Shooting optical lens

Abstract

The invention relates to the field of optical lenses, and discloses a camera shooting optical lens, which sequentially comprises a first lens with positive refractive power, a second lens with negative refractive power, a third lens with positive refractive power and a fourth lens with negative refractive power from an object side to an image side, the following relational expressions are satisfied: 0.65 < = f1 / f < = 0.85; -1.50 < = (f3-f4) / f2 < =-0.80; 0.20 < = (R3 + R4) / f2 < = 0.80; 2.00 < = d1 / d3 < = 7.00; -3.50 < = f234 / (d3 + d5 + d7) < =-2.50.

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, a four-piece lens structure has gradually appeared in lens design. There is an urgent need for camera optical lenses with good optical performance. Summary of the invention

[0003] In view of the above problems, an object of the present invention is to provide a camera optical lens having good optical performance design requirements.

[0004] In order to solve the above technical problems, an embodiment of the present invention provides a camera optical lens, which comprises, 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, and a fourth 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 focal length of the third lens is f3, the focal length of the fourth lens is f4, the combined focal length of the second lens, the third lens and the fourth lens is f234, 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 axial thickness of the first lens is d1, the axial thickness of the second lens is d3, the axial thickness of the third lens is d5, the axial thickness of the fourth lens is d7, and the following relationship is satisfied:

[0006] 0.65≤f1 / f≤0.85;

[0007] -1.50≤(f3-f4) / f2≤-0.80;

[0008] 0.20≤(R3+R4) / f2≤0.80;

[0009] 2.00≤d1 / d3≤7.00;

[0010] -3.50≤f234 / (d3+d5+d7)≤-2.50.

[0011] Preferably, 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, and the following relationship is satisfied:

[0012] 2.00≤(R5+R6) / (R5-R6)≤3.00.

[0013] Preferably, the sum of the axial thicknesses of the first lens, the second lens, the third lens and the fourth lens is ∑Ti, the total optical length of the camera optical lens is TTL, and the following relationship is satisfied:

[0014] 0.50≤∑Ti / TTL≤0.70.

[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 convex at the paraxial position; the axial thickness of the first lens is d1, the central curvature radius of the object side surface of the first lens is R1, the central curvature radius of the image side surface of the first lens is R2, the total optical length of the camera optical lens is TTL, and the following relationship is satisfied:

[0016] -1.41≤(R1+R2) / (R1-R2)≤-0.28;

[0017] 1.63≤d1 / TTL≤6.17.

[0018] Preferably, the object side surface of the second lens is concave at the paraxial position, and the image side surface of the second lens is concave at the paraxial position; the total optical length of the camera optical lens is TTL, and satisfies the following relationship:

[0019] -4.23≤f2 / f≤-0.84;

[0020] 0.04≤(R3+R4) / (R3-R4)≤0.42;

[0021] 0.30≤d3 / TTL≤2.79.

[0022] Preferably, the object side surface of the third lens is concave at the paraxial position, and the image side surface of the third lens is convex at the paraxial position; the total optical length of the camera optical lens is TTL, and satisfies the following relationship:

[0023] 0.39≤f3 / f≤1.51;

[0024] 1.83≤d5 / TTL≤8.32.

[0025] 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 concave at the paraxial position; the central curvature radius of the object side surface of the fourth lens is R7, the central curvature radius of the image side surface of the fourth lens is R8, the total optical length of the camera optical lens is TTL, and the following relationship is satisfied:

[0026] -1.76≤f4 / f≤-0.48;

[0027] 0.97≤(R7+R8) / (R7-R8)≤3.63;

[0028] 1.10≤d7 / TTL≤4.76.

[0029] Preferably, the camera optical lens aperture value FNO is less than or equal to 2.96.

[0030] Preferably, the total optical length of the camera optical lens is TTL, the image height of the camera optical lens is IH, and the following relationship is satisfied:

[0031] TTL / IH≤1.67.

[0032] Preferably, the combined focal length of the first lens and the second lens is f12, and satisfies the following relationship:

[0033] 0.52≤f12 / f≤1.82.

[0034] The beneficial effect of the present invention is that the camera optical lens according to the present invention has excellent optical characteristics and good optical performance, 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

[0035] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for describing the embodiments. 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:

[0036] Figure 1 is a schematic structural diagram of an imaging optical lens according to a first embodiment of the present invention;

[0037] Figure 2 yes Figure 1 Schematic diagram of axial aberration of the camera optical lens shown;

[0038] Figure 3 yes Figure 1 Schematic diagram of magnification chromatic aberration of the camera optical lens shown;

[0039] Figure 4 yes Figure 1 Schematic diagram of field curvature and distortion of the camera optical lens shown;

[0040] Figure 5 is a schematic structural diagram of an imaging optical lens according to a second embodiment of the present invention;

[0041] Figure 6 yes Figure 5 Schematic diagram of axial aberration of the camera optical lens shown;

[0042] Figure 7 yes Figure 5 Schematic diagram of magnification chromatic aberration of the camera optical lens shown;

[0043] Figure 8 yes Figure 5 Schematic diagram of field curvature and distortion of the camera optical lens shown;

[0044] Fig. 9 is a schematic structural diagram of a camera optical lens according to a third embodiment of the present invention;

[0045] Fig.10 yes Fig. 9 Schematic diagram of axial aberration of the camera optical lens shown;

[0046] Fig.11 yes Fig. 9 Schematic diagram of magnification chromatic aberration of the camera optical lens shown;

[0047] Fig.12 yes Fig. 9 Schematic diagram of field curvature and distortion of the camera optical lens shown;

[0048] Fig.13 is a schematic structural diagram of a camera optical lens according to a fourth embodiment of the present invention;

[0049] Fig.14 yes Fig.13 Schematic diagram of axial aberration of the camera optical lens shown;

[0050] Fig.15 yes Fig.13 Schematic diagram of magnification chromatic aberration of the camera optical lens shown;

[0051] Fig.16 yes Fig.13 Schematic diagram of field curvature and distortion of the camera optical lens shown;

[0052] Fig.17 is a schematic structural diagram of a camera optical lens according to a comparative embodiment of the present invention;

[0053] Fig.18 yes Fig.17 Schematic diagram of axial aberration of the camera optical lens shown;

[0054] Fig.19 yes Fig.17 Schematic diagram of magnification chromatic aberration of the camera optical lens shown;

[0055] Fig. 20 yes Fig.17 Schematic diagram of field curvature and distortion of the camera optical lens shown. DETAILED DESCRIPTION

[0056] 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.

[0057] Reference Figure 1-16 The present invention provides a camera optical lens 10, 20, 30, 40. Figure 1 , 5 , 9, and 13 show the camera optical lenses 10, 20, 30, and 40 of the present invention, respectively. The camera optical lenses 10, 20, 30, and 40 include a total of four lenses, specifically, from the object side to the image side, they are: aperture S1, first lens L1, second lens L2, third lens L3, and fourth lens L4. An optical element such as an optical filter GF may be provided between the fourth lens L4 and the image plane Si.

[0058] The first lens L1 has positive refractive power, the second lens L2 has negative refractive power, the third lens L3 has positive refractive power, and the fourth lens L4 has negative refractive power. In other optional embodiments, the refractive power of the above lenses can also be set to other positive or negative distributions.

[0059] The focal length of the camera optical lens is defined as f, and the focal length of the first lens L1 is defined as f1, which satisfies the following relationship: 0.65≤f1 / f≤0.85. Within the range of this relationship, the focal length value of the first lens L1 can be controlled. By reasonably allocating the focal length, it is beneficial to control temperature drift and achieve good temperature performance.

[0060] The focal length of the second lens L2 is defined as f2, 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: -1.50≤(f3-f4) / f2≤-0.80. Within the range of the relationship, the optical focal length of the camera optical lens is reasonably allocated, so that the camera optical lens has better imaging quality and lower sensitivity.

[0061] The central curvature radius of the object side surface of the second lens L2 is defined as R3, and the central curvature radius of the image side surface of the second lens L2 is defined as R4, which satisfy the following relationship: 0.20≤(R3+R4) / f2≤0.80. Within the range of the relationship, by reasonably controlling the surface shape of the second lens L2, it is beneficial to reduce the sensitivity of the camera optical lens. In addition, the manufacturing yield can be improved by reducing the difficulty of molding. At the same time, the stray light generated by the camera optical lens can be reduced, and the imaging quality of the camera optical lens can be improved.

[0062] The on-axis thickness of the first lens L1 is defined as d1, and the on-axis thickness of the second lens L2 is defined as d3, which satisfy the following relationship: 2.00≤d1 / d3≤7.00. The relationship specifies the ratio of the on-axis thickness of the first lens L1 to the second lens L2. By reasonably allocating the lens thicknesses, it is helpful to reduce the molding difficulty in the actual production process and improve the yield rate.

[0063] The combined focal length of the second lens L2, the third lens L3 and the fourth lens L4 is defined as f234, the axial thickness of the second lens L2 is d3, the axial thickness of the third lens L3 is d5, and the axial thickness of the fourth lens L4 is d7, which satisfy the following relationship: -3.50≤f234 / (d3+d5+d7)≤-2.50. Within the range of the relationship, the rear end lens is helped to maintain a negative refractive power of sufficient strength to correct the off-axis aberration at the image side end, and at the same time, the total optical length can be effectively shortened to achieve the purpose of miniaturization, thereby expanding the application range of the product.

[0064] When the above relationship expressions are satisfied, the camera optical lenses 10, 20, 30, 40 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, the camera optical lenses 10, 20, 30, 40 are particularly suitable for mobile phone camera lens assemblies and WEB camera lenses composed of high-pixel CCD, CMOS and other camera elements.

[0065] Based on the above relationship and the functions that can be achieved, the characteristics of each lens are further refined as follows.

[0066] 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 convex at the paraxial position; the object side surface of the second lens L2 is concave at the paraxial position, and the image side surface of the second lens L2 is concave at the paraxial position; the object side surface of the third lens L3 is concave at the paraxial position, and the image side surface of the third lens L3 is convex at the paraxial position; the object side surface of the fourth lens L4 is convex at the paraxial position, and the image side surface of the fourth lens L4 is concave at the paraxial position. In other optional embodiments, the object side surface and image side surface of the above lenses can also be set to other concave and convex distributions.

[0067] In addition, the central curvature radius of the object side surface of the third lens L3 is R5, the central curvature radius of the image side surface of the third lens L3 is R6, and the following relationship is satisfied: 2.00≤(R5+R6) / (R5-R6)≤3.00. This relationship specifies the shape of the third lens L3, which is beneficial to correcting the astigmatism and distortion of the camera optical lens 10, making the distortion |Distortion|≤5%, and reducing the possibility of vignetting.

[0068] The sum of the axial thicknesses of the first lens L1, the second lens L2, the third lens L3 and the fourth lens L4 is defined as ∑Ti, the total optical length of the camera optical lens 10 is TTL, and the following relationship is satisfied: 0.50≤∑Ti / TTL≤0.70, which specifies the ratio of the sum of the axial thicknesses of all lenses to the total optical length. By reasonably allocating the proportion of the lens thickness, it is helpful to achieve ultra-thinness.

[0069] The central curvature radius of the object side of the first lens L1 is R1, and the central curvature radius of the image side of the first lens L2 is R2, which satisfies the following relationship: -1.41≤(R1+R2) / (R1-R2)≤-0.28, which specifies the shape of the first lens L1. Within this range, it is helpful to achieve an ultra-wide angle. Preferably, -0.88≤(R1+R2) / (R1-R2)≤-0.35 is satisfied.

[0070] The first lens L1 also satisfies the following relationship: 1.63≤d1 / TTL≤6.17, which is conducive to miniaturization within the range of the relationship. Preferably, 2.61≤d1 / TTL≤4.94 is satisfied.

[0071] The second lens L2 satisfies the following relationship: -4.23≤f2 / f≤-0.84, which specifies the ratio of the focal length f2 of the second lens L2 to the focal length of the camera optical lens 10. Within this range, the field curvature of the system can be effectively balanced. Preferably, -2.64≤f2 / f≤-1.05 is satisfied.

[0072] The second lens L2 also satisfies the following relationship: 0.04≤(R3+R4) / (R3-R4)≤0.42, which specifies the shape of the second lens L2. Within this range, it is helpful to achieve an ultra-wide angle. Preferably, 0.06≤(R3+R4) / (R3-R4)≤0.34 is satisfied.

[0073] The second lens L2 also satisfies the following relationship: 0.30≤d3 / TTL≤2.79, which is conducive to miniaturization within the range of the relationship. Preferably, 0.48≤d3 / TTL≤2.23 is satisfied.

[0074] The third lens L3 satisfies the following relationship: 0.39≤f3 / f≤1.51. Through the reasonable distribution of the optical power, the system has better imaging quality and lower sensitivity. Preferably, 0.63≤f3 / f≤1.21 is satisfied.

[0075] The third lens L3 also satisfies the following relationship: 1.83≤d5 / TTL≤8.32, which is conducive to miniaturization within the range of the relationship. Preferably, 2.92≤d5 / TTL≤6.66 is satisfied.

[0076] The fourth lens L4 satisfies the following relationship: -1.76≤f4 / f≤-0.48, which specifies the ratio of the focal length of the fourth lens L4 to the imaging optical lens 10. By reasonably allocating the optical focal length of the imaging optical lens 10, the imaging optical lens 10 has good sensitivity performance while meeting the design of a large aperture. Preferably, -1.10≤f4 / f≤-0.60 is satisfied.

[0077] The central curvature radius of the object side of the fourth lens L4 is R7, the central curvature radius of the image side of the fourth lens L4 is R8, and the following relationship is satisfied: 0.97≤(R7+R8) / (R7-R8)≤3.63, which specifies the shape of the fourth lens L4. Within the range of the relationship, with the development of ultra-thin wide-angle lenses, it is beneficial to correct the aberration of the off-axis picture angle and other problems. Preferably, 1.56≤(R7+R8) / (R7-R8)≤2.91 is satisfied.

[0078] The fourth lens L4 also satisfies the following relationship: 1.10≤d7 / TTL≤4.76, which is conducive to miniaturization within the range of the relationship. Preferably, 1.75≤d7 / TTL≤3.81 is satisfied.

[0079] In this embodiment, the first lens L1, the second lens L2, the third lens L3 and the fourth lens L4 are all made of plastic. In other optional embodiments, each lens may also be made of other materials.

[0080] In this embodiment, the field of view of the camera optical lens 10 in the diagonal direction is defined as FOV, which satisfies the following relationship: FOV≥72.78°, thereby facilitating wide-angle viewing. Preferably, FOV≥73.53° is satisfied.

[0081] In this embodiment, the image height of the camera optical lens 10 is IH, and satisfies the following relationship: TTL / IH≤1.67, which is conducive to miniaturization. Preferably, TTL / IH≤1.62 is satisfied.

[0082] In this embodiment, the aperture value FNO of the camera optical lens 10 is less than or equal to 2.93, thereby achieving a large aperture and good imaging performance of the camera optical lens.

[0083] The combined focal length of the first lens L1 and the second lens L2 is f12, and satisfies the following relationship: 0.52≤f12 / f≤1.82, which specifies the ratio of the combined focal length f12 of the first lens L1 and the second lens L2 to the focal length f of the camera optical lens 10. Within the range of the relationship, the aberration and distortion of the camera optical lens 10 can be eliminated, and the back focal length of the camera optical lens 10 can be suppressed to maintain the miniaturization of the camera optical lens 10. Preferably, 0.83≤f12 / f≤1.46.

[0084] The imaging optical lens 10 of the present invention will be described below using examples. The symbols described in each example are as follows: The focal length, axial distance, central curvature radius, and axial thickness are in units of mm.

[0085] TTL: total optical length (the axial distance from the object side of the first lens L1 to the image surface Si), in mm;

[0086] Aperture value FNO: refers to the ratio of the effective focal length of the camera optical lens to the entrance pupil diameter.

[0087] Next, the technical solution of the present invention is specifically described with four implementation modes. At the same time, a comparative implementation mode is provided as a reference. When the range of the above relationship is exceeded, the technical effect of the present invention cannot be achieved.

[0088] (First Embodiment)

[0089] Table 1 shows design data of the imaging optical lens 10 according to the first embodiment of the present invention.

[0090]

Table 1

[0091]

[0092] The meaning of each symbol is as follows.

[0093] S1: aperture;

[0094] R: radius of curvature at the center of the optical surface;

[0095] R1: the central curvature radius of the object side of the first lens L1;

[0096] R2: the central curvature radius of the image side surface of the first lens L1;

[0097] R3: the central curvature radius of the object side surface of the second lens L2;

[0098] R4: the central curvature radius of the image side surface of the second lens L2;

[0099] R5: the central curvature radius of the object side surface of the third lens L3;

[0100] R6: the central curvature radius of the image side surface of the third lens L3;

[0101] R7: the central curvature radius of the object side surface of the fourth lens L4;

[0102] R8: the central curvature radius of the image side surface of the fourth lens L4;

[0103] R9: the central curvature radius of the object side of the optical filter GF;

[0104] R10: the central curvature radius of the image side of the optical filter GF;

[0105] d: the axial thickness of the lens, the axial distance between lenses;

[0106] d0: the axial distance from the aperture S1 to the object side of the first lens L1;

[0107] d1: axial thickness of the first lens L1;

[0108] d2: the axial distance from the image side surface of the first lens L1 to the object side surface of the second lens L2;

[0109] d3: axial thickness of the second lens L2;

[0110] d4: the axial distance from the image side surface of the second lens L2 to the object side surface of the third lens L3;

[0111] d5: axial thickness of the third lens L3;

[0112] d6: the axial distance from the image side surface of the third lens L3 to the object side surface of the fourth lens L4;

[0113] d7: axial thickness of the fourth lens L4;

[0114] d8: the axial distance from the image side surface of the fourth lens L4 to the object side surface of the optical filter GF;

[0115] d9: axial thickness of the optical filter GF;

[0116] d10: the axial distance from the image side of the optical filter GF to the image surface Si;

[0117] nd: refractive index of d-line (d-line is green light with a wavelength of 555nm);

[0118] nd1: refractive index of the first lens L1 at the d-line;

[0119] nd2: refractive index of the d-line of the second lens L2;

[0120] nd3: refractive index of the third lens L3 at the d-line;

[0121] nd4: refractive index of the d-line of the fourth lens L4;

[0122] ndg: refractive index of the d-line of the optical filter GF;

[0123] vd: Abbe number;

[0124] v1: Abbe number of the first lens L1;

[0125] v2: Abbe number of the second lens L2;

[0126] v3: Abbe number of the third lens L3;

[0127] v4: Abbe number of the fourth lens L4;

[0128] vg: Abbe number of the optical filter GF.

[0129] Table 2 shows aspherical surface data of each lens in the imaging optical lens 10 according to the first embodiment of the present invention.

[0130]

Table 2

[0131]

[0132]

[0133] 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).

[0134] z=(cr 2 ) / {1+[1-(k+1)(c 2 r 2 )] 1 / 2}+A4r 4 +A6r 6 +A8r 8 +A10r10 +A12r 12 +A14r 14 +A

[0135] 16r 16 +A18r 18 +A20r 20 +A22r 22 +A24r 24 +A26r 26 +A28r 28 +A30r 30 (1)

[0136] 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).

[0137] Figure 2 , Figure 3 Schematic diagrams showing axial aberration and chromatic aberration of magnification of light with wavelengths of 430 nm, 470 nm, 510 nm, 555 nm, 610 nm and 650 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 555 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.

[0138] Table 11 that follows shows the values ​​corresponding to the parameters specified in the conditional expressions and various numerical values ​​in each embodiment.

[0139] As shown in Table 11, the first embodiment satisfies each conditional expression.

[0140] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 10 is 1.259 mm, the full field of view image height IH is 2.911 mm, the field of view angle FOV in the diagonal direction is 84.97°, and the camera optical lens 10 has a large aperture and good optical performance, its on-axis and off-axis chromatic aberrations are fully corrected, and has excellent optical properties.

[0141] (Second Embodiment)

[0142] The second embodiment is substantially the same as the first embodiment, and the meanings of the symbols are the same as those of the first embodiment. Only the differences are listed below.

[0143] Figure 5 FIG. 2 shows an imaging optical lens 20 according to a second embodiment of the present invention.

[0144] Table 3 shows design data of the imaging optical lens 20 according to the second embodiment of the present invention.

[0145]

Table 3

[0146]

[0147] Table 4 shows aspherical surface data of each lens in the imaging optical lens 20 according to the second embodiment of the present invention.

[0148]

Table 4

[0149]

[0150]

[0151] Figure 6 , Figure 7 Schematic diagrams showing axial aberration and chromatic aberration of magnification of light with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm and 650 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 555 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.

[0152] As shown in Table 11, the second embodiment satisfies each conditional expression.

[0153] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 20 is 1.259 mm, the full field of view image height IH is 2.911 mm, the field of view angle FOV in the diagonal direction is 85.01°, and the camera optical lens 20 has a large aperture and good optical performance, its on-axis and off-axis chromatic aberrations are fully corrected, and has excellent optical properties.

[0154] (Third Embodiment)

[0155] The third embodiment is substantially the same as the first embodiment, and the meanings of the symbols are the same as those of the first embodiment, and only the differences are listed below.

[0156] Fig. 9 FIG. 1 shows an imaging optical lens 30 according to a third embodiment of the present invention.

[0157] Table 5 shows design data of the imaging optical lens 30 according to the third embodiment of the present invention.

[0158]

Table 5

[0159]

[0160] Table 6 shows aspherical surface data of each lens in the imaging optical lens 30 according to the third embodiment of the present invention.

[0161]

Table 6

[0162]

[0163]

[0164] Fig.10 , Fig.11 Schematic diagrams showing axial aberration and chromatic aberration of magnification of light with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm and 650 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 555 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.

[0165] Table 11 below lists the values ​​corresponding to the various conditional expressions in this embodiment according to the above conditional expressions. Obviously, the imaging optical lens 30 of this embodiment satisfies the above conditional expressions.

[0166] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 30 is 1.259 mm, the full field of view image height IH is 2.911 mm, the field of view angle FOV in the diagonal direction is 75.07°, and the camera optical lens 30 has a large aperture and good optical performance, its on-axis and off-axis chromatic aberrations are fully corrected, and has excellent optical properties.

[0167] (Fourth Embodiment)

[0168] The fourth embodiment is substantially the same as the first embodiment, and the meanings of the symbols are the same as those of the first embodiment, and only the differences are listed below.

[0169] Fig.13 FIG. 4 shows an imaging optical lens 40 according to a fourth embodiment of the present invention.

[0170] Table 7 shows design data of the imaging optical lens 40 according to the fourth embodiment of the present invention.

[0171]

Table 7

[0172]

[0173]

[0174] Table 8 shows aspherical surface data of each lens in the imaging optical lens 40 according to the fourth embodiment of the present invention.

[0175]

Table 8

[0176]

[0177] Fig.14 , Fig.15 Schematic diagrams showing axial aberration and chromatic aberration of magnification of light with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm and 650 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 555 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.

[0178] The following Table 11 lists the numerical values ​​corresponding to the conditional expressions in this embodiment according to the above conditional expressions. Obviously, the imaging optical lens 40 of this embodiment satisfies the above conditional expressions.

[0179] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 40 is 1.259 mm, the full field of view image height IH is 2.911 mm, the field of view angle FOV in the diagonal direction is 74.27°, and the camera optical lens 40 has a large aperture and good optical performance, its on-axis and off-axis chromatic aberrations are fully corrected, and has excellent optical properties.

[0180] (Comparative Implementation)

[0181] The comparative embodiment is substantially the same as the first embodiment, and the meanings of the symbols are the same as those of the first embodiment, and only the differences are listed below.

[0182] Fig.17 Shown is a camera optical lens 50 according to a comparative embodiment.

[0183] Table 9 shows design data of the imaging optical lens 50 according to the comparative embodiment of the present invention.

[0184]

Table 9

[0185]

[0186]

[0187] Table 10 shows the aspherical surface data of each lens in the imaging optical lens 50 according to the comparative embodiment of the present invention.

[0188]

Table 10

[0189]

[0190] Fig.18 , Fig.19 Schematic diagrams of axial aberration and magnification chromatic aberration of light with wavelengths of 470 nm, 510 nm, 555 nm, 610 nm and 650 nm after passing through the camera optical lens 50 of the comparative embodiment are respectively shown. Fig. 20 It shows a schematic diagram of field curvature and distortion of light with a wavelength of 555 nm after passing through the camera optical lens 50 of the comparative 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.

[0191] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 50 is 1.259 mm, the full field of view image height IH is 2.911 mm, and the field of view angle FOV in the diagonal direction is 87.27°.

[0192] Table 11 below lists the values ​​corresponding to the various conditional expressions in the comparative embodiment according to the above conditional expressions. Obviously, the camera optical lens 50 of the comparative embodiment does not satisfy the above conditional expression 0.65≤f1 / f≤0.85, which is not conducive to controlling temperature drift and has good temperature performance.

[0193]

Table 11

[0194]

[0195] 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, in order from the object side to the image side: a first lens having positive refractive power, a second lens having negative refractive power, a third lens having positive refractive power, and a fourth lens having 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 focal length of the third lens is f3, the focal length of the fourth lens is f4, the combined focal length of the second lens, the third lens and the fourth lens is f234, 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 axial thickness of the first lens is d1, the axial thickness of the second lens is d3, the axial thickness of the third lens is d5, the axial thickness of the fourth lens is d7, and the following relationship is satisfied: 0.65≤f1 / f≤0.85; -1.50≤(f3-f4) / f2≤-0.80; 0.20≤(R3+R4) / f2≤0.80; 2.00≤d1 / d3≤7.00; -3.50≤f234 / (d3+d5+d7)≤-2.

50.

2. The imaging optical lens according to claim 1, characterized in that: 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, and the following relationship is satisfied: 2.00≤(R5+R6) / (R5-R6)≤3.

00.

3. The imaging optical lens according to claim 1, characterized in that: The sum of the axial thicknesses of the first lens, the second lens, the third lens and the fourth lens is ∑Ti, the total optical length of the camera optical lens is TTL, and the following relationship is satisfied: 0.50≤∑Ti / TTL≤0.

70.

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 convex at the paraxial position; The axial thickness of the first lens is d1, 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 total optical length of the camera optical lens is TTL, and the following relationship is satisfied: -1.41≤(R1+R2) / (R1-R2)≤-0.28; 1.63≤d1 / TTL≤6.

17.

5. The imaging optical lens according to claim 1, wherein: The object side surface of the second lens is concave at the paraxial position, and the image side surface of the second lens is concave at the paraxial position; The total optical length of the camera optical lens is TTL and satisfies the following relationship: -4.23≤f2 / f≤-0.84; 0.04≤(R3+R4) / (R3-R4)≤0.42; 0.30≤d3 / TTL≤2.

79.

6. The imaging optical lens according to claim 1, characterized in that: The object side surface of the third lens is concave at the paraxial position, and the image side surface of the third lens is convex at the paraxial position; The total optical length of the camera optical lens is TTL and satisfies the following relationship: 0.39≤f3 / f≤1.51; 1.83≤d5 / TTL≤8.

32.

7. The imaging optical lens according to claim 1, characterized in that: The object side surface of the fourth lens is convex at the paraxial position, and the image side surface of the fourth lens is concave at the paraxial position; 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, the total optical length of the camera optical lens is TTL, and the following relationship is satisfied: -1.76≤f4 / f≤-0.48; 0.97≤(R7+R8) / (R7-R8)≤3.63; 1.10≤d7 / TTL≤4.

76.

8. The imaging optical lens according to claim 1, characterized in that: The camera optical lens aperture value FNO is less than or equal to 2.

96.

9. The imaging optical lens according to claim 1, characterized in that: The total optical length of the camera optical lens is TTL, the image height of the camera optical lens is IH, and the following relationship is satisfied: TTL / IH≤1.

67.

10. The imaging optical lens according to claim 1, characterized in that: The combined focal length of the first lens and the second lens is f12, and satisfies the following relationship: 0.52≤f12 / f≤1.82.

Images