Shooting optical lens

Abstract

The invention relates to a camera shooting optical lens, which comprises eight lenses in sequence from an object side to an image side: a first lens with positive refractive power, a second lens with negative refractive power, a third lens with positive refractive power, a fourth lens with positive refractive power, a fifth lens with negative refractive power and a sixth lens, a seventh lens element with positive refractive power; and an eighth lens element with negative refractive power. The focal length of the shooting optical lens is f, the focal length of the first lens is f1, the focal length of the second lens is f2, the central curvature radius of the object side surface of the second lens is R3, the central curvature radius of the image side surface of the second lens is R4, the central curvature radius of the object side surface of the fourth lens is R7, and the central curvature radius of the image side surface of the fourth lens is R8; f2 / (R3-R4) is more than or equal to-7.10 and less than or equal to-1.50; 1.49 < = R7 / R8 < = 3.01; and 0.95 < = f1 / f < = 1.16.

Description

Technical Field

[0001] The present invention relates to the field of optical lenses, and in particular to a camera optical lens suitable for portable terminal devices such as smart phones and digital cameras, as well as camera devices such as monitors and PC lenses. Background Art

[0002] In recent years, with the rise of various smart devices, the demand for miniaturized camera optical lenses has been increasing. Due to the reduction in the pixel size of photosensitive devices and the trend of today's electronic products to have good functions and a thin and portable appearance, miniaturized camera optical lenses with good imaging quality have become the mainstream in the current market. In order to obtain better imaging quality, a multi-piece lens structure is often used. In addition, with the development of technology and the increase in the diversified needs of users, as the pixel area of ​​photosensitive devices continues to shrink and the system's requirements for imaging quality continue to increase, an eight-piece lens structure has gradually appeared in lens design. There is an urgent need for wide-angle camera lenses with excellent optical characteristics, small size, and fully corrected aberrations. Summary of the invention

[0003] In view of the above problems, the main purpose of the present invention is to provide a camera optical lens, which has good optical performance and meets the design requirements of ultra-thinness and wide angle.

[0004] To achieve the above object, the technical solution of the present invention provides a camera optical lens, the camera optical lens comprises eight lenses in total, the eight lenses are, from the object side to the image side, in order: a first lens with positive refractive power, a second lens with negative 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, a seventh lens with positive refractive power, and an eighth lens with negative refractive power;

[0005] The focal length of the camera optical lens is f, the focal length of the first lens is f1, the focal length of the second lens is f2, the central curvature radius of the object side of the second lens is R3, the central curvature radius of the image side of the second lens is R4, the central curvature radius of the object side of the fourth lens is R7, the central curvature radius of the image side of the fourth lens is R8, and the following relationship is satisfied:

[0006] -7.10≤f2 / (R3-R4)≤-1.50;

[0007] 1.49≤R7 / R8≤3.01;

[0008] 0.95≤f1 / f≤1.16.

[0009] Preferably, the focal length of the seventh lens is f7, the focal length of the eighth lens is f8, and the following relationship is satisfied:

[0010] -1.61≤f7 / f8≤-0.89.

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

[0012] 0.19≤R13 / R14≤0.46.

[0013] 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;

[0014] The central curvature radius of the object side of the first lens is R1, the central curvature radius of the image side of the first lens is R2, the axial thickness of the first lens is d1, the total optical length of the camera optical lens is TTL, and the following relationship is satisfied:

[0015] -1.65≤(R1+R2) / (R1-R2)≤-1.35;

[0016] 0.110≤d1 / TTL≤0.158.

[0017] 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;

[0018] The axial thickness of the second lens is d3, the total optical length of the camera optical lens is TTL, and the following relationship is satisfied:

[0019] -4.60≤f2 / f≤-2.48;

[0020] 2.24≤(R3+R4) / (R3-R4)≤4.43;

[0021] 0.024≤d3 / TTL≤0.034.

[0022] 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;

[0023] The focal length of the third lens is f3, the central curvature radius of the object side of the third lens is R5, the central curvature radius of the image side of the third lens is R6, the axial thickness of the third lens is d5, the total optical length of the camera optical lens is TTL, and the following relationship is satisfied:

[0024] 6.29≤f3 / f≤18.27;

[0025] -15.70≤(R5+R6) / (R5-R6)≤-5.68;

[0026] 0.025≤d5 / TTL≤0.033.

[0027] Preferably, the object side surface of the fourth lens is concave at the paraxial position, and the image side surface of the fourth lens is convex at the paraxial position;

[0028] The focal length of the fourth lens is f4, the axial thickness of the fourth lens is d7, the total optical length of the camera optical lens is TTL, and the following relationship is satisfied:

[0029] 4.01≤f4 / f≤7.91;

[0030] 1.99≤(R7+R8) / (R7-R8)≤5.01;

[0031] 0.064≤d7 / TTL≤0.076.

[0032] Preferably, the object side surface of the fifth lens is a concave surface at the paraxial position;

[0033] The focal length of the fifth lens is f5, the central curvature radius of the object side of the fifth lens is R9, the central curvature radius of the image side of the fifth lens is R10, the axial thickness of the fifth lens is d9, the total optical length of the camera optical lens is TTL, and the following relationship is satisfied:

[0034] -6.98≤f5 / f≤-3.61;

[0035] -1.02≤(R9+R10) / (R9-R10)≤-0.82;

[0036] 0.030≤d9 / TTL≤0.041.

[0037] Preferably, the object side surface of the sixth lens is convex at the paraxial position, and the image side surface of the sixth lens is concave at the paraxial position;

[0038] The focal length of the sixth lens is f6, the central curvature radius of the object side of the sixth lens is R11, the central curvature radius of the image side of the sixth lens is R12, the axial thickness of the sixth lens is d11, the total optical length of the camera optical lens is TTL, and the following relationship is satisfied:

[0039] -7.60≤f6 / f≤18.17;

[0040] -7.51≤(R11+R12) / (R11-R12)≤4.45;

[0041] 0.051≤d11 / TTL≤0.068.

[0042] 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;

[0043] The focal length of the seventh lens is f7, the central curvature radius of the object side of the seventh lens is R13, the central curvature radius of the image side of the seventh lens is R14, the axial thickness of the seventh lens is d13, the total optical length of the camera optical lens is TTL, and the following relationship is satisfied:

[0044] 0.81≤f7 / f≤1.36;

[0045] -2.64≤(R13+R14) / (R13-R14)≤-1.49;

[0046] 0.078≤d13 / TTL≤0.102.

[0047] Preferably, the object side surface of the eighth lens is concave at the paraxial position, and the image side surface of the eighth lens is concave at the paraxial position;

[0048] The focal length of the eighth lens is f8, the central curvature radius of the object side of the eighth lens is R15, the central curvature radius of the image side of the eighth lens is R16, the axial thickness of the eighth lens is d15, the total optical length of the camera optical lens is TTL, and the following relationship is satisfied:

[0049] -0.91≤f8 / f≤-0.72;

[0050] -0.38≤(R15+R16) / (R15-R16)≤-0.31;

[0051] 0.060≤d15 / TTL≤0.088.

[0052] Preferably, the first lens is made of glass.

[0053] The beneficial effects of the present invention are as follows: the camera optical lens according to the present invention has excellent optical properties, and has wide-angle and ultra-thin characteristics, and is particularly suitable for mobile phone camera lens assemblies and WEB camera lenses composed of high-pixel CCD, CMOS and other camera elements. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for describing the embodiments are 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 work, among which:

[0055] Figure 1 is a schematic structural diagram of an imaging optical lens according to a first embodiment of the present invention;

[0056] Figure 2 yes Figure 1 Schematic diagram of axial aberration of the camera optical lens shown;

[0057] Figure 3 yes Figure 1 Schematic diagram of magnification chromatic aberration of the camera optical lens shown;

[0058] Figure 4 yes Figure 1 Schematic diagram of field curvature and distortion of the camera optical lens shown;

[0059] Figure 5 is a schematic structural diagram of an imaging optical lens according to a second embodiment of the present invention;

[0060] Figure 6 yes Figure 5 Schematic diagram of axial aberration of the camera optical lens shown;

[0061] Figure 7 yes Figure 5 Schematic diagram of magnification chromatic aberration of the camera optical lens shown;

[0062] Figure 8 yes Figure 5 Schematic diagram of field curvature and distortion of the camera optical lens shown;

[0063] Fig. 9 is a schematic structural diagram of a camera optical lens according to a third embodiment of the present invention;

[0064] Fig.10 yes Fig. 9 Schematic diagram of axial aberration of the camera optical lens shown;

[0065] Fig.11 yes Fig. 9 Schematic diagram of magnification chromatic aberration of the camera optical lens shown;

[0066] Fig.12 yes Fig. 9 Schematic diagram of field curvature and distortion of the camera optical lens shown;

[0067] Fig.13is a schematic structural diagram of a camera optical lens according to a fourth embodiment of the present invention;

[0068] Fig.14 yes Fig.13 Schematic diagram of axial aberration of the camera optical lens shown;

[0069] Fig.15 yes Fig.13 Schematic diagram of magnification chromatic aberration of the camera optical lens shown;

[0070] Fig.16 yes Fig.13 Schematic diagram of field curvature and distortion of the camera optical lens shown;

[0071] Fig.17 is a schematic structural diagram of an imaging optical lens according to a fifth embodiment of the present invention;

[0072] Fig.18 yes Fig.17 Schematic diagram of axial aberration of the camera optical lens shown;

[0073] Fig.19 yes Fig.17 Schematic diagram of magnification chromatic aberration of the camera optical lens shown;

[0074] Fig. 20 yes Fig.17 Schematic diagram of field curvature and distortion of the camera optical lens shown; DETAILED DESCRIPTION

[0075] In order to make the purpose, technical scheme and advantages of the present invention clearer, the embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, it will be appreciated by those skilled in the art that in the embodiments of the present invention, many technical details are provided to enable readers to better understand the present invention. However, even without these technical details and various changes and modifications based on the following embodiments, the technical scheme claimed in the present invention can be implemented.

[0076] With reference to the accompanying drawings, the technical solution of the present invention provides an imaging optical lens 10 , 20 , 30 , 40 , 50 . Figure 1 , 5, 9, 13, and 17 show the camera optical lenses 10, 20, 30, 40, and 50 of the present invention, which include eight lenses in total. Specifically, the camera optical lenses are, from the object side to the image side, aperture S1, first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, seventh lens L7, and eighth lens L8. An optical element such as an optical filter GF may be provided between the eighth lens L8 and the image plane Si. The aperture S1 may also be provided between the first lens L1 and the second lens L2.

[0077] The first lens L1 is made of glass, the second lens L2 is made of plastic, the third lens L3 is made of plastic, the fourth lens L4 is made of plastic, the fifth lens L5 is made of plastic, the sixth lens L6 is made of plastic, the seventh lens L7 is made of plastic, and the eighth lens L8 is made of plastic. Each lens may also be made of other materials.

[0078] The focal length of the second lens L2 is defined as f2, the central curvature radius of the object side of the second lens L2 is R3, and the central curvature radius of the image side of the second lens L2 is R4, which satisfies the following relationship: -7.10≤f2 / (R3-R4)≤-1.50. Within the conditional range, it is helpful to reasonably control the surface shape of the second lens L2 and help reduce the sensitivity of the system. In addition, by reducing the difficulty of molding to improve the manufacturing yield, it can also reduce the stray light generated by the lens and improve the imaging quality of the lens.

[0079] The central curvature radius of the side surface of the fourth lens L4 is defined as R7, and the central curvature radius of the image side surface of the fourth lens L4 is defined as R8, which satisfies the following relationship: 1.49≤R7 / R8≤3.01. The shape of the fourth lens L4 is specified to be within the range of the conditional expression, which is conducive to alleviating the degree of deflection of light passing through the lens and can effectively reduce aberrations.

[0080] The focal length of the camera optical lens is defined as f, the focal length of the first lens L1 is defined as f1, and the following relationship 0.95≤f1 / f≤1.16 is satisfied, which specifies the ratio of the first lens L1 to the total focal length of the system. By reasonably allocating the optical focal length of the system, the system has better imaging quality and lower sensitivity.

[0081] When the above conditions are met, the camera optical lenses 10, 20, 30, 40, 50 have good optical performance and can meet the design requirements of large aperture, wide angle and ultra-thinness. According to the characteristics of the camera optical lenses 10, 20, 30, 40, 50, the camera optical lenses 10, 20, 30, 40, 50 are particularly suitable for mobile phone camera lens assemblies and WEB camera lenses composed of high-pixel CCD, CMOS and other camera elements.

[0082] Based on the above conditional expressions and the functions that can be achieved, the characteristics of each lens are further refined as follows.

[0083] The focal length of the seventh lens L7 is defined as f7, and the focal length of the eighth lens L8 is defined as f8, which satisfy the following relationship: -1.61≤f7 / f8≤-0.89, which specifies the ratio of the focal lengths of the seventh lens L7 and the eighth lens L8. By reasonably allocating the focal lengths of the side lenses within the conditional expression, the field curvature of the system can be effectively balanced, so that the field curvature offset of the central field of view is less than 0.02 mm.

[0084] The central curvature radius of the object side surface of the seventh lens L7 is defined as R13, and the central curvature radius of the image side surface of the seventh lens L7 is defined as R14, which satisfy the following relationship: 0.19≤R13 / R14≤0.46. The shape of the seventh lens L7 is specified, and within the range of the conditional expression, the degree of deviation of light passing through the lens can be alleviated, and the chromatic aberration can be effectively corrected, so that the chromatic aberration |LC| is less than 4.0μm.

[0085] The object-side surface of the first lens L1 is convex at the paraxial position, and the image-side surface is concave at the paraxial position. The first lens L1 has positive refractive power.

[0086] The central curvature radius of the object side surface of the first lens L1 is R1, and the central curvature radius of the image side surface of the first lens L1 is R2, which satisfies the following relationship: -1.65≤(R1+R2) / (R1-R2)≤-1.35, which specifies the shape of the first lens L1 and is beneficial to the molding of the first lens L1. Within the range specified by the conditional expression, the degree of deflection of light passing through the lens can be alleviated, thereby effectively reducing aberrations.

[0087] The axial thickness of the first lens L1 is d1, and the total optical length of the camera optical lens 10 is TTL, which satisfies the following relationship: 0.110≤d1 / TTL≤0.158. Within the range of the conditional expression, it is conducive to achieving ultra-thinness.

[0088] The object-side surface of the second lens L2 is convex at the paraxial position, and the image-side surface is concave at the paraxial position. The second lens L2 has negative refractive power.

[0089] 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: -4.60≤f2 / f≤-2.48. By controlling the negative focal length of the second lens L2 within a reasonable range, it is beneficial to correct the aberration of the optical system.

[0090] The central curvature radius of the object side surface of the second lens L2 is R3, and the central curvature radius of the image side surface of the second lens L2 is R4, which satisfies the following relationship: 2.24≤(R3+R4) / (R3-R4)≤4.43, which specifies the shape of the second lens L2. When it is within the range, as the lens develops towards ultra-thin and wide-angle, it is beneficial to correct the axial chromatic aberration problem.

[0091] The axial thickness of the second lens L2 is d3, and the total optical length of the camera optical lens 10 is TTL, which satisfies the following relationship: 0.024≤d3 / TTL≤0.034. Within the range of the conditional expression, it is conducive to achieving ultra-thinness.

[0092] The object side surface of the third lens L3 is convex at the paraxial position, and the image side surface is concave at the paraxial position, and the third lens L3 has positive refractive power. The object side surface and the image side surface of the third lens L3 can also be set to other concave and convex distributions.

[0093] 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, which satisfy the following relationship: 6.29≤f3 / f≤18.27. Through the reasonable distribution of optical power, the system has better imaging quality and lower sensitivity.

[0094] The central curvature radius of the object side surface of the third lens L3 is R5, and the central curvature radius of the image side surface of the third lens L3 is R6, which satisfies the following relationship: -15.70≤(R5+R6) / (R5-R6)≤-5.68, which specifies the shape of the third lens L3 and is beneficial to the molding of the third lens L3. Within the range specified by the conditional formula, the degree of deflection of light passing through the lens can be alleviated, thereby effectively reducing aberrations.

[0095] The axial thickness of the third lens L3 is d5, and the total optical length of the camera optical lens 10 is TTL, which satisfies the following relationship: 0.025≤d5 / TTL≤0.033. Within the range of the conditional expression, it is conducive to achieving ultra-thinness.

[0096] The object-side surface of the fourth lens L4 is concave at the paraxial position, and the image-side surface is convex at the paraxial position. The fourth lens L4 has positive refractive power.

[0097] 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, which satisfy the following relationship: 4.01≤f4 / f≤7.91. Through the reasonable distribution of optical focal length, the system has better imaging quality and lower sensitivity.

[0098] The central curvature radius of the object side surface of the fourth lens L4 is R7, and the central curvature radius of the image side surface of the fourth lens L4 is R8, and the following relationship is satisfied: 1.99≤(R7+R8) / (R7-R8)≤5.01, which specifies the shape of the fourth lens L4. When within the range, with the development of ultra-thin and wide-angle, it is beneficial to correct the aberration of off-axis picture angles and other problems.

[0099] The axial thickness of the fourth lens L4 is d7, and the total optical length of the camera optical lens 10 is TTL, which satisfies the following relationship: 0.064≤d7 / TTL≤0.076. Within the range of the conditional expression, it is conducive to achieving ultra-thinness.

[0100] The object-side surface of the fifth lens L5 is concave at the paraxial position, and the image-side surface is concave or convex at the paraxial position. The fifth lens L5 has negative refractive power.

[0101] 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, which satisfy the following relationship: -6.98≤f5 / f≤-3.61. The limitation on the fifth lens L5 can effectively make the light angle of the camera optical lens 10 smooth and reduce the tolerance sensitivity.

[0102] The central curvature radius of the object side surface of the fifth lens L5 is R9, the central curvature radius of the image side surface of the fifth lens L5 is R10, and the following relationship is satisfied: -1.02≤(R9+R10) / (R9-R10)≤-0.82, which specifies the shape of the fifth lens L5. When it is within the range, with the development of ultra-thin and wide-angle, it is beneficial to correct the aberration of off-axis picture angles and other problems.

[0103] The axial thickness of the fifth lens L5 is d9, and the total optical length of the camera optical lens 10 is TTL, which satisfies the following relationship: 0.030≤d9 / TTL≤0.041. Within the range of the conditional expression, it is conducive to achieving ultra-thinness.

[0104] The object-side surface of the sixth lens L6 is convex at the paraxial position, and the image-side surface is concave at the paraxial position. The sixth lens L6 has negative refractive power or positive refractive power.

[0105] 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, which satisfy the following relationship: -7.60≤f6 / f≤18.17. Through the reasonable allocation of optical focal length, the system has better imaging quality and lower sensitivity.

[0106] The central curvature radius of the object side surface of the sixth lens L6 is R11, the central curvature radius of the image side surface of the sixth lens L6 is R12, and the following relationship is satisfied: -7.51≤(R11+R12) / (R11-R12)≤4.45, which specifies the shape of the sixth lens L6. When within the condition range, with the development of ultra-thin and wide-angle lenses, it is beneficial to correct the aberration of off-axis picture angles and other problems.

[0107] The axial thickness of the sixth lens L6 is d11, and the total optical length of the camera optical lens 10 is TTL, which satisfies the following relationship: 0.051≤d11 / TTL≤0.068. Within the range of the conditional expression, it is conducive to achieving ultra-thinness.

[0108] The object-side surface of the seventh lens L7 is convex at the paraxial position, and the image-side surface is concave at the paraxial position. The seventh lens L7 has positive refractive power.

[0109] 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, which satisfy the following relationship: 0.81≤f7 / f≤1.36. Through the reasonable distribution of optical power, the system has better imaging quality and lower sensitivity.

[0110] The central curvature radius of the object side surface of the seventh lens L7 is R13, and the central curvature radius of the image side surface of the seventh lens L7 is R14, which satisfies the following relationship: -2.64≤(R13+R14) / (R13-R14)≤-1.49, which specifies the shape of the seventh lens L7. When within the condition range, with the development of ultra-thin and wide-angle, it is beneficial to correct the aberration of off-axis picture angle and other problems.

[0111] The axial thickness of the seventh lens L7 is d13, and the total optical length of the camera optical lens 10 is TTL, which satisfies the following relationship: 0.078≤d13 / TTL≤0.102. Within the range of the conditional expression, it is conducive to achieving ultra-thinness.

[0112] The object-side surface of the eighth lens L8 is concave at the paraxial position, the image-side surface is concave at the paraxial position, and the eighth lens L8 has negative refractive power.

[0113] The focal length of the camera optical lens 10 is defined as f, and the focal length of the eighth lens L8 is defined as f8, which satisfy the following relationship: -0.91≤f8 / f≤-0.72. Through the reasonable distribution of optical power, the system has better imaging quality and lower sensitivity.

[0114] The central curvature radius of the object side surface of the eighth lens L8 is R15, and the central curvature radius of the image side surface of the eighth lens L8 is R16, which satisfies the following relationship: -0.38≤(R15+R16) / (R15-R16)≤-0.31, which specifies the shape of the eighth lens. When within the condition range, with the development of ultra-thin and wide-angle, it is beneficial to correct the aberration of off-axis picture angle and other problems.

[0115] The axial thickness of the eighth lens L8 is d15, and the total optical length of the camera optical lens 10 is TTL, which satisfies the following relationship: 0.060≤d15 / TTL≤0.088. Within the range of the conditional expression, it is conducive to achieving ultra-thinness.

[0116] The image height of 1.0 field of view 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≤1.32, which is conducive to achieving ultra-thinness.

[0117] The field of view angle FOV of the camera optical lens 10 is greater than or equal to 78.70°, thereby achieving a wide angle.

[0118] The aperture value FNO of the camera optical lens 10 is less than or equal to 1.73, thereby achieving a large aperture and good imaging performance of the camera optical lens.

[0119] The following examples are used to illustrate the imaging optical lens of the present invention. The symbols recorded in each example are as follows: The focal length, axial distance, central curvature radius, and axial thickness are in units of mm.

[0120] TTL: total optical length (the axial distance from the object side of the first lens L1 to the image surface Si), in mm;

[0121] Aperture value FNO: refers to the ratio of the effective focal length of the camera optical lens to the entrance pupil diameter.

[0122] 1.0 Image height IH of the field of view: the height of the field of view corresponding to the effective pixel of the sensor (that is, half of the diagonal length of the effective pixel area of ​​the sensor);

[0123] 1.0 Field of view FOV: the field of view angle corresponding to the effective pixels of the sensor;

[0124] Image height IHm of MIC field of view: the field of view height expanded beyond 1.0 to prevent assembly deviation;

[0125] Field of view angle FOVm of MIC field of view: the field of view angle corresponding to the image height of MIC field of view.

[0126] Preferably, an inflection point and / or a stagnation point may be provided on the object side and / or the image side of the lens to meet high-quality imaging requirements.

[0127] Next, the technical solution of the present invention is specifically described with five implementation modes.

[0128] (First Embodiment)

[0129] Table 1 and Table 2 show design data of the imaging optical lens 10 according to the first embodiment of the present invention.

[0130]

Table 1

[0131]

[0132]

[0133] The meaning of each symbol is as follows.

[0134] S1: aperture;

[0135] R: radius of curvature at the center of the optical surface;

[0136] R1: the central curvature radius of the object side of the first lens L1;

[0137] R2: the central curvature radius of the image side surface of the first lens L1;

[0138] R3: the central curvature radius of the object side surface of the second lens L2;

[0139] R4: the central curvature radius of the image side surface of the second lens L2;

[0140] R5: the central curvature radius of the object side surface of the third lens L3;

[0141] R6: the central curvature radius of the image side surface of the third lens L3;

[0142] R7: the central curvature radius of the object side surface of the fourth lens L4;

[0143] R8: the central curvature radius of the image side surface of the fourth lens L4;

[0144] R9: the central curvature radius of the object side surface of the fifth lens L5;

[0145] R10: the central curvature radius of the image side surface of the fifth lens L5; R11: the central curvature radius of the object side surface of the sixth lens L6; R12: the central curvature radius of the image side surface of the sixth lens L6; R13: the central curvature radius of the object side surface of the seventh lens L7; R14: the central curvature radius of the image side surface of the seventh lens L7; R15: the central curvature radius of the object side surface of the eighth lens L8; R16: the central curvature radius of the image side surface of the eighth lens L8; R17: the central curvature radius of the object side surface of the optical filter GF;

[0146] R18: The central curvature radius of the image side of the optical filter GF;

[0147] d: the axial thickness of the lens, the axial distance between lenses;

[0148] d0: the axial distance from the aperture S1 to the object side of the first lens L1;

[0149] d1: axial thickness of the first lens L1;

[0150] d2: the axial distance from the image side surface of the first lens L1 to the object side surface of the second lens L2;

[0151] d3: axial thickness of the second lens L2;

[0152] d4: the axial distance from the image side surface of the second lens L2 to the object side surface of the third lens L3;

[0153] d5: axial thickness of the third lens L3;

[0154] d6: the axial distance from the image side surface of the third lens L3 to the object side surface of the fourth lens L4;

[0155] d7: axial thickness of the fourth lens L4;

[0156] d8: the axial distance from the image side surface of the fourth lens L4 to the object side surface of the fifth lens L5;

[0157] d9: axial thickness of the fifth lens L5;

[0158] d10: the axial distance from the image side surface of the fifth lens L5 to the object side surface of the sixth lens L6;

[0159] d11: axial thickness of the sixth lens L6;

[0160] d12: axial distance from the image side surface of the sixth lens L6 to the object side surface of the seventh lens L7;

[0161] d13: axial thickness of the seventh lens L7;

[0162] d14: axial distance from the image side surface of the seventh lens L7 to the object side surface of the eighth lens L8;

[0163] d15: axial thickness of the eighth lens L8;

[0164] d16: the axial distance between the image side surface of the eighth lens L8 and the object side surface of the optical filter GF;

[0165] d17: axial thickness of the optical filter GF;

[0166] d18: the axial distance from the image side of the optical filter GF to the image plane Si;

[0167] nd: refractive index of d-line (d-line is green light with a wavelength of 550nm);

[0168] nd1: refractive index of the first lens L1 at the d-line;

[0169] nd2: refractive index of the d-line of the second lens L2;

[0170] nd3: refractive index of the third lens L3 at the d-line;

[0171] nd4: refractive index of the d-line of the fourth lens L4;

[0172] nd5: the refractive index of the fifth lens L5 at the d-line;

[0173] nd6: the refractive index of the d-line of the sixth lens L6;

[0174] nd7: the refractive index of the d-line of the seventh lens L7;

[0175] nd8: the refractive index of the d-line of the eighth lens L8;

[0176] ndg: refractive index of the d-line of the optical filter GF;

[0177] vd: Abbe number;

[0178] v1: Abbe number of the first lens L1;

[0179] v2: Abbe number of the second lens L2;

[0180] v3: Abbe number of the third lens L3;

[0181] v4: Abbe number of the fourth lens L4;

[0182] v5: Abbe number of the fifth lens L5;

[0183] v6: Abbe number of sixth lens L6;

[0184] v7: Abbe number of the seventh lens L7;

[0185] v8: Abbe number of the eighth lens L8;

[0186] vg: Abbe number of the optical filter GF.

[0187] Table 2 shows aspherical surface data of each lens in the imaging optical lens 10 according to the first embodiment of the present invention.

[0188]

Table 2

[0189]

[0190]

[0191] For convenience, the aspheric surface of each lens surface uses the aspheric surface shown in the following formula (1). However, the present invention is not limited to the aspheric surface polynomial form represented by the formula (1).

[0192] z=(cr 2 ) / {1+[1-(k+1)(c 2 r 2 )] 1 / 2}+A4r 4 +A6r 6 +A8r 8 +A10r 10 +A12r 12 +A14r

[0193] 14 +A16r 16 +A18r 18 +A20r 20 +A22r 22 +A24r 24 +A26r 26 +A28r 28 +A30r 30 (1)

[0194] Where, k is the cone coefficient, A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, A30 are aspheric coefficients, c is the curvature at the center of the optical surface, r is the vertical distance between the point on the aspheric curve and the optical axis, and z is the aspheric depth (the vertical distance between the point on the aspheric surface that is r away from the optical axis and the tangent plane tangent to the vertex on the aspheric optical axis).

[0195] Figure 2 , Figure 3 Schematic diagrams showing axial aberration and chromatic aberration of magnification of light with wavelengths of 656 nm, 588 nm, 546 nm, 486 nm, and 436 nm after passing through the imaging optical lens 10 of the first embodiment are shown respectively. Figure 4 FIG. 4 shows a schematic diagram of field curvature and distortion of light having a wavelength of 546 nm after passing through the camera optical lens 10 of the first embodiment. Figure 4 The field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0196] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 10 is 5.115 mm, the image height IH of the 1.0 field of view is 8.165 mm, the field angle FOV of the 1.0 field of view is 85.48°, the image height IHm of the MIC field of view is 8.415 mm, and the field angle FOVm of the MIC field of view is 87.91°. The camera optical lens 10 meets the design requirements of large aperture, wide angle, and ultra-thinness, its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.

[0197] (Second Embodiment)

[0198] The meanings of the symbols in the second embodiment are the same as those in the first embodiment.

[0199] Figure 5 FIG. 2 shows an imaging optical lens 20 according to a second embodiment of the present invention.

[0200] Tables 3 and 4 show design data of the imaging optical lens 20 according to the second embodiment of the present invention.

[0201]

Table 3

[0202]

[0203] Table 4 shows aspherical surface data of each lens in the imaging optical lens 20 according to the second embodiment of the present invention.

[0204]

Table 4

[0205]

[0206]

[0207]

[0208] Figure 6 , Figure 7 Schematic diagrams showing axial aberration and chromatic aberration of magnification of light with wavelengths of 656 nm, 588 nm, 546 nm, 486 nm, and 436 nm after passing through the imaging optical lens 20 of the second embodiment are shown respectively. Figure 8 FIG. 4 is a schematic diagram showing the field curvature and distortion of light with a wavelength of 546 nm after passing through the imaging optical lens 20 of the second embodiment. Figure 8 The field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0209] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 20 is 4.953 mm, the image height IH of the 1.0 field of view is 8.165 mm, the field angle FOV of the 1.0 field of view is 86.70°, the image height IHm of the MIC field of view is 8.415 mm, and the field angle FOVm of the MIC field of view is 88.85°. The camera optical lens 20 meets the design requirements of large aperture, wide angle, and ultra-thinness, its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.

[0210] (Third Embodiment)

[0211] The meanings of the symbols in the third embodiment are the same as those in the first embodiment.

[0212] The difference from the first embodiment is that the image-side surface of the fifth lens L5 is a convex surface at the paraxial position.

[0213] Fig. 9 FIG. 1 shows an imaging optical lens 30 according to a third embodiment of the present invention.

[0214] Tables 5 and 6 show design data of the imaging optical lens 30 according to the third embodiment of the present invention.

[0215]

Table 5

[0216]

[0217]

[0218] Table 6 shows aspherical surface data of each lens in the imaging optical lens 30 according to the third embodiment of the present invention.

[0219]

Table 6

[0220]

[0221]

[0222] Fig.10 , Fig.11 Schematic diagrams showing axial aberration and chromatic aberration of magnification of light with wavelengths of 656 nm, 588 nm, 546 nm, 486 nm, and 436 nm after passing through the imaging optical lens 30 of the third embodiment are shown respectively. Fig.12 FIG. 4 is a schematic diagram showing the field curvature and distortion of light with a wavelength of 546 nm after passing through the imaging optical lens 30 of the third embodiment. Fig.12 The field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0223] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 30 is 5.299 mm, the image height IH of the 1.0 field of view is 8.165 mm, the field angle FOV of the 1.0 field of view is 78.70°, the image height IHm of the MIC field of view is 8.415 mm, and the field angle FOVm of the MIC field of view is 81.11°. The camera optical lens 30 meets the design requirements of large aperture, wide angle, and ultra-thinness, its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.

[0224] (Fourth Embodiment)

[0225] The meanings of symbols in the fourth embodiment are the same as those in the first embodiment.

[0226] The difference from the first embodiment is that the sixth lens L6 has positive refractive power.

[0227] Fig.13 FIG. 4 shows an imaging optical lens 40 according to a fourth embodiment of the present invention.

[0228] Tables 7 and 8 show design data of the imaging optical lens 40 according to the fourth embodiment of the present invention.

[0229]

Table 7

[0230]

[0231] Table 8 shows aspherical surface data of each lens in the imaging optical lens 40 according to the fourth embodiment of the present invention.

[0232]

Table 8

[0233]

[0234]

[0235]

[0236] Fig.14 , Fig.15 Schematic diagrams showing axial aberration and chromatic aberration of magnification of light with wavelengths of 656 nm, 588 nm, 546 nm, 486 nm, and 436 nm after passing through the imaging optical lens 40 of the fourth embodiment are shown respectively. Fig.16 FIG. 4 is a schematic diagram showing the field curvature and distortion of light with a wavelength of 546 nm after passing through the imaging optical lens 40 of the fourth embodiment. Fig.16 The field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0237] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 40 is 5.038 mm, the image height IH of the 1.0 field of view is 8.165 mm, the field angle FOV of the 1.0 field of view is 82.01°, the image height IHm of the MIC field of view is 8.415 mm, and the field angle FOVm of the MIC field of view is 84.16°. The camera optical lens 40 meets the design requirements of large aperture, wide angle, and ultra-thinness, its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.

[0238] (Fifth Embodiment)

[0239] The meanings of symbols in the fifth embodiment are the same as those in the first embodiment.

[0240] The difference from the first embodiment is that the image-side surface of the fifth lens L5 is a convex surface at the paraxial position.

[0241] Fig.17 FIG. 4 shows an imaging optical lens 50 according to a fourth embodiment of the present invention.

[0242] Tables 9 and 10 show design data of the imaging optical lens 50 according to the fourth embodiment of the present invention.

[0243]

Table 9

[0244]

[0245]

[0246] Table 10 shows aspherical surface data of each lens in the imaging optical lens 40 according to the fourth embodiment of the present invention.

[0247]

Table 10

[0248]

[0249]

[0250] Fig.18 , Fig.19 Schematic diagrams showing axial aberration and chromatic aberration of magnification of light with wavelengths of 656 nm, 588 nm, 546 nm, 486 nm, and 436 nm after passing through the imaging optical lens 50 of the fifth embodiment are shown respectively. Fig. 20 FIG. 4 is a schematic diagram showing the field curvature and distortion of light with a wavelength of 546 nm after passing through the imaging optical lens 50 of the fifth embodiment. Fig. 20 The field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0251] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 50 is 5.023 mm, the image height IH of the 1.0 field of view is 8.165 mm, the field angle FOV of the 1.0 field of view is 81.98°, the image height IHm of the MIC field of view is 8.415 mm, and the field angle FOVm of the MIC field of view is 84.28°. The camera optical lens 50 meets the design requirements of large aperture, wide angle, and ultra-thinness, its on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.

[0252] Table 11 that follows shows the values ​​corresponding to the parameters specified in the conditional expressions and various numerical values ​​in each of the first, second, third, fourth, and fifth embodiments.

[0253]

Table 11

[0254] Parameters and Conditionals Implementation Method 1 Implementation Method 2 Implementation 3 Implementation 4 Implementation method 5 f2 / (R3-R4) -3.183 -7.000 -1.500 -2.672 -1.806 R7 / R8 2.175 1.500 1.565 3.000 1.766 f1 / f 1.039 1.150 0.950 1.052 1.018 f 8.594 8.321 8.902 8.464 8.438 f1 8.927 9.570 8.457 8.906 8.592 f2 -28.141 -37.744 -22.150 -26.985 -23.438 f3 72.240 124.661 56.051 152.654 55.699 f4 42.657 60.352 70.037 34.010 52.042 f5 -32.191 -57.382 -33.794 -30.570 -35.066 f6 -64.865 -39.836 -47.043 152.767 -18.009 f7 8.479 8.442 8.604 11.376 6.867 f8 -6.366 -6.537 -6.431 -7.110 -7.630 FNO 1.680 1.680 1.680 1.680 1.680 TTL 10.402 10.656 10.760 10.667 10.642 IH 8.165 8.165 8.165 8.165 8.165 FOV 85.48° 86.70° 78.70° 82.01° 81.98°

[0255] Those skilled in the art will appreciate that the above-mentioned embodiments are specific embodiments for implementing the present invention, and in actual applications, various changes may be made thereto 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 eight lenses in total, and the eight lenses are, in order from the object side to the image side: a first lens with positive refractive power, a second lens with negative 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, a seventh lens with positive refractive power, and an eighth lens with negative refractive power; The focal length of the camera optical lens is f, the focal length of the first lens is f1, the focal length of the second lens is f2, the central curvature radius of the object side of the second lens is R3, the central curvature radius of the image side of the second lens is R4, the central curvature radius of the object side of the fourth lens is R7, the central curvature radius of the image side of the fourth lens is R8, and the following relationship is satisfied: -7.10≤f2 / (R3-R4)≤-1.50; 1.49≤R7 / R8≤3.01; 0.95≤f1 / f≤1.

16.

2. The imaging optical lens according to claim 1, characterized in that: The focal length of the seventh lens is f7, the focal length of the eighth lens is f8, and the following relationship is satisfied: -1.61≤f7 / f8≤-0.

89.

3. The imaging optical lens according to claim 1, characterized in that: The central curvature radius of the object side of the seventh lens is R13, the central curvature radius of the image side of the seventh lens is R14, and the following relationship is satisfied: 0.19≤R13 / R14≤0.

46.

4. The imaging optical lens according to claim 1, wherein: The object side surface of the first lens is convex at the paraxial position, and the image side surface of the first lens is concave at the paraxial position; The central curvature radius of the object side of the first lens is R1, the central curvature radius of the image side of the first lens is R2, the axial thickness of the first lens is d1, the total optical length of the camera optical lens is TTL, and the following relationship is satisfied: -1.65≤(R1+R2) / (R1-R2)≤-1.35; 0.110≤d1 / TTL≤0.

158.

5. The imaging optical lens according to claim 1, wherein: 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; The axial thickness of the second lens is d3, the total optical length of the camera optical lens is TTL, and the following relationship is satisfied: -4.60≤f2 / f≤-2.48; 2.24≤(R3+R4) / (R3-R4)≤4.43; 0.024≤d3 / TTL≤0.

034.

6. The imaging optical lens according to claim 1, characterized in that: 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; The focal length of the third lens is f3, the central curvature radius of the object side of the third lens is R5, the central curvature radius of the image side of the third lens is R6, the axial thickness of the third lens is d5, the total optical length of the camera optical lens is TTL, and the following relationship is satisfied: 6.29≤f3 / f≤18.27; -15.70≤(R5+R6) / (R5-R6)≤-5.68; 0.025≤d5 / TTL≤0.

033.

7. The imaging optical lens according to claim 1, characterized in that: The object side surface of the fourth lens is concave at the paraxial position, and the image side surface of the fourth lens is convex at the paraxial position; The focal length of the fourth lens is f4, the axial thickness of the fourth lens is d7, the total optical length of the camera optical lens is TTL, and the following relationship is satisfied: 4.01≤f4 / f≤7.91; 1.99≤(R7+R8) / (R7-R8)≤5.01; 0.064≤d7 / TTL≤0.

076.

8. The imaging optical lens according to claim 1, wherein: The object side surface of the fifth lens is concave at the paraxial position; The focal length of the fifth lens is f5, the central curvature radius of the object side of the fifth lens is R9, the central curvature radius of the image side of the fifth lens is R10, the axial thickness of the fifth lens is d9, the total optical length of the camera optical lens is TTL, and the following relationship is satisfied: -6.98≤f5 / f≤-3.61; -1.02≤(R9+R10) / (R9-R10)≤-0.82; 0.030≤d9 / TTL≤0.

041.

9. The imaging optical lens according to claim 1, characterized in that: The object side surface of the sixth lens is convex at the paraxial position, and the image side surface of the sixth lens is concave at the paraxial position; The focal length of the sixth lens is f6, the central curvature radius of the object side of the sixth lens is R11, the central curvature radius of the image side of the sixth lens is R12, the axial thickness of the sixth lens is d11, the total optical length of the camera optical lens is TTL, and the following relationship is satisfied: -7.60≤f6 / f≤18.17; -7.51≤(R11+R12) / (R11-R12)≤4.45; 0.051≤d11 / TTL≤0.

068.

10. The imaging optical lens according to claim 1, characterized in that: 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; The focal length of the seventh lens is f7, the central curvature radius of the object side of the seventh lens is R13, the central curvature radius of the image side of the seventh lens is R14, the axial thickness of the seventh lens is d13, the total optical length of the camera optical lens is TTL, and the following relationship is satisfied: 0.81≤f7 / f≤1.36; -2.64≤(R13+R14) / (R13-R14)≤-1.49; 0.078≤d13 / TTL≤0.

102.

11. The imaging optical lens according to claim 1, characterized in that: The object side surface of the eighth lens is concave at the paraxial position, and the image side surface of the eighth lens is concave at the paraxial position; The focal length of the eighth lens is f8, the central curvature radius of the object side of the eighth lens is R15, the central curvature radius of the image side of the eighth lens is R16, the axial thickness of the eighth lens is d15, the total optical length of the camera optical lens is TTL, and the following relationship is satisfied: -0.91≤f8 / f≤-0.72; -0.38≤(R15+R16) / (R15-R16)≤-0.31; 0.060≤d15 / TTL≤0.

088.

12. The imaging optical lens according to claim 1, characterized in that: The first lens is made of glass.

Images