Optical imaging system, imaging device and electronic device

Abstract

The present application discloses an optical imaging system, which includes, in order from the object side to the image side along the optical axis, a first lens, a second lens, a third lens, a fourth lens, and a fifth lens. The first lens has positive focal power, and its object-side surface is convex at the optical axis; the second lens has focal power, and its image-side surface is convex at the optical axis; the third lens has focal power; the fourth lens has positive focal power, and its image-side surface is convex at the optical axis; the fifth lens has negative focal power, and its object-side surface is convex at the optical axis, and its image-side surface is concave at the optical axis; at least one of the object-side and image-side surfaces of the fifth lens includes at least one inflection point; an aperture is provided between the object side and the fifth lens; and the maximum effective semi-aperture SD11 of the object-side surface of the first lens and the maximum effective semi-aperture SD12 of the image-side surface of the first lens satisfy SD11 / SD12 < 1.1; the maximum field of view (FOV) of the optical imaging system satisfies 80°≤FOV≤120°. The present application also relates to an imaging device and an electronic device.

Description

Technical Field

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

[0002] In recent years, with the development of science and technology, portable electronic products with camera functions have become more and more popular. Among them, wide-angle lenses have a larger shooting field of view and can capture large scenes or panoramic photos within a limited distance, which can better meet user needs.

[0003] However, with the advancement of CMOS chip technology, the pixel size of the chip is getting smaller and smaller, and the image quality requirements of the corresponding optical imaging system are becoming increasingly higher. To ensure image quality, traditional wide-angle lenses are usually made with a relatively large lens head while expanding the viewing angle, which makes it difficult to meet the application requirements of lightweight and miniaturized electronic products. Summary of the Invention

[0004] Based on this, it is necessary to provide an improved optical imaging system to address the problem that the traditional wide-angle lens has a large lens head while ensuring imaging quality.

[0005] An optical imaging system comprises, in order from the object side to the image side along the optical axis: a first lens, a second lens, a third lens, a fourth lens, and a fifth lens, wherein the first lens has positive focal power, and its object-side surface is convex at the optical axis; the second lens has focal power, and its image-side surface is convex at the optical axis; the third lens has focal power; the fourth lens has positive focal power, and its image-side surface is convex at the optical axis; the fifth lens has negative focal power, and its object-side surface is convex at the optical axis, and its image-side surface is concave at the optical axis; at least one of the object-side surface and the image-side surface of the fifth lens includes at least one inflection point; an aperture is provided between the object side of the optical imaging system and the fifth lens; and the optical imaging system satisfies the following relationship:

[0006] SD11 / SD12<1.1;

[0007] 80°≤FOV≤120°;

[0008] Among them, SD11 is the maximum effective semi-aperture of the object side of the first lens, SD12 is the maximum effective semi-aperture of the image side of the first lens, and FOV is the maximum field of view of the optical imaging system.

[0009] The above-mentioned optical imaging system optimizes the aperture, curvature, and shape of the first lens while ensuring a large field of view, thereby reducing the aperture of the first lens. This reduces the head size of the optical imaging system and provides better processing performance, thereby better meeting the application requirements of thin and light electronic devices. At the same time, by rationally allocating the optical power, surface shape, and spacing between each lens, the aberration of the optical imaging system can be reduced, thereby ensuring the imaging quality of the optical imaging system.

[0010] In one embodiment, the aperture is disposed between the object side of the optical imaging system and the first lens.

[0011] By placing the aperture in front, the excessive increase of the incident angle of the main light can be effectively suppressed, so that the optical imaging system can be better matched with the photosensitive chip.

[0012] In one embodiment, the optical imaging system satisfies the following relationship: θ<20°; wherein θ is the angle between the tangent line of the vertex of the maximum effective aperture of the object side of the first lens and the normal line of the optical axis.

[0013] By lowering the angle between the tangent line of the maximum effective aperture vertex on the object side of the first lens and the normal line of the optical axis, the processing of the first lens can be facilitated while ensuring that the optical imaging system achieves a wide angle, which is beneficial to the assembly and mass production of lenses.

[0014] In one embodiment, the optical imaging system satisfies the following relationship: SD11 / SD52<0.4; wherein SD11 is the maximum effective semi-aperture of the object side of the first lens, and SD52 is the maximum effective semi-aperture of the image side of the fifth lens.

[0015] By optimizing the aperture size of the object side of the first lens, it is beneficial to achieve miniaturization of the optical imaging system and meet the small head design of the lens.

[0016] In one embodiment, the optical imaging system satisfies the following relationship: SD11 / ImgH≤0.27; wherein SD11 is the maximum effective semi-aperture of the object side of the first lens, and ImgH is half of the diagonal length of the effective pixel area on the imaging surface of the optical imaging system.

[0017] By controlling the maximum effective semi-aperture of the object side of the first lens and half of the diagonal length of the effective pixel area on the imaging surface of the optical imaging system to satisfy the above relationship, the lens with the optical imaging system can have a smaller head aperture when paired with a photosensitive chip of the same size, which is conducive to miniaturization of the lens and better meets the application requirements of thin and light electronic devices.

[0018] In one embodiment, the optical imaging system satisfies the following relationship: 0.3<R1 / f1<0.8; wherein R1 is the radius of curvature of the object side of the first lens at the optical axis, and f1 is the effective focal length of the first lens.

[0019] By controlling the curvature radius of the object side of the first lens at the optical axis and the effective focal length of the first lens to satisfy the above relationship, the first lens can be configured with sufficient positive optical power, thereby helping light to be better incident on the optical imaging system; at the same time, it is also beneficial to ensure good imaging quality while shortening the overall length of the optical imaging system.

[0020] In one embodiment, the optical imaging system satisfies the following relationship: f5 / f<-0.5; wherein f5 is the effective focal length of the fifth lens, and f is the effective focal length of the optical imaging system.

[0021] By controlling the effective focal length of the fifth lens and the effective focal length of the optical imaging system to satisfy the above relationship, it is beneficial to correct the aberration and field curvature of the optical imaging system, so that the system can maintain better optical performance.

[0022] In one embodiment, the optical imaging system satisfies the following relationship: ImgH / TTL≥0.6; wherein ImgH is half of the diagonal length of the effective pixel area on the imaging plane of the optical imaging system, and TTL is the distance from the object side of the first lens to the imaging plane of the optical imaging system on the optical axis.

[0023] By controlling the above relationship between half of the diagonal length of the effective pixel area on the imaging plane of the optical imaging system and the distance from the object side of the first lens to the imaging plane of the optical imaging system on the optical axis, it is beneficial to shorten the total length of the optical imaging system and achieve miniaturization of the lens.

[0024] In one embodiment, the optical imaging system satisfies the following relationship: -1<R5 / R6<1.4; wherein R5 is the curvature radius of the object side of the third lens at the optical axis, and R6 is the curvature radius of the image side of the third lens at the optical axis.

[0025] The third lens has positive or negative optical power. By optimizing the curvature radius of the object side and the image side of the third lens, it is beneficial to reduce the aberration of the optical imaging system and improve the resolving power of the lens.

[0026] In one embodiment, the optical imaging system satisfies the following relationship: 0.3<V2 / V1≤1; wherein V1 is the dispersion coefficient of the first lens, and V2 is the dispersion coefficient of the second lens.

[0027] By controlling the dispersion coefficient of the first lens and the dispersion coefficient of the second lens to satisfy the above relationship, it is beneficial to reduce system chromatic aberration and improve the imaging quality of the optical imaging system.

[0028] In one embodiment, the optical imaging system satisfies the following relationship: CT1 / OAL<0.21; wherein CT1 is the thickness of the first lens on the optical axis, and OAL is the distance from the object side surface of the first lens to the image side surface of the fifth lens on the optical axis.

[0029] By controlling the thickness of the first lens on the optical axis and the distance from the object side of the first lens to the image side of the fifth lens on the optical axis to satisfy the above relationship, the thickness of the first lens on the optical axis can be prevented from being too large, thereby facilitating shortening the overall length of the optical imaging system and meeting the application requirements of thin and light electronic devices.

[0030] In one embodiment, the optical imaging system satisfies the following relationship:

[0031] 0.7≤tan(FOV / 2) / EPD<1.6; wherein FOV is the maximum field of view of the optical imaging system, and EPD is the entrance pupil diameter of the optical imaging system.

[0032] By controlling the maximum field of view angle of the optical imaging system and the entrance pupil diameter of the optical imaging system to satisfy the above relationship, the field of view angle of the optical imaging system can be effectively increased, thereby better satisfying the user experience.

[0033] The present application also provides an imaging device.

[0034] An imaging device comprises the optical imaging system as described above; and a photosensitive element, wherein the photosensitive element is arranged on the image side of the optical imaging system.

[0035] The above-mentioned imaging device can capture wide-angle images with small aberration and high resolution using the aforementioned optical imaging system. At the same time, the imaging device is also miniaturized, making it easy to adapt to devices with limited size, such as thin and light electronic devices.

[0036] The present application also provides an electronic device, comprising a housing; and the imaging device as described above, wherein the imaging device is mounted on the housing.

[0037] The above-mentioned electronic device has a light and thin structure. Using the imaging device as described above, it can capture images with a wide angle and good imaging quality, meeting the shooting requirements of cameras of equipment such as mobile phones, vehicles, monitoring, and medical devices. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1Schematic diagram of the structure of the optical imaging system of Example 1 of the present application is shown;

[0039] Figures 2A to 2C They are respectively a longitudinal spherical aberration curve diagram, an astigmatism curve diagram, and a distortion curve diagram of the optical imaging system of Example 1;

[0040] Figure 3 Schematic diagram of the structure of the optical imaging system of Example 2 of the present application is shown;

[0041] Figures 4A to 4C They are respectively a longitudinal spherical aberration curve diagram, an astigmatism curve diagram, and a distortion curve diagram of the optical imaging system of Example 2;

[0042] Figure 5 A schematic structural diagram of an optical imaging system according to Example 3 of the present application is shown;

[0043] Figures 6A to 6C They are respectively a longitudinal spherical aberration curve diagram, an astigmatism curve diagram, and a distortion curve diagram of the optical imaging system of Example 3;

[0044] Figure 7 A schematic structural diagram of an optical imaging system according to Example 4 of the present application is shown;

[0045] Figures 8A to 8C They are respectively a longitudinal spherical aberration curve diagram, an astigmatism curve diagram, and a distortion curve diagram of the optical imaging system of Example 4;

[0046] Figure 9 Schematic diagram of the structure of the optical imaging system of Example 5 of the present application is shown;

[0047] Figures 10A to 10C They are respectively a longitudinal spherical aberration curve diagram, an astigmatism curve diagram, and a distortion curve diagram of the optical imaging system of Example 5;

[0048] Figure 11 Schematic diagram of the structure of the optical imaging system of Example 6 of the present application is shown;

[0049] 12A to 12C They are respectively the longitudinal spherical aberration curve diagram, the astigmatism curve diagram and the distortion curve diagram of the optical imaging system of Example 6. DETAILED DESCRIPTION

[0050] To facilitate understanding of the present invention, the present invention will be described more fully below with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the accompanying drawings. However, the present invention may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to provide a more thorough and comprehensive understanding of the present disclosure.

[0051] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may also be an element centered thereon. When an element is considered to be "connected" to another element, it may be directly connected to the other element or there may be an element centered thereon at the same time. The terms "vertical", "horizontal", "left", "right", "up", "down", "front", "rear", "circumferential" and similar expressions used herein are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0052] It should be noted that in this specification, the terms "first," "second," "third," etc., are used solely to distinguish one feature from another and do not limit the features. Thus, the first lens discussed below could also be referred to as the second lens or the third lens without departing from the teachings of this application.

[0053] For ease of explanation, the shapes of spherical or aspherical surfaces shown in the drawings are shown by way of example. That is, the shapes of spherical or aspherical surfaces are not limited to those shown in the drawings. The drawings are for illustration only and are not drawn strictly to scale.

[0054] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this invention pertains. The terms used in this specification of the present invention are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0055] In order to ensure a wide viewing angle and image quality, the aperture of the first lens of a traditional wide-angle lens is usually relatively large, which makes it difficult to meet the application requirements of thin and light electronic products. In addition, the edge shape of the first lens of a traditional wide-angle lens is also highly curved, so the mass production molding process of the lens is not advanced.

[0056] The defects in the above solutions are the results obtained by the inventor after practice and careful research. Therefore, the process of discovering the above problems and the solutions proposed in the embodiments of this application below should be the contributions made by the inventor to this application during the application process.

[0057] The features, principles and other aspects of the present application will be described in detail below.

[0058] Please also refer to Figure 1 、 Figure 3 、 Figure 5 、 Figure 7 、 Figure 9 and Figure 11 The optical imaging system of the embodiment of the present application includes five lenses having optical power, namely a first lens, a second lens, a third lens, a fourth lens, and a fifth lens. The five lenses are arranged in sequence from the object side to the image side along the optical axis.

[0059] The first lens has positive optical power, and its object-side surface is convex at the optical axis; the second lens has optical power, and its image-side surface is convex at the optical axis; the third lens has optical power; the fourth lens has positive optical power, and its image-side surface is convex at the optical axis; the fifth lens has negative optical power, its object-side surface is convex at the optical axis, and its image-side surface is concave at the optical axis. At least one of the object-side and image-side surfaces of the fifth lens contains at least one inflection point. By setting the inflection point, the angle of the light from the off-axis field of view incident on the photosensitive element can be effectively suppressed, and the aberration of the off-axis field of view can be further corrected, thereby improving the imaging quality.

[0060] An aperture stop is provided between the object side of the optical imaging system and the fifth lens to further improve the imaging quality of the optical imaging system. The aperture stop can be an aperture stop or a field stop.

[0061] Specifically, the optical imaging system satisfies the following relationship: SD11 / SD12<1.1; wherein SD11 is the maximum effective semi-aperture of the object side of the first lens, and SD12 is the maximum effective semi-aperture of the image side of the first lens. SD11 / SD12 can be 0.90, 0.93, 0.95, 0.98, 1.01, 1.04 or 1.07. By controlling the maximum effective semi-aperture of the object side of the first lens and the maximum effective semi-aperture of the image side of the first lens to satisfy the above relationship, the difference in aperture between the object side and the image side of the first lens can be reduced, ensuring that the aperture of the object side of the first lens is not too large, thereby reducing the sensitivity of the optical imaging system. More importantly, by controlling the ratio of SD11 and SD12 to be within the above range, the aperture of the object side of the first lens can be better limited, thereby making the aperture of the lens head equipped with the optical imaging system smaller, thereby realizing the miniaturization of the lens module.

[0062] Specifically, the optical imaging system also satisfies the following relationship: 80°≤FOV≤120°; wherein FOV is the maximum field of view of the optical imaging system. FOV can be 80°, 83°, 87°, 90°, 93°, 96°, 99°, or 100°. By controlling the maximum field of view of the optical imaging system to satisfy the above relationship, it is beneficial to expand the range of lens shooting, increase the shooting scenes, and enable users to obtain a better shooting experience. Preferably, the maximum field of view FOV of the optical imaging system satisfies 80°≤FOV≤100°, thereby effectively reducing the distortion of the image periphery.

[0063] When the above optical imaging system is used for imaging, light emitted or reflected by the subject enters the optical imaging system from the object side, passes through the first lens, second lens, third lens, fourth lens and fifth lens in sequence, and finally converges on the imaging surface.

[0064] The above-mentioned optical imaging system optimizes the aperture, curvature and shape of the first lens while ensuring a large field of view, thereby reducing the aperture of the first lens, making the head size of the optical imaging system smaller, and having better processing performance, which can better meet the application requirements of thin and light electronic devices; at the same time, by reasonably allocating the optical focal length, surface shape and spacing between each lens, the aberration of the optical imaging system can be reduced, thereby ensuring the imaging quality of the optical imaging system.

[0065] In an exemplary embodiment, the aperture is disposed between the object side of the optical imaging system and the first lens. By placing the aperture forward, the excessive increase in the incident angle of the principal ray can be effectively suppressed, thereby making the optical imaging system better compatible with conventional photosensitive chips.

[0066] In an exemplary embodiment, the angle between the tangent line at the vertex of the maximum effective aperture on the object side of the first lens and the normal to the optical axis is θ, and the optical imaging system satisfies the following relationship: θ<20°. θ can be 0.3°, 3.3°, 6.3°, 9.3°, 12.3°, 15.3°, 16.3°, or 19.8°. By lowering the angle between the tangent line at the vertex of the maximum effective aperture on the object side of the first lens and the normal to the optical axis, the processing of the first lens can be facilitated while ensuring a wide-angle optical imaging system, facilitating assembly and mass production of the lens.

[0067] In an exemplary embodiment, the maximum effective semi-aperture of the object side of the first lens is SD11, and the maximum effective semi-aperture of the image side of the fifth lens is SD52. The optical imaging system satisfies the following relationship: SD11 / SD52 < 0.4. SD11 / SD52 can be 0.24, 0.26, 0.28, 0.30, 0.32, 0.34, 0.36, or 0.38. By optimizing the aperture of the object side of the first lens, the optical imaging system can be miniaturized, meeting the requirements of a small lens head design.

[0068] In an exemplary embodiment, the maximum effective semi-aperture of the object side of the first lens is SD11, half of the diagonal length of the effective pixel area on the imaging surface of the optical imaging system is ImgH, and the optical imaging system satisfies the following relationship: SD11 / ImgH ≤ 0.27. SD11 / ImgH can be 0.20, 0.21, 0.22, 0.23, 0.24, 0.25, 0.26, or 0.27. By controlling the maximum effective semi-aperture of the object side of the first lens and half of the diagonal length of the effective pixel area on the imaging surface of the optical imaging system to satisfy the above relationship, the lens can have a smaller head diameter when used with a photosensitive chip of the same size, which is conducive to miniaturization of the lens and better meets the application requirements of thin and light electronic devices.

[0069] In an exemplary embodiment, the radius of curvature of the object side of the first lens at the optical axis is R1, the effective focal length of the first lens is f1, and the optical imaging system satisfies the following relationship: 0.3<R1 / f1<0.8. R1 / f1 can be 0.31, 0.36, 0.41, 0.46, 0.51, 0.56, 0.61, 0.66, 0.71, 0.76 or 0.78. By controlling the radius of curvature of the object side of the first lens at the optical axis and the effective focal length of the first lens to satisfy the above relationship, the first lens can be configured with sufficient positive optical power, thereby helping light to be better incident on the optical imaging system; at the same time, it is also beneficial to shorten the overall length of the optical imaging system to achieve miniaturization while ensuring good imaging quality.

[0070] In an exemplary embodiment, the effective focal length of the fifth lens is f5, the effective focal length of the optical imaging system is f, and the optical imaging system satisfies the following relationship: f5 / f<-0.5. f5 / f can be -0.95, -0.90, -0.85, -0.80, -0.75, -0.70, -0.65, -0.60, or -0.55. By controlling the effective focal length of the fifth lens and the effective focal length of the optical imaging system to satisfy the above relationship, aberrations and field curvature of the optical imaging system can be corrected, thereby maintaining optimal optical performance of the system.

[0071] In an exemplary embodiment, half the diagonal length of the effective pixel area on the imaging plane of the optical imaging system is ImgH, the distance on the optical axis from the object side of the first lens to the imaging plane of the optical imaging system is TTL, and the optical imaging system satisfies the following relationship: ImgH / TTL ≥ 0.6. ImgH / TTL can be 0.60, 0.61, 0.62, 0.63, 0.64, 0.65, 0.66, 0.67, 0.68, 0.69, 0.70, 0.71, or 0.72. By controlling the half the diagonal length of the effective pixel area on the imaging plane of the optical imaging system and the distance on the optical axis from the object side of the first lens to the imaging plane of the optical imaging system to satisfy the above relationship, the overall length of the optical imaging system can be shortened, thereby achieving miniaturization of the lens.

[0072] In an exemplary embodiment, the radius of curvature of the object side surface of the third lens at the optical axis is R5, and the radius of curvature of the image side surface of the third lens at the optical axis is R6. The optical imaging system satisfies the following relationship: -1 < R5 / R6 < 1.4. R5 / R6 can be -0.15, 0.05, 0.25, 0.45, 0.65, 0.85, 1.05, 1.25, 1.35, or 1.36. The third lens has positive or negative optical power. By optimizing the radius of curvature of the object and image side surfaces of the third lens, aberrations of the optical imaging system can be reduced, thereby improving the resolving power of the lens.

[0073] In an exemplary embodiment, the Abbe number of the first lens element is V1, the Abbe number of the second lens element is V2, and the optical imaging system satisfies the following relationship: 0.3 < V2 / V1 ≤ 1. V2 / V1 can be 0.32, 0.37, 0.42, 0.47, 0.52, 0.57, 0.62, 0.67, 0.72, 0.77, 0.82, 0.87, 0.92, 0.97, or 1.0. By controlling the Abbe number of the first lens element and the Abbe number of the second lens element to satisfy this relationship, system chromatic aberration is reduced, thereby improving the imaging quality of the optical imaging system.

[0074] In an exemplary embodiment, the thickness of the first lens on the optical axis is CT1, the distance on the optical axis from the object side surface of the first lens to the image side surface of the fifth lens is OAL, and the optical imaging system satisfies the following relationship: CT1 / OAL < 0.21. CT1 / OAL can be 0.11, 0.12, 0.13, 0.14, 0.15, 0.16, 0.17, 0.18, 0.19, or 0.20. By controlling the thickness of the first lens on the optical axis and the distance on the optical axis from the object side surface of the first lens to the image side surface of the fifth lens to satisfy the above relationship, the thickness of the first lens on the optical axis can be kept within a certain range, thereby shortening the overall length of the optical imaging system and meeting the application requirements of thin and light electronic devices.

[0075] In an exemplary embodiment, the maximum field of view of the optical imaging system is FOV, the entrance pupil diameter of the optical imaging system is EPD, and the optical imaging system satisfies the following relationship: 0.7 ≤ tan(FOV / 2) / EPD < 1.6. tan(FOV / 2) / EPD can be 0.70, 0.80, 0.90, 1.0, 1.1, 1.2, 1.3, 1.4, 1.5, or 1.55. By controlling the maximum field of view of the optical imaging system and the entrance pupil diameter of the optical imaging system to meet the above relationship, the field of view of the optical imaging system can be effectively increased, thereby better satisfying the user experience.

[0076] In an exemplary embodiment, the lens surfaces of the first to fifth lenses are all aspherical. By configuring the lens surfaces of each lens as aspherical, it is beneficial to correct aberrations of the optical imaging system and improve the resolution of the image formed by the optical imaging system.

[0077] In an exemplary embodiment, the optical imaging system further includes a filter for filtering out infrared light and / or a protective glass for protecting a photosensitive element, wherein the photosensitive element is located on the imaging surface.

[0078] The optical imaging system according to the above-described embodiment of the present application can utilize multiple lenses, such as the five lenses described above. By optimizing the aperture, curvature, and shape of the first lens, and rationally allocating the focal length, refractive power, surface shape, thickness, and on-axis spacing of each lens, an optical imaging system with a small head aperture is provided while ensuring a wide field of view and good imaging quality, thereby better meeting the application requirements of thin and light electronic devices. It will be understood that although the embodiment is described using five lenses as an example, the optical imaging system is not limited to including five lenses and may include other numbers of lenses if necessary.

[0079] Specific embodiments of the optical imaging system applicable to the above-mentioned embodiments will be further described below with reference to the accompanying drawings.

[0080] Example 1

[0081] The following reference Figures 1 to 2C The optical imaging system of Example 1 of the present application is described.

[0082] Figure 1 FIG. 1 shows a schematic structural diagram of the optical imaging system of Example 1. Figure 1 As shown, the optical imaging system includes, in order from the object side to the image side along the optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5 and an imaging surface S13.

[0083] The first lens L1 has positive refractive power, and its object-side surface S1 and image-side surface S2 are both aspherical surfaces. The object-side surface S1 is convex at the optical axis and convex at the circumference, and the image-side surface S2 is convex at the optical axis and convex at the circumference.

[0084] The second lens L2 has negative refractive power, and its object-side surface S3 and image-side surface S4 are both aspherical surfaces. The object-side surface S3 is concave at the optical axis and concave at the circumference, and the image-side surface S4 is concave at the optical axis and convex at the circumference.

[0085] The third lens L3 has negative refractive power, and its object-side surface S5 and image-side surface S6 are both aspherical surfaces. The object-side surface S5 is convex at the optical axis and concave at the circumference, and the image-side surface S6 is concave at the optical axis and convex at the circumference.

[0086] The fourth lens L4 has positive refractive power, and its object-side surface S7 and image-side surface S8 are both aspherical surfaces, wherein the object-side surface S7 is concave at the optical axis and concave at the circumference, and the image-side surface S8 is convex at the optical axis and convex at the circumference.

[0087] The fifth lens L5 has negative refractive power. Its object-side surface S9 and image-side surface S10 are both aspherical surfaces. The object-side surface S9 is convex at the optical axis and concave at the circumference, and the image-side surface S10 is concave at the optical axis and convex at the circumference.

[0088] A stop STO is further provided between the object OBJ and the first lens L1 to further improve the imaging quality of the optical imaging system.

[0089] The optical imaging system also includes a filter L6 having an object-side surface S11 and an image-side surface S12. Light from object OBJ sequentially passes through surfaces S1 through S12 and is ultimately imaged on imaging surface S13. Optionally, filter L6 is an infrared filter to remove infrared light from external light incident on the optical imaging system, thereby preventing image distortion.

[0090] Table 1 shows the surface type, radius of curvature, thickness, material, refractive index, Abbe number (i.e., Abbe coefficient), and effective focal length of each lens in the optical imaging system of Example 1. The distance from the object side of the first lens to the imaging plane of the optical imaging system on the optical axis, the radius of curvature, thickness, and effective focal length of each lens are all in millimeters (mm). The reference wavelength is 555 nm.

[0091] Table 1

[0092]

[0093]

[0094] As can be seen from Table 1, in this embodiment, the first lens L1 to the fifth lens L5 are all plastic aspheric lenses, and the surface shape x of each aspheric surface is defined by the following formula:

[0095]

[0096] Where x is the distance vector from the vertex of the aspheric surface at a height h along the optical axis; c is the paraxial curvature of the aspheric surface, c = 1 / R (i.e., paraxial curvature c is the reciprocal of the curvature radius R in Table 1); k is the conic coefficient; and Ai is the i-th order coefficient of the aspheric surface. Table 2 below lists the higher-order coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for the aspheric surfaces S1-S10 of the lens in Example 1.

[0097] Table 2

[0098]

[0099]

[0100] The half of the diagonal length ImgH of the effective pixel area on the imaging surface S13 of the optical imaging system of this embodiment is 2.297 mm. Therefore, combining the data in Table 1 and Table 2, it can be seen that the optical imaging system in Example 1 satisfies:

[0101] SD11 / SD12=0.9, where SD11 is the maximum effective semi-aperture of the object-side surface S1 of the first lens L1, and SD12 is the maximum effective semi-aperture of the image-side surface S2 of the first lens L1;

[0102] FOV = 100°, where FOV is the maximum field of view of the optical imaging system;

[0103] |θ| = 7.2°, where θ is the angle between the tangent line at the vertex of the maximum effective aperture of the object side surface S1 of the first lens L1 and the normal to the optical axis;

[0104] SD11 / SD52=0.26, where SD11 is the maximum effective semi-aperture of the object-side surface S1 of the first lens L1, and SD52 is the maximum effective semi-aperture of the image-side surface S10 of the fifth lens L5;

[0105] SD11 / ImgH=0.22, where SD11 is the maximum effective semi-aperture of the object-side surface S1 of the first lens L1, and ImgH is half the diagonal length of the effective pixel area on the imaging surface S13 of the optical imaging system;

[0106] R1 / f1=0.77, where R1 is the radius of curvature of the object-side surface S1 of the first lens L1 at the optical axis, and f1 is the effective focal length of the first lens L1;

[0107] f5 / f=-0.98, where f5 is the effective focal length of the fifth lens element L5, and f is the effective focal length of the optical imaging system;

[0108] ImgH / TTL=0.71, where ImgH is half the diagonal length of the effective pixel area on the imaging plane S13 of the optical imaging system, and TTL is the distance on the optical axis from the object-side surface S1 of the first lens L1 to the imaging plane S13 of the optical imaging system;

[0109] R5 / R6=1.16, where R5 is the radius of curvature of the object-side surface S5 of the third lens element L3 at the optical axis, and R6 is the radius of curvature of the image-side surface S6 of the third lens element L3 at the optical axis;

[0110] V2 / V1=0.36, where V1 is the Abbe number of the first lens element L1, and V2 is the Abbe number of the second lens element L2;

[0111] CT1 / OAL=0.2, where CT1 is the thickness of the first lens element L1 on the optical axis, and OAL is the distance from the object-side surface S1 of the first lens element L1 to the image-side surface S10 of the fifth lens element L5 on the optical axis.

[0112] tan(FOV / 2) / EPD=1.22, where FOV is the maximum field of view of the optical imaging system, and EPD is the entrance pupil diameter of the optical imaging system.

[0113] Figure 2A The longitudinal spherical aberration curves of the optical imaging system of Example 1 are shown, which respectively represent the deviation of the focal point of light rays with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm, and 650 nm after passing through the optical imaging system; Figure 2B 1 shows an astigmatism curve of the optical imaging system of Example 1, which represents meridional image curvature and sagittal image curvature; Figure 2C The distortion curve of the optical imaging system of Example 1 is shown, which represents the distortion rate under different image heights. Figures 2A to 2C It can be seen that the optical imaging system provided in Example 1 can achieve good imaging quality.

[0114] Example 2

[0115] The following reference Figures 3 to 4C The optical imaging system of Example 2 of the present application is described. In this embodiment, for the sake of brevity, some descriptions similar to those of Example 1 will be omitted. Figure 3 A structural schematic diagram of the optical imaging system of Example 2 of the present application is shown.

[0116] like Figure 3As shown, the optical imaging system includes, in order from the object side to the image side along the optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5 and an imaging surface S13.

[0117] The first lens L1 has positive refractive power, and its object-side surface S1 and image-side surface S2 are both aspherical surfaces. The object-side surface S1 is convex at the optical axis and convex at the circumference, and the image-side surface S2 is concave at the optical axis and convex at the circumference.

[0118] The second lens L2 has negative refractive power, and its object-side surface S3 and image-side surface S4 are both aspherical surfaces. The object-side surface S3 is concave at the optical axis and at the circumference, and the image-side surface S4 is concave at the optical axis and at the circumference.

[0119] The third lens L3 has positive refractive power, and its object-side surface S5 and image-side surface S6 are both aspherical surfaces. The object-side surface S5 is convex at the optical axis and concave at the circumference, and the image-side surface S6 is concave at the optical axis and convex at the circumference.

[0120] The fourth lens L4 has positive refractive power, and its object-side surface S7 and image-side surface S8 are both aspherical surfaces, wherein the object-side surface S7 is concave at the optical axis and concave at the circumference, and the image-side surface S8 is convex at the optical axis and convex at the circumference.

[0121] The fifth lens L5 has negative refractive power. Its object-side surface S9 and image-side surface S10 are both aspherical surfaces. The object-side surface S9 is convex at the optical axis and concave at the circumference, and the image-side surface S10 is concave at the optical axis and convex at the circumference.

[0122] A stop STO is further provided between the object OBJ and the first lens L1 to further improve the imaging quality of the optical imaging system.

[0123] The optical imaging system also includes a filter L6 having an object-side surface S11 and an image-side surface S12. Light from object OBJ sequentially passes through surfaces S1 through S12 and is ultimately imaged on imaging surface S13. Optionally, filter L6 is an infrared filter to remove infrared light from external light incident on the optical imaging system, thereby preventing image distortion.

[0124] Table 3 shows the surface type, radius of curvature, thickness, material, refractive index, Abbe number, and effective focal length of each lens of the optical imaging system of Example 2, where the units of the radius of curvature, thickness, and effective focal length of each lens are all in millimeters (mm). Table 4 shows the high-order coefficients of the aspheric surfaces S1-S10 of the lenses that can be used in Example 2, where the aspheric surface shape can be defined by formula (1) given in Example 1. Table 5 shows the numerical values ​​of the relevant parameters of the optical imaging system given in Example 2. The reference wavelength is 555 nm.

[0125] Table 3

[0126]

[0127] Table 4

[0128]

[0129]

[0130] Table 5

[0131] f(mm) 2.31 SD11 / ImgH 0.21 FNO 2.4 R1 / f1 0.54 FOV(degree) 87 f5 / f -0.70 ImgH(mm) 2.30 ImgH / TTL 0.69 TTL(mm) 3.32 R5 / R6 0.25 SD11 / SD12 1.01 V2 / V1 0.42 |θ| (degrees) 14.4 CT1 / OAL 0.16 SD11 / SD52 0.26 <![CDATA[tan(FOV / 2) / EPD(mm -1 )]]> 0.99

[0132] Figure 4A The longitudinal spherical aberration curves of the optical imaging system of Example 2 are shown, which respectively represent the deviation of the focal point of light of different wavelengths after passing through the optical imaging system; Figure 4B 10 shows an astigmatism curve of the optical imaging system of Example 2, which represents meridional image curvature and sagittal image curvature; Figure 4C The distortion curve of the optical imaging system of Example 2 is shown, which represents the distortion rate under different image heights. Figures 4A to 4C It can be seen that the optical imaging system provided in Example 2 can achieve good imaging quality.

[0133] Example 3

[0134] The following reference Figures 5 to 6C The optical imaging system of Example 3 of the present application is described. In this embodiment, for the sake of brevity, some descriptions similar to those of Example 1 will be omitted. Figure 5 A schematic structural diagram of the optical imaging system of Example 3 of the present application is shown.

[0135] like Figure 5 As shown, the optical imaging system includes, in order from the object side to the image side along the optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5 and an imaging surface S13.

[0136] The first lens L1 has positive refractive power, and its object-side surface S1 and image-side surface S2 are both aspherical surfaces. The object-side surface S1 is convex at the optical axis and convex at the circumference, and the image-side surface S2 is concave at the optical axis and convex at the circumference.

[0137] The second lens L2 has negative refractive power, and its object-side surface S3 and image-side surface S4 are both aspherical surfaces. The object-side surface S3 is concave at the optical axis and at the circumference, and the image-side surface S4 is concave at the optical axis and at the circumference.

[0138] The third lens L3 has positive refractive power, and its object-side surface S5 and image-side surface S6 are both aspherical surfaces. The object-side surface S5 is convex at the optical axis and at the circumference, and the image-side surface S6 is convex at the optical axis and at the circumference.

[0139] The fourth lens L4 has positive refractive power, and its object-side surface S7 and image-side surface S8 are both aspherical surfaces, wherein the object-side surface S7 is concave at the optical axis and concave at the circumference, and the image-side surface S8 is convex at the optical axis and concave at the circumference.

[0140] The fifth lens L5 has negative refractive power. Its object-side surface S9 and image-side surface S10 are both aspherical surfaces. The object-side surface S9 is convex at the optical axis and concave at the circumference, and the image-side surface S10 is concave at the optical axis and convex at the circumference.

[0141] A stop STO is further provided between the object OBJ and the first lens L1 to further improve the imaging quality of the optical imaging system.

[0142] The optical imaging system also includes a filter L6 having an object-side surface S11 and an image-side surface S12. Light from object OBJ sequentially passes through surfaces S1 through S12 and is ultimately imaged on imaging surface S13. Optionally, filter L6 is an infrared filter to remove infrared light from external light incident on the optical imaging system, thereby preventing image distortion.

[0143] Table 6 shows the surface type, radius of curvature, thickness, material, refractive index, Abbe number, and effective focal length of each lens of the optical imaging system of Example 3, where the units of the radius of curvature, thickness, and effective focal length of each lens are all in millimeters (mm). Table 7 shows the high-order coefficients of the aspheric surfaces S1-S10 of the lenses that can be used in Example 3, where the aspheric surface shape can be defined by formula (1) given in Example 1. Table 8 shows the numerical values ​​of the relevant parameters of the optical imaging system given in Example 3. The reference wavelength is 555 nm.

[0144] Table 6

[0145]

[0146] Table 7

[0147]

[0148]

[0149] Table 8

[0150] f(mm) 3.04 SD11 / ImgH 0.23 FNO 2.4 R1 / f1 0.53 FOV(degree) 83.2 f5 / f -0.59 ImgH(mm) 2.82 ImgH / TTL 0.68 TTL(mm) 4.17 R5 / R6 -0.05 SD11 / SD12 1.02 V2 / V1 1.00 |θ| (degrees) 16.3 CT1 / OAL 0.15 SD11 / SD52 0.30 <![CDATA[tan(FOV / 2) / EPD(mm -1 )]]> 0.70

[0151] Figure 6AThe longitudinal spherical aberration curves of the optical imaging system of Example 3 are shown, which respectively represent the deviation of the focal point of light of different wavelengths after passing through the optical imaging system; Figure 6B FIG4 shows an astigmatism curve of the optical imaging system of Example 3, which represents meridional image curvature and sagittal image curvature; Figure 6C The distortion curve of the optical imaging system of Example 3 is shown, which represents the distortion rate under different image heights. Figures 6A to 6C It can be seen that the optical imaging system provided in Example 3 can achieve good imaging quality.

[0152] Example 4

[0153] The following reference Figures 7 to 8C The optical imaging system of Example 4 of the present application is described. In this embodiment, for the sake of brevity, some descriptions similar to those of Example 1 will be omitted. Figure 7 A structural schematic diagram of the optical imaging system of Example 4 of the present application is shown.

[0154] like Figure 7 As shown, the optical imaging system includes, in order from the object side to the image side along the optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5 and an imaging surface S13.

[0155] The first lens L1 has positive refractive power, and its object-side surface S1 and image-side surface S2 are both aspherical surfaces. The object-side surface S1 is convex at the optical axis and concave at the circumference, and the image-side surface S2 is convex at the optical axis and convex at the circumference.

[0156] The second lens L2 has negative refractive power, and its object-side surface S3 and image-side surface S4 are both aspherical surfaces. The object-side surface S3 is concave at the optical axis and at the circumference, and the image-side surface S4 is concave at the optical axis and at the circumference.

[0157] The third lens L3 has negative refractive power, and its object-side surface S5 and image-side surface S6 are both aspherical surfaces. The object-side surface S5 is convex at the optical axis and concave at the circumference, and the image-side surface S6 is concave at the optical axis and convex at the circumference.

[0158] The fourth lens L4 has positive refractive power, and its object-side surface S7 and image-side surface S8 are both aspherical surfaces, wherein the object-side surface S7 is concave at the optical axis and concave at the circumference, and the image-side surface S8 is convex at the optical axis and convex at the circumference.

[0159] The fifth lens L5 has negative refractive power. Its object-side surface S9 and image-side surface S10 are both aspherical surfaces. The object-side surface S9 is convex at the optical axis and concave at the circumference, and the image-side surface S10 is concave at the optical axis and convex at the circumference.

[0160] A stop STO is further provided between the first lens L1 and the second lens L2 to further improve the imaging quality of the optical imaging system.

[0161] The optical imaging system also includes a filter L6 having an object-side surface S11 and an image-side surface S12. Light from object OBJ sequentially passes through surfaces S1 through S12 and is ultimately imaged on imaging surface S13. Optionally, filter L6 is an infrared filter to remove infrared light from external light incident on the optical imaging system, thereby preventing image distortion.

[0162] Table 9 shows the surface type, radius of curvature, thickness, material, refractive index, Abbe number, and effective focal length of each lens of the optical imaging system of Example 4, where the units of the radius of curvature, thickness, and effective focal length of each lens are all in millimeters (mm). Table 10 shows the higher-order coefficients of the aspheric surfaces S1-S10 of the lenses that can be used in Example 4, where the aspheric surface shape can be defined by formula (1) given in Example 1. Table 11 shows the numerical values ​​of the relevant parameters of the optical imaging system given in Example 4. The reference wavelength is 555 nm.

[0163] Table 9

[0164]

[0165] Table 10

[0166]

[0167] Table 11

[0168]

[0169]

[0170] Figure 8A The longitudinal spherical aberration curves of the optical imaging system of Example 4 are shown, which respectively represent the deviation of the focal point of light of different wavelengths after passing through the optical imaging system; Figure 8B 10 shows an astigmatism curve of the optical imaging system of Example 4, which represents meridional image curvature and sagittal image curvature; Figure 8C The distortion curve of the optical imaging system of Example 4 is shown, which represents the distortion rate under different image heights. Figures 8A to 8C It can be seen that the optical imaging system provided in Example 4 can achieve good imaging quality.

[0171] Example 5

[0172] The following reference Figures 9 to 10C The optical imaging system of Example 5 of the present application is described. In this embodiment, for the sake of brevity, some descriptions similar to those of Example 1 will be omitted. Figure 9A structural schematic diagram of the optical imaging system of Example 5 of the present application is shown.

[0173] like Figure 9 As shown, the optical imaging system includes, in order from the object side to the image side along the optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5 and an imaging surface S13.

[0174] The first lens L1 has positive refractive power, and its object-side surface S1 and image-side surface S2 are both aspherical surfaces. The object-side surface S1 is convex at the optical axis and convex at the circumference, and the image-side surface S2 is convex at the optical axis and convex at the circumference.

[0175] The second lens L2 has negative refractive power, and its object-side surface S3 and image-side surface S4 are both aspherical surfaces. The object-side surface S3 is convex at the optical axis and concave at the circumference, and the image-side surface S4 is concave at the optical axis and concave at the circumference.

[0176] The third lens L3 has negative refractive power, and its object-side surface S5 and image-side surface S6 are both aspherical surfaces. The object-side surface S5 is convex at the optical axis and convex at the circumference, and the image-side surface S6 is concave at the optical axis and convex at the circumference.

[0177] The fourth lens L4 has positive refractive power, and its object-side surface S7 and image-side surface S8 are both aspherical surfaces, wherein the object-side surface S7 is concave at the optical axis and concave at the circumference, and the image-side surface S8 is convex at the optical axis and convex at the circumference.

[0178] The fifth lens L5 has negative refractive power. Its object-side surface S9 and image-side surface S10 are both aspherical surfaces. The object-side surface S9 is convex at the optical axis and concave at the circumference, and the image-side surface S10 is concave at the optical axis and convex at the circumference.

[0179] A stop STO is further provided between the object OBJ and the first lens L1 to further improve the imaging quality of the optical imaging system.

[0180] The optical imaging system also includes a filter L6 having an object-side surface S11 and an image-side surface S12. Light from object OBJ sequentially passes through surfaces S1 through S12 and is ultimately imaged on imaging surface S13. Optionally, filter L6 is an infrared filter to remove infrared light from external light incident on the optical imaging system, thereby preventing image distortion.

[0181] Table 12 shows the surface type, radius of curvature, thickness, material, refractive index, Abbe number, and effective focal length of each lens of the optical imaging system of Example 5, where the units of the radius of curvature, thickness, and effective focal length of each lens are all in millimeters (mm). Table 13 shows the higher-order coefficients of the aspheric surfaces S1-S10 of the lenses that can be used in Example 5, where the aspheric surface shape can be defined by formula (1) given in Example 1. Table 14 shows the numerical values ​​of the relevant parameters of the optical imaging system given in Example 5. The reference wavelength is 555 nm.

[0182] Table 12

[0183]

[0184]

[0185] Table 13

[0186]

[0187] Table 14

[0188]

[0189]

[0190] Figure 10A The longitudinal spherical aberration curves of the optical imaging system of Example 5 are shown, which respectively represent the deviation of the focal point of light of different wavelengths after passing through the optical imaging system; Figure 10B FIG4 shows an astigmatism curve of the optical imaging system of Example 5, which represents meridional image curvature and sagittal image curvature; Figure 10C The distortion curve of the optical imaging system of Example 5 is shown, which represents the distortion rate under different image heights. Figures 10A to 10C It can be seen that the optical imaging system provided in Example 5 can achieve good imaging quality.

[0191] Example 6

[0192] The following reference Figures 11 to 12C The optical imaging system of Example 6 of the present application is described. In this embodiment, for the sake of brevity, some descriptions similar to those of Example 1 will be omitted. Figure 11 A structural schematic diagram of the optical imaging system of Example 6 of the present application is shown.

[0193] like Figure 11 As shown, the optical imaging system includes, in order from the object side to the image side along the optical axis, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5 and an imaging surface S13.

[0194] The first lens L1 has positive refractive power, and its object-side surface S1 and image-side surface S2 are both aspherical surfaces. The object-side surface S1 is convex at the optical axis and convex at the circumference, and the image-side surface S2 is convex at the optical axis and convex at the circumference.

[0195] The second lens L2 has negative refractive power, and its object-side surface S3 and image-side surface S4 are both aspherical surfaces. The object-side surface S3 is concave at the optical axis and concave at the circumference, and the image-side surface S4 is concave at the optical axis and convex at the circumference.

[0196] The third lens L3 has negative refractive power, and its object-side surface S5 and image-side surface S6 are both aspherical surfaces. The object-side surface S5 is convex at the optical axis and convex at the circumference, and the image-side surface S6 is concave at the optical axis and convex at the circumference.

[0197] The fourth lens L4 has positive refractive power, and its object-side surface S7 and image-side surface S8 are both aspherical surfaces, wherein the object-side surface S7 is convex at the optical axis and convex at the circumference, and the image-side surface S8 is convex at the optical axis and concave at the circumference.

[0198] The fifth lens L5 has negative refractive power. Its object-side surface S9 and image-side surface S10 are both aspherical surfaces. The object-side surface S9 is convex at the optical axis and concave at the circumference, and the image-side surface S10 is concave at the optical axis and convex at the circumference.

[0199] A stop STO is further provided between the object OBJ and the first lens L1 to further improve the imaging quality of the optical imaging system.

[0200] The optical imaging system also includes a filter L6 having an object-side surface S11 and an image-side surface S12. Light from object OBJ sequentially passes through surfaces S1 through S12 and is ultimately imaged on imaging surface S13. Optionally, filter L6 is an infrared filter to remove infrared light from external light incident on the optical imaging system, thereby preventing image distortion.

[0201] Table 15 shows the surface type, radius of curvature, thickness, material, refractive index, Abbe number, and effective focal length of each lens of the optical imaging system of Example 6, where the units of the radius of curvature, thickness, and effective focal length of each lens are all in millimeters (mm). Table 16 shows the higher-order coefficients of the aspheric surfaces S1-S10 of the lenses in Example 6, where the aspheric surface shape can be defined by formula (1) given in Example 1. Table 17 shows the numerical values ​​of the relevant parameters of the optical imaging system given in Example 6. The reference wavelength is 555 nm.

[0202] Table 15

[0203]

[0204]

[0205] Table 16

[0206]

[0207]

[0208] Table 17

[0209] f(mm) 1.99 SD11 / ImgH 0.26 FNO 2.2 R1 / f1 0.77 FOV(degree) 80.0 f5 / f -0.95 ImgH(mm) 1.74 ImgH / TTL 0.60 TTL(mm) 2.88 R5 / R6 1.36 SD11 / SD12 0.97 V2 / V1 0.48 |θ| (degrees) 0.30 CT1 / OAL 0.17 SD11 / SD52 0.38 <![CDATA[tan(FOV / 2) / EPD(mm -1 )]]> 0.93

[0210] Figure 12A The longitudinal spherical aberration curves of the optical imaging system of Example 6 are shown, which respectively represent the deviation of the focal point of light of different wavelengths after passing through the optical imaging system; Figure 12B 10 shows an astigmatism curve of the optical imaging system of Example 6, which indicates meridional image curvature and sagittal image curvature; Figure 12C The distortion curve of the optical imaging system of Example 6 is shown, which represents the distortion rate under different image heights. Figures 10A to 10C It can be seen that the optical imaging system provided in Example 6 can achieve good imaging quality.

[0211] The present application also provides an imaging device, comprising the optical imaging system as described above; and a photosensitive element, the photosensitive element being disposed on the image side of the optical imaging system to receive light carrying image information formed by the optical imaging system. Specifically, the photosensitive element may be a complementary metal oxide semiconductor (CMOS) image sensor or a charge-coupled device (CCD) image sensor.

[0212] The above-mentioned imaging device can capture wide-angle images with small aberration and high resolution using the optical imaging system described above. At the same time, the imaging device is also miniaturized, making it easy to adapt to devices with limited size, such as thin and light electronic devices.

[0213] The present application also provides an electronic device, comprising a housing and the imaging device as described above, wherein the imaging device is mounted on the housing to capture images.

[0214] Specifically, the imaging device is arranged in the shell and exposed from the shell to capture images. The shell can provide the imaging device with dustproof, waterproof and drop-proof protection. A hole corresponding to the imaging device is opened on the shell to allow light to enter or exit the shell through the hole.

[0215] The above-mentioned electronic device has the characteristics of a lightweight and thin structure. Using the imaging device as described above, it can capture images with a wide angle and good imaging quality, meeting the shooting requirements of cameras of equipment such as mobile phones, vehicles, monitoring, and medical devices.

[0216] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0217] The above-described embodiments merely illustrate several implementations of the present invention, and while their descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent. It should be noted that a person skilled in the art would be able to make numerous variations and improvements without departing from the spirit of the present invention, all of which fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent for this invention shall be determined by the appended claims.

Claims

1. An optical imaging system comprising five lenses having optical power, wherein the optical imaging system comprises, in order from the object side to the image side along the optical axis: The first lens, the second lens, the third lens, the fourth lens and the fifth lens are characterized in that: The first lens has positive refractive power, and its object-side surface is convex at the optical axis, and its image-side surface is convex at the optical axis; The second lens has negative optical power, and its image side surface is concave at the optical axis; The third lens has negative refractive power, and its object-side surface is convex at the optical axis, and its image-side surface is concave at the optical axis; The fourth lens has positive refractive power, and its object-side surface is concave at the optical axis, and its image-side surface is convex at the optical axis; The fifth lens element has negative optical power, and its object-side surface is convex at the optical axis, and its image-side surface is concave at the optical axis. At least one of the object-side surface and the image-side surface of the fifth lens element includes at least one inflection point. An aperture is provided between the object side of the optical imaging system and the fifth lens; The optical imaging system satisfies the following relationship: 0.9≤SD11 / SD12<1.1; ； Among them, SD11 is the maximum effective semi-aperture of the object side of the first lens, SD12 is the maximum effective semi-aperture of the image side of the first lens, and FOV is the maximum field of view of the optical imaging system.

2. The optical imaging system according to claim 1, wherein: The aperture is arranged between the object side of the optical imaging system and the first lens.

3. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following relationship: ； in, It is the angle between the tangent line of the vertex of the maximum effective aperture of the objective side of the first lens and the normal line of the optical axis.

4. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following relationship: 0.26≤SD11 / SD52<0.4; Wherein, SD11 is the maximum effective semi-aperture of the object side of the first lens, and SD52 is the maximum effective semi-aperture of the image side of the fifth lens.

5. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following relationship: 0.21≤SD11 / ImgH≤0.27; Among them, SD11 is the maximum effective semi-aperture of the object side of the first lens, and ImgH is half of the diagonal length of the effective pixel area on the imaging surface of the optical imaging system.

6. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following relationship: 0.3<R1 / f1<0.8; Wherein, R1 is the radius of curvature of the object side of the first lens at the optical axis, and f1 is the effective focal length of the first lens.

7. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following relationship: -0.98≤f5 / f<-0.5; Wherein, f5 is the effective focal length of the fifth lens, and f is the effective focal length of the optical imaging system.

8. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following relationship: ImgH / TTL≥0.6; Wherein, ImgH is half of the diagonal length of the effective pixel area on the imaging plane of the optical imaging system, and TTL is the distance from the object side of the first lens to the imaging plane of the optical imaging system on the optical axis.

9. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following relationship: 1.16≤R5 / R6<1.4; Wherein, R5 is the curvature radius of the object side of the third lens at the optical axis, and R6 is the curvature radius of the image side of the third lens at the optical axis.

10. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following relationship: 0.3<V2 / V1≤1; Wherein, V1 is the dispersion coefficient of the first lens, and V2 is the dispersion coefficient of the second lens.

11. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following relationship: 0.11≤CT1 / OAL<0.21; Wherein, CT1 is the thickness of the first lens on the optical axis, and OAL is the distance from the object side surface of the first lens to the image side surface of the fifth lens on the optical axis.

12. The optical imaging system according to claim 1, wherein: The optical imaging system satisfies the following relationship: 0.93≤tan(FOV / 2) / EPD<1.6; Wherein, FOV is the maximum field of view of the optical imaging system, and EPD is the entrance pupil diameter of the optical imaging system.

13. An imaging device, characterized in that: include: The optical imaging system according to any one of claims 1 to 12; and a photosensitive element, wherein the photosensitive element is arranged on the image side of the optical imaging system.

14. An electronic device, characterized in that: include: and the imaging device according to claim 13, wherein the imaging device is mounted on the housing.

Images