Imaging systems and electronics

Abstract

The present invention discloses an imaging system and an electronic device. The imaging system includes, from the object side to the image side of the optical axis, a first lens with positive refractive power, a second lens with refractive power, a third lens with refractive power, a fourth lens with refractive power, a fifth lens with positive refractive power, and a sixth lens with negative refractive power. The object side surface of the first lens is convex, the object side surface of the fifth lens is concave at the circumference, the image side surface of the fifth lens is convex, the image side surface of the sixth lens is concave at the optical axis, the image side surface of the sixth lens is convex at the circumference, and at least one of the object side surface and the image side surface of the sixth lens includes at least one inflection point. The imaging system and the electronic device of the embodiment of the present invention have the above-mentioned reasonable lens configuration of the six lenses, so that the imaging system not only has good resolution to meet the high-resolution requirement, but also can reduce the height of the imaging system to meet the miniaturization requirement.

Description

Technical Field

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

[0002] With the advancement of semiconductor technology, the number of pixels in photosensitive elements has increased, and as a result, the resolution requirements for the imaging systems used with these elements have also increased. However, to correct for aberrations and improve resolution, it is usually necessary to increase the number of lenses in the imaging system, which results in a larger imaging system and makes it difficult to achieve a miniaturized imaging system. Summary of the Invention

[0003] Embodiments of the present invention provide an imaging system and an electronic device.

[0004] An imaging system according to an embodiment of the present invention includes, in order from the object side to the image side of the optical axis, a first lens having positive refractive power, a second lens having refractive power, a third lens having refractive power, a fourth lens having refractive power, a fifth lens having positive refractive power, and a sixth lens having negative refractive power. The object-side surface of the first lens is convex, the object-side surface of the fifth lens is concave at its circumference, the image-side surface of the fifth lens is convex, the image-side surface of the sixth lens is concave at its optical axis, and the image-side surface of the sixth lens is convex at its circumference. At least one of the object-side and image-side surfaces of the sixth lens includes at least one inflection point.

[0005] The imaging system of the embodiment of the present invention utilizes the aforementioned rational lens configuration of the six lenses. The imaging system not only has excellent resolution to meet high-resolution requirements, but also reduces the height of the imaging system to meet miniaturization requirements. Furthermore, the provision of an inflection point on the sixth lens effectively suppresses the angle at which light in the off-axis field of view is incident on the photosensitive element, thereby correcting aberrations in the off-axis field of view and improving imaging quality.

[0006] In certain embodiments, the imaging system satisfies the following relationship:

[0007] 0<|f / f2|+|f / f3|<2;

[0008] Wherein, f is the focal length of the imaging system, f2 is the focal length of the second lens, and f3 is the focal length of the third lens.

[0009] When the above relationship is satisfied, the second lens and the third lens have relatively suitable optical powers to match the overall optical power configuration of the imaging system, and are conducive to correcting aberrations around the image periphery, thereby improving the imaging quality of the imaging system.

[0010] In some embodiments, the imaging system further includes an aperture, and the imaging system satisfies the following relationship:

[0011] SL / TTL>0.85;

[0012] Wherein, SL is the distance from the aperture to the imaging surface on the optical axis, and TTL is the total length of the imaging system.

[0013] When the above relationship is satisfied, the imaging system can meet the requirements of high pixels, solve the problem of low-profile imaging system and dark images in large field of view, thereby expanding the time and environment in which the imaging system can be used.

[0014] In some embodiments, the imaging system includes a first lens group and a second lens group, the first lens group includes the first lens, the second lens, and the third lens, the second lens group includes the fourth lens, the fifth lens, and the sixth lens, and the imaging system satisfies the following relationship:

[0015] -1 <f13 / f46<1;

[0016] Wherein, f13 is the combined focal length of the first lens group, and f46 is the combined focal length of the second lens group.

[0017] When the above relationship is satisfied, the first lens, the third lens, the fifth lens, and the sixth lens have relatively suitable optical powers to match the overall optical power configuration of the imaging system, which is beneficial for correcting aberrations, improving the imaging quality of the imaging system, and facilitating the miniaturization of the imaging system.

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

[0019] |R9 / R10|<6;

[0020] Wherein, R9 is the curvature radius of the object-side surface of the fifth lens, and R10 is the curvature radius of the image-side surface of the fifth lens.

[0021] Meeting the above conditions ensures that the fifth lens has the appropriate dimensions, facilitating its manufacturing and assembly, thereby improving product yield. Furthermore, by properly assigning the radii of curvature on the object-side and image-side surfaces of the fifth lens, aberrations can be balanced, improving the imaging quality of the camera lens.

[0022] In certain embodiments, the imaging system satisfies the following relationship:

[0023] 0<|f / f5|+|f / f6|<5;

[0024] Wherein, f is the focal length of the imaging system, f5 is the focal length of the fifth lens, and f6 is the focal length of the sixth lens.

[0025] When the above relationship is satisfied, the fifth lens and the sixth lens have relatively suitable optical powers to match the overall optical power configuration of the imaging system, and are conducive to correcting aberrations around the image periphery, thereby improving the imaging quality of the imaging system.

[0026] In certain embodiments, the imaging system satisfies the following relationship:

[0027] (CT2+CT3+CT4) / f<0.3;

[0028] Wherein, f is the focal length of the imaging system, CT2 is the center thickness of the second lens, CT3 is the center thickness of the third lens, and CT4 is the center thickness of the fourth lens.

[0029] When the above relationship is satisfied, the thicknesses of the second through fourth lenses can be appropriately sized. This, on the one hand, reduces manufacturing difficulties, resulting in a higher lens production yield, and facilitates the moldability and uniformity of the lenses during injection molding. On the other hand, it also helps shorten the height of the entire imaging system, thereby promoting its miniaturization.

[0030] In certain embodiments, the imaging system satisfies the following relationship:

[0031] -40 <V1-V2<40;

[0032] Wherein, V1 is the Abbe number of the first lens, and V2 is the Abbe number of the second lens.

[0033] When the above relationship is satisfied, it is beneficial to correct the chromatic aberration of the imaging system, reduce the aberration, and improve the imaging quality of the imaging system.

[0034] In certain embodiments, the imaging system satisfies the following relationship:

[0035] EPD / f>0.5;

[0036] Wherein, f is the focal length of the imaging system, and EPD is the entrance pupil diameter of the imaging system.

[0037] When the above relationship is satisfied, it is beneficial to expand the entrance pupil diameter, increase the luminous flux, and improve the imaging quality. At the same time, a good balance can be achieved between telecentricity and wide-angle characteristics without making the overall length of the imaging system too long.

[0038] An electronic device according to an embodiment of the present invention includes the imaging system and a photosensitive element described in any one of the above embodiments, wherein the photosensitive element is arranged on the image side of the imaging system.

[0039] Through the above-mentioned rational lens configuration of the six lenses, the electronic device of the embodiment of the present invention not only has a good resolution of the imaging system to meet high-resolution requirements, but also can reduce the height of the imaging system to meet miniaturization requirements. In addition, the provision of an inflection point on the sixth lens can effectively suppress the angle at which light in the off-axis field of view is incident on the photosensitive element, thereby correcting the aberration of the off-axis field of view and improving the imaging quality.

[0040] Additional aspects and advantages of the embodiments of the present invention will be given in part in the following description and in part will be obvious from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments with reference to the following drawings, in which:

[0042] Figure 1 is a schematic structural diagram of an imaging system according to a first embodiment of the present invention;

[0043] Figure 2 is a longitudinal aberration diagram of the imaging system in the first embodiment (mm);

[0044] Figure 3 is a field curvature diagram (mm) of the imaging system in the first embodiment;

[0045] Figure 4 is a distortion diagram (%) of the imaging system in the first embodiment;

[0046] Figure 5 is a schematic structural diagram of an imaging system according to a second embodiment of the present invention;

[0047] Figure 6 is a longitudinal aberration diagram of the imaging system in the second embodiment (mm);

[0048] Figure 7 is a field curvature diagram (mm) of the imaging system in the second embodiment;

[0049] Figure 8 is a distortion diagram (%) of the imaging system in the second embodiment;

[0050] Figure 9 is a schematic structural diagram of an imaging system according to a third embodiment of the present invention;

[0051] Figure 10 is a longitudinal aberration diagram of the imaging system in the third embodiment (mm);

[0052] Figure 11 is a field curvature diagram (mm) of the imaging system in the third embodiment;

[0053] Figure 12 is a distortion diagram (%) of the imaging system in the third embodiment;

[0054] Figure 13 is a schematic structural diagram of an imaging system according to a fourth embodiment of the present invention;

[0055] Figure 14 is a longitudinal aberration diagram of the imaging system in the fourth embodiment (mm);

[0056] Figure 15 is a field curvature diagram (mm) of the imaging system in the fourth embodiment;

[0057] Figure 16 is a distortion diagram (%) of the imaging system in the fourth embodiment;

[0058] Figure 17 is a schematic structural diagram of an electronic device according to an embodiment of the present invention;

[0059] Figure 18 is a schematic structural diagram of an electronic device according to an embodiment of the present invention; and

[0060] Figure 19 is a schematic structural diagram of an electronic device according to another embodiment of the present invention; DETAILED DESCRIPTION

[0061] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and are not to be construed as limiting the present invention.

[0062] In the description of the present invention, 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, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the said features. In the description of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0063] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; mechanical connections, electrical connections, or mutual communication; direct connections or indirect connections through an intermediate medium; and internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0064] The disclosure below provides many different embodiments or examples for realizing different structures of the present invention. In order to simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are merely examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numbers and / or reference letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but those skilled in the art will recognize the application of other processes and / or the use of other materials.

[0065] Please also refer to Figure 1 、 Figure 5 、 Figure 9 and Figure 13 The imaging system 10 of the embodiment of the present invention includes, from the object side to the image side of the optical axis, a first lens L1 with positive refractive power, a second lens L2 with refractive power, a third lens L3 with refractive power, a fourth lens L4 with refractive power, a fifth lens L5 with positive refractive power, and a sixth lens L6 with negative refractive power.

[0066] The first lens L1 has an object-side surface S1 and an image-side surface S2. The object-side surface S1 of the first lens L1 is convex. The second lens L2 has an object-side surface S3 and an image-side surface S4. The third lens L3 has an object-side surface S5 and an image-side surface S6. The fourth lens L4 has an object-side surface S7 and an image-side surface S8. The fifth lens L5 has an object-side surface S9 and an image-side surface S10. The object-side surface S9 of the fifth lens L5 is concave at the circumference, and the image-side surface S10 of the fifth lens L5 is convex. The sixth lens L6 has an object-side surface S11 and an image-side surface S12. The image-side surface S12 of the sixth lens L6 is concave along the optical axis, and the image-side surface S12 of the sixth lens L6 is convex at the circumference. At least one of the object-side surface S11 and the image-side surface S12 of the sixth lens L6 includes at least one inflection point. For example, the object-side surface S11 of the sixth lens L6 includes at least one inflection point; or, the image-side surface S12 of the sixth lens L6 includes at least one inflection point; or, the object-side surface S11 of the sixth lens L6 includes at least one inflection point, and the image-side surface S12 of the sixth lens L6 also includes at least one inflection point.

[0067] The imaging system 10 of the embodiment of the present invention has a reasonable configuration of the six lenses as described above. The imaging system 10 not only has good resolution to meet the high-resolution requirement, but also can reduce the height of the imaging system 10 to meet the miniaturization requirement. In addition, the inflection point is set on the sixth lens L6 to effectively suppress the off-axis field of view light from being incident on the photosensitive element 20 ( Figure 17 ) to correct the aberration of the off-axis field of view and improve the imaging quality.

[0068] When the imaging system 10 is used for imaging, light emitted or reflected by the object OBJ enters the imaging system 10 from the object side, and sequentially passes through 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 having an object-side surface S13 and an image-side surface S14, and finally converges onto the imaging surface S15.

[0069] In some embodiments, the imaging system 10 further includes an aperture stop (not shown). The aperture stop can be an aperture stop or a field stop. The embodiments of the present invention are described using the aperture stop (not shown) as an example. The aperture stop (not shown) can be disposed on the surface of any lens, or before the first lens L1, or between any two lenses, or between the sixth lens L6 and the infrared filter L7. For example, in the first and second embodiments, the aperture stop (not shown) is disposed on the object-side surface S3 of the second lens L2; in the third and fourth embodiments, the aperture stop (not shown) is disposed on the image-side surface S2 of the first lens L1.

[0070] In some embodiments, the imaging system 10 satisfies the following relationship:

[0071] 1≤|f / f2|+|f / f3|<2;

[0072] Wherein, f is the focal length of the imaging system 10, f2 is the focal length of the second lens L2, and f3 is the focal length of the third lens L3.

[0073] That is to say, |f / f2|+|f / f3| can be any value in the interval [1, 2), for example, the value can be 1, 1.05, 1.2, 1.3, 1.4, 1.5, 1.6, 1.7, 1.8, 1.9, 1.95, 1.98, etc.

[0074] When the above relationship is satisfied, the second lens L2 and the third lens L3 have relatively suitable optical powers to match the overall optical power configuration of the imaging system 10, and are conducive to correcting aberrations around the image periphery, thereby improving the imaging quality of the imaging system 10.

[0075] In some embodiments, the imaging system 10 satisfies the following relationship:

[0076] 1≥SL / TTL>0.85;

[0077] Wherein, SL is the distance on the optical axis from the aperture (not shown) to the photosensitive element 20 (imaging surface S15), and TTL is the total length of the imaging system 10, that is, the distance on the optical axis from the object-side surface S1 of the first lens L1 to the imaging surface S15.

[0078] That is to say, SL / TTL can be any value in the interval (0.85, 1), for example, the value can be 0.86, 0.87, 0.89, 0.9, 0.92, 0.95, 0.98, 1, etc.

[0079] When the above relationship is satisfied, the imaging system 10 can meet the requirement of high pixel density, solve the problem of low profile of the imaging system 10 and dark images in a large field of view, thereby expanding the time and environment in which the imaging system 10 can be used.

[0080] In some embodiments, imaging system 10 includes a first lens group 12 and a second lens group 14. First lens group 12 includes the first lens L1, second lens 12, and third lens 13 described above. Second lens group 14 includes the fourth lens L4, fifth lens L5, and sixth lens L6 described above. Imaging system 10 satisfies the following relationship:

[0081] -1 <f13 / f46<1;

[0082] Wherein, f13 is the combined focal length of the first lens group 12 , and f46 is the combined focal length of the second lens group 14 .

[0083] That is to say, f13 / f46 can be any value between the interval (-1, 1), for example, the value can be -0.98, -0.95, -0.85, -0.7, -0.65, -0.5, -0.4, -0.25, -0.1, 0, 0.05, 0.1, 0.14, 0.2, 0.25, 0.3, 0.4, 0.5, 0.6, 0.7, 0.8, 0.9, 0.95, 0.98, etc.

[0084] When the above relationship is satisfied, the first lens L1 to the sixth lens L6 have relatively suitable optical powers to match the overall optical power configuration of the imaging system 10, which is beneficial for correcting aberrations, improving the imaging quality of the imaging system 10, and facilitating the miniaturization of the imaging system 10.

[0085] In some embodiments, the imaging system 10 satisfies the following relationship:

[0086] |R9 / R10|≤5;

[0087] Wherein, R9 is the curvature radius of the object-side surface S9 of the fifth lens L5, and R10 is the curvature radius of the image-side surface S10 of the fifth lens L5.

[0088] That is to say, |R9 / R10| can be any value in the interval (0, 5]. For example, the value can be 0.5, 0.6, 0.8, 1, 1.2, 1.3, 1.4, 1.6, 2, 2.5, 3, 3.4, 3.5, 3.7, 3.8, 4, 4.2, 4.4, 4.6, 4.8, 5, and so on.

[0089] Satisfying the above conditions ensures that fifth lens element L5 has the appropriate dimensions, facilitating its fabrication and assembly, thereby improving product yield. Furthermore, by properly assigning the radii of curvature of the object-side surface S9 and image-side surface S10 of fifth lens element L5, aberration balance is maintained, enhancing the imaging quality of imaging system 10.

[0090] In some embodiments, the imaging system 10 satisfies the following relationship:

[0091] 0.8≤|f / f5|+|f / f6|≤4.5;

[0092] Wherein, f5 is the focal length of the fifth lens L5, and f6 is the focal length of the sixth lens L6.

[0093] That is to say, |f / f5|+|f / f6| can be any value in the interval [0.8, 4.5]. For example, the value can be 0.8, 0.95, 1, 1.2, 1.4, 1.7, 2, 2.5, 3, 3.4, 4, 4.5, and so on.

[0094] When the above relationship is satisfied, the fifth lens L5 and the sixth lens L6 have relatively suitable optical powers to match the overall optical power configuration of the imaging system 10, and are beneficial for correcting aberrations around the periphery of the image, thereby improving the imaging quality of the imaging system 10.

[0095] In some embodiments, the imaging system 10 satisfies the following relationship:

[0096] 0.2≤(CT2+CT3+CT4) / f<0.3;

[0097] Wherein, CT2 is the center thickness of the second lens L2, CT3 is the center thickness of the third lens L3, and CT4 is the center thickness of the fourth lens L4.

[0098] That is to say, (CT2+CT3+CT4) / f can be any value in the interval [0.2, 0.3), for example, the value can be 0.2, 0.22, 0.25, 0.28, 0.29, etc.

[0099] When the above relationship is satisfied, the thicknesses of the second through fourth lenses L2 through L4 can be appropriately sized. This, on the one hand, reduces manufacturing difficulties, resulting in a higher lens production yield, and improves the moldability and uniformity of the lenses during injection molding. On the other hand, it also helps shorten the height of the entire imaging system 10, thereby promoting miniaturization of the imaging system 10.

[0100] In some embodiments, the imaging system 10 satisfies the following relationship:

[0101] -40 <V1-V2<40;

[0102] Wherein, V1 is the Abbe number of the first lens L1, and V2 is the Abbe number of the second lens L2.

[0103] That is to say, V1-V2 can be any value between the interval (-40, 40), for example, the value can be -39, -36, -30, -24, -20, -15, -10, -8, -7, -5.5, -4.8, -2.4, -1, 0, 1, 2, 4, 5.5, 7, 8, 10, 15, 20, 24, 30, 36, 39, etc.

[0104] When the above relationship is satisfied, it is beneficial to correct the chromatic aberration of the imaging system 10 , reduce the aberration, and improve the imaging quality of the imaging system 10 .

[0105] Please combine Figure 17 In some embodiments, the imaging system 10 satisfies the following relationship:

[0106] 0.8≥EPD / f>0.5;

[0107] Wherein, EPD is the entrance pupil diameter of the imaging system 10 .

[0108] That is, EPD / f can be any value in the interval [0.5, 0.8], for example, the value can be 0.51, 0.55, 0.6, 0.65, 0.7, 0.74, 0.8, etc.

[0109] When the above relationship is satisfied, it is beneficial to expand the entrance pupil diameter, increase the light flux, and improve the imaging quality. At the same time, a good balance can be achieved between telecentricity and wide-angle characteristics without making the overall length of the imaging system 10 too long.

[0110] When the above relationship is satisfied, the imaging system 10 has a smaller height, which is conducive to miniaturization.

[0111] In some embodiments, the first lens L1 , the second lens L2 , the third lens L3 , the fourth lens L4 , the fifth lens L5 , and the sixth lens L6 are all made of plastic.

[0112] Since the first lens L1 to the sixth lens L6 are all plastic lenses, the imaging system 10 can effectively eliminate aberrations and meet high pixel requirements while being ultra-thin and low-cost.

[0113] In some embodiments, at least one surface of at least one lens in the imaging system 10 is aspherical. For example, in the first embodiment, both the object-side surface and the image-side surface of the first lens L1 to the sixth lens L6 are aspherical.

[0114] In some embodiments, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the sixth lens L6 are all aspherical lenses. The shape of the aspherical surface is determined by the following formula:

[0115]

[0116] Where Z is the longitudinal distance from any point on the aspheric surface to the vertex of the surface, r is the distance from any point on the aspheric surface to the optical axis, c is the vertex curvature (the inverse of the curvature radius), k is the cone constant, and Ai is the correction coefficient of the i-th order aspheric surface.

[0117] In this way, the imaging system 10 can effectively reduce the total length of the imaging system 10 by adjusting the curvature radius and aspheric coefficient of each lens surface, and can effectively correct aberrations to improve imaging quality.

[0118] First embodiment

[0119] See also Figures 1 to 4 , the imaging system 10 satisfies the conditions in the following table:

[0120] Table 1

[0121]

[0122]

[0123] In Table 1, EFL is the effective focal length of the imaging system 10 , FNO is the focal ratio of the imaging system 10 , and FOV is the field of view of the imaging system 10 .

[0124] Table 2

[0125] Surface number S1 S2 S3 S4 S5 S6 K -1.09E+01 -1.34E+01 -9.98E+00 -9.90E+01 4.61E+01 -1.90E+01 A4 2.76E-01 5.31E-02 -2.60E-02 -1.08E-01 -1.22E-01 1.10E-01 A6 -5.09E-01 -1.95E-01 -1.00E-02 6.45E-01 7.50E-01 -2.83E-02 A8 9.91E-01 1.34E-01 -3.59E-01 -2.55E+00 -2.93E+00 -1.26E-01 A10 -1.78E+00 1.10E-01 1.48E+00 5.86E+00 7.03E+00 2.98E-01 A12 2.40E+00 -7.23E-01 -3.32E+00 -8.66E+00 -1.15E+01 -4.21E-01 A14 -2.26E+00 1.40E+00 4.69E+00 8.42E+00 1.26E+01 3.83E-01 A16 1.36E+00 -1.32E+00 -3.87E+00 -5.20E+00 -8.91E+00 -1.07E-01 A18 -4.56E-01 6.35E-01 1.70E+00 1.83E+00 3.63E+00 -8.49E-02 A20 6.46E-02 -1.26E-01 -3.09E-01 -2.78E-01 -6.45E-01 5.57E-02 Surface number S7 S8 S9 S10 S11 S12 K 7.57E+01 9.90E+01 -5.66E+01 9.90E+01 -3.79E+00 -4.04E+00 A4 -8.55E-02 -5.60E-02 2.01E-01 1.51E-01 -3.00E-01 -1.69E-01 A6 -4.48E-02 -2.51E-01 -4.97E-01 -1.66E-01 2.11E-01 1.04E-01 A8 6.69E-02 6.61E-01 7.55E-01 6.37E-02 -1.50E-01 -5.63E-02 A10 6.84E-01 -9.79E-01 -9.58E-01 -1.21E-02 7.89E-02 2.13E-02 A12 -2.58E+00 9.95E-01 8.62E-01 4.08E-03 -2.62E-02 -5.42E-03 A14 4.23E+00 -6.99E-01 -5.10E-01 -3.92E-03 5.40E-03 9.45E-04 A16 -3.76E+00 3.32E-01 1.85E-01 1.78E-03 -6.77E-04 -1.11E-04 A18 1.78E+00 -9.57E-02 -3.68E-02 -3.52E-04 4.76E-05 7.87E-06 A20 -3.52E-01 1.22E-02 3.05E-03 2.59E-05 -1.45E-06 -2.54E-07

[0126] The first embodiment has TTL=4.65, which meets the requirement of miniaturization.

[0127] Second embodiment

[0128] See also Figures 5 to 8 , the imaging system 10 satisfies the conditions in the following table:

[0129] Table 3

[0130]

[0131]

[0132] In Table 3, EFL is the effective focal length of the imaging system 10 , FNO is the focal ratio of the imaging system 10 , and FOV is the field of view of the imaging system 10 .

[0133] Table 4

[0134] Surface number S1 S2 S3 S4 S5 S6 K 2.83E-01 8.94E+01 1.80E+00 -1.38E+01 -6.31E+00 1.68E+01 A4 -1.02E-02 -1.68E-01 -3.32E-01 -2.82E-02 -2.01E-01 -1.68E-01 A6 7.13E-02 8.64E-01 1.29E+00 4.04E-01 1.25E-01 7.60E-02 A8 -1.54E-01 -1.98E+00 -2.81E+00 -9.13E-01 -1.94E-01 -6.97E-02 A10 1.43E-01 2.89E+00 3.84E+00 1.11E+00 1.23E-01 3.26E-02 A12 6.57E-02 -2.56E+00 -3.17E+00 -7.68E-01 -1.20E-01 -1.32E-02 A14 -1.76E-01 1.23E+00 1.42E+00 1.78E-01 3.79E-02 -1.24E-02 A16 8.25E-02 -2.24E-01 -2.68E-01 2.29E-02 4.11E-02 2.36E-02 A18 0.00E+00 0.00E+00 0.00E+00 0.00E+00 -1.59E-06 3.78E-06 A20 0.00E+00 0.00E+00 0.00E+00 0.00E+00 -3.26E-07 3.69E-07 Surface number S7 S8 S9 S10 S11 S12 K 9.00E+01 -7.67E+01 1.89E+00 -4.44E+00 -6.94E-01 -9.86E-01 A4 -7.21E-02 -1.07E-01 -3.96E-03 -6.16E-02 -8.43E-02 -3.55E-01 A6 1.44E-02 -4.78E-03 -1.82E-02 7.55E-02 2.24E-02 3.01E-01 A8 1.62E-02 -1.41E-02 5.22E-03 -3.85E-02 4.42E-03 -2.01E-01 A10 2.73E-04 7.20E-03 -1.30E-02 1.76E-02 -2.49E-03 9.28E-02 A12 -2.36E-03 2.43E-03 7.46E-03 -5.93E-03 3.77E-04 -2.87E-02 A14 -3.23E-03 1.89E-03 -4.74E-04 1.09E-03 -2.17E-05 5.79E-03 A16 9.75E-04 -4.74E-04 -1.88E-04 -7.82E-05 2.33E-07 -7.31E-04 A18 5.85E-06 2.90E-05 -1.11E-06 -5.81E-08 3.40E-10 5.23E-05 A20 -2.55E-06 5.55E-07 -6.85E-07 -4.35E-08 4.99E-10 -1.62E-06

[0135] The second embodiment has TTL=4.75, which meets the requirement of miniaturization.

[0136] Third embodiment

[0137] See also Figures 9 to 12 , the imaging system 10 satisfies the conditions in the following table:

[0138] Table 5

[0139]

[0140] In Table 5, EFL is the effective focal length of the imaging system 10 , FNO is the focal ratio of the imaging system 10 , and FOV is the field of view of the imaging system 10 .

[0141] Table 6

[0142]

[0143]

[0144] The third embodiment has TTL=4.75, which meets the requirement of miniaturization.

[0145] Fourth embodiment

[0146] See also Figures 13 to 16 , the imaging system 10 satisfies the conditions in the following table:

[0147] Table 7

[0148]

[0149] In Table 7, EFL is the effective focal length of the imaging system 10 , FNO is the focal ratio of the imaging system 10 , and FOV is the field of view of the imaging system 10 .

[0150] Table 8

[0151]

[0152]

[0153] The fourth embodiment has TTL=4.75, which meets the requirement of miniaturization.

[0154] See also Figure 17 and Figure 18 The imaging system 10 of the embodiment of the present invention can be applied to the electronic device 100 of the embodiment of the present invention. The electronic device 100 includes the imaging system 10 of any of the above embodiments and a photosensitive element 20. The photosensitive element 20 is disposed on the image side of the imaging system 10.

[0155] Specifically, the photosensitive element 20 may be a complementary metal oxide semiconductor (CMOS) image sensor or a charge-coupled device (CCD) image sensor.

[0156] The imaging system 10 of the electronic device 100 according to the embodiment of the present invention utilizes the aforementioned rational configuration of the six lenses. The imaging system 10 not only has excellent resolution to meet high-resolution requirements, but also reduces the height of the imaging system 10 to meet miniaturization requirements. Furthermore, the provision of an inflection point on the sixth lens L6 effectively suppresses the angle at which off-axis light rays are incident on the photosensitive element 20, thereby correcting aberrations in the off-axis field of view and improving imaging quality.

[0157] The electronic device 100 of the embodiment of the present invention includes but is not limited to a smart phone (such as Figure 18As shown), mobile phones, personal digital assistants (PDAs), game consoles, personal computers (PCs), cameras (as shown), Figure 17 As shown), smart watches, tablets (as Figure 19 ) and other information terminal devices or home appliances with camera functions, etc.

[0158] Throughout this specification, reference to terms such as "certain embodiments," "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, the exemplary descriptions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0159] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0160] Although the embodiments of the present invention have been shown and described above, it will be understood that the above embodiments are exemplary and are not to be construed as limitations on the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention. The scope of the present invention is defined by the claims and their equivalents.

Claims

1. An imaging system, characterized in that: There are six lenses with refractive power. The imaging system includes the following components from the object side to the image side along the optical axis: a first lens having positive refractive power, wherein the object-side surface of the first lens is convex and the image-side surface of the first lens is concave; a second lens having refractive power, wherein the object-side surface of the second lens is convex; a third lens having refractive power, wherein the object-side surface of the third lens is convex and the image-side surface of the third lens is concave; a fourth lens having refractive power; a fifth lens having positive refractive power, wherein the object-side surface of the fifth lens is concave at the circumference and the image-side surface of the fifth lens is convex; and a sixth lens having negative refractive power, wherein the image-side surface of the sixth lens is concave along the optical axis, the image-side surface of the sixth lens is convex along the circumference, and at least one of the object-side surface and the image-side surface of the sixth lens includes at least one inflection point; The imaging system satisfies the following relationship: 1≥SL / TTL>0.85; 0<|f / f5|+|f / f6|≤4.5; Wherein, f is the focal length of the imaging system, f5 is the focal length of the fifth lens, and f6 is the focal length of the sixth lens; SL is the distance from the aperture to the photosensitive element on the optical axis, and TTL is the total length of the imaging system.

2. The imaging system according to claim 1, wherein: The imaging system satisfies the following relationship: 1≤|f / f2|+|f / f3|<2; Wherein, f is the focal length of the imaging system, f2 is the focal length of the second lens, and f3 is the focal length of the third lens.

3. The imaging system according to claim 1, wherein: The imaging system includes a first lens group and a second lens group, the first lens group includes the first lens, the second lens, and the third lens, the second lens group includes the fourth lens, the fifth lens, and the sixth lens, and the imaging system satisfies the following relationship: -1 <f13 / f46<1; Wherein, f13 is the combined focal length of the first lens group, and f46 is the combined focal length of the second lens group.

4. The imaging system according to claim 1, wherein: The imaging system satisfies the following relationship: |R9 / R10|≤5; Wherein, R9 is the curvature radius of the object-side surface of the fifth lens, and R10 is the curvature radius of the image-side surface of the fifth lens.

5. The imaging system according to claim 1, wherein: The imaging system satisfies the following relationship: 0.8≤|f / f5|+|f / f6|≤4.5; Wherein, f is the focal length of the imaging system, f5 is the focal length of the fifth lens, and f6 is the focal length of the sixth lens.

6. The imaging system according to claim 1, wherein: The imaging system satisfies the following relationship: 0.2≤(CT2+CT3+CT4) / f<0.3; Wherein, f is the focal length of the imaging system, CT2 is the center thickness of the second lens, CT3 is the center thickness of the third lens, and CT4 is the center thickness of the fourth lens.

7. The imaging system according to claim 1, wherein: The imaging system satisfies the following relationship: -40 <V1-V2<40; Wherein, V1 is the Abbe number of the first lens, and V2 is the Abbe number of the second lens.

8. The imaging system according to claim 1, wherein: The imaging system satisfies the following relationship: 0.8≥EPD / f>0.5; Wherein, f is the focal length of the imaging system, and EPD is the entrance pupil diameter of the imaging system.

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

Images