Optical System, Camera Module and Electronic Device

Abstract

The present invention relates to an optical system, a camera module and an electronic device. The optical system includes, in order along the incident light path: a positive first lens, whose object side surface is convex at the near axis and whose image side surface is flat at the near axis; an optical path refracting element, including an incident surface, a reflecting surface and an exit surface, the image side surface of the first lens is glued to the incident surface, and the reflecting surface is used to reflect the light from the first lens to the exit surface; a positive second lens, whose object side surface and image side surface are both convex at the near axis; a third lens, whose object side surface is concave at the near axis and whose image side surface is convex at the near axis; a fourth lens, whose object side surface is concave at the near axis; a negative fifth lens, whose object side surface is convex at the near axis and whose image side surface is concave at the near axis; and a negative sixth lens. The above optical system can avoid the aperture of the first lens affecting the aperture size of the lens group after the optical path is refracted, and reduce the limitation of the device thickness on the lens group after the optical path is refracted.

Description

Technical Field

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

[0002] Since the incorporation of camera lenses into electronic devices like smartphones and tablets, the performance of these devices has undergone significant changes as users' demand for high-quality video has increased. In general, capturing distant scenes is inevitable. However, the pursuit of reduced device thickness often places significant constraints on the longitudinal dimensions of the optical system within the device. This results in a focal length that is too small, making it difficult to achieve good imaging results. Therefore, maintaining excellent imaging performance while maintaining a relatively thin device has become a key concern in the industry. Summary of the Invention

[0003] Based on this, it is necessary to provide an optical system, a camera module and an electronic device to address the problem of how to reduce the thickness of the device while maintaining good shooting performance.

[0004] An optical system, comprising, in order along an incident light path:

[0005] a first lens having positive refractive power, wherein the object-side surface of the first lens is convex at the paraxial position and the image-side surface of the first lens is flat at the paraxial position;

[0006] an optical path deflecting element, comprising an incident surface, a reflecting surface, and an exit surface, wherein the image side surface of the first lens is glued to the incident surface, and the reflecting surface is used to reflect light from the first lens to the exit surface;

[0007] a second lens having positive refractive power, wherein the object-side surface of the second lens is convex at the paraxial position, the image-side surface is also convex at the paraxial position, and the exit surface of the optical path deflecting element faces the object-side surface of the second lens;

[0008] a third lens having refractive power, wherein the object-side surface of the third lens is concave at the paraxial position and the image-side surface of the third lens is convex at the paraxial position;

[0009] a fourth lens having refractive power, wherein the object-side surface of the fourth lens is concave at the paraxial position;

[0010] a fifth lens element having negative refractive power, wherein the object-side surface of the fifth lens element is convex at the paraxial direction and the image-side surface of the fifth lens element is concave at the paraxial direction; and

[0011] The sixth lens element has negative refractive power.

[0012] In the above optical system, the first lens has positive refractive power, and the object-side surface of the first lens is convex near the optical axis, thereby providing excellent light convergence and helping to reduce the aperture of the second lens. The second lens has positive refractive power, and both the object-side and image-side surfaces of the second lens are convex near the optical axis, thereby providing excellent light convergence and helping to shorten the length of the system. Furthermore, the fifth and sixth lenses have negative refractive power configurations, which can correct the system's spherical aberration, coma, and astigmatism, helping to improve the system's imaging quality.

[0013] In addition, the optical path deflecting element is used to deflect the light from the first lens, thereby changing the incident light path of the optical system and reducing the size of the system in the direction of the optical path after deflection (longitudinal direction), that is, shortening the longitudinal size of the system. On the other hand, by gluing the image side surface of the first lens to the incident surface of the optical path deflecting element, the aperture size of the system in the lateral direction can be effectively reduced. As described above, by setting the optical path deflecting element and gluing the image side surface of the first lens to the incident surface of the optical path deflecting element, the size of the system can be effectively reduced, so that the system can be installed in a device with a relatively thin thickness. In particular, since the first lens is set on the incident surface of the optical path deflecting element, it is possible to avoid the aperture of the first lens affecting the aperture size of the lens group (composed of the second lens to the sixth lens) after the optical path is deflected, which is beneficial to keep the aperture of the lens group after the optical path is deflected smaller, thereby reducing the limitation of the thickness of the device on the lens group after the optical path is deflected. And because the light path deflecting element is arranged between the lenses of the system, it can effectively increase the distance that the incident light enters the system and is adjusted by the lens, which is beneficial to increase the focal length of the optical system and make the optical system have a long focus characteristic to achieve a telephoto effect.

[0014] In one embodiment, the optical system satisfies the following relationship:

[0015] 1.5≤TTL / (ImgH*2)≤2.5;

[0016] TTL is the distance from the object-side surface of the second lens to the imaging plane of the optical system on the optical axis, and ImgH is half the diagonal length of the imaging plane of the optical system within the effective imaging area. When these relationships are met, the distance from the second lens to the imaging plane and the size of the imaging plane can be controlled within a relatively small range, thereby enabling a reasonable system layout and achieving a compact design.

[0017] In one embodiment, the optical system satisfies the following relationship:

[0018] 0.6≤DL / TTL≤0.8;

[0019] DL is the distance on the optical axis from the object-side surface of the second lens to the image-side surface of the sixth lens, and TTL is the distance on the optical axis from the object-side surface of the second lens to the imaging plane of the optical system. By achieving system miniaturization through a reasonable structural layout and further satisfying the above relationship, the space occupied by the lens assembly after the optical path is folded can be effectively reduced, thereby facilitating the layout of the module structure.

[0020] In one embodiment, the optical system satisfies the following relationship:

[0021] 12°≤HFOV≤18°;

[0022] HFOV is half of the maximum field of view of the optical system in the diagonal direction. When the above relationship is met, the optical system has a telephoto condition to achieve a telephoto effect.

[0023] In one embodiment, the optical system satisfies the following relationship:

[0024] 0.9≤TTL / f≤1.2;

[0025] TTL is the distance along the optical axis from the object-side surface of the second lens to the imaging plane of the optical system, and f is the effective focal length of the optical system. When this relationship is satisfied, and HFOV ≤ 18°, the longitudinal dimensions of the optical system can be further shortened, facilitating a smaller lens height and facilitating application in miniaturized devices. The use of an aspheric surface minimizes the ratio of TTL to effective focal length, facilitating balanced aberrations such as chromatic and spherical aberrations in the imaging device while achieving telephoto photography, resulting in excellent imaging quality.

[0026] In one embodiment, the object-side surface and / or image-side surface of at least one lens in the optical system is aspherical. The aspherical design is beneficial for improving the design flexibility of the system, optimizing the system's aberrations, and helping the optical system have good imaging quality while maintaining miniaturization. In particular, the aspherical design of the lens is beneficial for making the relationship between TTL and f easier to control within the above-mentioned relationship range, so that the ratio of the two can be maintained within a relatively small range. At the same time, when the above-mentioned telephoto effect is achieved, the aspherical design is also more conducive to balancing the system's various aberrations, such as chromatic aberration and spherical aberration, so that the system can achieve good imaging quality.

[0027] In one embodiment, the optical system satisfies the following relationship:

[0028] f 2-6 >0;

[0029] f 2-6is the combined focal length of each lens from the second to the sixth lens. When this relationship is satisfied, the lens group along the folded optical path can effectively balance and correct aberrations caused by the first lens, facilitate effective convergence of marginal light, and simultaneously make the system structure more compact, effectively reducing the system size, thereby facilitating telephoto and miniaturization.

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

[0031] T45 / T56≤0.3;

[0032] T45 is the distance along the optical axis from the image side of the fourth lens to the object side of the fifth lens, and T56 is the distance along the optical axis from the image side of the fifth lens to the object side of the sixth lens. When these relationships are met, the lens spacing between the fourth and sixth lenses can be optimally arranged, thereby minimizing the longitudinal dimensions of the system.

[0033] In one embodiment, the fourth and fifth lenses form a lens group with negative refractive power, and the object-side surface of the sixth lens is convex at the paraxial axis, while the image-side surface is concave at the paraxial axis. Because the lens group formed by the fourth and fifth lenses diverges light, forming a curved double-Gaussian structure with the fifth and sixth lenses can mitigate the angle of light emitted by the sixth lens, helping to reduce the intensity of stray light.

[0034] In one embodiment, the optical system satisfies the following relationship:

[0035] |f2 / f1|≤1;

[0036] f1 is the focal length of the first lens, and f2 is the focal length of the second lens. When this relationship is satisfied, the refractive powers of the first and second lenses can be optimally configured to balance the significant spherical aberration generated by the front lens group formed by the first and second lenses. Furthermore, the refractive power of the rear lens group formed by the third through sixth lenses can be controlled to enhance the correction of peripheral aberrations, thereby improving the overall resolution of the optical system. Furthermore, satisfying this relationship also helps reduce the size of the optical system, facilitating a compact design.

[0037] In one embodiment, the optical system satisfies the following relationship:

[0038] |V2-V4|≥30;

[0039] Wherein, V2 is the dispersion coefficient of the second lens, and V4 is the dispersion coefficient of the fourth lens. When the above relationship is satisfied, it is beneficial to correct the chromatic aberration of the system and ensure good imaging quality.

[0040] A camera module comprises a photosensitive element and the optical system described in any one of the above embodiments, wherein the photosensitive element is disposed on the image side of the optical system. By employing this optical system, the size of the camera module can be effectively reduced, enabling installation in thinner devices. This also facilitates the camera module to possess a telephoto characteristic, thereby achieving a telephoto effect.

[0041] An electronic device includes a fixing member and the aforementioned camera module, wherein the camera module is disposed on the fixing member. The adoption of the aforementioned camera module is beneficial for reducing the thickness of the electronic device and for enhancing the telephoto performance of the electronic device. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 A schematic structural diagram of an optical system provided in the first embodiment of the present application;

[0043] Figure 2 including a longitudinal spherical aberration diagram, an astigmatism diagram, and a distortion diagram of the optical system in the first embodiment;

[0044] Figure 3 A schematic structural diagram of an optical system provided in the second embodiment of the present application;

[0045] Figure 4 including a longitudinal spherical aberration diagram, an astigmatism diagram, and a distortion diagram of the optical system in the second embodiment;

[0046] Figure 5 A schematic structural diagram of an optical system provided in the third embodiment of the present application;

[0047] Figure 6 including a longitudinal spherical aberration diagram, an astigmatism diagram, and a distortion diagram of the optical system in the third embodiment;

[0048] Figure 7 A schematic structural diagram of an optical system provided in a fourth embodiment of the present application;

[0049] Figure 8 including a longitudinal spherical aberration diagram, an astigmatism diagram, and a distortion diagram of the optical system in the fourth embodiment;

[0050] Figure 9 A schematic structural diagram of an optical system provided in a fifth embodiment of the present application;

[0051] Figure 10 including a diagram of longitudinal spherical aberration, a diagram of astigmatism, and a diagram of distortion of the optical system in the fifth embodiment;

[0052] Figure 11 A schematic structural diagram of an optical system provided in a sixth embodiment of the present application;

[0053] Figure 12 including a longitudinal spherical aberration diagram, an astigmatism diagram, and a distortion diagram of the optical system in the sixth embodiment;

[0054] Figure 13 A schematic diagram of a camera module provided in one embodiment of the present application;

[0055] Figure 14 A schematic diagram of an electronic device provided in accordance with an embodiment of the present application. DETAILED DESCRIPTION

[0056] To facilitate understanding of the present invention, the present invention will be described more fully below with reference to the accompanying drawings. The drawings illustrate preferred embodiments of the present invention. However, the present invention may be embodied 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 disclosure of the present invention.

[0057] It should be noted that when an element is referred to as being "fixed to" another component, it may be directly on the other component or there may be a central element. When an element is considered to be "connected to" another component, it may be directly connected to the other component or there may be a central element at the same time. In contrast, when an element is referred to as being "directly on" another component, there is no intermediate element. The terms "vertical," "horizontal," "left," "right," and similar expressions used herein are for illustrative purposes only.

[0058] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one skilled in the art to which this invention pertains. The terms used in this specification 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.

[0059] refer to Figure 1Some embodiments of the present application provide an optical system 10, which includes a first lens L1, an optical path deflecting element 110, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6 along an incident light path 102. The first lens L1 has positive refractive power, the second lens L2 has positive refractive power, the third lens L3 has positive or negative refractive power, the fourth lens L4 has positive or negative refractive power, the fifth lens L5 has negative refractive power, and the sixth lens L6 has negative refractive power. The optical axis of each lens in the optical system 10 is located on the incident light path 102, and the optical path deflecting element 110 is used to deflect light from the first lens L1, thereby deflecting the light path between the first lens L1 and the second lens L2. The above-mentioned elements in the optical system 10 can be installed in a lens barrel to form a lens.

[0060] The first lens L1 includes an object-side surface S1 and an image-side surface S2. The second lens L2 includes an object-side surface S3 and an image-side surface S4. The third lens L3 includes an object-side surface S5 and an image-side surface S6. The fourth lens L4 includes an object-side surface S7 and an image-side surface S8. The fifth lens L5 includes an object-side surface S9 and an image-side surface S10. The sixth lens L6 includes an object-side surface S11 and an image-side surface S12. In addition, the optical system 10 further includes a virtual imaging surface S13 located on the image side of the sixth lens L6. Generally, the imaging surface S13 of the optical system 10 coincides with the photosensitive surface of the photosensitive element.

[0061] Both the object side and the image side of the lens can be divided radially from the center of the surface into areas at the near axis and at the circumference. When describing a surface of a lens as convex at the near axis (the central area of the surface), it can be understood that the area of the surface of the lens near the optical axis is convex. When describing a surface of a lens as concave at the circumference, it can be understood that the area of the surface close to the maximum effective radius is concave. For example, when the surface is convex at the near axis and also convex at the circumference, the shape of the surface from the center (optical axis) to the edge direction can be purely convex, or it can first transition from a convex shape at the center to a concave shape, and then become convex when close to the maximum effective radius. This is only an example made to illustrate the relationship between the optical axis and the circumference. The various shape structures of the surface (concave-convex relationship) are not fully reflected, but other situations in some embodiments can be deduced based on the above examples, which will not be elaborated here.

[0062] In the above embodiment, the object-side surface S1 of the first lens element L1 is convex at the paraxial direction, and the image-side surface S2 is flat at the paraxial direction; the object-side surface S3 of the second lens element L2 is convex at the paraxial direction, and the image-side surface S4 is convex at the paraxial direction; the object-side surface S5 of the third lens element L3 is concave at the paraxial direction, and the image-side surface S6 is convex at the paraxial direction; the object-side surface S7 of the fourth lens element L4 is concave at the paraxial direction; and the object-side surface S9 of the fifth lens element L5 is convex at the paraxial direction, and the image-side surface S10 is concave at the paraxial direction.

[0063] The first lens L1 has positive refractive power, and its object-side surface S1 is convex near the optical axis, providing excellent light convergence and helping to reduce the aperture of the second lens L2. The second lens L2 also has positive refractive power, and its object-side surface S3 and image-side surface S4 are both convex near the optical axis, providing excellent light convergence and helping to shorten the system length. Meanwhile, the fifth and sixth lenses L5 and L6 have negative refractive power configurations, which can correct the system's spherical aberration, coma, and astigmatism, helping to improve the system's imaging quality.

[0064] In addition, in the above embodiment, the optical path refraction element 110 includes an incident surface 111, a reflective surface 112 and an exit surface 113. The image side surface S2 of the first lens L1 is glued to the incident surface 111 of the optical path refraction element 110. The reflective surface 112 of the optical path refraction element 110 is used to reflect the light from the first lens L1 to the exit surface 113, and the exit surface 113 faces the object side surface S3 of the second lens L2.

[0065] In the above embodiment, after the incident light beam passes through the first lens L1, it is incident on the light path refraction element 110 from the image side surface S2 of the first lens L1, and then the incident light beam is reflected by the reflection surface 112 of the light path refraction element 110 to the exit surface 113, and then exits from the exit surface 113 to the second lens L2.

[0066] In the aforementioned optical system 10, the optical path deflecting element 110 is used to deflect light from the first lens L1, thereby deflecting the incident light path of the optical system 10. This reduces the system's dimensions in the direction of the deflected optical path, i.e., shortens the system's longitudinal dimensions. Furthermore, by gluing the image-side surface S2 of the first lens L1 to the incident surface 111 of the optical path deflecting element 110, the optical axis of the first lens L1 and the optical axis of the rear lens group (composed of the second lens L2 through the sixth lens L6) are aligned in different directions. This effectively reduces the system's lateral aperture and the space it occupies, enabling better application in devices requiring high component miniaturization, particularly those with a relatively small thickness. In particular, since the first lens L1 is disposed on the incident surface 111 of the optical path deflecting element 110, the aperture of the first lens L1 can be prevented from affecting the aperture of the lens group after the optical path is deflected (composed of the second lens L2 to the sixth lens L6), which is beneficial for maintaining the aperture of the lens group after the optical path is deflected at a relatively small size, thereby reducing the limitation of the device thickness on the lens group after the optical path is deflected. For example, when the thickness of the device is relatively thin and the optical axis of the rear lens group of the system is perpendicular to the thickness direction of the device, the larger the aperture of the rear lens group, the more difficult it is to install in the device. And since the optical path deflecting element 110 is disposed between the lenses of the system, it can effectively increase the distance that the incident light travels through the lens group, which is beneficial for increasing the focal length of the optical system 10, so that the optical system 10 has a telephoto characteristic to achieve a telephoto effect.

[0067] In some embodiments, the object-side and / or image-side surfaces of at least one lens in the optical system 10 are aspherical. The aspherical design allows for more flexible design of the object-side and / or image-side surfaces of the lens, enabling good aberration correction even when the lens is small and thin. This eliminates the need for excessive lens configurations while maintaining good imaging quality and helps shorten the length of the optical system 10. Specifically, both the object-side and image-side surfaces of each lens in the optical system 10 can be aspherical. This aspherical design helps enhance the design flexibility of the system, optimizes the system's aberrations, and helps the optical system 10 maintain good imaging quality while maintaining its miniaturization. In other embodiments, both the object-side and image-side surfaces of each lens in the optical system 10 can be spherical. Spherical lenses offer a simple manufacturing process and low production cost. The specific configuration of the spherical and aspherical surfaces can be determined based on actual design requirements and will not be elaborated upon here. The combination of spherical and aspherical surfaces can effectively eliminate system aberrations, ensuring good imaging quality for the optical system 10 while also increasing the flexibility of lens design and assembly, allowing the system to achieve a balance between high image quality and low cost. It should be noted that the specific shapes of the spherical and aspherical surfaces in the embodiments are not limited to the shapes of the spherical and aspherical surfaces shown in the drawings, which are mainly for illustrative reference and are not drawn strictly to scale.

[0068] The calculation of the aspheric surface shape can refer to the aspheric surface formula:

[0069]

[0070] Among them, Z is the distance from the corresponding point on the aspheric surface to the plane tangent to the vertex of the surface, r is the distance from the corresponding point on the aspheric surface to the optical axis, c is the curvature of the aspheric vertex, k is the cone coefficient, and Ai is the coefficient corresponding to the i-th higher-order term in the aspheric surface shape formula.

[0071] In some embodiments, the light path deflection element 110 is a prism, specifically a triangular prism. When the light path deflection element 110 is a triangular prism, one right-angled surface of the prism serves as the incident surface 111, the inclined surface serves as the reflective surface 112, and the other right-angled surface serves as the exit surface 113. The triangular prism may be, but is not limited to, a right-angled triangular prism.

[0072] In some embodiments, the optical system 10 further satisfies at least one of the following relationships:

[0073] 1.5≤TTL / (ImgH*2)≤2.5; TTL is the distance along the optical axis from the object-side surface S3 of the second lens element L2 to the imaging surface S13 of the optical system 10, and ImgH is half the diagonal length of the imaging surface S13 within the effective imaging area of the optical system 10. Specifically, in some embodiments, TTL / (ImgH*2) may be 1.7, 1.75, 1.8, 1.85, 1.9, 2, 2.05, 2.1, or 2.15. When this relationship is met, the distance from the second lens element L2 to the imaging surface S13 and the size of the imaging surface S13 can be controlled within a relatively small range, thereby enabling a reasonable system layout and achieving a compact design.

[0074] 0.6≤DL / TTL≤0.8; DL is the distance on the optical axis from the object-side surface S3 of the second lens element L2 to the image-side surface S12 of the sixth lens element L6, and TTL is the distance on the optical axis from the object-side surface S3 of the second lens element L2 to the imaging surface S13 of the optical system 10. Specifically, in some embodiments, DL / TTL can be 0.65, 0.67, 0.69, 0.7, 0.71, 0.72, or 0.73. By achieving system miniaturization through a reasonable structural layout and further satisfying the above relationship, the space occupied by the lens assembly after the optical path is folded can be effectively reduced, thereby facilitating the layout of the module structure.

[0075] 12°≤HFOV≤18°; HFOV is half of the maximum field of view angle of the optical system 10 in the diagonal direction. Specifically, the HFOV in some embodiments may be 12.5°, 13°, 13.5°, 15°, 16°, 16.5°, 17°, or 17.5°. When the above relationship is met, the optical system 10 has a telephoto condition to achieve a telephoto effect. The diagonal direction of the optical system 10 can be understood as the diagonal direction of the effective imaging area of the imaging surface S13, and can also be understood as the diagonal direction of the rectangular photosensitive surface after the photosensitive element is assembled.

[0076] 0.9≤TTL / f≤1.2; TTL is the distance on the optical axis from the object-side surface S3 of the second lens L2 to the imaging surface S13 of the optical system 10, and f is the effective focal length of the optical system 10. Specifically, in some embodiments, TTL / f can be 0.95, 0.96, 0.97, 0.98, 0.99, or 1. When this relationship is met, and when HFOV ≤ 18°, the longitudinal dimension of the optical system 10 can be further shortened, facilitating a smaller lens height and thus facilitating application in miniaturized devices. The aspherical design facilitates controlling the relationship between TTL and f within the above range, keeping the ratio between the two within a relatively small range. Furthermore, when achieving the aforementioned telephoto effect, the aspherical design also facilitates balancing various aberrations in the system, such as chromatic aberration and spherical aberration, resulting in excellent imaging quality.

[0077] f 2-6 >0;f 2-6 is the combined focal length of each lens from the second lens L2 to the sixth lens L6. Specifically, in some embodiments, f 2-6 The values can be 6.5, 7, 7.5, 8, 10, 12, 14, 15, 16, 16.5, or 17, with the unit of value being mm. When the above relationship is satisfied, the lens group after the optical path folding can effectively balance and correct the aberrations produced by the first lens element L1, and facilitate the effective convergence of marginal light. At the same time, the system structure can be made more compact, effectively reducing the system size, thereby facilitating the realization of telephoto and miniaturization effects.

[0078] T45 / T56 ≤ 0.3; T45 is the distance along the optical axis from the image-side surface S8 of the fourth lens element L4 to the object-side surface S9 of the fifth lens element L5, and T56 is the distance along the optical axis from the image-side surface S10 of the fifth lens element L5 to the object-side surface S11 of the sixth lens element L6. Specifically, in some embodiments, T45 / T56 can be 0.085, 0.09, 0.1, 0.11, 0.12, 0.14, 0.145, or 0.15. When this relationship is met, the lens spacing between the fourth lens element L4 and the sixth lens element L6 can be optimally arranged, thereby reducing the longitudinal dimensions of the system. It also mitigates directional changes in light after entering the system, helping to reduce the intensity of stray light.

[0079] |f2 / f1|≤1; f1 is the focal length of the first lens element L1, and f2 is the focal length of the second lens element L2. Specifically, in some embodiments, |f2 / f1| can be 0.07, 0.075, 0.08, 0.085, 0.09, 0.095, or 0.1. When this relationship is satisfied, the refractive powers of the first lens element L1 and the second lens element L2 can be appropriately configured to balance the significant spherical aberration generated by the front lens group, improve the overall resolution of the optical system 10, control the refractive power configuration at the rear end of the system, enhance the correction of peripheral aberrations, and facilitate compactness, thereby contributing to a compact optical system 10.

[0080] |V2-V4|≥30; V2 is the Abbe number of the second lens element L2, and V4 is the Abbe number of the fourth lens element L4. Meeting this relationship is beneficial for correcting system chromatic aberration and ensuring good imaging quality.

[0081] In addition, in some embodiments, the object-side surface and / or image-side surface of at least one lens in the optical system 10 is aspherical. The aspherical design is conducive to improving the design flexibility of the system, optimizing the aberrations of the system, and helping the optical system 10 have good imaging quality while maintaining miniaturization. In particular, on the basis of satisfying the above-mentioned 0.9≤TTL / f≤1.2, the aspherical design of the lens is conducive to making the relationship between TTL and f easier to control within the above relationship, and maintaining it within a smaller ratio range. At the same time, when the system has telephoto performance, the aspherical design is also more conducive to balancing the system's chromatic aberration, spherical aberration and other aberrations, so that the system can obtain good imaging quality.

[0082] It should be noted that when any of the above relationships is satisfied, the optical system 10 can have the effects described by the corresponding relationship.

[0083] In some embodiments, the optical system 10 includes an aperture STO, which is disposed between any two optical elements along the incident light path 102. For example, the aperture STO can be disposed between two adjacent lenses or between the optical path deflecting element 110 and the second lens L2. In some embodiments, the aperture STO can also be disposed on the side of the first lens L1 away from the optical path deflecting element 110.

[0084] In some embodiments, all lenses in the optical system 10 are made of plastic. In other embodiments, all lenses in the optical system 10 can be made of glass. Plastic lenses can reduce the weight of the optical system 10 and lower manufacturing costs, while glass lenses can withstand higher temperatures and provide excellent optical performance. In other embodiments, the first lens L1 can be made of glass, while the other lenses can be made of plastic. In this case, the glass lens on the object side is highly resistant to extreme environments and is less susceptible to aging caused by the object side environment. This allows the optical system 10 to maintain excellent optical performance even in extreme environments such as high temperatures. Furthermore, the plastic material of the rear lens group can effectively reduce production costs, resulting in a design that effectively balances the system's optical performance and cost. Of course, the lens material configuration in the optical system 10 is not limited to the above embodiment; any lens can be made of either plastic or glass. The specific configuration depends on actual design requirements and is not detailed here.

[0085] In some embodiments, the optical system 10 includes an infrared filter 120, which is disposed on the image side of the sixth lens L6 and is fixed relative to each lens in the optical system 10. The infrared filter 120 is used to filter out infrared light, preventing it from reaching the imaging surface S13 of the system, thereby preventing infrared light from interfering with normal imaging. The infrared filter 120 can be assembled with each lens as part of the optical system 10. For example, in some embodiments, the lenses in the optical system 10 are mounted within a lens barrel, and the infrared filter 120 is mounted at the image end of the lens barrel. In other embodiments, the infrared filter 120 is not a component of the optical system 10. In this case, the infrared filter 120 can be installed between the optical system 10 and the photosensitive element when the optical system 10 and the photosensitive element are assembled into a camera module. In some embodiments, the infrared filter 120 can also be disposed on the object side of the first lens L1. In addition, in some embodiments, the infrared filter 120 may not be provided. Instead, an infrared filter film may be provided on the object-side surface or the image-side surface of one of the first lens L1 to the sixth lens L6 to filter out infrared light.

[0086] Next, the optical system 10 of the present application is described with more specific and detailed embodiments:

[0087] First embodiment

[0088] refer to Figure 1 In the first embodiment, the optical system 10 includes, along the incident light path 102, a first lens L1 with positive refractive power, an optical path deflecting element 110, an aperture STO, a second lens L2 with positive refractive power, a third lens L3 with negative refractive power, a fourth lens L4 with positive refractive power, a fifth lens L5 with negative refractive power, and a sixth lens L6 with negative refractive power. Figure 2 The diagrams include longitudinal spherical aberration, astigmatism, and distortion diagrams of the optical system 10 in the first embodiment. The reference wavelength of the astigmatism and distortion diagrams in the following embodiments (first to sixth embodiments) is 555 nm.

[0089] The object-side surface S1 of the first lens L1 is convex at the paraxial position, and the image-side surface S2 is flat at the paraxial position; the object-side surface S1 is convex at the circumference, and the image-side surface S2 is flat at the circumference.

[0090] The object-side surface S3 of the second lens L2 is convex at the paraxial position, and the image-side surface S4 is convex at the paraxial position; the object-side surface S3 is convex at the circumference, and the image-side surface S4 is convex at the circumference.

[0091] The object-side surface S5 of the third lens L3 is concave at the paraxial position, and the image-side surface S6 is convex at the paraxial position; the object-side surface S5 is concave at the circumference, and the image-side surface S6 is concave at the circumference.

[0092] The object-side surface S7 of the fourth lens L4 is concave at the paraxial position, and the image-side surface S8 is convex at the paraxial position; the object-side surface S7 is convex at the circumference, and the image-side surface S8 is concave at the circumference.

[0093] The object-side surface S9 of the fifth lens L5 is convex at the paraxial position, and the image-side surface S10 is concave at the paraxial position; the object-side surface S9 is convex at the circumference, and the image-side surface S10 is concave at the circumference.

[0094] The object-side surface S11 of the sixth lens L6 is convex at the paraxial position, and the image-side surface S12 is concave at the paraxial position; the object-side surface S11 is concave at the circumference, and the image-side surface S12 is convex at the circumference.

[0095] The first lens L1 has positive refractive power, and its object-side surface S1 is convex near the optical axis, providing excellent light convergence and helping to reduce the aperture of the second lens L2. The second lens L2 also has positive refractive power, and its object-side surface S3 and image-side surface S4 are both convex near the optical axis, providing excellent light convergence and helping to shorten the system length. Meanwhile, the fifth and sixth lenses L5 and L6 have negative refractive power configurations, which can correct the system's spherical aberration, coma, and astigmatism, helping to improve the system's imaging quality.

[0096] The object-side surface S1 of the first lens L1 and the object-side and image-side surfaces of the second through sixth lenses L2 through L6 are all aspherical. This aspherical design enhances lens design flexibility, allowing the lenses to maintain a compact size while still achieving excellent aberration correction. This contributes to the compact design and excellent imaging quality of the optical system 10, while also enhancing flexibility in lens design and assembly. Furthermore, the material of the first through sixth lenses L1 through L6 is plastic, effectively reducing the production cost of the optical system 10.

[0097] The optical path refraction element 110 is a right-angled prism, one of whose right-angled surfaces serves as the incident surface 111, the inclined surface serves as the reflective surface 112, and the other right-angled surface 113 serves as the exit surface 113. Both the incident surface 111 and the exit surface 113 are planes, and the image-side surface S2 of the first lens L1 is also plane. The image-side surface S2 of the first lens L1 is glued to the incident surface 111 of the optical path refraction element 110. The reflective surface 112 of the optical path refraction element 110 is used to reflect light from the first lens L1 to the exit surface 113, which faces the object-side surface S3 of the second lens L2. The optical path refraction element 110 is used to change the incident light path of the system so that the optical axis of the first lens L1 is perpendicular to the optical axis of the second lens L2.

[0098] In the first embodiment, the optical system 10 satisfies the following relationships:

[0099] TTL / (ImgH*2)=2.002; TTL is the distance along the optical axis from the object-side surface S3 of the second lens element L2 to the imaging surface S13 of the optical system 10, and ImgH is half the diagonal length of the imaging surface S13 within the effective imaging area of the optical system 10. When this relationship is satisfied, the distance from the second lens element L2 to the imaging surface S13 and the size of the imaging surface S13 can be kept within a relatively small range, thereby enabling a reasonable system layout and achieving a compact design.

[0100] DL / TTL = 0.652; DL is the distance along the optical axis from the object-side surface S3 of the second lens element L2 to the image-side surface S12 of the sixth lens element L6, and TTL is the distance along the optical axis from the object-side surface S3 of the second lens element L2 to the imaging surface S13 of the optical system 10. A reasonable structural layout, while achieving system miniaturization, further satisfying the above relationship can effectively reduce the space occupied by the lens assembly after the optical path is folded, thereby facilitating the layout of the module structure.

[0101] HFOV=13.2°; HFOV is half of the maximum field angle of the optical system 10 in the diagonal direction. When the above relationship is satisfied, the optical system 10 has a telephoto condition to achieve a telephoto effect.

[0102] TTL / f = 0.951; TTL is the distance on the optical axis from the object-side surface S3 of the second lens L2 to the imaging surface S13 of the optical system 10, and f is the effective focal length of the optical system 10. When this relationship is satisfied, and when HFOV ≤ 18°, the longitudinal dimension of the optical system 10 can be further shortened, facilitating a smaller lens height and thus facilitating application in miniaturized devices. Furthermore, the aspherical design of the lens makes it easier to control the relationship between TTL and f within the system within the aforementioned relationship, maintaining it within a relatively small ratio range. Furthermore, when the system achieves telephoto performance, the aspherical design also facilitates balancing various aberrations in the system, such as chromatic aberration and spherical aberration, resulting in excellent imaging quality.

[0103] f 2-6 =15.914mm; f 2-6 is the combined focal length of each lens from second lens L2 to sixth lens L6. When this relationship is satisfied, the lens group after optical path folding can effectively balance and correct aberrations produced by first lens L1, facilitate effective convergence of marginal light, and simultaneously make the system structure more compact, effectively reducing the system size, thereby facilitating telephoto and miniaturization.

[0104] T45 / T56 = 0.096; T45 is the distance along the optical axis from the image-side surface S8 of the fourth lens element L4 to the object-side surface S9 of the fifth lens element L5, and T56 is the distance along the optical axis from the image-side surface S10 of the fifth lens element L5 to the object-side surface S11 of the sixth lens element L6. When this relationship is met, the lens spacing between the fourth lens element L4 and the sixth lens element L6 can be optimally arranged, thereby reducing the longitudinal dimensions of the system. It also mitigates the directional changes of light entering the system, helping to reduce the intensity of stray light.

[0105] |f2 / f1|=0.093; f1 is the focal length of the first lens element L1, and f2 is the focal length of the second lens element L2. When this relationship is satisfied, the refractive powers of the first and second lenses L1 and L2 can be appropriately configured to balance the significant spherical aberration produced by the front lens group, improving the overall resolution of the optical system 10, controlling the refractive power configuration at the rear end of the system, and enhancing the correction of peripheral aberrations. This also facilitates compactness, contributing to a compact optical system 10.

[0106] |V2-V4|=34.61; V2 is the Abbe number of the second lens element L2, and V4 is the Abbe number of the fourth lens element L4. When the above relationship is satisfied, it is beneficial to correct the chromatic aberration of the system and ensure good imaging quality.

[0107] In addition, the lens parameters of optical system 10 are given in Tables 1 and 2. Table 2 lists the aspheric coefficients of the corresponding lens surfaces in Table 1, where K is the cone coefficient and Ai is the coefficient corresponding to the i-th higher-order term in the aspheric surface formula. The elements arranged along the incident light path are arranged in the order from top to bottom in Table 1. The imaging surface S13 can be understood as the photosensitive surface of the photosensitive element. Surface numbers 1 and 2 correspond to the object-side surface S1 and image-side surface S2 of the first lens L1, respectively. Surface numbers 9 and 10 correspond to the object-side surface S3 and image-side surface S4 of the second lens L2, respectively. That is, within the same lens, the surface with the smaller surface number is the object-side surface, the surface with the larger surface number is the image-side surface, and so on. The radius of curvature in Table 1 is the radius of curvature of the object-side or image-side surface of the corresponding surface number at the optical axis. The first value in the "Thickness" parameter column for a lens is the thickness of the lens on the optical axis, and the second value is the distance from the image-side surface of the lens to the object-side surface of the next optical element on the optical axis. The value of aperture ST0 in the "Thickness" parameter column is the distance from the center of aperture ST0 to the object-side surface of the next lens on the optical axis. Surface number 3 corresponds to incident surface 111 of optical path deflection element 110, surface number 4 corresponds to reflective surface 112, and surface number 5 corresponds to exit surface 113.

[0108] The reference wavelength for the refractive index and dispersion coefficient in the following embodiments is 587.56 nm, and the reference wavelength for the focal length is 555 nm. In addition, the relationship calculations and lens structures of each embodiment shall be based on the data in the parameter tables (such as Table 1 and Table 2) in the corresponding embodiment.

[0109] In the first embodiment, the effective focal length of the optical system 10 as a whole is f=12.36 mm; the aperture number FNO=2.4; the maximum diagonal viewing angle FOV=26.4°; TTL=11.75 mm, where TTL is the distance along the optical axis (longitudinal direction) from the object-side surface S3 of the second lens element L2 to the imaging surface S13 of the optical system 10; and half the diagonal length of the imaging surface S13 within the effective imaging area; Imgh=2.934 mm, where ImgH is half the diagonal length of the imaging surface S13 within the effective imaging area of the optical system 10; the maximum imaging circle diameter MIC=6.37 mm; and DL=7.66 mm, where DL is the distance along the optical axis (longitudinal direction) from the object-side surface S3 of the second lens element L2 to the image-side surface S12 of the sixth lens element L6.

[0110] Table 1

[0111]

[0112] In addition, the focal lengths of the lens groups formed by the lenses and some of the lenses in this embodiment are as follows:

[0113]

[0114] In the above table, f1 is the focal length of the first lens L1, f2 is the focal length of the second lens L2, f3 is the focal length of the third lens L3, f4 is the focal length of the fourth lens L4, f5 is the focal length of the fifth lens L5, f6 is the focal length of the sixth lens L6, f23 is the combined focal length of the second lens L2 and the third lens L3, f34 is the combined focal length of the third lens L3 and the fourth lens L4, f45 is the combined focal length of the fourth lens L4 and the fifth lens L5, f56 is the combined focal length of the fifth lens L5 and the sixth lens L6, and f 2-6 It is the combined focal length of the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5 and the sixth lens L6.

[0115] Table 2

[0116]

[0117]

[0118] Figure 2 The optical system 10 includes a longitudinal spherical aberration diagram (Longitudinal Spherical Aberration), which represents the deviation of the convergent focus of light rays of different wavelengths at the paraxial object point from the ideal image plane after passing through the optical system. The ordinate of the longitudinal spherical aberration diagram represents the normalized pupil coordinate (Normalized Pupil Coordinator) from the pupil center to the pupil edge, and the abscissa represents the deviation distance (in mm) between the light convergent image plane and the ideal image plane. As can be seen from the longitudinal spherical aberration diagram, the degree of deviation of the convergent focus of light rays of various wavelengths in the first embodiment and the deviation from the ideal image plane are within a very small range, and the spherical aberration in the imaging image and the chromatic aberration between different wavelengths are well corrected.

[0119] Figure 2 Also included are astigmatic field curves for the optical system 10, where the S curve represents sagittal field curvature and the T curve represents meridional field curvature. As can be seen from the figure, both sagittal and meridional field curvatures are kept within a relatively small range, reflecting that the curvature of the imaging surface is well controlled.

[0120] in addition, Figure 2 The figure also includes a distortion diagram of the optical system 10. As can be seen from the figure, the distortion of the optical system 10 is relatively small, which means that the image deformation caused by the main light beam is relatively small, and the imaging distortion effect is low.

[0121] Second embodiment

[0122] refer to Figure 3In the second embodiment, the optical system 10 includes, along the incident light path, a first lens L1 with positive refractive power, an optical path deflecting element 110, an aperture STO, a second lens L2 with positive refractive power, a third lens L3 with negative refractive power, a fourth lens L4 with negative refractive power, a fifth lens L5 with negative refractive power, and a sixth lens L6 with negative refractive power. Figure 4 Included are diagrams of longitudinal spherical aberration, astigmatism, and distortion of the optical system 10 in the second embodiment.

[0123] The object-side surface S1 of the first lens L1 is convex at the paraxial position, and the image-side surface S2 is flat at the paraxial position; the object-side surface S1 is convex at the circumference, and the image-side surface S2 is flat at the circumference.

[0124] The object-side surface S3 of the second lens L2 is convex at the paraxial position, and the image-side surface S4 is convex at the paraxial position; the object-side surface S3 is convex at the circumference, and the image-side surface S4 is convex at the circumference.

[0125] The object-side surface S5 of the third lens L3 is concave at the paraxial position, and the image-side surface S6 is convex at the paraxial position; the object-side surface S5 is concave at the circumference, and the image-side surface S6 is convex at the circumference.

[0126] The object-side surface S7 of the fourth lens L4 is concave at the paraxial position, and the image-side surface S8 is convex at the paraxial position; the object-side surface S7 is concave at the circumference, and the image-side surface S8 is concave at the circumference.

[0127] The object-side surface S9 of the fifth lens L5 is convex at the paraxial position, and the image-side surface S10 is concave at the paraxial position; the object-side surface S9 is convex at the circumference, and the image-side surface S10 is concave at the circumference.

[0128] The object-side surface S11 of the sixth lens L6 is convex at the paraxial position, and the image-side surface S12 is concave at the paraxial position; the object-side surface S11 is concave at the circumference, and the image-side surface S12 is convex at the circumference.

[0129] In addition, the parameters of each lens in the second embodiment are given in Table 3 and Table 4, wherein the definitions of each structure and parameter can be derived from the first embodiment and are not repeated here.

[0130] Table 3

[0131]

[0132]

[0133] In addition, the focal lengths of the lens groups formed by the lenses and some of the lenses in this embodiment are as follows:

[0134]

[0135] Table 4

[0136] Surface number 1 2 7 8 9 10 K -3.0166E+01 - -7.3328E-01 -5.2988E+01 -5.2426E+01 -2.9130E+01 A4 -7.6968E-20 - -1.3489E-03 -3.3264E-03 -2.9861E-03 -5.0905E-03 A6 6.1951E-20 - -3.8486E-04 -7.3905E-04 -4.5562E-04 8.2728E-06 A8 -7.5098E-21 - 1.1248E-05 -1.8062E-04 -2.7702E-04 -3.3342E-04 A10 2.4885E-22 - -7.3445E-06 4.1429E-05 5.5224E-05 5.3240E-05 Surface number 11 12 13 14 15 16 K -1.7514E+01 -7.4096E+01 3.3397E+00 3.7903E+00 4.1000E+01 8.2402E+00 A4 3.0274E-03 1.3564E-02 7.1845E-03 -3.5138E-02 -5.7508E-02 -3.9541E-02 A6 9.1843E-04 -2.7081E-03 -4.4466E-03 9.1533E-03 1.5677E-02 4.7168E-03 A8 -5.1701E-04 4.8381E-04 9.8908E-04 -3.0468E-03 -1.2250E-02 -9.7440E-04 A10 6.9085E-05 -1.1825E-05 -3.6146E-05 4.1006E-04 6.6336E-03 1.2153E-04 A12 -1.9933E-03 -9.4044E-06 A14 2.5566E-04 -1.7883E-07

[0137] The camera module 10 in this embodiment satisfies the following relationship:

[0138] TTL / (ImgH*2) 1.875 f26 11.502 HFOV 16.200 T45 / T56 0.139 DL / TTL 0.720 |f2 / f1| 0.074 TTL / f 1.089 |V2-V4| 34.610 f1 77.112

[0139] Depend on Figure 4 As can be seen from the aberration diagram in , the longitudinal spherical aberration, field curvature and distortion of the optical system 10 are all well controlled, so that the optical system 10 can have good imaging quality.

[0140] Third embodiment

[0141] refer to Figure 5 In the third embodiment, the optical system 10 includes, along the incident light path, a first lens L1 with positive refractive power, an optical path deflecting element 110, an aperture STO, a second lens L2 with positive refractive power, a third lens L3 with positive refractive power, a fourth lens L4 with negative refractive power, a fifth lens L5 with negative refractive power, and a sixth lens L6 with negative refractive power. Figure 6 Included are diagrams of longitudinal spherical aberration, astigmatism, and distortion of the optical system 10 in the third embodiment.

[0142] The object-side surface S1 of the first lens L1 is convex at the paraxial position, and the image-side surface S2 is flat at the paraxial position; the object-side surface S1 is convex at the circumference, and the image-side surface S2 is flat at the circumference.

[0143] The object-side surface S3 of the second lens L2 is convex at the paraxial position, and the image-side surface S4 is convex at the paraxial position; the object-side surface S3 is convex at the circumference, and the image-side surface S4 is convex at the circumference.

[0144] The object-side surface S5 of the third lens L3 is concave at the paraxial position, and the image-side surface S6 is convex at the paraxial position; the object-side surface S5 is concave at the circumference, and the image-side surface S6 is convex at the circumference.

[0145] The object-side surface S7 of the fourth lens L4 is concave at the paraxial position, and the image-side surface S8 is convex at the paraxial position; the object-side surface S7 is concave at the circumference, and the image-side surface S8 is concave at the circumference.

[0146] The object-side surface S9 of the fifth lens L5 is convex at the paraxial position, and the image-side surface S10 is concave at the paraxial position; the object-side surface S9 is convex at the circumference, and the image-side surface S10 is concave at the circumference.

[0147] The object-side surface S11 of the sixth lens L6 is convex at the paraxial position, and the image-side surface S12 is concave at the paraxial position; the object-side surface S11 is concave at the circumference, and the image-side surface S12 is convex at the circumference.

[0148] In addition, the parameters of each lens in the third embodiment are given in Table 5 and Table 6, wherein the definitions of each structure and parameter can be obtained from the first embodiment and are not repeated here.

[0149] Table 5

[0150]

[0151] In addition, the focal lengths of the lens groups formed by the lenses and some of the lenses in this embodiment are as follows:

[0152]

[0153]

[0154] Table 6

[0155] Surface number 1 2 7 8 9 10 K -4.5084E+00 - -9.2896E-01 -4.5376E+01 -4.9882E+01 -4.4503E+01 A4 -2.3399E-06 - -1.5574E-03 -8.3507E-04 -1.6929E-03 -1.6087E-03 A6 3.3898E-09 - -3.6101E-04 -3.2965E-03 -2.7813E-03 -2.5326E-03 A8 3.3354E-12 - -5.0809E-06 6.6812E-04 6.3317E-04 4.2005E-04 A10 -1.9581E-15 - -5.0185E-06 -5.3583E-05 -5.6338E-05 -2.2564E-05 Surface number 11 12 13 14 15 16 K -1.7969E+01 -8.8048E+01 5.0733E+00 4.0953E+00 9.8317E+01 1.0706E+01 A4 6.6423E-03 8.2074E-03 1.7885E-05 -3.7223E-02 -7.4412E-02 -6.0160E-02 A6 -1.9615E-03 7.6842E-04 5.7191E-04 9.5059E-03 2.3792E-02 1.6225E-02 A8 2.7166E-04 -3.3802E-04 4.9616E-05 -2.9425E-03 -2.0050E-02 -7.5100E-03 A10 -4.8867E-06 5.0733E-05 3.5113E-05 4.3459E-04 1.2689E-02 2.7995E-03 A12 -4.2349E-03 -6.0788E-04 A14 6.0802E-04 5.4759E-05

[0156] The camera module 10 in this embodiment satisfies the following relationship:

[0157] TTL / (ImgH*2) 2.03 f26 6.417 HFOV 13.2 T45 / T56 0.107 DL / TTL 0.663 |f2 / f1| 0.1 TTL / f 0.964 |V2-V4| 34.61 f1 64.381

[0158] Depend on Figure 6 As can be seen from the aberration diagram in , the longitudinal spherical aberration, field curvature and distortion of the optical system 10 are all well controlled, so that the optical system 10 can have good imaging quality.

[0159] Fourth embodiment

[0160] refer to Figure 7 In the fourth embodiment, the optical system 10 includes, along the incident light path, a first lens L1 with positive refractive power, an optical path deflecting element 110, an aperture STO, a second lens L2 with positive refractive power, a third lens L3 with positive refractive power, a fourth lens L4 with negative refractive power, a fifth lens L5 with negative refractive power, and a sixth lens L6 with negative refractive power. Figure 8 Included are diagrams of longitudinal spherical aberration, astigmatism, and distortion of the optical system 10 in the fourth embodiment.

[0161] The object-side surface S1 of the first lens L1 is convex at the paraxial position, and the image-side surface S2 is flat at the paraxial position; the object-side surface S1 is convex at the circumference, and the image-side surface S2 is flat at the circumference.

[0162] The object-side surface S3 of the second lens L2 is convex at the paraxial position, and the image-side surface S4 is convex at the paraxial position; the object-side surface S3 is convex at the circumference, and the image-side surface S4 is convex at the circumference.

[0163] The object-side surface S5 of the third lens L3 is concave at the paraxial position, and the image-side surface S6 is convex at the paraxial position; the object-side surface S5 is concave at the circumference, and the image-side surface S6 is convex at the circumference.

[0164] The object-side surface S7 of the fourth lens L4 is concave at the paraxial position, and the image-side surface S8 is convex at the paraxial position; the object-side surface S7 is concave at the circumference, and the image-side surface S8 is concave at the circumference.

[0165] The object-side surface S9 of the fifth lens L5 is convex at the paraxial position, and the image-side surface S10 is concave at the paraxial position; the object-side surface S9 is convex at the circumference, and the image-side surface S10 is concave at the circumference.

[0166] The object-side surface S11 of the sixth lens L6 is convex at the paraxial position, and the image-side surface S12 is concave at the paraxial position; the object-side surface S11 is concave at the circumference, and the image-side surface S12 is convex at the circumference.

[0167] In addition, the lens parameters in the fourth embodiment are given in Table 7 and Table 8, wherein the definitions of the various structures and parameters can be derived from the first embodiment and are not repeated here.

[0168] Table 7

[0169]

[0170] In addition, the focal lengths of the lens groups formed by the lenses and some of the lenses in this embodiment are as follows:

[0171] Table 8

[0172] Surface number 1 2 7 8 9 10 K 9.2217E+00 - -5.2474E-01 -5.2370E+01 -5.4563E+01 -3.7353E+01 A4 3.8587E-14 - -1.4786E-03 -7.7823E-04 -2.0717E-03 -2.0128E-03 A6 3.1267E-20 - -2.5635E-04 -2.9492E-03 -2.2847E-03 -1.8117E-03 A8 -8.1211E-22 - -6.1285E-06 5.2165E-04 4.3919E-04 2.6867E-04 A10 -5.3196E-23 - -2.2659E-06 -3.2376E-05 -3.0164E-05 -1.2807E-05 Surface number 11 12 13 14 15 16 K -1.7048E+01 -6.1649E+01 4.8424E+00 3.8699E+00 -9.9000E+01 1.4910E+01 A4 6.0808E-03 1.2455E-02 3.6251E-03 -3.3661E-02 -5.8452E-02 -4.6079E-02 A6 -2.0417E-03 -3.3210E-03 -3.0763E-03 7.6965E-03 1.1537E-02 7.4183E-03 A8 3.1268E-04 8.1406E-04 1.0640E-03 -2.1702E-03 -7.6179E-03 -1.7081E-03 A10 -1.2540E-05 -4.9947E-05 -4.3298E-05 2.6524E-04 4.6027E-03 4.0947E-04 A12 -1.5257E-03 -8.3303E-05 A14 2.1630E-04 7.9703E-06

[0173] The camera module 10 in this embodiment satisfies the following relationship:

[0174] TTL / (ImgH*2) 2.156 f26 15.885 HFOV 12.850 T45 / T56 0.095 DL / TTL 0.664 |f2 / f1| 0.087 TTL / f 0.984 |V2-V4| 34.610 f1 76.366

[0175] Depend on Figure 8 As can be seen from the aberration diagram in , the longitudinal spherical aberration, field curvature and distortion of the optical system 10 are all well controlled, so that the optical system 10 can have good imaging quality.

[0176] Fifth embodiment

[0177] refer to Figure 9 In the fifth embodiment, the optical system 10 includes, along the incident light path, a first lens L1 with positive refractive power, an optical path deflecting element 110, an aperture STO, a second lens L2 with positive refractive power, a third lens L3 with negative refractive power, a fourth lens L4 with positive refractive power, a fifth lens L5 with negative refractive power, and a sixth lens L6 with negative refractive power. Figure 10 Included are diagrams of longitudinal spherical aberration, astigmatism, and distortion of the optical system 10 in the fifth embodiment.

[0178] The object-side surface S1 of the first lens L1 is convex at the paraxial position, and the image-side surface S2 is flat at the paraxial position; the object-side surface S1 is convex at the circumference, and the image-side surface S2 is flat at the circumference.

[0179] The object-side surface S3 of the second lens L2 is convex at the paraxial position, and the image-side surface S4 is convex at the paraxial position; the object-side surface S3 is convex at the circumference, and the image-side surface S4 is convex at the circumference.

[0180] The object-side surface S5 of the third lens L3 is concave at the paraxial position, and the image-side surface S6 is convex at the paraxial position; the object-side surface S5 is concave at the circumference, and the image-side surface S6 is concave at the circumference.

[0181] The object-side surface S7 of the fourth lens L4 is concave at the paraxial position, and the image-side surface S8 is convex at the paraxial position; the object-side surface S7 is convex at the circumference, and the image-side surface S8 is concave at the circumference.

[0182] The object-side surface S9 of the fifth lens L5 is convex at the paraxial position, and the image-side surface S10 is concave at the paraxial position; the object-side surface S9 is convex at the circumference, and the image-side surface S10 is concave at the circumference.

[0183] The object-side surface S11 of the sixth lens L6 is convex at the paraxial position, and the image-side surface S12 is concave at the paraxial position; the object-side surface S11 is concave at the circumference, and the image-side surface S12 is convex at the circumference.

[0184] In addition, the lens parameters in the fifth embodiment are given in Tables 9 and 10, wherein the definitions of the various structures and parameters can be derived from the first embodiment and are not repeated here.

[0185] Table 9

[0186]

[0187]

[0188] In addition, the focal lengths of the lens groups formed by the lenses and some of the lenses in this embodiment are as follows:

[0189]

[0190] Table 10

[0191] Surface number 1 2 7 8 9 10 K -2.4107E+01 - -1.0924E+00 -2.4164E+01 -1.7008E+01 -9.9000E+01 A4 -1.9204E-04 - -1.4149E-03 -5.4374E-03 9.1847E-03 2.0915E-02 A6 -5.5927E-06 - -3.6672E-04 -1.6086E-03 -5.0851E-03 -9.7505E-03 A8 6.4535E-08 - 7.9164E-06 4.8282E-04 1.1403E-03 2.7312E-03 A10 -1.5697E-10 - -1.6376E-05 -4.6233E-05 -8.2471E-05 -2.8244E-04 Surface number 11 12 13 14 15 16 K -7.8050E+01 -9.7743E+01 3.6816E+00 3.2939E+00 7.3567E+01 7.1451E+00 A4 7.2748E-03 1.0500E-02 1.2511E-02 -1.6709E-02 -3.4439E-02 -2.2674E-02 A6 -2.0395E-03 -1.8261E-03 -6.2756E-03 1.7956E-03 2.9212E-03 -3.9963E-04 A8 1.2367E-03 2.4348E-04 1.0622E-03 -1.0791E-03 -3.7913E-03 6.1576E-04 A10 -1.5775E-04 1.4592E-05 -3.6606E-05 8.2927E-05 2.4681E-03 -2.6373E-04 A12 -9.3338E-04 4.6810E-05 A14 1.4014E-04 -3.7054E-06

[0192] The camera module 10 in this embodiment satisfies the following relationship:

[0193] TTL / (ImgH*2) 1.67 f26 10.496 HFOV 17.5 T45 / T56 0.151 DL / TTL 0.739 |f2 / f1| 0.068 TTL / f 1.057 |V2-V4| 34.61 f1 78.864

[0194] Depend on Figure 10As can be seen from the aberration diagram in , the longitudinal spherical aberration, field curvature and distortion of the optical system 10 are all well controlled, so that the optical system 10 can have good imaging quality.

[0195] Sixth embodiment

[0196] refer to Figure 11 In the sixth embodiment, the optical system 10 includes, along the incident light path, a first lens L1 with positive refractive power, an optical path deflecting element 110, an aperture STO, a second lens L2 with positive refractive power, a third lens L3 with negative refractive power, a fourth lens L4 with positive refractive power, a fifth lens L5 with negative refractive power, and a sixth lens L6 with negative refractive power. Figure 12 Included are diagrams of longitudinal spherical aberration, astigmatism, and distortion of the optical system 10 in the sixth embodiment.

[0197] The object-side surface S1 of the first lens L1 is convex at the paraxial position, and the image-side surface S2 is flat at the paraxial position; the object-side surface S1 is convex at the circumference, and the image-side surface S2 is flat at the circumference.

[0198] The object-side surface S3 of the second lens L2 is convex at the paraxial position, and the image-side surface S4 is convex at the paraxial position; the object-side surface S3 is convex at the circumference, and the image-side surface S4 is convex at the circumference.

[0199] The object-side surface S5 of the third lens L3 is concave at the paraxial position, and the image-side surface S6 is convex at the paraxial position; the object-side surface S5 is concave at the circumference, and the image-side surface S6 is concave at the circumference.

[0200] The object-side surface S7 of the fourth lens L4 is concave at the paraxial position, and the image-side surface S8 is convex at the paraxial position; the object-side surface S7 is convex at the circumference, and the image-side surface S8 is concave at the circumference.

[0201] The object-side surface S9 of the fifth lens L5 is convex at the paraxial position, and the image-side surface S10 is concave at the paraxial position; the object-side surface S9 is convex at the circumference, and the image-side surface S10 is concave at the circumference.

[0202] The object-side surface S11 of the sixth lens L6 is convex at the paraxial position, and the image-side surface S12 is concave at the paraxial position; the object-side surface S11 is concave at the circumference, and the image-side surface S12 is convex at the circumference.

[0203] In addition, the lens parameters in the sixth embodiment are given in Table 11 and Table 12, wherein the definitions of the various structures and parameters can be derived from the first embodiment and are not repeated here.

[0204] Table 11

[0205]

[0206] In addition, the focal lengths of the lens groups formed by the lenses and some of the lenses in this embodiment are as follows:

[0207]

[0208] Table 12

[0209]

[0210]

[0211] The camera module 10 in this embodiment satisfies the following relationship:

[0212] TTL / (ImgH*2) 2.127 f26 17.063 HFOV 12.500 T45 / T56 0.083 DL / TTL 0.649 |f2 / f1| 0.091 TTL / f 0.946 |V2-V4| 34.610 f1 68.835

[0213] Depend on Figure 12 As can be seen from the aberration diagram in , the longitudinal spherical aberration, field curvature and distortion of the optical system 10 are all well controlled, so that the optical system 10 can have good imaging quality.

[0214] refer to Figure 13 Some embodiments of the present application further provide a camera module 20, comprising the optical system 10 of any of the above embodiments and a photosensitive element 210, wherein the photosensitive element 210 is disposed on the image side of the optical system 10. The photosensitive element 210 may be a CCD (Charge Coupled Device) or a CMOS (Complementary Metal Oxide Semiconductor). Generally, during assembly, the photosensitive surface of the photosensitive element 210 overlaps with the imaging surface S13 of the optical system 10.

[0215] In some embodiments, the camera module 20 includes an infrared filter 120 disposed between the fourth lens L4 and the photosensitive element 210. The infrared filter 120 is used to filter out infrared light. In some embodiments, the infrared filter 120 can be mounted to the image end of the lens.

[0216] By adopting the above-mentioned optical system 10, the size of the camera module 20 can be effectively reduced, so that the module can be installed in a device with a relatively thin thickness. In addition, it is also beneficial for the camera module 10 to have a telephoto characteristic to achieve a telephoto effect.

[0217] refer to Figure 14Some embodiments of the present application further provide an electronic device 30, in which the camera module 20 is assembled. Specifically, the electronic device 30 includes a fixing part 310, and the camera module 20 is installed on the fixing part 310. The fixing part 310 may be a circuit board, a middle frame, a bracket or other components. The electronic device 30 may be, but is not limited to, a smart phone, a smart watch, an e-book reader, a vehicle-mounted camera device, a monitoring device, a medical device (such as an endoscope), a tablet computer, a biometric device (such as a fingerprint recognition device or a pupil recognition device, etc.), a PDA (Personal Digital Assistant), a drone, etc. By adopting the above-mentioned camera module 20, the thickness of the electronic device 30 can be made smaller, and the miniaturization design will not be restricted due to the excessive length of the lens. In addition, it is also beneficial for the electronic device 30 to have telephoto performance.

[0218] 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.

[0219] 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 system, characterized in that: There are six lenses with refractive power, each of which is made of plastic or glass. Along the incident light path, they include: a first lens having positive refractive power, wherein the object-side surface of the first lens is convex at the paraxial position and the image-side surface of the first lens is flat at the paraxial position; an optical path deflecting element, comprising an incident surface, a reflecting surface, and an exit surface, wherein the image side surface of the first lens is glued to the incident surface, and the reflecting surface is used to reflect light from the first lens to the exit surface; a second lens having positive refractive power, wherein the object-side surface of the second lens is convex at the paraxial position, the image-side surface is also convex at the paraxial position, and the exit surface of the optical path deflecting element faces the object-side surface of the second lens; a third lens having refractive power, wherein the object-side surface of the third lens is concave at the paraxial position and the image-side surface of the third lens is convex at the paraxial position; a fourth lens having refractive power, wherein the object-side surface of the fourth lens is concave at the paraxial position; a fifth lens element having negative refractive power, wherein the object-side surface of the fifth lens element is convex at the paraxial direction and the image-side surface of the fifth lens element is concave at the paraxial direction; and The sixth lens element has negative refractive power.

2. The optical system according to claim 1, wherein: The following relationship is satisfied: 1.67≤TTL / (ImgH 2)≤2.15; TTL is the distance from the object side of the second lens to the imaging plane of the optical system on the optical axis, and ImgH is half of the diagonal length of the imaging plane of the optical system in the effective imaging area.

3. The optical system according to claim 2, wherein: The following relationship is satisfied: 0.6≤DL / TTL≤0.8; DL is the distance from the object side surface of the second lens to the image side surface of the sixth lens on the optical axis, and TTL is the distance from the object side surface of the second lens to the imaging plane of the optical system on the optical axis.

4. The optical system according to claim 1, wherein The following relationship is satisfied: 12°≤HFOV≤18°; HFOV is half of the maximum field of view of the optical system in the diagonal direction.

5. The optical system according to claim 4, wherein: The following relationship is satisfied: 0.9≤TTL / f≤1.089; TTL is the distance from the object side of the second lens to the imaging plane of the optical system on the optical axis, and f is the effective focal length of the optical system.

6. The optical system according to claim 1 or 5, characterized in that The object-side surface and / or the image-side surface of at least one lens in the optical system is aspherical.

7. The optical system according to claim 1, wherein: The following relationship is satisfied: f 2-6 ＞0； f 2-6 is the combined focal length of each lens from the second lens to the sixth lens.

8. The optical system according to claim 1, wherein: The following relationship is satisfied: 0.083≤T45 / T56≤0.15; T45 is the distance on the optical axis from the image side surface of the fourth lens to the object side surface of the fifth lens, and T56 is the distance on the optical axis from the image side surface of the fifth lens to the object side surface of the sixth lens.

9. The optical system according to claim 1, wherein: The following relationship is satisfied: |f2 / f1|≤0.1; f1 is the focal length of the first lens, and f2 is the focal length of the second lens.

10. The optical system according to claim 1, wherein: The following relationship is satisfied: |V2-V4|≥30; V2 is the Abbe number of the second lens element, and V4 is the Abbe number of the fourth lens element.

11. A camera module, characterized in that: The optical system comprises a photosensitive element and any one of claims 1 to 10, wherein the photosensitive element is arranged on the image side of the optical system.

12. An electronic device, characterized in that: It comprises a fixing part and the camera module according to claim 11, wherein the camera module is arranged on the fixing part.

Images