Optical imaging systems, camera modules and electronic devices

Abstract

The present invention discloses an optical imaging system, a camera module and an electronic device. In order from the object side to the image side along the optical axis, the optical imaging system includes 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 negative refractive power and a prism. The object side surface of the first lens is convex near the optical axis, the image side surface of the second lens is concave near the optical axis, the object side surface of the third lens is aspherical, the image side surface of the third lens is aspherical, the image side surface of the fourth lens is convex near the optical axis, the image side surface of the fourth lens is convex at the circumference, the object side surface of the fourth lens is aspherical, the image side surface of the fourth lens is spherical, the object side surface of the fifth lens is concave near the optical axis, the image side surface of the fifth lens is convex near the optical axis, the object side surface of the fifth lens is spherical, and the image side surface of the fifth lens is aspherical. The prism is arranged on the object side of the first lens.

Description

Technical Field

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

[0002] Currently, the long-focal-length periscope prism structure has become the primary choice for achieving multiple magnification effects. The long-focal-length structure has a large physical focal length, which means that small FNOs must have a large aperture. This aperture limitation makes it difficult to reduce the FNO. Furthermore, due to the spatial limitations of the periscope module, it is difficult to significantly increase the size of the image plane, limiting the image quality and processability of micro-devices with periscope long-focal-length structures. Summary of the Invention

[0003] Embodiments of the present invention provide an optical imaging system, a camera module, and an electronic device.

[0004] An embodiment of the present invention provides an optical imaging system, which includes, in order from the object side to the image side along the optical axis, the optical imaging system:

[0005] a first lens having positive refractive power, wherein the object-side surface of the first lens is convex near the optical axis;

[0006] a second lens having refractive power, wherein the image-side surface of the second lens is concave near the optical axis;

[0007] a third lens having refractive power, wherein the object-side surface of the third lens is aspherical, and the image-side surface of the third lens is aspherical;

[0008] a fourth lens having refractive power, wherein the image side surface of the fourth lens is convex near the optical axis, the image side surface of the fourth lens is convex at the circumference, the object side surface of the fourth lens is aspherical, and the image side surface of the fourth lens is spherical; and

[0009] a fifth lens having negative refractive power, wherein the object-side surface of the fifth lens is concave near the optical axis, the image-side surface of the fifth lens is convex near the optical axis, the object-side surface of the fifth lens is spherical, and the image-side surface of the fifth lens is aspherical;

[0010] The optical imaging system further includes a prism, and the prism is arranged on the object side of the first lens.

[0011] The above-mentioned optical imaging system improves image quality and has good processability by balancing the size of the periscope module, maintaining a sufficient telephoto focal length, reducing the complexity of the surface shape, and reasonably distributing the refractive power of the lens.

[0012] In certain embodiments, the optical imaging system satisfies the following relationship:

[0013] 1.1<f / TTL15<2.1;

[0014] Wherein, f represents the focal length of the optical imaging system, and TTL15 represents the distance between the object-side surface of the first lens and the image-side surface of the fifth lens on the optical axis.

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

[0016] CT34 / |R31|<0.22;

[0017] Wherein, CT34 represents the distance between the image side surface of the third lens and the object side surface of the fourth lens on the optical axis, and R31 represents the curvature radius of the object side surface of the third lens at the optical axis.

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

[0019] 0.66<SD31 / SD52<1.0;

[0020] Wherein, SD31 represents the vertical distance from the optical axis to the maximum effective diameter of the object-side surface of the third lens, and SD52 represents the vertical distance from the optical axis to the maximum effective diameter of the image-side surface of the fifth lens.

[0021] In certain embodiments, the optical imaging system satisfies the following relationship:

[0022] |R41| / |f4|<4.3;

[0023] Wherein, R41 represents the curvature radius of the object side of the fourth lens at the optical axis, and f4 represents the focal length of the fourth lens.

[0024] In certain embodiments, the optical imaging system satisfies the following relationship:

[0025] |SAG32| / |SAG41|<6.3;

[0026] Wherein, SAG32 represents the sag at the maximum effective diameter of the image side surface of the third lens, and SAG41 represents the sag at the maximum effective diameter of the object side surface of the fourth lens.

[0027] In certain embodiments, the optical imaging system satisfies the following relationship:

[0028] 0.7<ET2 / CT2<1.4;

[0029] Wherein, ET2 represents the distance from the maximum effective diameter of the object side surface of the second lens to the maximum effective diameter of the image side surface in the direction of the optical axis, and CT2 represents the thickness of the second lens on the optical axis.

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

[0031] 0.7<(ET1+ET2+ET3) / (CT1+CT2+CT3)<1.1;

[0032] Wherein, ET1 represents the distance from the maximum effective diameter of the objective side surface of the first lens to the maximum effective diameter of the image side surface in the direction of the optical axis, ET2 represents the distance from the maximum effective diameter of the objective side surface of the second lens to the maximum effective diameter of the image side surface in the direction of the optical axis, ET3 represents the distance from the maximum effective diameter of the objective side surface of the third lens to the maximum effective diameter of the image side surface in the direction of the optical axis, CT1 represents the thickness of the first lens on the optical axis, CT2 represents the thickness of the second lens on the optical axis, and CT3 represents the thickness of the third lens on the optical axis.

[0033] In certain embodiments, the optical imaging system satisfies the following relationship:

[0034] (|f4|+|f5|) / |R41|<30.0;

[0035] Wherein, f4 represents the focal length of the fourth lens, f5 represents the focal length of the fifth lens, and R41 represents the curvature radius of the object side of the fourth lens at the optical axis.

[0036] An embodiment of the present invention provides a camera module, comprising:

[0037] Photosensitive element; and

[0038] In the optical imaging system described in any of the above embodiments, the photosensitive element is installed on the image side of the optical imaging system, and the photosensitive element is used to convert the light signal that passes through the optical imaging system and reaches the image side into an electrical signal.

[0039] The above-mentioned camera module improves image quality and has good workability by balancing the size of the periscope module, maintaining a sufficient telephoto focal length, reducing the complexity of the surface shape, and reasonably distributing the refractive power of the lens.

[0040] An embodiment of the present invention provides an electronic device, including:

[0041] housing; and

[0042] The camera module described in the above embodiment is installed in the shell.

[0043] The above-mentioned electronic device improves image quality and has good workability by balancing the size of the periscope module, maintaining a sufficient telephoto focal length, reducing the complexity of the surface shape, and reasonably distributing the refractive power of the lens.

[0044] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments with reference to the following drawings, in which:

[0046] Figure 1 1 is a schematic structural diagram of an optical imaging system according to a first embodiment of the present invention;

[0047] Figure 2 2 is a schematic diagram of another viewing direction of the optical imaging system according to the first embodiment of the present invention;

[0048] Figure 3A is a spherical aberration diagram (mm) of the optical imaging system according to the first embodiment of the present invention;

[0049] Figure 3B is an astigmatism diagram (mm) of the optical imaging system according to the first embodiment of the present invention;

[0050] Figure 3C is a distortion diagram (%) of the optical imaging system according to the first embodiment of the present invention;

[0051] Figure 4 is a schematic structural diagram of an optical imaging system according to a second embodiment of the present invention;

[0052] Figure 5 is another structural schematic diagram of the optical imaging system according to the second embodiment of the present invention;

[0053] Figure 6A is a spherical aberration diagram (mm) of the optical imaging system according to the second embodiment of the present invention;

[0054] Figure 6B is an astigmatism diagram (mm) of the optical imaging system of Example 2 of the present invention;

[0055] Figure 6C is a distortion diagram (%) of the optical imaging system according to the second embodiment of the present invention;

[0056] Figure 7 is a schematic structural diagram of an optical imaging system according to a third embodiment of the present invention;

[0057] Figure 8is another structural schematic diagram of the optical imaging system according to the third embodiment of the present invention;

[0058] Figure 9A is a spherical aberration diagram (mm) of the optical imaging system according to the third embodiment of the present invention;

[0059] Figure 9B is an astigmatism diagram (mm) of the optical imaging system of Example 3 of the present invention;

[0060] Figure 9C is a distortion diagram (%) of the optical imaging system according to the third embodiment of the present invention;

[0061] Figure 10 is a schematic structural diagram of an optical imaging system according to a fourth embodiment of the present invention;

[0062] Figure 11 is another structural schematic diagram of the optical imaging system according to the fourth embodiment of the present invention;

[0063] Figure 12A is a spherical aberration diagram (mm) of the optical imaging system according to the fourth embodiment of the present invention;

[0064] Figure 12B is an astigmatism diagram (mm) of the optical imaging system of Example 4 of the present invention;

[0065] Figure 12C is a distortion diagram (%) of the optical imaging system according to the fourth embodiment of the present invention;

[0066] Figure 13 is a schematic structural diagram of an optical imaging system according to a fifth embodiment of the present invention;

[0067] Figure 14 is another structural schematic diagram of the optical imaging system according to the fifth embodiment of the present invention;

[0068] Figure 15A is a spherical aberration diagram (mm) of the optical imaging system according to the fifth embodiment of the present invention;

[0069] Figure 15B is an astigmatism diagram (mm) of the optical imaging system of Example 5 of the present invention;

[0070] Figure 15C is a distortion diagram (%) of the optical imaging system according to the fifth embodiment of the present invention;

[0071] Figure 16 is a schematic structural diagram of an optical imaging system according to a sixth embodiment of the present invention;

[0072] Figure 17 is another structural schematic diagram of the optical imaging system according to the sixth embodiment of the present invention;

[0073] Figure 18Ais a spherical aberration diagram (mm) of the optical imaging system according to the sixth embodiment of the present invention;

[0074] Figure 18B is an astigmatism diagram (mm) of the optical imaging system according to Example 6 of the present invention;

[0075] Figure 18C is a distortion diagram (%) of the optical imaging system according to Example 6 of the present invention;

[0076] Figure 19 is a schematic structural diagram of an optical imaging system according to a seventh embodiment of the present invention;

[0077] Figure 20 is another structural schematic diagram of the optical imaging system according to the seventh embodiment of the present invention;

[0078] Figure 21A is a spherical aberration diagram (mm) of the optical imaging system according to the seventh embodiment of the present invention;

[0079] Figure 21B is an astigmatism diagram (mm) of the optical imaging system according to the seventh embodiment of the present invention;

[0080] Figure 21C is a distortion diagram (%) of the optical imaging system according to the seventh embodiment of the present invention;

[0081] Figure 22 is a schematic structural diagram of an optical imaging system according to an eighth embodiment of the present invention;

[0082] Figure 23 is another structural schematic diagram of the optical imaging system according to the eighth embodiment of the present invention;

[0083] Figure 24A is a spherical aberration diagram (mm) of the optical imaging system according to the eighth embodiment of the present invention;

[0084] Figure 24B is an astigmatism diagram (mm) of the optical imaging system according to the eighth embodiment of the present invention;

[0085] Figure 24C is a distortion diagram (%) of the optical imaging system according to Example 8 of the present invention;

[0086] Figure 25 is a schematic structural diagram of an optical imaging system according to a ninth embodiment of the present invention;

[0087] Figure 26 is another structural schematic diagram of the optical imaging system according to the ninth embodiment of the present invention;

[0088] Figure 27A is a spherical aberration diagram (mm) of the optical imaging system according to the ninth embodiment of the present invention;

[0089] Figure 27Bis an astigmatism diagram (mm) of the optical imaging system of Example 9 of the present invention;

[0090] Figure 27C is a distortion diagram (%) of the optical imaging system according to the ninth embodiment of the present invention;

[0091] Figure 28 is a schematic structural diagram of an optical imaging system according to a tenth embodiment of the present invention;

[0092] Figure 29 is another structural schematic diagram of the optical imaging system according to the tenth embodiment of the present invention;

[0093] Figure 30A is a spherical aberration diagram (mm) of the optical imaging system according to the tenth embodiment of the present invention;

[0094] Figure 30B is an astigmatism diagram (mm) of the optical imaging system according to the tenth embodiment of the present invention;

[0095] Figure 30C is a distortion diagram (%) of the optical imaging system according to Example 10 of the present invention;

[0096] Figure 31 1 is a schematic diagram of a camera module according to an embodiment of the present invention;

[0097] Figure 32 is a schematic structural diagram of an electronic device according to an embodiment of the present invention;

[0098] Figure 33 4 is a schematic diagram of a module of an electronic device according to an embodiment of the present invention.

[0099] Description of main component symbols:

[0100] Optical imaging system 10, prism 11, aperture 13, infrared filter 15;

[0101] electronic device 20;

[0102] Vehicle 100. DETAILED DESCRIPTION

[0103] 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.

[0104] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, a feature specified as "first" or "second" may explicitly or implicitly include one or more of the specified features. In the description of the present invention, "plurality" means two or more than two, unless otherwise specifically defined.

[0105] 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 broadly. For example, they may refer to fixed connections, removable connections, or integral connections. They may refer to mechanical connections or electrical connections. They may refer to direct connections or indirect connections through an intermediary, and they may refer to internal communication between two components or interactions between two components. Those skilled in the art will understand the specific meanings of these terms in the present invention based on the specific circumstances.

[0106] The disclosure of the present invention 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, and 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.

[0107] Please refer to Figure 1 Figure 30 shows an optical imaging system 10 provided in an embodiment of the present invention. In order from the object side to the image side along the optical axis L, the optical imaging system 10 includes a first lens L1 having positive refractive power, a second lens L2 having refractive power, a third lens L3 having refractive power, a fourth lens L4 having refractive power, and a fifth lens L5 having negative refractive power. The object-side surface of the first lens L1 is convex near the optical axis L. The image-side surface of the second lens L2 is concave near the optical axis L. The object-side surface of the third lens L3 is aspherical, and the image-side surface of the third lens L3 is aspherical. The image-side surface of the fourth lens L4 is convex near the optical axis L, and the image-side surface of the fourth lens L4 is convex at the circumference. The object-side surface of the fourth lens L4 is aspherical, and the image-side surface of the fourth lens L4 is spherical. The object-side surface of the fifth lens L5 is concave near the optical axis L, and the image-side surface of the fifth lens L5 is convex near the optical axis L. The object-side surface of the fifth lens L5 is spherical, and the image-side surface of the fifth lens L5 is aspherical. The optical imaging system 10 also includes a prism 11, which is disposed on the object side of the first lens L1.

[0108] The above-mentioned optical imaging system 10 provides a large aperture and effective imaging circle diameter by balancing the size of the periscope module, FNO, image plane size and optical system volume, maintains a sufficient telephoto focal length, reduces the complexity of the surface shape, and reasonably distributes the refractive power of the lens, thereby improving image quality and having good processability.

[0109] In some embodiments, the optical imaging system 10 satisfies the following relationship: 1.1<f / TTL15<2.1; where f represents the focal length of the optical imaging system 10, and TTL15 represents the distance between the object side surface of the first lens L1 and the image side surface of the fifth lens L5 on the optical axis L.

[0110] Specifically, in some embodiments, the focal length f (mm) of the optical imaging system 10 ranges from 8.4 to 10.5. By using a 43mm lens equivalent, the equivalent focal length of the optical imaging system 10 can reach 78.5-98.2mm. This provides a magnification effect of approximately 3.3-4.1 times greater than that of a conventional 24mm focal length lens, making it more suitable for portrait photography scenarios and making it easier to capture close-up shots of people at a reasonable object distance.

[0111] TTL15 reflects the actual space occupied by the optical lens. Specifically, in some embodiments, the value range of TTL15 (mm) is [4.33, 7.87], so as to maintain better performance and reduce the volume of the optical imaging system 10. In one embodiment, TTL15 is 4.33 mm. In this way, the length of the optical imaging system 10 in the lens module can be greatly reduced, which is more conducive to the arrangement of the lens support, facilitates the movement of the external power components (such as motors) used to adjust the optical imaging system 10, and meets the focusing requirements at different object distances.

[0112] Specifically, in some embodiments, f / TTL15 can be 1.631, 1.592, 1.605, 1.518, 1.457, 1.432, 1.247, 1.584, 2.079, 1.144, or any other value greater than 1.1 and less than 2.1.

[0113] In some embodiments, the optical imaging system 10 satisfies the following relationship: CT34 / |R31|<0.22; where CT34 represents the distance between the image side surface of the third lens L3 and the object side surface of the fourth lens L4 on the optical axis L, and R31 represents the curvature radius of the object side surface of the third lens L3 at the optical axis L.

[0114] Thus, by adjusting the distance between the third lens L3 and the fourth lens L4 and changing the curvature radius of the third lens L3 through the definition of the above relationship, the volume of the optical imaging system 10 can be further reduced, which helps to reduce the thickness of the lens module.

[0115] Specifically, in some embodiments, CT34 / |R31| can be 0.216, 0.174, 0.105, 0.075, 0.061, 0.079, 0.078, 0.092, 0.081, 0.120, and any other value less than 0.22.

[0116] In addition, since the third lens L3 adopts a smaller aspheric order, the complexity of the surface change is reduced, and the surface shape is simpler, which makes the lens have good molding properties, low molding difficulty, and high practicality.

[0117] Furthermore, it is understood that exceeding the specified range of the aforementioned relationship (i.e., CT34 / |R31| ≥ 0.22) will affect the molding conditions of the lens, making it difficult to achieve a good balance in the distribution of lens aberrations, which is not conducive to reducing tolerance sensitivity and, in turn, will reduce the production yield of the actual product.

[0118] In some embodiments, the optical imaging system 10 satisfies the following relationship: 0.66<SD31 / SD52<1.0; wherein SD31 represents the vertical distance from the optical axis L to the maximum effective diameter of the object-side surface of the third lens element L3, and SD52 represents the vertical distance from the optical axis L to the maximum effective diameter of the image-side surface of the fifth lens element L5.

[0119] Thus, by the definition of the above relationship, the vertically incident light path can be deflected by 90°, so that the optical imaging system 10 can be placed horizontally in a micro device (such as a micro camera).

[0120] Specifically, in some embodiments, SD31 / SD52 can be 0.756, 0.744, 0.760, 0.758, 0.739, 0.667, 0.720, 0.909, 0.991, 0.772, or any other value greater than 0.66 and less than 1.0.

[0121] The lens aperture determines the thickness of the optical imaging system 10. In some embodiments, the lens aperture ranges from [1.4, 2.22]. The vertical distance from the optical axis L at the maximum effective diameter of a lens side can be understood as the lens aperture. A reasonable lens aperture can avoid excessive lens size, which would otherwise increase the volume of the optical imaging system 10. When the aperture of the third lens L3 is smaller than that of the fifth lens L5, marginal light can enter the image plane at an appropriate angle of incidence, which facilitates the correction of marginal field aberrations.

[0122] In addition, by setting the aperture 13 in front, the relationship between the imaging circle size, fno and the lens aperture can be fully balanced, so that fno can be magnified to 2.64, thereby providing sufficient incident light, which is beneficial to improving image quality.

[0123] In some embodiments, the optical imaging system 10 satisfies the following relationship: |R41| / |f4|<4.3; where R41 represents the radius of curvature of the object-side surface of the fourth lens L4 at the optical axis L, and f4 represents the focal length of the fourth lens L4.

[0124] Thus, by adjusting the focal length of the fourth lens element L4 to a positive or negative value through the aforementioned relationship, and coordinating the focal length distribution of the front lens group (i.e., the first lens element L1, the second lens element L2, and the third lens element L3), the design of the optical imaging system 10 can be made more flexible.

[0125] Specifically, in some embodiments, |R41| / |f4| can be 0.978, 0.951, 0.945, 0.843, 0.913, 4.239, 0.265, 0.036, 0.331, 0.377, or any other value less than 4.3.

[0126] In addition, the object-side surface of the fourth lens L4 adopts an aspherical design, and the image-side surface of the fourth lens L4 adopts a spherical design, which can reduce the complexity of the surface shape and enable the optical imaging system 10 to obtain a good aberration balance effect. The high-order aberrations can be controlled at a reasonable level, and the tolerance allocation is easier.

[0127] Furthermore, it is understood that if the relationship exceeds the specified range (i.e., |R41| / |f4| ≥ 4.3), it will be difficult for the fourth lens element L4 to achieve a small curvature effect, and it will also be difficult for each field of view light to enter and exit the fourth lens element L4 at a small angle. Small light angle deflection will result in a large loss of reflected energy, making it impossible to achieve a better relative brightness on the image plane.

[0128] In some embodiments, the optical imaging system 10 satisfies the following relationship: |SAG32| / |SAG41|<6.3; wherein SAG32 represents the sag at the maximum effective diameter of the image side surface of the third lens L3, and SAG41 represents the sag at the maximum effective diameter of the object side surface of the fourth lens L4.

[0129] In this way, the above-mentioned relationship can be used to avoid excessive lens curvature, which can lead to large light deflection angles and increased molding difficulty. This allows for a reasonable lens curvature, facilitating the distribution of focal lengths among the lenses, providing a reasonable light deflection angle, reducing the concentration of primary aberrations on a single lens, and facilitating adjustment of tolerance sensitivity to a reasonable range. In one embodiment, the sag heights of the third lens element L3 and the fourth lens element L4 are both less than 0.55.

[0130] Specifically, in some embodiments, |SAG32| / |SAG41| can take the values ​​of 1.887, 1.607, 1.530, 1.225, 1.654, 2.044, 6.254, 0.121, 0.014, 0.289, and any other value less than 6.3.

[0131] Furthermore, it is understood that if the relationship exceeds the specified range (i.e., |SAG32| / |SAG41| ≥ 6.3), the curvature of the third lens element L3 and the fourth lens element L4 becomes unfavorable for coordination, making it difficult for the third lens element L3 and the fourth lens element L4 to effectively balance primary aberrations such as spherical aberration and coma caused by the front lens group (i.e., the first lens element L1, the second lens element L2, and the third lens element L3). This is detrimental to the rational distribution of refractive power among the lenses, and is also detrimental to improving image quality and reducing tolerance sensitivity.

[0132] In some embodiments, the optical imaging system 10 satisfies the following relationship: 0.7<ET2 / CT2<1.4; wherein ET2 represents the distance from the maximum effective diameter of the object side surface of the second lens L2 to the maximum effective diameter of the image side surface in the direction of the optical axis L, and CT2 represents the thickness of the second lens L2 along the optical axis L.

[0133] It can be understood that ET2 / CT2 represents the thickness ratio of the second lens element L2. Specifically, the larger the thickness ratio, the more difficult the lens molding process becomes and the greater the manufacturing risk. When the thickness ratio is less than 1.4, a significant difference between the center and edge thicknesses of the lens is minimized. Thus, by defining this relationship, the second lens element L2 exhibits excellent manufacturability and molding conditions, with low manufacturing risk.

[0134] Specifically, in some embodiments, ET2 / CT2 can be 1.273, 1.340, 1.337, 1.381, 1.375, 1.363, 1.286, 0.714, 0.958, 1.350, or any other value greater than 0.7 and less than 1.4.

[0135] In addition, when the aperture of the second lens L2 is slightly smaller than that of the first lens L1, the marginal light passing through the periphery of the aperture can be compressed, which facilitates further deflection of the light by the rear lens group (i.e., the fourth lens L4 and the fifth lens L5), and is beneficial to the control of tolerance sensitivity.

[0136] Furthermore, it is understood that if the relationship exceeds the specified range (i.e., ET2 / CT2 ≤ 0.7 or ET2 / CT2 ≥ 1.4), the curvature of the second lens element L2 will be relatively large, and when used in conjunction with the first lens element L1, the amount of primary aberrations introduced will be relatively large, which is not conducive to achieving aberration balance and obtaining a better resolution.

[0137] In some embodiments, the optical imaging system 10 satisfies the following relationship:

[0138] 0.7<(ET1+ET2+ET3) / (CT1+CT2+CT3)<1.1; wherein, ET1 represents the distance from the maximum effective diameter of the object-side surface of the first lens element L1 to the maximum effective diameter of the image-side surface in the direction of the optical axis L, ET2 represents the distance from the maximum effective diameter of the object-side surface of the second lens element L2 to the maximum effective diameter of the image-side surface in the direction of the optical axis L, ET3 represents the distance from the maximum effective diameter of the object-side surface of the third lens element L3 to the maximum effective diameter of the image-side surface in the direction of the optical axis L, CT1 represents the thickness of the first lens element L1 along the optical axis L, CT2 represents the thickness of the second lens element L2 along the optical axis L, and CT3 represents the thickness of the third lens element L3 along the optical axis L.

[0139] As such, as defined by the aforementioned relationship, the edge thicknesses of the first lens L1, the second lens L2, and the third lens L3 are all slightly greater than their central thicknesses, resulting in a positive lens structure overall. Light rays passing through the first lens L1, the second lens L2, and the third lens L3 in sequence tend to contract inward, facilitating their expansion through the rear lens group (i.e., the fourth lens L4 and the fifth lens L5).

[0140] Specifically, in some embodiments, (ET1+ET2+ET3) / (CT1+CT2+CT3) can be 0.921, 0.931, 0.929, 0.977, 1.002, 0.852, 0.826, 0.748, 0.728, 0.807, or any other value greater than 0.7 and less than 1.1. When (ET1+ET2+ET3) / (CT1+CT2+CT3) is approximately 0.9, the shapes of the first lens L1, the second lens L2, and the third lens L3 are relatively simple and have a reasonable aspect ratio.

[0141] Furthermore, it is understood that when the above relationship is exceeded (i.e., (ET1+ET2+ET3) / (CT1+CT2+CT3)≤0.7, or (ET1+ET2+ET3) / (CT1+CT2+CT3)≥1.1), it is difficult for the first lens L1, the second lens L2, and the third lens L3 to meet favorable molding conditions, which is not conducive to reasonably coordinating the spacing between them and is also not conducive to subsequent production and assembly.

[0142] In some embodiments, the optical imaging system 10 satisfies the following relationship: (|f4|+|f5|) / |R41|<30.0; where f4 represents the focal length of the fourth lens L4, f5 represents the focal length of the fifth lens L5, and R41 represents the curvature radius of the object side of the fourth lens L4 at the optical axis L.

[0143] Thus, through the definition of the above relationship, when the fourth lens L4 and the fifth lens L5 have different effective refractive indices, the fourth lens L4 and the fifth lens L5 can be reasonably matched with each other and combined with the front lens group to produce a variety of lens combinations, thereby meeting various requirements of long focus, high image quality, and reasonable tolerances.

[0144] Specifically, in some embodiments, (|f4|+|f5|) / |R41| can take the value of 3.608, 3.803, 3.864, 5.333, 6.147, 0.416, 6.112, 29.115, 6.617, 7.279, and any other value less than 30.0.

[0145] In addition, the fourth lens L4 and the fifth lens L5 both have a surface design of an aspherical surface combined with a spherical surface, which makes the surface shape simple and has good manufacturability.

[0146] In addition, it can be understood that when the value exceeds the specified range of the above relationship (i.e., (|f4|+|f5|) / |R41|≥30.0), it is difficult for the fourth lens element L4 and the fifth lens element L5 to deflect the marginal light at an appropriate angle, which is not conducive to reducing ghost images, balancing aberrations, and improving overall image quality.

[0147] In addition, in an embodiment of the present invention, the shape of the aspheric surface is determined by the following formula:

[0148]

[0149] Where h is the height from any point on the aspheric surface to the optical axis, c is the vertex curvature, k is the cone constant, and Ai is the correction coefficient of the i-th order aspheric surface.

[0150] The present invention will be described in detail through the following specific embodiments with reference to the accompanying drawings.

[0151] Example 1:

[0152] Please refer to Figure 1 To Figure 3, where Figure 2 for Figure 1 Schematic diagram of the structure of the optical imaging system 10 taken along the positive direction of the Y axis. In the optical imaging system 10 of this embodiment, from the object side to the image side, it includes a prism 11, an aperture 13, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and an infrared filter 15.

[0153] The first lens L1 has positive refractive power, with its object-side surface S11 being convex and its image-side surface S12 being convex, and both S11 and S12 being aspherical. The second lens L2 has negative refractive power, with its object-side surface S21 being convex and its image-side surface S22 being concave, and both S21 and S22 being aspherical. The third lens L3 has negative refractive power, with its object-side surface S31 being convex and its image-side surface S32 being concave, and both S31 and S32 being aspherical. The fourth lens L4 has positive refractive power, with its object-side surface S41 being convex and its image-side surface S42 being convex, with S41 being aspherical and S42 being spherical. The fifth lens L5 has negative refractive power, with its object-side surface S51 being concave and its image-side surface S52 being convex, with S51 being spherical and S52 being aspherical.

[0154] In the first embodiment, the aperture number fno of the optical imaging system 10 is 2.64, the field of view angle range FOV of the optical imaging system 10 is 25°, the total system length TTL of the optical imaging system 10 is 9.93 mm, and the focal length f of the optical imaging system 10 is 10.18 mm.

[0155] The distance between the object-side surface S11 of the first lens L1 and the image-side surface S52 of the fifth lens L5 on the optical axis L is TTL15 = 6.24 mm, the distance between the image-side surface S32 of the third lens L3 and the object-side surface S41 of the fourth lens L4 on the optical axis L is CT34 = 1.17 mm, the radius of curvature of the object-side surface of the third lens L3 at the optical axis L is R31 = 5.43 mm, the perpendicular distance SD31 of the maximum effective diameter of the object-side surface of the third lens L3 from the optical axis L is 1.46 mm, the perpendicular distance SD52 of the maximum effective diameter of the image-side surface of the fifth lens L5 from the optical axis L is 1.93 mm, the radius of curvature of the object-side surface of the fourth lens L4 at the optical axis L is R41 = 7.09 mm, and the focal length f4 of the fourth lens L4 is 7.2520 m m, the sag height SAG32 of the image-side surface S32 of the third lens L3 at the maximum effective diameter = 0.44 mm, the sag height SAG41 of the object-side surface S41 of the fourth lens L4 at the maximum effective diameter = 0.23 mm, the thickness ET1 of the first lens L1 at the maximum effective diameter = 1.25 mm, the thickness ET2 of the second lens L2 at the maximum effective diameter = 1.01 mm, the thickness ET3 of the third lens L3 at the maximum effective diameter = 0.63 mm, the thickness CT1 of the first lens L1 along the optical axis L = 1.94 mm, the thickness CT2 of the second lens L2 along the optical axis L = 0.79 mm, the thickness CT3 of the third lens L3 along the optical axis L = 0.40 mm, and the focal length f5 of the fifth lens L5 = -18.3473 mm.

[0156] The optical imaging system 10 also satisfies the conditions in the following table:

[0157] Table 1

[0158]

[0159] Table 2

[0160]

[0161]

[0162] Figure 3A 、 Figure 3B 、 Figure 3C They are respectively the spherical aberration curve diagram, the astigmatism curve diagram and the distortion curve diagram in the first embodiment.

[0163] The horizontal axis of the spherical aberration curve represents the focus offset, and the vertical axis represents the normalized field of view. Figure 3A When the wavelengths given are 656.2725 nm, 587.5618 nm, 546.0740 nm, 486.1327 nm, and 435.8343 nm, respectively, the focus shifts of different fields of view are all within ±0.05 mm, indicating that the spherical aberration of the optical imaging system 10 in this embodiment is small and the imaging quality is good.

[0164] The horizontal axis of the astigmatism curve represents the focus shift, and the vertical axis represents the image height. Figure 3B The astigmatism curve given in shows that when the wavelength is 546.0740 nm, the focus shifts of the sagittal image plane and the meridional image plane are both within ±0.05 mm, indicating that the astigmatism of the optical imaging system 10 in this embodiment is small and the imaging quality is good.

[0165] The horizontal axis of the distortion curve represents the distortion rate, and the vertical axis represents the image height. Figure 3C The distortion curve given in shows that the distortion at a wavelength of 546.0740 nm is within ±2.5%, indicating that the distortion of the optical imaging system 10 in this embodiment is well corrected and the imaging quality is good.

[0166] As can be seen from FIG3 , the optical imaging system 10 provided in the first embodiment can achieve good imaging effects.

[0167] It should be noted that in Figure 1 and Figure 2 In the illustrated embodiment, light from the object side enters the prism 11 in a direction perpendicular to the optical axis L, causing the light to enter the first lens L1 in a direction parallel to the optical axis L, and then pass through the second lens L2, the third lens L3, the fourth lens L4, and the fifth lens L5 in sequence along the optical axis L, ultimately reaching the image side of the optical imaging system 10. It will be appreciated that by adjusting the angle of the light reflection surface of the prism 11, light from the object side at other angles to the optical axis L can enter the prism 11 and ultimately enter the first lens L1 in a direction parallel to the optical axis L. The specific principles of other embodiments can be referred to the above embodiments and will not be elaborated on here.

[0168] Example 2:

[0169] Please refer to Figure 4 To Figure 6, where Figure 5 for Figure 4 Schematic diagram of the structure of the optical imaging system 10 taken along the positive direction of the Y axis. In the optical imaging system 10 of this embodiment, from the object side to the image side, it includes a prism 11, an aperture 13, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and an infrared filter 15.

[0170] The first lens L1 has positive refractive power, with its object-side surface S11 being convex and its image-side surface S12 being convex, and both S11 and S12 being aspherical. The second lens L2 has negative refractive power, with its object-side surface S21 being convex and its image-side surface S22 being concave, and both S21 and S22 being aspherical. The third lens L3 has negative refractive power, with its object-side surface S31 being convex and its image-side surface S32 being concave, and both S31 and S32 being aspherical. The fourth lens L4 has positive refractive power, with its object-side surface S41 being convex and its image-side surface S42 being convex, with S41 being aspherical and S42 being spherical. The fifth lens L5 has negative refractive power, with its object-side surface S51 being concave and its image-side surface S52 being convex, with S51 being spherical and S52 being aspherical.

[0171] In the second embodiment, the aperture number fno of the optical imaging system 10 is 2.64, the field of view angle range FOV of the optical imaging system 10 is 26.26°, the total system length TTL of the optical imaging system 10 is 9.58 mm, and the focal length f of the optical imaging system 10 is 9.68 mm.

[0172] The distance between the object-side surface S11 of the first lens L1 and the image-side surface S52 of the fifth lens L5 on the optical axis L is TTL15 = 6.08 mm, the distance between the image-side surface S32 of the third lens L3 and the object-side surface S41 of the fourth lens L4 on the optical axis L is CT34 = 0.99 mm, the radius of curvature of the object-side surface of the third lens L3 at the optical axis L is R31 = 5.67 mm, the perpendicular distance SD31 of the maximum effective diameter of the object-side surface of the third lens L3 from the optical axis L is 1.43 mm, the perpendicular distance SD52 of the maximum effective diameter of the image-side surface of the fifth lens L5 from the optical axis L is 1.93 mm, the radius of curvature of the object-side surface of the fourth lens L4 at the optical axis L is R41 = 6.55 mm, and the focal length f4 of the fourth lens L4 is 6.8819 m m, the sag height SAG32 of the image-side surface S32 of the third lens L3 at the maximum effective diameter = 0.40 mm, the sag height SAG41 of the object-side surface S41 of the fourth lens L4 at the maximum effective diameter = 0.25 mm, the thickness ET1 of the first lens L1 at the maximum effective diameter = 1.22 mm, the thickness ET2 of the second lens L2 at the maximum effective diameter = 1.02 mm, the thickness ET3 of the third lens L3 at the maximum effective diameter = 0.61 mm, the thickness CT1 of the first lens L1 along the optical axis L = 1.90 mm, the thickness CT2 of the second lens L2 along the optical axis L = 0.76 mm, the thickness CT3 of the third lens L3 along the optical axis L = 0.40 mm, and the focal length f5 of the fifth lens L5 = -18.0138 mm.

[0173] The optical imaging system 10 also satisfies the conditions in the following table:

[0174] Table 3

[0175]

[0176]

[0177] Table 4

[0178]

[0179] Figure 6A 、 Figure 6B 、 Figure 6C They are respectively the spherical aberration curve diagram, the astigmatism curve diagram and the distortion curve diagram in the second embodiment.

[0180] The horizontal axis of the spherical aberration curve represents the focus offset, and the vertical axis represents the normalized field of view. Figure 6A When the wavelengths given are 656.2725 nm, 587.5618 nm, 546.0740 nm, 486.1327 nm, and 435.8343 nm, respectively, the focus shifts of different fields of view are all within ±0.05 mm, indicating that the spherical aberration of the optical imaging system 10 in this embodiment is small and the imaging quality is good.

[0181] The horizontal axis of the astigmatism curve represents the focus shift, and the vertical axis represents the image height. Figure 6B The astigmatism curve given in shows that when the wavelength is 546.0740 nm, the focus shifts of the sagittal image plane and the meridional image plane are both within ±0.05 mm, indicating that the astigmatism of the optical imaging system 10 in this embodiment is small and the imaging quality is good.

[0182] The horizontal axis of the distortion curve represents the distortion rate, and the vertical axis represents the image height. Figure 6C The distortion curve given in shows that the distortion at a wavelength of 546.0740 nm is within ±2.5%, indicating that the distortion of the optical imaging system 10 in this embodiment is well corrected and the imaging quality is good.

[0183] As can be seen from FIG6 , the optical imaging system 10 provided in the second embodiment can achieve good imaging effects.

[0184] Example 3:

[0185] Please refer to Figure 7 To Figure 9, where Figure 8 for Figure 7 Schematic diagram of the structure of the optical imaging system 10 taken along the positive direction of the Y axis. In the optical imaging system 10 of this embodiment, from the object side to the image side, it includes a prism 11, an aperture 13, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and an infrared filter 15.

[0186] The first lens L1 has positive refractive power, with its object-side surface S11 being convex and its image-side surface S12 being convex, and both S11 and S12 being aspherical. The second lens L2 has negative refractive power, with its object-side surface S21 being convex and its image-side surface S22 being concave, and both S21 and S22 being aspherical. The third lens L3 has negative refractive power, with its object-side surface S31 being convex and its image-side surface S32 being concave, and both S31 and S32 being aspherical. The fourth lens L4 has positive refractive power, with its object-side surface S41 being convex and its image-side surface S42 being convex, with S41 being aspherical and S42 being spherical. The fifth lens L5 has negative refractive power, with its object-side surface S51 being concave and its image-side surface S52 being convex, with S51 being spherical and S52 being aspherical.

[0187] In the third embodiment, the aperture number fno of the optical imaging system 10 is 2.60, the field of view angle range FOV of the optical imaging system 10 is 26.25°, the total system length TTL of the optical imaging system 10 is 9.53 mm, and the focal length f of the optical imaging system 10 is 9.69 mm.

[0188] The distance between the object-side surface S11 of the first lens L1 and the image-side surface S52 of the fifth lens L5 on the optical axis L is TTL15 = 6.04 mm, the distance between the image-side surface S32 of the third lens L3 and the object-side surface S41 of the fourth lens L4 on the optical axis L is CT34 = 0.81 mm, the radius of curvature of the object-side surface of the third lens L3 at the optical axis L is R31 = 7.71 mm, the perpendicular distance SD31 of the maximum effective diameter of the object-side surface of the third lens L3 from the optical axis L is 1.42 mm, the perpendicular distance SD52 of the maximum effective diameter of the image-side surface of the fifth lens L5 from the optical axis L is 1.87 mm, the radius of curvature of the object-side surface of the fourth lens L4 at the optical axis L is R41 = 6.43 mm, and the focal length f4 of the fourth lens L4 is 6.7992 m m, the sag height SAG32 of the image-side surface S32 of the third lens L3 at the maximum effective diameter = 0.36 mm, the sag height SAG41 of the object-side surface S41 of the fourth lens L4 at the maximum effective diameter = 0.24 mm, the thickness ET1 of the first lens L1 at the maximum effective diameter = 1.17 mm, the thickness ET2 of the second lens L2 at the maximum effective diameter = 0.98 mm, the thickness ET3 of the third lens L3 at the maximum effective diameter = 0.73 mm, the thickness CT1 of the first lens L1 along the optical axis L = 1.86 mm, the thickness CT2 of the second lens L2 along the optical axis L = 0.73 mm, the thickness CT3 of the third lens L3 along the optical axis L = 0.50 mm, and the focal length f5 of the fifth lens L5 = -18.0350 mm.

[0189] The optical imaging system 10 also satisfies the conditions in the following table:

[0190] Table 5

[0191]

[0192]

[0193] Table 6

[0194]

[0195]

[0196] Figure 9A 、 Figure 9B 、 Figure 9C They are respectively the spherical aberration curve diagram, the astigmatism curve diagram and the distortion curve diagram in Example 3.

[0197] The horizontal axis of the spherical aberration curve represents the focus offset, and the vertical axis represents the normalized field of view. Figure 9A When the wavelengths given are 656.2725 nm, 587.5618 nm, 546.0740 nm, 486.1327 nm, and 435.8343 nm, respectively, the focus shifts of different fields of view are all within ±0.05 mm, indicating that the spherical aberration of the optical imaging system 10 in this embodiment is small and the imaging quality is good.

[0198] The horizontal axis of the astigmatism curve represents the focus shift, and the vertical axis represents the image height. Figure 9B The astigmatism curve given in shows that when the wavelength is 546.0740 nm, the focus shifts of the sagittal image plane and the meridional image plane are both within ±0.05 mm, indicating that the astigmatism of the optical imaging system 10 in this embodiment is small and the imaging quality is good.

[0199] The horizontal axis of the distortion curve represents the distortion rate, and the vertical axis represents the image height. Figure 9C The distortion curve given in shows that the distortion at a wavelength of 546.0740 nm is within ±2.5%, indicating that the distortion of the optical imaging system 10 in this embodiment is well corrected and the imaging quality is good.

[0200] As can be seen from FIG9 , the optical imaging system 10 provided in the third embodiment can achieve good imaging effects.

[0201] Example 4:

[0202] Please refer to Figure 10 to Figure 1 2, among which, Figure 11 for Figure 10 Schematic diagram of the structure of the optical imaging system 10 taken along the positive direction of the Y axis. In the optical imaging system 10 of this embodiment, from the object side to the image side, it includes a prism 11, an aperture 13, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and an infrared filter 15.

[0203] The first lens L1 has positive refractive power, with its object-side surface S11 being convex and its image-side surface S12 being convex, and both S11 and S12 being aspherical. The second lens L2 has negative refractive power, with its object-side surface S21 being convex and its image-side surface S22 being concave, and both S21 and S22 being aspherical. The third lens L3 has negative refractive power, with its object-side surface S31 being convex and its image-side surface S32 being concave, and both S31 and S32 being aspherical. The fourth lens L4 has positive refractive power, with its object-side surface S41 being convex and its image-side surface S42 being convex, with S41 being aspherical and S42 being spherical. The fifth lens L5 has negative refractive power, with its object-side surface S51 being concave and its image-side surface S52 being convex, with S51 being spherical and S52 being aspherical.

[0204] In the fourth embodiment, the aperture number fno of the optical imaging system 10 is 2.64, the field of view angle range FOV of the optical imaging system 10 is 28.59°, the total system length TTL of the optical imaging system 10 is 9.15 mm, and the focal length f of the optical imaging system 10 is 8.88 mm.

[0205] The distance between the object-side surface S11 of the first lens L1 and the image-side surface S52 of the fifth lens L5 on the optical axis L is TTL15 = 5.85 mm, the distance between the image-side surface S32 of the third lens L3 and the object-side surface S41 of the fourth lens L4 on the optical axis L is CT34 = 0.47 mm, the radius of curvature of the object-side surface of the third lens L3 at the optical axis L is R31 = 6.27 mm, the perpendicular distance SD31 of the maximum effective diameter of the object-side surface of the third lens L3 from the optical axis L is 1.41 mm, the perpendicular distance SD52 of the maximum effective diameter of the image-side surface of the fifth lens L5 from the optical axis L is 1.86 mm, the radius of curvature of the object-side surface of the fourth lens L4 at the optical axis L is R41 = 4.35 mm, and the focal length f4 of the fourth lens L4 is 5.1642 m m, the sag height SAG32 of the image-side surface S32 of the third lens L3 at the maximum effective diameter = 0.43 mm, the sag height SAG41 of the object-side surface S41 of the fourth lens L4 at the maximum effective diameter = 0.35 mm, the thickness ET1 of the first lens L1 at the maximum effective diameter = 1.20 mm, the thickness ET2 of the second lens L2 at the maximum effective diameter = 0.99 mm, the thickness ET3 of the third lens L3 at the maximum effective diameter = 0.87 mm, the thickness CT1 of the first lens L1 along the optical axis L = 1.81 mm, the thickness CT2 of the second lens L2 along the optical axis L = 0.72 mm, the thickness CT3 of the third lens L3 along the optical axis L = 0.60 mm, and the focal length f5 of the fifth lens L5 = -18.0447 mm.

[0206] The optical imaging system 10 also satisfies the conditions in the following table:

[0207] Table 7

[0208]

[0209] Table 8

[0210]

[0211]

[0212] Figure 12A 、 Figure 12B 、 Figure 12C They are respectively the spherical aberration curve diagram, the astigmatism curve diagram and the distortion curve diagram in the fourth embodiment.

[0213] The horizontal axis of the spherical aberration curve represents the focus offset, and the vertical axis represents the normalized field of view. Figure 12A When the wavelengths given are 656.2725 nm, 587.5618 nm, 546.0740 nm, 486.1327 nm, and 435.8343 nm, respectively, the focus shifts of different fields of view are all within ±0.05 mm, indicating that the spherical aberration of the optical imaging system 10 in this embodiment is small and the imaging quality is good.

[0214] The horizontal axis of the astigmatism curve represents the focus shift, and the vertical axis represents the image height. Figure 12B The astigmatism curve given in shows that when the wavelength is 546.0740 nm, the focus shifts of the sagittal image plane and the meridional image plane are both within ±0.05 mm, indicating that the astigmatism of the optical imaging system 10 in this embodiment is small and the imaging quality is good.

[0215] The horizontal axis of the distortion curve represents the distortion rate, and the vertical axis represents the image height. Figure 12C The distortion curve given in shows that the distortion at a wavelength of 546.0740 nm is within ±2.5%, indicating that the distortion of the optical imaging system 10 in this embodiment is well corrected and the imaging quality is good.

[0216] As can be seen from FIG12 , the optical imaging system 10 provided in the fourth embodiment can achieve good imaging effects.

[0217] Embodiment 5:

[0218] Please refer to Figure 13 to Figure 1 5, among which, Figure 14 for Figure 13 Schematic diagram of the structure of the optical imaging system 10 taken along the positive direction of the Y axis. In the optical imaging system 10 of this embodiment, from the object side to the image side, it includes a prism 11, an aperture 13, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and an infrared filter 15.

[0219] The first lens L1 has positive refractive power, with its object-side surface S11 being convex and its image-side surface S12 being convex, and both S11 and S12 being aspherical. The second lens L2 has negative refractive power, with its object-side surface S21 being convex and its image-side surface S22 being concave, and both S21 and S22 being aspherical. The third lens L3 has negative refractive power, with its object-side surface S31 being convex and its image-side surface S32 being concave, and both S31 and S32 being aspherical. The fourth lens L4 has positive refractive power, with its object-side surface S41 being convex and its image-side surface S42 being convex, with S41 being aspherical and S42 being spherical. The fifth lens L5 has negative refractive power, with its object-side surface S51 being concave and its image-side surface S52 being convex, with S51 being spherical and S52 being aspherical.

[0220] In the fifth embodiment, the aperture number fno of the optical imaging system 10 is 2.70, the field of view angle range FOV of the optical imaging system 10 is 30.70°, the total system length TTL of the optical imaging system 10 is 8.92 mm, and the focal length f of the optical imaging system 10 is 8.40 mm.

[0221] The distance between the object-side surface S11 of the first lens L1 and the image-side surface S52 of the fifth lens L5 on the optical axis L is TTL15 = 5.77 mm, the distance between the image-side surface S32 of the third lens L3 and the object-side surface S41 of the fourth lens L4 on the optical axis L is CT34 = 0.36 mm, the radius of curvature of the object-side surface of the third lens L3 at the optical axis L is R31 = 5.80 mm, the perpendicular distance SD31 of the maximum effective diameter of the object-side surface of the third lens L3 from the optical axis L is 1.40 mm, the perpendicular distance SD52 of the maximum effective diameter of the image-side surface of the fifth lens L5 from the optical axis L is 1.90 mm, the radius of curvature of the object-side surface of the fourth lens L4 at the optical axis L is R41 = 4.47 mm, and the focal length f4 of the fourth lens L4 is 4.897994 m m, the sag height SAG32 of the image-side surface S32 of the third lens L3 at the maximum effective diameter = 0.46 mm, the sag height SAG41 of the object-side surface S41 of the fourth lens L4 at the maximum effective diameter = 0.28 mm, the thickness ET1 of the first lens L1 at the maximum effective diameter = 1.21 mm, the thickness ET2 of the second lens L2 at the maximum effective diameter = 0.99 mm, the thickness ET3 of the third lens L3 at the maximum effective diameter = 0.90 mm, the thickness CT1 of the first lens L1 along the optical axis L = 1.76 mm, the thickness CT2 of the second lens L2 along the optical axis L = 0.72 mm, the thickness CT3 of the third lens L3 along the optical axis L = 0.62 mm, and the focal length f5 of the fifth lens L5 = -22.601257 mm.

[0222] The optical imaging system 10 also satisfies the conditions in the following table:

[0223] Table 9

[0224]

[0225]

[0226] Table 10

[0227]

[0228] Figure 15A 、 Figure 15B 、 Figure 15C They are respectively the spherical aberration curve diagram, the astigmatism curve diagram and the distortion curve diagram in Example 5.

[0229] The horizontal axis of the spherical aberration curve represents the focus offset, and the vertical axis represents the normalized field of view. Figure 15A When the wavelengths given are 656.2725 nm, 587.5618 nm, 546.0740 nm, 486.1327 nm, and 435.8343 nm, respectively, the focus shifts of different fields of view are all within ±0.05 mm, indicating that the spherical aberration of the optical imaging system 10 in this embodiment is small and the imaging quality is good.

[0230] The horizontal axis of the astigmatism curve represents the focus shift, and the vertical axis represents the image height. Figure 15B The astigmatism curve given in shows that when the wavelength is 546.0740 nm, the focus shifts of the sagittal image plane and the meridional image plane are both within ±0.10 mm, indicating that the astigmatism of the optical imaging system 10 in this embodiment is small and the imaging quality is good.

[0231] The horizontal axis of the distortion curve represents the distortion rate, and the vertical axis represents the image height. Figure 15C The distortion curve given in shows that the distortion at a wavelength of 546.0740 nm is within ±2.5%, indicating that the distortion of the optical imaging system 10 in this embodiment is well corrected and the imaging quality is good.

[0232] As can be seen from FIG15 , the optical imaging system 10 provided in the fifth embodiment can achieve good imaging effects.

[0233] Example 6:

[0234] Please refer to Figure 16 to Figure 1 8, among which, Figure 17 for Figure 16 Schematic diagram of the structure of the optical imaging system 10 taken along the positive direction of the Y axis. In the optical imaging system 10 of this embodiment, from the object side to the image side, it includes a prism 11, an aperture 13, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and an infrared filter 15.

[0235] The first lens L1 has positive refractive power, with its object-side surface S11 being convex and its image-side surface S12 being concave, with both S11 and S12 being aspherical. The second lens L2 has negative refractive power, with its object-side surface S21 being convex at the optical axis L and concave at the circumference of the second lens L2, and its image-side surface S22 being concave, with both S21 and S22 being aspherical. The third lens L3 has positive refractive power, with its object-side surface S31 being concave and its image-side surface S32 being convex, with both S31 and S32 being aspherical. The fourth lens L4 has positive refractive power, with its object-side surface S41 being concave at the optical axis L and convex at the circumference of the third lens L3, and its image-side surface S42 being convex, with S41 being aspherical and S42 being spherical. The fifth lens L5 has negative refractive power, its object-side surface S51 is concave, its image-side surface S52 is convex, S51 is a spherical surface, and S52 is an aspherical surface.

[0236] In the sixth embodiment, the aperture number fno of the optical imaging system 10 is 2.64, the field of view angle range FOV of the optical imaging system 10 is 24.98°, the total system length TTL of the optical imaging system 10 is 9.60 mm, and the focal length f of the optical imaging system 10 is 10.50 mm.

[0237] The distance between the object-side surface S11 of the first lens L1 and the image-side surface S52 of the fifth lens L5 on the optical axis L is TTL15 = 7.33 mm, the distance between the image-side surface S32 of the third lens L3 and the object-side surface S41 of the fourth lens L4 on the optical axis L is CT34 = 1.65 mm, the radius of curvature of the object-side surface of the third lens L3 at the optical axis L is R31 = -20.77 mm, the perpendicular distance SD31 of the maximum effective diameter of the object-side surface of the third lens L3 from the optical axis L is 1.43 mm, the perpendicular distance SD52 of the maximum effective diameter of the image-side surface of the fifth lens L5 from the optical axis L is 2.15 mm, the radius of curvature of the object-side surface of the fourth lens L4 at the optical axis L is R41 = -101.26 mm, and the focal length f4 of the fourth lens L4 is 23.8 The sag height SAG32 of the image-side surface S32 of the third lens L3 at the maximum effective diameter is 8mm, the sag height SAG32 of the image-side surface S32 at the maximum effective diameter is -0.12mm, the sag height SAG41 of the object-side surface S41 of the fourth lens L4 at the maximum effective diameter is 0.06mm, the thickness ET1 of the first lens L1 at the maximum effective diameter is 0.74mm, the thickness ET2 of the second lens L2 at the maximum effective diameter is 1.41mm, and the thickness ET3 of the third lens L3 at the maximum effective diameter is 0.60mm. The thickness CT1 of the first lens L1 along the optical axis L is 1.55mm, the thickness CT2 of the second lens L2 along the optical axis L is 1.04mm, and the thickness CT3 of the third lens L3 along the optical axis L is 0.65mm. The focal length f5 of the fifth lens L5 is -18.26mm.

[0238] The optical imaging system 10 also satisfies the conditions in the following table:

[0239] Table 11

[0240]

[0241] Table 12

[0242]

[0243]

[0244] Figure 18A 、 Figure 18B 、 Figure 18C They are respectively the spherical aberration curve diagram, the astigmatism curve diagram and the distortion curve diagram in Example 6.

[0245] The horizontal axis of the spherical aberration curve represents the focus offset, and the vertical axis represents the normalized field of view. Figure 18A When the wavelengths given are 656.2725 nm, 587.5618 nm, 546.0740 nm, 486.1327 nm, and 435.8343 nm, respectively, the focus shifts of different fields of view are all within ±0.05 mm, indicating that the spherical aberration of the optical imaging system 10 in this embodiment is small and the imaging quality is good.

[0246] The horizontal axis of the astigmatism curve represents the focus shift, and the vertical axis represents the image height. Figure 18B The astigmatism curve given in shows that when the wavelength is 546.0740 nm, the focus shifts of the sagittal image plane and the meridional image plane are both within ±0.05 mm, indicating that the astigmatism of the optical imaging system 10 in this embodiment is small and the imaging quality is good.

[0247] The horizontal axis of the distortion curve represents the distortion rate, and the vertical axis represents the image height. Figure 18C The distortion curve given in shows that the distortion at a wavelength of 546.0740 nm is within ±2.5%, indicating that the distortion of the optical imaging system 10 in this embodiment is well corrected and the imaging quality is good.

[0248] As can be seen from FIG18 , the optical imaging system 10 provided in the sixth embodiment can achieve good imaging effects.

[0249] Embodiment seven:

[0250] Please refer to Figure 19 to Figure 2 1, among which, Figure 20 for Figure 19 Schematic diagram of the structure of the optical imaging system 10 taken along the positive direction of the Y axis. In the optical imaging system 10 of this embodiment, from the object side to the image side, it includes a prism 11, an aperture 13, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and an infrared filter 15.

[0251] The first lens L1 has positive refractive power, with its object-side surface S11 being convex and its image-side surface S12 being concave, with both S11 and S12 being aspherical. The second lens L2 has negative refractive power, with its object-side surface S21 being convex at the optical axis L and concave at the circumference of the second lens L2, and its image-side surface S22 being concave, with both S21 and S22 being aspherical. The third lens L3 has positive refractive power, with its object-side surface S31 being concave and its image-side surface S32 being convex, with both S31 and S32 being aspherical. The fourth lens L4 has negative refractive power, with its object-side surface S41 being concave at the optical axis L and convex at the circumference of the third lens L3, and its image-side surface S42 being convex, with S41 being aspherical and S42 being spherical. The fifth lens L5 has negative refractive power, its object-side surface S51 is concave, its image-side surface S52 is convex, S51 is a spherical surface, and S52 is an aspherical surface.

[0252] In the seventh embodiment, the aperture number fno of the optical imaging system 10 is 2.64, the field of view angle range FOV of the optical imaging system 10 is 27.12°, the total system length TTL of the optical imaging system 10 is 8.91 mm, and the focal length f of the optical imaging system 10 is 9.58 mm.

[0253] The distance between the object-side surface S11 of the first lens L1 and the image-side surface S52 of the fifth lens L5 on the optical axis L is TTL15 = 7.68 mm, the distance between the image-side surface S32 of the third lens L3 and the object-side surface S41 of the fourth lens L4 on the optical axis L is CT34 = 0.50 mm, the radius of curvature of the object-side surface of the third lens L3 at the optical axis L is R31 = -6.39 mm, the perpendicular distance SD31 of the maximum effective diameter of the object-side surface of the third lens L3 from the optical axis L is 1.60 mm, the perpendicular distance SD52 of the maximum effective diameter of the image-side surface of the fifth lens L5 from the optical axis L is 2.22 mm, the radius of curvature of the object-side surface of the fourth lens L4 at the optical axis L is R41 = -7.82 mm, and the focal length f4 of the fourth lens L4 is -29.46 mm. mm, the sag height SAG32 of the image-side surface S32 of the third lens L3 at the maximum effective diameter = -0.54 mm, the sag height SAG41 of the object-side surface S41 of the fourth lens L4 at the maximum effective diameter = -0.09 mm, the thickness ET1 of the first lens L1 at the maximum effective diameter = 0.67 mm, the thickness ET2 of the second lens L2 at the maximum effective diameter = 1.25 mm, the thickness ET3 of the third lens L3 at the maximum effective diameter = 0.56 mm, the thickness CT1 of the first lens L1 along the optical axis L = 1.39 mm, the thickness CT2 of the second lens L2 along the optical axis L = 0.97 mm, the thickness CT3 of the third lens L3 along the optical axis L = 0.65 mm, and the focal length f5 of the fifth lens L5 = -18.32 mm.

[0254] The optical imaging system 10 also satisfies the conditions in the following table:

[0255] Table 13

[0256]

[0257]

[0258] Table 14

[0259]

[0260] Figure 21A 、 Figure 21B 、 Figure 21C They are respectively the spherical aberration curve diagram, the astigmatism curve diagram and the distortion curve diagram in Example 7.

[0261] The horizontal axis of the spherical aberration curve represents the focus offset, and the vertical axis represents the normalized field of view. Figure 21A When the wavelengths given are 656.2725 nm, 587.5618 nm, 546.0740 nm, 486.1327 nm, and 435.8343 nm, respectively, the focus shifts of different fields of view are all within ±0.05 mm, indicating that the spherical aberration of the optical imaging system 10 in this embodiment is small and the imaging quality is good.

[0262] The horizontal axis of the astigmatism curve represents the focus shift, and the vertical axis represents the image height. Figure 21B The astigmatism curve given in shows that when the wavelength is 546.0740 nm, the focus shifts of the sagittal image plane and the meridional image plane are both within ±0.05 mm, indicating that the astigmatism of the optical imaging system 10 in this embodiment is small and the imaging quality is good.

[0263] The horizontal axis of the distortion curve represents the distortion rate, and the vertical axis represents the image height. Figure 21C The distortion curve given in shows that the distortion at a wavelength of 546.0740 nm is within ±2.5%, indicating that the distortion of the optical imaging system 10 in this embodiment is well corrected and the imaging quality is good.

[0264] As can be seen from FIG. 21 , the optical imaging system 10 provided in the seventh embodiment can achieve good imaging effects.

[0265] Embodiment 8:

[0266] Please refer to Figure 22 to Figure 2 4, among which, Figure 23 for Figure 22 Schematic diagram of the structure of the optical imaging system 10 taken along the positive direction of the Y axis. In the optical imaging system 10 of this embodiment, from the object side to the image side, it includes a prism 11, an aperture 13, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and an infrared filter 15.

[0267] The first lens L1 has positive refractive power, with its object-side surface S11 being convex, and its image-side surface S12 being concave at the optical axis L and convex around the circumference of the first lens L1. Both S11 and S12 are aspherical surfaces. The second lens L2 has positive refractive power, with its object-side surface S21 being convex, and its image-side surface S22 being concave at the optical axis L and convex around the circumference of the second lens L2. Both S21 and S22 are aspherical surfaces. The third lens L3 has negative refractive power, with its object-side surface S31 being concave, and its image-side surface S32 being convex at the optical axis L and concave around the circumference of the third lens L3. Both S31 and S32 are aspherical surfaces. The fourth lens L4 has negative refractive power, with its object-side surface S41 being concave, and its image-side surface S42 being convex. S41 is aspherical, and S42 is spherical. The fifth lens L5 has negative refractive power, its object-side surface S51 is concave, its image-side surface S52 is convex, S51 is a spherical surface, and S52 is an aspherical surface.

[0268] In the eighth embodiment, the aperture number fno of the optical imaging system 10 is 2.64, the field of view angle range FOV of the optical imaging system 10 is 28.20°, the total system length TTL of the optical imaging system 10 is 8.80 mm, and the focal length f of the optical imaging system 10 is 9.00 mm.

[0269] The distance between the object-side surface S11 of the first lens L1 and the image-side surface S52 of the fifth lens L5 on the optical axis L is TTL15 = 5.68 mm, the distance between the image-side surface S32 of the third lens L3 and the object-side surface S41 of the fourth lens L4 on the optical axis L is CT34 = 0.32 mm, the radius of curvature of the object-side surface of the third lens L3 at the optical axis L is R31 = -3.50 mm, the perpendicular distance SD31 of the maximum effective diameter of the object-side surface of the third lens L3 from the optical axis L is 1.63 mm, the perpendicular distance SD52 of the maximum effective diameter of the image-side surface of the fifth lens L5 from the optical axis L is 1.80 mm, the radius of curvature of the object-side surface of the fourth lens L4 at the optical axis L is R41 = -12.24 mm, and the focal length f4 of the fourth lens L4 is -338.1 mm. The sag height SAG32 of the image-side surface S32 of the third lens L3 at the maximum effective diameter is 4mm, the sag height SAG32 of the image-side surface S32 at the maximum effective diameter is 0.02mm, the sag height SAG41 of the object-side surface S41 of the fourth lens L4 at the maximum effective diameter is -0.20mm, the thickness ET1 of the first lens L1 at the maximum effective diameter is 0.40mm, the thickness ET2 of the second lens L2 at the maximum effective diameter is 0.31mm, and the thickness ET3 of the third lens L3 at the maximum effective diameter is 1.01mm. The thickness CT1 of the first lens L1 along the optical axis L is 1.14mm, the thickness CT2 of the second lens L2 along the optical axis L is 0.43mm, and the thickness CT3 of the third lens L3 along the optical axis L is 0.72mm. The focal length f5 of the fifth lens L5 is -18.32mm.

[0270] The optical imaging system 10 also satisfies the conditions in the following table:

[0271] Table 15

[0272]

[0273]

[0274] Table 16

[0275]

[0276]

[0277] Figure 24A 、 Figure 24B 、 Figure 24C They are respectively the spherical aberration curve diagram, the astigmatism curve diagram and the distortion curve diagram in Example 8.

[0278] The horizontal axis of the spherical aberration curve represents the focus offset, and the vertical axis represents the normalized field of view. Figure 24A When the wavelengths given are 656.2725 nm, 587.5618 nm, 546.0740 nm, 486.1327 nm, and 435.8343 nm, respectively, the focus shifts of different fields of view are all within ±0.20 mm, indicating that the spherical aberration of the optical imaging system 10 in this embodiment is small and the imaging quality is good.

[0279] The horizontal axis of the astigmatism curve represents the focus shift, and the vertical axis represents the image height. Figure 24B The astigmatism curve given in shows that when the wavelength is 546.0740 nm, the focus shifts of the sagittal image plane and the meridional image plane are both within ±0.05 mm, indicating that the astigmatism of the optical imaging system 10 in this embodiment is small and the imaging quality is good.

[0280] The horizontal axis of the distortion curve represents the distortion rate, and the vertical axis represents the image height. Figure 24C The distortion curve given in shows that the distortion at a wavelength of 546.0740 nm is within ±2.5%, indicating that the distortion of the optical imaging system 10 in this embodiment is well corrected and the imaging quality is good.

[0281] According to FIG. 24 , it can be seen that the optical imaging system 10 provided in the eighth embodiment can achieve good imaging effects.

[0282] Embodiment 9:

[0283] Please refer to Figure 25 to Figure 2 7, among which, Figure 26 for Figure 25Schematic diagram of the structure of the optical imaging system 10 taken along the positive direction of the Y axis. In the optical imaging system 10 of this embodiment, from the object side to the image side, it includes a prism 11, an aperture 13, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and an infrared filter 15.

[0284] The first lens L1 has positive refractive power, with its object-side surface S11 being convex, and its image-side surface S12 being concave at the optical axis L and convex around the circumference of the first lens L1. Both S11 and S12 are aspherical surfaces. The second lens L2 has negative refractive power, with its object-side surface S21 being convex, and its image-side surface S22 being concave at the optical axis L and convex around the circumference of the second lens L2. Both S21 and S22 are aspherical surfaces. The third lens L3 has negative refractive power, with its object-side surface S31 being concave at the optical axis L and convex around the circumference of the third lens L3. Its image-side surface S32 is convex at the optical axis L and concave around the circumference of the third lens L3. Both S31 and S32 are aspherical surfaces. The fourth lens L4 has negative refractive power, with its object-side surface S41 being concave and its image-side surface S42 being convex. S41 is aspherical, while S42 is spherical. The fifth lens L5 has negative refractive power, with its object-side surface S51 being concave and its image-side surface S52 being convex. S51 is spherical, while S52 is aspherical.

[0285] In the ninth embodiment, the aperture number fno of the optical imaging system 10 is 2.64, the field of view angle range FOV of the optical imaging system 10 is 27.78°, the total system length TTL of the optical imaging system 10 is 8.50 mm, and the focal length f of the optical imaging system 10 is 9.00 mm.

[0286] The distance between the object-side surface S11 of the first lens L1 and the image-side surface S52 of the fifth lens L5 on the optical axis L is TTL15 = 4.33 mm, the distance between the image-side surface S32 of the third lens L3 and the object-side surface S41 of the fourth lens L4 on the optical axis L is CT34 = 0.34 mm, the radius of curvature of the object-side surface of the third lens L3 at the optical axis L is R31 = -4.20 mm, the perpendicular distance SD31 of the maximum effective diameter of the object-side surface of the third lens L3 from the optical axis L is 1.51 mm, the perpendicular distance SD52 of the maximum effective diameter of the image-side surface of the fifth lens L5 from the optical axis L is 1.52 mm, the radius of curvature of the object-side surface of the fourth lens L4 at the optical axis L is R41 = -5.11 mm, and the focal length f4 of the fourth lens L4 is -15.44 mm. mm, the sag height SAG32 of the image-side surface S32 of the third lens L3 at the maximum effective diameter = 0.00 mm, the sag height SAG41 of the object-side surface S41 of the fourth lens L4 at the maximum effective diameter = -0.25 mm, the thickness ET1 of the first lens L1 at the maximum effective diameter = 0.41 mm, the thickness ET2 of the second lens L2 at the maximum effective diameter = 0.50 mm, the thickness ET3 of the third lens L3 at the maximum effective diameter = 0.78 mm, the thickness CT1 of the first lens L1 along the optical axis L = 1.20 mm, the thickness CT2 of the second lens L2 along the optical axis L = 0.52 mm, the thickness CT3 of the third lens L3 along the optical axis L = 0.60 mm, and the focal length f5 of the fifth lens L5 = -18.38 mm.

[0287] The optical imaging system 10 also satisfies the conditions in the following table:

[0288] Table 17

[0289]

[0290] Table 18

[0291]

[0292]

[0293] Figure 27A 、 Figure 27B 、 Figure 27C They are respectively the spherical aberration curve diagram, the astigmatism curve diagram and the distortion curve diagram in Example 9.

[0294] The horizontal axis of the spherical aberration curve represents the focus offset, and the vertical axis represents the normalized field of view. Figure 27A When the wavelengths given are 656.2725 nm, 587.5618 nm, 546.0740 nm, 486.1327 nm, and 435.8343 nm, respectively, the focus shifts of different fields of view are all within ±0.10 mm, indicating that the spherical aberration of the optical imaging system 10 in this embodiment is small and the imaging quality is good.

[0295] The horizontal axis of the astigmatism curve represents the focus shift, and the vertical axis represents the image height. Figure 27B The astigmatism curve given in shows that when the wavelength is 546.0740 nm, the focus shifts of the sagittal image plane and the meridional image plane are both within ±0.05 mm, indicating that the astigmatism of the optical imaging system 10 in this embodiment is small and the imaging quality is good.

[0296] The horizontal axis of the distortion curve represents the distortion rate, and the vertical axis represents the image height. Figure 27C The distortion curve given in shows that the distortion at a wavelength of 546.0740 nm is within ±5.0%, indicating that the distortion of the optical imaging system 10 in this embodiment is well corrected and the imaging quality is good.

[0297] As can be seen from FIG27 , the optical imaging system 10 provided in the ninth embodiment can achieve good imaging effects.

[0298] Embodiment 10:

[0299] Please refer to Figure 28 To Figure 30, where Figure 29 for Figure 28 Schematic diagram of the structure of the optical imaging system 10 taken along the positive direction of the Y axis. In the optical imaging system 10 of this embodiment, from the object side to the image side, it includes a prism 11, an aperture 13, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and an infrared filter 15.

[0300] The first lens L1 has positive refractive power, with its object-side surface S11 being convex at the optical axis L and concave around the circumference of the first lens L1. Its image-side surface S12 is convex, and both S11 and S12 are aspherical. The second lens L2 has negative refractive power, with its object-side surface S21 being concave and its image-side surface S22 being concave at the optical axis L and convex around the circumference of the second lens L2. Both S21 and S22 are aspherical. The third lens L3 has positive refractive power, with its object-side surface S31 being convex and its image-side surface S32 being convex at the optical axis L and concave around the circumference of the third lens L3. Both S31 and S32 are aspherical. The fourth lens L4 has negative refractive power, with its object-side surface S41 being concave and its image-side surface S42 being convex. S41 is aspherical and S42 is spherical. The fifth lens L5 has negative refractive power, its object-side surface S51 is concave, its image-side surface S52 is convex, S51 is a spherical surface, and S52 is an aspherical surface.

[0301] In the tenth embodiment, the aperture number fno of the optical imaging system 10 is 2.64, the field of view angle range FOV of the optical imaging system 10 is 27.82°, the total system length TTL of the optical imaging system 10 is 9.00 mm, and the focal length f of the optical imaging system 10 is 9.00 mm.

[0302] The distance between the object-side surface S11 of the first lens L1 and the image-side surface S52 of the fifth lens L5 on the optical axis L is TTL15 = 7.87 mm, the distance between the image-side surface S32 of the third lens L3 and the object-side surface S41 of the fourth lens L4 on the optical axis L is CT34 = 2.36 mm, the radius of curvature of the object-side surface of the third lens L3 at the optical axis L is R31 = 19.73 mm, the perpendicular distance SD31 of the maximum effective diameter of the object-side surface of the third lens L3 from the optical axis L is 1.57 mm, the perpendicular distance SD52 of the maximum effective diameter of the image-side surface of the fifth lens L5 from the optical axis L is 2.03 mm, the radius of curvature of the object-side surface of the fourth lens L4 at the optical axis L is R41 = -3.97 mm, and the focal length f4 of the fourth lens L4 is -10.54 mm. mm, the sag height SAG32 of the image-side surface S32 of the third lens L3 at the maximum effective diameter = 0.11 mm, the sag height SAG41 of the object-side surface S41 of the fourth lens L4 at the maximum effective diameter = -0.37 mm, the thickness ET1 of the first lens L1 at the maximum effective diameter = 0.60 mm, the thickness ET2 of the second lens L2 at the maximum effective diameter = 0.67 mm, the thickness ET3 of the third lens L3 at the maximum effective diameter = 0.57 mm, the thickness CT1 of the first lens L1 along the optical axis L = 1.17 mm, the thickness CT2 of the second lens L2 along the optical axis L = 0.50 mm, the thickness CT3 of the third lens L3 along the optical axis L = 0.62 mm, and the focal length f5 of the fifth lens L5 = -18.38 mm.

[0303] The optical imaging system 10 also satisfies the conditions in the following table:

[0304] Table 19

[0305]

[0306]

[0307] Table 20

[0308]

[0309] Figure 30A 、 Figure 30B 、 Figure 30C They are respectively the spherical aberration curve diagram, the astigmatism curve diagram and the distortion curve diagram in Example 10.

[0310] The horizontal axis of the spherical aberration curve represents the focus offset, and the vertical axis represents the normalized field of view. Figure 30AWhen the wavelengths given in are 656.2725 nm, 587.5618 nm, 546.0740 nm, 486.1327 nm, and 435.8343 nm, respectively, and the vertical coordinate range is [0, 0.75], the focus offsets of different fields of view are all within ±0.05 mm, indicating that the optical imaging system 10 in this embodiment has a certain improvement effect on spherical aberration and imaging quality.

[0311] The horizontal axis of the astigmatism curve represents the focus shift, and the vertical axis represents the image height. Figure 30B The astigmatism curve given in shows that when the wavelength is 546.0740 nm, the focus shifts of the sagittal image plane and the meridional image plane are both within ±0.05 mm, indicating that the astigmatism of the optical imaging system 10 in this embodiment is small and the imaging quality is good.

[0312] The horizontal axis of the distortion curve represents the distortion rate, and the vertical axis represents the image height. Figure 30C The distortion curve given in shows that the distortion at a wavelength of 546.0740 nm is within ±5.0%, indicating that the distortion of the optical imaging system 10 in this embodiment is well corrected and the imaging quality is good.

[0313] As can be seen from FIG30 , the optical imaging system 10 provided in the tenth embodiment can achieve good imaging effects.

[0314] In addition, the optical imaging system 10 in Examples 1 to 10 also satisfies the conditions in the following table:

[0315] Table 21

[0316]

[0317] Please refer to Figure 31 An embodiment of the present invention provides a camera module 110, comprising a photosensitive element 111 and the optical imaging system 10 of any of the above-described embodiments. The photosensitive element 111 is mounted on the image side of the optical imaging system 10. The photosensitive element 111 is configured to convert light signals that pass through the optical imaging system 10 and reach the image side into electrical signals.

[0318] The camera module 110 mentioned above improves image quality and has good workability by balancing the size of the periscope module, maintaining a sufficient telephoto focal length, reducing the complexity of the surface shape, and reasonably distributing the refractive power of the lens.

[0319] It is understood that after passing through the optical imaging system 10, the light signal changes its optical path transmission direction, thereby forming a high-quality image on the image side of the optical imaging system 10. The photosensitive element 111 can process the light signal on the image side into a corresponding electrical signal, which can be transmitted to the electronic display screen, so that the image formed by the light signal on the image side can be displayed on the electronic display screen. In one embodiment, the photosensitive element 111 includes a photosensor and an analog-to-digital converter. The photosensor is used to convert the light signal into an analog signal, and the analog-to-digital converter is used to convert the analog signal output by the photosensor into a digital signal.

[0320] In addition, it can be understood that when the optical imaging system 10 has a prism 11, by adjusting the orientation of the prism 11 relative to the lens group, the optical imaging system 10 can receive light signals in different orientations, thereby increasing the object side range of the optical imaging system 10 without changing the orientation of the overall structure of the optical imaging system 10.

[0321] An electronic device 20 provided in an embodiment of the present invention includes a housing 21 and the camera module 110 of the above embodiment. The camera module 110 is installed in the housing 21.

[0322] The electronic device 20 provides a large aperture and effective imaging circle diameter by balancing the periscope module size, FNO, image plane size and optical system volume, maintains a sufficient telephoto focal length, reduces surface complexity, and reasonably distributes the refractive power of the lens, thereby improving image quality and having good processability.

[0323] The electronic device 20 of the embodiment of the present invention includes but is not limited to information terminal devices such as cameras, driving recorders, smart phones, personal digital assistants (PDAs), tablet computers, personal computers (PCs), smart wearable devices, or electronic devices with camera functions.

[0324] Specifically, in Figure 32 In the illustrated embodiment, the electronic device 20 is a smartphone, and the camera module 110 is a front camera of the electronic device 20. It is understood that in other embodiments, the camera module 110 can be disposed at any location on the electronic device 20 to achieve the effect of the camera module 110 for shooting in the aforementioned embodiment.

[0325] In addition, Figure 33In the illustrated embodiment, the electronic device 20 may be used in the vehicle 100. Specifically, the electronic device 20 may be a front camera of the vehicle 100, a camera in the ADAS (Advanced Driver Assistant System) of the vehicle 100, a driving recorder of the vehicle 100, or a surveillance security camera of the vehicle 100. The number of electronic devices 20 may be one, two, or more than two.

[0326] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "certain embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that a specific feature, structure, material, or characteristic described in conjunction with an embodiment or example is included in at least one embodiment or example of the present invention. In this specification, illustrative expressions 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.

[0327] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. An optical imaging system, characterized in that: There are five lenses with refractive power, arranged in order from the object side to the image side along the optical axis. The optical imaging system includes: a first lens having positive refractive power, wherein the object-side surface of the first lens is convex near the optical axis; a second lens having refractive power, wherein the object-side surface of the second lens is convex near the optical axis, and the image-side surface of the second lens is concave near the optical axis; a third lens having refractive power, wherein the object-side surface of the third lens is aspherical, and the image-side surface of the third lens is aspherical; a fourth lens having refractive power, wherein the image side surface of the fourth lens is convex near the optical axis, the image side surface of the fourth lens is convex at the circumference, the object side surface of the fourth lens is aspherical, and the image side surface of the fourth lens is spherical; and a fifth lens having negative refractive power, wherein the object-side surface of the fifth lens is concave near the optical axis, the image-side surface of the fifth lens is convex near the optical axis, the object-side surface of the fifth lens is spherical, and the image-side surface of the fifth lens is aspherical; The optical imaging system further includes a prism, wherein the prism is arranged on the object side of the first lens; The optical imaging system satisfies the following relationship: 1.432≤f / TTL15<2.1; 0.66<SD31 / SD52<1.0; 0.014≤|SAG32| / |SAG41|≤2.044; 0.7<(ET1+ET2+ET3) / (CT1+CT2+CT3)<1.1; Wherein, f represents the focal length of the optical imaging system, TTL15 represents the distance between the object-side surface of the first lens and the image-side surface of the fifth lens on the optical axis, SD31 represents the perpendicular distance between the maximum effective diameter of the object-side surface of the third lens and the optical axis, SD52 represents the perpendicular distance between the maximum effective diameter of the image-side surface of the fifth lens and the optical axis, SAG32 represents the sag height at the maximum effective diameter of the image-side surface of the third lens, SAG41 represents the sag height at the maximum effective diameter of the object-side surface of the fourth lens, ET1 represents the distance from the maximum effective diameter of the object-side surface of the first lens to the maximum effective diameter of the image-side surface in the direction of the optical axis, ET2 represents the distance from the maximum effective diameter of the object-side surface of the second lens to the maximum effective diameter of the image-side surface in the direction of the optical axis, ET3 represents the distance from the maximum effective diameter of the object-side surface of the third lens to the maximum effective diameter of the image-side surface in the direction of the optical axis, CT1 represents the thickness of the first lens on the optical axis, CT2 represents the thickness of the second lens on the optical axis, and CT3 represents the thickness of the third lens on the optical axis, and By using a 43mm frame lens equivalent, the equivalent focal length of the optical imaging system 10 can reach 78.5-98.2mm.

2. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following relationship: 8.4mm≤f≤10.5mm.

3. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following relationship: 4.33mm≤TTL15≤7.87mm.

4. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following relationship: 0.061≤CT34 / |R31|<0.22; Wherein, CT34 represents the distance between the image side surface of the third lens and the object side surface of the fourth lens on the optical axis, and R31 represents the curvature radius of the object side surface of the third lens at the optical axis.

5. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following relationship: 0.331≤|R41| / |f4|<4.3; Wherein, R41 represents the curvature radius of the object side of the fourth lens at the optical axis, and f4 represents the focal length of the fourth lens.

6. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following relationship: 0.958≤ET2 / CT2<1.4; Wherein, ET2 represents the distance from the maximum effective diameter of the object side surface of the second lens to the maximum effective diameter of the image side surface in the direction of the optical axis, and CT2 represents the thickness of the second lens on the optical axis.

7. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following relationship: 0.416≤(|f4|+|f5|) / |R41|≤6.617; Wherein, f4 represents the focal length of the fourth lens, f5 represents the focal length of the fifth lens, and R41 represents the curvature radius of the object side of the fourth lens at the optical axis.

8. A camera module, characterized in that: The camera module includes: Photosensitive element; and The optical imaging system according to any one of claims 1 to 7, wherein the photosensitive element is installed on the image side of the optical imaging system, and the photosensitive element is used to convert the light signal that passes through the optical imaging system and reaches the image side into an electrical signal.

9. An electronic device, characterized in that: The electronic device comprises: housing; and The camera module described in claim 8 is installed in the shell.

Images