Optical systems, camera modules and terminal equipment

Abstract

This application discloses an optical system, a camera module, and a terminal device. The object-side surface of the first lens is convex near the optical axis. Light rays emitted from the first lens enter the first prism from the first incident surface, are reflected by the first reflecting surface, and exit from the first exit surface. The object-side surface of the second lens is convex near the optical axis, and the image-side surface of the second lens is concave near the optical axis. The object-side surface of the third lens is convex near the optical axis. The object-side surface of the fourth lens is concave near the optical axis, and the image-side surface of the fourth lens is convex near the optical axis. The object-side surface of the fifth lens is convex near the optical axis, and the image-side surface of the fifth lens is concave near the optical axis. The object-side surface and the image-side surface of the sixth lens are both concave near the optical axis. Light rays emitted from the sixth lens are transmitted from the second incident surface into the second prism, reflected by the second reflecting surface to the third reflecting surface, reflected by the third reflecting surface to the second reflecting surface, and transmitted through the second reflecting surface to the imaging surface of the optical system.

Description

Technical Field

[0001] This application relates to the field of optical imaging technology, and in particular to an optical system, camera module and terminal device. Background Technology

[0002] To adapt to the trend of thinner and lighter camera modules, a prism with reflection properties has been introduced into the optical system, so that the imaging surface of the image sensor is perpendicular to the incident direction of light, effectively reducing the thickness of the optical system in the incident direction of light.

[0003] However, the rapid advancements in optical imaging technology have led to a continuous increase in the size of image sensors, and the thickness of optical systems in the direction of light incidence has also increased. This has made it difficult for optical systems to meet the design requirements of thinner and lighter camera modules. Summary of the Invention

[0004] This application provides an optical system, a camera module, and a terminal device that can meet the requirements of high-quality optical performance while also taking into account the need for miniaturized design.

[0005] To achieve the above objectives, in a first aspect, this application discloses an optical system comprising six lenses with refractive power, the optical system comprising, along the optical path from the object side to the image side, the following:

[0006] The first lens has positive refractive power, and the object side of the first lens is convex near the optical axis;

[0007] The first prism includes a first incident surface, a first reflecting surface, and a first exiting surface in sequence along the optical path. Light rays emitted from the first lens enter the first prism from the first incident surface, are reflected by the first reflecting surface, and exit from the first exiting surface.

[0008] The second lens has negative refractive power, the object side of the second lens is convex near the optical axis, and the image side of the second lens is concave near the optical axis.

[0009] The third lens has positive refractive power, and the object side of the third lens is convex near the optical axis;

[0010] The fourth lens has negative refractive power, the object side of the fourth lens is concave near the optical axis, and the image side of the fourth lens is convex near the optical axis.

[0011] The fifth lens has positive refractive power, the object side of the fifth lens is convex near the optical axis, and the image side of the fifth lens is concave near the optical axis.

[0012] The sixth lens has negative refractive power, and both the object-side and image-side surfaces of the sixth lens are concave near the optical axis.

[0013] The second prism includes a second incident surface, a second reflecting surface, and a third reflecting surface in sequence along the optical path. The light emitted from the sixth lens is transmitted from the second incident surface into the second prism, reflected by the second reflecting surface to the third reflecting surface, reflected by the third reflecting surface to the second reflecting surface, and transmitted through the second reflecting surface to the imaging surface of the optical system.

[0014] The optical system satisfies the following relationship:

[0015] 27.6deg < FOV < 29deg and 1.9 < FNO < 2.7;

[0016] Wherein, FOV is the maximum field of view of the optical system, and FNO is the aperture number of the optical system.

[0017] To meet the requirements of high pixel count and miniaturization, the first lens is configured with positive refractive power, and its object-side surface is convex near the optical axis, which effectively increases the field of view and couples more light into the optical system. Simultaneously, a first prism is placed between the first and second lenses. This prism allows light rays exiting the first lens to enter through the first incident surface, be reflected by the first reflecting surface, and exit through the first exit surface, thus reducing the thickness of the optical system in the incident light direction. The second lens is configured with negative refractive power, and... The design of the object-side and image-side lenses, with convex and concave surfaces near the optical axis respectively, facilitates aberration correction and improves the imaging quality of the optical system. The third lens, with positive refractive power and a convex object-side surface near the optical axis, helps delay the light rays entering the optical system, correcting spherical aberration, coma, and distortion produced by the front lenses. It also reduces the incident angle of the incident light after passing through the aperture stop, allowing more light to couple into the optical system and improving the relative illumination. The fourth lens, with negative refractive power, complements the object-side and image-side surfaces... The design of the first lens with concave and convex surfaces near the optical axis allows light passing through it to be further coupled into the optical system. The fifth lens, with its positive refractive power and convex and concave surfaces near the optical axis on both its object and image sides, helps to concentrate light rays and reduce the overall length of the optical system. The sixth lens, with its negative refractive power and concave surfaces near the optical axis on both its object and image sides, combined with the positive refractive power of the fifth lens, helps to eliminate chromatic aberration, correct astigmatism, improve resolution, and reduce the light deflection angle, thus lowering the sensitivity of the optical system. A second prism is placed between the sixth lens and the imaging surface of the optical system. The light emitted from the sixth lens enters the second prism from the second incident surface, is reflected by the second reflecting surface to the third reflecting surface, is reflected by the third reflecting surface to the second reflecting surface, and is transmitted through the second reflecting surface to the imaging surface of the optical system. In other words, the second prism can be used to fold the light, thereby achieving multiple reflections of the light path within a limited thickness range. While achieving high-quality optical imaging, it is also beneficial to further reduce the thickness of the optical system along the incident direction of the light, and realize the miniaturization design of the optical system.

[0018] The optical system satisfies the relationship 27.6deg≤FOV≤29deg. By reasonably setting the maximum field of view of the optical system, a sufficient field of view can be provided to meet the large field of view requirements of the optical system.

[0019] The optical system satisfies the relation 1.9≤FNO≤2.7. By constraining the aperture number of the optical system, the light transmission capability of the optical system can be improved, resulting in higher relative illumination. This allows the optical system to have good imaging quality even in dark environments such as at night or on rainy days, meeting the requirements of large aperture and high resolution.

[0020] As an optional implementation manner, the second incident surface is connected between the second reflection surface and the third reflection surface. The second reflection surface is disposed close to and parallel to the imaging surface of the optical system. The included angle α between the imaging surface and the optical axis of the first lens satisfies: 48° < α < 60°.

[0021] By setting an included angle between the imaging surface and the optical axis of the first lens, when the optical system is applied to a camera module, the image sensor of the camera module can be inclined with respect to the optical axis of the first lens, thereby thinning the thickness of the camera module in the direction of the optical axis of the first lens, and thus facilitating the miniaturization design of the terminal device.

[0022] As an optional implementation manner, the optical system satisfies the following relational expressions: 7 < TTL / ImgH < 7.8, and / or, 0.85 < SD10 / SD1 < 1.05;

[0023] Where, TTL is the distance from the object side surface of the first lens to the imaging surface on the near optical axis, ImgH is half of the image height corresponding to the maximum field angle of the optical system, SD10 is half of the maximum effective aperture of the image side surface of the fifth lens, and SD1 is half of the maximum effective aperture of the object side surface of the first lens.

[0024] The optical system satisfies the relational expression 7 < TTL / ImgH < 7.8. By controlling the ratio of the total length of the optical system to the half image height of the optical system, it is beneficial to control the overall thickness and overall height of the optical system, and thus beneficial to the miniaturization design of the optical system.

[0025] The optical system satisfies the relational expression 0.85 < SD10 / SD1 < 1.05. By controlling the effective half apertures of the first lens and the fifth lens, it is beneficial to avoid a large step structure between the first lens and the fifth lens, thereby facilitating the constraint of the light path of the optical system and also beneficial to providing the assembly stability of the optical system.

[0026] As an optional implementation manner, the optical system satisfies the following relational expressions: 2.4 < f1 / f < 2.8, and / or, -1 < f2 / f < -0.8, and / or, 0.4 < f3 / f < 0.5, and / or, -2.9 < f4 / f < -2.4, and / or, 2.2 < f5 / f < 2.8, and / or, -11 < f6 / f < -4;

[0027] Where, f is the focal length of the optical system, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens; f5 is the focal length of the fifth lens; f6 is the focal length of the sixth lens.

[0028] When the optical system satisfies the above relationship, by reasonably controlling the ratio of each lens to the focal length of the optical system, the refractive power distribution of each lens in the optical system is made appropriate, which is beneficial to reducing the generation of aberrations and avoiding problems in image correction of the optical system caused by excessive change in the refractive power of a certain lens.

[0029] As an optional implementation manner, the optical system satisfies the following relationships: 2 < R1 / f < 2.3, and / or, 20 < R2 / f, and / or, 3.33 < f / R3 < 3.7, and / or, 5.56 < f / R4 < 6.67, and / or, 0.2 < R5 / f < 0.3, and / or, 10 < |R6| / f, and / or, -0.4 < R7 / f < -0.3, and / or, -0.5 < R8 / f < -0.4, and / or, 0.25 < R9 / f < 0.28, and / or, 0.28 < R10 / f < 0.32, and / or, -7 < R11 / f < -2, and / or, 30 < R12 / f;

[0030] Wherein, R1 is the curvature radius of the object side surface of the first lens on the optical axis, R2 is the curvature radius of the image side surface of the first lens on the optical axis, R3 is the curvature radius of the object side surface of the second lens on the optical axis, R4 is the curvature radius of the image side surface of the second lens on the optical axis, R5 is the curvature radius of the object side surface of the third lens on the optical axis, R6 is the curvature radius of the image side surface of the third lens on the optical axis, R7 is the curvature radius of the object side surface of the fourth lens on the optical axis, R8 is the curvature radius of the image side surface of the fourth lens on the optical axis, R9 is the curvature radius of the object side surface of the fifth lens on the optical axis, R10 is the curvature radius of the image side surface of the fifth lens on the optical axis, R11 is the curvature radius of the object side surface of the sixth lens on the optical axis, and R12 is the curvature radius of the image side surface of the sixth lens on the optical axis.

[0031] When the optical system satisfies the above relationship, by reasonably configuring the ratio of the curvature radius of each lens to the focal length of the optical system, the refractive power distribution of each lens can be made uniform and reasonable, the aberrations of the optical system are easy to correct, and the image quality is good.

[0032] As an optional implementation manner, the optical system satisfies the following relationships: 0.4 < CT1 / CT2 < 0.53, and / or, 1.4 < CT2 / CT3 < 1.7, and / or, 0.7 < CT3 / CT4 < 0.8, and / or, 1.4 < CT4 / CT5 < 1.6, and / or, 1.6 < CT5 / CT6 < 1.8;

[0033] Where CT1 is the thickness of the first lens on the optical axis; CT2 is the thickness of the second lens on the optical axis; CT3 is the thickness of the third lens on the optical axis; CT4 is the thickness of the fourth lens on the optical axis; CT5 is the thickness of the fifth lens on the optical axis; CT6 is the thickness of the sixth lens on the optical axis.

[0034] When the optical system satisfies the above relationship, by reasonably controlling the central thickness of each lens, it is convenient to control the optical power of each lens, so that the aberrations of each lens can compensate each other, reduce the aberration of the optical system, and is beneficial to improving the imaging quality of the optical system.

[0035] As an optional implementation manner, the optical system satisfies the following relationship: 3.5 < AT23 / AT34 < 4.7, and / or, 0.7 < AT56 / (CT5 + CT6) < 1.1;

[0036] Where AT23 is the distance on the optical axis from the image side of the second lens to the object side of the third lens, AT34 is the distance on the optical axis from the image side of the third lens to the object side of the fourth lens, AT56 is the distance on the optical axis between the image side of the fifth lens and the object side of the sixth lens, CT5 is the thickness of the fifth lens on the optical axis, and CT6 is the thickness of the sixth lens on the optical axis.

[0037] When the optical system satisfies the above relationship, it can effectively balance the high-order aberrations generated by the optical system, and is also beneficial to the field curvature adjustment during the assembly of the optical system, thereby improving the imaging quality of the optical system.

[0038] As an optional implementation manner, the optical system satisfies the following relationship: 4.5 < TD / ATP1L2 < 4.8, and / or, 8 < TD / ATL6P2 < 12;

[0039] Where TD is the distance on the optical axis from the object side of the second lens to the image side of the sixth lens, ATP1L2 is the distance on the optical axis from the first exit surface of the first prism to the object side of the second lens, and ATL6P2 is the distance on the optical axis from the image side of the sixth lens to the second entrance surface of the second prism.

[0040] When the optical system satisfies the above relationship, it can effectively balance the high-order aberrations generated by the optical system, and is also beneficial to the field curvature adjustment during the assembly of the optical system, thereby improving the imaging quality of the optical system.

[0041] In a second aspect, the present application also discloses an imaging module, which includes an image sensor and the optical system as described in the first aspect above, and the image sensor is disposed on the image side of the optical system.

[0042] Thirdly, this application also discloses a terminal device, including a housing and a camera module as described in the second aspect above, the camera module being disposed in the housing.

[0043] Compared with the prior art, the beneficial effects of this application are:

[0044] In the optical system, camera module, and terminal device provided in this application, to meet the requirements of high pixel count and miniaturization, the first lens is configured to have positive refractive power, and its object-side surface is convex near the optical axis, which helps to effectively increase the field of view and couple more light into the optical system. Simultaneously, a first prism is placed between the first and second lenses. This first prism allows light rays exiting the first lens to enter the first prism from the first incident surface, be reflected by the first reflecting surface, and exit from the first exit surface, thus reducing the incident light direction of the optical system. The thickness of the second lens is as follows: The second lens is designed with negative refractive power, and its object-side and image-side surfaces are convex and concave near the optical axis, respectively, which helps correct aberrations and improve the imaging quality of the optical system. The third lens is designed with positive refractive power, and its object-side surface is convex near the optical axis, which helps delay the light rays entering the optical system, correcting spherical aberration, coma, and distortion generated by the front lens group. It also helps reduce the incident angle of the incident light after passing through the aperture stop, allowing more light to couple into the optical system and improving the relative illumination of the optical system. The fourth lens is designed with negative refractive power... The first lens, with its concave and convex surfaces near the optical axis on its object and image sides respectively, further couples the light passing through it into the optical system. The fifth lens, with its positive refractive power and concave and convex surfaces near the optical axis on its object and image sides respectively, helps to concentrate light rays and reduce the overall length of the optical system. The sixth lens, with its negative refractive power and concave surfaces near the optical axis on both its object and image sides, combined with the positive refractive power of the fifth lens, helps to eliminate chromatic aberration, correct astigmatism, improve resolution, and reduce the angle of light deflection, thus lowering optical distortion. The system's sensitivity is enhanced by placing a second prism between the sixth lens and the imaging surface of the optical system. Light rays emitted from the sixth lens enter the second prism from the second incident surface, are reflected by the second reflecting surface to the third reflecting surface, are reflected by the third reflecting surface to the second reflecting surface, and are transmitted through the second reflecting surface to the imaging surface of the optical system. In other words, the second prism enables the folding of light rays, thereby achieving multiple reflections of the light path within a limited thickness range. This not only achieves high-quality optical imaging but also helps to further reduce the thickness of the optical system along the incident direction of the light rays, enabling the miniaturization of the optical system.

[0045] The optical system satisfies the relationship 27.6deg≤FOV≤29deg. By reasonably setting the maximum field of view of the optical system, a sufficient field of view can be provided to meet the large field of view requirements of the optical system.

[0046] The optical system satisfies the relation 1.9≤FNO≤2.7. By constraining the aperture number of the optical system, the light transmission capability of the optical system can be improved, resulting in higher relative illumination. This allows the optical system to have good imaging quality even in dark environments such as at night or on rainy days, meeting the requirements of large aperture and high resolution. Attached Figure Description

[0047] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0048] Figure 1 This is a schematic diagram of the optical system disclosed in Embodiment 1 of this application;

[0049] Figure 2 These are the spherical aberration diagram (mm), astigmatism diagram (mm), and distortion diagram (%) of the optical system disclosed in Embodiment 1 of this application;

[0050] Figure 3 This is a schematic diagram of the optical system disclosed in Embodiment 2 of this application;

[0051] Figure 4 These are the spherical aberration diagram (mm), astigmatism diagram (mm), and distortion diagram (%) of the optical system disclosed in Embodiment 2 of this application;

[0052] Figure 5 This is a schematic diagram of the optical system disclosed in Embodiment 3 of this application;

[0053] Figure 6 These are the spherical aberration diagram (mm), astigmatism diagram (mm), and distortion diagram (%) of the optical system disclosed in Embodiment 3 of this application;

[0054] Figure 7 This is a schematic diagram of the optical system disclosed in Embodiment 4 of this application;

[0055] Figure 8 These are the spherical aberration diagram (mm), astigmatism diagram (mm), and distortion diagram (%) of the optical system disclosed in Embodiment 4 of this application;

[0056] Figure 9 This is a schematic diagram of the camera module disclosed in this application;

[0057] Figure 10 This is a structural diagram of the terminal device disclosed in this application when it is a car. Detailed Implementation

[0058] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0059] In this application, the terms "upper," "front," "rear," "top," "inner," "outer," and "middle," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0060] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.

[0061] Furthermore, the term "setup" should be interpreted broadly. For example, it can refer to a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection via an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0062] Furthermore, the terms "first," "second," etc., are primarily used to distinguish different devices, elements, or components (which may be the same or different in specific type and construction), and are not intended to indicate or imply the relative importance or quantity of the indicated devices, elements, or components. Unless otherwise stated, "a plurality of" means two or more.

[0063] The technical solution of this application will be further described below with reference to the embodiments and accompanying drawings.

[0064] Please see Figure 1This application discloses an optical system 100, which includes a first lens L1, a first prism P1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a second prism P2 arranged sequentially along the optical axis from the object side to the image side. During imaging, light rays enter the first lens L1, the first prism P1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the second prism P2 sequentially from the object side of the first lens L1, and finally form an image on the imaging plane 101 of the optical system 100.

[0065] In some embodiments, the first lens L1 has positive refractive power, the second lens L2 has negative refractive power, the third lens L3 has positive refractive power, the fourth lens L4 has negative refractive power, the fifth lens L5 has positive refractive power, and the sixth lens L6 has negative refractive power.

[0066] In some embodiments, the object-side surface S1 of the first lens L1 is convex near the optical axis; the object-side surface S6 of the second lens L2 is convex near the optical axis, and the image-side surface S7 of the second lens L2 is concave near the optical axis; the object-side surface S8 of the third lens L3 is convex near the optical axis; the object-side surface S10 of the fourth lens L4 is concave near the optical axis, and the image-side surface S11 of the fourth lens L4 is convex near the optical axis; the object-side surface S12 of the fifth lens L5 is convex near the optical axis, and the image-side surface S13 of the fifth lens L5 is concave near the optical axis; the object-side surface S14 of the sixth lens L6 is concave near the optical axis, and the image-side surface S15 of the sixth lens L6 is concave near the optical axis.

[0067] Optionally, all lenses in the optical system 100 may be made of glass, or all may be made of plastic, or some lenses may be made of glass and some of them may be made of plastic. Preferably, all lenses in the optical system 100 are made of plastic, as plastic lenses can reduce the weight and cost of the optical system 100. Of course, in other embodiments, all lenses in the optical system 100 are made of glass, as glass lenses can suppress the shift of the back focus of the optical system 100 due to temperature changes, which is beneficial to improving the stability of the optical system 100.

[0068] In some embodiments, the optical system further includes an aperture stop 102, which can be an aperture stop and / or a field stop, and can be disposed between the image-side surface S7 of the second lens L2 and the object-side surface S8 of the third lens L3 in the optical system 100. It is understood that in other embodiments, the aperture stop 102 can also be disposed between other lenses, and the setting can be adjusted according to the actual situation. This embodiment does not make specific limitations.

[0069] In some embodiments, the optical system 100 further includes a filter 110, which can be disposed between the image-side surface S15 of the sixth lens L6 and the imaging surface 101 of the optical system 100. Of course, in other embodiments, the filter 110 can also be disposed between other lenses, and the arrangement can be adjusted according to actual conditions; this embodiment does not impose specific limitations. In this embodiment, the filter 110 can be an infrared cut-off filter, thereby filtering out light of other wavelengths such as infrared light, allowing only visible light to pass through, making the image more consistent with the visual experience of the human eye. Of course, the filter 110 can also be an infrared bandpass filter, thereby filtering out light of other wavelengths such as visible light, allowing only infrared light to pass through. By filtering out light of other wavelengths such as visible light, the image quality is improved; and the optical system 100 can be used as an infrared optical system 100, that is, the optical system 100 can also image and obtain better image effects in dim environments and other special application scenarios. Preferably, the filter 110 can be made of glass. Of course, in other embodiments, the filter 110 can also be made of optical glass with a coating, or a filter 110 of other materials. The choice can be made according to actual needs, and no specific limitation is made in this embodiment.

[0070] In some embodiments, the optical system 100 may also include a protective glass (not shown) disposed between the filter 110 and the imaging surface 101, so that it can be close to the image sensor 201 during subsequent assembly, thereby providing protection.

[0071] In some embodiments, the first prism P1 is located between the first lens L1 and the second lens L2. The first prism P1 includes a first incident surface S3, a first reflecting surface S4 and a first exiting surface S5 along the optical path. The light rays emitted from the first lens L1 enter the first prism P1 through the first incident surface S3, are reflected by the first reflecting surface S4, and are emitted through the first exiting surface S5.

[0072] Optionally, the first prism P1 is located between the first lens L1 and the second lens L2, enabling the optical system to achieve telephoto capabilities. The first incident surface S3 can be planar or convex, and its configuration can be adjusted according to actual conditions; this embodiment does not impose a specific limitation. For example, the first incident surface S3 can be planar, and the image-side surface S2 of the first lens L1 can also be planar. In this case, the first incident surface S3 is fitted to the image-side surface of the first lens L1.

[0073] Optionally, the first prism P1 can be a right-angle prism, wherein the angle between the first incident surface S3 and the first reflecting surface S4 is 45°, and the angle between the first reflecting surface S4 and the first exiting surface S5 is 45°.

[0074] In some embodiments, the second prism P2 includes a second incident surface S16, a second reflecting surface S17, and a third reflecting surface S18 in sequence along the optical path. The light emitted from the sixth lens L6 is transmitted from the second incident surface S16 into the second prism P2, reflected by the second reflecting surface S17 to the third reflecting surface S18, reflected by the third reflecting surface S18 back to the second reflecting surface S17, and transmitted through the second reflecting surface S17 to the imaging surface 101 of the optical system.

[0075] Optionally, the second prism P2 is located between the sixth lens L6 and the filter 110, enabling the imaging surface 101 to be tilted to reduce the overall thickness of the optical system 100. Further, the angle between the second incident surface S16 and the second reflecting surface S17 is 50°–60°, and the angle between the second reflecting surface S17 and the third reflecting surface S18 is 25°–29°. For example, the angle between the second incident surface S16 and the second reflecting surface S17 can be 50°, 60°, 55°, 58°, etc., and the angle between the second reflecting surface S17 and the third reflecting surface S18 can be 25°, 30°, 27°, 29°, etc.

[0076] For example, the second incident surface S16 and the second reflecting surface S17, the second reflecting surface S17 and the third reflecting surface S18, and the second incident surface S16 and the third reflecting surface S18 can all be directly connected or all be indirectly connected. Alternatively, the second incident surface S16 and the second reflecting surface S17, the second reflecting surface S17 and the third reflecting surface S18, and the second incident surface S16 and the third reflecting surface S18 can be partially directly connected or partially indirectly connected. This application embodiment does not limit this.

[0077] For example, such as Figure 1 As shown, the second prism P2 can be roughly a triangular prism, wherein the second incident surface S16, the second reflecting surface S17 and the third reflecting surface S18 are connected to form a triangular prism.

[0078] In some embodiments, the second incident surface S16 is connected between the second reflecting surface S17 and the third reflecting surface S18. The second reflecting surface S17 is positioned close to and parallel to the imaging surface of the optical system. The angle α between the imaging surface 101 and the optical axis of the first lens L1 satisfies: 48° < α < 60°. By setting the imaging surface 101 at an angle to the optical axis of the first lens L1, when the optical system 100 is applied to the camera module 200, the image sensor 201 of the camera module 200 can be tilted relative to the optical axis of the first lens L1, thereby reducing the thickness of the camera module 200 along the optical axis of the first lens L1, which is beneficial for achieving miniaturization of the terminal device 300.

[0079] In some embodiments, the optical system 100 satisfies the relation 27.6deg < FOV < 29deg, where FOV is the maximum field of view angle of the optical system 100. By constraining the range of the maximum field of view angle of the optical system 100, the optical system 100 has a relatively small field of view angle, enabling the optical system 100 to have the functions of a small field of view and ultra-telephoto, thus meeting the shooting requirements for long distances.

[0080] In some embodiments, the optical system 100 satisfies the relation 1.9 < FNO < 2.7, where FNO is the f-number of the optical system 100. By constraining the f-number of the optical system 100, the light passing ability of the optical system 100 can be improved, making the relative illuminance of the optical system 100 higher, so that it also has good imaging quality in relatively dark environments such as at night or on rainy and cloudy days, meeting the requirements of a large aperture and high resolution.

[0081] In some embodiments, the optical system 100 satisfies the relation 7 < TTL / ImgH < 7.8, where TTL is the distance from the object side surface of the first lens to the imaging surface on the near optical axis, and ImgH is half of the image height corresponding to the maximum field of view angle of the optical system 100. By controlling the ratio of the total length of the optical system 100 to the half image height of the optical system 100, it is beneficial to control the overall thickness and overall height of the optical system 100, and thus beneficial to achieving the miniaturized design of the optical system 100.

[0082] In some embodiments, the optical system 100 satisfies the relation 0.85 < SD10 / SD1 < 1.05, where SD10 is half of the maximum effective aperture of the image side surface of the fifth lens, and SD1 is half of the maximum effective aperture of the object side surface S1 of the first lens L1. [[ID=##]]

[0083] By controlling the effective half-apertures of the first lens L1 and the fifth lens L5, it is beneficial to avoid a large step structure between the first lens L1 and the fifth lens L5, which is conducive to constraining the light path of the optical system 100 and also conducive to providing the assembly stability of the optical system 100.

[0084] In some embodiments, the optical system 100 satisfies the relation 2.4 < f1 / f < 2.8, where f is the focal length of the optical system 100, and f1 is the focal length of the first lens L1.

[0085] In some embodiments, the optical system 100 satisfies the relation -1 < f2 / f < -0.8, where f2 is the focal length of the second lens L2.

[0086] In some embodiments, the optical system 100 satisfies the relation 0.4 < f3 / f < 0.5, where f3 is the focal length of the third lens L3.

[0087] In some embodiments, the optical system 100 satisfies the relation -2.9 < f4 / f < -2.4, where f4 is the focal length of the fourth lens L4.

[0088] In some embodiments, the optical system 100 satisfies the relation 2.2 < f5 / f < 2.8, where f5 is the focal length of the fifth lens L5.

[0089] In some embodiments, the optical system 100 satisfies the relation -11 < f6 / f < -4, where f6 is the focal length of the sixth lens L6.

[0090] By reasonably controlling the ratio of each lens to the focal length of the optical system 100, the refractive power distribution of each lens in the optical system 100 is made appropriate, which is beneficial to slowing down the generation of aberrations and avoiding problems in image correction of the optical system 100 caused by excessive change in the refractive power of a certain lens.

[0091] In some embodiments, the optical system 100 satisfies the relation 2 < R1 / f < 2.3, where R1 is the curvature radius of the object side surface S1 of the first lens L1 on the optical axis.

[0092] In some embodiments, the optical system 100 satisfies the relation 20 < R2 / f, where R2 is the curvature radius of the image side surface S2 of the first lens L1 on the optical axis.

[0093] In some embodiments, the optical system 100 satisfies the relation 3.33 < f / R3 < 3.7, where R3 is the curvature radius of the object side surface S6 of the second lens L2 on the optical axis.

[0094] In some embodiments, the optical system 100 satisfies the relation 5.56 < f / R4 < 6.67, where R4 is the curvature radius of the image side surface S7 of the second lens L2 on the optical axis.

[0095] In some embodiments, the optical system 100 satisfies the relation 0.2 < R5 / f < 0.3, where R5 is the curvature radius of the object side surface S8 of the third lens L3 on the optical axis.

[0096] In some embodiments, the optical system 100 satisfies the relation 10 < |R6| / f, where R6 is the curvature radius of the image side surface S9 of the third lens L3 on the optical axis.

[0097] In some embodiments, the optical system 100 satisfies the relation -0.4 < R7 / f < -0.3, where R7 is the curvature radius of the object side surface S10 of the fourth lens L4 on the optical axis.

[0098] In some embodiments, the optical system 100 satisfies the relation -0.5 < R8 / f < -0.4, where R8 is the radius of curvature of the image side surface S11 of the fourth lens L4 at the optical axis.

[0099] In some embodiments, the optical system 100 satisfies the relation 0.25 < R9 / f < 0.28, where R9 is the radius of curvature of the object side surface S12 of the fifth lens L5 at the optical axis.

[0100] In some embodiments, the optical system 100 satisfies the relation 0.28 < R10 / f < 0.32, where R10 is the radius of curvature of the image side surface S13 of the fifth lens L5 at the optical axis.

[0101] In some embodiments, the optical system 100 satisfies the relation -7 < R11 / f < -2, where R11 is the radius of curvature of the object side surface S14 of the sixth lens L6 at the optical axis.

[0102] In some embodiments, the optical system 100 satisfies the relation 30 < R12 / f, where R12 is the radius of curvature of the image side surface S15 of the sixth lens L6 at the optical axis.

[0103] By reasonably configuring the ratio of the radius of curvature of each lens to the focal length of the optical system 100, the refractive power distribution of each lens can be made uniform and reasonable, the aberration of the optical system 100 is easy to correct, and the image quality is good.

[0104] In some embodiments, the optical system 100 satisfies the relation 0.4 < CT1 / CT2 < 0.53. Here, CT1 is the thickness of the first lens L1 on the optical axis; CT2 is the thickness of the second lens L2 on the optical axis.

[0105] In some embodiments, the optical system 100 satisfies the relation 1.4 < CT2 / CT3 < 1.7, where CT3 is the thickness of the third lens L3 on the optical axis.

[0106] In some embodiments, the optical system 100 satisfies the relation 0.7 < CT3 / CT4 < 0.8, where CT4 is the thickness of the fourth lens L4 on the optical axis.

[0107] In some embodiments, the optical system 100 satisfies the relation 1.4 < CT4 / CT5 < 1.6, where CT5 is the thickness of the fifth lens L5 on the optical axis.

[0108] In some embodiments, the optical system 100 satisfies the relation 1.6 < CT5 / CT6 < 1.8, where CT6 is the thickness of the sixth lens L6 on the optical axis.

[0109] By reasonably controlling the central thickness of each lens, it is convenient to control the optical power of each lens, so that the aberrations of each lens can compensate each other, reduce the aberration of the optical system 100, and is beneficial to improving the imaging quality of the optical system 100.

[0110] In some embodiments, the optical system 100 satisfies the relation 3.5 < AT23 / AT34 < 4.7, where AT23 is the distance on the optical axis from the image side surface S7 of the second lens L2 to the object side surface S8 of the third lens L3, and AT34 is the distance on the optical axis from the image side surface S9 of the third lens L3 to the object side surface S10 of the fourth lens L4. By reasonably controlling the ratio of the distance between the second lens L2 and the third lens L3 and the distance between the third lens L3 and the fourth lens L4, the high-order aberrations generated by the optical system 100 can be effectively balanced, and it is also beneficial to the field curvature adjustment during the assembly of the optical system 100, thereby improving the imaging quality of the optical system 100.

[0111] In some embodiments, the optical system 100 satisfies the relation 0.7 < AT56 / (CT5 + CT6) < 1.1, where AT56 is the distance on the optical axis from the image side surface S13 of the fifth lens L5 to the object side surface S14 of the sixth lens L6, CT5 is the thickness of the fifth lens L5 on the optical axis, and CT6 is the thickness of the sixth lens L6 on the optical axis. By reasonably controlling the ratio of the distance between the fifth lens L5 and the sixth lens L6 and the thicknesses of the fifth lens L5 and the sixth lens L6, the high-order aberrations generated by the optical system 100 can be effectively balanced, and it is also beneficial to the field curvature adjustment during the assembly of the optical system 100, thereby improving the imaging quality of the optical system 100.

[0112] In some embodiments, the optical system 100 satisfies the relation 4.5 < TD / ATP1L2 < 4.8, where TD is the distance on the optical axis from the object side surface S6 of the second lens L2 to the image side surface S15 of the sixth lens L6, and ATP1L2 is the distance on the optical axis from the first exit surface S3 of the first prism P1 to the object side surface S6 of the second lens L2. By reasonably controlling the distances between the first prism P1, the second lens L2 and the sixth lens L6, the high-order aberrations generated by the optical system 100 can be effectively balanced, and it is also beneficial to the field curvature adjustment during the assembly of the optical system 100, thereby improving the imaging quality of the optical system 100.

[0113] In some embodiments, the optical system 100 satisfies the relation 8 < TD / ATL6P2 < 12, where ATL6P2 is the distance on the optical axis from the image side surface S15 of the sixth lens L6 to the second incident surface S16 of the second prism P2. By reasonably controlling the distances between the second prism P2, the second lens L2, and the sixth lens L6, the high-order aberrations generated by the optical system 100 can be effectively balanced, and it is also beneficial to the field curvature adjustment during the assembly of the optical system 100, thereby improving the imaging quality of the optical system 100.

[0114] Embodiment 1

[0115] Figure 1 FIG. 7 is a schematic structural diagram of the optical system 100 disclosed in Embodiment 1 of the present application. The optical system 100 includes a first lens L1, a first prism P1, a second lens L2, a third lens L3, an aperture 102, a fourth lens L4, a fifth lens L5, a sixth lens L6, a second prism P2, and a filter 110, which are sequentially arranged along the optical axis from the object side to the image side. Among them, the object side surface S1 of the first lens L1 is convex near the optical axis, and the image side surface S2 of the first lens L1 is flat near the optical axis; the object side surface S6 of the second lens L2 is convex near the optical axis, and the image side surface S7 of the second lens L2 is concave near the optical axis; the object side surface S8 of the third lens L3 is convex near the optical axis, and the image side surface S9 of the third lens L3 is concave near the optical axis; the object side surface S10 of the fourth lens L4 is concave near the optical axis, and the image side surface S11 of the fourth lens L4 is convex near the optical axis; the object side surface S12 of the fifth lens L5 is convex near the optical axis, and the image side surface S13 of the fifth lens L5 is concave near the optical axis; the object side surface S14 of the sixth lens L6 is concave near the optical axis, and the image side surface S15 of the sixth lens L6 is concave near the optical axis.

[0116] Specifically, the first prism P1 can be a right-angle prism. Among them, the included angle between the first incident surface S3 and the first reflection surface S4 is 45°, and the included angle between the first reflection surface S4 and the first exit surface S5 is 45°. The included angle between the second incident surface S16 and the second reflection surface S17 is 50°, and the included angle between the second reflection surface S17 and the third reflection surface S18 is 25°.

[0117] Specifically, taking the effective focal length parameter f = 22.11 mm, the aperture number FNO = 2.13, the maximum field of view FOV = 26.68 degrees, and the total optical length TTL = 42.01 mm of the optical system 100 as examples, other parameters of the optical system 100 are given in Table 1 below. The elements along the optical axis of the optical system 100 from the object side to the image side are arranged sequentially according to the order of the elements in Table 1 from top to bottom. In the same lens, the surface with the smaller surface number is the object side of the lens, and the surface with the larger surface number is the image side of the lens. For example, surface numbers 1 and 2 correspond to the object side S1 and image side S2 of the first lens L1, respectively. The Y-radius in Table 1 is the radius of curvature of the corresponding object side or image side at the optical axis. The first value in the "thickness" parameter column of the lens is the thickness of the lens on the optical axis, and the second value is the distance from the image side of the lens to the next surface on the optical axis. The value of the aperture 102 in the "Thickness" parameter column represents the distance on the optical axis from the aperture 102 to the vertex of the next surface (the vertex refers to the intersection of the surface and the optical axis). By default, the direction from the object side S1 of the first lens L1 to the image side of the last lens is the positive direction of the optical axis. When this value is negative, it indicates that the aperture 102 is set on the image side of the vertex of the next surface. If the thickness of the aperture 102 is positive, the aperture 102 is on the object side of the vertex of the next surface. It can be understood that the units of Y radius, thickness, and focal length in Table 1 are all mm. Moreover, the refractive index, Abbe number, etc. in Table 1 are all obtained at a reference wavelength of 587.6 nm, and the focal length is obtained at a reference wavelength of 555 nm.

[0118] Table 1

[0119]

[0120]

[0121] In Example 1, the object-side surface S1 and image-side surface S2 of the first lens L1, the object-side surface S6 and image-side surface S7 of the second lens L2, the object-side surface S8 and image-side surface S9 of the third lens L3, the object-side surface S10 and image-side surface S11 of the fourth lens L4, the object-side surface S12 and image-side surface S13 of the fifth lens L5, and the object-side surface S14 and image-side surface S15 of the sixth lens L6 are all aspherical. Therefore, the surface shape x of each aspherical lens can be defined using, but is not limited to, the following aspherical formula:

[0122]

[0123] Where x is the distance vector from the vertex of the aspherical surface at a height h along the optical axis; c is the curvature of the aspherical surface at the optical axis, c = 1 / Y (i.e., the paraxial curvature c is the reciprocal of the radius of curvature Y in Table 1 above); K is the conic coefficient; Ai is the i-th order correction coefficient of the aspherical surface. Table 2 below gives the higher-order coefficients A4, A6, A8, A10, A12, and A14 of each aspherical mirror surface of the first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, and sixth lens L6.

[0124] Table 2

[0125]

[0126]

[0127] Figure 2 These are the spherical aberration diagram (mm), astigmatism diagram (mm), and distortion diagram (%) of the optical system disclosed in Embodiment 1 of this application. Figure 2 Figure (A) shows the spherical aberration diagrams of optical system 100 at wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, and 470 nm. The horizontal axis along the X-axis represents the focal shift in mm, and the vertical axis along the Y-axis represents the normalized field of view. Figure 2 As can be seen from (A) in Example 1, the spherical aberration value of the optical system 100 in Example 1 is better, indicating that the imaging quality of the optical system 100 in this example is better.

[0128] Figure 2 (B) in the figure shows the light astigmatism of the optical system 100 in Example 1 at a wavelength of 555 nm. The horizontal axis along the X-axis represents the focal shift in mm, and the vertical axis along the Y-axis represents the image height in mm. In the astigmatism diagram, T represents the curvature of the imaging surface 101 in the meridional direction, and S represents the curvature of the imaging surface 101 in the sagittal direction. Figure 2 As can be seen from (B) in the figure, at this wavelength, the field curvature of the optical system 100 is small, and the field curvature and astigmatism of each field of view are well corrected. The center and edge of the field of view have clear imaging, that is, the astigmatism of the optical system 100 is well compensated.

[0129] Figure 2 (C) in the figure represents the distortion diagram of the optical system 100 in Example 1 at a wavelength of 555 nm. The horizontal axis along the X-axis represents distortion, and the vertical axis along the Y-axis represents image height, in mm. Figure 2 As can be seen from (C), at this wavelength, the image distortion caused by the main beam is small, and the distortion of the optical system 100 is well corrected.

[0130] Example 2

[0131] Figure 3 This is a schematic diagram of the structure of the optical system disclosed in Embodiment 2 of this application. The optical system 100 includes a first lens L1, a first prism P1, a second lens L2, a third lens L3, an aperture 102, a fourth lens L4, a fifth lens L5, a sixth lens L6, a second prism P2, and a filter 110 arranged sequentially along the optical axis from the object side to the image side. Among them, the object-side surface S1 of the first lens L1 is convex near the optical axis, and the image-side surface S2 of the first lens L1 is flat near the optical axis; the object-side surface S6 of the second lens L2 is convex near the optical axis, and the image-side surface S7 of the second lens L2 is concave near the optical axis; the object-side surface S8 of the third lens L3 is convex near the optical axis, and the image-side surface S9 of the third lens L3 is concave near the optical axis; the object-side surface S10 of the fourth lens L4 is concave near the optical axis, and the image-side surface S11 of the fourth lens L4 is convex near the optical axis; the object-side surface S12 of the fifth lens L5 is convex near the optical axis, and the image-side surface S13 of the fifth lens L5 is concave near the optical axis; the object-side surface S14 of the sixth lens L6 is concave near the optical axis, and the image-side surface S15 of the sixth lens L6 is concave near the optical axis.

[0132] Specifically, the first prism P1 can be a right-angle prism, wherein the angle between the first incident surface S3 and the first reflecting surface S4 is 45°, and the angle between the first reflecting surface S4 and the first exiting surface S5 is 45°. The angle between the second incident surface S16 and the second reflecting surface S17 is 60°, and the angle between the second reflecting surface S17 and the third reflecting surface S18 is 30°.

[0133] Specifically, taking the effective focal length parameter f = 23.4 mm, the aperture number FNO = 2.42, the maximum field of view FOV = 27.6 degrees, and the total optical length TTL = 43.02 mm of the optical system 100 as examples, other parameters of the optical system 100 are given in Table 3 below. The definitions of each parameter can be derived from the description of the aforementioned embodiments and will not be repeated here. Furthermore, the refractive index, Abbe number, etc., in Table 3 are obtained at a reference wavelength of 587.6 nm, and the focal length is obtained at a reference wavelength of 555 nm.

[0134] Table 3

[0135]

[0136]

[0137] Table 4 provides the higher-order coefficients applicable to the aspherical mirrors of the first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, and sixth lens L6 in Example 2. The shape of each aspherical surface can be defined by the formula given in Example 1.

[0138] Table 4

[0139]

[0140]

[0141] Please see Figure 4 ,Depend on Figure 4 As can be seen from (A) the spherical aberration diagram, (B) the ray astigmatism diagram, and (C) the distortion diagram, the spherical aberration, astigmatism, and distortion of the optical system 100 are well controlled, thus the optical system 100 of this embodiment possesses good imaging quality. Furthermore, regarding... Figure 4 (A) Figure 4 (B) and Figure 4 The wavelengths corresponding to the curves in (C) can be found in Example 1. Figure 2 (A) Figure 2 (B) Figure 2 The content described in (C) will not be repeated here.

[0142] Example 3

[0143] Figure 5 This is a schematic diagram of the structure of the optical system disclosed in Embodiment 3 of this application. The optical system 100 includes a first lens L1, a first prism P1, a second lens L2, a third lens L3, an aperture 102, a fourth lens L4, a fifth lens L5, a sixth lens L6, a second prism P2, and a filter 110 arranged sequentially along the optical axis from the object side to the image side. Among them, the object-side surface S1 of the first lens L1 is convex near the optical axis, and the image-side surface S2 of the first lens L1 is concave near the optical axis; the object-side surface S6 of the second lens L2 is convex near the optical axis, and the image-side surface S7 of the second lens L2 is concave near the optical axis; the object-side surface S8 of the third lens L3 is convex near the optical axis, and the image-side surface S9 of the third lens L3 is concave near the optical axis; the object-side surface S10 of the fourth lens L4 is concave near the optical axis, and the image-side surface S11 of the fourth lens L4 is convex near the optical axis; the object-side surface S12 of the fifth lens L5 is convex near the optical axis, and the image-side surface S13 of the fifth lens L5 is concave near the optical axis; the object-side surface S14 of the sixth lens L6 is concave near the optical axis, and the image-side surface S15 of the sixth lens L6 is concave near the optical axis.

[0144] Specifically, the first prism P1 can be a right-angle prism, wherein the angle between the first incident surface S3 and the first reflecting surface S4 is 45°, and the angle between the first reflecting surface S4 and the first exiting surface S5 is 45°. The angle between the second incident surface S16 and the second reflecting surface S17 is 55°, and the angle between the second reflecting surface S17 and the third reflecting surface S18 is 27°.

[0145] Specifically, taking the effective focal length parameter f = 22.1 mm, the aperture number FNO = 2.07, the maximum field of view FOV = 28.8 degu, and the total optical length TTL = 42.45 mm of the optical system 100 as examples, other parameters of the optical system 100 are given in Table 5 below. The definitions of each parameter can be derived from the description of the aforementioned embodiments and will not be repeated here. Furthermore, the refractive index, Abbe number, etc., in Table 5 are obtained at a reference wavelength of 587.6 nm, and the focal length is obtained at a reference wavelength of 555 nm.

[0146] Table 5

[0147]

[0148]

[0149] Table 6 provides the higher-order coefficients applicable to the aspherical mirrors of the first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, and sixth lens L6 in Example 3. The shape of each aspherical surface can be defined by the formula given in Example 1.

[0150] Table 6

[0151]

[0152]

[0153] Please see Figure 6 ,Depend on Figure 6 As can be seen from (A) the spherical aberration diagram, (B) the ray astigmatism diagram, and (C) the distortion diagram, the spherical aberration, astigmatism, and distortion of the optical system 100 are well controlled, thus the optical system 100 of this embodiment possesses good imaging quality. Furthermore, regarding... Figure 6 (A) Figure 6 (B) and Figure 6 The wavelengths corresponding to the curves in (C) can be found in Example 1. Figure 2 (A) Figure 2 (B) Figure 2 The content described in (C) will not be repeated here.

[0154] Example 4

[0155] Figure 7 This is a schematic diagram of the structure of the optical system disclosed in Embodiment 4 of this application. The optical system 100 includes a first lens L1, a first prism P1, a second lens L2, a third lens L3, an aperture 102, a fourth lens L4, a fifth lens L5, a sixth lens L6, a second prism P2, and a filter 110 arranged sequentially along the optical axis from the object side to the image side. Among them, the object-side surface S1 of the first lens L1 is convex near the optical axis, and the image-side surface S2 of the first lens L1 is concave near the optical axis; the object-side surface S6 of the second lens L2 is convex near the optical axis, and the image-side surface S7 of the second lens L2 is concave near the optical axis; the object-side surface S8 of the third lens L3 is convex near the optical axis, and the image-side surface S9 of the third lens L3 is concave near the optical axis; the object-side surface S10 of the fourth lens L4 is concave near the optical axis, and the image-side surface S11 of the fourth lens L4 is convex near the optical axis; the object-side surface S12 of the fifth lens L5 is convex near the optical axis, and the image-side surface S13 of the fifth lens L5 is concave near the optical axis; the object-side surface S14 of the sixth lens L6 is concave near the optical axis, and the image-side surface S15 of the sixth lens L6 is concave near the optical axis.

[0156] Specifically, the first prism P1 can be a right-angle prism, wherein the angle between the first incident surface S3 and the first reflecting surface S4 is 45°, and the angle between the first reflecting surface S4 and the first exiting surface S5 is 45°. The angle between the second incident surface S16 and the second reflecting surface S17 is 58°, and the angle between the second reflecting surface S17 and the third reflecting surface S18 is 29°.

[0157] Specifically, taking the effective focal length parameter f = 22.1 mm, the aperture number FNO = 2.59, the maximum field of view FOV = 29 degrees, and the total optical length TTL = 42.47 mm of the optical system 100 as examples, other parameters of the optical system 100 are given in Table 7 below. The definitions of each parameter can be derived from the description of the aforementioned embodiments and will not be repeated here. Furthermore, the refractive index, Abbe number, etc., in Table 7 are obtained at a reference wavelength of 587.6 nm, and the focal length is obtained at a reference wavelength of 555 nm.

[0158] Table 7

[0159]

[0160]

[0161] Table 8 provides the higher-order coefficients applicable to the aspherical mirrors of the first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, and sixth lens L6 in Example 4. The shape of each aspherical surface can be defined by the formula given in Example 1.

[0162] Table 8

[0163]

[0164]

[0165] Please see Figure 8 ,Depend on Figure 8 As can be seen from (A) the spherical aberration diagram, (B) the ray astigmatism diagram, and (C) the distortion diagram, the spherical aberration, astigmatism, and distortion of the optical system 100 are well controlled, thus the optical system 100 of this embodiment possesses good imaging quality. Furthermore, regarding... Figure 8 (A) Figure 8 (B) and Figure 8 The wavelengths corresponding to the curves in (C) can be found in Example 1. Figure 2 (A) Figure 2 (B) Figure 2 The content described in (C) will not be repeated here.

[0166] Please refer to Table 9, which summarizes the ratios of the relationships in the first to fourth embodiments of this application.

[0167] Table 9

[0168]

[0169]

[0170] Please see Figure 9This application also discloses a camera module 200, which includes an image sensor 201 and an optical system 100 as described in any of the embodiments 1 to 4 above. The image sensor 201 is disposed on the image side of the optical system 100. Specifically, the photosensitive surface of the image sensor 201 is located on the imaging surface 101 of the optical system 100, and the light rays of an object incident on the photosensitive surface through the lens can be converted into an electrical signal of the image. The image sensor 201 can be a complementary metal-oxide-semiconductor (CMOS) or a charge-coupled device (CCD). The camera module 200 can be an imaging module integrated on the terminal device 300, or it can be a separate lens. It is understood that the camera module 200 with the above-described optical system 100 has all the technical effects of the above-described optical system 100, that is, the camera module 200 can meet the requirements of high-quality optical performance while taking into account miniaturization design. Since the above-described technical effects have been described in detail in the embodiments of the optical system 100, they will not be repeated here.

[0171] This application also discloses a terminal device 300, which includes a housing 301 and the aforementioned camera module 200, with the camera module 200 disposed within the housing 301. The terminal device 300 may include, but is not limited to, mobile phones, tablets, laptops, smartwatches, in-vehicle devices, drones, and surveillance cameras. Please refer to [link / reference]. Figure 10 Taking the terminal device 300 as a vehicle as an example, the housing 301 can be the vehicle body, and the camera module 200 can be installed on the vehicle body, for example, inside or outside the vehicle body.

[0172] It is understood that the terminal device 300 with the aforementioned camera module 200 also possesses all the technical effects of the aforementioned optical system 100. That is, the terminal device 300 can meet high-quality optical performance while also taking into account miniaturization. Since the aforementioned technical effects have been described in detail in the embodiments of the optical system 100, they will not be repeated here.

[0173] The optical system, camera module, and terminal device disclosed in the embodiments of this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the embodiments above are only for the purpose of helping to understand the optical system, camera module, and terminal device of this application and their core ideas. At the same time, for those skilled in the art, there will be changes in the specific implementation methods and application scope based on the ideas of this application. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. An optical system, characterized in that, There are a total of six lenses with refractive power. The optical system includes, in order from the object side to the image side along the optical path: A first lens, which has positive refractive power, and the object side surface of the first lens is convex near the optical axis. A first prism, which includes a first incident surface, a first reflection surface, and a first exit surface in sequence along the optical path. The light rays emitted from the first lens enter the first prism from the first incident surface, are reflected by the first reflection surface, and exit from the first exit surface. A second lens, which has negative refractive power, the object side surface of the second lens is convex near the optical axis, and the image side surface of the second lens is concave near the optical axis. A third lens, which has positive refractive power, and the object side surface of the third lens is convex near the optical axis. A fourth lens, which has negative refractive power, the object side surface of the fourth lens is concave near the optical axis, and the image side surface of the fourth lens is convex near the optical axis. A fifth lens, which has positive refractive power, the object side surface of the fifth lens is convex near the optical axis, and the image side surface of the fifth lens is concave near the optical axis. A sixth lens, which has negative refractive power, and both the object side surface and the image side surface of the sixth lens are concave near the optical axis. A second prism, which includes a second incident surface, a second reflection surface, and a third reflection surface in sequence along the optical path. The light rays emitted from the sixth lens are transmitted into the second prism from the second incident surface, are reflected by the second reflection surface to the third reflection surface, are reflected by the third reflection surface to the second reflection surface, and are transmitted through the second reflection surface to the imaging surface of the optical system. The optical system satisfies the following relationship: 27.6deg < FOV < 29deg and 1.9 < FNO < 2.7; where FOV is the maximum field angle of the optical system and FNO is the f-number of the optical system.

2. The optical system according to claim 1, characterized in that, The second incident surface is connected to the second reflection surface, the second reflection surface is connected to the third reflection surface, the second reflection surface is arranged close to and parallel to the imaging surface of the optical system, and the included angle α between the imaging surface and the optical axis of the first lens satisfies: 48° < α < 60°.

3. The optical system according to claim 1, characterized in that, The optical system satisfies the following relationship: 7 < TTL / ImgH < 7.8, and / or, 0.85 < SD10 / SD1 < 1.05; where TTL is the distance from the object side surface of the first lens to the imaging surface on the optical axis near the optical axis, ImgH is half of the image height corresponding to the maximum field angle of the optical system, SD10 is half of the maximum effective aperture of the image side surface of the fifth lens, and SD1 is half of the maximum effective aperture of the object side surface of the first lens.

4. The optical system according to claim 1, characterized in that, The optical system satisfies the following relationship: 2.4 < f1 / f < 2.8, and / or, -1 < f2 / f < -0.8, and / or, 0.4 < f3 / f < 0.5, and / or, -2.9 < f4 / f < -2.4, and / or, 2.2 < f5 / f < 2.8, and / or, -11 < f6 / f < -4; Where, f is the focal length of the optical system, f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens; f5 is the focal length of the fifth lens; f6 is the focal length of the sixth lens.

5. The optical system according to claim 1, characterized in that, The optical system satisfies the following relational expressions: 2 < R1 / f < 2.3, and / or, 20 < R2 / f, and / or, 3.33 < f / R3 < 3.7, and / or, 5.56 < f / R4 < 6.67, and / or, 0.2 < R5 / f < 0.3, and / or, 10 < |R6| / f, and / or, -0.4 < R7 / f < -0.3, and / or, -0.5 < R8 / f < -0.4, and / or, 0.25 < R9 / f < 0.28, and / or, 0.28 < R10 / f < 0.32, and / or, -7 < R11 / f < -2, and / or, 30 < R12 / f; Where, R1 is the curvature radius of the object side surface of the first lens at the optical axis, R2 is the curvature radius of the image side surface of the first lens at the optical axis, R3 is the curvature radius of the object side surface of the second lens at the optical axis, R4 is the curvature radius of the image side surface of the second lens at the optical axis, R5 is the curvature radius of the object side surface of the third lens at the optical axis, R6 is the curvature radius of the image side surface of the third lens at the optical axis, R7 is the curvature radius of the object side surface of the fourth lens at the optical axis, R8 is the curvature radius of the image side surface of the fourth lens at the optical axis, R9 is the curvature radius of the object side surface of the fifth lens at the optical axis, R10 is the curvature radius of the image side surface of the fifth lens at the optical axis, R11 is the curvature radius of the object side surface of the sixth lens at the optical axis, R12 is the curvature radius of the image side surface of the sixth lens at the optical axis.

6. The optical system according to claim 1, characterized in that, The optical system satisfies the following relational expressions: 0.4 < CT1 / CT2 < 0.53, and / or, 1.4 < CT2 / CT3 < 1.7, and / or, 0.7 < CT3 / CT4 < 0.8, and / or, 1.4 < CT4 / CT5 < 1.6, and / or, 1.6 < CT5 / CT6 < 1.8; Where, CT1 is the thickness of the first lens on the optical axis; CT2 is the thickness of the second lens on the optical axis; CT3 is the thickness of the third lens on the optical axis; CT4 is the thickness of the fourth lens on the optical axis; CT5 is the thickness of the fifth lens on the optical axis; CT6 is the thickness of the sixth lens on the optical axis.

7. The optical system according to claim 1, characterized in that, The optical system satisfies the following relational expressions: 3.5 < AT23 / AT34 < 4.7, and / or, 0.7 < AT56 / (CT5 + CT6) < 1.1; Where, AT23 is the distance on the optical axis from the image side of the second lens to the object side of the third lens, AT34 is the distance on the optical axis from the image side of the third lens to the object side of the fourth lens, AT56 is the spacing on the optical axis from the image side of the fifth lens to the object side of the sixth lens, CT5 is the thickness of the fifth lens on the optical axis, and CT6 is the thickness of the sixth lens on the optical axis.

8. The optical system according to claim 1, characterized in that, The optical system satisfies the following relational expressions: 4.5 < TD / ATP1L2 < 4.8, and / or, 8 < TD / ATL6P2 < 12; Where, TD is the distance on the optical axis from the object side of the second lens to the image side of the sixth lens, ATP1L2 is the distance on the optical axis from the first exit surface of the first prism to the object side of the second lens, and ATL6P2 is the distance on the optical axis from the image side of the sixth lens to the second entrance surface of the second prism.

9. A camera module, characterized in that, The imaging module includes an image sensor and the optical system according to any one of claims 1-8, and the image sensor is disposed on the image side of the optical system.

10. A terminal device, characterized in that, Including the imaging module according to claim 9.

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