Camera lens group

Abstract

The present invention relates to a camera lens group. Among them, the lens group includes, successively arranged from the object side to the image side along the optical axis: a first lens with a convex object side; a second lens with a convex image side and having optical power; a third lens with a convex image side and having positive optical power; a fourth lens with negative optical power; a fifth lens with a convex image side; a sixth lens with optical power; wherein, the maximum field of view FOV of the camera lens group and the distance TTL on the optical axis from the object side of the first lens to the imaging surface of the camera lens group satisfy: 5×tan(FOV - 90°) / TTL > 0.8 mm-1. The camera lens group adopting this structure can achieve clear imaging in a large range, and has the characteristics of ultra-thin and miniaturization, and can have important applications in the fields of vehicle-mounted, security monitoring, etc.

Description

Technical Field

[0001] The present invention relates to the field of optical imaging, and particularly to a camera lens, specifically a camera lens group composed of six lenses. Background Art

[0002] With the development of optical lens technology, due to the limitation of the lens field of view angle of conventional wide-angle lenses, there will be monitoring blind spots when applied to security and vehicle-mounted systems. The field of view angle of existing vehicle-mounted lenses is generally about 70° - 90°, while that of security monitoring lenses is generally about 90° - 120°. For a generally larger monitoring area, several camera lenses need to be installed to achieve larger area monitoring, which undoubtedly increases the cost of the lenses and the installation cost, and also increases the cost of backend display processing and storage. Summary of the Invention

[0003] The present invention aims to provide a camera lens group composed of six lenses, which is a lens group with a large field of view, a large monitoring range, high resolution, and clear imaging, meeting the market demands in the fields of vehicle-mounted and security monitoring.

[0004] One aspect of the present invention provides a camera lens group, which includes, arranged in sequence from the object side to the image side along the optical axis:

[0005] A first lens with a focal power, whose object side surface is convex;

[0006] A second lens with a focal power, whose image side surface is convex;

[0007] A third lens with a positive focal power, whose image side surface is convex;

[0008] A fourth lens with a negative focal power;

[0009] A fifth lens with a focal power, whose image side surface is convex;

[0010] A sixth lens with a focal power;

[0011] Wherein, the maximum field of view angle FOV of the camera lens group and the distance TTL on the optical axis from the object side surface of the first lens to the imaging surface of the camera lens group satisfy: 5×tan(FOV - 90°) / TTL > 0.8 (mm -1 )

[0012] According to an embodiment of the present invention, the effective focal length f3 of the third lens and the effective focal length f of the camera lens group satisfy: 1 < f3 / f < 3.

[0013] According to an embodiment of the present invention, the radius of curvature R1 of the object side surface of the first lens and the radius of curvature R10 of the image side surface of the fifth lens satisfy: -15 < R1 / R10 < -4.

[0014] According to an embodiment of the present invention, the distance T45 between the fourth lens and the fifth lens on the optical axis and the distance T56 between the fifth lens and the sixth lens on the optical axis satisfy: T45 / T56 < 0.5.

[0015] According to an embodiment of the present invention, the distance T56 between the fifth lens and the sixth lens on the optical axis and the distance BFL from the image side surface of the sixth lens to the imaging surface of the camera lens group on the optical axis satisfy: 0.3 < T56 / BFL < 1.1.

[0016] According to an embodiment of the present invention, the central thickness CT2 of the second lens and the central thickness CT3 of the third lens satisfy: CT2 / CT3 > 1.3.

[0017] According to an embodiment of the present invention, the distance T23 between the second lens and the third lens on the optical axis and the distance T12 between the first lens and the second lens on the optical axis satisfy: T23 / T12 < 1.4.

[0018] According to an embodiment of the present invention, the distance T23 between the second lens and the third lens on the optical axis, the distance T34 between the third lens and the fourth lens on the optical axis, the distance T45 between the fourth lens and the fifth lens on the optical axis, and the distance Tr3r8 from the object side surface of the second lens to the image side surface of the fourth lens on the optical axis satisfy: 0.2452 / 1.9414 ≤ (T23 + T34 + T45) / Tr3r8 ≤ 0.3414 / 2.1130.

[0019] According to an embodiment of the present invention, the maximum effective radius DT11 of the object side surface of the first lens and the distance TTL from the object side surface of the first lens to the imaging surface of the camera lens group on the optical axis satisfy: 0.4 < DT11 / TTL < 0.8.

[0020] According to an embodiment of the present invention, the maximum effective radius DT11 of the object side surface of the first lens and the maximum effective radius DT62 of the image side surface of the sixth lens satisfy: 2 < DT11 / DT62 < 5.

[0021] According to an embodiment of the present invention, the maximum effective radius DT11 of the object side of the first lens and half of the diagonal length ImgH of the effective pixel region on the imaging surface satisfy: 1.5 < DT11 / ImgH < 3.

[0022] According to an embodiment of the present invention, the edge thickness ET2 of the second lens at the maximum effective diameter and the central thickness CT2 of the second lens satisfy: 0.9 < ET2 / CT2 < 1.2.

[0023] According to an embodiment of the present invention, the distance SAG61 between the intersection point of the object side of the sixth lens and the optical axis and the vertex of the effective radius of the object side of the sixth lens on the optical axis and the central thickness CT6 of the sixth lens satisfy: -2 < SAG61 / CT6 < -1.

[0024] According to an embodiment of the present invention, the distance SAG51 between the intersection point of the object side of the fifth lens and the optical axis and the vertex of the effective radius of the object side of the fifth lens on the optical axis and the distance SAG52 between the intersection point of the image side of the fifth lens and the optical axis and the vertex of the effective radius of the image side of the fifth lens on the optical axis satisfy: -0.6 < SAG51 / SAG52 < 0.

[0025] According to an embodiment of the present invention, the distance SAG41 between the intersection point of the object side of the fourth lens and the optical axis and the vertex of the effective radius of the object side of the fourth lens on the optical axis and the distance SAG42 between the intersection point of the image side of the fourth lens and the optical axis and the vertex of the effective radius of the image side of the fourth lens on the optical axis satisfy: |SAG41 / SAG42| < 0.3.

[0026] According to an embodiment of the present invention, the maximum effective radius DT12 of the image side of the first lens and the distance SAG12 between the intersection point of the image side of the first lens and the optical axis and the vertex of the effective radius of the image side of the first lens on the optical axis satisfy: 0.7 < DT12 / SAG12 < 1.2.

[0027] According to an embodiment of the present invention, the distance SAG52 between the intersection point of the image side of the fifth lens and the optical axis and the vertex of the effective radius of the image side of the fifth lens on the optical axis and the distance SAG61 between the intersection point of the object side of the sixth lens and the optical axis and the vertex of the effective radius of the object side of the sixth lens on the optical axis satisfy: 0.3 < SAG52 / SAG61 < 1.

[0028] According to an embodiment of the present invention, the maximum effective radius DT31 of the object side surface of the third lens and the maximum effective radius DT52 of the image side surface of the fifth lens satisfy: 0.3 < DT31 / DT52 < 0.8.

[0029] According to an embodiment of the present invention, the distance SAG21 on the optical axis between the intersection point of the object side surface of the second lens and the optical axis and the vertex of the effective radius of the object side surface of the second lens and the central thickness CT2 of the second lens satisfy: -0.3 < SAG21 / CT2 < 0.

[0030] According to an embodiment of the present invention, the distance SAG11 on the optical axis between the intersection point of the object side surface of the first lens and the optical axis and the vertex of the effective radius of the object side surface of the first lens and the central thickness CT1 of the first lens satisfy: 0 ≤ (SAG11 - CT1) / CT1 < 1.

[0031] According to an embodiment of the present invention, the maximum effective radius DT62 of the image side surface of the sixth lens, the maximum effective radius DT61 of the object side surface of the sixth lens, and the maximum effective radius DT52 of the image side surface of the fifth lens satisfy: 2 < (DT62 - DT61) / (DT61 - DT52) < 4.

[0032] Another aspect of the present invention provides a camera lens group, which includes, arranged in sequence from the object side to the image side along the optical axis:

[0033] A first lens having a focal power, the object side surface of which is convex;

[0034] A second lens having a focal power, the image side surface of which is convex;

[0035] A third lens having a positive focal power, the image side surface of which is convex;

[0036] A fourth lens having a negative focal power;

[0037] A fifth lens having a focal power, the image side surface of which is convex;

[0038] A sixth lens having a focal power;

[0039] Wherein, the maximum effective radius DT11 of the object side surface of the first lens and the maximum effective radius DT12 of the image side surface of the first lens satisfy: 1.5 < (DT11 - DT12) / DT12 < 3.

[0040] According to an embodiment of the present invention, the effective focal length f3 of the third lens and the effective focal length f of the camera lens group satisfy: 1 < f3 / f < 3.

[0041] According to an embodiment of the present invention, the radius of curvature R1 of the object side surface of the first lens and the radius of curvature R10 of the image side surface of the fifth lens satisfy: -15 < R1 / R10 < -4.

[0042] According to an embodiment of the present invention, the distance T45 between the fourth lens and the fifth lens on the optical axis and the distance T56 between the fifth lens and the sixth lens on the optical axis satisfy: T45 / T56 < 0.5.

[0043] According to an embodiment of the present invention, the distance T56 between the fifth lens and the sixth lens on the optical axis and the distance BFL from the image side surface of the sixth lens to the imaging surface of the camera lens group on the optical axis satisfy: 0.3 < T56 / BFL < 1.1.

[0044] According to an embodiment of the present invention, the central thickness CT2 of the second lens and the central thickness CT3 of the third lens satisfy: CT2 / CT3 > 1.3.

[0045] According to an embodiment of the present invention, the distance T23 between the second lens and the third lens on the optical axis and the distance T12 between the first lens and the second lens on the optical axis satisfy: T23 / T12 < 1.4.

[0046] According to an embodiment of the present invention, the distance T23 between the second lens and the third lens on the optical axis, the distance T34 between the third lens and the fourth lens on the optical axis, the distance T45 between the fourth lens and the fifth lens on the optical axis, and the distance Tr3r8 from the object side surface of the second lens to the image side surface of the fourth lens on the optical axis satisfy: 0.2452 / 1.9414 ≤ (T23 + T34 + T45) / Tr3r8 ≤ 0.3414 / 2.1130.

[0047] According to an embodiment of the present invention, the maximum effective radius DT11 of the object side surface of the first lens and the distance TTL from the object side surface of the first lens to the imaging surface of the camera lens group on the optical axis satisfy: 0.4 < DT11 / TTL < 0.8.

[0048] According to an embodiment of the present invention, the maximum effective radius DT11 of the object side surface of the first lens and the maximum effective radius DT62 of the image side surface of the sixth lens satisfy: 2 < DT11 / DT62 < 5.

[0049] According to an embodiment of the present invention, the maximum effective radius DT11 of the object side of the first lens and half of the diagonal length ImgH of the effective pixel region on the imaging surface satisfy: 1.5 < DT11 / ImgH < 3.

[0050] According to an embodiment of the present invention, the edge thickness ET2 of the second lens at the maximum effective diameter and the central thickness CT2 of the second lens satisfy: 0.9 < ET2 / CT2 < 1.2.

[0051] According to an embodiment of the present invention, the distance SAG61 between the intersection point of the object side of the sixth lens and the optical axis and the vertex of the effective radius of the object side of the sixth lens on the optical axis and the central thickness CT6 of the sixth lens satisfy: -2 < SAG61 / CT6 < -1.

[0052] According to an embodiment of the present invention, the distance SAG51 between the intersection point of the object side of the fifth lens and the optical axis and the vertex of the effective radius of the object side of the fifth lens on the optical axis and the distance SAG52 between the intersection point of the image side of the fifth lens and the optical axis and the vertex of the effective radius of the image side of the fifth lens on the optical axis satisfy: -0.6 < SAG51 / SAG52 < 0.

[0053] According to an embodiment of the present invention, the distance SAG41 between the intersection point of the object side of the fourth lens and the optical axis and the vertex of the effective radius of the object side of the fourth lens on the optical axis and the distance SAG42 between the intersection point of the image side of the fourth lens and the optical axis and the vertex of the effective radius of the image side of the fourth lens on the optical axis satisfy: |SAG41 / SAG42| < 0.3.

[0054] According to an embodiment of the present invention, the maximum effective radius DT12 of the image side of the first lens and the distance SAG12 between the intersection point of the image side of the first lens and the optical axis and the vertex of the effective radius of the image side of the first lens on the optical axis satisfy: 0.7 < DT12 / SAG12 < 1.2.

[0055] According to an embodiment of the present invention, the distance SAG52 between the intersection point of the image side of the fifth lens and the optical axis and the vertex of the effective radius of the image side of the fifth lens on the optical axis and the distance SAG61 between the intersection point of the object side of the sixth lens and the optical axis and the vertex of the effective radius of the object side of the sixth lens on the optical axis satisfy: 0.3 < SAG52 / SAG61 < 1.

[0056] According to an embodiment of the present invention, the maximum effective radius DT31 of the object side surface of the third lens and the maximum effective radius DT52 of the image side surface of the fifth lens satisfy: 0.3 < DT31 / DT52 < 0.8.

[0057] According to an embodiment of the present invention, the distance SAG21 on the optical axis between the intersection point of the object side surface of the second lens and the optical axis and the vertex of the effective radius of the object side surface of the second lens and the central thickness CT2 of the second lens satisfy: -0.3 < SAG21 / CT2 < 0.

[0058] According to an embodiment of the present invention, the distance SAG11 on the optical axis between the intersection point of the object side surface of the first lens and the optical axis and the vertex of the effective radius of the object side surface of the first lens and the central thickness CT1 of the first lens satisfy: 0 ≤ (SAG11 - CT1) / CT1 < 1.

[0059] According to an embodiment of the present invention, the maximum effective radius DT62 of the image side surface of the sixth lens, the maximum effective radius DT61 of the object side surface of the sixth lens, and the maximum effective radius DT52 of the image side surface of the fifth lens satisfy: 2 < (DT62 - DT61) / (DT61 - DT52) < 4.

[0060] Advantages of the present invention:

[0061] The camera lens group provided by the present invention includes multiple lenses, such as the first lens to the sixth lens. It has a large field of view and can be used as a fish-eye lens. Although the object-image difference is large due to the large distortion in the camera lens group with this structure, it does not affect the resolution at all, and can ensure the one-to-one correspondence between the object point and the image point, and can achieve clear imaging in a large range. At the same time, the camera lens with the above structure has the characteristics of ultra-thin and miniaturization, and has important applications in fields such as vehicle-mounted and security monitoring. Description of the drawings

[0062] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0063] Figure 1 It is a schematic diagram of the lens group structure of Embodiment 1 of the camera lens group of the present invention;

[0064] Figures 1a to 1c They are respectively the axial chromatic aberration curve, astigmatism curve, and lateral chromatic aberration curve of Embodiment 1 of the camera lens group of the present invention;

[0065] Figure 2 Schematic diagram of the lens group structure of Embodiment 2 of the camera lens group of the present invention;

[0066] Figures 2a to 2c The axial chromatic aberration curve, astigmatism curve and lateral chromatic aberration curve of Embodiment 2 of the camera lens group of the present invention respectively;

[0067] Figure 3 Schematic diagram of the lens group structure of Embodiment 3 of the camera lens group of the present invention;

[0068] Figures 3a to 3c The axial chromatic aberration curve, astigmatism curve and lateral chromatic aberration curve of Embodiment 3 of the camera lens group of the present invention respectively;

[0069] Figure 4 Schematic diagram of the lens group structure of Embodiment 4 of the camera lens group of the present invention;

[0070] Figures 4a to 4c The axial chromatic aberration curve, astigmatism curve and lateral chromatic aberration curve of Embodiment 4 of the camera lens group of the present invention respectively;

[0071] Figure 5 Schematic diagram of the lens group structure of Embodiment 5 of the camera lens group of the present invention;

[0072] Figures 5a to 5c The axial chromatic aberration curve, astigmatism curve and lateral chromatic aberration curve of Embodiment 5 of the camera lens group of the present invention respectively;

[0073] Figure 6 Schematic diagram of the lens group structure of Embodiment 6 of the camera lens group of the present invention;

[0074] Figures 6a to 6c The axial chromatic aberration curve, astigmatism curve and lateral chromatic aberration curve of Embodiment 6 of the camera lens group of the present invention respectively;

[0075] Figure 7 Schematic diagram of the lens group structure of Embodiment 7 of the camera lens group of the present invention;

[0076] Figures 7a to 7c The axial chromatic aberration curve, astigmatism curve and lateral chromatic aberration curve of Embodiment 7 of the camera lens group of the present invention respectively. Detailed implementation manners

[0077] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0078] It should be noted that in this specification, the expressions such as first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the features. Therefore, without departing from the teachings of the present invention, the first lens discussed below may also be referred to as the second lens or the third lens.

[0079] It should also be understood that the terms "comprising", "comprising of", "having", "containing" and / or "containing of", when used in this specification, indicate the presence of the stated features, elements and / or components, but do not exclude the presence or addition of one or more other features, elements, components and / or combinations thereof. In addition, when an expression such as "at least one of......" appears after the list of listed features, it modifies the entire listed features, rather than individual elements in the list. In addition, when describing the embodiments of the present application, the use of "may" means "one or more embodiments of the present application". And the term "exemplary" is intended to refer to an example or illustration.

[0080] In the drawings, for the sake of convenience of explanation, the thickness, size and shape of the lens have been slightly exaggerated. Specifically, the spherical or aspherical shapes shown in the drawings are shown by way of example. That is, the spherical or aspherical shapes are not limited to the spherical or aspherical shapes shown in the drawings. The drawings are only examples and are not drawn to an exact scale.

[0081] In the description of the present invention, the paraxial region refers to the region near the optical axis. If the lens surface is convex and the position of the convex surface is not defined, it means that the lens surface is convex at least in the paraxial region. If the lens surface is concave and the position of the concave surface is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object to be photographed is called the object side surface of the lens, and the surface of each lens closest to the imaging surface is called the image side surface of the lens.

[0082] Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It should also be understood that terms (such as those defined in a common dictionary) should be interpreted as having a meaning consistent with their meaning in the context of the relevant art, and will not be interpreted in an idealized or overly formal manner unless expressly so defined herein.

[0083] It should be noted that, without conflict, the embodiments and features in the embodiments of the present invention can be combined with each other. The features, principles and other aspects of the present invention will be described in detail below with reference to the drawings and in combination with the embodiments.

[0084] Exemplary Embodiments

[0085] The camera lens group of the exemplary embodiment of the present invention includes six lenses, which sequentially include, from the object side to the image side along the optical axis: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens. Among them, each lens is independent of each other, and there is an air gap between each lens on the optical axis.

[0086] In this exemplary embodiment, the first lens has a focal power, and its object side surface is convex; the second lens has a focal power, and its image side surface is convex; the third lens has a positive focal power, and its image side surface is convex; the fourth lens has a negative focal power; the fifth lens has a focal power, and its image side surface is convex; the sixth lens has a focal power.

[0087] In this exemplary embodiment, the conditional formula satisfied by the maximum field of view angle FOV of the camera lens group and the distance TTL on the optical axis from the object side surface of the first lens to the imaging surface of the camera lens group is: 5×tan(FOV - 90°) / TTL > 0.8 (mm -1 )). The designed camera lens group can compress the size of the optical system including the lens group to ensure the ultra-thin characteristics of the lens and meet the requirements of miniaturization of the imaging system. More specifically, FOV and TTL satisfy: 5×tan(FOV - 90°) / TTL > 1.30 (mm -1 ), for example, 5×tan(FOV - 90°) / TTL ≥ 1.53 (mm -1 ).

[0088] In this exemplary embodiment, the conditional formula satisfied by the effective focal length f3 of the third lens and the effective focal length f of the camera lens group is: 1 < f3 / f < 3. By constraining the ratio of the effective focal length of the third lens to that of the camera lens group, the field curvature of the system can be reasonably controlled within a certain range. More specifically, f3 and f satisfy: 1.10 < f3 / f < 2.5, for example, 1.15 ≤ f3 / f ≤ 1.42.

[0089] In this exemplary embodiment, the conditional formula satisfied by the curvature radius R1 of the object side surface of the first lens and the curvature radius R10 of the image side surface of the fifth lens is: -15 < R1 / R10 < -4. By controlling the ratio of the curvature radius of the object side surface of the first lens to the curvature radius of the image side surface of the fifth lens within a certain range, the deflection angle of the marginal rays of the system including the camera lens group can be reasonably controlled, and the sensitivity of the system can be effectively reduced. More specifically, R1 and R10 satisfy: -13 < R1 / R10 < -5, for example, -10 ≤ R1 / R10 ≤ -5.24.

[0090] In the present exemplary embodiment, the conditional formula satisfied by the distance T45 between the fourth lens and the fifth lens on the optical axis and the distance T56 between the fifth lens and the sixth lens on the optical axis is: T45 / T56 < 0.5. By restricting the ratio of the air space between the fourth lens and the fifth lens to the air space between the fifth lens and the sixth lens, the field curvature contribution of each field of view can be controlled within a reasonable range. More specifically, T45 and T56 satisfy: T45 / T56 < 0.4, for example, T45 / T56 ≤ 0.14.

[0091] In the present exemplary embodiment, the conditional formula satisfied by the distance T56 between the fifth lens and the sixth lens on the optical axis and the distance BFL from the image side surface of the sixth lens to the imaging surface of the camera lens group on the optical axis is: 0.3 < T56 / BFL < 1.1. By restricting the ratio of the air space between the fifth lens and the sixth lens to the axial distance from the image side surface of the sixth lens to the imaging surface of the camera lens group, the manifestation of coma of the system including the camera lens group can be reasonably controlled, enabling the optical system to have good optical performance. More specifically, T56 and BFL satisfy: 0.35 < T56 / BFL < 1.08, for example, 0.41 ≤ T56 / BFL ≤ 1.07.

[0092] In the present exemplary embodiment, the conditional formula satisfied by the central thickness CT2 of the second lens and the central thickness CT3 of the third lens is: CT2 / CT3 > 1.3. By controlling the ratio of the central thicknesses of the second lens and the third lens, the amount of distortion of the system can be reasonably regulated, ultimately keeping the distortion of the system within a certain range. More specifically, CT2 and CT3 satisfy: CT2 / CT3 > 3.0, for example, CT2 / CT3 ≥ 3.54.

[0093] In the present exemplary embodiment, the conditional formula satisfied by the distance T23 between the second lens and the third lens on the optical axis and the distance T12 between the first lens and the second lens on the optical axis is: T23 / T12 < 1.4. By reasonably controlling the ratio of the air space between the second lens and the third lens to the air space between the first lens and the second lens, the field curvature of the system can be effectively guaranteed, thereby enabling the off-axis fields of the system to obtain good imaging quality. More specifically, T23 and T12 satisfy: T23 / T12 < 0.46, for example, T23 / T12 ≤ 0.43.

[0094] In the present exemplary embodiment, the condition formula satisfied by the distance T23 between the second lens and the third lens on the optical axis, the distance T34 between the third lens and the fourth lens on the optical axis, the distance T45 between the fourth lens and the fifth lens on the optical axis, and the distance Tr3r8 between the object side surface of the second lens and the image side surface of the fourth lens on the optical axis is: 0.2452 / 1.9414 ≤ (T23 + T34 + T45) / Tr3r8 ≤ 0.3414 / 2.1130. By reasonably controlling the ratio of the sum of the air spaces between the second lens and the third lens, the third lens and the fourth lens, and the fourth lens and the fifth lens to the air space between the object side surface of the second lens and the image side surface of the fourth lens, the field curvature of the system can be effectively ensured, so that a good imaging quality can be obtained for the off-axis field of view of the system including the camera lens group.

[0095] In the present exemplary embodiment, the condition formula satisfied by the maximum effective radius DT11 of the object side surface of the first lens and the distance TTL between the object side surface of the first lens and the imaging surface of the camera lens group on the optical axis is: 0.4 < DT11 / TTL < 0.8. By restricting the ratio of the maximum effective radius of the object side surface of the first lens to the on-axis distance between the object side surface of the first lens and the imaging surface of the camera lens group within a certain range, the characteristics of ultra-thin and miniaturized lenses can be achieved. More specifically, DT11 and TTL satisfy: 0.45 < DT11 / TTL < 0.75. For example, 0.50 ≤ DT11 / TTL ≤ 0.70.

[0096] In the present exemplary embodiment, the condition formula satisfied by the maximum effective radius DT11 of the object side surface of the first lens and the maximum effective radius DT62 of the image side surface of the sixth lens is: 2 < DT11 / DT62 < 5. This design is beneficial to balancing the realization of miniaturization of the module and good imaging quality for wide angles. More specifically, DT11 and DT62 satisfy: 2.50 < DT11 / DT62 < 4.60. For example, 2.27 ≤ DT11 / DT62 ≤ 4.37.

[0097] In the present exemplary embodiment, the condition formula satisfied by the maximum effective radius DT11 of the object side surface of the first lens and half of the diagonal length ImgH of the effective pixel region on the imaging surface is: 1.5 < DT11 / ImgH < 3. This design is beneficial to balancing the realization of miniaturization of the module and good imaging quality for wide angles. More specifically, DT11 and ImgH satisfy: 1.55 < DT11 / ImgH < 2.85. For example, 1.63 ≤ DT11 / ImgH ≤ 2.79.

[0098] In this exemplary embodiment, the conditional formula satisfied by the edge thickness ET2 of the second lens at the maximum effective diameter and the central thickness CT2 of the second lens is: 0.9 < ET2 / CT2 < 1.2. This design improves the strength of the second lens and ensures that the lens has good processability, thus ensuring a certain molding yield of the lens, which in turn can contribute to the production and processing yield of the overall lens and improve production efficiency. More specifically, ET2 and CT2 satisfy: 0.95 < ET2 / CT2 < 1.15. For example, 1.01 ≤ ET2 / CT2 ≤ 1.07.

[0099] In this exemplary embodiment, the conditional formula satisfied by the distance SAG61 between the intersection point of the object side surface of the sixth lens and the optical axis and the vertex of the effective radius of the object side surface of the sixth lens on the optical axis and the central thickness CT6 of the sixth lens is: -2 < SAG61 / CT6 < -1. The above design can effectively reduce the incident angle of the chief ray on the object side surface of the sixth lens and improve the matching degree between the camera lens group and the chip in the camera system. More specifically, SAG61 and CT6 satisfy: -1.90 < SAG61 / CT6 < -1.20. For example, -1.70 ≤ SAG61 / CT6 ≤ -1.43.

[0100] In this exemplary embodiment, the conditional formula satisfied by the distance SAG51 between the intersection point of the object side surface of the fifth lens and the optical axis and the vertex of the effective radius of the object side surface of the fifth lens on the optical axis and the distance SAG52 between the intersection point of the image side surface of the fifth lens and the optical axis and the vertex of the effective radius of the image side surface of the fifth lens on the optical axis is: -0.6 < SAG51 / SAG52 < 0. The above design can effectively control the central thickness of the fifth lens and improve the plasticity of the lens. More specifically, SAG51 and SAG52 satisfy: -0.5 < SAG51 / SAG52 < -0.10. For example, -0.33 ≤ SAG51 / SAG52 ≤ -0.23.

[0101] In this exemplary embodiment, the conditional formula satisfied by the distance SAG41 between the intersection point of the object side surface of the fourth lens and the optical axis and the vertex of the effective radius of the object side surface of the fourth lens on the optical axis and the distance SAG42 between the intersection point of the image side surface of the fourth lens and the optical axis and the vertex of the effective radius of the image side surface of the fourth lens on the optical axis is: |SAG41 / SAG42| < 0.3. The above design can effectively control the central thickness of the fourth lens and improve the plasticity of the lens. More specifically, SAG41 and SAG42 satisfy: |SAG41 / SAG42| < 0.20. For example, |SAG41 / SAG42| ≤ 0.09.

[0102] In this exemplary embodiment, the conditional formula satisfied by the maximum effective radius DT12 of the image side of the first lens and the distance SAG12 on the optical axis between the intersection point of the image side of the first lens and the optical axis and the vertex of the effective radius of the image side of the first lens is: 0.7 < DT12 / SAG12 < 1.2. The above design can ensure that light with a sufficient field of view enters the optical system. More specifically, DT12 and SAG12 satisfy: 0.75 < DT12 / SAG12 < 1.16. For example, 0.85 ≤ DT12 / SAG12 ≤ 1.11.

[0103] In this exemplary embodiment, the conditional formula satisfied by the distance SAG52 on the optical axis between the intersection point of the image side of the fifth lens and the optical axis and the vertex of the effective radius of the image side of the fifth lens and the distance SAG61 on the optical axis between the intersection point of the object side of the sixth lens and the optical axis and the vertex of the effective radius of the object side of the sixth lens is: 0.3 < SAG52 / SAG61 < 1. The above design can effectively control the center thickness of the fifth lens and improve the plasticity of the lens. More specifically, SAG52 and SAG61 satisfy: 0.35 < SAG52 / SAG61 < 0.90. For example, 0.44 ≤ SAG52 / SAG61 ≤ 0.85.

[0104] In this exemplary embodiment, the conditional formula satisfied by the maximum effective radius DT31 of the object side of the third lens and the maximum effective radius DT52 of the image side of the fifth lens is: 0.3 < DT31 / DT52 < 0.8. The above design is beneficial to improving the processing manufacturability of the third lens and the fifth lens and reducing the forming manufacturing difficulty. More specifically, DT31 and DT52 satisfy: 0.4 < DT31 / DT52 < 0.7. For example, 0.50 ≤ DT31 / DT52 ≤ 0.64.

[0105] In this exemplary embodiment, the conditional formula satisfied by the distance SAG21 on the optical axis between the intersection point of the object side of the second lens and the optical axis and the vertex of the effective radius of the object side of the second lens and the center thickness CT2 of the second lens is: -0.3 < SAG21 / CT2 < 0. The above design is beneficial to reducing the incident angle of the chief ray on the object side of the second lens and reducing the decentration sensitivity of the second lens. More specifically, SAG21 and CT2 satisfy: -0.20 < SAG21 / CT2 < -0.05. For example, -0.14 ≤ SAG21 / CT2 ≤ -0.03.

[0106] In this exemplary embodiment, the condition equation satisfied by the distance SAG11 on the optical axis between the intersection point of the object side surface of the first lens and the optical axis and the vertex of the effective radius of the object side surface of the first lens and the center thickness CT1 of the first lens is: 0 ≤ (SAG11 - CT1) / CT1 < 1. The above design ensures that the lens group has a sufficient field of view and improves the strength of the first lens. More specifically, SAG11 and CT1 satisfy: 0.06 < (SAG11 - CT1) / CT1 < 0.95. For example, 0.08 ≤ (SAG11 - CT1) / CT1 ≤ 0.89.

[0107] In this exemplary embodiment, the condition equation satisfied by the maximum effective radius DT62 of the image side surface of the sixth lens, the maximum effective radius DT61 of the object side surface of the sixth lens, and the maximum effective radius DT52 of the image side surface of the fifth lens is: 2 < (DT62 - DT61) / (DT61 - DT52) < 4. The above design is beneficial to improving the processing manufacturability of the fifth and sixth lenses and reducing the forming manufacturing difficulty. More specifically, DT62, DT61, and DT52 satisfy: 2.20 < (DT62 - DT61) / (DT61 - DT52) < 3.70. For example, 2.30 < (DT62 - DT61) / (DT61 - DT52) < 3.58.

[0108] In this exemplary embodiment, the above camera lens group may further include a diaphragm. The diaphragm can be set at an appropriate position according to needs. For example, the diaphragm can be set between the second lens and the third lens. Optionally, the above camera lens group may further include a filter for correcting color deviation and / or a protective glass for protecting the photosensitive element located on the imaging surface.

[0109] The camera lens group according to the above embodiment of the present invention may employ multiple lenses, such as the six lenses described above. By reasonably distributing the optical power, surface shape, center thickness of each lens, and the axial spacing between each lens, etc., the camera lens group has a large imaging image plane, has the characteristics of a wide imaging range and high imaging quality, and ensures the ultra-thinness of the mobile phone.

[0110] In an exemplary embodiment, at least one of the lens surfaces of each lens is an aspherical lens surface, that is, at least one of the object-side surfaces of the first lens to the image-side surfaces of the sixth lens is an aspherical lens surface. The characteristics of an aspherical lens are as follows: from the center of the lens to the periphery of the lens, the curvature changes continuously. Different from a spherical lens with a constant curvature from the center of the lens to the periphery of the lens, an aspherical lens has better curvature radius characteristics and has the advantages of improving distortion aberration and astigmatism aberration. After using an aspherical lens, it is possible to eliminate as much as possible the aberration that appears during imaging, thereby improving the imaging quality. Optionally, at least one of the object-side surface and the image-side surface of each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens is an aspherical lens surface. Optionally, both the object-side surface and the image-side surface of each of the first lens, the second lens, the third lens, the fourth lens, the fifth lens, and the sixth lens are aspherical lens surfaces.

[0111] In another exemplary embodiment, the camera lens group also includes a first lens with a focal power arranged in sequence from the object side to the image side along the optical axis, whose object-side surface is convex; a second lens with a focal power, whose image-side surface is convex; a third lens with a positive focal power, whose image-side surface is convex; a fourth lens with a negative focal power; a fifth lens with a focal power, whose image-side surface is convex; and a sixth lens with a focal power. Different from the above exemplary embodiment, in this exemplary embodiment, the conditional formula satisfied by the maximum effective radius DT11 of the object-side surface of the first lens and the maximum effective radius DT12 of the image-side surface of the first lens is: 1.5 < (DT11 - DT12) / DT12 < 3. This design ensures that the lens group has a larger field of view angle and improves the strength of the first lens, while ensuring the high imaging quality of the camera lens group. More specifically, DT11 and DT12 satisfy: 1.60 < (DT11 - DT12) / DT12 < 2.80. For example, 1.73 ≤ (DT11 - DT12) / DT12 ≤ 2.65.

[0112] Other technical features of the camera lens group in this exemplary embodiment can also satisfy the conditional formula in the previous exemplary embodiment, so they will not be elaborated here.

[0113] However, those skilled in the art should understand that without departing from the technical solution claimed in this application, the number of lenses constituting the camera lens group can be changed to obtain the various results and advantages described in this specification. For example, although six lenses are described as an example in the embodiment, the camera lens group is not limited to including six lenses. If necessary, the camera lens group can also include other numbers of lenses.

[0114] Next, a specific embodiment of the camera lens group applicable to the above embodiments will be further described with reference to the accompanying drawings. Specific Embodiment 1

[0116] Figure 1 This is a schematic diagram of the lens group structure of Embodiment 1 of the camera lens group of the present invention. The camera lens group includes, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a diaphragm STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an imaging surface S15. Among them:

[0117] The first lens E1 has a negative optical power. Its object side surface S1 is convex, and its image side surface S2 is concave; the second lens E2 has a positive optical power. Its object side surface S3 is concave, and its image side surface S4 is convex; the third lens E3 has a positive optical power. Its object side surface S5 is convex, and its image side surface S6 is convex; the fourth lens E4 has a negative optical power. Its object side surface S7 is convex, and its image side surface S8 is concave; the fifth lens E5 has a positive optical power. Its object side surface S9 is convex, and its image side surface S10 is convex; the sixth lens E6 has a negative optical power. Its object side surface S11 is convex, and its image side surface S12 is concave; the filter E7 has an object side surface S13 and an image side surface S14. Light from the object sequentially passes through the surfaces of S1 to S14 and finally forms an image on the imaging surface S15.

[0118] As shown in Table 1, it is the basic parameter table of the camera lens group of Embodiment 1. Among them, the unit of the radius of curvature, focal length, and thickness / distance is millimeter (mm):

[0119]

[0120] Table 1

[0121] As shown in Table 2, in Embodiment 1, the distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S15 on the optical axis is 6.56 mm, half of the diagonal length of the effective pixel area on the imaging surface S15 is ImgH = 1.88 mm, the maximum field of view angle FOV of the optical imaging system is 204.0°, the aperture value Fno of the camera lens group is 2.62, and the total effective focal length f of the camera lens group is 1.25 mm. The parameters of each relationship are as explained in the exemplary embodiment, and the values of each relationship are listed in the following table:

[0122]

[0123] Table 2

[0124] The camera lens group in Embodiment 1 satisfies:

[0125] 5×tan(FOV - 90°) / TTL = 1.17 (mm -1), where FOV is the maximum field of view angle of the camera lens group, and TTL is the on-axis distance from the object side surface of the first lens to the imaging surface of the camera lens group;

[0126] (DT11 - DT12) / DT12 = 1.74, where DT11 is the maximum effective radius of the object side surface of the first lens, and DT12 is the maximum effective radius of the image side surface of the first lens;

[0127] f3 / f = 1.17, where f3 is the effective focal length of the third lens, and f is the effective focal length of the camera lens group;

[0128] R1 / R10 = -5.30, where R1 is the curvature radius of the object side surface of the first lens, and R10 is the curvature radius of the image side surface of the fifth lens;

[0129] T45 / T56 = 0.32, where T45 is the on-axis distance from the fourth lens to the fifth lens, and T56 is the on-axis distance from the fifth lens to the sixth lens;

[0130] T56 / BFL = 0.53, where T56 is the on-axis distance from the fifth lens to the sixth lens, and BFL is the on-axis distance from the image side surface of the sixth lens to the imaging surface of the camera lens group;

[0131] CT2 / CT3 = 1.96, where CT2 is the central thickness of the second lens, and CT3 is the central thickness of the third lens;

[0132] T23 / T12 = 1.26, where T23 is the on-axis distance from the second lens to the third lens, and T12 is the on-axis distance from the first lens to the second lens;

[0133] (T23 + T34 + T45) / Tr3r8 = 0.3414 / 2.1130, where T23 is the on-axis distance from the second lens to the third lens, T34 is the on-axis distance from the third lens to the fourth lens, T45 is the on-axis distance from the fourth lens to the fifth lens, and Tr3r8 is the on-axis distance from the object side surface of the second lens to the image side surface of the fourth lens;

[0134] DT11 / TTL = 0.50, where DT11 is the maximum effective radius of the object side surface of the first lens, and TTL is the on-axis distance from the object side surface of the first lens to the imaging surface of the camera lens group;

[0135] DT11 / DT62 = 2.35, where DT11 is the maximum effective radius of the object side surface of the first lens, and DT62 is the maximum effective radius of the image side surface of the sixth lens;

[0136] DT11 / ImgH = 1.75, where DT11 is the maximum effective radius of the object side of the first lens, and ImgH is half of the diagonal length of the effective pixel area on the imaging surface.

[0137] ET2 / CT2 = 1.07, where ET2 is the edge thickness of the second lens at the maximum effective diameter, and CT2 is the central thickness of the second lens;

[0138] SAG61 / CT6 = -1.69, where SAG61 is the axial distance between the intersection of the object side of the sixth lens and the optical axis and the vertex of the effective radius of the object side of the sixth lens, and CT6 is the central thickness of the sixth lens;

[0139] SAG51 / SAG52 = -0.31, where SAG51 is the axial distance between the intersection of the object side of the fifth lens and the optical axis and the vertex of the effective radius of the object side of the fifth lens, and SAG52 is the axial distance between the intersection of the image side of the fifth lens and the optical axis and the vertex of the effective radius of the image side of the fifth lens;

[0140] |SAG41 / SAG42| = 0.15, where SAG41 is the axial distance between the intersection of the object side of the fourth lens and the optical axis and the vertex of the effective radius of the object side of the fourth lens, and SAG42 is the axial distance between the intersection of the image side of the fourth lens and the optical axis and the vertex of the effective radius of the image side of the fourth lens;

[0141] DT12 / SAG12 = 1.09, where DT12 is the maximum effective radius of the image side of the first lens, and SAG12 is the axial distance between the intersection of the image side of the first lens and the optical axis and the vertex of the effective radius of the image side of the first lens;

[0142] SAG52 / SAG61 = 0.80, where SAG52 is the axial distance between the intersection of the image side of the fifth lens and the optical axis and the vertex of the effective radius of the image side of the fifth lens, and SAG61 is the axial distance between the intersection of the object side of the sixth lens and the optical axis and the vertex of the effective radius of the object side of the sixth lens;

[0143] DT31 / DT52 = 0.50, where DT31 is the maximum effective radius of the object side of the third lens, and DT52 is the maximum effective radius of the image side of the fifth lens;

[0144] SAG21 / CT2 = -0.14, where SAG21 is the axial distance between the intersection of the object side of the second lens and the optical axis and the vertex of the effective radius of the object side of the second lens, and CT2 is the central thickness of the second lens;

[0145] (SAG11-CT1) / CT1 = 0.45, where SAG11 is the axial distance between the intersection of the object side surface of the first lens and the optical axis and the vertex of the effective radius of the object side surface of the first lens, and CT1 is the central thickness of the first lens;

[0146] (DT62-DT61) / (DT61-DT52) = 2.71, where DT62 is the maximum effective radius of the image side surface of the sixth lens, DT61 is the maximum effective radius of the object side surface of the sixth lens, and DT52 is the maximum effective radius of the image side surface of the fifth lens.

[0147] In Embodiment 1, the object side surface and the image side surface of any one of the first lens E1 to the sixth lens E6 are aspherical surfaces. The surface profile x of each aspherical lens can be defined by, but not limited to, the following aspherical formula:

[0148]

[0149] where x is the sagitta, the distance from the vertex of the aspherical surface when the aspherical surface is at a position with a height of h along the optical axis; c is the paraxial curvature of the aspherical surface, c = 1 / R (i.e., the paraxial curvature c is the reciprocal of the radius of curvature R in Table 1); k is the conic coefficient; and Ai is the correction coefficient of the i-th order of the aspherical surface.

[0150] In Embodiment 1, the object side surface and the image side surface of any one of the first lens E1 to the fifth lens E5 are aspherical surfaces. Table 3 shows the higher-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for each aspherical mirror surface S1 - S12 in Embodiment 1:

[0151]

[0152] Table 3

[0153] Figure 1a shows the axial chromatic aberration curve of the camera lens group in Embodiment 1, which represents the deviation of the convergence points of light rays with different wavelengths after passing through the lens. Figure 1b shows the astigmatism curve of the camera lens group in Embodiment 1, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 1c shows the longitudinal chromatic aberration curve of the camera lens group in Embodiment 1, which represents the deviation of different image heights on the imaging plane after light rays pass through the lens. According to Figures 1a to 1c As can be seen from the shown, the camera lens group given in Embodiment 1 can achieve good imaging quality. Specific Embodiment 2

[0155] Figure 2This is a schematic structural diagram of the lens group in Embodiment 2 of the camera lens group of the present invention. The camera lens group includes, sequentially arranged along the optical axis from the object side to the image side: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an imaging surface S15. Among them:

[0156] The first lens E1 has a negative optical power. Its object surface S1 is convex, and its image surface S2 is concave; the second lens E2 has a positive optical power. Its object surface S3 is concave, and its image surface S4 is convex; the third lens E3 has a positive optical power. Its object surface S5 is convex, and its image surface S6 is convex; the fourth lens E4 has a negative optical power. Its object surface S7 is convex, and its image surface S8 is concave; the fifth lens E5 has a positive optical power. Its object surface S9 is convex, and its image surface S10 is convex; the sixth lens E6 has a negative optical power. Its object surface S11 is convex, and its image surface S12 is concave; the filter E7 has an object surface S13 and an image surface S14. Light from the object sequentially passes through the surfaces S1 to S14 and finally forms an image on the imaging surface S15.

[0157] As shown in Table 4, it is the basic parameter table of the camera lens group in Embodiment 2. Among them, the unit of the radius of curvature, focal length, and thickness / distance is millimeter (mm):

[0158]

[0159] Table 4

[0160] As shown in Table 5, in Embodiment 2, the distance TTL from the object surface S1 of the first lens E1 to the imaging surface S15 on the optical axis is 6.56 mm, half of the diagonal length of the effective pixel area on the imaging surface S15 is ImgH = 1.87 mm, the maximum field of view angle FOV of the optical imaging system is 204.0°, the aperture value Fno of the camera lens group is 2.62, and the total effective focal length f of the camera lens group is 1.28 mm. The parameters of each relationship are as explained in the exemplary embodiment, and the values of each relationship are listed in the following table:

[0161]

[0162]

[0163] Table 5

[0164] In Embodiment 2, the object surfaces and image surfaces of any one of the second lens E2 to the sixth lens E6 are aspherical surfaces. Table 6 shows the higher-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 of the aspherical surfaces S3 - S12 that can be used in Embodiment 2:

[0165]

[0166] Table 6

[0167] Figure 2a shows the axial chromatic aberration curve of the camera lens group of Embodiment 2, which represents the deviation of the focusing points of light rays with different wavelengths after passing through the lens. Figure 2b shows the astigmatism curve of the camera lens group of Embodiment 2, which represents the curvature of the meridional image plane and the sagittal image plane. Figure 2c shows the lateral chromatic aberration curve of the camera lens group of Embodiment 2, which represents the deviation of different image heights of light rays on the imaging plane after passing through the lens. According to Figures 2a to 2c as can be seen from the figure, the camera lens group given in Embodiment 2 can achieve good imaging quality. Specific Embodiment 3

[0169] Figure 3 is a schematic structural diagram of the lens group of Embodiment 3 of the camera lens group of the present invention. The camera lens group includes, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an imaging surface S15. Among them:

[0170] The first lens E1 has a negative optical power. Its object surface S1 is convex and its image surface S2 is concave; the second lens E2 has a positive optical power. Its object surface S3 is concave and its image surface S4 is convex; the third lens E3 has a positive optical power. Its object surface S5 is convex and its image surface S6 is convex; the fourth lens E4 has a negative optical power. Its object surface S7 is convex and its image surface S8 is concave; the fifth lens E5 has a positive optical power. Its object surface S9 is convex and its image surface S10 is convex; the sixth lens E6 has a negative optical power. Its object surface S11 is convex and its image surface S12 is concave; the filter E7 has an object surface S13 and an image surface S14. Light from the object sequentially passes through the surfaces S1 to S14 and finally forms an image on the imaging surface S15.

[0171] As shown in Table 7, it is the basic parameter table of the camera lens group of Embodiment 3. Among them, the unit of the radius of curvature, focal length, and thickness / distance is millimeter (mm):

[0172]

[0173] Table 7

[0174] As shown in Table 8, in Embodiment 3, the distance TTL from the object side surface S1 of the first lens E1 to the imaging surface S15 on the optical axis is 6.40 mm, half of the diagonal length of the effective pixel area on the imaging surface S15 is ImgH = 1.95 mm, the maximum field of view angle FOV of the optical imaging system is 204.0°, the aperture value Fno of the camera lens group is 2.62, and the total effective focal length f of the camera lens group is 1.24 mm. The parameters of each relational expression are as explained in the exemplary embodiment, and the values of each relational expression are listed in the following table:

[0175]

[0176]

[0177] Table 8

[0178] In Embodiment 3, the object side surface and the image side surface of any one of the second lens E2 to the sixth lens E6 are aspherical surfaces. Table 9 shows the high-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 of the aspherical mirror surfaces S3 - S12 that can be used in Embodiment 3:

[0179]

[0180] Table 9

[0181] Figure 3a Shows the axial chromatic aberration curve of the camera lens group in Embodiment 3, which represents the deviation of the convergence points of light rays with different wavelengths after passing through the lens. Figure 3b Shows the astigmatism curve of the camera lens group in Embodiment 3, which represents the curvature of the meridional image plane and the curvature of the sagittal image plane. Figure 3c Shows the lateral chromatic aberration curve of the camera lens group in Embodiment 3, which represents the deviation of different image heights on the imaging surface after the light rays pass through the lens. According to Figures 3a to 3c As can be seen from the shown, the camera lens group given in Embodiment 3 can achieve good imaging quality. Specific Embodiment 4

[0183] Figure 4 This is a schematic structural diagram of the lens group of Embodiment 4 of the camera lens group of the present invention. The camera lens group includes, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a diaphragm STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an imaging surface S15. Among them:

[0184] The first lens E1 has a negative focal power, its object side S1 is convex, and its image side S2 is concave; the second lens E2 has a positive focal power, its object side S3 is concave, and its image side S4 is convex; the third lens E3 has a positive focal power, its object side S5 is convex, and its image side S6 is convex; the fourth lens E4 has a negative focal power, its object side S7 is convex, and its image side S8 is concave; the fifth lens E5 has a positive focal power, its object side S9 is convex, and its image side S10 is convex; the sixth lens E6 has a negative focal power, its object side S11 is concave, and its image side S12 is concave; the filter E7 has an object side S13 and an image side S14. The light from the object sequentially passes through the surfaces of S1 to S14 and finally forms an image on the imaging surface S15.

[0185] As shown in Table 10, it is the basic parameter table of the camera lens group of Example 4, where the unit of the radius of curvature, focal length, and thickness / distance is millimeter (mm):

[0186]

[0187] Table 10

[0188] As shown in Table 11, in Example 4, the distance TTL on the optical axis from the object side S1 of the first lens E1 to the imaging surface S15 is 6.40 mm, half of the diagonal length of the effective pixel area on the imaging surface S15 is ImgH = 2.12 mm, the maximum field of view angle FOV of the optical imaging system is 204.0°, the aperture value Fno of the camera lens group is 2.62, and the total effective focal length f of the camera lens group is 1.21 mm. The parameters of each relationship are as explained in the exemplary embodiment, and the values of each relationship are listed in the following table:

[0189]

[0190]

[0191] Table 11

[0192] In Example 4, the object side and the image side of any one of the second lens E2 to the sixth lens E6 are aspherical surfaces. Table 12 shows the higher-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 of the aspherical mirror surfaces S3 - S12 that can be used in Example 4:

[0193]

[0194] Table 12

[0195] Figure 4a Shows the axial chromatic aberration curve of the camera lens group of Example 4, which represents the deviation of the focusing points of light rays of different wavelengths after passing through the lens.Figure 4b The astigmatism curve of the imaging lens group of Embodiment 4 is shown, which represents the curvature of the meridional image plane and the sagittal image plane. Figure 4c The longitudinal chromatic aberration curve of the imaging lens group of Embodiment 4 is shown, which represents the deviation of different image heights on the imaging plane after light passes through the lens. According to Figures 4a to 4c As can be seen from the figure, the imaging lens group given in Embodiment 4 can achieve good imaging quality. Specific Embodiment 5

[0197] Figure 5 This is a schematic structural diagram of the lens group of Embodiment 5 of the imaging lens group of the present invention. The imaging lens group includes, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an imaging surface S15. Among them:

[0198] The first lens E1 has a negative focal power. Its object side surface S1 is convex, and its image side surface S2 is concave; the second lens E2 has a positive focal power. Its object side surface S3 is concave, and its image side surface S4 is convex; the third lens E3 has a positive focal power. Its object side surface S5 is convex, and its image side surface S6 is convex; the fourth lens E4 has a negative focal power. Its object side surface S7 is concave, and its image side surface S8 is concave; the fifth lens E5 has a positive focal power. Its object side surface S9 is convex, and its image side surface S10 is convex; the sixth lens E6 has a negative focal power. Its object side surface S11 is convex, and its image side surface S12 is concave; the filter E7 has an object side surface S13 and an image side surface S14. Light from the object sequentially passes through the surfaces of S1 to S14 and finally forms an image on the imaging surface S15.

[0199] As shown in Table 13, it is the basic parameter table of the imaging lens group of Embodiment 5. Among them, the unit of the radius of curvature, focal length, and thickness / distance is millimeter (mm):

[0200]

[0201] Table 13

[0202] As shown in Table 14, in Embodiment 5, the distance TTL on the optical axis from the object side surface S1 of the first lens E1 to the imaging surface S15 is 6.84 mm, half of the diagonal length of the effective pixel region on the imaging surface S15 is ImgH = 1.81 mm, the maximum field of view angle FOV of the optical imaging system is 210.0°, the aperture value Fno of the imaging lens group is 2.62, and the total effective focal length f of the imaging lens group is 0.97 mm. The parameters of each relationship are as explained in the exemplary embodiment, and the values of each relationship are listed in the following table:

[0203]

[0204] Table 14

[0205] In Embodiment 5, the object side and the image side of any one of the first lens E1 to the sixth lens E6 are aspherical surfaces. Table 15 shows the higher-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 of the aspherical mirror surfaces S1-S12 that can be used in Embodiment 5:

[0206]

[0207] Table 15

[0208] Figure 5a shows the axial chromatic aberration curve of the camera lens group in Embodiment 5, which represents the deviation of the convergence points of light rays of different wavelengths after passing through the lens. Figure 5b shows the astigmatism curve of the camera lens group in Embodiment 5, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 5c shows the lateral chromatic aberration curve of the camera lens group in Embodiment 5, which represents the deviation of different image heights of light rays on the imaging plane after passing through the lens. According to Figures 5a to 5c As can be seen from the figure, the camera lens group given in Embodiment 5 can achieve good imaging quality. Specific Embodiment 6

[0210] Figure 6 This is a schematic diagram of the lens group structure of Embodiment 6 of the camera lens group of the present invention. The camera lens group includes, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a stop STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an imaging surface S15. Among them:

[0211] The first lens E1 has a negative optical power. Its object side S1 is a convex surface, and its image side S2 is a concave surface; the second lens E2 has a positive optical power. Its object side S3 is a convex surface, and its image side S4 is a convex surface; the third lens E3 has a positive optical power. Its object side S5 is a convex surface, and its image side S6 is a convex surface; the fourth lens E4 has a negative optical power. Its object side S7 is a concave surface, and its image side S8 is a concave surface; the fifth lens E5 has a positive optical power. Its object side S9 is a convex surface, and its image side S10 is a convex surface; the sixth lens E6 has a negative optical power. Its object side S11 is a concave surface, and its image side S12 is a concave surface; the filter E7 has an object side S13 and an image side S14. Light from the object sequentially passes through the surfaces S1 to S14 and finally forms an image on the imaging surface S15.

[0212] As shown in Table 16, it is the basic parameter table of the camera lens group in Embodiment 6. Among them, the unit of the radius of curvature, the focal length, and the thickness / distance is millimeter (mm):

[0213]

[0214] Table 16

[0215] As shown in Table 17, in Embodiment 6, the distance TTL on the optical axis from the object side S1 of the first lens E1 to the imaging surface S15 is 7.50 mm, half of the diagonal length of the effective pixel region on the imaging surface S15 is ImgH = 1.89 mm, the maximum field of view angle FOV of the optical imaging system is 208.0°, the aperture value Fno of the camera lens group is 2.62, and the total effective focal length f of the camera lens group is 1.01 mm. The parameters of each relational expression are as explained in the exemplary embodiment, and the values of each relational expression are listed in the following table:

[0216]

[0217]

[0218] Table 17

[0219] In Embodiment 6, the object side and the image side of any one of the first lens E1 to the sixth lens E6 are aspherical surfaces. Table 18 shows the higher-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 of the aspherical mirror surfaces S1 - S12 that can be used in Embodiment 6:

[0220]

[0221] Table 18

[0222] Figure 6a Shows the axial chromatic aberration curve of the camera lens group of Embodiment 6, which represents the deviation of the convergence points of light rays of different wavelengths after passing through the lens. Figure 6b Shows the astigmatism curve of the camera lens group of Embodiment 6, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 6c Shows the lateral chromatic aberration curve of the camera lens group of Embodiment 6, which represents the deviation of different image heights of light rays on the imaging surface after passing through the lens. According to Figures 6a to 6c As can be seen from the above, the camera lens group given in Embodiment 6 can achieve good imaging quality. Specific Embodiment 7

[0224] Figure 7 It is a schematic structural diagram of the lens group of Embodiment 7 of the camera lens group of the present invention. The camera lens group includes, in order from the object side to the image side along the optical axis: a first lens E1, a second lens E2, a diaphragm STO, a third lens E3, a fourth lens E4, a fifth lens E5, a sixth lens E6, a filter E7, and an imaging surface S15. Among them:

[0225] The first lens E1 has a negative focal power, its object side S1 is convex, and its image side S2 is concave; the second lens E2 has a positive focal power, its object side S3 is concave, and its image side S4 is convex; the third lens E3 has a positive focal power, its object side S5 is convex, and its image side S6 is convex; the fourth lens E4 has a negative focal power, its object side S7 is convex, and its image side S8 is concave; the fifth lens E5 has a positive focal power, its object side S9 is convex, and its image side S10 is convex; the sixth lens E6 has a negative focal power, its object side S11 is concave, and its image side S12 is concave; the filter E7 has an object side S13 and an image side S14. Light from the object sequentially passes through the surfaces of S1 to S14 and finally forms an image on the imaging surface S15.

[0226] As shown in Table 19, it is the basic parameter table of the camera lens group of Example 7. Among them, the unit of the radius of curvature, focal length, and thickness / distance is millimeter (mm):

[0227]

[0228] Table 19

[0229] As shown in Table 20, in Example 7, the distance TTL on the optical axis from the object side S1 of the first lens E1 to the imaging surface S15 is 6.40 mm, half of the diagonal length of the effective pixel area on the imaging surface S15 is ImgH = 2.21 mm, the maximum field of view angle FOV of the optical imaging system is 216.0°, the aperture value Fno of the camera lens group is 2.62, and the total effective focal length f of the camera lens group is 1.21 mm. The parameters of each relationship are as explained in the exemplary embodiment, and the values of each relationship are listed in the following table:

[0230]

[0231]

[0232] Table 20

[0233] In Example 7, the object side and the image side of any one of the second lens E1 to the sixth lens E6 are aspherical surfaces. Table 21 shows the higher-order term coefficients A4, A6, A8, A10, A12, A14, A16, A18, and A20 that can be used for the aspherical mirror surfaces S3 - S12 in Example 7:

[0234]

[0235] Table 21

[0236] Figure 7a Shows the axial chromatic aberration curve of the camera lens group of Example 7, which represents the deviation of the converging points of light rays of different wavelengths after passing through the lens.Figure 7b The astigmatism curve of the camera lens group of Embodiment 7 is shown, which represents the meridional image plane curvature and the sagittal image plane curvature. Figure 7c The longitudinal chromatic aberration curve of the camera lens group of Embodiment 7 is shown, which represents the deviation of different image heights on the imaging plane after the light passes through the lens. According to Figures 7a to 7c As can be seen from the figure, the camera lens group given in Embodiment 7 can achieve good imaging quality.

[0237] Advantages of the present invention:

[0238] The camera lens group provided by the present invention includes multiple lenses, such as the first lens to the sixth lens. It has a large field of view and can be used as a fish-eye lens. Although the object-image difference of the camera lens group with this structure is large due to large distortion, it does not affect the resolution at all, and can ensure the one-to-one correspondence between the object point and the image point, and can achieve clear imaging in a large range. At the same time, the camera lens with the above structure has the characteristics of ultra-thin and miniaturization, and can have important applications in the fields of vehicle-mounted, security monitoring, etc.

[0239] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, improvements, equivalent replacements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. An imaging lens group, characterized in that, The number of lenses with optical power in the camera lens group is six, and the camera lens group includes, arranged in sequence from the object side to the image side along the optical axis: A first lens with negative optical power, whose object side is convex and image side is concave; A second lens with positive optical power, whose image side is convex; A third lens with positive optical power, whose object side is convex and image side is convex; A fourth lens with negative optical power, whose image side is concave; A fifth lens with positive optical power, whose object side is convex and image side is convex; A sixth lens with negative optical power, whose image side is concave; Among them, the maximum field of view FOV of the camera lens group and the distance TTL on the optical axis from the object side of the first lens to the imaging surface of the camera lens group satisfy: 1.11 mm -1 ≤5×tan(FOV - 90°) / TTL≤1.53 mm -1 ; The distance T45 between the fourth lens and the fifth lens on the optical axis and the distance T56 between the fifth lens and the sixth lens on the optical axis satisfy: 0.14 ≤ T45 / T56 ≤ 0.32; The maximum effective radius DT11 of the object side of the first lens and the maximum effective radius DT12 of the image side of the first lens satisfy: 1.73 ≤ (DT11 - DT12) / DT12 ≤ 2.

65.

2. The camera lens group according to claim 1, characterized in that, The effective focal length f3 of the third lens and the effective focal length f of the camera lens group satisfy: 1.15 ≤ f3 / f ≤ 1.

42.

3. The camera lens group according to claim 1, characterized in that The curvature radius R1 of the object side of the first lens and the curvature radius R10 of the image side of the fifth lens satisfy: -10 ≤ R1 / R10 ≤ -5.

24.

4. The camera lens group according to claim 1, characterized in that, The distance T56 between the fifth lens and the sixth lens on the optical axis and the distance BFL from the image side of the sixth lens to the imaging surface of the camera lens group on the optical axis satisfy: 0.41 ≤ T56 / BFL < 1.

1.

5. The camera lens group according to claim 1, characterized in that, The central thickness CT2 of the second lens and the central thickness CT3 of the third lens satisfy: 1.41 ≤ CT2 / CT3 ≤ 3.

54.

6. The camera lens group according to claim 1, wherein The distance T23 between the second lens and the third lens on the optical axis and the distance T12 between the first lens and the second lens on the optical axis satisfy: 0.43 ≤ T23 / T12 ≤ 1.

26.

7. The camera lens group according to claim 1, characterized in that, The distance T23 between the second lens and the third lens on the optical axis, the distance T34 between the third lens and the fourth lens on the optical axis, the distance T45 between the fourth lens and the fifth lens on the optical axis, and the distance Tr3r8 from the object side of the second lens to the image side of the fourth lens on the optical axis satisfy: 0.2452 / 1.9414 ≤ (T23 + T34 + T45) / Tr3r8 ≤ 0.3414 / 2.1130.

8. The camera lens group according to claim 1, wherein, The maximum effective radius DT11 of the object side of the first lens and the distance TTL from the object side of the first lens to the imaging surface of the camera lens group on the optical axis satisfy: 0.5 ≤ DT11 / TTL ≤ 0.

7.

9. The camera lens group according to claim 1, wherein, The maximum effective radius DT11 of the object side of the first lens and the maximum effective radius DT62 of the image side of the sixth lens satisfy: 2.27 ≤ DT11 / DT62 ≤ 4.

37.

10. The camera lens group according to claim 1, characterized in that, The maximum effective radius DT11 of the object side of the first lens and half of the diagonal length ImgH of the effective pixel region on the imaging surface satisfy: 1.63 ≤ DT11 / ImgH ≤ 2.

79.

11. The camera lens group according to claim 1, wherein, The edge thickness ET2 of the second lens at the maximum effective diameter and the central thickness CT2 of the second lens satisfy: 1.01 ≤ ET2 / CT2 ≤ 1.

07.

12. The camera lens group according to claim 1, wherein, The distance SAG61 on the optical axis between the intersection point of the object side of the sixth lens and the optical axis and the vertex of the effective radius of the object side of the sixth lens and the central thickness CT6 of the sixth lens satisfy: -1.7 ≤ SAG61 / CT6 ≤ -1.

43.

13. The camera lens group according to claim 1, characterized in that, The distance SAG51 on the optical axis between the intersection point of the object side of the fifth lens and the optical axis and the vertex of the effective radius of the object side of the fifth lens and the distance SAG52 on the optical axis between the intersection point of the image side of the fifth lens and the optical axis and the vertex of the effective radius of the image side of the fifth lens satisfy: -0.33 ≤ SAG51 / SAG52 ≤ -0.

23.

14. The camera lens group according to claim 1, wherein, The distance SAG41 on the optical axis between the intersection point of the object side of the fourth lens and the optical axis and the vertex of the effective radius of the object side of the fourth lens and the distance SAG42 on the optical axis between the intersection point of the image side of the fourth lens and the optical axis and the vertex of the effective radius of the image side of the fourth lens satisfy: 0.09 ≤ |SAG41 / SAG42| ≤ 0.

16.

15. The camera lens group according to claim 1, wherein, The maximum effective radius DT12 of the image side of the first lens and the distance SAG12 on the optical axis between the intersection point of the image side of the first lens and the optical axis and the vertex of the effective radius of the image side of the first lens satisfy: 0.85 ≤ DT12 / SAG12 ≤ 1.

11.

16. The camera lens group according to claim 1, wherein The distance SAG52 on the optical axis between the intersection point of the image side of the fifth lens and the optical axis and the vertex of the effective radius of the image side of the fifth lens and the distance SAG61 on the optical axis between the intersection point of the object side of the sixth lens and the optical axis and the vertex of the effective radius of the object side of the sixth lens satisfy: 0.44 ≤ SAG52 / SAG61 ≤ 0.

85.

17. The camera lens group according to claim 1, characterized in that, The maximum effective radius DT31 of the object side of the third lens and the maximum effective radius DT52 of the image side of the fifth lens satisfy: 0.5 ≤ DT31 / DT52 ≤ 0.

64.

18. The camera lens group according to claim 1, wherein, The distance SAG21 on the optical axis between the intersection point of the object side of the second lens and the optical axis and the vertex of the effective radius of the object side of the second lens and the central thickness CT2 of the second lens satisfy: -0.14 ≤ SAG21 / CT2 < 0.

19. The camera lens group according to claim 1, characterized in that, The distance SAG11 on the optical axis between the intersection point of the object side of the first lens and the optical axis and the vertex of the effective radius of the object side of the first lens and the central thickness CT1 of the first lens satisfy: 0.08 ≤ (SAG11 - CT1) / CT1 ≤ 0.

89.

20. The camera lens group according to claim 1, wherein, The maximum effective radius DT62 of the image side of the sixth lens, the maximum effective radius DT61 of the object side of the sixth lens, and the maximum effective radius DT52 of the image side of the fifth lens satisfy: 2.3 ≤ (DT62 - DT61) / (DT61 - DT52) ≤ 3.58.

Images