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 is composed of six lenses with refractive power, and sequentially includes a first lens with positive refractive power, a second lens with negative refractive power, a third lens with positive refractive power, a fourth lens with positive refractive power, a fifth lens with negative refractive power, and a sixth lens with negative refractive power from the object side to the image side. The optical imaging system satisfies the following conditional expressions: -3mm<supgt;‑1< / supgt; < FNO / f6 < -0.1mm<supgt;‑1< / supgt>, -0.065mm / ° < f6 / FOV < -0.03mm / °; where FNO is the aperture number of the optical imaging system, f6 is the focal length of the sixth lens, and FOV is the maximum field of view angle of the optical imaging system. The above optical imaging system can obtain a higher clarity image in a larger field of view by balancing the relationship between the aperture number, the focal length of the sixth lens, and the field of view angle, and has a better imaging quality. Moreover, by arranging the lenses with positive refractive power and negative refractive power dispersedly, the generation of field curvature can be avoided, and high-order imaging quality can be satisfied.

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] Compared with the five-piece lens group, the general six-piece lens group can improve the resolution of the lens group, but its refractive power is too concentrated, resulting in the generation of field curvature of the system. The light convergence ability and correction system distortion are not ideal, and it has not yet met the requirements of high-end imaging quality. Summary of the invention

[0003] 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.

[0004] The embodiment of the present application provides an optical imaging system, which is composed of six lenses with refractive power, which include, from the object side to the image side, a first lens with positive refractive power, a second lens with negative refractive power, a third lens with positive refractive power, a fourth lens with positive refractive power, a fifth lens with negative refractive power, and a fifth lens with negative refractive power, and the optical imaging system satisfies the following conditional formula:

[0005] -3mm -1 <FNO / f6<-0.1mm -1 , -0.065mm / ゜<f6 / FOV<-0.03mm / ゜,1.7<|R51| / CT3<2.0;

[0006] Among them, FNO is the aperture number of the optical imaging system, f6 is the focal length of the sixth lens, FOV is the maximum field of view of the optical imaging system, R51 is the radius of curvature of the object side surface of the fifth lens at the near optical axis, and CT3 is the distance from the object side surface of the third lens to the image side surface of the third lens on the optical axis.

[0007] The above-mentioned optical imaging system can obtain high-definition imaging with good imaging quality in a larger field of view by balancing the relationship between the aperture number, the focal length of the sixth lens and the field of view angle. By dispersing the lenses with positive and negative refractive powers, the generation of field curvature can be avoided, thereby meeting high-order imaging quality requirements.

[0008] In some embodiments, the image side surface of the first lens is convex; the image side surface of the third lens is convex; the image side surface of the sixth lens is concave at the near optical axis, the object side surface and the image side surface of the sixth lens are both aspherical, and at least one of the object side surface and the image side surface has at least one inflection point.

[0009] In some embodiments, the optical imaging system satisfies the following condition:

[0010] 0.5mm -1 <tan(HFOV) / SD11<1.5mm -1 ;

[0011] Wherein, HFOV is half of the maximum field of view of the optical imaging system, and SD11 is the effective semi-diameter of the object side of the first lens.

[0012] In some embodiments, the optical imaging system satisfies the following condition:

[0013] 1.12 <SD22 / SD12<1.2;

[0014] Wherein, SD22 is the effective semi-diameter of the image side surface of the second lens, and SD12 is the effective semi-diameter of the image side surface of the first lens.

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

[0016] 1.3<(CT1+CT2) / (T12+T23)<1.6;

[0017] Among them, CT1 is the distance from the object side surface of the first lens to the image side surface of the first lens on the optical axis, CT2 is the distance from the object side surface of the second lens to the image side surface of the second lens on the optical axis, T12 is the distance from the image side surface of the first lens to the object side surface of the second lens on the optical axis, and T23 is the distance from the image side surface of the second lens to the object side surface of the third lens on the optical axis.

[0018] In some embodiments, the optical imaging system satisfies the following relationship:

[0019] 35 <vd3-vd2<40;

[0020] Wherein, vd2 is the Abbe number of the second lens, and vd3 is the Abbe number of the third lens.

[0021] In some embodiments, the optical imaging system satisfies the following condition:

[0022] 1.4<|RS7+RS8| / |RS7-RS8|<2.0;

[0023] Among them, RS7 is the curvature radius of the object side surface of the fourth lens at the near optical axis, and RS8 is the curvature radius of the image side surface of the fourth lens at the near optical axis.

[0024] The embodiment of the present application further proposes an imaging module, comprising:

[0025] The above optical imaging system; and

[0026] A photosensitive element is arranged on the image side of the optical imaging system.

[0027] The embodiment of the present application further provides an electronic device, including:

[0028] housing; and

[0029] As the imaging module mentioned above, the imaging module is mounted on the housing. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural diagram of the optical imaging system of the first embodiment of the present application.

[0031] Figure 2 This is a performance data diagram of simulated MTF versus field of view angle of the optical imaging system of the first embodiment of the present application.

[0032] Figure 3 4 is a field curvature and distortion curve diagram of the optical imaging system of the first embodiment of the present application.

[0033] Figure 4 It is a structural diagram of the optical imaging system of the second embodiment of the present application.

[0034] Figure 5 This is a performance data diagram of simulated MTF versus field of view angle of the optical imaging system of the second embodiment of the present application.

[0035] Figure 6 4 is a field curvature and distortion curve diagram of the optical imaging system of the second embodiment of the present application.

[0036] Figure 7 It is a structural diagram of the optical imaging system of the third embodiment of the present application.

[0037] Figure 8 This is a performance data diagram of simulated MTF versus field of view angle of the optical imaging system of the third embodiment of the present application.

[0038] Fig. 9 4 is a field curvature and distortion curve diagram of the optical imaging system of the third embodiment of the present application.

[0039] Fig.10 It is a structural schematic diagram of the imaging module of an embodiment of the present application.

[0040] Fig.11 It is a schematic diagram of the structure of an electronic device according to an embodiment of the present application.

[0041] Main component symbols

[0042] Image acquisition module 100

[0043] Optical imaging system 10

[0044] First lens L1

[0045] Second lens L2

[0046] The third lens L3

[0047] The fourth lens L4

[0048] Fifth lens L5

[0049] Sixth lens L6

[0050] Filter L7

[0051] Aperture STO

[0052] Imaging Surface IMA

[0053] Photosensitive element 20

[0054] Electronic device 200

[0055] Housing 210 DETAILED DESCRIPTION

[0056] 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.

[0057] See also Figure 1 An embodiment of the present application proposes an optical imaging system 10, which includes, from the object side to the image side, 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 positive refractive power, a fifth lens L5 with negative refractive power, a sixth lens L6 with negative refractive power and a filter L7.

[0058] The first lens L1 has an object-side surface S3 and an image-side surface S4, the second lens L2 has an object-side surface S5 and an image-side surface S6, the third lens L3 has an object-side surface S7 and an image-side surface S8, the fourth lens has an object-side surface S9 and an image-side surface S10, the fifth lens L5 has an object-side surface S11 and an image-side surface S12, and the sixth lens L6 has an object-side surface S13 and an image-side surface S14. Figure 1 In order to meet the design requirements, a virtual surface L0 needs to be provided, and the virtual surface L0 is connected to the object-side surface S1 of the first lens L1.

[0059] The optical imaging system 10 satisfies the following conditional formula:

[0060] -3mm -1 <FNO / f6<-0.1mm -1 , -0.065mm / ゜<f6 / FOV<-0.03mm / ゜;

[0061] Among them, FNO is the aperture number of the optical imaging system 10, f6 is the focal length of the sixth lens L6, and FOV is the maximum field of view of the optical imaging system 10.

[0062] The above-mentioned optical imaging system 10 can obtain high-definition imaging with good imaging quality in a larger field of view by balancing the relationship between the aperture number, the effective focal length of the sixth lens L6 and the field of view angle. By arranging lenses with positive and negative refractive powers in a dispersed manner, the generation of field curvature can be avoided, thereby meeting high-order imaging quality requirements.

[0063] In some embodiments, the image-side surface S4 of the first lens L1 is convex; the image-side surface S8 of the third lens L3 is convex; the image-side surface S14 of the sixth lens L6 is concave at the near optical axis, the object-side surface S13 and the image-side surface S14 of the sixth lens L6 are both aspherical surfaces, and at least one of the object-side surface S13 and the image-side surface S14 has at least one inflection point.

[0064] In some embodiments, the optical imaging system 10 satisfies the following conditional formula:

[0065] 0.5mm -1 <tan(HFOV) / SD11<1.5mm -1 ;

[0066] Wherein, HFOV is half of the maximum field of view of the optical imaging system 10, and SD11 is the effective semi-diameter of the object-side surface S3 of the first lens L1.

[0067] The first lens L1 that satisfies the above relationship can make the optical imaging system 10 show the characteristics of a larger field of view and a short total length, and is conducive to the compact arrangement of the structure and the realization of miniaturization. When tan(HFOV) / SD11<0.5, the effective semi-diameter of the object side S3 of the first lens L1 is too large, which is not conducive to the miniaturization of the head aperture of the optical imaging system 10. When tan(HFOV) / SD11>, the field of view of the optical imaging system 10 is too large, and the optical imaging system 10 is insufficient in its ability to collect light, resulting in poor imaging quality of the optical imaging system 10.

[0068] In some embodiments, the optical imaging system 10 satisfies the following conditional formula:

[0069] 1.12 <SD22 / SD12<1.2;

[0070] Here, SD22 is the effective semi-diameter of the image-side surface S6 of the second lens L2, and SD12 is the effective semi-diameter of the image-side surface S4 of the first lens L1.

[0071] When the above relationship is satisfied, it is beneficial to reduce the aperture size of the front end head of the optical imaging system 10, thereby achieving miniaturization.

[0072] In some embodiments, the optical imaging system 10 satisfies the following relationship:

[0073] 1.3<(CT1+CT2) / (T12+T23)<1.6;

[0074] Wherein, CT1 is the distance on the optical axis from the object side surface S3 of the first lens L1 to the image side surface S4 of the first lens L1, CT2 is the distance on the optical axis from the object side surface S5 of the second lens L2 to the image side surface S6 of the second lens L2, T12 is the distance on the optical axis from the image side surface S4 of the first lens L1 to the object side surface S5 of the second lens L2, and T23 is the distance on the optical axis from the image side surface S6 of the second lens L2 to the object side surface S7 of the third lens L3.

[0075] When the above relationship is satisfied, there is enough space for the three lenses during assembly to avoid collision between the first lens L1 and the second lens L2 or between the second lens L2 and the third lens L3. In addition, the increase of CT1 and CT2 is beneficial to increase the head depth of the optical imaging system 10 while reducing the sensitivity of the optical system.

[0076] In some embodiments, the optical imaging system 10 satisfies the following relationship:

[0077] 35 <vd3-vd2<40;

[0078] Wherein, vd2 is the Abbe number of the second lens L2, and vd3 is the Abbe number of the third lens L3.

[0079] Reasonable selection of lens materials can effectively correct the chromatic aberration of the optical imaging system 10 , improve the imaging clarity of the optical imaging system 10 , and thus enhance the imaging quality of the optical imaging system 10 .

[0080] In some embodiments, the optical imaging system 10 satisfies the following conditional formula:

[0081] 1.4<|RS7+RS8| / |RS7-RS8|<2.0;

[0082] Among them, RS7 is the curvature radius of the object-side surface S9 of the fourth lens L4 at the near optical axis, and RS8 is the curvature radius of the image-side surface S10 of the fourth lens L4 at the near optical axis.

[0083] The radius of curvature of the fourth lens L4 may affect the curvature of the fourth lens L4; when the above conditional expression is satisfied, the edge aberration of the optical imaging system 10 may be effectively corrected, the generation of astigmatism may be suppressed, and the angle of the main light of the peripheral viewing angle entering the image plane may be reduced.

[0084] In some embodiments, the optical imaging system 10 satisfies the following conditional formula:

[0085] 1.7<|R51| / CT3<2.0;

[0086] Wherein, R51 is the curvature radius of the object-side surface S11 of the fifth lens L5 at the near optical axis, and CT3 is the distance on the optical axis from the object-side surface S7 of the third lens L3 to the image-side surface S8 of the third lens L3.

[0087] By satisfying the conditional restrictions, the light can be further converged, making the surface of the fifth lens L5 smooth, and reducing the deviation of the incident angle and the exit angle of light in different fields of view, thereby reducing the sensitivity; and by setting a thicker third lens L3, the processing difficulty can be reduced and the thickness tolerance sensitivity can be reduced, thereby improving the yield.

[0088] In some embodiments, the optical imaging system 10 further includes a stop STO. The stop STO may be disposed on the surface of any lens, or disposed before the first lens L1, or disposed between any two lenses. Figure 1 In the embodiment, the stop STO is disposed on the object-side surface S3 of the first lens L1. The stop may be a glare stop or a field stop, etc., to reduce stray light and help improve image quality.

[0089] In some embodiments, the optical imaging system 10 also includes a filter L7, which has an object side surface S15 and an image side surface S16. The filter L7 is arranged on the image side of the fifth lens L5. The filter L7 can be an infrared filter to filter out light in other bands such as visible light and only allow infrared light to pass through, so that the optical imaging system 10 can also form images in dim environments and other special application scenarios.

[0090] First embodiment

[0091] Please continue to see Figure 1 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 negative refractive power, a third lens L3 with positive refractive power, a fourth lens L4 with positive refractive power, a fifth lens L5 with negative refractive power, a sixth lens L6 with negative refractive power and a filter L7.

[0092] The object-side surface S3 of the first lens L1 is convex at the near optical axis, and the image-side surface S4 is convex at the near optical axis.

[0093] The object-side surface S5 of the second lens L2 is convex at the near optical axis, and the image-side surface S6 is concave at the near optical axis.

[0094] The object-side surface S7 of the third lens L3 is concave at the near optical axis, and the image-side surface S8 is convex at the near optical axis.

[0095] The object-side surface S9 of the fourth lens L4 is concave at the near optical axis, and the image-side surface S10 is convex at the near optical axis.

[0096] The object-side surface S11 of the fifth lens L5 is concave at the near optical axis, and the image-side surface S12 is convex at the near optical axis.

[0097] The object-side surface S13 of the sixth lens L6 is convex at the near optical axis, and the image-side surface S14 is concave at the near optical axis. Both the object-side surface S13 and the image-side surface S14 of the sixth lens L6 are aspherical surfaces, and at least one of the object-side surface S13 and the image-side surface S14 has at least one inflection point.

[0098] 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 and the infrared filter L7 in sequence, and finally converges on the imaging surface IMA.

[0099] Table 1 shows the characteristics of the optical imaging system 10 of this embodiment. The reference wavelength of the focal length, refractive index and Abbe number is 555 nm, and the units of the radius of curvature, thickness and semi-diameter are all millimeters (mm).

[0100] Table 1

[0101]

[0102]

[0103] Wherein, EFL is the effective focal length of the optical imaging system 10 , FNO is the aperture number of the optical imaging system 10 , and FOV is the field of view of the optical imaging system 10 .

[0104] Table 2

[0105]

[0106] It should be noted that the object side surfaces and image side surfaces of the first to sixth lenses of the optical imaging system 10 are all aspherical surfaces. For the surfaces of these aspherical surfaces, the aspherical surface equations are:

[0107]

[0108] Wherein, Z represents the height parallel to the Z axis in the lens surface, r represents the radial distance from the vertex, c represents the curvature of the surface at the vertex, k represents the cone constant, and K4, K6, K8, K10, K12, and K14 represent the aspheric coefficients of the corresponding orders of the 4th, 6th, 8th, 10th, and 12th orders, respectively. In the embodiment of the present application, the object side and image side of the first to fifth lenses are all aspheric surfaces, and the cone constant k and aspheric coefficients corresponding to the surface of each aspheric surface are shown in Table 2.

[0109] Figure 2 The simulated MTF versus field of view performance data of the optical imaging system 10 in this embodiment is shown in FIG. 1 , with a reference wavelength of 550 nm. The horizontal axis represents the Y field offset angle, i.e., the angle of the field of view of the optical system 10 relative to the optical axis, in degrees; the vertical axis represents the OTF coefficient; S1 and T1 represent curves at a spatial frequency of 139 p / mm, which can reflect the contrast and resolution characteristics of the optical system 10.

[0110] Figure 3 From left to right are the field curvature curve and the distortion curve of the optical imaging system 10 in this embodiment, with a reference wavelength of 550 nm.

[0111] Depend on Figure 2 and Figure 3 From the curve, it can be seen that the sagittal field curvature value and the meridian field curvature value of the optical imaging system 10 are controlled between -0.2mm and 0.2mm, which makes it easier to manufacture the lens and reduces the manufacturing cost; the distortion of the optical imaging system 10 is controlled within 0 to 17%, that is, the deformation of the image formed by the optical imaging system 10 is small. Therefore, the optical imaging system 10 reflects that the simulated MTF has a good value, and the optical imaging system 10 has good imaging performance.

[0112] Second embodiment

[0113] See also Figure 4 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 negative refractive power, a third lens L3 with positive refractive power, a fourth lens L4 with positive refractive power, a fifth lens L5 with negative refractive power, a sixth lens L6 with negative refractive power and a filter L7.

[0114] The object-side surface S3 of the first lens L1 is convex at the near optical axis, and the image-side surface S4 is convex at the near optical axis.

[0115] The object-side surface S5 of the second lens L2 is convex at the near optical axis, and the image-side surface S6 is concave at the near optical axis.

[0116] The object-side surface S7 of the third lens L3 is concave at the near optical axis, and the image-side surface S8 is convex at the near optical axis.

[0117] The object-side surface S9 of the fourth lens L4 is concave at the near optical axis, and the image-side surface S10 is convex at the near optical axis.

[0118] The object-side surface S11 of the fifth lens L5 is concave at the near optical axis, and the image-side surface S12 is convex at the near optical axis.

[0119] The object-side surface S13 of the sixth lens L6 is convex at the near optical axis, and the image-side surface S14 is concave at the near optical axis. Both the object-side surface S13 and the image-side surface S14 of the sixth lens L6 are aspherical surfaces, and at least one of the object-side surface S13 and the image-side surface S14 has at least one inflection point.

[0120] 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 and the infrared filter L7 in sequence, and finally converges on the imaging surface IMA.

[0121] Table 3 shows the characteristics of the optical imaging system 10 of this embodiment. The reference wavelength of the focal length, refractive index and Abbe number is 555 nm, and the units of the radius of curvature, thickness and semi-diameter are all millimeters (mm).

[0122] Table 3

[0123]

[0124] Wherein, EFL is the effective focal length of the optical imaging system 10 , FNO is the aperture number of the optical imaging system 10 , and FOV is the field of view of the optical imaging system 10 .

[0125] Table 4

[0126]

[0127]

[0128] Figure 5 The figure is a performance data diagram of the simulated MTF versus field angle of the optical imaging system 10 in this embodiment, with a reference wavelength of 550nm. The horizontal axis represents the Y field offset angle, that is, the angle of the field of view of the optical imaging system 10 relative to the optical axis, in degrees; the vertical axis represents the OTF coefficient; S1 and T1 represent curves at a spatial frequency of 139p / mm, which can reflect the contrast characteristics and resolution characteristics of the optical system 10.

[0129] Figure 6 From left to right are the field curvature curve and the distortion curve of the optical imaging system 10 in this embodiment, with a reference wavelength of 550 nm.

[0130] Depend on Figure 5 and Figure 6 From the curve, it can be seen that the sagittal field curvature value and the meridian field curvature value of the optical imaging system 10 are controlled between -0.2mm and 0.2mm, which makes it easier to manufacture the lens and reduces the manufacturing cost; the distortion of the optical imaging system 10 is controlled within 0 to 17%, that is, the deformation of the image formed by the optical imaging system 10 is small. Therefore, the optical imaging system 10 reflects that the simulated MTF has a good value, and the optical imaging system 10 has good imaging performance.

[0131] Third embodiment

[0132] See also 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 negative refractive power, a third lens L3 with positive refractive power, a fourth lens L4 with positive refractive power, a fifth lens L5 with negative refractive power, a sixth lens L6 with negative refractive power and a filter L7.

[0133] The object-side surface S3 of the first lens L1 is convex at the near optical axis, and the image-side surface S4 is convex at the near optical axis.

[0134] The object-side surface S5 of the second lens L2 is convex at the near optical axis, and the image-side surface S6 is concave at the near optical axis.

[0135] The object-side surface S7 of the third lens L3 is concave at the near optical axis, and the image-side surface S8 is convex at the near optical axis.

[0136] The object-side surface S9 of the fourth lens L4 is concave at the near optical axis, and the image-side surface S10 is convex at the near optical axis.

[0137] The object-side surface S11 of the fifth lens L5 is concave at the near optical axis, and the image-side surface S12 is convex at the near optical axis.

[0138] The object-side surface S13 of the sixth lens L6 is convex at the near optical axis, and the image-side surface S14 is concave at the near optical axis. Both the object-side surface S13 and the image-side surface S14 of the sixth lens L6 are aspherical surfaces, and at least one of the object-side surface S13 and the image-side surface S14 has at least one inflection point.

[0139] 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 and the infrared filter L7 in sequence, and finally converges on the imaging surface IMA.

[0140] Table 5 shows the characteristics of the optical imaging system 10 of this embodiment. The reference wavelength of the focal length, refractive index and Abbe number is 555 nm, and the units of the radius of curvature, thickness and semi-diameter are all millimeters (mm).

[0141] Table 5

[0142]

[0143] Wherein, EFL is the effective focal length of the optical imaging system 10 , FNO is the aperture number of the optical imaging system 10 , and FOV is the field of view of the optical imaging system 10 .

[0144] Table 6

[0145]

[0146] Figure 8 The figure is a performance data diagram of the simulated MTF versus field angle of the optical imaging system 10 in this embodiment, with a reference wavelength of 550nm. The horizontal axis represents the Y field offset angle, that is, the angle of the field of view of the optical imaging system 10 relative to the optical axis, in degrees; the vertical axis represents the OTF coefficient; S1 and T1 represent the curves at a spatial frequency of 139p / mm, which can reflect the contrast characteristics and resolution characteristics of the optical imaging system 10.

[0147] Fig. 9 From left to right are the field curvature curve and the distortion curve of the optical imaging system 10 in this embodiment, with a reference wavelength of 550 nm.

[0148] Depend on Figure 8 and Fig. 9 From the curve, it can be seen that the sagittal field curvature value and the meridian field curvature value of the optical imaging system 10 are controlled between -0.2mm and 0.2mm, which makes it easier to manufacture the lens and reduces the manufacturing cost; the distortion of the optical imaging system 10 is controlled within 0 to 17%, that is, the deformation of the image formed by the optical imaging system 10 is small. Therefore, the optical imaging system 10 reflects that the simulated MTF has a good value, and the optical imaging system 10 has good imaging performance.

[0149] Table 7 shows the values ​​of FNO / f6, f6 / FOV, tan(HFOV) / SD11, SD22 / SD12, (CT1+CT2) / (T12+T23), vd3-vd2, |RS7+RS8| / |RS7-RS8| and |R5| / CT3 in the optical imaging systems of the first to third embodiments.

[0150] Table 7

[0151]

[0152] See also Fig.10 The optical imaging system 10 of the embodiment of the present application can be applied to the imaging module 100 of the embodiment of the present application. 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 disposed on the image side of the optical imaging system 10.

[0153] The photosensitive element 20 may be a complementary metal oxide semiconductor (MMOS) image sensor or a charge-coupled device (CCD).

[0154] See also Fig.11 The imaging module 100 of the embodiment of the present application can be applied to the electronic device 200 of the embodiment of the present application. The electronic device 200 includes a housing 210 and the imaging module 100 , and the imaging module 100 is mounted on the housing 210 .

[0155] The electronic device 200 of the embodiment of the present application includes but is not limited to a driving recorder, a smart phone, a tablet computer, a laptop computer, an e-book reader, a portable multimedia player (PMP), a portable phone, a video phone, a digital still camera, a mobile medical device, a wearable device, and other electronic devices that support imaging.

[0156] 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, comprising six lenses with refractive power, characterized in that: The optical imaging system includes, from the object side to the image side, a first lens having positive refractive power, a second lens having negative refractive power, a third lens having positive refractive power, a fourth lens having positive refractive power, a fifth lens having negative refractive power, and a sixth lens having negative refractive power, and the optical imaging system satisfies the following conditional formula: -3mm -1 <FNO / f6<-0.1mm -1 ,-0.065mm / ゜<f6 / FOV<-0.03mm / ゜,1.7<|R51| / CT3<2.0; Among them, FNO is the aperture number of the optical imaging system, f6 is the focal length of the sixth lens, FOV is the maximum field of view of the optical imaging system, R51 is the radius of curvature of the object side surface of the fifth lens at the near optical axis, and CT3 is the distance from the object side surface of the third lens to the image side surface of the third lens on the optical axis.

2. The optical imaging system according to claim 1, wherein: The image side surface of the first lens is convex; the image side surface of the third lens is convex; the image side surface of the sixth lens is concave at the near optical axis, the object side surface and the image side surface of the sixth lens are both aspherical, and at least one of the object side surface and the image side surface has at least one inflection point.

3. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following conditional formula: 0.5mm -1 <tan(HFOV) / SD11<1.5mm -1 ; Wherein, HFOV is half of the maximum field of view of the optical imaging system, and SD11 is the effective semi-diameter of the object side of the first lens.

4. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following conditional formula: 1.12 <SD22 / SD12<1.2; Wherein, SD22 is the effective semi-diameter of the image side surface of the second lens, and SD12 is the effective semi-diameter of the image side surface of the first lens.

5. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following relationship: 1.3<(CT1+CT2) / (T12+T23)<1.6; Among them, CT1 is the distance from the object side surface of the first lens to the image side surface of the first lens on the optical axis, CT2 is the distance from the object side surface of the second lens to the image side surface of the second lens on the optical axis, T12 is the distance from the image side surface of the first lens to the object side surface of the second lens on the optical axis, and T23 is the distance from the image side surface of the second lens to the object side surface of the third lens on the optical axis.

6. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following relationship: 35 <vd3-vd2<40; Wherein, vd2 is the Abbe number of the second lens, and vd3 is the Abbe number of the third lens.

7. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following conditional formula: 1.4<|RS7+RS8| / |RS7-RS8|<2.0; Among them, RS7 is the curvature radius of the object side surface of the fourth lens at the near optical axis, and RS8 is the curvature radius of the image side surface of the fourth lens at the near optical axis.

8. An imaging module, characterized in that: include: The optical imaging system according to any one of claims 1 to 7; and A photosensitive element is arranged on the image side of the optical imaging system.

9. An electronic device, characterized in that: include: case; and The imaging module as described in claim 8 is mounted on the housing.

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