Camera lens

Abstract

The application relates to the field of optical lenses and discloses a camera optical lens which comprises seven lenses in total, the seven lenses are sequentially arranged from the object side to the image side as follows: a first lens with negative refractive power, a second lens with positive refractive power, a third lens with positive refractive power, a fourth lens with positive refractive power, a fifth lens with negative refractive power, a sixth lens with positive refractive power and a seventh lens with negative refractive power, the object side surface and the image side surface of the seventh lens are free curved surfaces; wherein the focal length of the camera optical lens is f; the focal length of the first lens is f1; the focal length of the third lens is f3; the focal length of the fourth lens is f4; the refractive index of the third lens is nd3; the refractive index of the sixth lens is nd6; the refractive index of the seventh lens is nd7, and the following relationships are satisfied: -1.52 <= f1 / f <= -1.38; 1.56 <= nd3 <= 1.59; 1.53 <= nd6 <= 1.81; 1.61 <= nd7 <= 1.67; 2.04 <= f3 / f4 <= 2.27.

Description

Technical Field

[0001] This invention relates to the field of optical lenses, and in particular to a camera optical lens suitable for handheld terminal devices such as smartphones and digital cameras, as well as camera devices such as monitors and PC lenses. Background Technology

[0002] With the development of imaging lenses, people have increasingly higher requirements for lens imaging. "Night scene photography" and "background blur" have become important indicators for evaluating lens imaging standards. Currently, most lenses use rotationally symmetric aspherical surfaces. These aspherical surfaces only have sufficient degrees of freedom in the meridional plane and cannot effectively correct off-axis aberrations. Furthermore, the existing structured light power distribution, lens spacing, and lens shape settings are insufficient, resulting in inadequate ultra-thin and wide-angle lens designs. Freeform surfaces, a non-rotationally symmetric surface type, can better balance aberrations and improve image quality, and the processing of freeform surfaces is gradually maturing. With the increasing demands for lens imaging, incorporating freeform surfaces into lens design is crucial, especially in the design of wide-angle and ultra-wide-angle lenses. Summary of the Invention

[0003] To address the aforementioned problems, the present invention aims to provide a camera optical lens that, while possessing excellent optical performance, meets the design requirements of large aperture, ultra-thin design, wide-angle lens, and low distortion.

[0004] To solve the above-mentioned technical problems, the present invention provides a camera optical lens, which comprises seven lenses in total. The seven lenses are arranged in the following order from the object side to the image side: a first lens with negative refractive power, a second lens with positive refractive power, a third lens with positive refractive power, a fourth lens with positive refractive power, a fifth lens with negative refractive power, a sixth lens with positive refractive power, and a seventh lens with negative refractive power. The object side and image side of the seventh lens are free-form surfaces.

[0005] Wherein, the focal length of the camera optical lens is f; the focal length of the first lens is f1; the focal length of the third lens is f3; the focal length of the fourth lens is f4; the refractive index of the third lens is nd3; the refractive index of the sixth lens is nd6; and the refractive index of the seventh lens is nd7, and the following relationship is satisfied:

[0006] -1.52≤f1 / f≤-1.38;

[0007] 1.56≤nd3≤1.59;

[0008] 1.53≤nd6≤1.81;

[0009] 1.61≤nd7≤1.67;

[0010] 2.04≤f3 / f4≤2.27.

[0011] Preferably, the radius of curvature of the object-side surface of the seventh lens is R13, and the radius of curvature of the image-side surface of the seventh lens is R14, satisfying the following relationship:

[0012] 1.06≤(R13+R14) / (R13-R14)≤1.22.

[0013] Preferably, the refractive index of the fifth lens is nd5, and it satisfies the following relationship:

[0014] 1.64≤nd5≤1.67.

[0015] Preferably, the object-side surface of the first lens is convex at the paraxial position, and the image-side surface of the first lens is concave at the paraxial position.

[0016] The center radius of curvature of the object-side surface of the first lens is R1, the center radius of curvature of the image-side surface of the first lens is R2, the axial thickness of the first lens is d1, and the total optical length of the imaging optical lens is TTL, and satisfies the following relationship:

[0017] 1.43≤(R1+R2) / (R1-R2)≤1.95;

[0018] 0.04≤d1 / TTL≤0.07.

[0019] Preferably, the object-side surface of the second lens is convex at the paraxial position, and the image-side surface of the second lens is concave at the paraxial position.

[0020] The focal length of the second lens is f2, the central radius of curvature of the object-side surface of the second lens is R3, the central radius of curvature of the image-side surface of the second lens is R4, the axial thickness of the second lens is d3, and the total optical length of the imaging optical lens is TTL, satisfying the following relationship:

[0021] 3.10≤f² / f≤3.40;

[0022] -3.26≤(R3+R4) / (R3-R4)≤-2.79;

[0023] 0.04≤d3 / TTL≤0.06.

[0024] Preferably, the object-side surface of the third lens is convex at the paraxial position, and the image-side surface of the third lens is concave at the paraxial position.

[0025] The focal length of the third lens is f3, the central radius of curvature of the object side of the third lens is R5, the central radius of curvature of the image side of the third lens is R6, the on-axis thickness of the third lens is d5, and the total optical length of the imaging optical lens is TTL, and the following relationship is satisfied:

[0026] 3.04≤f3 / f≤3.43;

[0027] -1.42≤(R5+R6) / (R5-R6)≤-1.28;

[0028] 0.05≤d5 / TTL≤0.06.

[0029] Preferably, the object-side surface of the fourth lens is convex at the paraxial position, and the image-side surface of the fourth lens is convex at the paraxial position.

[0030] The fourth lens has a focal length of f4, a central radius of curvature of the object side of the fourth lens of R7, a central radius of curvature of the image side of the fourth lens of R8, an on-axis thickness of d7, and a total optical length of TTL, satisfying the following relationship:

[0031] 1.48≤f4 / f≤1.52;

[0032] 0.37≤(R7+R8) / (R7-R8)≤0.45;

[0033] 0.10≤d7 / TTL≤0.12.

[0034] Preferably, the object-side surface of the fifth lens is concave near the axis, and the image-side surface of the fifth lens is convex near the axis.

[0035] The fifth lens has a focal length of f5, a central radius of curvature of the object-side surface of the fifth lens of R9, a central radius of curvature of the image-side surface of the fifth lens of R10, an axial thickness of d9, and a total optical length of TTL, satisfying the following relationship:

[0036] -3.99≤f5 / f≤-3.63;

[0037] -5.59≤(R9+R10) / (R9-R10)≤-3.20;

[0038] 0.03≤d9 / TTL≤0.04.

[0039] Preferably, the image-side surface of the sixth lens is convex at the paraxial position, the focal length of the sixth lens is f6, the central radius of curvature of the object-side surface of the sixth lens is R11, the central radius of curvature of the image-side surface of the sixth lens is R12, the axial thickness of the sixth lens is d11, and the total optical length of the imaging optical lens is TTL, and satisfies the following relationship:

[0040] 0.75≤f6 / f≤0.79;

[0041] 0.92≤(R11+R12) / (R11-R12)≤1.10;

[0042] 0.18≤d11 / TTL≤0.20.

[0043] Preferably, the object-side surface of the seventh lens is convex at the paraxial position, and the image-side surface of the seventh lens is concave at the paraxial position.

[0044] The seventh lens has a focal length of f7, an on-axis thickness of d13, and a total optical length of TTL, satisfying the following relationship:

[0045] -0.95≤f7 / f≤-0.85;

[0046] 0.12≤d13 / TTL≤0.14.

[0047] Preferably, the focal length of the seventh lens in the x-direction is f7x, the focal length of the seventh lens in the y-direction is f7y, and they satisfy the following relationship:

[0048] -0.93≤f7y / f≤-0.85;

[0049] 0.99≤f7y / f7x≤1.01.

[0050] The beneficial effects of the present invention are as follows: the camera optical lens of the present invention has excellent optical characteristics, and has the characteristics of large aperture, wide angle, ultra-thinness, low optical distortion, and low SMIA TV distortion. At the same time, the present invention has a free-form surface, which helps to control distortion, and is especially suitable for mobile phone camera optical lens assemblies and WEB camera optical lenses composed of high-pixel CCD, CMOS and other camera elements. Attached Figure Description

[0051] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort, wherein:

[0052] Figure 1 This is a schematic diagram of the structure of the camera optical lens according to the first embodiment of the present invention;

[0053] Figure 2 yes Figure 1 A schematic diagram of the RMS spot diameter of the camera optical lens shown.

[0054] Figure 3 This is a schematic diagram of the structure of the camera optical lens according to the second embodiment of the present invention;

[0055] Figure 4 yes Figure 3 A schematic diagram of the RMS spot diameter of the camera optical lens shown.

[0056] Figure 5 This is a schematic diagram of the structure of the camera optical lens according to the third embodiment of the present invention;

[0057] Figure 6 yes Figure 5 A schematic diagram of the RMS spot diameter of the camera optical lens shown.

[0058] Figure 7 This is a schematic diagram of the structure of the camera optical lens according to the fourth embodiment of the present invention;

[0059] Figure 8 yes Figure 7 The diagram shows the RMS spot diameter of the camera optical lens. Detailed Implementation

[0060] To make the objectives, technical solutions, and advantages of this invention clearer, the various embodiments of this invention will be described in detail below with reference to the accompanying drawings. However, those skilled in the art will understand that many technical details have been provided in the various embodiments of this invention to facilitate a better understanding of the invention. However, the technical solutions claimed in this invention can be implemented even without these technical details and with various variations and modifications based on the following embodiments.

[0061] (First Implementation)

[0062] Referring to the accompanying drawings, the present invention provides a camera optical lens 10. Figure 1 The image shown is a camera optical lens 10 according to a first embodiment of the present invention. The camera optical lens 10 is composed of seven lenses, arranged sequentially from the object side to the image side: a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a seventh lens L7. An optical element such as an optical filter GF may be disposed between the seventh lens L7 and the image plane Si.

[0063] In this embodiment, the first lens L1 has negative refractive power, the second lens L2 has positive refractive power, the third lens L3 has positive refractive power, the fourth lens L4 has positive refractive power, the fifth lens L5 has negative refractive power, the sixth lens L6 has positive refractive power, and the object-side and image-side surfaces of the seventh lens L7 are freeform surfaces, and the seventh lens L7 has negative refractive power. Those skilled in the art will understand that, to better correct aberrations, it is best to design the surfaces of these seven lenses as aspherical.

[0064] In this embodiment, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, and the seventh lens L7 are all made of plastic. In other optional embodiments, the lenses may be made of other materials.

[0065] In this embodiment, the focal length of the camera optical lens 10 is defined as f; the focal length of the first lens L1 is f1, satisfying the following relationship: -1.52≤f1 / f≤-1.38, which specifies the negative optical power of the first lens L1. Satisfying this condition helps the camera optical lens 10 obtain good field curvature balance capability, thereby improving image quality.

[0066] In this embodiment, the refractive index of the third lens L3 is defined as nd3, which satisfies the following relationship: 1.56≤nd3≤1.59. This specifies the refractive index of the third lens L3. The refractive power within this range is beneficial for the thinning of the lens and also allows the use of plastic materials.

[0067] In this embodiment, the refractive index of the sixth lens L6 is defined as nd6, which satisfies the following relationship: 1.53≤nd6≤1.81. This specifies the refractive index of the sixth lens L6. The refractive power within this range is beneficial for the thinning of the lens and also for the correction of aberrations.

[0068] In this embodiment, the refractive index of the seventh lens L7 is defined as nd7, which satisfies the following relationship: 1.61≤nd7≤1.67. This specifies the refractive index of the seventh lens L7. The refractive power within this range is conducive to the thinning of the lens and also allows the use of plastic materials.

[0069] In this embodiment, the focal length of the third lens L3 is defined as f3, and the focal length of the fourth lens L4 is defined as f4, satisfying the following relationship: 2.04 ≤ f3 / f4 ≤ 2.27, which specifies the ratio between the fixed focal lengths of the third lens L3 and the fourth lens L4. A ratio within this range can reduce the tolerance sensitivity of the camera lens, thereby improving image quality.

[0070] In this embodiment, the radius of curvature of the object-side surface of the seventh lens L7 is defined as R13, and the radius of curvature of the image-side surface of the seventh lens L7 is defined as R14, satisfying the following relationship: 1.06≤(R13+R14) / (R13-R14)≤1.22. This specifies the shape of the seventh lens L7. Within this range, as lenses develop towards ultra-thin and wide-angle lenses, it can effectively correct problems such as off-axis aberration and on-axis chromatic aberration. In this embodiment, the refractive index of the fifth lens L5 is nd5, and it satisfies the following relationship: 1.64≤nd5≤1.67. This specifies the refractive index of the fifth lens L5. Within this range, the refractive power is beneficial for lens thinning and also allows the use of plastic materials. Preferably, it satisfies 1.65≤nd5≤1.66.

[0071] In this embodiment, the object-side surface of the first lens L1 is convex at the paraxial position, and the image-side surface of the first lens L1 is concave at the paraxial position; in other optional embodiments, the object-side surface and the image-side surface of the first lens L1 may also be configured with other concave and convex distributions.

[0072] The central radius of curvature of the object-side surface of the first lens L1 is defined as R1, and the central radius of curvature of the image-side surface of the first lens L1 is defined as R2, satisfying the relationship: 1.43≤(R1+R2) / (R1-R2)≤1.95; this defines the shape of the first lens L1. Within this range, it can effectively correct problems such as off-axis aberration and on-axis chromatic aberration.

[0073] The thickness of the first lens L1 on the axis is defined as d1, and the total optical length of the camera optical lens 10 is TTL, satisfying the following relationship: 0.04≤d1 / TTL≤0.07, which specifies the thickness of the first lens L1. Within this range, it is beneficial to achieve ultra-thinness.

[0074] In this embodiment, the object-side surface of the second lens L2 is convex near the axis, and the image-side surface of the second lens L2 is concave near the axis; in other optional embodiments, the object-side surface and the image-side surface of the second lens L2 may also be configured with other concave and convex distributions.

[0075] The focal length of the camera optical lens 10 is defined as f, and the focal length of the second lens L2 is defined as f2, satisfying the following relationship: 3.10≤f2 / f≤3.40, which specifies the positive optical power of the second lens L2. The ratio within this range can reasonably and effectively balance the field curvature of the system, thereby improving the imaging quality.

[0076] The central radius of curvature of the object-side surface of the second lens L2 is defined as R3, and the central radius of curvature of the image-side surface of the second lens L2 is defined as R4, satisfying the relationship: -3.26≤(R3+R4) / (R3-R4)≤-2.79, which specifies the shape of the second lens L2. Within this range, it can effectively correct problems such as off-axis aberration and on-axis chromatic aberration.

[0077] The on-axis thickness of the second lens L2 is defined as d3, and the total optical length of the camera optical lens 10 is TTL, satisfying the following relationship: 0.04≤d3 / TTL≤0.06, which specifies the thickness of the second lens L2. Within this range, it is beneficial to achieve ultra-thinness.

[0078] In this embodiment, the object-side surface of the third lens L3 is convex near the axis, and the image-side surface of the third lens L3 is concave near the axis; in other optional embodiments, the object-side surface and the image-side surface of the third lens L3 may also be configured with other concave and convex distributions.

[0079] The focal length of the camera optical lens 10 is defined as f, and the focal length of the third lens L3 is defined as f3, satisfying the following relationship: 3.04≤f3 / f≤3.43; this specifies the positive optical power of the third lens L3. Satisfying this condition enables the system to have better imaging quality and lower tolerance sensitivity, thereby improving the imaging quality.

[0080] The central radius of curvature of the object-side surface of the third lens L3 is defined as R5, and the central radius of curvature of the image-side surface of the third lens L3 is defined as R6, satisfying the relationship: -1.42 ≤ (R5 + R6) / (R5 - R6) ≤ -1.28; this defines the shape of the third lens L3. Within this range, the shape of the third lens L3 can be effectively controlled. This is beneficial for the shaping of the third lens L3, as the surface curvature of the third lens L3 is very large, which can avoid poor shaping and stress generation. Therefore, it effectively corrects problems such as off-axis aberration and on-axis chromatic aberration.

[0081] The on-axis thickness of the third lens L3 is defined as d5, and the total optical length of the camera optical lens 10 is TTL, satisfying the following relationship: 0.05≤d5 / TTL≤0.06, which specifies the thickness of the third lens L3. Within this range, it is beneficial to achieve ultra-thinness.

[0082] In this embodiment, the object-side surface of the fourth lens L4 is convex near the axis, and the image-side surface of the fourth lens L4 is convex near the axis; in other optional embodiments, the object-side surface and the image-side surface of the fourth lens L4 may also be configured with other concave and convex distributions.

[0083] The focal length of the camera optical lens 10 is defined as f, and the focal length of the fourth lens L4 is defined as f4, satisfying the following relationship: 1.48 ≤ f4 / f ≤ 1.52. This specifies the positive optical power of the fourth lens L4, which is beneficial for ultra-thin design and also allows for better aberration correction.

[0084] The center radius of curvature of the object-side surface of the fourth lens L4 is defined as R7, and the center radius of curvature of the image-side surface of the fourth lens L4 is defined as R8, satisfying the relationship: 0.37≤(R7+R8) / (R7-R8)≤0.45, which specifies the shape of the fourth lens L4. This condition reasonably controls the shape of the fourth lens L4, and within the range, it can effectively correct the spherical aberration of the system.

[0085] The on-axis thickness of the fourth lens L4 is defined as d7, and the total optical length of the camera optical lens 10 is TTL, satisfying the following relationship: 0.10≤d7 / TTL≤0.12, which specifies the thickness of the fourth lens L4. Within this range, it is beneficial to achieve ultra-thinness.

[0086] In this embodiment, the object-side surface of the fifth lens L5 is concave near the axis, and the image-side surface of the fifth lens L5 is convex near the axis; in other optional embodiments, the object-side surface and the image-side surface of the fifth lens L5 may also be configured with other concave and convex distributions.

[0087] The focal length of the camera optical lens 10 is defined as f, and the focal length of the fifth lens L5 is defined as f5, satisfying the following relationship: -3.99≤f5 / f≤-3.63, which specifies the negative optical power of the fifth lens L5. Satisfying this condition can effectively make the light angle of the camera optical lens 10 flat and reduce the tolerance sensitivity.

[0088] The central radius of curvature of the object-side surface of the fifth lens L5 is defined as R9, and the central radius of curvature of the image-side surface of the fifth lens L5 is defined as R10, satisfying the following relationship: -5.59≤(R9+R10) / (R9-R10)≤-3.20, which specifies the shape of the fifth lens L5. Within this range, while achieving wide-angle and ultra-thin designs, off-axis aberrations can be effectively corrected.

[0089] The on-axis thickness of the fifth lens L5 is defined as d9, and the total optical length of the camera lens is TTL, satisfying the following relationship: 0.03≤d9 / TTL≤0.04, which specifies the thickness of the fifth lens L5. Within this range, it is beneficial to achieve ultra-thinness.

[0090] In this embodiment, the object-side surface of the sixth lens L6 is concave near the axis, and the image-side surface of the sixth lens L6 is convex near the axis; in other optional embodiments, the object-side surface and the image-side surface of the sixth lens L6 may also be configured with other concave and convex distributions.

[0091] The focal length of the camera optical lens 10 is defined as f, and the focal length of the sixth lens L6 is defined as f6, satisfying the following relationship: 0.75≤f6 / f≤0.79, which specifies the positive optical power of the sixth lens L6. A ratio within this range can reduce the tolerance sensitivity of the camera optical lens 10, thereby improving the image quality.

[0092] The central radius of curvature of the object-side surface of the sixth lens L6 is defined as R11, and the central radius of curvature of the image-side surface of the sixth lens L6 is defined as R12, satisfying the following relationship: 0.92≤(R11+R12) / (R11-R12)≤1.10, which specifies the shape of the sixth lens L6. Within this range, off-axis chromatic aberration can be corrected well.

[0093] The on-axis thickness of the sixth lens L6 is defined as d11, and the total optical length of the camera optical lens 10 is TTL, satisfying the following relationship: 0.18≤d11 / TTL≤0.20, which specifies the thickness of the sixth lens L6. Within this range, it is beneficial to achieve ultra-thinness.

[0094] In this embodiment, the object-side surface of the seventh lens L7 is convex near the axis, and the image-side surface of the seventh lens L7 is concave near the axis; in other optional embodiments, the object-side surface and the image-side surface of the seventh lens L7 may also be configured with other concave and convex distributions.

[0095] The focal length of the camera optical lens 10 is defined as f, and the focal length of the seventh lens L7 is defined as f7, satisfying the following relationship: -0.95≤f7 / f≤-0.85, which specifies the negative optical power of the seventh lens L7. The ratio within this range can reduce the tolerance sensitivity of the camera optical lens 10, and the appropriate refractive index distribution enables the system to have better imaging quality.

[0096] The on-axis thickness of the seventh lens L7 is defined as d13, and the total optical length of the camera lens is TTL, satisfying the following relationship: 0.12≤d13 / TTL≤0.14, which specifies the thickness of the seventh lens L7. Within this range, it is beneficial to achieve ultra-thinness.

[0097] The focal length of the seventh lens in the x-direction is defined as f7x, and the focal length in the y-direction is defined as f7y, satisfying the following relationships: -0.93 ≤ f7y / f ≤ -0.85, 0.99 ≤ f7y / f7x ≤ 1.01. These values ​​define the refractive power of the seventh lens L7 along the X and Y directions; an appropriate difference reduces distortion. Preferably, -0.92 ≤ f7y / f ≤ -0.88, 0.99 ≤ f7y / f7x ≤ 1.00.

[0098] In this embodiment, the image height of the camera optical lens 10 is IH, the total optical length of the camera optical lens 10 is TTL, and the following relationship is satisfied: TTL / IH≤0.85, which is beneficial for achieving ultra-thinness. Preferably, TTL / IH≤0.82 is satisfied.

[0099] In this embodiment, the field of view (FOV) of the camera optical lens 10 is greater than or equal to 117.21°, thereby achieving wide-angle viewing. Preferably, the field of view (FOV) of the camera optical lens 10 is greater than or equal to 118.40°.

[0100] In this embodiment, the aperture value FNO of the camera optical lens 10 is less than or equal to 2.03, thereby achieving a large aperture and good imaging performance. Preferably, the aperture value FNO of the camera optical lens 10 is less than or equal to 1.99.

[0101] The camera optical lens 10 has good optical performance and can meet the design requirements of large aperture, wide angle, ultra-thin and low distortion. Based on the characteristics of the camera optical lens 10, the camera optical lens 10 is particularly suitable for mobile phone camera lens assemblies and WEB camera lenses composed of high-pixel CCD, CMOS and other camera elements.

[0102] The camera optical lens 10 of the present invention will be described below with examples. The symbols described in each example are as follows. The units for focal length, on-axis distance, center radius of curvature, on-axis thickness, inversion point position, and stagnation point position are mm.

[0103] TTL: Total optical length (axial distance from the object surface of the first lens L1 to the image plane Si), in mm;

[0104] Aperture value FNO: refers to the ratio of the effective focal length to the entrance pupil diameter of a camera lens.

[0105] Preferably, the object-side and / or image-side surfaces of the lens may also be provided with inflection points and / or stagnation points to meet the requirements of high-quality imaging. Specific possible implementation schemes are described below.

[0106] Tables 1, 2, and 3 show the design data of the camera optical lens 10 according to the first embodiment of the present invention.

[0107] Table 1

[0108]

[0109]

[0110] The meanings of each symbol are as follows.

[0111] S1: First aperture;

[0112] S2: Second aperture;

[0113] S3: Third aperture;

[0114] R: Radius of curvature at the center of the optical surface;

[0115] R1: The central radius of curvature of the object side surface of the first lens L1;

[0116] R2: The central radius of curvature of the image-side surface of the first lens L1;

[0117] R3: The central radius of curvature of the object-side surface of the second lens L2;

[0118] R4: The central radius of curvature of the image-side surface of the second lens L2;

[0119] R5: The central radius of curvature of the object-side surface of the third lens L3;

[0120] R6: The central radius of curvature of the image-side surface of the third lens L3;

[0121] R7: The central radius of curvature of the object side surface of the fourth lens L4;

[0122] R8: The central radius of curvature of the image-side surface of the fourth lens L4;

[0123] R9: The central radius of curvature of the object-side surface of the fifth lens L5;

[0124] R10: The central radius of curvature of the image-side surface of the fifth lens L5;

[0125] R11: The central radius of curvature of the object-side surface of the sixth lens L6;

[0126] R12: The central radius of curvature of the image-side surface of the sixth lens L6;

[0127] R13: The central radius of curvature of the object-side surface of the seventh lens L7;

[0128] R14: The central radius of curvature of the image-side surface of the seventh lens L7;

[0129] R15: Radius of curvature of the center of the surface of the glass plate GF;

[0130] R16: Radius of curvature of the center of the image side of the glass plate GF;

[0131] d: Axial thickness of the lens, axial distance between lenses;

[0132] d0: The on-axis distance from the first aperture S1 to the object-side surface of the first lens L1;

[0133] d1: On-axis thickness of the first lens L1;

[0134] d2: The on-axis distance from the image-side surface of the first lens L1 to the object-side surface of the second lens L2;

[0135] d3: On-axis thickness of the second lens L2;

[0136] d4: The on-axis distance from the image-side surface of the second lens L2 to the object-side surface of the third lens L3;

[0137] d5: On-axis thickness of the third lens L3;

[0138] d6: The on-axis distance from the image-side surface of the third lens L3 to the object-side surface of the fourth lens L4;

[0139] d7: On-axis thickness of the fourth lens L4;

[0140] d8: The axial distance from the image-side surface of the fourth lens L4 to the object-side surface of the fifth lens L5;

[0141] d9: On-axis thickness of the fifth lens L5;

[0142] d10: The axial distance from the image-side surface of the fifth lens L5 to the object-side surface of the sixth lens L6;

[0143] d11: On-axis thickness of the sixth lens L6;

[0144] d12: The on-axis distance from the image-side surface of the sixth lens L6 to the object-side surface of the seventh lens L7;

[0145] d13: On-axis thickness of the seventh lens L7;

[0146] d14: The on-axis distance from the image side of the seventh lens L7 to the object side of the glass plate GF;

[0147] d15: Axial thickness of the glass plate GF;

[0148] nd: Refractive index of the d-line (the d-line represents green light with a wavelength of 550 nm);

[0149] nd1: The refractive index of the d-line of the first lens L1;

[0150] nd2: The refractive index of the d-line of the second lens L2;

[0151] nd3: The refractive index of the d-line of the third lens L3;

[0152] nd4: The refractive index of the d-line of the fourth lens L4;

[0153] nd5: The refractive index of the d-line of the fifth lens L5;

[0154] nd6: The refractive index of the d-line of the sixth lens L6;

[0155] nd7: The refractive index of the d-line of the seventh lens L7;

[0156] ndg: The refractive index of the d-line of the optical filter GF;

[0157] νd: Abbe number;

[0158] ν1: The Abbe number of the first lens L1;

[0159] ν2: The Abbe number of the second lens L2;

[0160] ν3: Abbe number of the third lens L3;

[0161] ν4: Abbe number of the fourth lens L4;

[0162] ν5: Abbe number of the fifth lens L5;

[0163] ν6: Abbe number of the sixth lens L6;

[0164] ν7: Abbe number of the seventh lens L7;

[0165] νg: Abbe number of the optical filter GF;

[0166] Table 2 shows the aspherical data of the first lens L1 to the sixth lens L6 in the camera optical lens 10 of the first embodiment of the present invention.

[0167] Table 2

[0168]

[0169] For convenience, the aspherical surfaces of each lens surface are as shown in the following formula (1). However, the present invention is not limited to the aspherical polynomial form represented by formula (1).

[0170] z=(cr 2 ) / {1+[1-(k+1)(c 2 r 2 )] 1 / 2}+A4r 4 +A6r 6 +A8r 8 +A10r10 +A12r 12 +A14

[0171] r 14 +A16r 16 (1)

[0172] Where k is the conic coefficient, A4, A6, A8, A10, A12, A14, and A16 are aspheric coefficients, c is the curvature at the center of the optical surface, r is the perpendicular distance between a point on the aspheric curve and the optical axis, and z is the aspheric depth (the perpendicular distance between a point on the aspheric surface at a distance r from the optical axis and a tangent plane at the vertex of the aspheric optical axis).

[0173] Table 3 shows the freeform surface data of the seventh lens L7 in the camera optical lens 10 of the first embodiment of the present invention.

[0174] Table 3

[0175]

[0176]

[0177] Where k is the conic coefficient, Bi is the aspheric coefficient, r is the perpendicular distance between a point on the freeform surface and the optical axis, x is the x-component of r, y is the y-component of r, and z is the aspheric depth (the perpendicular distance between a point on the aspheric surface at a distance r from the optical axis and the tangent plane at the vertex of the aspheric optical axis).

[0178] For convenience, each freeform surface uses the extended polynomial form shown in formula (2) above. However, the present invention is not limited to the freeform surface polynomial form represented by formula (2).

[0179] Figure 2 A schematic diagram showing the RMS spot diameter of the camera optical lens 10 according to the first embodiment is shown. Figure 2 It can be seen that the camera optical lens 10 of the first embodiment can achieve good imaging quality.

[0180] Table 13, which appears later, shows the values ​​corresponding to the various numerical values ​​in each of Examples 1, 2, 3, and 4 and the parameters specified in the conditional expressions.

[0181] As shown in Table 13, the first embodiment satisfies all the conditional expressions.

[0182] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens is 1.204 mm, the full field of view image height (diagonal direction) IH is 8.114 mm, the image height in the x direction is 6.496 mm, and the image height in the y direction is 4.861 mm. The imaging effect is optimal within this rectangular range. The field of view (FOV) in the diagonal direction is 119.60°, the field of view in the x direction is 106.10°, and the field of view in the y direction is 89.90°. The camera optical lens 10 meets the requirements of wide-angle, ultra-thin, and low distortion. Its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.

[0183] (Second Implementation)

[0184] The second implementation method is basically the same as the first implementation method, and the symbols have the same meanings as the first implementation method. Only the differences are listed below.

[0185] In this embodiment, the object-side surface of the sixth lens L6 is convex at the paraxial position.

[0186] Figure 5 The image shows the camera optical lens 20 according to the second embodiment of the present invention.

[0187] Tables 4, 5, and 6 show the design data of the camera optical lens 20 according to the second embodiment of the present invention.

[0188] Table 4

[0189]

[0190] Table 5 shows the aspherical data of the first lens L1 to the sixth lens L6 in the camera optical lens 20 of the second embodiment of the present invention.

[0191] Table 5

[0192]

[0193]

[0194] Table 6 shows the freeform surface data of the seventh lens L7 in the camera optical lens 20 of the second embodiment of the present invention.

[0195] Table 6

[0196]

[0197]

[0198] Figure 4 A schematic diagram showing the RMS spot diameter of the camera optical lens 20 according to the second embodiment is shown. Figure 4It can be seen that the camera optical lens 20 of the second embodiment can achieve good imaging quality.

[0199] As shown in Table 13, the second embodiment satisfies all the conditional expressions.

[0200] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 20 is 1.264 mm, the full field of view image height (diagonal direction) IH is 8.114 mm, the image height in the x direction is 6.496 mm, and the image height in the y direction is 4.861 mm. The imaging effect is optimal within this rectangular range. The field of view (FOV) in the diagonal direction is 120.40°, the field of view in the x direction is 106.80°, and the field of view in the y direction is 91.30°. The camera optical lens 20 satisfies the requirements of wide angle, ultra-thinness, and low distortion. Its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.

[0201] (Third Implementation)

[0202] The third implementation method is basically the same as the first implementation method, and the symbols have the same meanings as the first implementation method. Only the differences are listed below.

[0203] Tables 7, 8, and 9 show the design data of the camera optical lens 30 according to the third embodiment of the present invention.

[0204] Table 7

[0205]

[0206]

[0207] Table 8 shows the aspherical data of the first lens L1 to the sixth lens L6 in the camera optical lens 30 of the third embodiment of the present invention.

[0208] Table 8

[0209]

[0210]

[0211] Table 9 shows the freeform surface data of the seventh lens L7 in the camera optical lens 30 of the third embodiment of the present invention.

[0212] Table 9

[0213]

[0214] Figure 6 A schematic diagram showing the RMS spot diameter of the camera optical lens 30 according to the third embodiment is shown. Figure 6 It can be seen that the camera optical lens 30 of the third embodiment can achieve good imaging quality.

[0215] As shown in Table 13, the third embodiment satisfies all the conditional expressions.

[0216] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 30 is 1.203 mm, the full field of view image height (diagonal direction) IH is 8.000 mm, the image height in the x direction is 6.400 mm, and the image height in the y direction is 4.800 mm. The imaging effect is optimal within this rectangular range. The field of view (FOV) in the diagonal direction is 119.60°, the field of view in the x direction is 106.10°, and the field of view in the y direction is 90.80°. The camera optical lens 30 satisfies the requirements of wide angle, ultra-thinness, and low distortion. Its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.

[0217] (Fourth Implementation)

[0218] The fourth implementation method is basically the same as the first implementation method, and the symbols have the same meanings as the first implementation method. Only the differences are listed below.

[0219] In this embodiment, the object-side surface of the sixth lens L6 is convex at the paraxial position.

[0220] Tables 10, 11, and 12 show the design data of the camera optical lens 40 according to the fourth embodiment of the present invention.

[0221] Table 10

[0222]

[0223]

[0224] Table 11 shows the aspherical data of the first lens L1 to the sixth lens L6 in the camera optical lens 40 of the fourth embodiment of the present invention.

[0225] Table 11

[0226]

[0227] Table 12 shows the freeform surface data of the seventh lens L7 in the camera optical lens 40 of the fourth embodiment of the present invention.

[0228] Table 12

[0229]

[0230] Figure 8 A schematic diagram showing the RMS spot diameter of the camera optical lens 40 according to the fourth embodiment is shown. Figure 8 It can be seen that the camera optical lens 40 of the fourth embodiment can achieve good imaging quality.

[0231] As shown in Table 13, the fourth embodiment satisfies all the conditional expressions.

[0232] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 40 is 1.245 mm, the full field of view image height (diagonal direction) IH is 8.000 mm, the image height in the x direction is 6.400 mm, and the image height in the y direction is 4.800 mm. The imaging effect is optimal within this rectangular range. The field of view (FOV) in the diagonal direction is 120.40°, the field of view in the x direction is 106.90°, and the field of view in the y direction is 91.50°. The camera optical lens 40 meets the requirements of wide-angle, ultra-thin, and low distortion. Its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.

[0233] The values ​​in Table 13 are the parameter-related values ​​specified by the conditional expressions in each implementation.

[0234] Table 13

[0235] Parameters and conditional expressions First Implementation Method Second Implementation Method Third Implementation Method Fourth Implementation Method f1 / f -1.51 -1.39 -1.51 -1.39 n3 1.57 1.58 1.57 1.58 n6 1.86 1.54 1.86 1.56 n7 1.66 1.62 1.66 1.62 f3 / f4 2.05 2.26 2.04 2.26 f7y / f -0.925 -0.867 -0.917 -0.855 f7y / f7x 0.999 1.005 1.000 0.999 (R13+R14) / (R13-R14) 1.21 1.06 1.21 1.06 nd5 1.67 1.64 1.67 1.64 f 2.367 2.279 2.374 2.250 f1 -3.578 -3.167 -3.576 -3.120 f2 7.396 7.734 7.385 7.620 f3 7.250 7.814 7.217 7.699 f4 3.536 3.452 3.531 3.401 f5 -9.436 -8.302 -9.398 -8.179 f6 1.854 1.736 1.852 1.700 f7 -2.191 -1.976 -2.176 -1.923 FNO 1.98 1.80 1.97 1.81 TTL 6.16 6.55 6.15 6.46 IH 8.11 8.11 8.00 8.00 FOV 119.60 120.40 119.60 120.40

[0236] The meanings of each symbol are as follows.

[0237] f: The overall focal length of the camera lens;

[0238] f1: Focal length of the first lens L1;

[0239] f2: Focal length of the second lens L2;

[0240] f3: Focal length of the third lens L3;

[0241] f4: Focal length of the fourth lens L5;

[0242] f5: Focal length of the fifth lens L5;

[0243] f6: Focal length of the sixth lens L6;

[0244] f7: Focal length of the seventh lens L7;

[0245] f7x: The focal length of the seventh lens L7 along the X direction;

[0246] f7y: The focal length of the seventh lens L7 along the Y direction;

[0247] FNO: Aperture F-number;

[0248] TTL: Total optical length;

[0249] FOV: Field of view in the diagonal direction;

[0250] IH: Full field of view image height.

[0251] Based on the above embodiments, it can be seen that the camera optical lens of the present invention can have a 120-degree field of view and an optical length of less than 6.6 mm. It utilizes freeform surfaces to enhance imaging performance, thereby helping to control distortion and allowing clear imaging throughout the entire sensor area. It achieves excellent imaging performance while being ultra-thin, wide-angle, low optical distortion, and low SMIA TV distortion.

[0252] Those skilled in the art will understand that the above embodiments are specific implementations of the present invention, and in practical applications, various changes can be made in form and detail without departing from the spirit and scope of the present invention.

Claims

1. A camera optical lens characterized in that, The camera optical lens comprises seven lenses, which, from the object side to the image side, are as follows: a first lens with negative refractive power, a second lens with positive refractive power, a third lens with positive refractive power, a fourth lens with positive refractive power, a fifth lens with negative refractive power, a sixth lens with positive refractive power, and a seventh lens with negative refractive power. The object-side and image-side surfaces of the seventh lens are freeform surfaces. The object-side surface of the first lens is convex at the paraxial position, and the image-side surface of the first lens is concave at the paraxial position. The object-side surface of the second lens is concave at the paraxial position. The object-side surface of the third lens is convex at the paraxial direction, and the image-side surface of the fourth lens is convex at the paraxial direction; the object-side surface of the fifth lens is concave at the paraxial direction, and the image-side surface of the fifth lens is convex at the paraxial direction; the image-side surface of the sixth lens is convex at the paraxial direction; and the object-side surface of the seventh lens is convex at the paraxial direction, and the image-side surface of the seventh lens is concave at the paraxial direction. Wherein, the focal length of the camera optical lens is f; the focal length of the first lens is f1; the focal length of the third lens is f3; the focal length of the fourth lens is f4; the refractive index of the third lens is nd3; the refractive index of the sixth lens is nd6; and the refractive index of the seventh lens is nd7, and the following relationship is satisfied: -1.52≤f1 / f≤-1.38; 1.56≤nd3≤1.59; 1.53≤nd6≤1.81; 1.61≤nd7≤1.67; 2.04≤f3 / f4≤2.

27.

2. The camera optical lens according to claim 1, characterized in that: The object-side surface of the seventh lens has a radius of curvature of R13, and the image-side surface of the seventh lens has a radius of curvature of R14, satisfying the following relationship: 1.06≤(R13+R14) / (R13-R14)≤1.

22.

3. The camera optical lens according to claim 1, characterized in that: The refractive index of the fifth lens is nd5, and it satisfies the following relationship: 1.64≤nd5≤1.

67.

4. The camera optical lens according to claim 1, characterized in that, The center radius of curvature of the object-side surface of the first lens is R1, the center radius of curvature of the image-side surface of the first lens is R2, the axial thickness of the first lens is d1, and the total optical length of the imaging optical lens is TTL, satisfying the following relationship: 1.43≤(R1+R2) / (R1-R2)≤1.95; 0.04≤d1 / TTL≤0.

07.

5. The camera optical lens according to claim 1, wherein, The focal length of the second lens is f2, the central radius of curvature of the object-side surface of the second lens is R3, the central radius of curvature of the image-side surface of the second lens is R4, the on-axis thickness of the second lens is d3, and the total optical length of the imaging optical lens is TTL, satisfying the following relationship: 3.10≤f² / f≤3.40; -3.26≤(R3+R4) / (R3-R4)≤-2.79; 0.04≤d3 / TTL≤0.

06.

6. The camera optical lens according to claim 1, characterized in that, The focal length of the third lens is f3, the central radius of curvature of the object side of the third lens is R5, the central radius of curvature of the image side of the third lens is R6, the axial thickness of the third lens is d5, and the total optical length of the camera lens is TTL, and the following relationship is satisfied: 3.04≤f3 / f≤3.43; -1.42≤(R5+R6) / (R5-R6)≤-1.28; 0.05≤d5 / TTL≤0.

06.

7. The camera optical lens according to claim 1, wherein, The fourth lens has a focal length of f4, a central radius of curvature of the object side of the fourth lens of R7, a central radius of curvature of the image side of the fourth lens of R8, an on-axis thickness of d7, and a total optical length of TTL, satisfying the following relationship: 1.48≤f4 / f≤1.52; 0.37≤(R7+R8) / (R7-R8)≤0.45; 0.10≤d7 / TTL≤0.

12.

8. The camera optical lens according to claim 1, characterized in that, The fifth lens has a focal length of f5, a central radius of curvature of the object-side surface of the fifth lens of R9, a central radius of curvature of the image-side surface of the fifth lens of R10, an axial thickness of d9, and a total optical length of TTL, satisfying the following relationship: -3.99≤f5 / f≤-3.63; -5.59≤(R9+R10) / (R9-R10)≤-3.20; 0.03≤d9 / TTL≤0.

04.

9. The camera optical lens according to claim 1, characterized in that, The sixth lens has a focal length of f6, a central radius of curvature of R11 on the object side, a central radius of curvature of R12 on the image side, an axial thickness of d11, and a total optical length of TTL, satisfying the following relationship: 0.75≤f6 / f≤0.79; 0.92≤(R11+R12) / (R11-R12)≤1.10; 0.18≤d11 / TTL≤0.

20.

10. The camera optical lens according to claim 1, characterized in that, The seventh lens has a focal length of f7, an on-axis thickness of d13, and a total optical length of TTL, satisfying the following relationship: -0.95≤f7 / f≤-0.85; 0.12≤d13 / TTL≤0.

14.

11. The camera optical lens according to claim 1, characterized in that, The seventh lens has a focal length of f7x in the x-direction and a focal length of f7y in the y-direction, and satisfies the following relationship: -0.93≤f7y / f≤-0.85; 0.99≤f7y / f7x≤1.01.

Images