Camera lens

Abstract

The application relates to the field of optical lenses, and discloses a camera optical lens which comprises four lenses, the four 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, and a fourth lens with positive refractive power; and the following conditions are met: -1.40<=f1 / f<=-1.15; 35.00<=FOV / Fno<=60.00; 2.00<=ET1 / d1<=2.90; 1.70<=f3 / f4<=3.20; 0.60<=(R3+R4) / f2<=2.40. The camera optical lens provided by the application has the effects of large field of view, large depth of field and high-definition imaging.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of optical lens, in particular to a camera optical lens applied to medical imaging equipment.

BACKGROUND

[0002] In recent years, with the rapid development of medical equipment, the demand for small-sized camera optical lens for endoscopy is increasing, and the forming quality of general camera optical lens is poor, which cannot meet the needs of medical imaging equipment.

[0003] The camera optical lens in the related art mostly adopts a three-piece, four-piece or even five-piece lens structure, among which the four-piece lens structure is the most common. However, how to reasonably plan the focal length, thickness and surface shape of the lens under the premise of the same size of the four-piece lens structure so as to improve the field of view, depth of field and imaging quality has become the biggest problem today.

[0004] Therefore, there is an urgent need for a new camera optical lens to solve the above problems.

SUMMARY

[0005] In view of the above problems, the purpose of the present application is to provide a new camera optical lens which meets the design requirements of large field of view, large depth of field and high-definition imaging.

[0006] To solve the above technical problems, the embodiment of the present application provides a camera optical lens which comprises four lenses, and the four 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 and a fourth lens with positive refractive power.

[0007] 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 second lens is f2, the focal length of the third lens is f3, the focal length of the fourth lens is f4, the field of view angle of 1.0 field of view of the camera optical lens is FOV, the aperture value of the camera optical lens is Fno, the edge thickness of the optical effective diameter of the first lens is ET1, the on-axis thickness of the first lens is d1, 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, and the following condition formula is satisfied:

[0008] -1.40≤f1 / f≤-1.15;

[0009] 35.00≤FOV / Fno≤66.00;

[0010] 2.00≤ET1 / d1≤2.90;

[0011] 1.70≤f3 / f4≤3.20;

[0012] 0.60≤(R3+R4) / f2≤2.40.

[0013] Preferably, the total optical length of the photographing optical lens is TTL, and the following condition is met:

[0014] 5.50≤TTL / f≤7.00.

[0015] Preferably, at least one of the first lens, the second lens, the third lens and the fourth lens is made of glass.

[0016] Preferably, the maximum value of the absolute value of the distortion in the 0.7 field of view of the photographing optical lens is Dmax, and the following condition is met:

[0017] Dmax≤2.00%.

[0018] Preferably, the image side surface of the first lens is concave at the paraxial region;

[0019] The total optical length of the photographing optical lens is TTL, 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, and the following condition is met:

[0020] 0.57≤(R1+R2) / (R1-R2)≤1.30;

[0021] 0.08≤d1 / TTL≤0.15.

[0022] Preferably, the object side surface of the second lens is convex at the paraxial region, and the image side surface of the second lens is concave at the paraxial region;

[0023] The total optical length of the photographing optical lens is TTL, the on-axis thickness of the second lens is d3, and the following condition is met:

[0024] 2.09≤f2 / f≤3.99;

[0025] -7.23≤(R3+R4) / (R3-R4)≤-1.89;

[0026] 0.14≤d3 / TTL≤0.30.

[0027] Preferably, the image side surface of the third lens is convex at the paraxial region;

[0028] The total optical length of the photographing optical lens is TTL, the central curvature radius of the object side surface of the third lens is R5, the central curvature radius of the image side surface of the third lens is R6, and the following condition is met:

[0029] 3.56≤f3 / f≤5.39;

[0030] -0.18≤(R5+R6) / (R5-R6)≤1.04;

[0031] 0.07≤d5 / TTL≤0.15.

[0032] Preferably, the object side surface of the fourth lens is convex at the paraxial region, and the image side surface of the fourth lens is convex at the paraxial region.

[0033] The total optical length of the photographing optical lens is TTL, the central radius of curvature of the object side surface of the fourth lens is R7, the central radius of curvature of the image side surface of the fourth lens is R8, and the on-axis thickness of the fourth lens is d7, and the following conditions are satisfied:

[0034] 1.62≤f4 / f≤2.02;

[0035] -0.16≤(R7+R8) / (R7-R8)≤0.71;

[0036] 0.10≤d7 / TTL≤0.23.

[0037] Preferably, the following conditions are satisfied:

[0038] 2.19≤Fno≤3.37.

[0039] Compared with the related art, the photographing optical lens can obtain a photographing optical lens with a large field of view, a large depth of field, and high-definition imaging by limiting the ratio of the focal length of the first lens to the focal length of the photographing optical lens, the ratio of the field of view angle of the 1.0 field of view of the photographing optical lens to the aperture value of the photographing optical lens, the ratio of the edge thickness of the optical effective diameter of the first lens to the on-axis thickness of the first lens, the ratio of the focal length of the third lens to the focal length of the fourth lens, and the surface type of the second lens, and is especially suitable for medical imaging equipment. BRIEF DESCRIPTION OF DRAWINGS

[0040] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings needed in the embodiment description. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort based on these drawings, and the drawings include:

[0041] Figure 1 is a structural schematic diagram of the photographing optical lens of the first embodiment;

[0042] Figure 2 is a structural schematic diagram of the photographing optical lens of the second embodiment; Figure 1 is an axial aberration schematic diagram of the photographing optical lens shown in FIG. 2.

[0043] Figure 3 yes Figure 1 Schematic diagram of magnification chromatic aberration of the camera optical lens shown;

[0044] Figure 4 yes Figure 1 Schematic diagram of field curvature and distortion of the camera optical lens shown;

[0045] Figure 5 2 is a schematic structural diagram of a second embodiment of an imaging optical lens;

[0046] Figure 6 yes Figure 5 Schematic diagram of axial aberration of the camera optical lens shown;

[0047] Figure 7 yes Figure 5 Schematic diagram of magnification chromatic aberration of the camera optical lens shown;

[0048] Figure 8 yes Figure 5 Schematic diagram of field curvature and distortion of the camera optical lens shown;

[0049] Figure 9 2 is a schematic structural diagram of a third embodiment of an imaging optical lens;

[0050] Figure 10 yes Figure 9 Schematic diagram of axial aberration of the camera optical lens shown;

[0051] Figure 11 yes Figure 9 Schematic diagram of magnification chromatic aberration of the camera optical lens shown;

[0052] Figure 12 yes Figure 9 Schematic diagram of field curvature and distortion of the camera optical lens shown;

[0053] Figure 13 2 is a schematic structural diagram of a fourth embodiment of an imaging optical lens;

[0054] Figure 14 yes Figure 13 Schematic diagram of axial aberration of the camera optical lens shown;

[0055] Figure 15 yes Figure 13 Schematic diagram of magnification chromatic aberration of the camera optical lens shown;

[0056] Figure 16 yes Figure 13 Schematic diagram of field curvature and distortion of the camera optical lens shown;

[0057] Figure 17is a structural schematic diagram of a photographing optical lens of a fifth embodiment;

[0058] Figure 18 is Figure 17 is an axial aberration schematic diagram of the photographing optical lens shown in

[0059] Figure 19 is Figure 17 is a lateral chromatic aberration schematic diagram of the photographing optical lens shown in

[0060] Figure 20 is Figure 17 is a field curvature and distortion schematic diagram of the photographing optical lens shown in

[0061] Figure 21 is a structural schematic diagram of a photographing optical lens of a sixth embodiment;

[0062] Figure 22 is Figure 21 is an axial aberration schematic diagram of the photographing optical lens shown in

[0063] Figure 23 is Figure 21 is a lateral chromatic aberration schematic diagram of the photographing optical lens shown in

[0064] Figure 24 is Figure 21 is a field curvature and distortion schematic diagram of the photographing optical lens shown in

[0065] Figure 25 is a structural schematic diagram of a photographing optical lens of a seventh embodiment;

[0066] Figure 26 is Figure 25 is an axial aberration schematic diagram of the photographing optical lens shown in

[0067] Figure 27 is Figure 25 is a lateral chromatic aberration schematic diagram of the photographing optical lens shown in

[0068] Figure 28 is Figure 25 is a field curvature and distortion schematic diagram of the photographing optical lens shown in

DETAILED DESCRIPTION

[0069] In order to make the objects, technical solutions, and advantages of the present application clearer, the embodiments of the present application will be described in detail below with reference to the drawings. However, those skilled in the art can understand that, in the embodiments of the present application, many technical details are presented in order to make the readers better understand the present application. However, the technical solutions claimed by the present application can be realized even without these technical details and based on various changes and modifications of the following embodiments.

[0070] With reference to the drawings, the present application provides a camera lens 10, 20, 30, 40, 50, 60, 70, Figure 1 、 Figure 5 、 Figure 9 、 Figure 13 、 Figure 17 、 Figure 21 、 Figure 25 , the camera lens 10, 20, 30, 40, 50, 60, 70 of the present application is shown, which comprises four lenses in total, specifically, the camera lens 10, 20, 30, 40, 50, 60, 70 comprises in order from the object side to the image side: a first lens L1 with negative refractive power, a second lens L2 with positive refractive power, an aperture S1, a third lens L3 with positive refractive power, and a fourth lens L4 with positive refractive power. An optical element such as an optical filter GF can be arranged between the fourth lens L4 and the image plane Si.

[0071] The focal length of the camera lens 10, 20, 30, 40, 50, 60, 70 is defined as f, the focal length of the first lens L1 is defined as f1, and the following condition is satisfied: -1.40≤f1 / f≤-1.15, which defines the ratio of the focal length of the first lens L1 to the focal length of the camera lens 10, 20, 30, 40, 50, 60, 70, i.e. by reasonably distributing the focal length of the camera lens 10, 20, 30, 40, 50, 60, 70, it can have better imaging quality and lower sensitivity.

[0072] The field of view of 1.0 of the camera lens 10, 20, 30, 40, 50, 60, 70 is defined as FOV, and the aperture value of the camera lens 10, 20, 30, 40, 50, 60, 70 is defined as Fno, and the following condition is satisfied: 35.00≤FOV / Fno≤66.00.

[0073] The edge thickness of the optical effective diameter of the first lens L1 is defined as ET1, and the central thickness of the first lens L1 is defined as d1, and the following condition is satisfied: 2.00≤ET1 / d1≤2.90, which defines the ratio of the edge thickness of the first lens L1 to the central thickness, which is helpful for the processing of the lens and the assembly of the lens.

[0074] 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, and the following condition is satisfied: 1.70≤f3 / f4≤3.20, which defines the ratio of the focal length of the third lens L3 to the focal length of the fourth lens L4, and by reasonably distributing the focal length of the camera lens 10, 20, 30, 40, 50, 60, 70, it is helpful for the smooth transition of light and improves the imaging quality.

[0075] The focal length of the second lens L2 is defined as f2, 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. The following condition is satisfied: 0.60≤(R3+R4) / f2≤2.40. This can reasonably control the surface shape of the second lens L2, help reduce the sensitivity of the imaging optical lens 10, 20, 30, 40, 50, 60, 70, and also reduce the stray light generated by the lens, and improve the imaging quality of the lens.

[0076] Under the condition of satisfying the above several condition formulas, the imaging optical lens 10, 20, 30, 40, 50, 60, 70 has good optical performance while meeting the design requirements of large field of view, large depth of field, and high-definition imaging. According to the characteristics of the imaging optical lens 10, 20, 30, 40, 50, 60, 70, the imaging optical lens 10, 20, 30, 40, 50, 60, 70 is particularly suitable for mobile phone camera lens assemblies, WEB camera lenses, and medical imaging equipment composed of high-pixel CCD, CMOS, and other imaging elements.

[0077] The total optical length of the imaging optical lens 10, 20, 30, 40, 50, 60, 70 is defined as TTL, and the following condition is satisfied: 5.50≤TTL / f≤7.00. The telephoto ratio is specified. By being less than the upper limit value of the condition formula, the optical total length can be controlled to be shorter, which is easy to realize miniaturization. On the other hand, by being greater than the lower limit value of the condition formula, it is easy to correct distortion and on-axis chromatic aberration, and good optical performance can be maintained.

[0078] The first lens L1 is made of plastic, the second lens L2 is made of plastic, the third lens L3 is made of plastic, and the fourth lens L4 is made of glass. This can effectively allocate material properties and effectively correct chromatic aberration, so that the chromatic aberration |LC|≤7.0μm. Of course, other materials can also be used for each lens, but at least one belongs to glass.

[0079] The maximum value of the absolute value of the distortion within the 0.7 field of view of the imaging optical lens is defined as Dmax, and the following condition is satisfied: Dmax≤2.00%.

[0080] Based on the above condition formulas and the functions that can be achieved, the characteristics of each lens are further refined as follows.

[0081] The object side surface of the first lens L1 is convex or concave at the near axis, and the image side surface is concave at the near axis. The object side surface and the image side surface of the first lens L1 can also be provided with other concave and convex distribution conditions.

[0082] The central curvature radius of the object side surface of the first lens L1 is defined as R1, and the central curvature radius of the image side surface of the first lens L1 is defined as R2, and the following condition is satisfied: 0.57≤(R1+R2) / (R1-R2)≤1.30. The shape of the first lens L1 is reasonably controlled so that the first lens L1 can effectively correct the system spherical aberration.

[0083] The on-axis thickness of the first lens L1 is defined as d1, and the following condition is satisfied: 0.08≤d1 / TTL≤0.15. Within the condition range, the ultra-thinning is facilitated.

[0084] The object side surface of the second lens L2 is convex at the paraxial region, and the image side surface of the second lens L2 is concave at the paraxial region. The object side surface and the image side surface of the second lens L2 can also be provided with other concave and convex distribution conditions.

[0085] The following condition is satisfied: 2.09≤f2 / f≤3.99. By controlling the positive focal power of the second lens L2 within a reasonable range, the aberration of the optical system is corrected.

[0086] The following condition is satisfied: -7.23≤(R3+R4) / (R3-R4)≤-1.89. The shape of the second lens L2 is specified. When within the range, the problem of on-axis chromatic aberration is corrected as the lens develops towards ultra-thinning and wide-angle.

[0087] The on-axis thickness of the second lens L2 is defined as d3, and the following condition is satisfied: 0.14≤d3 / TTL≤0.30. Within the condition range, the ultra-thinning is facilitated.

[0088] The object side surface of the third lens L3 is concave or convex at the paraxial region, and the image side surface of the third lens L3 is convex at the paraxial region. The object side surface and the image side surface of the third lens L3 can also be provided with other convex and concave distribution conditions.

[0089] The following condition is satisfied: 3.56≤f3 / f≤5.39. By reasonably distributing the focal power, the system has better imaging quality and lower sensitivity.

[0090] The central curvature radius of the object side surface of the third lens L3 is defined as R5, and the central curvature radius of the image side surface of the third lens L3 is defined as R6, and the following condition is satisfied: -0.18≤(R5+R6) / (R5-R6)≤1.04. The shape of the third lens L3 is specified, which is conducive to the molding of the third lens L3. Within the specified range of the condition, the degree of deflection of light passing through the lens is alleviated, and the aberration is effectively reduced.

[0091] The on-axis thickness of the third lens L3 is defined as d5, and the following condition is satisfied: 0.07≤d5 / TTL≤0.15. Within the range of the condition, the ultra-thinning is facilitated.

[0092] The object side surface of the fourth lens L4 is convex at the paraxial region, and the image side surface of the fourth lens L4 is convex at the paraxial region. The object side surface and the image side surface of the fourth lens L4 can also be provided with other convex or concave distributions.

[0093] The following condition is satisfied: 1.62≤f4 / f≤2.02. Through reasonable distribution of the optical power, the system has better imaging quality and lower sensitivity.

[0094] The central curvature radius of the object 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. The following condition is satisfied: -0.16≤(R7+R8) / (R7-R8)≤0.71. The shape of the fourth lens L4 is specified, and within the range, the problems of aberration at the off-axis angle and the like are facilitated to be corrected with the development of the ultra-thinning and wide-angle.

[0095] The on-axis thickness of the fourth lens L4 is defined as d7, and the following condition is satisfied: 0.10≤d7 / TTL≤0.23. Within the range of the condition, the ultra-thinning is facilitated.

[0096] The imaging optical lens 10, 20, 30, 40, 50, 60, 70 satisfies the following condition: 2.19≤Fno≤3.37, so that a large aperture is realized, and the imaging performance is good.

[0097] The imaging optical lens 10, 20, 30, 40, 50, 60, 70 satisfies the following condition: 0.38≤TTL≤4.16.

[0098] The imaging optical lens 10, 20, 30, 40, 50, 60, 70 has the technical effects of large field of view, large depth of field, and high-definition imaging. According to the characteristics of the imaging optical lens 10, 20, 30, 40, 50, 60, 70, the imaging optical lens 10 is particularly suitable for medical imaging equipment.

[0099] The imaging optical lens 10, 20, 30, 40, 50, 60, 70 of the present application will be described below with each embodiment. The symbols described in each embodiment are as follows. The units of focal length, on-axis distance, central curvature radius, and on-axis thickness are mm.

[0100] TTL: total optical length (on-axis distance from the object side surface of the first lens L1 to the image surface Si), unit: mm;

[0101] F-number Fno: refers to the ratio of the effective focal length of the imaging optical lens 10, 20, 30, 40, 50, 60, 70 and the entrance pupil diameter.

[0102] 1.0 field of view image height IH: the height of the field of view corresponding to the effective image element of the sensor (i.e. half the length of the diagonal of the effective image element region of the sensor).

[0103] 1.0 field of view field of view angle FOV: the field of view angle corresponding to the effective image element of the sensor.

[0104] Next, the technical solutions of the present application are specifically described in seven embodiments, and when the above conditions are exceeded, the technical effects of the present application cannot be achieved.

[0105] (First embodiment)

[0106] The object side surface of the first lens L1 is convex at the near axis, and the object side surface of the third lens L3 is concave at the near axis.

[0107] Table 1 and Table 2 show the design data of the imaging optical lens 10 of the first embodiment of the present application.

[0108]

Table 1

[0109]

[0110] Wherein, the meanings of the symbols in the table are as follows:

[0111] S1: aperture;

[0112] R: central curvature radius at the center of the optical surface;

[0113] R1: central curvature radius of the object side surface of the first lens L1;

[0114] R2: central curvature radius of the image side surface of the first lens L1;

[0115] R3: central curvature radius of the object side surface of the second lens L2;

[0116] R4: central curvature radius of the image side surface of the second lens L2;

[0117] R5: central curvature radius of the object side surface of the third lens L3;

[0118] R6: central curvature radius of the image side surface of the third lens L3;

[0119] R7: central curvature radius of the object side surface of the fourth lens L4;

[0120] R8: central curvature radius of the image side surface of the fourth lens L4;

[0121] R9: center curvature radius of the object side surface of the optical filter GF

[0122] R10: center curvature radius of the image side surface of the optical filter GF

[0123] d: on-axis thickness of the lens, on-axis distance between the lenses

[0124] d0: on-axis distance from the stop S1 to the object side surface of the first lens L1

[0125] d1: on-axis thickness of the first lens L1

[0126] d2: on-axis distance from the image side surface of the first lens L1 to the object side surface of the second lens L2

[0127] d3: on-axis thickness of the second lens L2

[0128] d4: on-axis distance from the image side surface of the second lens L2 to the object side surface of the third lens L3

[0129] d5: on-axis thickness of the third lens L3

[0130] d6: on-axis distance from the image side surface of the third lens L3 to the object side surface of the fourth lens L4

[0131] d7: on-axis thickness of the fourth lens L4

[0132] d8: on-axis distance from the image side surface of the fourth lens L4 to the object side surface of the fifth lens L5

[0133] d9: on-axis thickness of the optical filter GF

[0134] d10: on-axis distance from the image side surface of the optical filter GF to the image plane Si

[0135] nd: refractive index of the d line (the d line is green light having a wavelength of 550 nm)

[0136] nd1: refractive index of the d line of the first lens L1

[0137] nd2: refractive index of the d line of the second lens L2

[0138] nd3: refractive index of the d line of the third lens L3

[0139] nd4: refractive index of the d line of the fourth lens L4

[0140] ndg: refractive index of the d line of the optical filter GF

[0141] vd: Abbe number

[0142] v1: Abbe number of the first lens L1

[0143] v2: Abbe number of the second lens L2;

[0144] v3: Abbe number of the third lens L3;

[0145] v4: Abbe number of the fourth lens L4;

[0146] vg: Abbe number of the optical filter GF.

[0147] Table 2 shows aspherical surface data of each lens in the imaging optical lens 10 of the first embodiment of the present application.

[0148]

Table 2

[0149]

[0150] For convenience, the aspherical surface of each lens surface uses the aspherical surface shown in the following formula (1). However, the present application is not limited to the aspherical polynomial form represented by the formula (1).

[0151] z = (cr 2 ) / {1+[1-(k+1)(c 2 r 2 )] 1 / 2}+A4r 4 +A6r 6 +A8r 8 +A10r 10 +A12r 12 +A14r

[0152] 14 +A16r 16 +A18r 18 +A20r 20 +A22r 22 +A24r 24 +A26r 26 +A28r 28 +A30r 30 (1)

[0153] where k is a conic coefficient, A4, A6, A8, A10, A12, A14, A16, A18, A20, A22, A24, A26, A28, A30 are aspherical coefficients, c is a curvature at the center of the optical surface, r is a perpendicular distance of a point on the aspherical curve from the optical axis, and z is an aspherical depth (a perpendicular distance between a point on the aspherical surface at a distance r from the optical axis and a tangent plane tangent to the aspherical surface at the vertex on the optical axis).

[0154] Figure 2 、 Figure 3Schematic diagram showing axial aberration and chromatic aberration of magnification of light with wavelengths of 655 nm, 610 nm, 555 nm, 510 nm, 470 nm, and 435 nm after passing through the imaging optical lens 10 of the first embodiment. Figure 4 FIG1 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.

[0155] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 10 is 0.197 mm, the image height IH of 1.0 field of view of the camera optical lens 10 is 1.048 mm, the field of view angle FOV of 1.0 field of view of the camera optical lens 10 is 139.66°, and the aperture value Fno of the camera optical lens 10 is 3.03. The camera optical lens 10 meets the design requirements of large field of view, large depth of field and high-definition imaging.

[0156] (Second embodiment)

[0157] The meanings of the symbols in the second embodiment are the same as those in the first embodiment.

[0158] Figure 5 FIG. 2 shows an imaging optical lens 20 according to a second embodiment of the present invention.

[0159] Tables 3 and 4 show design data of the imaging optical lens 20 according to the second embodiment of the present invention.

[0160]

Table 3

[0161]

[0162]

[0163] Table 4 shows aspherical surface data of each lens in the imaging optical lens 20 according to the second embodiment of the present invention.

[0164]

Table 4

[0165]

[0166]

[0167] Figure 6 、 Figure 7 Schematic diagram showing axial aberration and chromatic aberration of magnification of light with wavelengths of 655 nm, 610 nm, 555 nm, 510 nm, 470 nm, and 435 nm after passing through the imaging optical lens 20 of the second embodiment. Figure 8The field curvature and distortion of light with a wavelength of 555 nm after passing through the camera optical lens 20 of the second embodiment are shown in the following figure. Figure 8 The field curvature S is the sagittal direction field curvature, and T is the tangential direction field curvature.

[0168] In the present embodiment, the entrance pupil diameter ENPD of the camera optical lens 20 is 0.197 mm, the image height IH of 1.0 field of view of the camera optical lens 20 is 1.048 mm, the field of view FOV of 1.0 field of view of the camera optical lens 20 is 139.49°, the Fno of the camera optical lens 20 is 3.04, and the camera optical lens 20 meets the design requirements of large field of view, large depth of field, and high-definition imaging.

[0169] (third embodiment)

[0170] The symbol meanings of the third embodiment are the same as those of the first embodiment.

[0171] Different from the first embodiment, the object side surface of the first lens L1 is concave at the near axis, and the object side surface of the third lens L3 is convex at the near axis.

[0172] Figure 9 The camera optical lens 30 of the third embodiment of the present application is shown in the following figure.

[0173] Table 5 and Table 6 show the design data of the camera optical lens 30 of the third embodiment of the present application.

[0174]

Table 5

[0175]

[0176]

[0177] Table 6 shows the aspheric surface data of each lens in the camera optical lens 30 of the third embodiment of the present application.

[0178]

Table 6

[0179]

[0180]

[0181] Figure 10 、 Figure 11 The axial aberration and the magnification chromatic aberration of light with a wavelength of 655 nm, 610 nm, 555 nm, 510 nm, 470 nm, and 435 nm after passing through the camera optical lens 30 of the third embodiment are shown in the following figures. Figure 12 The field curvature and distortion of light with a wavelength of 555 nm after passing through the camera optical lens 30 of the third embodiment are shown in the following figure. Figure 12The field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0182] In this embodiment, the entrance pupil diameter ENPD of the camera optical lens 30 is 0.219 mm, the image height IH of 1.0 field of view of the camera optical lens 30 is 1.048 mm, the field of view angle FOV of 1.0 field of view of the camera optical lens 30 is 131.99°, and the aperture value Fno of the camera optical lens 30 is 3.03. The camera optical lens 30 meets the design requirements of large field of view, large depth of field and high-definition imaging.

[0183] (Fourth embodiment)

[0184] The meanings of the symbols in the fourth embodiment are the same as those in the first embodiment.

[0185] The difference from the first embodiment is that the object-side surface of the first lens L1 is concave at the paraxial position, and the object-side surface of the third lens L3 is convex at the paraxial position.

[0186] Figure 13 4. Table 7 and Table 8 show the design data of the imaging optical lens 40 according to the fourth embodiment of the present invention.

[0187]

Table 7

[0188]

[0189]

[0190] Table 8 shows aspherical surface data of each lens in the imaging optical lens 40 according to the fourth embodiment of the present invention.

[0191]

Table 8

[0192]

[0193]

[0194] Figure 14 、 Figure 15 Schematic diagram showing axial aberration and chromatic aberration of magnification of light with wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, 470 nm, and 435 nm after passing through the imaging optical lens 40 of the fourth embodiment. Figure 16 FIG. 4 shows a schematic diagram of field curvature and distortion of light with a wavelength of 555 nm after passing through the imaging optical lens 40 of the fourth embodiment. Figure 16 The field curvature S is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction.

[0195] In the embodiment, the entrance pupil diameter ENPD of the photographing optical lens 40 is 0.208 mm, the image height IH of 1.0 field of view of the photographing optical lens 40 is 1.048 mm, the field of view FOV of 1.0 field of view of the photographing optical lens 40 is 140.77°, the aperture value Fno of the photographing optical lens 40 is 3.00, and the photographing optical lens 40 meets the design requirements of large field of view, large depth of field, and high-definition imaging.

[0196] (Fifth Embodiment)

[0197] The symbol meanings of the fifth embodiment are the same as those of the first embodiment.

[0198] Different from the first embodiment, the object side surface of the first lens L1 is concave at the paraxial region, and the object side surface of the third lens L3 is convex at the paraxial region.

[0199] Figure 17 The photographing optical lens 50 of the fifth embodiment of the present application is shown. Table 9 and Table 10 show the design data of the photographing optical lens 50 of the fifth embodiment of the present application.

[0200]

Table 9

[0201]

[0202] Table 10 shows the aspheric surface data of each lens in the photographing optical lens 50 of the fifth embodiment of the present application.

[0203]

Table 10

[0204]

[0205]

[0206] Figure 18 、 Figure 19 The axial aberration and the magnification chromatic aberration diagrams of light with wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, 470 nm, and 435 nm after passing through the photographing optical lens 50 of the fifth embodiment are shown. Figure 20 The field curvature and distortion diagrams of light with a wavelength of 555 nm after passing through the photographing optical lens 50 of the fifth embodiment are shown. Figure 20 The field curvature S is the sagittal direction field curvature, and T is the tangential direction field curvature.

[0207] In the embodiment, the entrance pupil diameter ENPD of the photographing optical lens 50 is 0.224 mm, the image height IH of 1.0 field of view of the photographing optical lens 50 is 1.048 mm, the field of view FOV of 1.0 field of view of the photographing optical lens 50 is 123.93°, the aperture value Fno of the photographing optical lens 50 is 3.36, and the photographing optical lens 50 meets the design requirements of large field of view, large depth of field, and high-definition imaging.

[0208] (Sixth Embodiment)

[0209] The symbol meanings of the sixth embodiment are the same as those of the first embodiment.

[0210] Different from the first embodiment, the object side surface of the first lens L1 is concave at the paraxial region, and the object side surface of the third lens L3 is convex at the paraxial region.

[0211] Figure 21 The photographing optical lens 60 of the sixth embodiment of the present application is shown. Table 11 and Table 12 show the design data of the photographing optical lens 60 of the sixth embodiment of the present application.

[0212]

Table 11

[0213]

[0214] Table 12 shows the aspheric surface data of each lens in the photographing optical lens 60 of the sixth embodiment of the present application.

[0215]

Table 12

[0216]

[0217]

[0218] Figure 22 、 Figure 23 The axial aberration and the magnification chromatic aberration schematic diagrams of light with wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, 470 nm, and 435 nm passing through the photographing optical lens 60 of the sixth embodiment are shown. Figure 24 The field curvature and the distortion schematic diagrams of light with a wavelength of 555 nm passing through the photographing optical lens 60 of the sixth embodiment are shown. Figure 24 The field curvature S is the sagittal direction field curvature, and T is the tangential direction field curvature.

[0219] In the embodiment, the entrance pupil diameter ENPD of the photographing optical lens 60 is 0.224 mm, the image height IH of 1.0 field of view of the photographing optical lens 60 is 1.048 mm, the field of view FOV of 1.0 field of view of the photographing optical lens 60 is 142.85°, the aperture value Fno of the photographing optical lens 60 is 2.19, and the photographing optical lens 60 meets the design requirements of large field of view, large depth of field, and high-definition imaging.

[0220] (seventh embodiment)

[0221] The symbol meanings of the seventh embodiment are the same as those of the first embodiment.

[0222] Different from the first embodiment, the object side surface of the third lens L3 is a convex surface at the near-axial portion.

[0223] Figure 25 The photographing optical lens 70 of the seventh embodiment of the present application is shown. Table 13, Table 14 show the design data of the photographing optical lens 70 of the seventh embodiment of the present application.

[0224]

Table 13

[0225]

[0226] Table 14 shows the aspheric surface data of each lens in the photographing optical lens 70 of the seventh embodiment of the present application.

[0227]

Table 14

[0228]

[0229]

[0230] Figure 26 、 Figure 27 The axial aberration and the magnification chromatic aberration schematic diagrams of the light with wavelengths of 655 nm, 610 nm, 555 nm, 510 nm, 470 nm, and 435 nm after passing through the photographing optical lens 70 of the seventh embodiment are shown. Figure 28 The field curvature and the distortion schematic diagrams of the light with a wavelength of 555 nm after passing through the photographing optical lens 70 of the seventh embodiment are shown. Figure 28 The field curvature S is the sagittal direction field curvature, and T is the tangential direction field curvature.

[0231] In the embodiment, the entrance pupil diameter ENPD of the photographing optical lens 70 is 0.204 mm, the image height IH of the photographing optical lens 70 at 1.0 field of view is 1.048 mm, the field of view FOV of the photographing optical lens 70 at 1.0 field of view is 140.06°, the aperture value Fno of the photographing optical lens 70 is 3.03, and the photographing optical lens 70 meets the design requirements of large field of view, large depth of field, and high-definition imaging.

[0232] Table 15 shows the values corresponding to the parameters specified in the various numerical values and conditional expressions in the first, second, third, fourth, fifth, sixth, and seventh embodiments.

[0233]

Table 15

[0234]

[0235] It is to be understood that the above-described embodiments are merely illustrative of the principles of the application and that numerous and various modifications can be effected thereto without departing from the spirit and scope of the application.

Claims

1. A camera optical lens characterized in that, The camera optical lens has four lenses, and the four 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, and a fourth lens with positive refractive power. 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 second lens is f2, the focal length of the third lens is f3, the focal length of the fourth lens is f4, the field of view angle of 1.0 field of view of the camera optical lens is FOV, the aperture value of the camera optical lens is Fno, the edge thickness of the optical effective diameter of the first lens is ET1, the on-axis thickness of the first lens is d1, 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, and the following condition formula is satisfied: -1.40≤f1 / f≤-1.15; 35.00≤FOV / Fno≤66.00; 2.00≤ET1 / d1≤2.90; 1.70≤f3 / f4≤3.20; 0.60≤(R3+R4) / f2≤2.

40.

2. The camera optical lens according to claim 1, wherein, The total optical length of the camera optical lens is TTL, and the following condition formula is satisfied: 5.50≤TTL / f≤7.

00.

3. The camera optical lens according to claim 1, wherein, At least one of the first lens, the second lens, the third lens and the fourth lens is made of glass.

4. The camera optical lens according to claim 1, characterized in that, The maximum value of the absolute value of the distortion in the 0.7 field of view of the camera optical lens is Dmax, and the following condition formula is satisfied: Dmax≤2.00%.

5. The camera optical lens according to claim 1, wherein, The image side surface of the first lens is concave at the paraxial region; The total optical length of the camera optical lens is TTL, 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, and the following condition formula is satisfied: 0.57≤(R1+R2) / (R1-R2)≤1.30; 0.08≤d1 / TTL≤0.

15.

6. The camera optical lens according to claim 1, characterized in that, The object side surface of the second lens is convex at the paraxial region, and the image side surface of the second lens is concave at the paraxial region; The total optical length of the camera optical lens is TTL, the on-axis thickness of the second lens is d3, and the following condition formula is satisfied: 2.09≤f2 / f≤3.99; -7.23≤(R3+R4) / (R3-R4)≤-1.89; 0.14≤d3 / TTL≤0.

30.

7. The camera optical lens according to claim 1, wherein, The image side surface of the third lens is convex at the paraxial region; The total optical length of the camera optical lens is TTL, the central curvature radius of the object side surface of the third lens is R5, the central curvature radius of the image side surface of the third lens is R6, and the on-axis thickness of the third lens is d5, and the following condition formula is satisfied: 3.56≤f3 / f≤5.39; -0.18≤(R5+R6) / (R5-R6)≤1.04; 0.07≤d5 / TTL≤0.

15.

8. The camera optical lens according to claim 1, characterized in that, The object side surface of the fourth lens is convex at the paraxial region, and the image side surface of the fourth lens is convex at the paraxial region; An optical total track length of the camera optical lens is TTL, a center curvature radius of a fourth lens object side is R7, a center curvature radius of a fourth lens image side is R8, an on-axis thickness of the fourth lens is d7, and the following conditional expressions are satisfied: 1.62 ≤ f4 / f ≤ 2.02; -0.16 ≤ (R7+R8) / (R7-R8) ≤ 0.71; 0.10 ≤ d7 / TTL ≤ 0.

23.

9. The camera optical lens according to claim 1, characterized in that, The following conditional expressions are satisfied: 2.19 ≤ Fno ≤ 3.37.

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