Optical system, camera module and terminal device

Abstract

The application discloses an optical system, a camera module and a terminal device. The optical system comprises a first lens with negative refractive power, a second lens with refractive power, a third lens with refractive power, a fourth lens with positive refractive power, a fifth lens with refractive power, a sixth lens with negative refractive power, a seventh lens with positive refractive power and an eighth lens with negative refractive power. The object side of the first lens is concave, and the image side is concave. The object side of the second lens is convex, and the image side is concave. The object side of the fourth lens is convex, and the image side is convex. The object side of the sixth lens is convex, and the image side is concave. The object side of the eighth lens is concave, and the image side is concave. The optical system satisfies the relationship: -11 < (R11+R21) / f1 < 0. The optical system according to the application can meet the miniaturization design of the optical system, ensure good forming yield and assembly yield, and has a large amount of light.

Description

Technical Field

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

[0002] With the emergence of the metaverse concept, VR experiences have enriched our lives, allowing people to experience virtual fairy tale worlds, vast cosmic spaces, and dynamic game environments, providing an unprecedented visual feast. To make these visual experiences more vivid, the imaging lens has become a core component. Designing lenses with high clarity and excellent visual quality is a key technology that needs to be mastered. Summary of the Invention

[0003] This invention aims to at least solve one of the technical problems existing in the prior art. To this end, the first aspect of this application proposes an optical system with ultra-wide-angle characteristics, which can ensure good molding and assembly yield while meeting the requirements of miniaturization design of optical systems. Compared with other miniature camera lenses, it has a larger light intake and can meet the needs of high-definition image shooting.

[0004] A second aspect of the present invention also proposes a camera module.

[0005] A third aspect of the present invention also proposes a terminal device.

[0006] According to the embodiment of the first aspect of this application, the optical system comprises eight lenses with refractive power, which are sequentially arranged along the optical axis from the object side to the image side: a first lens with negative refractive power, the object side of which is concave and the image side of which is concave; a second lens with refractive power, the object side of which is convex and the image side of which is concave; a third lens with refractive power; a fourth lens with positive refractive power, the object side of which is convex and the image side of which is convex; a fifth lens with refractive power, the object side of which is concave and the image side of which is convex; a sixth lens with negative refractive power, the object side of which is convex and the image side of which is concave; a seventh lens with positive refractive power, the object side of which is convex and the image side of which is convex; and an eighth lens with negative refractive power, the object side of which is concave and the image side of which is concave.

[0007] In the optical system, the first lens has negative refractive power. Its concave object-side and image-side surfaces near the optical axis enhance the negative refractive power of the first lens, facilitating the convergence of light rays incident at large angles and thus shortening the overall system length. The second lens, also possessing refractive power, expands the field of view, resulting in a wider field of view and correcting spherical aberration caused by the first lens. Furthermore, the second lens's convex object-side and concave image-side surface design allows for a smaller front aperture, further improving light convergence and enhancing the optical performance. The third lens, with its refractive power, smoothly transitions the light rays refracted by the first and second lenses to the fourth lens, reducing the aberration correction burden on the rear lens group (fourth to eighth lenses) and improving system resolution, thereby achieving high pixel count. Combined with the positive refractive power of the third lens… The four lenses, with the fourth lens having a convex surface design on both the object-side and image-side near the optical axis, are beneficial for correcting astigmatism produced by the object-side lenses (i.e., the first to third lenses) of the optical system. Combined with the fifth lens, which has refractive power and a concave surface design on the object-side near the optical axis and a convex surface design on the image-side, it is beneficial for correcting coma of the optical system. The sixth lens with negative refractive power and the seventh lens with positive refractive power are beneficial for further correcting coma of the optical system and reducing the correction pressure of the image-side eighth lens. In addition, the convex object-side and concave image-side of the sixth lens and the convex object-side and image-side of the seventh lens are beneficial for correcting spherical aberration, astigmatism, field curvature and distortion of the optical system. At the same time, the eighth lens with negative refractive power, combined with a concave surface design on both the object-side and image-side, can balance the difficult-to-correct aberrations caused by the first to seventh lenses when converging incident light, reduce the generation of chromatic aberration, and improve the imaging quality of the optical system.

[0008] In one embodiment, the optical system satisfies the relationship: -11 < (R11 + R21) / f1 < 0; R11 is the radius of curvature of the object-side surface of the first lens at the optical axis, R21 is the radius of curvature of the image-side surface of the first lens at the optical axis, and f1 is the effective focal length of the first lens. Satisfying this relationship indicates that the radius of curvature of the object-side and image-side surfaces of the first lens is well-matched with the focal length, providing a large field of view for the optical system. If (R11 + R21) / f1 > 17, the field of view will be too large, increasing the difficulty of manufacturing; if (R11 + R21) / f1 < -50, the focal length and the radius of curvature of the lens surface will not be well-matched, resulting in a decrease in the imaging performance of the optical system and an increase in astigmatism.

[0009] In one embodiment, the optical system satisfies the relationship: -0.1 < (|R51| - |R52|) / (|R51| + |R52|) < 0.8; R51 is the radius of curvature of the object-side surface of the fifth lens at the optical axis, and R52 is the radius of curvature of the image-side surface of the fifth lens at the optical axis. Satisfying this relationship indicates that the radii of curvature of the object-side and image-side surfaces of the fifth lens are appropriate, which can reasonably correct the spherical aberration of the optical system, balance the optical path difference, correct field curvature, and simultaneously reduce the sensitivity of the optical system and improve assembly stability. If (|R51| - |R52|) / (|R51| + |R52|) > 0.8, it can easily lead to excessive field curvature of the optical system; if (|R51| - |R52|) / (|R51| + |R52|) < -0.1, it can easily lead to increased sensitivity of the optical system and reduced production yield.

[0010] In one embodiment, the optical system satisfies the relationship: 1 < ∑ET / ∑CT < 1.2; ∑ET is the sum of the edge thicknesses at the maximum effective aperture of the first to eighth lenses, and ∑CT is the sum of the thicknesses of the first to eighth lenses along the optical axis. Satisfying the above relationship can reasonably balance the optical path difference between the central and peripheral fields of view, effectively improve field curvature, and reduce distortion. If ∑ET / ∑CT > 1.2, the optical path of the peripheral field of view is easily greater than that of the central ray, resulting in excessive field curvature and causing blurring of the outer field of view image. If ∑ET / ∑CT < 1, the optical path of the peripheral field of view is easily less than that of the central ray, also resulting in excessive field curvature and blurring of the outer field of view image.

[0011] In one embodiment, the optical system satisfies the relationship: 1.0 < (SD71 + SD81) / Imgh < 1.2; SD71 is the maximum effective half-aperture of the object side of the seventh lens, SD81 is the maximum effective half-aperture of the object side of the eighth lens, and Imgh is half the image height corresponding to the maximum field of view of the optical system. Satisfying this relationship and properly controlling the parameter ratios of the seventh and eighth lenses and Imgh allows for a smooth transition of light rays as they reach the image plane height after passing through the seventh and eighth lenses, resulting in a more stable light path. If (SD71 + SD81) / Imgh > 1.2, the light rays may become too steep after passing through the seventh and eighth lenses, making it difficult for them to smoothly transition to the image plane. If (SD71 + SD81) / Imgh < 1.0, the light rays may transition to the image plane at a large angle after a smooth transition through the seventh and eighth lenses, leading to mismatch with the appropriate image sensor and poor imaging information.

[0012] In one embodiment, the optical system satisfies the relationship: -2 < f7 / f8 < -1; f7 is the effective focal length of the seventh lens, and f8 is the effective focal length of the eighth lens. The seventh lens provides positive refractive power, which converges light and facilitates light collection. The eighth lens provides negative refractive power, which corrects chromatic aberration caused by the optical system. The combination of positive and negative lenses effectively corrects chromatic aberration and improves image sharpness, satisfying the above relationship. The refractive power values ​​are reasonably matched to achieve the purpose of correcting chromatic aberration and improving image sharpness. If f7 / f8 > -1, the purpose of eliminating chromatic aberration by combining positive and negative lenses is not satisfied; if f7 / f8 < -2, it is not conducive to light convergence, resulting in excessive chromatic aberration in the image.

[0013] In one embodiment, the optical system satisfies the relationship: 1.4 < (ΣCT*EPD) / f < 1.8; ΣCT is the sum of the thicknesses of the first to eighth lenses along the optical axis; EPD is the entrance pupil diameter of the optical system; and f is the effective focal length of the optical system. The focal length and entrance pupil diameter determine the amount of light transmitted by the entire optical system and the sharpness of the captured image. Satisfying the above relationship can effectively correct field curvature, resulting in high image sharpness and no image distortion. If ΣCT*EPD) / f > 1.8, it is easy to cause edge image distortion; if ΣCT*EPD) / f < 1.4, it is easy to cause insufficient depth of field and blurred edge image.

[0014] In one embodiment, the optical system satisfies the relationship: 0.5 < SAG12 / AT12 < 1.1; SAG12 is the sag of the image-side surface of the first lens at its maximum effective aperture, and AT12 is the distance on the optical axis from the image-side surface of the first lens to the object-side surface of the second lens. Satisfying the above relationship, a reasonable ratio of the sag of the image-side surface of the first lens to the maximum air gap between the first and second lenses allows for sufficient tolerance space during lens barrel arrangement, improves field curvature, and avoids image edge distortion. If SAG12 / AT12 > 1.1, it is easy to cause excessive curvature of the object-side surface of the first lens, which is not conducive to the processing and molding of single lenses and increases the assembly difficulty, which is not conducive to improving the assembly process. If SAG12 / AT12 < 0.5, it is easy to cause poor edge-to-lens fit and is not conducive to field curvature correction, resulting in distorted edge images and the formation of distorted images.

[0015] In one embodiment, the optical system satisfies the following relationship: 0.7 mm / rad < SD11 / RAD(FOV) < 1.0 mm / rad; SD11 is the maximum effective half-aperture of the object side of the first lens of the optical system, and RAD(FOV) is the radian value corresponding to the maximum field of view of the optical system. Satisfying the above relationship ensures that a sufficiently large range of light information enters the optical system for imaging. If SDL1 / RAD(FOV) > 1.0 mm / rad, the field of view is easily too small, and the imaging range of the captured image does not achieve the effect of a large field of view. If SDL1 / RAD(FOV) < 0.7 mm / rad, the aperture is too small and the field of view is large, which easily causes severe imaging distortion and distortion of the outer field of view of the captured image.

[0016] In one embodiment, the optical system satisfies the following relationship: 0.3 rad / mm < RAD(FOV) / TTL < 0.45 rad / mm; where RAD(FOV) is the radian value corresponding to the maximum field of view of the optical system, and TTL is the distance on the optical axis from the object side of the first lens to the imaging surface of the optical system. Satisfying the above relationship can simultaneously achieve structural miniaturization and clear images of a wide range of scenes. If RAD(FOV) / TTL > 0.45 rad / mm, the optical system structure is too compact, aberration correction is difficult, and imaging performance degrades. If RAD(FOV) / TTL < 0.3 rad / mm, the optical system is too long and does not meet the miniaturization design requirements.

[0017] In one embodiment, the optical system satisfies the relationship: 1 rad < RAD(FOV) / FNO < 1.2 rad; where RAD(FOV) is the radian value corresponding to the maximum field of view of the optical system, and FNO is the aperture number of the optical system. Satisfying this relationship provides the optical system with an ultra-wide-angle lens, meeting the requirements for high-definition shooting. A reasonable combination of the field of view and the lens aperture number satisfies imaging requirements. If RAD(FOV) / FNO > 1.2 rad, the field of view of the optical system is too large, increasing the difficulty of molding and assembly; if RAD(FOV) / FNO < 1 rad, the field of view is too small, failing to meet the requirements of the ultra-wide-angle, small-head design.

[0018] In one embodiment, the optical system satisfies the relationship: 1.5 rad / mm < RAD(FOV) / f < 1.7 rad / mm; where RAD(FOV) is the radian value of the field of view (FOV) of the optical system, and f is the effective focal length of the optical system. Satisfying the above relationship can meet the requirements of ultra-wide-angle structure and high-definition large scene shooting. If RAD(FOV) / f > 1.6 rad / mm, the optical system structure is too compact, aberration correction is difficult, and imaging performance degrades. If RAD(FOV) / f < 1 rad / mm, it is easy to cause the focal length to be too long, resulting in a shallow depth of field, which does not meet the high-definition requirements.

[0019] In one embodiment, the optical system satisfies the relationship: 2mm < TTL / FNO < 3mm; TTL is the distance on the optical axis from the object side of the first lens to the imaging surface of the optical system, and FNO is the aperture number of the optical system. Satisfying the above relationship can simultaneously meet the requirements of a large aperture and miniaturization design of the lens optical system, providing sufficient light transmission for video shooting and meeting the needs of high-quality and high-definition shooting. If TTL / FNO > 3mm, the optical system is likely to be too long, failing to meet the miniaturization design requirements; if TTL / FNO < 2mm, the light transmission of the optical system is likely to be insufficient, resulting in a decrease in the clarity of the captured image.

[0020] In one embodiment, the optical system satisfies the relationship: 3 < TTL / f < 4; where TTL is the distance along the optical axis from the object-side surface of the first lens to the imaging surface of the optical system, and f is the effective focal length of the optical system. Satisfying this relationship, and reasonably controlling the focal length and the total length of the optical system, not only enables miniaturization of the optical system but also ensures better convergence of light onto the imaging surface. If TTL / f < 3, the optical length of the lens group is too short, which can easily increase the sensitivity of the optical system and hinder the convergence of light on the imaging surface. If TTL / f > 4, the optical length of the lens group is too long, which can easily result in the principal ray entering the imaging surface at too large an angle, preventing edge rays from being imaged onto the photosensitive surface and causing incomplete imaging information.

[0021] In one embodiment, the optical system satisfies the relationship: 135° < FOV < 150°; FOV is the maximum field of view of the optical system. Satisfying the above relationship ensures a large field of view and allows for the capture of a large area of ​​scenery.

[0022] The camera module according to a second aspect of this application includes a photosensitive chip and the optical system described in any one of the above embodiments, wherein the photosensitive chip is disposed on the image side of the optical system. By employing the above-described optical system, the camera module can maintain a wide-angle design while achieving good image quality.

[0023] A terminal device according to a third aspect embodiment of this application includes a fixing member and the aforementioned camera module, wherein the camera module is disposed on the fixing member. The aforementioned camera module can provide good image quality for the terminal device while maintaining a large field of view, thereby reducing obstacles to the wide-angle design of the terminal device.

[0024] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0025] Figure 1 This is a schematic diagram of the optical system provided in the first embodiment of this application;

[0026] Figure 2 This includes the longitudinal spherical aberration map, astigmatism map, and distortion map of the optical system in the first embodiment;

[0027] Figure 3 This is a schematic diagram of the optical system provided in the second embodiment of this application;

[0028] Figure 4 This includes the longitudinal spherical aberration map, astigmatism map, and distortion map of the optical system in the second embodiment;

[0029] Figure 5 This is a schematic diagram of the optical system provided in the third embodiment of this application;

[0030] Figure 6 This includes the longitudinal spherical aberration map, astigmatism map, and distortion map of the optical system in the third embodiment;

[0031] Figure 7 This is a schematic diagram of the optical system provided in the fourth embodiment of this application;

[0032] Figure 8 This includes the longitudinal spherical aberration map, astigmatism map, and distortion map of the optical system in the fourth embodiment;

[0033] Figure 9 This is a schematic diagram of the optical system provided in the fifth embodiment of this application;

[0034] Figure 10 This includes the longitudinal spherical aberration map, astigmatism map, and distortion map of the optical system in the fifth embodiment;

[0035] Figure 11 This is a schematic diagram of the optical system provided in the sixth embodiment of this application;

[0036] Figure 12 This includes the longitudinal spherical aberration diagram, astigmatism diagram, and distortion diagram of the optical system in the sixth embodiment;

[0037] Figure 13 This is a schematic diagram of a camera module provided in one embodiment of this application;

[0038] Figure 14 This is a schematic diagram of a terminal device provided in an embodiment of this application.

[0039] Figure label:

[0040] Optical system 10, camera module 20,

[0041] Optical axis 101, image sensor 210, aperture STO.

[0042] First lens L1: object-side surface S1, image-side surface S2

[0043] Second lens L2: object-side surface S3, image-side surface S4

[0044] Third lens L3: object-side surface S5, image-side surface S6.

[0045] Fourth lens L4: object-side surface S7, image-side surface S8.

[0046] Fifth lens L5: object-side surface S9, image-side surface S10.

[0047] Sixth lens L6: object-side surface S11, image-side surface S12.

[0048] Seventh lens L7: Object-side surface S13, Image-side surface S14.

[0049] Eighth lens L8: object-side surface S15, image-side surface S16.

[0050] Filter 110: Object side surface S17, Image side surface S18,

[0051] Imaging plane S19,

[0052] Terminal equipment 30. Detailed Implementation

[0053] Embodiments of the present invention are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0054] An optical system 10 according to a specific embodiment of the present invention will now be described with reference to the accompanying drawings.

[0055] refer to Figure 1 This application provides an optical system 10 with an eight-lens design. Along the optical axis 101 from the object side to the image side, the optical system 10 sequentially includes a first lens L1 with negative refractive power, a second lens L2 with refractive power, a third lens L3 with refractive power, a fourth lens L4 with positive refractive power, a fifth lens L5 with refractive power, a sixth lens L6 with negative refractive power, a seventh lens with positive refractive power, and an eighth lens with negative refractive power. All lenses in the optical system 10 should be coaxially arranged, and each lens should be able to be installed inside the lens barrel and cooperate with the photosensitive chip 210 to form a camera module.

[0056] The first lens L1 has an object-side surface S1 and an image-side surface S2; the second lens L2 has an object-side surface S3 and an image-side surface S4; the third lens L3 has an object-side surface S5 and an image-side surface S6; the fourth lens L4 has an object-side surface S7 and an image-side surface S8; the fifth lens L5 has an object-side surface S9 and an image-side surface S10; the sixth lens L6 has an object-side surface S11 and an image-side surface S12; the seventh lens L7 has an object-side surface S13 and an image-side surface S14; and the eighth lens has an object-side surface S15 and an image-side surface S16. Simultaneously, the optical system 10 also has an imaging surface S19, located on the image side of the eighth lens L8. Light rays emitted from an on-axis object point at a corresponding object distance can be imaged on the imaging surface S19 after being adjusted by the lenses of the optical system 10.

[0057] Generally, the imaging surface S19 of the optical system 10 coincides with the photosensitive surface of the photosensitive chip 210. It should be noted that in some embodiments, the optical system 10 can be matched with a photosensitive chip 210 having a rectangular photosensitive surface, and the imaging surface S19 of the optical system 10 coincides with the rectangular photosensitive surface of the photosensitive chip 210. In this case, the effective pixel area on the imaging surface S19 of the optical system 10 has a horizontal direction, a vertical direction, and a diagonal direction. In this application, the maximum field of view of the optical system 10 can be understood as the maximum field of view in the diagonal direction of the optical system 10, and ImgH can be understood as half the length of the effective pixel area in the diagonal direction on the imaging surface S19 of the optical system 10. In the embodiments of this application, the object-side surface S1 of the first lens L1 is concave near the optical axis 101, and the image-side surface S2 is concave near the optical axis 101; the object-side surface S3 of the second lens L2 is convex near the optical axis 101, and the image-side surface S4 is concave near the optical axis 101; the object-side surface S7 of the fourth lens L4 is convex near the optical axis 101, and the image-side surface S8 is convex near the optical axis 101; the object-side surface S9 of the fifth lens L5 is concave near the optical axis 101. The object-side surface of the sixth lens L6 is concave at the near-optical axis 101, and the image-side surface S12 is concave at the near-optical axis 101; the object-side surface S13 of the seventh lens L7 is convex at the near-optical axis 101, and the image-side surface S14 is concave at the near-optical axis 101; the object-side surface S15 of the eighth lens L8 is concave at the near-optical axis 101, and the image-side surface S16 is concave at the near-optical axis 101. When describing a lens surface having a certain surface shape near the optical axis 101, it means that the lens surface has that surface shape near the near-optical axis 101.

[0058] In the optical system 10, the first lens L1 has negative refractive power, and the object-side surface S1 is concave at the near-optical axis 101. Combined with the concave image-side surface at the near-optical axis 101, this design enhances the negative refractive power of the first lens L1, facilitating the convergence of large-angle incident light rays and thus reducing the overall length of the optical system 10. By giving the second lens L2 refractive power, the field of view of the optical system 10 is expanded, resulting in a wider field of view. It also corrects spherical aberration caused by light passing through the first lens L1. Furthermore, the object-side surface of the second lens L2... The surface design, with side S3 being convex and side S4 being concave, facilitates a reduction in the front aperture of the optical system 10, further enhancing light convergence and improving its optical performance. The refractive third lens L3 smoothly transitions the incident light, refracted by the first lens L1 and the second lens L2, to the fourth lens L4, reducing the aberration correction pressure on the rear lens group (i.e., the fourth lens L4 to the eighth lens L8), thus improving system resolution and achieving high pixel count. Combined with the positive refractive fourth lens L4, and the fourth lens… The object-side surface S7 and image-side surface S8 of L4 are both convex near the optical axis 101, which is beneficial for correcting astigmatism produced by the object-side lenses (i.e., the first lens L1 to the third lens L3) of the optical system 10. Combined with the refractive power of the fifth lens L5, and the fact that the object-side surface of the fifth lens L5 is concave near the optical axis 101 and the image-side surface is convex, this is beneficial for correcting coma in the optical system 10. The sixth lens L6, with negative refractive power, and the seventh lens L7, with positive refractive power, are beneficial for further correcting coma in the optical system 10 and reducing the image-side eighth lens... The correction pressure of L8, in addition, the object side S11 of the sixth lens L6 is convex and the image side S12 is concave, the object side S13 of the seventh lens L7 is convex and the image side S14 is convex, which is beneficial to correct spherical aberration, astigmatism, field curvature and distortion of the optical system 10. At the same time, the eighth lens L8 with negative refractive power, combined with the surface design of the object side S15 and the image side S16 being concave, can balance the difficult-to-correct aberrations brought about by the convergence of incident light by the first lens L1 to the seventh lens L7, reduce the generation of chromatic aberration and improve the imaging quality of the optical system 10.

[0059] In one embodiment, the optical system 10 satisfies the relationship: -11 < (R11 + R21) / f1 < 0; R11 is the radius of curvature of the object-side surface S1 of the first lens L1 at the optical axis 101, R21 is the radius of curvature of the image-side surface S2 of the first lens L1 at the optical axis 101, and f1 is the effective focal length of the first lens L1. Satisfying this relationship indicates that the radius of curvature of the object-side surface S1 and the radius of curvature of the image-side surface S2 of the first lens L1 are well-matched with the focal length, providing a large field of view for the optical system 10. If (R11 + R21) / f1 > 17, the field of view will be too large, increasing the difficulty of manufacturing; if (R11 + R21) / f1 < -50, the focal length and the radius of curvature of the lens surface will not be well-matched, resulting in a decrease in the imaging performance of the optical system 10 and an increase in astigmatism.

[0060] In one embodiment, the optical system 10 satisfies the relationship: -0.1 < (|R51| - |R52|) / (|R51| + |R52|) < 0.8; R51 is the radius of curvature of the object-side surface S9 of the fifth lens L5 at the optical axis 101, and R52 is the radius of curvature of the image-side surface S10 of the fifth lens L5 at the optical axis 101. Satisfying the above relationship indicates that the radii of curvature of the object-side surface S9 and the image-side surface S10 of the fifth lens L5 are suitable, which can reasonably correct the spherical aberration of the optical system 10, balance the optical path difference of the optical system 10, correct the field curvature, reduce the sensitivity of the optical system 10, and improve assembly stability. If (|R51|-|R52|) / (|R51|+|R52|)>0.8, it is easy to cause excessive field curvature of the optical system. If (|R51|-|R52|) / (|R51|+|R52|)<-0.1, it is easy to cause increased sensitivity of the optical system and reduce production yield.

[0061] In one embodiment, the optical system 10 satisfies the relationship: 1 < ∑ET / ∑CT < 1.2; ∑ET is the sum of the edge thicknesses at the maximum effective aperture of the first lens L1 to the eighth lens L8, where, refer to Appendix Figure 1 To explain the edge thickness, taking the first lens L1 as an example, the edge thickness of the first lens L1 is the distance from the maximum effective aperture of the object side S1 of the first lens L1 to the maximum effective aperture of the image side S2 of the first lens L1 in the direction parallel to the optical axis. The edge thickness is denoted as ET1, and CT is the sum of the thicknesses of the first lens L1 to the eighth lens L8 along the optical axis 101. Satisfying the above relationship can reasonably balance the optical path difference between the central field of view and the edge field of view, effectively improve field curvature, and reduce distortion. If ∑ET / ∑CT > 1.2, the optical path of the edge field of view is easily greater than that of the central ray, resulting in excessive field curvature and causing blurring of the outer field of view image. If ∑ET / ∑CT < 1, the optical path of the edge field of view is easily less than that of the central ray, also resulting in excessive field curvature and causing blurring of the outer field of view image.

[0062] In one embodiment, the optical system 10 satisfies the relationship: 1.0 < (SD71 + SD81) / Imgh < 1.2; SD71 is the maximum effective half-aperture of the object-side surface S13 of the seventh lens L7, SD81 is the maximum effective half-aperture of the object-side surface S15 of the eighth lens L8, and Imgh is half the image height corresponding to the maximum field of view of the optical system 10. Satisfying the above relationship and reasonably controlling the parameter ratios of L7, L8, and Imgh allows light to smoothly transition when it reaches the image plane height after passing through the seventh lens L7 and the eighth lens L8, making the light path more stable. If (SD71 + SD81) / Imgh > 1.2, the light path may be too steep after passing through the seventh lens L7 and the eighth lens L8, making it difficult for the light to smoothly transition to the image plane. If (SD71 + SD81) / Imgh < 1.0, the light may transition to the image plane at a large angle after smoothly passing through the seventh lens L7 and the eighth lens L8, resulting in mismatch with the suitable photosensitive chip 210 and poor imaging information.

[0063] In one embodiment, the optical system 10 satisfies the relationship: -2 < f7 / f8 < -1; f7 is the effective focal length of the seventh lens L7, and f8 is the effective focal length of the eighth lens L8. The seventh lens L7 provides positive refractive power, which converges light and facilitates light collection. The eighth lens L8 provides negative refractive power, which can correct the positional chromatic aberration caused by the optical system 10. The combination of the two lenses, positive and negative, can effectively correct positional chromatic aberration and improve image sharpness, satisfying the above relationship. The refractive power values ​​provided are reasonably matched to achieve the purpose of correcting positional chromatic aberration and improving image sharpness. If f7 / f8 > -1, the purpose of the positive and negative lens combination to eliminate chromatic aberration is not satisfied; if f7 / f8 < -2, it is not conducive to light convergence, resulting in excessive chromatic aberration in the image.

[0064] In one embodiment, the optical system 10 satisfies the relationship: 1.4 < (ΣCT*EPD) / f < 1.8; ΣCT is the sum of the thicknesses of the first lens L1 to the eighth lens L8 on the optical axis 101; EPD is the entrance pupil diameter of the optical system 10; and f is the effective focal length of the optical system 10. The focal length and entrance pupil diameter determine the amount of light transmitted by the entire optical system 10 and the sharpness of the captured image. Satisfying the above relationship can effectively correct field curvature, resulting in high image sharpness and no image distortion. If ΣCT*EPD) / f > 1.8, it is easy to cause edge image distortion; if ΣCT*EPD) / f < 1.4, it is easy to cause the depth of field to be too small and the edge image to be blurry.

[0065] In one embodiment, the optical system 10 satisfies the relationship: 0.5 < SAG12 / AT12 < 1.1; SAG12 is the sag of the image-side surface S2 of the first lens L1 at the maximum effective aperture, as shown in the attached figure. Figure 1To explain the sagittal height, taking the first lens L1 as an example, it is the distance from the intersection of the image side surface S1 of the first lens L1 and the optical axis 101 to the maximum effective aperture of the image side surface S1 of the first lens L1 in the direction parallel to the optical axis.

[0066] AT12 is the distance on the optical axis 101 from the image-side surface S2 of the first lens L1 to the object-side surface S3 of the second lens L2. Satisfying the above relationship, a reasonable ratio of the sag of the image-side surface S2 of the first lens L1 to the maximum air gap between the first lens L1 and the second lens L2 ensures sufficient tolerance space during lens barrel arrangement, improves field curvature, and avoids image edge distortion. If SAG12 / AT12 > 1.1, it easily leads to excessive curvature of the object-side surface S1 of the first lens L1, which is not conducive to the processing and molding of single lenses and increases the difficulty of assembly, hindering the improvement of the assembly process. If SAG12 / AT12 < 0.5, it easily causes poor edge-to-lens fit and is not conducive to field curvature correction, resulting in distorted edge images and the formation of distorted images.

[0067] In one embodiment, the optical system 10 satisfies the following relationship: 0.7 mm / rad < SD11 / RAD(FOV) < 1.0 mm / rad; SD11 is the maximum effective half-aperture of the object side surface S1 of the first lens L1 of the optical system 10, and RAD(FOV) is the radian value corresponding to the maximum field of view of the optical system 10. Satisfying the above relationship ensures that a sufficiently large range of light information enters the optical system 10 for imaging. If SDL1 / RAD(FOV) > 1.0 mm / rad, the field of view is easily too small, and the imaging range of the captured image does not achieve the effect of a large field of view. If SDL1 / RAD(FOV) < 0.7 mm / rad, the aperture is too small and the field of view is large, which easily causes severe imaging distortion and distortion of the outer field of view of the captured image.

[0068] In one embodiment, the optical system 10 satisfies the following relationship: 0.3 rad / mm < RAD(FOV) / TTL < 0.45 rad / mm; RAD(FOV) is the radian value corresponding to the maximum field of view of the optical system 10, and TTL is the distance on the optical axis 101 from the object side S1 of the first lens L1 to the imaging surface S19 of the optical system 10. Satisfying the above relationship can simultaneously satisfy the requirements of structural miniaturization and clear images of a wide range of scenes. If RAD(FOV) / TTL > 0.45 rad / mm, the optical system 10 is too compact, aberration correction is difficult, and imaging performance degrades. If RAD(FOV) / TTL < 0.3 rad / mm, the optical system 10 is too long and does not meet the miniaturization design requirements.

[0069] In one embodiment, the optical system 10 satisfies the relationship: 1 rad < RAD(FOV) / FNO < 1.2 rad; where RAD(FOV) is the radian value corresponding to the maximum field of view of the optical system 10, and FNO is the aperture number of the optical system 10. By satisfying this relationship, the optical system 10 has an ultra-wide-angle lens, meeting the requirements for high-definition shooting. A reasonable combination of the field of view and the lens aperture number satisfies the imaging requirements. If RAD(FOV) / FNO > 1.2 rad, the field of view of the optical system 10 is too large, increasing the difficulty of molding and assembly; if RAD(FOV) / FNO < 1 rad, the field of view is too small, failing to meet the requirements of the ultra-wide-angle, small-head design.

[0070] In one embodiment, the optical system 10 satisfies the relationship: 1.5 rad / mm < RAD(FOV) / f < 1.7 rad / mm; where RAD(FOV) is the radian value corresponding to the maximum field of view of the optical system 10, and f is the effective focal length of the optical system 10. Satisfying the above relationship can meet the requirements of ultra-wide-angle structure and high-definition large scene shooting. If RAD(FOV) / f > 1.6 rad / mm, the structure of the optical system 10 is too compact, aberration correction is difficult, and imaging performance degrades. If RAD(FOV) / f < 1 rad / mm, it is easy to cause the focal length to be too long, resulting in a shallow depth of field, which does not meet the high-definition requirements.

[0071] In one embodiment, the optical system 10 satisfies the relationship: 2mm < TTL / FNO < 3mm; TTL is the distance on the optical axis 101 from the object side surface S1 of the first lens L1 to the imaging surface S19 of the optical system 10, and FNO is the aperture number of the optical system 10. Satisfying the above relationship can simultaneously meet the requirements of a large aperture and miniaturization design of the lens optical system 10, providing sufficient light transmission for video shooting and meeting the needs of high-quality and high-definition shooting. If TTL / FNO > 3mm, the optical system 10 is likely to be too long and cannot meet the miniaturization design requirements; if TTL / FNO < 2mm, the light transmission of the optical system 10 is likely to be insufficient, resulting in a decrease in the clarity of the captured image.

[0072] In one embodiment, the optical system 10 satisfies the relationship: 3 < TTL / f < 4; TTL is the distance on the optical axis 101 from the object side S1 of the first lens L1 to the imaging surface S19 of the optical system 10, and f is the effective focal length of the optical system 10. Satisfying the above relationship and reasonably controlling the focal length and the total length of the optical system 10 not only enables the miniaturization of the optical system 10 but also ensures better convergence of light on the imaging surface S19. If TTL / f < 3, the optical length of the lens group is too short, which can easily increase the sensitivity of the optical system 10 and is not conducive to the convergence of light on the imaging surface S19. If TTL / f > 4, the optical length of the lens group is too long, which can easily cause the principal ray angle of the light entering the imaging surface S19 to be too large, and the edge rays of the imaging surface S19 of the optical system 10 cannot be imaged on the photosensitive surface, resulting in incomplete imaging information.

[0073] In one embodiment, the optical system 10 satisfies the relationship: 135° < FOV < 150°; FOV is the maximum field of view of the optical system 10. Satisfying the above relationship ensures a large field of view and allows for the capture of a larger area of ​​scenery.

[0074] The focal length values ​​in the above relational conditions refer to a wavelength of 587.6 nm. The focal length refers at least to the value of the corresponding lens at the optical axis 101, and the refractive power of the lens refers at least to the case at the optical axis 101. Furthermore, the above relational conditions and their resulting technical effects apply to the optical system 10 with the aforementioned lens design. If the lens design (number of lenses, refractive power configuration, surface configuration, etc.) of the aforementioned optical system 10 cannot be guaranteed, it will be difficult to ensure that the optical system 10 will still possess the corresponding technical effects while satisfying these relational conditions, and it may even lead to a significant decrease in imaging performance.

[0075] In some embodiments, at least one lens of the optical system 10 has an aspherical surface profile. A lens is said to have an aspherical surface profile when at least one surface (object-side or image-side) of the lens is aspherical. In one embodiment, both the object-side and image-side surfaces of each lens can be designed as aspherical. Aspherical design helps the optical system 10 more effectively eliminate aberrations and improve image quality. In some embodiments, at least one lens in the optical system 10 may also have a spherical surface profile. A spherical surface profile design can reduce the difficulty and cost of lens fabrication. In some embodiments, to balance fabrication cost, fabrication difficulty, image quality, and assembly difficulty, the surface design of each lens in the optical system 10 can be a combination of aspherical and spherical surface profiles.

[0076] The surface shape of aspherical surfaces can be calculated using the aspherical formula:

[0077]

[0078] Where Z is the distance from the corresponding point on the aspherical surface to the tangent plane of the surface at the optical axis 101, r is the distance from the corresponding point on the aspherical surface to the optical axis 101, c is the curvature of the aspherical surface at the optical axis 101, k is the conic coefficient, and Ai is the coefficient of the higher-order term corresponding to the i-th higher-order term in the aspherical surface shape formula.

[0079] It should also be noted that when a lens surface is aspherical, it may have a point of inversion. In this case, the surface shape will change radially. For example, a lens surface may be convex at the optical axis 101 and concave near the circumference. Specifically, in some embodiments, at least one point of inversion is provided in both the object-side surface S11 and the image-side surface S12 of the sixth lens L6. In this case, combined with the surface shape design of the object-side surface S11 and the image-side surface S12 of the sixth lens L6 at the optical axis 101, it is possible to achieve good correction of field curvature and distortion aberrations in the edge field of view of a large-angle system, thereby improving image quality.

[0080] In some embodiments, at least one lens in the optical system 10 is made of plastic (PC, Plastic), such as polycarbonate or resin. In some embodiments, at least one lens in the optical system 10 is made of glass (GL, Glass). Lenses made of plastic can reduce the production cost of the optical system 10, while lenses made of glass can withstand higher or lower temperatures and have excellent optical performance and better stability. In some embodiments, the optical system 10 can be equipped with lenses of different materials, such as a combination of glass and plastic lenses, but the specific configuration can be determined according to actual needs and will not be exhaustively listed here.

[0081] In some embodiments, the optical system 10 further includes an aperture stop STO. The aperture stop in this application can also be a field stop. The aperture stop STO is used to control the amount of light entering the optical system 10 and the depth of field, while also effectively blocking ineffective light rays to improve the imaging quality of the optical system 10. It can be disposed between the object side of the optical system 10 and the object side surface S1 of the first lens L1. It is understood that in other embodiments, the aperture stop STO can also be disposed between two adjacent lenses, for example, between the second lens L2 and the third lens L3. The placement can be adjusted according to actual conditions, and this embodiment does not specifically limit this. The aperture stop STO can also be formed by a lens clamping member.

[0082] The optical system 10 of this application will be described below through more specific embodiments:

[0083] First Embodiment

[0084] refer to Figure 1In the first embodiment, the optical system 10, along the optical axis 101 from the object side to the image side, sequentially includes: a first lens L1 with negative refractive power, a second lens L2 with positive refractive power, a third lens L3 with positive refractive power, an aperture stop ST0, a fourth lens L4 with positive refractive power, a fifth lens L5 with positive refractive power, a sixth lens L6 with negative refractive power, a seventh lens L7 with positive refractive power, and an eighth lens L8 with negative refractive power. The surface shapes of each lens in the optical system 10 are as follows:

[0085] The object-side surface S1 of the first lens L1 is concave near the optical axis 101, and the image-side surface S2 is concave near the optical axis 101.

[0086] The object-side surface S3 of the second lens L2 is convex near the optical axis 101, and the image-side surface S4 is concave near the optical axis 101.

[0087] The object-side surface S5 of the third lens L3 is concave near the optical axis 101, and the image-side surface S6 is convex near the optical axis 101.

[0088] The object-side surface S7 of the fourth lens L4 is convex at near the optical axis 101, and the image-side surface S8 is convex at near the optical axis 101.

[0089] The object-side surface S9 of the fifth lens L5 is concave near the optical axis 101, and the image-side surface S10 is convex near the optical axis 101.

[0090] The object-side surface S11 of the sixth lens L6 is convex near the optical axis 101, and the image-side surface S12 is concave near the optical axis 101.

[0091] The object-side surface S13 of the seventh lens L7 is convex near the optical axis 101, and the image-side surface S14 is convex near the optical axis 101.

[0092] The object-side surface S15 of the eighth lens L8 is concave near the optical axis 101, and the image-side surface S16 is concave near the optical axis 101.

[0093] In the first embodiment, the surfaces of all lenses in the first lens L1 to the eighth lens L8 are aspherical, and the material of all lenses in the first lens L1 to the eighth lens L8 is plastic (PC). The optical system 10 also includes a filter 110, which can be part of the optical system 10 or removed from the optical system 10. However, when the filter 110 is removed, the total optical length (TTL) of the optical system 10 remains unchanged. In this embodiment, the filter 110 is an infrared cut-off filter, which is disposed between the image-side surface S16 of the eighth lens L8 and the imaging surface S19 of the optical system 10. This filter can filter out invisible light such as infrared light, allowing only visible light to pass through, thereby obtaining a better image effect. It can be understood that the filter 110 can also filter out other light such as visible light, allowing only infrared light to pass through. The optical system 10 can be used as an infrared optical lens, that is, the optical system 10 can also form an image and obtain a better image effect in dim environments and other special application scenarios.

[0094] In the first embodiment, the lens parameters of the optical system 10 are shown in Table 1 below. The elements of the optical system 10 from the object side to the image side are arranged sequentially from top to bottom according to Table 1, where the aperture stop STO represents the aperture stop. In Table 1, the Y-radius is the radius of curvature of the corresponding lens surface at the optical axis 101. In Table 1, the surface with surface number S1 represents the object side of the first lens L1, the surface with surface number S2 represents the image side of the first lens L1, and so on. The absolute value of the first value in the "thickness" parameter column is the thickness of the lens on the optical axis 101, and the absolute value of the second value is the distance from the image side of the lens to the next optical surface (the object side of the next lens or the aperture stop surface) on the optical axis 101, where the aperture stop thickness parameter represents the distance from the aperture stop surface to the object side of the adjacent lens on the image side on the optical axis 101. In the table, the reference wavelengths for the refractive index and Abbe number of each lens are 587.6 nm, and the reference wavelength for the focal length is 587.6 nm. The units for the Y-radius, thickness, and focal length are all millimeters (mm). The parameter data and lens surface structure used for formula calculations in the following embodiments are based on the data in the lens parameter tables of the corresponding embodiments.

[0095] Table 1

[0096]

[0097] As shown in Table 1, the effective focal length f of the optical system 10 in the first embodiment is 1.57 mm, the aperture number FNO is 2.24, and the total optical length TTL is 5.90 mm. The total optical length TTL values ​​in the following embodiments are the sum of the thickness values ​​corresponding to the surface numbers S1 to S19. The maximum field of view FOV of the optical system 10 is 142.00°.

[0098] Table 2 below shows the aspherical coefficients of the corresponding lens surfaces in Table 1, where K is the conic coefficient and Ai is the coefficient corresponding to the i-th higher-order term in the aspherical surface shape formula.

[0099] Table 2

[0100] Face number K A4 A6 A8 A10 S1 -1.8049E+01 1.5965E-01 -1.2827E-01 8.0860E-02 -3.7135E-02 S2 -4.8091E+01 5.8178E-01 -9.6581E-01 2.8170E+00 -7.1024E+00 S3 -5.4049E+01 1.4668E-01 -5.1047E-01 1.2830E+00 -2.8660E+00 S4 0.0000E+00 4.5992E-02 6.8926E-03 -1.6368E-03 -5.5928E-05 S5 0.0000E+00 6.8521E-02 3.0460E-03 -1.8378E-02 1.1094E-02 S6 -1.5037E+01 4.8165E-01 -1.8898E+00 7.6103E+00 -2.1393E+01 S7 9.5144E+00 5.7146E-01 -1.8514E+00 2.5207E+00 3.7613E+01 S8 0.0000E+00 3.4013E-02 1.7688E-01 2.7280E-01 -2.3937E-02 S9 0.0000E+00 -2.3336E-02 -1.2819E-01 -1.2000E-01 -2.6810E-01 S10 -8.7131E+00 -6.7659E-01 1.4071E+00 -5.4287E+00 1.8167E+01 S11 -9.7000E+01 -6.4561E-01 8.9033E-01 -2.8644E+00 5.1923E+00 S12 -2.2802E+01 -3.5131E-01 4.1078E-01 3.3608E-02 -2.2424E+00 S13 -9.8990E+01 -9.3243E-02 1.2069E-01 1.6169E+00 -6.7067E+00 S14 -5.2165E+00 -2.5114E-01 3.6261E-01 -1.5448E-01 -3.3405E-01 S15 7.2606E+01 -6.2786E-01 7.8567E-01 -5.5342E-01 -2.5711E-01 S16 -8.5668E+00 -3.3248E-01 5.0442E-01 -5.6755E-01 4.5151E-01 Face number A12 A14 A16 A18 A20 S1 1.1873E-02 -2.5402E-03 3.4415E-04 -2.6500E-05 8.7854E-07 S2 1.2626E+01 -1.4676E+01 1.0569E+01 -4.2787E+00 7.4315E-01 S3 4.5503E+00 -4.8980E+00 3.3578E+00 -1.2996E+00 2.1407E-01 S4 1.9605E-15 1.2934E-16 7.8904E-18 4.8094E-19 2.9356E-20 S5 2.1226E-15 1.2919E-16 7.8904E-18 4.8094E-19 2.9356E-20 S6 3.2645E+01 -3.8237E-01 -9.0743E+01 1.4122E+02 -7.2138E+01 S7 -3.2901E+02 1.3375E+03 -3.0763E+03 3.8396E+03 -2.0310E+03 S8 2.1214E-15 1.2918E-16 7.8812E-18 4.8094E-19 2.9356E-20 S9 2.1189E-15 1.2918E-16 7.8812E-18 4.8094E-19 2.9356E-20 S10 -5.4380E+01 1.2825E+02 -2.0985E+02 2.0272E+02 -8.6116E+01 S11 -2.2977E+00 -1.1536E+01 3.4104E+01 -3.9935E+01 1.6936E+01 S12 5.2227E+00 -5.3891E+00 2.8724E+00 -8.4215E-01 1.3220E-01 S13 1.2582E+01 -1.3525E+01 8.6270E+00 -3.0635E+00 4.6973E-01 S14 9.6889E-01 -1.3704E+00 1.0844E+00 -4.4176E-01 7.1857E-02 S15 9.8821E-01 -1.1479E+00 7.8298E-01 -2.9221E-01 4.4726E-02 S16 -2.5732E-01 1.0326E-01 -2.7638E-02 4.4191E-03 -3.1823E-04

[0101] Figure 2 This includes the longitudinal spherical aberration diagram, astigmatism diagram, and distortion diagram of the optical system 10 in the first embodiment. The reference wavelength for the astigmatism and distortion diagrams is 587.6 nm. The longitudinal spherical aberration diagram shows the deviation of the convergence focus of light rays of different wavelengths after passing through the lens. The vertical axis of the longitudinal spherical aberration diagram represents the normalized pupil coordinates from the pupil center to the pupil edge, and the horizontal axis represents the distance (in mm) from the imaging plane S19 to the intersection of the light ray and the perioptic axis 101. As can be seen from the longitudinal spherical aberration diagram, the degree of convergence focus deviation of light rays of different wavelengths in the first embodiment tends to be consistent, and the maximum focus deviation of each reference wavelength is controlled within ±0.05 mm. For the miniaturized optical system 10, blur spots or halos in the image are effectively suppressed. Figure 2 It also includes astigmatic field curves of the optical system 10, where the horizontal axis along the X-axis represents the focal shift in mm, the vertical axis along the Y-axis represents the image height in mm, the S-curve represents the sagittal field curve at 587.6 nm, and the T-curve represents the meridional field curve at 587.6 nm. Figure 2 As can be seen, the field curvature of the optical system 10 is relatively small, with the maximum field curvature controlled within ±0.02 mm. For the optical system, the curvature of the image plane is effectively suppressed, and the sagittal and meridional field curvatures under each field of view tend to be consistent. Astigmatism in each field of view is well controlled. Therefore, it can be concluded that the optical system 10 has clear imaging from the center to the edge of the field of view. In addition, according to the distortion diagram, the horizontal axis along the X-axis represents distortion in percentage, and the vertical axis along the Y-axis represents image height in mm. The distortion degree of the miniaturized optical system 10 is also well controlled.

[0102] Second Embodiment

[0103] refer to Figure 3In the second embodiment, the optical system 10, along the optical axis 101 from the object side to the image side, sequentially includes: a first lens L1 with negative refractive power, a second lens L2 with positive refractive power, a third lens L3 with positive refractive power, an aperture stop ST0, a fourth lens L4 with positive refractive power, a fifth lens L5 with positive refractive power, a sixth lens L6 with negative refractive power, a seventh lens L7 with positive refractive power, and an eighth lens L8 with negative refractive power. The surface shapes of each lens in the optical system 10 are as follows:

[0104] The object-side surface S1 of the first lens L1 is concave near the optical axis 101, and the image-side surface S2 is concave near the optical axis 101.

[0105] The object-side surface S3 of the second lens L2 is convex near the optical axis 101, and the image-side surface S4 is concave near the optical axis 101.

[0106] The object-side surface S5 of the third lens L3 is concave near the optical axis 101, and the image-side surface S6 is convex near the optical axis 101.

[0107] The object-side surface S7 of the fourth lens L4 is convex at near the optical axis 101, and the image-side surface S8 is convex at near the optical axis 101.

[0108] The object-side surface S9 of the fifth lens L5 is concave near the optical axis 101, and the image-side surface S10 is convex near the optical axis 101.

[0109] The object-side surface S11 of the sixth lens L6 is convex near the optical axis 101, and the image-side surface S12 is concave near the optical axis 101.

[0110] The object-side surface S13 of the seventh lens L7 is convex near the optical axis 101, and the image-side surface S14 is convex near the optical axis 101.

[0111] The object-side surface S15 of the eighth lens L8 is concave near the optical axis 101, and the image-side surface S16 is concave near the optical axis 101.

[0112] In this embodiment, the parameters of each lens of the optical system 10 are given in Table 2. The names of each component and the definitions of the parameters can be derived from the first embodiment, and will not be repeated here.

[0113]

[0114] Tables 3 and 4

[0115]

[0116]

[0117] Face number A12 A14 A16 A18 A20 S1 2.5486E-02 -5.9883E-03 8.8845E-04 -7.5293E-05 2.7795E-06 S2 2.0037E+01 -2.1607E+01 1.4290E+01 -5.2525E+00 8.1859E-01 S3 3.2289E+00 -2.7273E+00 1.4955E+00 -4.8400E-01 7.0525E-02 S4 3.7663E-15 2.5972E-16 1.7299E-17 1.1633E-18 7.8854E-20 S5 3.8741E-15 2.5875E-16 1.7298E-17 1.1633E-18 7.8854E-20 S6 3.6319E+02 -9.6758E+02 1.6179E+03 -1.5257E+03 6.1614E+02 S7 3.7028E+02 -1.3623E+03 3.1480E+03 -4.0044E+03 2.1197E+03 S8 3.9095E-15 2.5888E-16 1.7289E-17 1.1633E-18 7.8854E-20 S9 3.9070E-15 2.5887E-16 1.7289E-17 1.1633E-18 7.8854E-20 S10 -6.7178E+01 2.7164E+02 -6.0805E+02 7.0941E+02 -3.3721E+02 S11 -1.1906E+02 2.9310E+02 -4.4016E+02 3.6659E+02 -1.3141E+02 S12 7.6894E+00 -9.1005E+00 5.7237E+00 -1.8868E+00 2.5918E-01 S13 1.6564E+01 -1.9060E+01 1.2884E+01 -4.8088E+00 7.6885E-01 S14 -1.8990E+00 1.2485E+00 -3.1998E-01 -3.5422E-02 2.3057E-02 S15 -2.9252E+00 2.5091E+00 -1.1615E+00 2.5524E-01 -1.8495E-02 S16 6.4439E-02 -4.5385E-02 1.5573E-02 -2.7301E-03 1.9231E-04

[0118] Depend on Figure 4 As can be seen from the various aberration diagrams, the longitudinal spherical aberration, astigmatism, and distortion of the optical system 10 are well controlled, and the optical system 10 of this embodiment can have good imaging quality.

[0119] Third Embodiment

[0120] refer to Figure 5 In the third embodiment, the optical system 10, along the optical axis 101 from the object side to the image side, sequentially includes: a first lens L1 with negative refractive power, a second lens L2 with positive refractive power, a third lens L3 with positive refractive power, an aperture stop ST0, a fourth lens L4 with positive refractive power, a fifth lens L5 with positive refractive power, a sixth lens L6 with negative refractive power, a seventh lens L7 with positive refractive power, and an eighth lens L8 with negative refractive power. The surface shapes of each lens in the optical system 10 are as follows:

[0121] The object-side surface S1 of the first lens L1 is concave near the optical axis 101, and the image-side surface S2 is concave near the optical axis 101.

[0122] The object-side surface S3 of the second lens L2 is convex near the optical axis 101, and the image-side surface S4 is concave near the optical axis 101.

[0123] The object-side surface S5 of the third lens L3 is convex near the optical axis 101, and the image-side surface S6 is concave near the optical axis 101.

[0124] The object-side surface S7 of the fourth lens L4 is convex at near the optical axis 101, and the image-side surface S8 is convex at near the optical axis 101.

[0125] The object-side surface S9 of the fifth lens L5 is concave near the optical axis 101, and the image-side surface S10 is convex near the optical axis 101.

[0126] The object-side surface S11 of the sixth lens L6 is convex near the optical axis 101, and the image-side surface S12 is concave near the optical axis 101.

[0127] The object-side surface S13 of the seventh lens L7 is convex near the optical axis 101, and the image-side surface S14 is convex near the optical axis 101.

[0128] The object-side surface S15 of the eighth lens L8 is concave near the optical axis 101, and the image-side surface S16 is concave near the optical axis 101.

[0129] In this embodiment, the lens parameters of the optical system 10 are given in Table 3. The names and definitions of each component and parameter can be derived from the first embodiment and will not be repeated here.

[0130] Table 5

[0131]

[0132]

[0133] Table 6

[0134]

[0135]

[0136] Depend on Figure 6 As can be seen from the various aberration diagrams, the longitudinal spherical aberration, astigmatism, and distortion of the optical system 10 are well controlled, and the optical system 10 of this embodiment can have good imaging quality.

[0137] Fourth embodiment

[0138] refer to Figure 7 In the fourth embodiment, the optical system 10, along the optical axis 101 from the object side to the image side, sequentially includes: a first lens L1 with negative refractive power, a second lens L2 with positive refractive power, a third lens L3 with negative refractive power, an aperture stop ST0, a fourth lens L4 with positive refractive power, a fifth lens L5 with positive refractive power, a sixth lens L6 with negative refractive power, a seventh lens L7 with positive refractive power, and an eighth lens L8 with negative refractive power. In the fourth embodiment,

[0139] The object-side surface S1 of the first lens L1 is concave near the optical axis 101, and the image-side surface S2 is concave near the optical axis 101.

[0140] The object-side surface S3 of the second lens L2 is convex near the optical axis 101, and the image-side surface S4 is concave near the optical axis 101.

[0141] The object-side surface S5 of the third lens L3 is concave near the optical axis 101, and the image-side surface S6 is convex near the optical axis 101.

[0142] The object-side surface S7 of the fourth lens L4 is convex at near the optical axis 101, and the image-side surface S8 is convex at near the optical axis 101.

[0143] The object-side surface S9 of the fifth lens L5 is concave near the optical axis 101, and the image-side surface S10 is convex near the optical axis 101.

[0144] The object-side surface S11 of the sixth lens L6 is convex near the optical axis 101, and the image-side surface S12 is concave near the optical axis 101.

[0145] The object-side surface S13 of the seventh lens L7 is convex near the optical axis 101, and the image-side surface S14 is convex near the optical axis 101.

[0146] The object-side surface S15 of the eighth lens L8 is concave near the optical axis 101, and the image-side surface S16 is concave near the optical axis 101.

[0147] In this embodiment, the lens parameters of the optical system 10 are given in Table 4. The names and definitions of each component and parameter can be derived from the first embodiment and will not be repeated here.

[0148] Table 7

[0149]

[0150]

[0151] Table 8

[0152] Face number K A4 A6 A8 A10 S1 -1.8029E+01 1.6123E-01 -1.3622E-01 8.8764E-02 -4.1750E-02 S2 -4.4284E+01 5.9966E-01 -1.0557E+00 3.0385E+00 -7.6086E+00 S3 -6.5058E+01 1.6149E-01 -6.3735E-01 1.6183E+00 -3.4548E+00 S4 0.0000E+00 2.5105E-02 -1.4478E-02 -7.7372E-03 1.3172E-02 S5 0.0000E+00 6.5540E-02 -3.1405E-02 -4.5291E-02 6.4430E-03 S6 -9.3174E+00 5.3378E-01 -2.7247E+00 1.5529E+01 -7.7668E+01 S7 7.6268E+00 5.9451E-01 -2.7028E+00 1.0839E+01 -1.9984E+01 S8 0.0000E+00 4.4767E-02 2.0767E-01 1.7905E-01 1.0757E-02 S9 0.0000E+00 -3.1889E-02 -1.6170E-01 -9.0026E-02 -3.8933E-01 S10 -8.7839E+00 -6.6406E-01 1.3679E+00 -5.7363E+00 2.1354E+01 S11 -9.7000E+01 -6.6164E-01 9.5794E-01 -3.1309E+00 7.7604E+00 S12 -2.5195E+01 -3.5625E-01 2.4505E-01 1.1352E+00 -5.9576E+00 S13 -9.8990E+01 -7.9513E-02 -1.3800E-01 2.8500E+00 -1.0164E+01 S14 -6.2296E+00 -2.6287E-01 4.3191E-01 -3.0664E-01 -6.6241E-02 S15 6.8613E+01 -5.0258E-01 5.4674E-01 -3.4317E-01 -1.0332E-01 S16 -8.5300E+00 -2.7690E-01 3.7311E-01 -3.7059E-01 2.4814E-01 Face number A12 A14 A16 A18 A20 S1 1.3614E-02 -2.9576E-03 4.0438E-04 -3.1169E-05 1.0221E-06 S2 1.3417E+01 -1.5452E+01 1.1003E+01 -4.3878E+00 7.4758E-01 S3 5.2210E+00 -5.2290E+00 3.2965E+00 -1.1777E+00 1.8106E-01 S4 1.1819E-15 1.5921E-16 1.0103E-17 6.4348E-19 4.0884E-20 S5 2.7454E-15 1.6184E-16 1.0182E-17 6.4348E-19 4.0884E-20 S6 3.1000E+02 -9.2868E+02 1.8998E+03 -2.3075E+03 1.2348E+03 S7 -4.4305E+01 3.5178E+02 -8.2928E+02 8.3860E+02 -2.6569E+02 S8 1.7471E-15 1.6150E-16 1.0173E-17 6.4348E-19 4.0884E-20 S9 3.5881E-15 1.3240E-16 1.0173E-17 6.4348E-19 4.0884E-20 S10 -6.8823E+01 1.6458E+02 -2.6118E+02 2.3961E+02 -9.6138E+01 S11 -1.6375E+01 3.2133E+01 -4.4244E+01 3.5198E+01 -1.2824E+01 S12 1.3026E+01 -1.5619E+01 1.1007E+01 -4.4260E+00 7.9981E-01 S13 1.8659E+01 -2.0160E+01 1.3001E+01 -4.6641E+00 7.1933E-01 S14 5.7058E-01 -9.8066E-01 8.9546E-01 -4.1237E-01 7.4483E-02 S15 2.5288E-01 -1.0721E-01 3.2196E-02 -1.9945E-02 5.4370E-03 S16 -1.1282E-01 3.4903E-02 -7.1718E-03 9.1238E-04 -5.6186E-05

[0153] Depend on Figure 8 As can be seen from the various aberration diagrams, the longitudinal spherical aberration, astigmatism, and distortion of the optical system 10 are well controlled, and the optical system 10 of this embodiment can have good imaging quality.

[0154] Fifth embodiment

[0155] refer to Figure 9 In the fifth embodiment, the optical system 10, along the optical axis 101 from the object side to the image side, sequentially includes: a first lens L1 with negative refractive power, a second lens L2 with negative refractive power, a third lens L3 with positive refractive power, an aperture stop ST0, a fourth lens L4 with positive refractive power, a fifth lens L5 with positive refractive power, a sixth lens L6 with negative refractive power, a seventh lens L7 with positive refractive power, and an eighth lens L8 with negative refractive power. The surface shapes of each lens in the optical system 10 are as follows:

[0156] The object-side surface S1 of the first lens L1 is concave near the optical axis 101, and the image-side surface S2 is concave near the optical axis 101.

[0157] The object-side surface S3 of the second lens L2 is convex near the optical axis 101, and the image-side surface S4 is concave near the optical axis 101.

[0158] The object-side surface S5 of the third lens L3 is concave near the optical axis 101, and the image-side surface S6 is convex near the optical axis 101.

[0159] The object-side surface S7 of the fourth lens L4 is convex at near the optical axis 101, and the image-side surface S8 is convex at near the optical axis 101.

[0160] The object-side surface S9 of the fifth lens L5 is concave near the optical axis 101, and the image-side surface S10 is convex near the optical axis 101.

[0161] The object-side surface S11 of the sixth lens L6 is convex near the optical axis 101, and the image-side surface S12 is concave near the optical axis 101.

[0162] The object-side surface S13 of the seventh lens L7 is convex near the optical axis 101, and the image-side surface S14 is convex near the optical axis 101.

[0163] The object-side surface S15 of the eighth lens L8 is concave near the optical axis 101, and the image-side surface S16 is concave near the optical axis 101.

[0164] In this embodiment, the lens parameters of the optical system 10 are given by 5, wherein the names of each component and the definitions of the parameters can be derived from the first embodiment and will not be repeated here.

[0165] Table 9

[0166]

[0167] Table 10

[0168]

[0169]

[0170] Depend on Figure 10 As can be seen from the various aberration diagrams, the longitudinal spherical aberration, astigmatism, and distortion of the optical system 10 are well controlled, and the optical system 10 of this embodiment can have good imaging quality.

[0171] Sixth Embodiment

[0172] refer to Figure 11 In the sixth embodiment, the optical system 10, along the optical axis 101 from the object side to the image side, sequentially includes: a first lens L1 with negative refractive power, a second lens L2 with positive refractive power, a third lens L3 with negative refractive power, an aperture stop ST0, a fourth lens L4 with positive refractive power, a fifth lens L5 with negative refractive power, a sixth lens L6 with negative refractive power, a seventh lens L7 with positive refractive power, and an eighth lens L8 with negative refractive power. The surface shapes of each lens in the optical system 10 are as follows:

[0173] The object-side surface S1 of the first lens L1 is concave near the optical axis 101, and the image-side surface S2 is concave near the optical axis 101.

[0174] The object-side surface S3 of the second lens L2 is convex near the optical axis 101, and the image-side surface S4 is concave near the optical axis 101.

[0175] The object-side surface S5 of the third lens L3 is concave near the optical axis 101, and the image-side surface S6 is convex near the optical axis 101.

[0176] The object-side surface S7 of the fourth lens L4 is convex at near the optical axis 101, and the image-side surface S8 is convex at near the optical axis 101.

[0177] The object-side surface S9 of the fifth lens L5 is concave near the optical axis 101, and the image-side surface S10 is convex near the optical axis 101.

[0178] The object-side surface S11 of the sixth lens L6 is convex near the optical axis 101, and the image-side surface S12 is concave near the optical axis 101.

[0179] The object-side surface S13 of the seventh lens L7 is convex near the optical axis 101, and the image-side surface S14 is convex near the optical axis 101.

[0180] The object-side surface S15 of the eighth lens L8 is concave near the optical axis 101, and the image-side surface S16 is concave near the optical axis 101.

[0181] In this embodiment, the lens parameters of the optical system 10 are given by 5, wherein the names of each component and the definitions of the parameters can be derived from the first embodiment and will not be repeated here.

[0182] Table 11

[0183]

[0184]

[0185] Table 12

[0186] Face number K A4 A6 A8 A10 S1 -1.9664E+01 1.4333E-01 -1.2179E-01 7.9698E-02 -3.7602E-02 S2 -6.4722E+01 6.8452E-01 -1.3917E+00 3.7996E+00 -8.8223E+00 S3 -5.8279E+01 1.5743E-01 -7.3066E-01 1.9065E+00 -4.1650E+00 S4 -2.4598E+01 -1.6037E-02 -3.1066E-02 1.0404E-02 2.8087E-02 S5 -4.2997E-01 1.0921E-02 -9.8366E-02 7.8246E-02 -9.0569E-02 S6 3.7467E+00 4.8118E-01 -4.6420E+00 3.8337E+01 -2.2620E+02 S7 4.0055E+00 4.8949E-01 -5.1330E+00 3.9570E+01 -2.1278E+02 S8 -1.8630E-01 7.5046E-02 8.8536E-02 -1.1328E-01 5.4494E-01 S9 -4.1232E-02 -3.6628E-02 -2.2489E-01 -2.3949E-01 3.5215E-01 S10 -4.4968E+00 -6.2267E-01 1.4719E+00 -6.2693E+00 2.1227E+01 S11 -9.2541E+01 -6.2831E-01 1.0725E+00 -2.4525E+00 2.0711E+00 S12 -1.2687E+01 -3.3954E-01 6.3728E-01 -6.2088E-01 -1.7174E+00 S13 -8.7790E+01 6.0623E-02 -5.7456E-01 2.7701E+00 -8.6457E+00 S14 -4.1125E+00 -1.3281E-01 2.3361E-01 -3.7968E-01 3.0408E-01 S15 9.9000E+01 -7.2772E-01 1.2123E+00 -2.1907E+00 3.7871E+00 S16 -1.0148E+01 -2.9875E-01 4.3348E-01 -4.9573E-01 4.1013E-01 Face number A12 A14 A16 A18 A20 S1 1.2421E-02 -2.7718E-03 3.9593E-04 -3.2563E-05 1.1697E-06 S2 1.4646E+01 -1.6137E+01 1.1115E+01 -4.3121E+00 7.1411E-01 S3 6.5876E+00 -6.9998E+00 4.7277E+00 -1.8275E+00 3.0694E-01 S4 -2.2842E-11 -1.6572E-12 -9.3482E-14 -5.2994E-15 -3.0023E-16 S5 -2.8784E-11 -1.6376E-12 -9.3278E-14 -5.2994E-15 -3.0023E-16 S6 9.2733E+02 -2.5709E+03 4.5916E+03 -4.7747E+03 2.2002E+03 S7 7.7950E+02 -1.8889E+03 2.8774E+03 -2.4853E+03 9.2750E+02 S8 -1.7133E-11 -1.6373E-12 -9.3278E-14 -5.2994E-15 -3.0023E-16 S9 -1.6906E-11 -1.6376E-12 -9.3278E-14 -5.2994E-15 -3.0023E-16 S10 -5.8441E+01 1.2808E+02 -2.0318E+02 1.9742E+02 -8.5662E+01 S11 7.5831E+00 -2.4323E+01 2.6563E+01 -9.3655E+00 -2.2018E+00 S12 7.5752E+00 -1.1277E+01 7.8539E+00 -2.3821E+00 1.7719E-01 S13 1.5965E+01 -1.7140E+01 1.0542E+01 -3.4507E+00 4.6667E-01 S14 -2.7497E-01 2.5653E-01 -8.6789E-02 -1.0956E-02 6.8855E-03 S15 -5.8562E+00 6.4999E+00 -4.3863E+00 1.5981E+00 -2.4217E-01 S16 -2.4579E-01 1.0729E-01 -3.2383E-02 5.9474E-03 -4.9247E-04

[0187] Depend on Figure 12 As can be seen from the various aberration diagrams, the longitudinal spherical aberration, astigmatism, and distortion of the optical system 10 are well controlled, and the optical system 10 of this embodiment can have good imaging quality.

[0188] Please refer to Table 13, which summarizes the ratios of the relationships in the first to fifth embodiments of this application.

[0189] Table 13

[0190]

[0191] Compared to conventional optical systems, the optical systems 10 in the above embodiments are able to maintain good imaging quality while compressing the overall length to achieve a miniaturized design.

[0192] refer to Figure 13This application also provides a camera module 20, which includes an optical system 10 and a photosensitive chip 210. The photosensitive chip 210 is disposed on the image side of the optical system 10, and the two can be fixed by a bracket. The photosensitive chip 210 can be a CCD sensor (Charge Coupled Device) or a CMOS sensor (Complementary Metal Oxide Semiconductor). Generally, during assembly, the imaging surface S17 of the optical system 10 overlaps with the photosensitive surface of the photosensitive chip 210. By employing the above-described optical system 10, the camera module 20 can maintain a wide-angle design while possessing good image quality.

[0193] refer to Figure 14 Some embodiments of this application also provide a terminal device 30. The terminal device 30 includes a fixing member, on which a camera module is mounted. The fixing member can be a display screen, circuit board, mid-frame, back cover, or other components. The terminal device 30 can be, but is not limited to, a smartphone, smartwatch, smart glasses, e-book reader, tablet computer, PDA (Personal Digital Assistant), vehicle camera, electronic rearview mirror, etc. The aforementioned camera module 20 can provide good image quality for the terminal device 30 while having a wide field of view.

[0194] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0195] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a communication connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances. In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that the specific features, structures, materials, or characteristics described in connection with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any suitable manner in one or more embodiments or examples. Furthermore, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0196] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An optical system, characterized in that, There are a total of eight refractive lenses, arranged sequentially from the object side to the image side along the optical axis: The first lens with negative refractive power has an object-side surface that is concave near the optical axis and an image-side surface that is concave near the optical axis. The second lens with refractive power has an object-side surface that is convex near the optical axis and an image-side surface that is concave near the optical axis. A third lens with refractive power; The fourth lens with positive refractive power has an object-side surface that is convex near the optical axis and an image-side surface that is convex near the optical axis. The fifth lens, which has refractive power, has an object-side surface that is concave near the optical axis and an image-side surface that is convex near the optical axis. The sixth lens with negative refractive power has an object-side surface that is convex near the optical axis and an image-side surface that is concave near the optical axis. The seventh lens with positive refractive power has an object-side surface that is convex near the optical axis and an image-side surface that is convex near the optical axis. The eighth lens with negative refractive power has an object-side surface that is concave near the optical axis and an image-side surface that is concave near the optical axis. The optical system satisfies the following relationship: -11<(R11+R21) / f1<0; 0.5<SAG12 / AT12<1.1; R11 is the radius of curvature of the object side of the first lens at the optical axis, R21 is the radius of curvature of the image side of the first lens at the optical axis, f1 is the effective focal length of the first lens, SAG12 is the sag of the image side of the first lens at the maximum effective aperture, and AT12 is the distance on the optical axis from the image side of the first lens to the object side of the second lens.

2. The optical system according to claim 1, characterized in that, The optical system satisfies the following relationship: -0.1<(|R51|-|R52|) / (|R51|+|R52|)<0.8; R51 is the radius of curvature of the object side of the fifth lens at the optical axis, and R52 is the radius of curvature of the image side of the fifth lens at the optical axis.

3. The optical system according to claim 1, characterized in that, The optical system satisfies the following relationship: 1 < ∑ET / ∑CT < 1.2; ∑ET is the sum of the edge thicknesses at the maximum effective aperture of the first lens to the eighth lens, and ∑CT is the sum of the thicknesses of the first lens to the eighth lens along the optical axis.

4. The optical system according to claim 1, characterized in that, The optical system satisfies the following relationship: 1.0 < (SD71 + SD81) / Imgh < 1.2, and / or, -1.22 ≤ f7 / f8 < -1; SD71 is the maximum effective half-aperture of the object side of the seventh lens, SD81 is the maximum effective half-aperture of the object side of the eighth lens, Imgh is half the image height corresponding to the maximum field of view of the optical system, f7 is the optically effective focal length of the seventh lens, and f8 is the optically effective focal length of the eighth lens.

5. The optical system according to claim 1, characterized in that, The optical system satisfies the following relationship: 1.4 < (ΣCT*EPD) / f < 1.8; ∑CT is the sum of the thicknesses of the first lens to the eighth lens along the optical axis; EPD is the entrance pupil diameter of the optical system; f is the effective focal length of the optical system.

6. The optical system according to claim 1, characterized in that, The optical system satisfies the following relationship: 0.63≤SAG12 / AT12<1.

1.

7. The optical system according to claim 1, characterized in that, The optical system satisfies the following relationship: 0.7 mm / rad < SD11 / RAD(FOV) < 1.0 mm / rad, and / or, 0.3 rad / mm < RAD(FOV) / TTL < 0.45 rad / mm, and / or, 1 rad < RAD(FOV) / FNO < 1.2 rad, and / or, 1.5 rad / mm < RAD(FOV) / f < 1.7 rad / mm; SD11 is the maximum effective half-aperture of the first lens object side, RAD(FOV) is the radian value corresponding to the maximum field of view of the optical system, TTL is the distance on the optical axis from the first lens object side to the imaging surface of the optical system, FNO is the aperture number of the optical system, and f is the effective focal length of the optical system.

8. The optical system according to claim 1, characterized in that, The optical system satisfies the following relationship: 2mm < TTL / FNO < 3mm, and / or, 3 < TTL / f < 4; and / or, 135° < FOV < 150°; TTL is the distance on the optical axis from the side of the first lens to the imaging surface of the optical system, FNO is the aperture number of the optical system, f is the effective focal length of the optical system, and FOV is the maximum field of view of the optical system.

9. The optical system according to claim 1, characterized in that, The optical system satisfies the following relationship: -11<(R11+R21) / f1≤-0.

74.

10. A camera module, characterized in that, The system includes a photosensitive chip and an optical system according to any one of claims 1 to 9, wherein the photosensitive chip is disposed on the image side of the optical system.

11. A terminal device, characterized in that, It includes a fixing member and the camera module as described in claim 10, wherein the camera module is disposed on the fixing member.

Images