Camera optical lens including seven lenses of ++-+-+-refractive powers

Description

TECHNICAL FIELD

The present disclosure relates to the field of optical lens, and more particularly, to a camera optical lens suitable for handheld terminal devices, such as smart phones or digital cameras, and imaging devices, such as monitors or PC lenses.

BACKGROUND

With the emergence of smart phones in recent years, the demand for miniature camera lens is increasing day by day, but in general the photosensitive devices of camera lens are nothing more than Charge Coupled Device (CCD) or Complementary Metal-Oxide Semiconductor Sensor (CMOS sensor), and as the progress of the semiconductor manufacturing technology makes the pixel size of the photosensitive devices become smaller, plus the current development trend of electronic products towards better functions and thinner and smaller dimensions, miniature camera lenses with good imaging quality therefore have become a mainstream in the market. In order to obtain better imaging quality, the lens that is traditionally equipped in mobile phone cameras adopts a three-piece or four-piece lens structure. Also, with the development of technology and the increase of the diverse demands of users, and as the pixel area of photosensitive devices is becoming smaller and smaller and the requirement of the system on the imaging quality is improving constantly, the five-piece, six-piece and seven-piece lens structures gradually appear in lens designs. There is an urgent need for ultra-thin, wide-angle camera lenses with good optical characteristics and fully corrected chromatic aberration.

BRIEF DESCRIPTION OF DRAWINGS

Many aspects of the exemplary embodiment can be better understood with reference to the following drawings. The components in the drawings are not necessarily drawn to scale, the emphasis instead being placed upon clearly illustrating the principles of the present disclosure. Moreover, in the drawings, like reference numerals designate corresponding parts throughout the several views.

FIG. 1 is a schematic diagram of a structure of a camera optical lens in accordance with Embodiment 1 of the present disclosure;

FIG. 2 is a schematic diagram of a longitudinal aberration of the camera optical lens shown in FIG. 1;

FIG. 3 is a schematic diagram of a lateral color of the camera optical lens shown in FIG. 1;

FIG. 4 is a schematic diagram of a field curvature and a distortion of the camera optical lens shown in FIG. 1;

FIG. 5 is a schematic diagram of a structure of a camera optical lens in accordance with Embodiment 2 of the present disclosure;

FIG. 6 is a schematic diagram of a longitudinal aberration of the camera optical lens shown in FIG. 5;

FIG. 7 is a schematic diagram of a lateral color of the camera optical lens shown in FIG. 5;

FIG. 8 is a schematic diagram of a field curvature and a distortion of the camera optical lens shown in FIG. 5;

FIG. 9 is a schematic diagram of a structure of a camera optical lens in accordance with Embodiment 3 of the present disclosure;

FIG. 10 is a schematic diagram of a longitudinal aberration of the camera optical lens shown in FIG. 9;

FIG. 11 is a schematic diagram of a lateral color of the camera optical lens shown in FIG. 9; and

FIG. 12 is a schematic diagram of a field curvature and a distortion of the camera optical lens shown in FIG. 9.

DESCRIPTION OF EMBODIMENTS

The present disclosure will hereinafter be described in detail with reference to several exemplary embodiments. To make the technical problems to be solved, technical solutions and beneficial effects of the present disclosure more apparent, the present disclosure is described in further detail together with the figure and the embodiments. It should be understood the specific embodiments described hereby is only to explain the disclosure, not intended to limit the disclosure.

Embodiment 1

Referring to FIG. 1, the present disclosure provides a camera optical lens 10. FIG. 1 shows the camera optical lens 10 according to Embodiment 1 of the present disclosure. The camera optical lens 10 includes 7 lenses. Specifically, the camera optical lens 10 includes, from an object side to an image side, an aperture S1, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6 and a seventh lens L7. An optical element such as an optical filter GF can be arranged at an image side of the seventh lens L7.

The first lens L1 is made of a glass material, the second lens L2 is made of a glass material, the third lens L3 is made of a plastic material, the fourth lens L4 is made of a plastic material, the fifth lens L5 is made of a plastic material, the sixth lens L6 is made of a plastic material, and the seventh lens L7 is made of a plastic material.

Here, a focal length of the camera optical lens 10 is defined as f, and a focal length of the first lens L1 is defined as f1. The camera optical lens 10 should satisfy a condition of 1.51≤f1/f≤2.50, which specifies a ratio of the focal length f1 of the first lens L1 and the focal length f of the camera optical lens 10. If the lower limit of the specified value is exceeded, although it would facilitate development of ultra-thin lenses, the positive refractive power of the first lens L1 will be too strong, and thus it is difficult to correct the problem like an aberration and it is also unfavorable for development of wide-angle lenses. On the contrary, if the upper limit of the specified value is exceeded, the positive refractive power of the first lens L1 would become too weak, and it is then difficult to develop ultra-thin lenses. Preferably, 1.51≤f1/f≤2.35.

A refractive index of the first lens L1 is defined as n1, where 1.70≤n1≤2.20, which specifies the refractive index of the first lens L1. The refractive index within this range facilitates development of ultra-thin lenses, and also facilitates correction of the aberration. Preferably, 1.71≤n1≤2.03.

A focal length of the third lens L3 is defined as f3, and a focal length of the fourth lens L4 is defined as f4. The camera optical lens 10 should satisfy a condition of −2.00≤f3/f4≤0.00, which specifies a ratio of the focal length f3 of the third lens L3 and the focal length f4 of the fourth lens L4. This can effectively reduce the sensitivity of optical lens group used in the camera and further enhance the imaging quality. Preferably, −1.93≤f3/f4≤−0.40.

A curvature radius of an object side surface of the seventh lens L7 is defined as R13, and a curvature radius of an image side surface of the seventh lens L7 is defined as R14. The camera optical lens 10 further satisfies a condition of 3.00≤(R13+R14)/(R13−R14)≤10.00, which specifies a shape of the seventh lens L7. Within this range, a development towards ultra-thin and wide-angle lenses would facilitate correcting the problem like an off-axis aberration. Preferably, 3.05≤(R13+R14)/(R13−R14)≤9.95.

A refractive index of the second lens L2 is defined as n2, where 1.70≤n2≤2.20, which specifies the refractive index of the second lens L2. The refractive index within this range facilitates development of ultra-thin lenses, and also facilitates correction of the aberration. Preferably, 1.75≤n2≤2.16.

A total optical length from an object side surface of the first lens L1 to an image plane of the camera optical lens 10 along an optic axis is defined as TTL. When the focal length of the camera optical lens, the focal length of the first lens, the focal length of the third lens, the focal length of the fourth lens, the refractive index of the first lens, the refractive index of the second lens, the on-axis thickness of the second lens, the curvature radius of the object side surface of the seventh lens and the curvature radius of the image side surface of the seventh lens satisfy the above conditions, the camera optical lens will have the advantage of high performance and satisfy the design requirement of a low TTL.

In this embodiment, the object side surface of the first lens L1 is convex in a paraxial region, an image side surface of the first lens L1 is concave in the paraxial region, and the first lens L1 has a positive refractive power.

A curvature radius of the object side surface of the first lens L1 is defined as R1, and a curvature radius of the image side surface of the first lens L1 is defined as R2. The camera optical lens 10 further satisfies a condition of −15.75≤(R1+R2)/(R1−R2)≤−2.87. This can reasonably control a shape of the first lens L1 in such a manner that the first lens L1 can effectively correct a spherical aberration of the camera optical lens. Preferably, (R1+R2)/(R1−R2)≤−3.59.

An on-axis thickness of the first lens L1 is defined as d1. The camera optical lens 10 further satisfies a condition of 0.05≤d1/TTL≤0.19. This facilitates achieving ultra-thin lenses. Preferably, 0.07≤d1/TTL≤0.15.

In this embodiment, an object side surface of the second lens L2 is convex in the paraxial region, an image side surface of the second lens L2 is convex in the paraxial region, and the second lens L2 has a positive refractive power.

The focal length of the camera optical lens 10 is f, and a focal length of the second lens L2 is f2. The camera optical lens 10 further satisfies a condition of 3.83≤f2/f≤1092.97. By controlling the positive refractive power of the second lens L2 within the reasonable range, correction of the aberration of the optical system can be facilitated. Preferably, 6.13≤f2/f≤874.37.

A curvature radius of the object side surface of the second lens L2 is defined as R3, and a curvature radius of the image side surface of the second lens L2 is defined as R4. The camera optical lens 10 further satisfies a condition of −179.19≤(R3+R4)/(R3−R4)≤55.93, which specifies a shape of the second lens L2. Within this range, a development towards ultra-thin and wide-angle lenses would facilitate correcting the problem of an on-axis chromatic aberration. Preferably, −111.99≤(R3+R4)/(R3−R4)≤44.74

An on-axis thickness of the second lens L2 is defined as d3. The camera optical lens 10 further satisfies a condition of 0.03≤d3/TTL≤0.09. This facilitates achieving ultra-thin lenses. Preferably, 0.04≤d3/TTL≤0.07.

In this embodiment, an object side surface of the third lens L3 is convex in the paraxial region, an image side surface of the third lens L3 is concave in the paraxial region, and the third lens L3 has a negative refractive power.

The focal length of the camera optical lens 10 is f, and a focal length of the third lens L3 is f3. The camera optical lens 10 further satisfies a condition of −8.26≤f3/f≤−1.73. The appropriate distribution of the refractive power leads to a better imaging quality and a lower sensitivity. Preferably, −5.16≤f3/f≤−2.16.

A curvature radius of the object side surface of the third lens L3 is defined as R5, and a curvature radius of the image side surface of the third lens L3 is defined as R6. The camera optical lens 10 further satisfies a condition of 0.84≤(R5+R6)/(R5−R6)≤3.37. This can effectively control a shape of the third lens L3, thereby facilitating shaping of the third lens L3 and avoiding bad shaping and generation of stress due to the overly large surface curvature of the third lens L3. Preferably, 1.35≤(R5+R6)/(R5−R6)≤2.70.

An on-axis thickness of the third lens L3 is defined as d5. The camera optical lens 10 further satisfies a condition of 0.03≤d5/TTL≤0.09. This facilitates achieving ultra-thin lenses. Preferably, 0.04≤d5/TTL≤0.07.

In this embodiment, an object side surface of the fourth lens L4 is convex in the paraxial region, an image side surface of the fourth lens L4 is convex in the paraxial region, and the fourth lens L4 has a positive refractive power.

The focal length of the camera optical lens 10 is f, and a focal length of the fourth lens L4 is f4. The camera optical lens 10 further satisfies a condition of 1.11≤f4/f≤4.90. The appropriate distribution of the refractive power leads to a better imaging quality and a lower sensitivity. Preferably, 1.77≤f4/f≤3.92.

A curvature radius of the object side surface of the fourth lens L4 is defined as R7, and a curvature radius of the image side surface of the fourth lens L4 is defined as R8. The camera optical lens 10 further satisfies a condition of −1.37≤(R7+R8)/(R7−R8)≤0.83, which specifies a shape of the fourth lens L4. Within this range, a development towards ultra-thin and wide-angle lenses would facilitate correcting the problem like an off-axis aberration. Preferably, −0.86≤(R7+R8)/(R7−R8)≤0.66.

An on-axis thickness of the fourth lens L4 is defined as d7. The camera optical lens 10 further satisfies a condition of 0.05≤d7/TTL≤0.17. This facilitates achieving ultra-thin lenses. Preferably, 0.08≤d7/TTL≤0.14.

In this embodiment, an object side surface of the fifth lens L5 is convex in the paraxial region, an image side surface of the fifth lens L5 is concave in the paraxial region, and the fifth lens L5 has a negative refractive power.

The focal length of the camera optical lens 10 is f, and a focal length of the fifth lens L5 is f5. The camera optical lens 10 further satisfies a condition of −6.34≤f5/f≤−1.61. This can effectively make a light angle of the camera lens gentle and reduce the tolerance sensitivity. Preferably, −3.96≤f5/f≤−2.01.

A curvature radius of the object side surface of the fifth lens L5 is defined as R9, and a curvature radius of the image side surface of the fifth lens L5 is defined as R10. The camera optical lens 10 further satisfies a condition of 1.83≤(R9+R10)/(R9−R10)≤10.06, which specifies a shape of the fifth lens L5. Within this range, a development towards ultra-thin and wide-angle lenses would facilitate correcting the problem like an off-axis aberration. Preferably, 2.93≤(R9+R10)/(R9−R10)≤8.05.

An on-axis thickness of the fifth lens L5 is defined as d9. The camera optical lens 10 further satisfies a condition of 0.03≤d9/TTL≤0.10. This facilitates achieving ultra-thin lenses. Preferably, 0.04≤d9/TTL≤0.08.

In this embodiment, an object side surface of the sixth lens L6 is convex in the paraxial region, an image side surface of the sixth lens L6 is concave in the paraxial region, and the sixth lens L6 has a positive refractive power.

The focal length of the camera optical lens 10 is f, and a focal length of the sixth lens L6 is f6. The camera optical lens 10 further satisfies a condition of 0.56≤f6/f≤1.73. The appropriate distribution of the refractive power leads to a better imaging quality and a lower sensitivity. Preferably, 0.89≤f6/f≤1.39.

A curvature radius of the object side surface of the sixth lens L6 is defined as R11, and a curvature radius of the image side surface of the sixth lens L6 is defined as R12. The camera optical lens 10 further satisfies a condition of −4.44≤(R11+R12)/(R11−R12)≤−0.95, which specifies a shape of the sixth lens L6. Within this range, a development towards ultra-thin and wide-angle lenses would facilitate correcting the problem like an off-axis aberration. Preferably, −2.77≤(R11+R12)/(R11−R12)≤−1.18.

A thickness on-axis of the sixth lens L6 is defined as d11. The camera optical lens 10 further satisfies a condition of 0.03≤d11/TTL≤0.12. This facilitates achieving ultra-thin lenses. Preferably, 0.05≤d11/TTL≤0.09.

In this embodiment, an object side surface of the seventh lens L7 is convex in the paraxial region, an image side surface of the seventh lens L7 is concave in the paraxial region, and the seventh lens L7 has a negative refractive power.

The focal length of the camera optical lens 10 is f, and a focal length of the seventh lens L7 is f7. The camera optical lens 10 further satisfies a condition of −30.53≤f7/f≤−1.09. The appropriate distribution of the refractive power leads to a better imaging quality and a lower sensitivity. Preferably, −19.08≤f7/f≤−1.36.

An on-axis thickness of the seventh lens L7 is defined as d13. The camera optical lens 10 further satisfies a condition of 0.07≤d13/TTL≤0.20. This facilitates achieving ultra-thin lenses. Preferably, 0.10≤d13/TTL≤0.16.

In this embodiment, the total optical length TTL of the camera optical lens 10 is smaller than or equal to 7.13 mm, which is beneficial for achieving ultra-thin lenses. Preferably, the total optical length TTL of the camera optical lens 10 is smaller than or equal to 6.80 mm.

In this embodiment, an F number of the camera optical lens 10 is smaller than or equal to 1.60. The camera optical lens 10 has a large F number and a better imaging performance. Preferably, the F number of the camera optical lens 10 is smaller than or equal to 1.57.

With such design, the total optical length TTL of the camera optical lens 10 can be made as short as possible, and thus the miniaturization characteristics can be maintained.

In the following, examples will be used to describe the camera optical lens 10 of the present disclosure. The symbols recorded in each example will be described as follows. The focal length, on-axis distance, curvature radius, on-axis thickness, inflexion point position, and arrest point position are all in units of mm.

TTL: Optical length (the total optical length from the object side surface of the first lens to the image plane of the camera optical lens along the optic axis) in mm.

Preferably, inflexion points and/or arrest points can be arranged on the object side surface and/or image side surface of the lens, so as to satisfy the demand for the high quality imaging. The description below can be referred to for specific implementations.

The design information of the camera optical lens 10 in Embodiment 1 of the present disclosure is shown in Tables 1 and 2.

TABLE 1

R
d
nd
νd

S1
∞
d0=
−0.520

R1
2.428
d1=
0.787
nd1
1.7154
ν1
53.87

R2
3.898
d2=
0.039

R3
3.157
d3=
0.317
nd2
2.1157
ν2
17.02

R4
2.992
d4=
0.573

R5
21.196
d5=
0.324
nd3
1.6667
ν3
20.53

R6
8.143
d6=
0.067

R7
25.963
d7=
0.728
nd4
1.5462
ν4
55.82

R8
−7.483
d8=
0.325

R9
5.317
d9=
0.328
nd5
1.6407
ν5
23.82

R10
3.034
d10=
0.100

R11
2.562
d11=
0.419
nd6
1.5462
ν6
55.82

R12
14.768
d12=
0.200

R13
3.335
d13=
0.819
nd7
1.5363
ν7
55.69

R14
1.708
d14=
0.535

R15
∞
d15=
0.210
ndg
1.5168
νg
64.17

R16
∞
d16=
0.489

In the table, meanings of various symbols will be described as follows.

S1: aperture;

R: curvature radius of an optical surface, a central curvature radius for a lens;

R1: curvature radius of the object side surface of the first lens L1;

R2: curvature radius of the image side surface of the first lens L1;

R3: curvature radius of the object side surface of the second lens L2;

R4: curvature radius of the image side surface of the second lens L2;

R5: curvature radius of the object side surface of the third lens L3;

R6: curvature radius of the image side surface of the third lens L3;

R7: curvature radius of the object side surface of the fourth lens L4;

R8: curvature radius of the image side surface of the fourth lens L4;

R9: curvature radius of the object side surface of the fifth lens L5;

R10: curvature radius of the image side surface of the fifth lens L5;

R11: curvature radius of the object side surface of the sixth lens L6;

R12: curvature radius of the image side surface of the sixth lens L6;

R13: curvature radius of the object side surface of the seventh lens L7;

R14: curvature radius of the image side surface of the seventh lens L7;

R15: curvature radius of an object side surface of the optical filter GF;

R16: curvature radius of an image side surface of the optical filter GF;

d: on-axis thickness of a lens and an on-axis distance between lenses;

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

d1: on-axis thickness of the first lens L1;

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

d3: on-axis thickness of the second lens L2;

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

d5: on-axis thickness of the third lens L3;

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

d7: on-axis thickness of the fourth lens L4;

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

d9: on-axis thickness of the fifth lens L5;

d10: on-axis distance from the image side surface of the fifth lens L5 to the object side surface of the sixth lens L6;

d11: on-axis thickness of the sixth lens L6;

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

d13: on-axis thickness of the seventh lens L7;

d14: on-axis distance from the image side surface of the seventh lens L7 to the object side surface of the optical filter GF;

d15: on-axis thickness of the optical filter GF;

d16: on-axis distance from the image side surface of the optical filter GF to the image plane;

nd: refractive index of d line;

nd1: refractive index of d line of the first lens L1;

nd2: refractive index of d line of the second lens L2;

nd3: refractive index of d line of the third lens L3;

nd4: refractive index of d line of the fourth lens L4;

nd5: refractive index of d line of the fifth lens L5;

nd6: refractive index of d line of the sixth lens L6;

nd7: refractive index of d line of the seventh lens L7;

ndg: refractive index of d line of the optical filter GF;

vd: abbe number;

v1: abbe number of the first lens L1;

v2: abbe number of the second lens L2;

v3: abbe number of the third lens L3;

v4: abbe number of the fourth lens L4;

v5: abbe number of the fifth lens L5;

v6: abbe number of the sixth lens L6;

v7: abbe number of the seventh lens L7;

vg: abbe number of the optical filter GF.

Table 2 shows aspherical surface data of the camera optical lens 10 in Embodiment 1 of the present disclosure.

TABLE 2

Conic coefficient
Aspherical surface coefficients

k
A4
A6
A8
A10
A12
A14
A16

R1
6.5252E−01
−5.2061E−03
−3.3032E−03
−6.0404E−04
1.0283E−03
−7.1648E−04
1.9145E−04
−2.8388E−05

R2
−3.9936E+01
−3.2080E−02
3.6713E−02
−1.9447E−02
5.4669E−03
−1.3494E−03
4.0459E−04
−6.6115E−05

R3
2.2356E+00
−7.2573E−02
5.7600E−02
−3.2488E−02
1.1885E−02
−4.3069E−03
1.3603E−03
−1.7778E−04

R4
3.8455E+00
−3.5469E−03
−3.2757E−02
6.9403E−02
−9.8536E−02
7.5138E−02
−3.1265E−02
5.2322E−03

R5
2.5534E+02
−6.9241E−02
6.6726E−02
−1.6015E−01
1.7825E−01
−1.1686E−01
3.8458E−02
−4.1626E−03

R6
−1.8423E+02
−5.9523E−02
1.0296E−01
−1.9719E−01
1.8147E−01
−9.9538E−02
3.1880E−02
−4.2899E−03

R7
−3.7657E+01
−5.9902E−02
9.3536E−02
−1.1315E−01
6.7521E−02
−1.8768E−02
2.2719E−03
−8.0177E−05

R8
8.7194E+00
−6.5215E−02
3.9119E−02
−3.0521E−02
1.1228E−02
6.0362E−04
−1.5658E−03
3.0329E−04

R9
−2.9242E+02
−1.6322E−02
−1.2811E−02
3.9215E−02
−4.2069E−02
1.8804E−02
−3.9140E−03
3.1575E−04

R10
−5.1553E+01
−1.0717E−01
5.5084E−02
1.5203E−02
−3.2545E−02
1.4381E−02
−2.6899E−03
1.8696E−04

R11
−1.1159E+01
2.1657E−02
−1.0535E−01
9.0270E−02
−4.1271E−02
9.8107E−03
−1.1588E−03
5.5101E−05

R12
−2.9744E+02
7.9990E−02
−1.2748E−01
7.5812E−02
−2.5284E−02
4.7347E−03
−4.5798E−04
1.7777E−05

R13
−4.0441E+01
−1.4822E−01
4.7241E−02
−5.0289E−03
−1.8115E−04
8.7000E−05
−7.0428E−06
1.8305E−07

R14
−5.9223E+00
−8.4923E−02
3.4835E−02
−8.3018E−03
1.1666E−03
−9.6559E−05
4.4009E−06
−8.6169E−08

Here, K is a conic coefficient, and A4, A6, A8, A10, A12, A14 and A16 are aspheric surface coefficients.

IH: Image Height

y=(x²/R)/[1+{1−(k+1)(x²/R²)}^1/2]+A4x⁴+A6x⁶+A8x⁸+A10x¹⁰+A12x¹²+A14x¹⁴+A16x¹⁶ (1)

For convenience, an aspheric surface of each lens surface uses the aspheric surfaces shown in the above formula (1). However, the present disclosure is not limited to the aspherical polynomials form shown in the formula (1).

Table 3 and Table 4 show design data of inflexion points and arrest points of respective lens in the camera optical lens 10 according to Embodiment 1 of the present disclosure. P1R1 and P1R2 represent the object side surface and the image side surface of the first lens L1, P2R1 and P2R2 represent the object side surface and the image side surface of the second lens L2, P3R1 and P3R2 represent the object side surface and the image side surface of the third lens L3, P4R1 and P4R2 represent the object side surface and the image side surface of the fourth lens L4, P5R1 and P5R2 represent the object side surface and the image side surface of the fifth lens L5, P6R1 and P6R2 represent the object side surface and the image side surface of the sixth lens L6, and P7R1 and P7R2 represent the object side surface and the image side surface of the seventh lens L7. The data in the column named “inflexion point position” refers to vertical distances from inflexion points arranged on each lens surface to the optic axis of the camera optical lens 10. The data in the column named “arrest point position” refers to vertical distances from arrest points arranged on each lens surface to the optic axis of the camera optical lens 10.

TABLE 3

Number of
Inflexion
Inflexion
Inflexion

inflexion points
point position 1
point position 2
point position 3

P1R1
1
1.575
0
0

P1R2
1
1.135
0
0

P2R1
0
0
0
0

P2R2
0
0
0
0

P3R1
2
0.265
1.215
0

P3R2
2
0.405
1.225
0

P4R1
2
0.265
1.165
0

P4R2
1
1.565
0
0

P5R1
2
0.435
1.835
0

P5R2
2
0.375
2.005
0

P6R1
2
0.665
1.925
0

P6R2
2
0.675
1.965
0

P7R1
3
0.335
1.475
2.555

P7R2
1
0.635
0
0

TABLE 4

Number of
Arrest point
Arrest point
Arrest point

arrest points
position 1
position 2
position 3

P1R1
0
0
0
0

P1R2
0
0
0
0

P2R1
0
0
0
0

P2R2
0
0
0
0

P3R1
1
0.465
0
0

P3R2
2
0.705
1.405
0

P4R1
2
0.515
1.375
0

P4R2
0
0
0
0

P5R1
1
0.935
0
0

P5R2
1
0.835
0
0

P6R1
1
1.215
0
0

P6R2
2
1.015
2.435
0

P7R1
3
0.635
2.345
2.685

P7R2
1
1.825
0
0

FIG. 2 and FIG. 3 illustrate a longitudinal aberration and a lateral color of light with wavelengths of 650 nm, 610 nm, 555 nm, 510 nm and 470 nm after passing the camera optical lens 10 according to Embodiment 1. FIG. 4 illustrates a field curvature and a distortion of light with a wavelength of 555 nm after passing the camera optical lens 10 according to Embodiment 1, in which a field curvature S is a field curvature in a sagittal direction and T is a field curvature in a tangential direction.

Table 13 shows various values of Embodiments 1, 2 and 3 and values corresponding to parameters which are specified in the above conditions.

As shown in Table 13, Embodiment 1 satisfies the above conditions.

In this embodiment, the entrance pupil diameter of the camera optical lens is 3.128 mm. The image height of 1.0H is 4.00 mm. The FOV (field of view) is 77.99°. Thus, the camera optical lens has a wide-angle and is ultra-thin. Its on-axis and off-axis chromatic aberrations are fully corrected, thereby achieving excellent optical characteristics.

Embodiment 2

Embodiment 2 is basically the same as Embodiment 1 and involves symbols having the same meanings as Embodiment 1, and only differences therebetween will be described in the following.

Table 5 and Table 6 show design data of a camera optical lens 20 in Embodiment 2 of the present disclosure.

TABLE 5

R
d
nd
νd

S1
∞
d0=
−0.392

R1
2.718
d1=
0.645
nd1
1.8550
ν1
32.17

R2
3.600
d2=
0.040

R3
2.895
d3=
0.387
nd2
1.9316
ν2
18.90

R4
2.960
d4=
0.612

R5
23.663
d5=
0.351
nd3
1.6667
ν3
20.53

R6
6.074
d6=
0.045

R7
8.445
d7=
0.659
nd4
1.5462
ν4
55.82

R8
−29.754
d8=
0.314

R9
3.516
d9=
0.427
nd5
1.6407
ν5
23.82

R10
2.369
d10=
0.091

R11
2.171
d11=
0.438
nd6
1.54618
ν6
55.82

R12
7.954
d12=
0.236

R13
2.575
d13=
0.830
nd7
1.5363
ν7
55.69

R14
1.839
d14=
0.535

R15
∞
d15=
0.210
ndg
1.5168
νg
64.17

R16
∞
d16=
0.554

Table 6 shows aspherical surface data of each lens of the camera optical lens 20 in Embodiment 2 of the present disclosure.

TABLE 6

Conic coefficient
Aspherical surface coefficients

k
A4
A6
A8
A10
A12
A14
A16

R1
7.6412E−01
−5.9288E−03
−3.2688E−03
−2.6464E−04
9.8802E−04
−7.9338E−04
1.8301E−04
−1.6952E−05

R2
−2.2453E+01
−3.5097E−02
3.2685E−02
−1.8574E−02
5.9936E−03
−1.4698E−03
2.6709E−04
−2.1765E−05

R3
8.9631E−01
−8.8867E−02
6.2223E−02
−3.1382E−02
1.1266E−02
−4.3343E−03
1.4660E−03
−1.8895E−04

R4
3.4645E+00
−1.4360E−02
−2.2438E−02
6.1398E−02
−9.7361E−02
7.6308E−02
−3.1444E−02
5.2324E−03

R5
3.7972E+01
−6.5532E−02
6.7125E−02
−1.5953E−01
1.7565E−01
−1.1580E−01
3.9593E−02
−4.7173E−03

R6
−2.0211E+02
−6.1463E−02
1.0055E−01
−1.9888E−01
1.8185E−01
−9.9322E−02
3.1751E−02
−4.2636E−03

R7
−9.7090E+01
−6.3613E−02
9.3837E−02
−1.1338E−01
6.7170E−02
−1.8840E−02
2.3713E−03
−8.9658E−05

R8
1.6936E+02
−6.9521E−02
3.9313E−02
−3.0475E−02
1.1131E−02
5.6944E−04
−1.5632E−03
3.0407E−04

R9
−1.2379E+02
−9.4485E−03
−1.2943E−02
3.9206E−02
−4.2061E−02
1.8808E−02
−3.9134E−03
3.1506E−04

R10
−3.9782E+01
−1.0835E−01
5.5090E−02
1.5211E−02
−3.2549E−02
1.4379E−02
−2.6906E−03
1.8688E−04

R11
−9.2090E+00
2.2870E−02
−1.0578E−01
9.0167E−02
−4.1290E−02
9.8076E−03
−1.1592E−03
5.5246E−05

R12
−3.1400E+02
8.0768E−02
−1.2741E−01
7.5822E−02
−2.5284E−02
4.7347E−03
−4.5799E−04
1.7764E−05

R13
−3.1837E+01
−1.4865E−01
4.7230E−02
−5.0272E−03
−1.8043E−04
8.7080E−05
−7.0366E−06
1.8285E−07

R14
−6.3305E+00
−8.4689E−02
3.4876E−02
−8.3007E−03
1.1666E−03
−9.6560E−05
4.4014E−06
−8.6072E−08

Table 7 and table 8 show design data of inflexion points and arrest points of respective lens in the camera optical lens 20 according to Embodiment 2 of the present disclosure.

TABLE 7

Number of
Inflexion
Inflexion
Inflexion

inflexion points
point position 1
point position 2
point position 3

P1R1
1
1.425
0
0

P1R2
1
0.925
0
0

P2R1
0
0
0
0

P2R2
0
0
0
0

P3R1
2
0.255
1.235
0

P3R2
2
0.385
1.255
0

P4R1
2
0.455
1.215
0

P4R2
1
1.585
0
0

P5R1
2
0.555
1.835
0

P5R2
2
0.385
2.035
0

P6R1
2
0.675
1.965
0

P6R2
2
0.665
1.955
0

P7R1
3
0.355
1.475
2.665

P7R2
1
0.635
0
0

TABLE 8

Number of
Arrest point
Arrest point
Arrest point

arrest points
position 1
position 2
position 3

P1R1
0
0
0
0

P1R2
0
0
0
0

P2R1
0
0
0
0

P2R2
0
0
0
0

P3R1
1
0.435
0
0

P3R2
1
0.695
0
0

P4R1
2
0.835
1.415
0

P4R2
0
0
0
0

P5R1
1
1.115
0
0

P5R2
1
0.925
0
0

P6R1
1
1.255
0
0

P6R2
2
1.045
2.435
0

P7R1
3
0.685
2.275
2.855

P7R2
1
1.785
0
0

FIG. 6 and FIG. 7 illustrate a longitudinal aberration and a lateral color of light with wavelengths of 650 nm, 610 nm, 555 nm, 510 nm and 470 nm after passing the camera optical lens 20 according to Embodiment 2. FIG. 8 illustrates a field curvature and a distortion of light with a wavelength of 555 nm after passing the camera optical lens 20 according to Embodiment 2.

As shown in Table 13, Embodiment 2 satisfies the above conditions.

In this embodiment, the entrance pupil diameter of the camera optical lens is 3.073 mm. The image height of 1.0H is 4.00 mm. The FOV (field of view) is 79.14°. Thus, the camera optical lens has a wide-angle and is ultra-thin. Its on-axis and off-axis chromatic aberrations are fully corrected, thereby achieving excellent optical characteristics.

Embodiment 3

Embodiment 3 is basically the same as Embodiment 1 and involves symbols having the same meanings as Embodiment 1, and only differences therebetween will be described in the following.

The first lens L1 is made of a glass material, the second lens L2 is made of a plastic material, the third lens L3 is made of a plastic material, the fourth lens L4 is made of a plastic material, the fifth lens L5 is made of a plastic material, the sixth lens L6 is made of a plastic material, and the seventh lens L7 is made of a plastic material.

Table 9 and Table 10 show design data of a camera optical lens 30 in Embodiment 3 of the present disclosure.

TABLE 9

R
d
nd
νd

S1
∞
d0=
−0.440

R1
2.724
d1=
0.605
nd1
1.8550
ν1
32.17

R2
3.516
d2=
0.040

R3
2.916
d3=
0.403
nd2
1.7902
ν2
25.75

R4
2.989
d4=
0.584

R5
23.814
d5=
0.386
nd3
1.6667
ν3
20.53

R6
6.093
d6=
0.045

R7
10.017
d7=
0.674
nd4
1.5462
ν4
55.82

R8
−53.883
d8=
0.236

R9
2.646
d9=
0.383
nd5
1.6407
ν5
23.82

R10
1.959
d10=
0.115

R11
1.919
d11=
0.512
nd6
1.5462
ν6
55.82

R12
5.068
d12=
0.214

R13
2.136
d13=
0.849
nd7
1.5363
ν7
55.69

R14
1.744
d14=
0.535

R15
∞
d15=
0.210
ndg
1.5168
νg
64.17

R16
∞
d16=
0.687

Table 10 shows aspherical surface data of each lens of the camera optical lens 30 in Embodiment 3 of the present disclosure.

TABLE 10

Conic coefficient
Aspherical surface coefficients

k
A4
A6
A8
A10
A12
A14
A16

R1
8.1930E−01
−5.1742E−03
−2.8479E−03
−1.5153E−04
1.0122E−03
−7.8917E−04
1.8222E−04
−1.7631E−05

R2
−2.2308E+01
−3.5521E−02
3.3075E−02
−1.8365E−02
6.0410E−03
−1.4643E−03
2.6620E−04
−2.4018E−05

R3
4.4445E−01
−9.5367E−02
6.2222E−02
−3.1016E−02
1.1503E−02
−4.2707E−03
1.4544E−03
−2.0744E−04

R4
3.5795E+00
−1.7200E−02
−2.2472E−02
6.1952E−02
−9.7454E−02
7.6109E−02
−3.1493E−02
5.3136E−03

R5
7.3295E+01
−6.5070E−02
6.9685E−02
−1.6084E−01
1.7475E−01
−1.1567E−01
3.9849E−02
−4.7532E−03

R6
−2.0040E+02
−6.1337E−02
1.0024E−01
−1.9885E−01
1.8181E−01
−9.9446E−02
3.1698E−02
−4.2334E−03

R7
−1.9556E+02
−6.5179E−02
9.3887E−02
−1.1321E−01
6.7246E−02
−1.8825E−02
2.3684E−03
−9.3794E−05

R8
3.5738E+02
−7.5412E−02
3.9487E−02
−3.0308E−02
1.1164E−02
5.7531E−04
−1.5632E−03
3.0079E−04

R9
−1.2642E+02
−8.6263E−03
−1.3603E−02
3.9098E−02
−4.2061E−02
1.8815E−02
−3.9109E−03
3.1538E−04

R10
−3.6873E+01
−1.0740E−01
5.5458E−02
1.5257E−02
−3.2546E−02
1.4378E−02
−2.6911E−03
1.8665E−04

R11
−8.7910E+00
2.5416E−02
−1.0535E−01
9.0206E−02
−4.1291E−02
9.8058E−03
−1.1599E−03
5.5034E−05

R12
−3.4778E+02
8.1064E−02
−1.2737E−01
7.5828E−02
−2.5283E−02
4.7347E−03
−4.5802E−04
1.7767E−05

R13
−2.3143E+01
−1.4872E−01
4.7238E−02
−5.0247E−03
−1.8029E−04
8.6997E−05
−7.0514E−06
1.8434E−07

R14
−6.5809E+00
−8.4203E−02
3.4891E−02
−8.3001E−03
1.1666E−03
−9.6568E−05
4.4002E−06
−8.6135E−08

Table 11 and table 12 show design data of inflexion points and arrest points of respective lens in the camera optical lens 30 according to Embodiment 3 of the present disclosure.

TABLE 11

Number of
Inflexion
Inflexion
Inflexion

inflexion points
point position 1
point position 2
point position 3

P1R1
1
1.485
0
0

P1R2
1
0.985
0
0

P2R1
0
0
0
0

P2R2
0
0
0
0

P3R1
2
0.255
1.235
0

P3R2
2
0.385
1.265
0

P4R1
2
0.375
1.205
0

P4R2
1
1.595
0
0

P5R1
2
0.505
1.815
0

P5R2
2
0.375
2.045
0

P6R1
2
0.695
2.015
0

P6R2
2
0.645
1.945
0

P7R1
3
0.375
1.475
2.635

P7R2
1
0.625
0
0

TABLE 12

Number of
Arrest point
Arrest point
Arrest point

arrest points
position 1
position 2
position 2

P1R1
0
0
0
0

P1R2
0
0
0
0

P2R1
0
0
0
0

P2R2
0
0
0
0

P3R1
1
0.445
0
0

P3R2
1
0.695
0
0

P4R1
2
0.725
1.425
0

P4R2
0
0
0
0

P5R1
1
1.105
0
0

P5R2
1
0.985
0
0

P6R1
1
1.305
0
0

P6R2
2
1.045
2.365
0

P7R1
3
0.735
2.225
2.835

P7R2
1
1.835
0
0

FIG. 10 and FIG. 11 illustrate a longitudinal aberration and a lateral color of light with wavelengths of 650 nm, 610 nm, 555 nm, 510 nm and 470 nm after passing the camera optical lens 30 according to Embodiment 3. FIG. 12 illustrates field curvature and distortion of light with a wavelength of 555 nm after passing the camera optical lens 30 according to Embodiment 3.

As shown in Table 13, Embodiment 3 satisfies the above conditions.

Table 13 in the following lists values corresponding to the respective conditions in this embodiment in order to satisfy the above conditions.

In this embodiment, the entrance pupil diameter of the camera optical lens is 3.068 mm. The image height of 1.0H is 4.00 mm. The FOV (field of view) is 79.04°. Thus, the camera optical lens has a wide-angle and is ultra-thin. Its on-axis and off-axis chromatic aberrations are fully corrected, thereby achieving excellent optical characteristics.

TABLE 13

Parameters

and conditions
Embodiment 1
Embodiment 2
Embodiment 3

f
4.848
4.763
4.755

f1
7.355
9.703
10.460

f2
3532.697
36.528
43.990

f3
−20.032
−12.355
−12.388

f4
10.718
12.117
15.524

f5
−11.682
−13.255
−15.069

f6
5.607
5.324
5.345

f7
−7.921
−19.800
−72.578

f12
6.953
7.472
8.223

FNO
1.55
1.55
1.55

f1/f
1.52
2.04
2.20

n1
1.72
1.86
1.86

f3/f4
−1.87
−1.02
−0.80

(R13 + R14)/
3.10
6.00
9.90

(R13 − R14)

n2
2.12
1.93
1.79

It can be appreciated by one having ordinary skill in the art that the description above is only embodiments of the present disclosure. In practice, one having ordinary skill in the art can make various modifications to these embodiments in forms and details without departing from the spirit and scope of the present disclosure.

Claims

1. A camera optical lens, comprising, from an object side to an image side: a first lens having a positive refractive power;a second lens having a positive refractive power;a third lens having a negative refractive power;a fourth lens having a positive refractive power;a fifth lens having a negative refractive power;a sixth lens having a positive refractive power;and a seventh lens having a negative refractive power,wherein the camera optical lens satisfies following conditions: 1.51≤f1/f≤2.50;−2.00≤f3/f4≤0.00;3.00≤(R13+R14)/(R13−R14)≤10.00; and1.70≤n2≤2.20,Wheref denotes a focal length of the camera optical lens;f1 denotes a focal length of the first lens;f3 denotes a focal length of the third lens;f4 denotes a focal length of the fourth lens;n1 denote a refractive index of the first lens;n2 denote a refractive index of the second lens;d3 denotes an on-axis thickness of the second lens;R13 denotes a curvature radius of an object side surface of the seventh lens; andR14 denotes a curvature radius of an image side surface of the seventh lens.
2. The camera optical lens as described in claim 1, further satisfying following conditions: 1.51≤f1/f≤2.35;1.71≤n1≤2.03,−1.93≤f3/f4≤−0.40;3.05≤(R13+R14)/(R13−R14)≤9.95; and1.75≤n2≤2.16.
3. The camera optical lens as described in claim 1, wherein the first lens comprises an object side surface being convex in a paraxial region and an image side surface being concave in the paraxial region, and the camera optical lens further satisfies following conditions: −15.75≤(R1+R2)/(R1−R2)≤−2.87; and0.05≤d1/TTL≤0.19,WhereR1 denotes a curvature radius of the object side surface of the first lens;R2 denotes a curvature radius of the image side surface of the first lens;d1 denotes an on-axis thickness of the first lens; andTTL denotes a total optical length from the object side surface of the first lens to an image plane of the camera optical lens along an optic axis.
4. The camera optical lens as described in claim 3, further satisfying following conditions: −9.85≤(R1+R2)/(R1−R2)≤−3.59; and0.07≤d1/TTL≤0.15.
5. The camera optical lens as described in claim 1, wherein the second lens comprises an object side surface being convex in a paraxial region and an image side surface being concave in the paraxial region, and the camera optical lens further satisfies following conditions: 3.83≤f2/f≤1092.97;−179.19≤(R3+R4)/(R3−R4)≤55.93; and0.03≤d3/TTL≤0.09,Wheref2 denotes a focal length of the second lens;R3 denotes a curvature radius of the object side surface of the second lens;R4 denotes a curvature radius of the image side surface of the second lens;d3 denotes an on-axis thickness of the second lens; andTTL denotes a total optical length from an object side surface of the first lens to an image plane of the camera optical lens along an optic axis.
6. The camera optical lens as described in claim 5, further satisfying following conditions: 6.13≤f2/f≤874.37;−111.99≤(R3+R4)/(R3−R4)≤44.74; and0.04≤d3/TTL≤0.07.
7. The camera optical lens as described in claim 1, wherein the third lens comprises an object side surface being convex in a paraxial region and an image side surface being concave in the paraxial region, and the camera optical lens further satisfies following conditions: −8.26≤f3/f≤−1.73;0.84≤(R5+R6)/(R5−R6)≤3.37; and0.03≤d5/TTL≤0.09,WhereR5 denotes a curvature radius of the object side surface of the third lens;R6 denotes a curvature radius of the image side surface of the third lens;d5 denotes an on-axis thickness of the third lens; andTTL denotes a total optical length from an object side surface of the first lens to an image plane of the camera optical lens along an optic axis.
8. The camera optical lens as described in claim 7, further satisfying following conditions: −5.16≤f3/f≤−2.16;1.35≤(R5+R6)/(R5−R6)≤2.70; and0.04≤d5/TTL≤0.07.
9. The camera optical lens as described in claim 1, wherein the fourth lens comprises an object side surface being convex in a paraxial region and an image side surface being convex in the paraxial region, and the camera optical lens further satisfies following conditions: 1.11≤(f4/f≤4.90;−1.37≤(R7+R8)/(R7−R8)≤0.83; and0.05≤d7/TTL≤0.17,WhereR7 denotes a curvature radius of the object side surface of the fourth lens;R8 denotes a curvature radius of the image side surface of the fourth lens;d7 denotes an on-axis thickness of the fourth lens; andTTL denotes a total optical length from an object side surface of the first lens to an image plane of the camera optical lens along an optic axis.
10. The camera optical lens as described in claim 9, further satisfying following conditions: 1.77≤f4/f≤3.92;−0.86≤(R7+R8)/(R7−R8)≤0.66; and0.08≤d7/TTL≤0.14.
11. The camera optical lens as described in claim 1, wherein the fifth lens comprises an object side surface being convex in a paraxial region and an image side surface being concave in the paraxial region, and the camera optical lens further satisfies following conditions: −6.34≤f5/f≤−1.61;1.83≤(R9+R10)/(R9−R10)≤10.06; and0.03≤d9/TTL≤0.10,Wheref5 denotes a focal length of the fifth lens;R9 denotes a curvature radius of the object side surface of the fifth lens;R10 denotes a curvature radius of the image side surface of the fifth lens;d9 denotes an on-axis thickness of the fifth lens; andTTL denotes a total optical length from an object side surface of the first lens to an image plane of the camera optical lens along an optic axis.
12. The camera optical lens as described in claim 11, further satisfying following conditions: −3.96≤f5/f≤−2.01;2.93≤(R9+R10)/(R9−R10)≤8.05; and0.04≤d9/TTL≤0.08.
13. The camera optical lens as described in claim 1, wherein the sixth lens comprises an object side surface being convex in a paraxial region and an image side surface being concave in the paraxial region, and the camera optical lens further satisfies following conditions: 0.56≤f6/f≤1.73;−4.44≤(R11+R12)/(R11−R12)≤−0.95; and0.03≤d11/TTL≤0.12,Wheref6 denotes a focal length of the sixth lens;R11 denotes a curvature radius of the object side surface of the sixth lens;R12 denotes a curvature radius of the image side surface of the sixth lens;d11 denotes an on-axis thickness of the sixth lens; andTTL denotes a total optical length from an object side surface of the first lens to an image plane of the camera optical lens along an optic axis.
14. The camera optical lens as described in claim 13, further satisfying following conditions: 0.89≤f6/f≤1.39;−2.77≤(R11+R12)/(R11−R12)≤−1.18; and0.05≤d11/TTL≤0.09.
15. The camera optical lens as described in claim 1, wherein the seventh lens comprises an object side surface being convex in a paraxial region and an image side surface being concave in the paraxial region, and the camera optical lens further satisfies following conditions: −30.53≤f7/f≤−1.09; and0.07≤d13/TTL≤0.20,Wheref7 denotes a focal length of the seventh lens;d13 denotes an on-axis thickness of the seventh lens; andTTL denotes a total optical length from an object side surface of the first lens to an image plane of the camera optical lens along an optic axis.
16. The camera optical lens as described in claim 15, further satisfying following conditions: −19.08≤f7/f≤−1.36; and0.10≤d13/TTL≤0.16.
17. The camera optical lens as described in claim 1, wherein the total optical length TTL of the camera optical lens is smaller than or equal to 7.13 mm.
18. The camera optical lens as described in claim 17, wherein the total optical length TTL of the camera optical lens is smaller than or equal to 6.80 mm.
19. The camera optical lens as described in claim 1, wherein an F number of the camera optical lens is smaller than or equal to 1.60.
20. The camera optical lens as described in claim 19, wherein the F number of the camera optical lens is smaller than or equal to 1.57.

Priority Claims (1)

Number	Date	Country	Kind
201910581372.0	Jun 2019	CN	national

Foreign Referenced Citations (2)

Number	Date	Country
57038408	Mar 1982	JP
02027310	Jan 1990	JP

Non-Patent Literature Citations (2)

Entry
JP57038408, trnaslation (1982).
JP02027310, translation (1990).

Related Publications (1)

	Number	Date	Country
	20200409100 A1	Dec 2020	US

Camera optical lens including seven lenses of ++-+-+-refractive powers

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