image-side surface S2 of the first lens L1 is convex at the near circumference, the object-side surface S3 of the second lens L2 is concave at the near circumference, the image-side surface S4 of the second lens L2 is concave at the near circumference, the object-side surface S5 of the third lens L3 is convex at the near circumference, the image-side surface S6 of the third lens L3 is concave at the near circumference, the object-side surface S7 of the fourth lens L4 is convex at the near circumference, the image-side surface S8 of the fourth lens L4 is concave at the near circumference, the object-side surface S9 of the fifth lens L5 is concave at the near circumference, and the image-side surface S10 of the fifth lens L5 is convex at the near circumference.

[0162] When the optical imaging system 10 is used for imaging, the light emitted or reflected by the subject enters the optical imaging system from the object side, and passes through the optical path refraction element 30, the aperture STO, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the filter L6 in sequence, and finally converges on the imaging surface S13.

[0163] Table 5 shows the characteristics of the optical imaging system 10 of this embodiment, wherein the reference wavelength of the focal length, refractive index and Abbe number is 587.5618 nm, and the units of the Y radius, thickness and focal length are all millimeters (mm).

[0164] Table 5

[0165]

[0166]

[0167] Table 6 shows the higher-order coefficients K, A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each spherical lens S1-S10 in the third embodiment.

[0168] Table 6

[0169]

[0170] Figure 6 The longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical imaging system 10 of the third embodiment are shown, wherein the longitudinal spherical aberration curve indicates that after light rays with wavelengths of 656.2725nm, 587.5618nm and 486.1327nm pass through the lenses of the optical imaging system 10, the deviation of the focus point is less than 0.025mm, indicating that the imaging quality of this embodiment is good; the reference wavelength of astigmatism and distortion is 587.5618nm, the astigmatism curve indicates the meridional image curvature and sagittal image curvature, wherein the maximum values ​​of the sagittal field curvature and the meridional field curvature are both less than 0.025mm, indicating that the astigmatism and field curvature are well compensated; the distortion curve indicates the distortion magnitude values ​​corresponding to different field angles, wherein the maximum distortion is less than 50%, indicating that the distortion is also well corrected. According to Figure 6 It can be seen that the optical imaging system 10 provided in the third embodiment can achieve good imaging quality.

[0171] Fourth embodiment

[0172] See also Figure 7In the optical imaging system 10 of this embodiment, from the object side to the image side, it includes an optical path refraction element 30, 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 and a filter L6.

[0173] 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, the image side surface S8 of the fourth 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, and the object side surface S10 of the fifth lens L5 is concave at the near optical axis.

[0174] The object-side surface S1 of the first lens L1 is convex at the near circumference, the image-side surface S2 of the first lens L1 is concave at the near circumference, the object-side surface S3 of the second lens L2 is convex at the near circumference, the image-side surface S4 of the second lens L2 is convex at the near circumference, the object-side surface S5 of the third lens L3 is concave at the near circumference, the image-side surface S6 of the third lens L3 is concave at the near circumference, the object-side surface S7 of the fourth lens L4 is convex at the near circumference, the image-side surface S8 of the fourth lens L4 is concave at the near circumference, the object-side surface S9 of the fifth lens L5 is concave at the near circumference, and the image-side surface S10 of the fifth lens L5 is concave at the near circumference.

[0175] When the optical imaging system 10 is used for imaging, the light emitted or reflected by the subject enters the optical imaging system 10 from the object side, and passes through the optical path refraction element 30, the aperture STO, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the filter L6 in sequence, and finally converges on the imaging surface S13.

[0176] Table 7 shows a table of characteristics of the optical imaging system 10 of this embodiment, wherein the reference wavelength of the focal length, refractive index and Abbe number is 587.5618 nm, and the units of the Y radius, thickness and focal length are all millimeters (mm).

[0177] Table 7

[0178]

[0179] Table 8 shows the higher-order coefficients K, A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each spherical lens S1-S10 in the fourth embodiment.

[0180] Table 8

[0181]

[0182]

[0183] Figure 8 The longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical imaging system 10 of the fourth embodiment are shown, wherein the longitudinal spherical aberration curve indicates that after light rays with wavelengths of 656.2725nm, 587.5618nm and 486.1327nm pass through the lenses of the optical imaging system 10, the deviation of the focus point is less than 0.025mm, indicating that the imaging quality of this embodiment is good; the reference wavelength of astigmatism and distortion is 587.5618nm, the astigmatism curve indicates the meridional image curvature and the sagittal image curvature, wherein the maximum values ​​of the sagittal field curvature and the meridional field curvature are both less than 0.025mm, indicating that the astigmatism and field curvature are well compensated; the distortion curve indicates the distortion magnitude values ​​corresponding to different field angles, wherein the maximum distortion is less than 50%, indicating that the distortion is also well corrected. According to Figure 8 It can be seen that the optical imaging system 10 provided in the fourth embodiment can achieve good imaging quality.

[0184] Fifth embodiment

[0185] See also Fig. 9 In the optical imaging system 10 of this embodiment, from the object side to the image side, it includes an optical path refraction element 30, 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 and a filter L6.

[0186] 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, the image side surface S8 of the fourth 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, and the object side surface S10 of the fifth lens L5 is concave at the near optical axis.

[0187] The object-side surface S1 of the first lens L1 is convex at the near circumference, the image-side surface S2 of the first lens L1 is concave at the near circumference, the object-side surface S3 of the second lens L2 is convex at the near circumference, the image-side surface S4 of the second lens L2 is convex at the near circumference, the object-side surface S5 of the third lens L3 is concave at the near circumference, the image-side surface S6 of the third lens L3 is concave at the near circumference, the object-side surface S7 of the fourth lens L4 is convex at the near circumference, the image-side surface S8 of the fourth lens L4 is concave at the near circumference, the object-side surface S9 of the fifth lens L5 is concave at the near circumference, and the image-side surface S10 of the fifth lens L5 is concave at the near circumference.

[0188] When the optical imaging system 10 is used for imaging, the light emitted or reflected by the subject enters the optical imaging system 10 from the object side, and passes through the optical path refraction element 30, the aperture STO, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the filter L6 in sequence, and finally converges on the imaging surface S13.

[0189] Table 9 shows a table of characteristics of the optical imaging system 10 of this embodiment, wherein the reference wavelength of the focal length, refractive index and Abbe number is 587.5618 nm, and the units of the Y radius, thickness and focal length are all millimeters (mm).

[0190] Form 9

[0191]

[0192] Table 10 shows the higher-order coefficients K, A4, A6, A8, A10, A12, A14, A16, A18 and A20 that can be used for each of the spherical lenses S1 to S10 in the fifth embodiment.

[0193] Table 10

[0194]

[0195]

[0196] Fig.10The longitudinal spherical aberration curve, astigmatism curve and distortion curve of the optical imaging system 10 of the fifth embodiment are shown, wherein the longitudinal spherical aberration curve indicates that after light rays with wavelengths of 656.2725nm, 587.5618nm and 486.1327nm pass through the lenses of the optical imaging system 10, the deviation of the focus point is less than 0.025mm, indicating that the imaging quality of this embodiment is good; the reference wavelength of astigmatism and distortion is 587.5618nm, the astigmatism curve indicates the meridional image curvature and the sagittal image curvature, wherein the maximum values ​​of the sagittal field curvature and the meridional field curvature are both less than 0.025mm, indicating that the astigmatism and field curvature are well compensated; the distortion curve indicates the distortion magnitude values ​​corresponding to different field angles, wherein the maximum distortion is less than 50%, indicating that the distortion is also well corrected. According to Fig.10 It can be seen that the optical imaging system 10 provided in the fifth embodiment can achieve good imaging quality.

[0197] Table 11 shows the values ​​of 43*f / (2*ImgH), TTL / ImgH, TTL / f, |f / f4|, |f2 / R21|, FNO*ImgH(mm), ΣCT / ΣAT and BF / TTL in the optical imaging system 10 of the first to fifth embodiments.

[0198] Table 11

[0199] Example First embodiment Second embodiment Third embodiment Fourth embodiment Fifth embodiment 43*f / (2*ImgH) 148.12 148.71 147.53 148.12 152.86 TTL / ImgH 6.56 6.50 6.50 6.61 6.61 TTL / f 0.95 0.94 0.95 0.96 0.93 |f / f4| 3.45 3.65 3.66 4.84 5.27 |f2 / R21| 6.73 25.20 8.44 141.40 5.44 FNO*ImgH(mm) 12.52 12.34 12.34 12.34 12.16 ΣCT / ΣAT 4.16 2.93 3.63 2.40 2.12 BF / TTL 0.62 0.63 0.63 0.71 0.64

[0200] See also Fig.11 The sixth embodiment of the present application provides an imaging module 100 , including an optical imaging system 10 and a photosensitive element 20 , wherein the photosensitive element 20 is disposed on the image side of the optical imaging system 10 .

[0201] Specifically, the photosensitive element 20 may be a complementary metal oxide semiconductor (CMOS) image sensor or a charge-coupled device (CCD).

[0202] The optical imaging system 10 in the imaging module 100 of the present embodiment reasonably configures the lenses so that the system can meet the requirements of miniature design while increasing the focal length of the optical imaging system 10, which can be used for long-range shooting, improve the magnification, and achieve higher pixels and good image quality. At the same time, the optical imaging system 10 can obtain an equivalent focal length of about 150MM by satisfying various conditional expressions, thereby having a long-focus telephoto characteristic.

[0203] See also Fig.12The seventh embodiment of the present application provides an electronic device 1000 , including a housing 200 and an imaging module 100 , wherein the imaging module 100 is disposed in the housing 200 .

[0204] The electronic device 1000 of this embodiment includes but is not limited to 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 1000 that support imaging.

[0205] The optical imaging system 10 in the electronic device 1000 of this embodiment reasonably configures each lens so that the system meets the requirements of miniature design while increasing the focal length of the optical imaging system 10, which can be used for long-range shooting, improve the magnification, and achieve higher pixels and good image quality. At the same time, the optical imaging system 10 can obtain an equivalent focal length of about 150MM by satisfying various conditional expressions, thereby having a long-focus telephoto characteristic.

[0206] It is obvious to those skilled in the art that the present application is not limited to the details of the exemplary embodiments described above, and that the present application can be implemented in other specific forms without departing from the spirit or essential features of the present application. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present application is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present application.

[0207] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present application and are not intended to limit it. Although the present application has been described in detail with reference to the preferred embodiments, a person of ordinary skill in the art should understand that the technical solution of the present application may be modified or replaced by equivalents without departing from the spirit and scope of the technical solution of the present application.

Claims

1. An optical imaging system, characterized in that: The optical imaging system is composed of five lenses, and the optical imaging system includes, from the object side to the image side: A first lens has positive refractive power, and the object side surface of the first lens is convex at the near optical axis; The second lens has refractive power; The third lens has refractive power; a fourth lens element having refractive power; and a fifth lens having refractive power, wherein the object side surface of the fifth lens is concave near the circumference; The optical imaging system satisfies the following conditional formula: 43*f / (2*ImgH)>147, 2.12≤ΣCT / ΣAT≤4.16; Wherein, f is the effective focal length of the optical imaging system, ImgH is half of the image height corresponding to the maximum field angle of the optical imaging system, ΣCT is the sum of the thicknesses of the lenses of the optical imaging system on the optical axis, and ΣAT is the sum of the air spacings between adjacent lenses of the optical imaging system on the optical axis; The first lens, the second lens, the third lens, the fourth lens and the fifth lens are all made of plastic, or the first lens, the second lens, the third lens, the fourth lens and the fifth lens are all made of glass, or one or more of the first lens, the second lens, the third lens, the fourth lens and the fifth lens are made of glass, and the rest are made of plastic.

2. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following conditional formula: TTL / ImgH<6.7; Wherein, TTL is the distance from the object side of the first lens to the imaging surface of the optical imaging system on the optical axis.

3. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following conditional formula: TTL / f≤0.96; Wherein, TTL is the distance from the object side of the first lens to the imaging surface of the optical imaging system on the optical axis.

4. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following conditional formula: 3≤|f / f4|≤6; Wherein, f4 is the focal length of the fourth lens.

5. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following conditional formula: |f2 / R22|<142; Wherein, f2 is the focal length of the second lens, and R22 is the radius of curvature of the image side surface of the second lens at the optical axis.

6. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following conditional formula: 11mm <FNO*ImgH<13mm; 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: 0.6 <BF / TT<0.8; Wherein, BF is the minimum distance from the image side surface of the fifth lens to the imaging surface of the optical imaging system in a direction parallel to the optical axis, and TTL is the distance from the object side surface of the first lens to the imaging surface of the optical imaging system on the optical axis.

8. The optical imaging system according to any one of claims 1 to 7, characterized in that: The optical imaging system further comprises: The optical path deflecting element is arranged on the object side of the first lens and is used to change the propagation direction of the light.

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, wherein the imaging module is disposed on the housing.

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