Camera optical lens including six lenses of +−−++− Refractive Powers

Description

FIELD OF THE PRESENT INVENTION

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

DESCRIPTION OF RELATED ART

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 THE DRAWINGS

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

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 invention;

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 invention;

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;

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

DETAILED DESCRIPTION OF THE EXEMPLARY EMBODIMENTS

In order to make the objects, technical solutions, and advantages of the present invention more apparent, the embodiments of the present invention will be described in detail below. However, it will be apparent to the one skilled in the art that, in the various embodiments of the present invention, a number of technical details are presented in order to provide the reader with a better understanding of the invention. However, the technical solutions claimed in the present invention can be implemented without these technical details and various changes and modifications based on the following embodiments.

Embodiment 1

As referring to the accompanying drawings, the present invention provides a camera optical lens 10. FIG. 1 shows the camera optical lens 10 according to Embodiment 1 of the present invention, the camera optical lens 10 comprises six lenses. Specifically, from an object side to an image side, the camera optical lens 10 comprises in sequence: an aperture S1, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens L6. Optical elements like optical filter GF can be arranged between the sixth lens L6 and an image surface Si.

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

Here, a focal length of the first lens L1 is defined as f1, and a focal length of the third lens L3 is defined as f3. The camera optical lens 10 further satisfies a following condition: −5.00 custom character f1/f3−1.10, which specifies a ratio of the focal length f1 of the first lens L1 and the focal length f3 of the third lens L3. This can effectively reduce the sensitivity of the camera optical lens can be effectively reduced, and further improve an imaging quality. Preferably, the following condition shall be satisfied, −4.97 custom character f1/f3 −1.11.

A curvature radius of an object side surface of the third lens L3 is defined as R5, and a curvature radius of an image side surface of the third lens L3 is defined as R6. The camera optical lens 10 further satisfies the following condition: −10.00 custom character R5/R6−1.00, which defines a shape of the third lens L3. When the value is within the range, as the camera optical lens develops toward ultra-thin and wide-angle, it is beneficial to correct the problem of an axial chromatic aberration. Preferably, the following condition shall be satisfied, −9.95 custom character R5/R6−1.03.

A total optical length from an object side surface of the first lens L1 to the image surface of the camera optical lens 10 along an optical axis is defined as TTL.

When the focal length of the first lens, the focal length of the third lens, the curvature radius of the object side surface of the third lens, and curvature radius of the image side surface of the third lens satisfy the above conditions, the camera optical lens has an advantage of high performance and meets a design requirement on low TTL.

In the 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 focal length of the camera optical lens 10 is defined as f, and the focal length of the first lens L1 is defined as f1. The camera optical lens 10 further satisfies the following condition: 0.69 custom character f1/f4.23, which defines the ratio of the positive refractive power of the first lens L1 and the focal length f of the camera optical lens 10. When the value is within the range, the first lens has a suitable positive refractive power that is beneficial for reducing an aberration of the system, and is beneficial for developing ultra-thin and wide-angle lenses. Preferably, the following condition shall be satisfied, 1.11 custom character f1/f3.39.

A curvature radius of the object side surface of the first lens L1 is defined as R1, and a curvature radius of an image side surface of the first lens L1 is defined as R2. The camera optical lens 10 further satisfies the following condition: −13.34 custom character (R1+R2)/(R1−R2) −1.56. This condition reasonably controls a shape of the first lens, so that the first lens can effectively correct a spherical aberration of the system. Preferably, the following condition shall be satisfied, −8.34 (R1+R2)/(R1−R2) −1.95.

An on-axis thickness of the first lens L1 is defined as d1. The camera optical lens 10 further satisfies the following condition: 0.04 custom character d1/TTL0.21, which is beneficial for developing ultra-thin lenses. Preferably, the following condition shall be satisfied, 0.07 d1/TTL0.17.

In the embodiment, the second lens L2 has a negative refractive power.

A focal length of the second lens L2 is defined as f2. The camera optical lens 10 further satisfies the following condition: −10.72 custom character f2/f−2.25. It benefits for correcting the aberration of the optical system by controlling the negative refractive power of the second lens L2 being within a reasonable scope. Preferably, the following condition shall be satisfied, −6.70 f2/f−2.81.

A curvature radius of an object side surface of the second lens L2 is defined as R3, and a curvature radius of an image side surface of the second lens L2 is defined as R4. The camera optical lens 10 further satisfies the following condition: −3.34 custom character (R3+R4)/(R3−R4)9.87, which defines a shape of the second lens L2. When the value is within the range, as the camera optical lens develops toward ultra-thin and wide-angle, it is beneficial to correct the problem of the axial chromatic aberration. Preferably, the following condition shall be satisfied, −2.09 custom character (R3+R4)/(R3−R4)7.89.

An on-axis thickness of the second lens L2 is defined as d3. The camera optical lens 10 further satisfies the following condition: 0.02 custom character d3/TTL0.07, which benefits for developing ultra-thin lenses. Preferably, the following condition shall be satisfied, 0.03d3/TTL0.06.

In the embodiment, the object side surface of the third lens L3 is concave in the paraxial region, the 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 defined as f, and the focal length of the third lens L3 is defined as f3. The camera optical lens 10 further satisfies the following condition: −2.49 custom character f3/f−0.38. The appropriate distribution of the refractive power leads to a better imaging quality and a lower sensitivity. Preferably, the following condition shall be satisfied, −1.56f3/f−0.48.

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 the following condition: 0.01 custom character (R5+R6)/(R5−R6)1.22. This can effectively control the 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, the following condition shall be satisfied, 0.02 custom character (R5+R6)/(R5−R6)0.98.

An on-axis thickness of the third lens L3 is defined as d5. The camera optical lens 10 further satisfies the following condition: 0.02 custom character d5/TTL0.06, which benefits for developing ultra-thin lenses. Preferably, the following condition shall be satisfied, 0.03d5/TTL0.05.

In the 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 defined as f, and a focal length of the fourth lens L4 is f4. The camera optical lens 10 further satisfies the following condition: 0.16 custom character f4/f1.24. The appropriate distribution of the refractive power leads to a better imaging quality and a lower sensitivity. Preferably, the following condition shall be satisfied, 0.25f4/f0.99.

A curvature radius of an object side surface of the fourth lens L4 is defined as R7, and a curvature radius of an image side surface of the fourth lens L4 is defined as R8. The camera optical lens 10 further satisfies the following condition: 0.05 custom character (R7+R8)/(R7−R8)0.38, which defines a shape of the fourth lens L4. When the value is within the range, as the development of ultra-thin and wide-angle lens, it benefits for solving the problems, such as correcting an off-axis aberration. Preferably, the following condition shall be satisfied, 0.08 custom character (R7+R8)/(R7−R8)0.30.

An on-axis thickness of the fourth lens L4 is defined as d7. The camera optical lens 10 further satisfies the following condition: 0.05 custom character d7/TTL0.15, which benefits for developing ultra-thin lenses. Preferably, the following condition shall be satisfied, 0.07d7/TTL0.12.

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

The focal length of the camera optical lens 10 is defined as f, and a focal length of the fifth lens L5 is defined as f5. The camera optical lens 10 further satisfies the following condition: 0.33 custom character f5/f1.79, which can effectively make a light angle of the camera lens be gentle, and the sensitivity of the tolerance can be reduced. Preferably, the following condition shall be satisfied, 0.53f5/f1.43.

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 the following condition: 1.43 custom character (R9+R10)/(R9−R10)5.86, which defines a shape of the fifth lens L5. When the value is within the range, as the development of ultra-thin and wide-angle lens, it benefits for solving the problems, such as correcting the off-axis aberration. Preferably, the following condition shall be satisfied, 2.28 custom character (R9+R10)/(R9−R10)4.68.

An on-axis thickness of the fifth lens L5 is defined as d9. The camera optical lens 10 further satisfies, the following condition: 0.03 custom character d9/TTL0.13, which benefits for developing ultra-thin lenses. Preferably, the following condition shall be satisfied, 0.05d9/TTL0.11.

In the 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 negative refractive power.

The focal length of the camera optical lens 10 is defined as f, and a focal length of the sixth lens L6 is defined as f6. The camera optical lens 10 further satisfies the following condition: −1.93 custom character f6/f−0.32. The appropriate distribution of the refractive power leads to a better imaging quality and a lower sensitivity. Preferably, the following condition shall be satisfied, −1.21f6/f−0.40.

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 the following condition: 0.71 custom character (R11+R12)/(R11−R12)3.80, which defines a shape of the sixth lens L6. When the value is within the range, as the development of ultra-thin and wide-angle lens, it benefits for solving the problems, such as correcting the off-axis aberration. Preferably, the following condition shall be satisfied, 1.13 custom character (R11+R12)/(R11−R12)3.04.

An on-axis thickness of the sixth lens L6 is defined as d11. The camera optical lens 10 further satisfies the following condition: 0.02 custom character d11/TTL0.16, which benefits for developing ultra-thin lenses. Preferably, the following condition shall be satisfied, 0.03d11/TTL0.13.

In this embodiment, the focal length of the camera optical lens 10 is defined as f, and a combined focal length of the first lens L1 and the second lens L2 is defined as f12. The camera optical lens 10 further satisfies the following condition: 0.94 custom character f12/f14.92. With such configuration, the abberation and distortion of the camera optical lens can be eliminated while suppressing a back focal length of the camera optical lens, thereby maintaining miniaturization of the camera lens system. Preferably, the following condition shall be satisfied, 1.51 custom character f12/f11.93.

In this embodiment, the total optical length TTL of the camera optical lens 10 is less than or equal to 6.45 mm, it benefits for developing ultra-thin lenses. Preferably, the total optical length TTL of the camera optical lens 10 is less than or equal to 6.15 mm.

In this embodiment, an F number of the camera optical lens 10 is less than or equal to 2.39. 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 less than or equal to 2.35.

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

In the following, examples will be used to describe the camera optical lens 10 of the present invention. 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: the total optical length from the object side surface of the first lens to the image surface of the camera optical lens 10 along the optical axis, the unit of TTL is mm.

Preferably, inflexion points and/or arrest points can also be arranged on the object side surface and/or image side surface of the lens, so that the demand for high quality imaging can be satisfied, the description below can be referred for specific implementable scheme.

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

TABLE 1

R
d
nd
ν d

S1
∞
d0 =
−0.230

R1
1.828
d1 =
0.427
nd1
1.5445
ν 1
55.99

R2
4.552
d2 =
0.506

R3
−8.332
d3 =
0.238
nd2
1.6713
ν 2
19.24

R4
−33.263
d4 =
0.044

R5
−5.383
d5 =
0.220
nd3
1.5445
ν 3
55.99

R6
5.127
d6 =
0.032

R7
4.517
d7 =
0.523
nd4
1.5445
ν 4
55.99

R8
−2.690
d8 =
0.614

R9
−1.988
d9 =
0.357
nd5
1.5445
ν 5
55.99

R10
−1.177
d10 =
0.230

R11
2.224
d11 =
0.553
nd6
1.5445
ν 6
55.99

R12
0.966
d12 =
1.188

R13
∞
d13 =
0.210
ndg
1.5168
ν g
64.17

R14
∞
d14 =
0.100

where, 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 an object side surface of the optical filter GF;

R14: 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 optical filter GF;

d13: on-axis thickness of the optical filter GF;

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

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;

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;

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 invention.

TABLE 2

Conic coefficient
Aspherical surface coefficients

k
A4
A6
A8
A10

R1
6.4505E−01
−6.4391E−03
5.5448E−02
−5.4354E−02
−2.6805E−01

R2
2.0483E+01
−1.2276E−02
−1.1208E−01
3.2631E−01
−5.5188E−01

R3
3.1959E+01
−1.7290E−01
−4.8103E−02
−2.0466E−02
1.0006E−01

R4
−5.0027E+01
−7.4034E−02
−2.6035E−02
1.8765E−02
−6.3649E−06

R5
0.0000E+00
6.6351E−02
−5.4825E−04
−1.8638E−02
−1.1156E−02

R6
0.0000E+00
−6.4175E−02
−6.9715E−04
−1.7402E−03
−3.9716E−03

R7
0.0000E+00
−3.3935E−02
1.9317E−03
−3.7834E−04
−2.3118E−03

R8
0.0000E+00
1.0449E−03
1.2977E−02
4.5045E−03
−8.3942E−05

R9
−3.4902E+00
3.2011E−03
2.8099E−03
−2.7444E−03
−2.6206E−04

R10
−3.4450E+00
−6.9813E−03
1.8413E−02
−4.1462E−03
5.7755E−04

R11
−5.8923E+00
−3.8480E−02
4.2878E−03
9.6924E−06
−8.0712E−06

R12
−3.8286E+00
−2.6406E−02
4.3066E−03
−5.1048E−04
3.3588E−05

Aspherical surface coefficients

A12
A14
A16
A18
A20

R1
8.8758E−01
−9.6280E−01
3.5998E−01
0.0000E+00
0.0000E+00

R2
2.7504E−01
1.6994E−01
−2.0948E−01
0.0000E+00
0.0000E+00

R3
−5.8285E−02
−8.1012E−02
5.5066E−02
0.0000E+00
0.0000E+00

R4
6.7846E−04
−2.6048E−02
1.5906E−02
0.0000E+00
0.0000E+00

R5
5.1897E−04
1.5107E−03
−4.2896E−03
0.0000E+00
0.0000E+00

R6
−2.8145E−03
−1.4272E−03
−8.0071E−04
0.0000E+00
0.0000E+00

R7
−1.4610E−03
−5.3589E−04
7.2827E−05
0.0000E+00
0.0000E+00

R8
−4.0162E−04
−9.7552E−05
−3.0857E−05
0.0000E+00
0.0000E+00

R9
7.1336E−04
−3.7154E−05
−2.9284E−05
0.0000E+00
0.0000E+00

R10
1.6655E−05
−3.8025E−05
4.0665E−06
0.0000E+00
0.0000E+00

R11
−4.2369E−08
−2.3026E−07
1.2988E−08
0.0000E+00
0.0000E+00

R12
−1.7378E−06
1.3945E−07
−6.8076E−09
0.0000E+00
0.0000E+00

Where, K is a conic coefficient, A4, A6, A8, A10, A12, A14, A16, A18, A20 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+A18x¹⁸+A20x²⁰ (1)

For convenience, an aspheric surface of each lens surface uses the aspheric surfaces shown in the above condition (1). However, the present invention is not limited to the aspherical polynomials form shown in the condition (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 invention. 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, and P6R1 and P6R2 represent the object side surface and the image side surface of the sixth lens L6. The data in the column named “inflexion point position” refers to vertical distances from inflexion points arranged on each lens surface to the optical 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 optical axis of the camera optical lens 10.

TABLE 3

Number of
Inflexion point
Inflexion point
Inflexion point

inflexion points
position 1
position 2
position 3

P1R1
0

P1R2
1
0.785

P2R1
0

P2R2
0

P3R1
2
0.525
0.725

P3R2
1
0.505

P4R1
1
0.735

P4R2
1
0.945

P5R1
1
1.265

P5R2
1
0.925

P6R1
3
0.775
2.035
2.425

P6R2
1
0.865

TABLE 4

Number of arrest points
Arrest point position 1

P1R1
0

P1R2
0

P2R1
0

P2R2
0

P3R1
0

P3R2
1
0.825

P4R1
1
1.065

P4R2
0

P5R1
0

P5R2
0

P6R1
1
1.655

P6R2
1
2.375

FIG. 2 and FIG. 3 respectively illustrate a longitudinal aberration and a lateral color of light with wavelengths of 470 nm, 555 nm and 650 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 10 is 1.870 mm. The image height of 1.0H is 3.284 mm. The FOV (field of view) is 80.87°. 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, the meaning of its symbols is the same as that of Embodiment 1, in the following, only the differences are listed.

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

TABLE 5

R
d
nd
ν d

S1
∞
d0 =
−0.200

R1
2.231
d1 =
0.837
nd1
1.5445
ν 1
55.99

R2
3.117
d2 =
0.298

R3
5.152
d3 =
0.273
nd2
1.6713
ν 2
19.24

R4
3.792
d4 =
0.085

R5
−11.002
d5 =
0.219
nd3
1.5445
ν 3
55.99

R6
2.004
d6 =
0.030

R7
2.236
d7 =
0.537
nd4
1.5445
ν 4
55.99

R8
−1.780
d8 =
0.030

R9
−1.977
d9 =
0.524
nd5
1.5445
ν 5
55.99

R10
−0.951
d10 =
0.324

R11
5.752
d11 =
0.224
nd6
1.5445
ν 6
55.99

R12
0.992
d12 =
2.171

R13
∞
d13 =
0.210
ndg
1.5168
ν g
64.17

R14
∞
d14 =
0.100

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

TABLE 6

Conic coefficient
Aspherical surface coefficients

k
A4
A6
A8
A10

R1
1.0421E+00
1.5281E−02
−1.9514E−01
5.1753E−01
−2.1680E−01

R2
7.4295E+00
−9.5631E−02
−1.1643E−01
5.2289E−01
−9.8764E−01

R3
−8.4295E+00
−3.1577E−01
3.1102E−02
−2.6069E−01
4.7973E−02

R4
8.1600E+00
−1.7770E−01
−1.1979E−01
5.1137E−02
2.3437E−02

R5
9.1234E+01
−4.4451E−02
2.2965E−02
−1.9352E−02
−1.0584E−02

R6
−1.9714E+01
−1.1786E−01
−2.5150E−02
8.1218E−03
−1.2806E−03

R7
−1.3607E+01
−1.9705E−02
1.4383E−02
−3.7055E−03
−4.3879E−04

R8
−3.0423E+01
−2.8054E−03
1.5555E−02
2.7576E−03
−5.2155E−04

R9
−3.4231E+01
1.2283E−02
−7.9473E−03
9.2382E−04
2.1311E−03

R10
−3.5249E+00
−4.8328E−02
5.2115E−02
3.2433E−04
7.4485E−04

R11
−1.1846E+01
−6.5950E−02
2.0174E−03
1.4831E−03
4.0815E−04

R12
−5.2845E+00
−5.8993E−02
1.1543E−02
−6.1406E−04
−1.1730E−04

Aspherical surface coefficients

A12
A14
A16
A18
A20

R1
−1.5940E+00
3.1126E+00
−1.8592E+00
−1.4591E−01
3.5373E−01

R2
−8.1103E−01
4.4699E+00
−4.3878E+00
3.1010E−01
8.8318E−01

R3
2.1252E−01
7.6352E−02
−3.3502E−01
0.0000E+00
0.0000E+00

R4
−1.0173E−02
−2.0065E−02
1.5009E−02
0.0000E+00
0.0000E+00

R5
5.6236E−04
1.3021E−02
−3.9128E−04
0.0000E+00
0.0000E+00

R6
−2.6318E−03
−2.4292E−03
1.8570E−03
0.0000E+00
0.0000E+00

R7
6.8392E−06
3.5485E−04
−8.1191E−04
0.0000E+00
0.0000E+00

R8
−7.3854E−04
−4.8272E−04
1.4730E−05
0.0000E+00
0.0000E+00

R9
2.1104E−03
−7.1095E−05
−3.3257E−04
−4.5517E−05
−6.9110E−06

R10
−4.5710E−04
−2.5086E−04
−1.1519E−04
−2.6108E−05
1.7944E−05

R11
9.2747E−06
−1.7832E−05
−3.3430E−06
5.2873E−07
−9.6643E−08

R12
−8.5826E−06
2.9874E−06
1.4889E−06
−6.7450E−08
−3.2779E−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 invention.

TABLE 7

Number of
Inflexion point
Inflexion point
Inflexion point

inflexion points
position 1
position 2
position 3

P1R1
0

P1R2
1
0.575

P2R1
1
0.225

P2R2
1
0.345

P3R1
1
1.035

P3R2
1
0.395

P4R1
1
0.935

P4R2
2
0.615
1.185

P5R1
2
0.715
1.335

P5R2
2
0.785
1.395

P6R1
3
0.455
1.525
1.735

P6R2
2
0.635
1.885

TABLE 8

Number of
Arrest point
Arrest point

arrest points
position 1
position 2

P1R1
0

P1R2
1
0.815

P2R1
1
0.385

P2R2
1
0.575

P3R1
0

P3R2
1
0.715

P4R1
1
1.225

P4R2
0

P5R1
1
1.195

P5R2
2
1.325
1.445

P6R1
1
0.795

P6R2
1
1.685

FIG. 6 and FIG. 7 respectively illustrate a longitudinal aberration and a lateral color of light with wavelengths of 470 nm, 555 nm and 650 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 10 according to Embodiment 2, in which a field curvature S is a field curvature in a sagittal direction and T is a field curvature in a tangential direction.

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

In this embodiment, the entrance pupil diameter of the camera optical lens is 1.897 mm. The image height of 1.0H is 3.284 mm. The FOV is 74.25°. 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.

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

TABLE 9

R
d
nd
νd

S1
∞
d0 =
−0.150

R1
2.218
d1 =
0.593
nd1
1.5445
ν1
55.99

R2
3.000
d2 =
0.340

R3
11.496
d3 =
0.239
nd2
1.6713
ν2
19.24

R4
5.287
d4 =
0.074

R5
−14.894
d5 =
0.248
nd3
1.5445
ν3
55.99

R6
1.504
d6 =
0.031

R7
1.520
d7 =
0.574
nd4
1.5445
ν4
55.99

R8
−1.253
d8 =
0.030

R9
−1.815
d9 =
0.355
nd5
1.5445
ν5
55.99

R10
−1.065
d10 =
0.122

R11
2.417
d11 =
0.227
nd6
1.5445
ν6
55.99

R12
0.748
d12 =
2.660

R13
∞
d13 =
0.210
ndg
1.5168
νg
64.17

R14
∞
d14 =
0.100

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

TABLE 10

Conic coefficient
Aspherical surface coefficients

k
A4
A6
A8
A10

R1
2.9759E−02
−8.6321E−05
−1.3436E−01
4.0466E−01
−1.4504E−01

R2
8.7335E+00
−8.1525E−02
−1.5352E−01
6.4310E−01
−1.0139E+00

R3
−2.8229E−01
−2.8409E−01
1.3299E−01
−1.6926E−01
3.2356E−02

R4
1.8213E+01
−1.8367E−01
−2.1466E−02
4.2000E−02
3.8055E−03

R5
8.2344E+01
1.4466E−03
−4.7853E−03
−1.7199E−03
4.5251E−03

R6
−2.0231E+01
−1.5215E−01
1.4375E−02
3.8297E−03
−1.0811E−02

R7
−1.6698E+01
−2.5374E−02
1.3762E−02
6.0978E−04
−2.6129E−03

R8
−1.3225E+01
−2.4537E−03
2.7962E−02
2.1863E−03
−7.5218E−04

R9
−2.8261E+01
8.4994E−03
−1.3257E−02
4.4148E−03
3.5012E−03

R10
−6.5190E+00
−1.1243E−02
4.5553E−02
−6.1577E−03
−1.2918E−03

R11
−6.4055E+00
−4.2215E−02
6.9398E−03
4.8943E−04
1.4792E−04

R12
−4.3413E+00
−3.2560E−02
7.0694E−03
−8.1639E−04
8.3619E−06

Aspherical surface coefficients

A12
A14
A16
A18
A20

R1
−1.4963E+00
2.8737E+00
−1.7647E+00
−4.6717E−02
2.8861E−01

R2
−1.0921E+00
4.2255E+00
−3.4351E+00
1.8363E−01
4.6370E−01

R3
1.2155E−01
9.1672E−02
−2.1186E−01
0.0000E+00
0.0000E+00

R4
1.0903E−04
−2.5053E−03
−9.4042E−03
0.0000E+00
0.0000E+00

R5
−1.5659E−03
8.6637E−05
9.3228E−04
0.0000E+00
0.0000E+00

R6
−4.6929E−03
−6.6058E−04
4.9564E−03
0.0000E+00
0.0000E+00

R7
−9.4133E−04
7.0033E−04
−3.6950E−04
−3.4217E−05
−1.7276E−06

R8
7.0104E−05
−1.0739E−04
−2.7566E−04
3.0821E−06
−9.8778E−07

R9
1.8047E−03
−4.4056E−04
−4.0380E−04
2.1256E−06
5.4981E−06

R10
−4.9127E−04
3.8261E−05
2.7456E−05
−1.4155E−07
−1.8509E−07

R11
−1.4992E−05
−1.4970E−05
1.1229E−06
1.3202E−07
−2.2483E−10

R12
2.4062E−05
3.4050E−06
−9.7568E−07
−3.5476E−08
1.1424E−09

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

TABLE 11

Number of
Inflexion point
Inflexion point
Inflexion point

inflexion points
position 1
position 2
position 3

P1R1
0

P1R2
1
0.575

P2R1
1
0.225

P2R2
1
0.345

P3R1
1
1.035

P3R2
1
0.395

P4R1
1
0.935

P4R2
2
0.615
1.185

P5R1
2
0.715
1.335

P5R2
2
0.785
1.395

P6R1
3
0.455
1.525
1.735

P6R2
2
0.635
1.885

TABLE 12

Number of
Arrest point
Arrest point

arrest points
position 1
position 2

P1R1
0

P1R2
1
0.815

P2R1
1
0.385

P2R2
1
0.575

P3R1
0

P3R2
1
0.715

P4R1
1
1.225

P4R2
0

P5R1
1
1.195

P5R2
2
1.325
1.445

P6R1
1
0.795

P6R2
1
1.685

FIG. 10 and FIG. 11 respectively illustrate a longitudinal aberration and a lateral color of light with wavelengths of 470 nm, 555 nm and 650 nm after passing the camera optical lens 30 according to Embodiment 3. FIG. 12 illustrates a field curvature and a distortion of light with a wavelength of 555 nm after passing the camera optical lens 30 according to Embodiment 3, 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 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 1.871 mm. The image height of 1.0H is 3.284 mm. The FOV is 73.64°. 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
3.834
4.305
4.351

f1
5.296
10.765
12.279

f2
−16.468
−23.076
−14.675

f3
−4.772
−3.085
−2.488

f4
3.168
1.904
1.357

f5
4.572
2.842
4.044

f6
−3.700
−2.231
−2.084

f12
7.228
16.891
43.266

FNO
2.05
2.27
2.33

f1/f3
−1.11
−3.49
−4.94

R5/R6
−1.05
−5.49
−9.90

It is to be understood, however, that even though numerous characteristics and advantages of the present exemplary embodiments have been set forth in the foregoing description, together with details of the structures and functions of the embodiments, the disclosure is illustrative only, and changes may be made in detail, especially in matters of shape, size, and arrangement of parts within the principles of the invention to the full extent indicated by the broad general meaning of the terms where the appended claims are expressed.

Claims

1. A camera optical lens, comprising, from an object side to an image side in sequence: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens; the first lens has a positive refractive power with a convex object side surface in a paraxial region and a concave image side surface in the paraxial region;the second lens has a negative refractive power, and the third lens has a negative refractive power; wherein the camera optical lens further satisfies the following conditions; −5.00f1/f3−1.10;−10.00R5/R6−1.00;0.69f1/f4.23;−13.34(R1+R2)/(R1−R2) −1.56; and0.04d1/TTL0.21;where,f1: a focal length of the first lens;f3: a focal length of the third lens;R5: a curvature radius of an object side surface of the third lens; andR6: a curvature radius of an image side surface of the third lens;f: a focal length of the camera optical lens;R1: a curvature radius of the object side surface of the first lens;R2: a curvature radius of the image side surface of the first lens;d1: an on-axis thickness of the first lens; andTTL: a total optical length from the object side surface of the first lens of the camera optical lens to an image surface of the camera optical lens along an optical axis.
2. The camera optical lens according to claim 1 further satisfying the following conditions: −4.97f1/f3−1.11; and−9.95R5/R6−1.03.
3. The camera optical lens according to claim 1 further satisfying the following conditions: 1.11f1/f3.39;−8.34(R1+R2)/(R1−R2)−1.95; and0.07d1/TTL0.17.
4. The camera optical lens according to claim 1 further satisfies the following conditions: −10.72f2/f−2.25;−3.34(R3+R4)/(R3−R4)9.87; and0.02d3/TTL0.07;where,R3: a curvature radius of an object side surface of the second lens;R4: a curvature radius of an image side surface of the second lens;f2: a focal length of the second lens;d3: an on-axis thickness of the second lens; andTTL: a total optical length from an object side surface of the first lens of the camera optical lens to an image surface of the camera optical lens along an optical axis.
5. The camera optical lens according to claim 4 further satisfying the following conditions: −6.70f2/f−2.81;−2.09(R3+R4)/(R3−R4)7.89; and0.03d3/TTL0.06.
6. The camera optical lens according to claim 1, wherein the object side surface of the third lens being concave in a paraxial region and the image side surface of the third lens being concave in the paraxial region; and the camera optical lens further satisfies the following conditions: −2.49f3/f−0.38;0.01(R5+R6)/(R5−R6)1.22; and0.02d5/TTL0.06;where,f: a focal length of the camera optical lens;d5: an on-axis thickness of the third lens; andTTL: a total optical length from an object side surface of the first lens of the camera optical lens to an image surface of the camera optical lens along an optical axis.
7. The camera optical lens according to claim 6 further satisfying the following conditions: −1.56f3/f−0.48;0.02(R5+R6)/(R5−R6)0.98; and0.03d5/TTL0.05.
8. The camera optical lens according to claim 1, wherein the fourth lens has a positive refractive power with a convex object side surface in a paraxial region and a convex image side surface in the paraxial region; and the camera optical lens further satisfies the following conditions: 0.16f4/f1.24;0.05(R7+R8)/(R7−R8)0.38; and0.05d7/TTL0.15;where,f: a focal length of the camera optical lens;R7: a curvature radius of the object side surface of the fourth lens;R8: a curvature radius of the image side surface of the fourth lens;f4: a focal length of the fourth lens;d7: an on-axis thickness of the fourth lens; andTTL: a total optical length from an object side surface of the first lens to an image surface of the camera optical lens along an optical axis.
9. The camera optical lens according to claim 8 further satisfying the following conditions: 0.25f4/f0.99;0.08(R7+R8)/(R7−R8)0.30; and0.07d7/TTL0.12.
10. The camera optical lens according to claim 1, wherein the fifth lens has a positive refractive power with a concave object side surface in a paraxial region and a convex image side surface in the paraxial region; and the camera optical lens further satisfies the following conditions: 0.33f5/f1.79;1.43(R9+R10)/(R9−R10)5.86; and0.03d9/TTL0.13;where,f: a focal length of the camera optical lens;f5: a focal length of the fifth lens;R9: a curvature radius of the object side surface of the fifth lens;R10: a curvature radius of the image side surface of the fifth lens;d9: an on-axis thickness of the fifth lens; andTTL: a total optical length from an object side surface of the first lens of the camera optical lens to an image surface of the camera optical lens along an optical axis.
11. The camera optical lens according to claim 10 further satisfying the following conditions: 0.53f5/f1.43;2.28(R9+R10)/(R9−R10)4.68; and0.05d9/TTL0.11.
12. The camera optical lens according to claim 1, wherein the sixth lens has a negative refractive power with a convex object side surface in a paraxial region and a concave image side surface in the paraxial region; and the camera optical lens further satisfies the following conditions: −1.93f6/f−0.32;0.71(R11+R12)/(R11−R12)3.80; and0.02d11/TTL0.16;where,f: a focal length of the camera optical lens;f6: a focal length of the sixth lens;R11: a curvature radius of the object side surface of the sixth lens;R12: a curvature radius of the image side surface of the sixth lens;d11: an on-axis thickness of the sixth lens; andTTL: a total optical length from an object side surface of the first lens of the camera optical lens to an image surface of the camera optical lens along an optical axis.
13. The camera optical lens according to claim 12 further satisfying the following conditions: −1.21f6/f−0.40;1.13(R11+R12)/(R11−R12)3.04; and0.03d11/TTL0.13.
14. The camera optical lens according to claim 1, wherein a focal length of the camera optical lens is f, a combined focal length of the first lens and the second lens is f12; and the camera optical lens further satisfies the following conditions: 0.94f12/f14.92.
15. The camera optical lens according to claim 14 further satisfying the following conditions: 1.51f12/f11.93.
16. The camera optical lens as described in claim 1, wherein a total optical length TTL from an object side surface of the first lens of the camera optical lens to an image surface of the camera optical lens along an optical axis is less than or equal to 6.45 millimeters.
17. The camera optical lens as described in claim 16, wherein the total optical length TTL from the object side surface of the first lens of the camera optical lens to the image surface of the camera optical lens along the optical axis is less than or equal to 6.15 millimeters.
18. The camera optical lens as described in claim 1, wherein an F number of the camera optical lens is less than or equal to 2.39.
19. The camera optical lens as described in claim 18, wherein the F number of the camera optical lens is less than or equal to 2.35.

Priority Claims (1)

Number	Date	Country	Kind
201910581278.5	Jun 2019	CN	national

US Referenced Citations (1)

Number	Name	Date	Kind
20160131870	Tang	May 2016	A1

Related Publications (1)

	Number	Date	Country
	20200409105 A1	Dec 2020	US

Camera optical lens including six lenses of +−−++− Refractive Powers

Information

Patent Number

Date Filed

Date Issued

Inventors

Original Assignees

Examiners

Agents

CPC

Field of Search

CPC

International Classifications

Term Extension

Abstract

Description

Claims

Priority Claims (1)

US Referenced Citations (1)

Related Publications (1)