Camera optical lens

Abstract

The present disclosure relates to optical lens, and provides a camera optical lens including from an object side to an image side in sequence: a first lens having a positive refractive power, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens; wherein the camera optical lens satisfies the following conditions: 0.95≤f/TTL; −5.00≤f2/f≤−2.50; and 2.50≤(R11+R12)/(R11−R12)≤15.00. The camera optical lens can achieve good optical performance while meeting design requirements for a large aperture, a long focal length and ultra-thinness.

Description

TECHNICAL FIELD

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

BACKGROUND

With an emergence of smart phones in recent years, a demand for miniature camera lens is increasing day by day. However, in general, photosensitive devices of camera lens are nothing more than Charge Coupled Device (CCD) or Complementary Metal-Oxide Semiconductor Sensor (CMOS sensor). As a progress of semiconductor manufacturing technology makes a pixel size of the photosensitive devices become smaller, in addition to a 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, four-piece, or even five-piece or six-piece lens structure. However, with a development of technology and an increase of diverse demands of users, as a pixel area of the photosensitive devices is becoming smaller and smaller and a requirement of the system on the imaging quality is improving constantly, an eight-piece lens structure gradually appears in lens designs. Although a typical eight-piece lens already has a good optical performance, its refractive power, lens spacing and lens shape remain unreasonable to some extent, resulting in that the lens structure, which, even though, has excellent optical performance, is not able to meet the design requirement for a large aperture, a long focal length and ultra-thinness.

SUMMARY

Some embodiments of the present disclosure provide a camera optical lens. The camera optical lens includes from an object side to an image side in sequence: a first lens having a positive refractive power, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens. The camera optical lens satisfies the following conditions: 0.95≤f/TTL; −5.00≤f2/f≤−2.50; and 2.5≤(R11+R12)/(R11−R12)≤15.00, where TTL denotes 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; f denotes a focal length of the camera optical lens; f2 denotes a focal length of the second lens; R11 denotes a central curvature radius of an object-side surface of the sixth lens; R12 denotes a central curvature radius of an image-side surface of the sixth lens.

As an improvement, the camera optical lens satisfies the following condition: 3.00≤d5/d6≤12.00, where d5 denotes an on-axis thickness of the third lens; d6 denotes an on-axis distance from an image-side surface of the third lens to an object-side surface of the fourth lens.

As an improvement, the camera optical lens satisfies the following conditions: 0.34≤f1/f≤1.26; −3.56≤(R1+R2)/(R1−R2)≤−1.00; and 0.06≤d1/TTL≤0.19, where f1 denotes a focal length of the first lens; R1 denotes a central curvature radius of an object-side surface of the first lens; R2 denotes a central curvature radius of an image-side surface of the first lens; and d1 denotes an on-axis thickness of the first lens.

As an improvement, the camera optical lens satisfies the following conditions: −0.12≤(R3+R4)/(R3−R4)≤0.61; and 0.01≤d3/TTL≤0.05, where R3 denotes a central curvature radius of an object-side surface of the second lens; R4 denotes a central curvature radius of an image-side surface of the second lens; and d3 denotes an on-axis thickness of the second lens.

As an improvement, the camera optical lens satisfies the following conditions: 0.56≤f3/f≤2.09; −3.49≤(R5+R6)/(R5−R6)≤−0.47; and 0.04≤d5/TTL≤0.13, where f3 denotes a focal length of the third lens; R5 denotes a central curvature radius of an object-side surface of the third lens; R6 denotes a central curvature radius of an image-side surface of the third lens; and d5 denotes an on-axis thickness of the third lens.

As an improvement, the camera optical lens satisfies the following conditions: −1.82≤f4/f≤−0.49; 0.37≤(R7+R8)/(R7−R8)≤1.50; and 0.02≤d7/TTL≤0.06; where f4 denotes a focal length of the fourth lens; R7 denotes a central curvature radius of an object-side surface of the fourth lens; R8 denotes a central curvature radius of an image-side surface of the fourth lens; and d7 denotes an on-axis thickness of the fourth lens.

As an improvement, the camera optical lens satisfies the following conditions: 1.05≤f5/f≤5.61; −2.19≤(R9+R10)/(R9−R10)≤−0.07; and 0.03≤d9/TTL≤0.09; where f5 denotes a focal length of the fifth lens; R9 denotes a central curvature radius of an object-side surface of the fifth lens; R10 denotes a central curvature radius of an image-side surface of the fifth lens; and d9 denotes an on-axis thickness of the fifth lens.

As an improvement, the camera optical lens satisfies the following conditions: 1.16≤f6/f≤14.68; and 0.02≤d11/TTL≤0.09; where f6 denotes a focal length of the sixth lens; and d11 denotes an on-axis thickness of the sixth lens.

As an improvement, the camera optical lens satisfies the following conditions: −102.11≤f7/f≤3.64; −75.04≤(R13+R14)/(R13−R14)≤5.73; and 0.03≤d13/TTL≤0.08; where f7 denotes a focal length of the seventh lens; R13 denotes a central curvature radius of an object-side surface of the seventh lens; R14 denotes a central curvature radius of an image-side surface of the seventh lens; and d13 denotes an on-axis thickness of the seventh lens.

As an improvement, the camera optical lens satisfies the following conditions: −3.14≤f8/f≤−0.46; 0.23≤(R15+R16)/(R15−R16)≤1.17 and 0.03≤d15/TTL≤0.10; where f8 denotes a focal length of the eighth lens; R15 denotes a central curvature radius of an object-side surface of the eighth lens; R16 denotes a central curvature radius of an image-side surface of the eighth lens; and d15 denotes an on-axis thickness of the eighth lens.

BRIEF DESCRIPTION OF DRAWINGS

To illustrate technical solutions according to embodiments of the present disclosure more clearly, accompanying drawings for describing the embodiments are introduced briefly in the following. Apparently, accompanying drawings in the following description are only some embodiments of the present disclosure, and persons of ordinary skill in the art can derive other drawings from the accompanying drawings without creative efforts.

FIG. 1 is a schematic diagram of a structure of a camera optical lens according to 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 according to 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 according to 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.

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 EMBODIMENTS

To make objectives, technical solutions, and advantages of the present disclosure clearer, embodiments of the present disclosure are described in detail with reference to accompanying drawings in the following. A person of ordinary skill in the art can understand that, in the embodiments of the present disclosure, many technical details are provided to make readers better understand the present disclosure. However, even without these technical details and any changes and modifications based on the following embodiments, technical solutions required to be protected by the present disclosure can be implemented.

Embodiment 1

Referring to the accompanying drawing, the present disclosure provides a camera optical lens 10. FIG. 1 shows a schematic diagram of a structure of a camera optical lens 10 of Embodiment 1 of the present disclosure, and the camera optical lens 10 includes eight lenses. Specifically, the camera optical lens 10 includes, from an object side to an image side 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, a sixth lens L6, a seventh lens L7 and an eighth lens L8. An optical element such as an optical filter GF can be arranged between the eighth lens L8 and an image surface Si.

In this embodiment, the first lens L1 has a positive refractive power, the second lens L2 has a negative refractive power, the third lens L3 has a positive refractive power, the fourth lens L4 has a negative refractive power, the fifth lens L5 has a positive refractive power, the sixth lens L6 has a positive refractive power, the seventh lens L7 has a positive refractive power and the eighth lens L8 has a negative refractive power. It should be appreciated that, in other embodiments, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the eighth lens L8 may have other refractive powers than that of this embodiment. In this embodiment, the first lens L1 has a positive refractive power, which facilitates improving performance of the camera optical lens 10.

In this embodiment, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the eighth lens L8 are made of plastic material. In other embodiments, the lenses may be made of other materials.

In this embodiment, a total optical length from the object side surface of the first lens L1 to an image surface S1 of the camera optical lens 10 along an optical axis is defined as TTL, a focal length of the camera optical lens 10 is defined as f, a focal length of the second lens L2 is defined as f2, a central curvature radius of an object-side surface of the sixth lens L6 is defined as R11, and a central curvature radius of an image-side surface of the sixth lens L6 is defined as R12. The camera optical lens 10 satisfies the following condition: 0.95≤f/TTL (1); −5.00≤f2/f≤−2.50 (2); and 2.50≤(R11+R12)/(R11−R12)≤15.00 (3).

The condition (1) specifies a ratio of the focal length of the camera optical lens 10 to the total optical length of the camera optical lens 10. When the condition (1) is satisfied, given the same total optical length TTL, the camera optical lens 10 has a longer focal length.

The condition (2) specifies a ratio of the focal length of the second lens L2 to the focal length of the camera optical lens 10, which can effectively balance a spherical aberration and a field curvature of the camera optical lens 10.

The condition (3) specifies a shape of the sixth lens L6. Within this condition (3), a deflection degree of the light passing through the lens can be alleviated, and an aberration can be effectively reduced.

An on-axis thickness of the third lens L3 is defined as d5, and an on-axis distance from an image-side surface of the third lens L3 to an object-side surface of the fourth lens L4 is defined as d6. The camera optical lens 10 satisfies the following condition: 3.00≤d5/d6≤12.00, which specifies a ratio of the on-axis thickness d5 of the third lens L3 to the on-axis distance d6 from an image-side surface of the third lens L3 to an object-side surface of the fourth L4. Within this condition, the total optical length of the camera optical lens 10 can be compressed, and ultra-thinness can be realized.

In this embodiment, the first lens L1 includes an object-side surface being convex in a paraxial region and an image-side surface being concave in the paraxial region.

The focal length of the camera optical lens 10 is defined as f, and a focal length of the first lens is defined as f1. The camera optical lens 10 satisfies the following condition: 0.34≤f1/f≤1.26, which specifies a ratio of the focal length of the first lens L1 to the focal length of the camera optical lens 10. Within this condition, the first lens L1 has an appropriate positive refractive power, the correction of the aberration of the camera optical lens 10 is facilitated, and the development of the lenses towards ultra-thinness is facilitated. Preferably, the camera optical lens 10 satisfies the following condition: 0.55≤f1/f≤1.01.

A central curvature radius of an object-side surface of the first lens L1 is defined as R1, and a central curvature radius of an image-side surface of the first lens L1 is defined as R2. The camera optical lens 10 satisfies the following condition: −3.56≤(R1+R2)/(R1−R2)≤−1.00. 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, the camera optical lens 10 satisfies the following condition: −2.22≤(R1+R2)/(R1−R2)≤−1.25.

An on-axis thickness of the first lens L1 is defined as d1, and the total optical length of the camera optical lens 10 is defined as TTL. The camera optical lens 10 satisfies the following condition: 0.06≤d1/TTL≤0.19. Within this condition, ultra-thinness can be realized. Preferably, the camera optical lens 10 satisfies the following condition: 0.09≤d1/TTL≤0.15.

In this embodiment, the second lens L2 includes an object-side surface being concave in a paraxial region and an image-side surface being concave in the paraxial region.

A central curvature radius of the object-side surface of the second lens L2 is defined as R3, and a central curvature radius of the image-side surface of the second lens L2 is defined as R4. The camera optical lens 10 satisfies the following condition: −0.12≤(R3+R4)/(R3−R4)≤0.61, which specifies a shape of the second lens L2. Within this condition, the development of the lenses towards ultra-thinness would facilitate correcting the on-axis chromatic aberration. Preferably, the camera optical lens 10 satisfies the following condition: −0.07≤(R3+R4)/(R3−R4)≤0.49.

An on-axis thickness of the second lens L2 is defines as d3, and the total optical length of the camera optical lens 10 is defined as TTL. The camera optical lens 10 satisfies the following condition: 0.01≤d3/TTL≤0.05. Within this condition, ultra-thinness of the lenses can be realized. Preferably, the camera optical lens 10 satisfies the following condition: 0.02≤d3/TTL≤0.04.

In this embodiment, the third lens L3 includes an object-side surface being convex in a paraxial region and an image-side surface being convex in the paraxial region.

The focal length of the camera optical lens 10 is defined as f, and a focal length of the third lens L3 is defined as f3. The camera optical lens 10 satisfies the following condition: 0.56≤f3/f≤2.09. With a reasonable distribution of the refractive power, the camera optical lens 10 has better imaging quality and lower sensitivity. Preferably, the camera optical lens 10 satisfies the following condition: 0.90≤f3/f≤1.67.

A central curvature radius of an object-side surface of the third lens is defined as R5; a central curvature radius of an image-side surface of the third lens is defined as R6. The camera optical lens 10 satisfies the following condition: −3.49≤(R5+R6)/(R5−R6)≤−0.47, which can effectively control a shape of the third lens L3 and is better for the shaping of the third lens L3. Within this condition, a deflection degree of the light passing through the lens can be alleviated, and an aberration can be effectively reduced. Preferably, the camera optical lens 10 satisfies the following condition: −2.18≤(R5+R6)/(R5−R6)≤−0.58.

An on-axis thickness of the third lens L3 is defined as d5 the total optical length of the camera optical lens 10 is defined as TTL. The camera optical lens 10 satisfies the following condition: 0.04≤d5/TTL≤0.13. Within this condition, ultra-thinness of the lenses can be realized. Preferably, the camera optical lens 10 satisfies the following condition: 0.07≤d5/TTL≤0.11.

In this embodiment, the fourth lens L4 includes an object-side surface being convex in a paraxial region and an image-side surface being concave in the paraxial region.

The focal length of the camera optical lens 10 is defined as f, and a focal length of the fourth lens L4 is defined as f4. The camera optical lens 10 satisfies the following condition: −1.82≤f4/f≤−0.49. With a reasonable distribution of the focal power, the camera optical lens 10 has better imaging quality and lower sensitivity. Preferably, the camera optical lens 10 satisfies the following condition: −1.14≤f4/f≤−0.62.

A central curvature radius of the object-side surface of the fourth lens L4 is defined as R7, and a central curvature radius of the image-side surface of the fourth lens L4 is defined as R8. The camera optical lens 10 satisfies the following condition: 0.37≤(R7+R8)/(R7−R8)≤1.50, which specifies a shape of the fourth lens L4. Within this condition, the development of the lenses towards ultra-thinness would facilitate correcting the off-axis aberration. Preferably, the camera optical lens 10 satisfies the following condition: 0.59≤(R7+R8)/(R7−R8)≤1.20.

An on-axis thickness of the fourth lens L4 is defined as d7, and the total optical length of the camera optical lens 10 is defined as TTL. The camera optical lens 10 satisfies the following condition: 0.02≤d7/TTL≤0.06. Within this condition, ultra-thinness of the lenses can be realized. Preferably, the camera optical lens 10 satisfies the following condition: 0.03≤d7/TTL≤0.05.

In this embodiment, the fifth lens L5 includes an object-side surface being convex in a paraxial region and an image-side surface being concave in the paraxial region.

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 satisfies the following condition: 1.05≤f5/f≤5.61, which specifies the fifth lens L5 so as to make a light angle of the camera optical lens 10 to be gentle and reduce tolerance sensitivity. Preferably, the camera optical lens 10 satisfies the following condition: 1.68≤f5/f≤4.48.

A central curvature radius of an object-side surface of the fifth lens L5 is defined as R9, and a central curvature radius of an image-side surface of the fifth lens L5 is defined as R10. The camera optical lens 10 satisfies the following condition: −2.19≤(R9+R10)/(R9−R10)≤−0.07, which specifies a shape of the sixth lens L5. Within this condition, the development of the lenses towards ultra-thinness would facilitate correcting the off-axis aberration. Preferably, the camera optical lens 10 satisfies the following condition: −1.37≤(R9+R10)/(R9−R10)≤−0.09.

An on-axis thickness of the fifth lens L5 is defined as d9, and the total optical length of the camera optical lens 10 is defined as TTL. The camera optical lens 10 satisfies the following condition: 0.03≤d9/TTL≤0.09. Within this condition, ultra-thinness of the lenses can be realized. Preferably, the camera optical lens 10 satisfies the following condition: 0.04≤d9/TTL≤0.07.

In this embodiment, the sixth lens L6 includes an object-side surface being concave in a paraxial region and an image-side surface being convex in the paraxial region.

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 satisfies the following condition: 1.16≤f6/f≤14.68. With a reasonable distribution of the focal power, the camera optical lens 10 has better imaging quality and lower sensitivity. Preferably, the camera optical lens 10 satisfies the following condition: 1.85≤f6/f≤11.75.

An on-axis thickness of the sixth lens L6 is defined as d11, and the total optical length of the camera optical lens 10 is defined as TTL. The camera optical lens 10 satisfies the following condition: 0.02≤d11/TTL≤0.09. Within this condition, ultra-thinness of the lenses can be realized. Preferably, the camera optical lens 10 satisfies the following condition: 0.04≤d11/TTL≤0.07.

In this embodiment, the seventh lens L7 includes an object-side surface being concave in a paraxial region and an image-side surface being convex in the paraxial region.

The focal length of the camera optical lens 10 is defined as f, and a focal length of the seventh lens L7 is defined as f7. The camera optical lens 10 satisfies the following condition: −102.11≤f7/f≤3.64. With a reasonable distribution of the focal power, the system has better imaging quality and lower sensitivity. Preferably, the camera optical lens 10 satisfies the following condition: −63.82≤f7/f≤2.91.

A central curvature radius of the object-side surface of the seventh lens L7 is defined as R13, and a central curvature radius of the image-side surface of the seventh lens L7 is defined as R14. The camera optical lens 10 satisfies the following condition: −75.04≤(R13+R14)/(R13−R14)≤5.73, which specifies a shape of the seventh lens L7. Within this condition, the development of the lenses towards ultra-thinness would facilitate correcting the off-axis aberration. Preferably, the camera optical lens 10 satisfies the following condition: −46.90≤(R13+R14)/(R13−R14)≤4.59.

An on-axis thickness of the seventh lens L7 is defined as d13, and the total optical length of the camera optical lens 10 is defined as TTL. The camera optical lens 10 satisfies the following condition: 0.03≤d13/TTL≤0.08. Within this condition, ultra-thinness of the lenses is facilitated. Preferably, the camera optical lens 10 satisfies the following condition: 0.04≤d13/TTL≤0.07.

In this embodiment, the eighth lens L8 includes an object-side surface being concave in a paraxial region and an image-side surface being concave in the paraxial region.

The focal length of the camera optical lens 10 is defined as f, and a focal length of the eighth lens L8 is defined as f8. The camera optical lens 10 satisfies the following condition: −3.14≤f8/f≤−0.46. With a reasonable distribution of the focal power, the system has better imaging quality and lower sensitivity. Preferably, the camera optical lens 10 satisfies the following condition: −1.96≤f8/f≤−0.57.

A central curvature radius of the object-side surface of the eighth lens L8 is defined as R15, and a central curvature radius of the image-side surface of the eighth lens L8 is defined as R16. The camera optical lens 10 satisfies the following condition: 0.23≤(R15+R16)/(R15−R16)≤1.17, which specifies a shape of the eighth lens L8. Within this condition, the development of the lenses towards ultra-thinness would facilitate correcting the off-axis aberration. Preferably, the camera optical lens 10 satisfies the following condition: 0.37≤(R15+R16)/(R15−R16)≤0.94.

An on-axis thickness of the eighth lens L8 is defined as d15 and the total optical length of the camera optical lens 10 is defined as TTL. The camera optical lens 10 satisfies the following condition: 0.03≤d15/TTL≤0.10. Within this condition, ultra-thinness of the lenses can be realized. Preferably, the camera optical lens 10 satisfies the following condition: 0.05≤d15/TTL≤0.08.

In this embodiment, an image height of the camera optical lens 10 is defined as IH, and the focal length of the camera optical lens 10 is defined as f. The camera optical lens 10 satisfies the following condition: f/IH≥2.56, which facilitates achieving a long focal length of the camera optical lens 10.

In this embodiment, an F number of the camera optical lens 10 is defined as FNO. The camera optical lens 10 satisfies the following condition: FNO≤2.00, which facilitates achieving a large aperture of the camera optical lens 10.

In this embodiment, the image height of the camera optical lens 10 is defined as IH, and the total optical length of the camera optical lens 10 is defined as TTL. The camera optical lens 10 satisfies the following condition: TTL/IH≤2.68, which facilitates ultra-thinness of the camera optical lens 10.

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 of the second lens L2 is defined as f12. The camera optical lens 10 satisfies the following condition: 0.45≤f12/f≤1.47. Within this condition, the aberration and distortion of the camera optical lens 10 can be eliminated and a back focal length of the camera optical lens is reduced, thereby maintaining miniaturization of the camera optical lens. Preferably, the camera optical lens 10 satisfies the following condition: 0.71≤f12/f≤1.17.

It should be appreciated that, in other embodiments, configuration of the object-side surfaces and the image-side surfaces of the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7 and the eighth lens L8 may have a distribution in convex and concave other than that of the above-discussed embodiment.

When the above relationships are satisfied, the camera optical lens 10 meets the design requirements of a large aperture, a long focal length and ultra-thinness while having excellent optical imaging performance. Based on the characteristics of the camera optical lens 10, the camera optical lens 10 is particularly applicable to mobile camera lens assemblies and WEB camera lenses composed of such camera elements as CCD and CMOS for high pixels.

The camera optical lens 10 will be further described with reference to the following examples. Symbols used in various examples are shown as follows. The focal length, on-axis distance, central curvature radius, on-axis thickness, inflexion point position, and arrest point position are all in units of mm.

TTL: Total optical length (the distance from the object side surface of the first lens L1 to the image surface S1 of the camera optical lens along the optical axis) in mm.

FNO: ratio of an effective focal length and an entrance pupil diameter of the camera optical lens.

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

The design data of the camera optical lens 10 in Embodiment 1 of the present disclosure are shown in Table 1 and Table 2.

TABLE 1
	R	d	nd	νd
S1	∞	d0=	−0.793
R1	3.094	d1=	1.043	nd1	1.5444	ν1	55.82
R2	11.055	d2=	0.122
R3	−97.929	d3=	0.270	nd2	1.6400	ν2	23.54
R4	41.152	d4=	0.070
R5	6.523	d5=	0.768	nd3	1.5444	ν3	55.82
R6	−36.624	d6=	0.242
R7	13616.122	d7=	0.388	nd4	1.6610	ν4	20.53
R8	4.424	d8=	0.561
R9	20.691	d9=	0.535	nd5	1.6400	ν5	23.54
R10	462.880	d10=	0.798
R11	−18.764	d11=	0.526	nd6	1.6610	ν6	20.53
R12	−8.059	d12=	0.810
R13	−8.835	d13=	0.500	nd7	1.5444	ν7	55.82
R14	−5.171	d14=	0.247
R15	−30.845	d15=	0.608	nd8	1.5444	ν8	55.82
R16	3.803	d16=	0.575
R17	∞	d17=	0.210	ndg	1.5168	νg	64.17
R18	∞	d18=	1.081

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

• • S1: aperture;
  • R: central curvature radius of an optical surface;
  • R1: central curvature radius of the object-side surface of the first lens L1;
  • R2: central curvature radius of the image-side surface of the first lens L1;
  • R3: central curvature radius of the object-side surface of the second lens L2;
  • R4: central curvature radius of the image-side surface of the second lens L2;
  • R5: central curvature radius of the object-side surface of the third lens L3;
  • R6: central curvature radius of the image-side surface of the third lens L3;
  • R7: central curvature radius of the object-side surface of the fourth lens L4;
  • R8: central curvature radius of the image-side surface of the fourth lens L4;
  • R9: central curvature radius of the object-side surface of the fifth lens L5;
  • R10: central curvature radius of the image-side surface of the fifth lens L5;
  • R11: central curvature radius of the object-side surface of the sixth lens L6;
  • R12: central curvature radius of the image-side surface of the sixth lens L6;
  • R13: central curvature radius of the object-side surface of the seventh lens L7;
  • R14: central curvature radius of the image-side surface of the seventh lens L7;
  • R15: central curvature radius of the object-side surface of the eighth lens L8;
  • R16: central curvature radius of the image-side surface of the eighth lens L8;
  • R17: central curvature radius of an object-side surface of the optical filter GF;
  • R18: central 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 L6F;
  • 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 eighth lens L8;
  • d15: on-axis thickness of the eighth lens L8;
  • d16: on-axis distance from the image-side surface of the eighth lens L8 to the object-side surface of the optical filter GF;
  • d17: on-axis thickness of the optical filter GF;
  • d18: on-axis distance from the image-side surface of the optical filter GF to the image surface S1;
  • nd: refractive index of the d line;
  • nd1: refractive index of the d line of the first lens L1;
  • nd2: refractive index of the d line of the second lens L2;
  • nd3: refractive index of the d line of the third lens L3;
  • nd4: refractive index of the d line of the fourth lens L4;
  • nd5: refractive index of the d line of the fifth lens L5;
  • nd6: refractive index of the d line of the sixth lens L6;
  • nd7: refractive index of the d line of the seventh lens L7;
  • nd8: refractive index of the d line of the eighth lens L8;
  • ndg: refractive index of the d line of the optical filter GF;
  • νd: abbe number;
  • ν1: abbe number of the first lens L1;
  • ν2: abbe number of the second lens L2;
  • ν3: abbe number of the third lens L3;
  • ν4: abbe number of the fourth lens L4;
  • ν5: abbe number of the fifth lens L5;
  • ν6: abbe number of the sixth lens L6;
  • ν7: abbe number of the seventh lens L7;
  • ν8: abbe number of the eighth lens L8;
  • νg: abbe number of the optical filter GF.

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

TABLE 2
	Conic
	coefficient	Aspheric surface coefficients
	k	A4	A6	A8	A10	A12
R1	−4.1524E−01	3.9889E−04	−4.6105E−04	3.3466E−04	−1.6896E−04	4.0941E−05
R2	−3.4509E+00	8.6370E−03	−1.0667E−02	6.0005E−03	−1.9663E−03	4.0438E−04
R3	3.7598E+02	2.3805E−02	−1.7776E−02	1.1719E−02	−4.2947E−03	9.7127E−04
R4	3.4515E+02	3.5569E−03	2.9952E−03	8.1836E−04	−7.3682E−04	2.2332E−04
R5	−5.2791E+00	−1.1695E−02	1.5075E−02	−7.8221E−03	2.6343E−03	−5.8802E−04
R6	2.4230E+02	1.4937E−02	−9.7775E−03	4.0733E−03	−1.3953E−03	3.2929E−04
R7	1.5295E+02	6.3271E−03	−1.3394E−02	9.2276E−03	−3.3502E−03	6.6160E−04
R8	−3.5288E+00	−5.9226E−04	−3.1700E−03	6.1967E−03	−2.2464E−03	3.4672E−04
R9	5.3725E+01	−6.7616E−03	−1.7313E−03	1.7666E−03	−1.0698E−03	6.3250E−04
R10	9.9614E+02	−5.2509E−03	−2.1686E−03	−7.4829E−04	5.7735E−04	−2.0964E−04
R11	8.8784E+01	−8.2357E−03	−9.5648E−04	−7.6923E−04	−1.5368E−03	1.1017E−03
R12	5.4166E+00	−8.6718E−03	9.7347E−04	−1.3822E−03	−2.9504E−04	3.5837E−04
R13	2.8527E+00	9.4306E−03	−9.0319E−03	4.5649E−03	−2.7043E−03	9.6770E−04
R14	−4.4055E+01	1.1808E−02	3.1385E−03	−4.3133E−03	1.5011E−03	−2.6922E−04
R15	1.2304E+02	−1.7118E−02	5.4913E−03	−1.5628E−03	3.5029E−04	−4.7606E−05
R16	−1.9815E+01	−2.1883E−02	3.7617E−03	−7.6571E−04	1.1695E−04	−1.2247E−05
	Conic
	coefficient	Aspheric surface coefficients
	k	A14	A16	A18	A20
R1	−4.1524E−01	−6.5423E−06	5.4461E−07	−1.8177E−08	4.2004E−10
R2	−3.4509E+00	−5.2111E−05	3.8217E−06	−1.3223E−07	1.8129E−09
R3	3.7598E+02	−1.3019E−04	9.4680E−06	−3.2100E−07	2.1953E−09
R4	3.4515E+02	−3.1254E−05	2.0758E−06	−4.6434E−08	−1.4659E−08
R5	−5.2791E+00	8.3673E−05	−6.3085E−06	1.3327E−07	5.0161E−09
R6	2.4230E+02	−4.1048E−05	1.9167E−06	−7.1749E−08	2.2140E−08
R7	1.5295E+02	−3.7323E−05	−1.1980E−05	2.3119E−06	−1.1008E−07
R8	−3.5288E+00	7.1598E−05	−3.8907E−05	5.5419E−06	−2.7425E−07
R9	5.3725E+01	−2.0022E−04	3.4469E−05	−2.4137E−06	−2.6295E−08
R10	9.9614E+02	6.1125E−05	−1.0620E−05	6.1464E−07	4.0868E−08
R11	8.8784E+01	−3.2649E−04	4.5681E−05	−2.0726E−06	4.3773E−08
R12	5.4166E+00	−1.0223E−04	1.4366E−05	−1.2364E−06	9.2522E−08
R13	2.8527E+00	−1.8585E−04	1.7442E−05	−7.2468E−07	2.2601E−08
R14	−4.4055E+01	2.6098E−05	−1.3201E−06	2.9340E−08	1.1716E−10
R15	1.2304E+02	3.5227E−06	−1.4108E−07	2.5736E−09	1.3126E−10
R16	−1.9815E+01	7.6911E−07	−2.4020E−08	1.1515E−09	−8.6517E−11

In table 2, K is a conic coefficient, and A4, A6, A8, A10, A12, A14, A16, A18 and A20 are aspheric surface coefficients.y=(x²/R)/{1+[1−(k+1)(x²/R²)]^1/2}+A4x⁴+A6x⁶+A8x⁸+A10x¹⁰+A12x¹²+A14x¹⁴+A16x¹⁶+A18x¹⁸+A20x²⁰  (4)

Herein, x denotes a vertical distance between a point in the aspheric curve and the optical axis, and y denotes an aspheric depth (i.e. a vertical distance between the point having a distance of x from the optical axis and a plane tangent to the vertex on the optical axis of the aspheric surface).

For convenience, an aspheric surface of each lens surface uses the aspheric surfaces shown in the above formula (4). However, the present disclosure is not limited to the aspheric polynomials form shown in the formula (4).

Table 3 and Table 4 show design data of inflexion points and arrest points of each lens of the camera optical lens 10 according to Embodiment 1. 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, P7R1 and P7R2 represent the object-side surface and the image-side surface of the seventh lens L7, and P8R1 and P8R2 represent the object-side surface and the image-side surface of the eighth lens L8. The data in the column named “inflexion point position” refer 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” refer to vertical distances from arrest points arranged on each lens surface to the optical axis of the camera optical lens 10.

	TABLE 3
	Number(s) of	Inflexion	Inflexion	Inflexion
	inflexion	point	point	point
	points	position 1	position 2	position 3
P1R1	1	2.055	/	/
P1R2	1	1.915	/	/
P2R1	1	0.205	/	/
P2R2	1	2.065	/	/
P3R1	0	/	/	/
P3R2	3	0.495	0.885	1.825
P4R1	3	0.525	1.375	1.625
P4R2	0	/	/	/
P5R1	2	0.785	1.185	/
P5R2	1	0.185	/	/
P6R1	1	1.885	/	/
P6R2	1	1.935	/	/
P7R1	1	2.205	/	/
P7R2	3	0.735	1.405	2.575
P8R1	0	/	/	/
P8R2	1	0.745	/	/

	TABLE 4
	Number(s) of	Arrest point
	arrest points	position 1
	P1R1	0	/
	P1R2	0	/
	P2R1	1	0.355
	P2R2	0	/
	P3R1	0	/
	P3R2	0	/
	P4R1	1	0.705
	P4R2	0	/
	P5R1	0	/
	P5R2	1	0.315
	P6R1	0	/
	P6R2	0	/
	P7R1	0	/
	P7R2	0	/
	P8R1	0	/
	P8R2	1	1.515

FIG. 2 and FIG. 3 illustrate a longitudinal aberration and a lateral color of light with wavelengths of 656 nm, 587 nm, 546 nm, 486 nm and 436 nm after passing the camera optical lens 10, respectively. FIG. 4 illustrates a field curvature and a distortion with a wavelength of 546 nm after passing the camera optical lens 10. A field curvature S in FIG. 4 is a field curvature in a sagittal direction, and T is a field curvature in a tangential direction.

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

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

In this Embodiment, an entrance pupil diameter (ENPD) of the camera optical lens 10 is 4.482 mm, an image height of 1.0H is 3.500 mm, and a field of view (FOV) in a diagonal direction is 42.28°. Thus, the camera optical lens 10 achieves a large aperture, a long focal length and ultra-thinness, the on-axis and off-axis chromatic aberration is sufficiently corrected, thereby achieving excellent optical performance.

Embodiment 2

Embodiment 2, is basically the same as Embodiment 1 and involves symbols having the same meanings as Embodiment 1. Only differences are listed below

Embodiment 2 provides a camera optical lens 20 structurally shown in FIG. 5. In this embodiment, the seventh lens has a negative refractive power. The third lens L3 includes an image-side surface being concave in the paraxial region. The fourth lens L4 includes an object-side surface being concave in the paraxial region. The fifth lens L5 includes an image-side surface being convex in the paraxial region.

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=	−0.880
R1	2.904	d1=	1.088	ndl	1.5444	ν1	55.82
R2	10.370	d2=	0.118
R3	−49.934	d3=	0.270	nd2	1.6400	ν2	23.54
R4	35.592	d4=	0.070
R5	5.491	d5=	0.750	nd3	1.5444	ν3	55.82
R6	645.813	d6=	0.076
R7	−65.189	d7=	0.350	nd4	1.6610	ν4	20.53
R8	5.311	d8=	0.598
R9	23.876	d9=	0.519	nd5	1.6400	ν5	23.54
R10	−29.500	d10=	0.942
R11	−9.891	d11=	0.531	nd6	1.6610	ν6	20.53
R12	−7.499	d12=	0.582
R13	−6.135	d13=	0.500	nd7	1.5444	ν7	55.82
R14	−6.471	d14=	0.312
R15	−27.347	d15=	0.600	nd8	1.5444	ν8	55.82
R16	5.252	d16=	0.771
R17	∞	d17=	0.210	ndg	1.5168	νg	64.17
R18	∞	d18=	0.839

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

TABLE 6
	Conic
	coefficient	Aspheric surface coefficients
	k	A4	A6	A8	A10	A12
R1	−4.3167E−01	−3.8356E−05	−3.2498E−04	3.0337E−04	−1.6835E−04	4.1767E−05
R2	−4.3709E+01	8.5843E−03	−9.8477E−03	6.0720E−03	−1.9693E−03	4.0385E−04
R3	−1.0000E+03	2.6575E−02	−1.7853E−02	1.1739E−02	−4.2806E−03	9.7226E−04
R4	2.7057E+02	4.8354E−03	2.9635E−03	8.3018E−04	−7.4656E−04	2.2317E−04
R5	−1.8805E+01	−1.1313E−02	1.5916E−02	−7.8277E−03	2.6319E−03	−5.8915E−04
R6	−1.0000E+03	1.1538E−02	−1.0865E−02	4.1617E−03	−1.3663E−03	3.2696E−04
R7	7.0557E+02	7.5695E−03	−1.2675E−02	9.1913E−03	−3.3920E−03	6.6220E−04
R8	−1.2059E+01	4.3687E−03	4.1277E−04	5.2809E−03	−2.2001E−03	4.1683E−04
R9	9.4470E+01	−6.7616E−03	−1.7313E−03	1.7666E−03	−1.0698E−03	6.3250E−04
R10	1.9369E+02	−5.2509E−03	−2.1686E−03	−7.4829E−04	5.7735E−04	−2.0964E−04
R11	2.4647E+01	−1.1076E−02	−2.4377E−03	−1.7005E−04	−1.5744E−03	1.0781E−03
R12	6.4104E+00	−1.3039E−02	1.6812E−03	−1.2900E−03	−3.2523E−04	3.7004E−04
R13	5.5573E+00	5.2103E−03	−7.0878E−03	4.5655E−03	−2.6761E−03	9.7153E−04
R14	−7.2174E+01	7.5068E−03	3.6412E−03	−4.3190E−03	1.4916E−03	−2.6967E−04
R15	9.1471E+01	−1.2958E−02	4.5190E−03	−1.6638E−03	3.4704E−04	−4.6364E−05
R16	−3.4602E+01	−2.0366E−02	3.4164E−03	−7.6296E−04	1.1787E−04	−1.2363E−05
	Conic
	coefficient	Aspheric surface coefficients
	k	A14	A16	A18	A20
R1	−4.3167E−01	−6.3520E−06	5.7987E−07	−1.5464E−08	−1.0464E−09
R2	−4.3709E+01	−5.2012E−05	3.8434E−06	−1.3374E−07	6.1451E−10
R3	−1.0000E+03	−1.3045E−04	9.3967E−06	−3.2720E−07	2.2606E−09
R4	2.7057E+02	−3.0624E−05	2.2121E−06	−5.0541E−08	−2.5912E−08
R5	−1.8805E+01	8.3154E−05	−6.4102E−06	1.2830E−07	8.4518E−09
R6	−1.0000E+03	−4.2575E−05	1.7746E−06	−2.5744E−08	3.6334E−08
R7	7.0557E+02	−3.5665E−05	−1.1922E−05	2.2469E−06	−7.5471E−08
R8	−1.2059E+01	7.6778E−05	−4.3567E−05	4.0905E−06	2.0648E−07
R9	9.4470E+01	−2.0022E−04	3.4469E−05	−2.4137E−06	−2.6295E−08
R10	1.9369E+02	6.1125E−05	−1.0620E−05	6.1464E−07	4.0868E−08
R11	2.4647E+01	−3.2356E−04	4.8491E−05	−1.4919E−06	−1.1866E−07
R12	6.4104E+00	−9.8006E−05	1.3790E−05	−1.6699E−06	1.7926E−07
R13	5.5573E+00	−1.8720E−04	1.7022E−05	−7.3351E−07	4.4314E−08
R14	−7.2174E+01	2.6316E−05	−1.2700E−06	3.1838E−08	−1.0621E−09
R15	9.1471E+01	3.7936E−06	−1.1430E−07	2.7001E−09	−5.6330E−10
R16	−3.4602E+01	7.5174E−07	−2.3552E−08	1.4363E−09	−9.1184E−11

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

	TABLE 7
	Number(s) of	Inflexion	Inflexion
	inflexion	point	point
	points	position 1	position 2
	P1R1	0	/	/
	P1R2	0	/	/
	P2R1	1	0.265	/
	P2R2	1	2.045	/
	P3R1	0	/	/
	P3R2	2	0.815	1.845
	P4R1	1	1.195	/
	P4R2	0	/	/
	P5R1	2	0.735	1.195
	P5R2	0	/	/
	P6R1	1	1.795	/
	P6R2	1	1.845	/
	P7R1	1	2.115	/
	P7R2	2	0.765	1.235
	P8R1	1	2.365	/
	P8R2	1	0.695	/

	TABLE 8
	Number(s) of	Arrest point
	arrest points	position 1
	P1R1	0	/
	P1R2	0	/
	P2R1	1	0.475
	P2R2	0	/
	P3R1	0	/
	P3R2	1	1.105
	P4R1	1	1.625
	P4R2	0	/
	P5R1	0	/
	P5R2	0	/
	P6R1	0	/
	P6R2	0	/
	P7R1	0	/
	P7R2	0	/
	P8R1	0	/
	P8R2	0	1.345

FIG. 6 and FIG. 7 illustrate a longitudinal aberration and a lateral color of light with wavelengths of 656 nm, 587 nm, 546 nm, 486 nm and 436 nm after passing the camera optical lens 20, respectively. FIG. 8 illustrates a field curvature and a distortion of light with a wavelength of 546 nm after passing the camera optical lens 20. A field curvature S in FIG. 8 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, an entrance pupil diameter (ENPD) of the camera optical lens 20 is 4.482 mm, an image height of 1.0H is 3.500 mm, and a field of view (FOV) in the diagonal direction is 42.20°. Thus, the camera optical lens 20 achieves a large aperture, a long focal length and ultra-thinness, the on-axis and off-axis aberration is sufficiently corrected, thereby achieving excellent optical performance.

Embodiment 3

Embodiment 3 is basically the same as Embodiment 1 and involves symbols having the same meanings as Embodiment 1. Only differences are listed below.

Embodiment 3 provides a camera optical lens 30 structurally shown in FIG. 9. In this embodiment, the seventh lens has a negative refractive power. The third lens L3 includes an image-side surface being concave in the paraxial region. The fourth lens L4 includes an object-side surface being concave in the paraxial region.

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=	−0.906
R1	2.815	d1=	1.119	nd1	1.5444	ν1	55.82
R2	14.159	d2=	0.105
R3	−27.672	d3=	0.270	nd2	1.6400	ν2	23.54
R4	31.106	d4=	0.070
R5	5.114	d5=	0.791	nd3	1.5444	ν3	55.82
R6	18.853	d6=	0.070
R7	−42.873	d7=	0.350	nd4	1.6610	ν4	20.53
R8	6.312	d8=	0.522
R9	11.923	d9=	0.500	nd5	1.6400	ν5	23.54
R10	460.938	d10=	1.212
R11	−9.645	d11=	0.430	nd6	1.6610	ν6	20.53
R12	−8.438	d12=	0.110
R13	−5.349	d13=	0.500	nd7	1.5444	ν7	55.82
R14	−10.587	d14=	0.497
R15	−28.711	d15=	0.597	nd8	1.5444	ν8	55.82
R16	10.669	d16=	0.747
R17	∞	d17=	0.210	ndg	1.5168	νg	64.17
R18	∞	d18=	0.814

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

TABLE 10
	Conic
	coefficient	Aspheric surface coefficients
	k	A4	A6	A8	A10	A12
R1	−4.8346E−01	−2.2976E−04	−2.5674E−04	2.5344E−04	−1.6766E−04	4.2167E−05
R2	−2.4736E+01	8.1964E−03	−9.2934E−03	6.0802E−03	−1.9713E−03	4.0314E−04
R3	−1.0001E+03	2.9878E−02	−1.8034E−02	1.1832E−02	−4.2668E−03	9.7251E−04
R4	1.8973E+02	7.5745E−03	3.2547E−03	7.7330E−04	−7.4858E−04	2.2620E−04
R5	−2.6287E+01	−6.3052E−03	1.6570E−02	−7.8381E−03	2.6005E−03	−5.9869E−04
R6	−8.1156E+02	7.2038E−03	−1.0863E−02	4.2743E−03	−1.3543E−03	3.2319E−04
R7	8.7223E+01	4.2720E−03	−1.1406E−02	9.225 IE−03	−3.4225E−03	6.6044E−04
R8	−1.8969E+01	1.3626E−02	−4.0162E−04	5.8703E−03	−2.0300E−03	3.9741E−04
R9	3.3620E+01	−6.7616E−03	−1.7313E−03	1.7666E−03	−1.0698E−03	6.3250E−04
R10	−9.9996E+02	−5.2509E−03	−2.1686E−03	−7.4829E−04	5.7735E−04	−2.0964E−04
R11	2.4355E+01	−1.5366E−02	−6.1845E−03	−2.6685E−04	−1.9105E−03	1.0463E−03
R12	1.1460E+01	−3.4973E−02	4.7241E−03	−1.3548E−03	−3.4786E−04	3.4328E−04
R13	4.7035E+00	−2.6802E−02	6.0381E−03	4.0313E−03	−2.8171E−03	9.3683E−04
R14	−1.3903E+02	2.6127E−03	5.4661E−03	−4.3293E−03	1.4402E−03	−2.7396E−04
R15	5.1412E+01	−9.6145E−03	4.2030E−03	−1.7640E−03	3.4885E−04	−4.5063E−05
R16	−1.0435E+02	−1.8825E−02	3.4027E−03	−8.5022E−04	1.1558E−04	−1.1448E−05
	Conic
	coefficient	Aspheric surface coefficients
	k	A14	A16	A18	A20
R1	−4.8346E−01	−6.3087E−06	5.7992E−07	−1.6156E−08	−1.2043E−09
R2	−2.4736E+01	−5.2357E−05	3.7606E−06	−1.4007E−07	4.6097E−09
R3	−1.0001E+03	−1.3059E−04	9.3784E−06	−3.3399E−07	−3.2109E−09
R4	1.8973E+02	−3.0063E−05	2.1799E−06	−8.7234E−08	−3.3881E−08
R5	−2.6287E+01	8.1969E−05	−6.3379E−06	1.7823E−07	7.3079E−09
R6	−8.1156E+02	−4.4463E−05	1.5651E−06	3.4760E−08	4.4610E−08
R7	8.7223E+01	−3.4732E−05	−1.2001E−05	2.1332E−06	−3.2268E−08
R8	−1.8969E+01	6.4069E−05	−4.5452E−05	4.5212E−06	6.7655E−07
R9	3.3620E+01	−2.0022E−04	3.4469E−05	−2.4137E−06	−2.6295E−08
R10	−9.9996E+02	6.1125E−05	−1.0620E−05	6.1464E−07	4.0868E−08
R11	2.4355E+01	−2.9743E−04	6.1740E−05	4.1305E−07	−1.0373E−06
R12	1.1460E+01	−1.0865E−04	1.1944E−05	−1.3278E−06	5.7114E−07
R13	4.7035E+00	−2.0203E−04	1.3400E−05	−7.1873E−07	4.8951E−07
R14	−1.3903E+02	2.6965E−05	−1.0750E−06	4.4665E−08	−5.4036E−09
R15	5.1412E+01	3.8955E−06	−1.2037E−07	4.5364E−10	−3.9575E−10
R16	−1.0435E+02	8.0866E−07	−3.4414E−08	−2.6776E−10	1.6949E−10

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

	TABLE 11
	Number(s) of	Inflexion	Inflexion
	inflexion	point	point
	points	position 1	position 2
	P1R1	0	/	/
	P1R2	1	2.135	/
	P2R1	2	0.315	2.085
	P2R2	1	1.975	/
	P3R1	1	1.795	/
	P3R2	2	0.725	1.915
	P4R1	1	1.155	/
	P4R2	0	/	/
	P5R1	0	/	/
	P5R2	1	0.185	/
	P6R1	1	1.665	/
	P6R2	1	1.765	/
	P7R1	1	1.895	/
	P7R2	2	0.785	1.295
	P8R1	1	2.315	/
	P8R2	2	0.575	2.725

	TABLE 12
	Number(s) of	Arrest point
	arrest points	position 1
	P1R1	0	/
	P1R2	0	/
	P2R1	1	0.575
	P2R2	0	/
	P3R1	0	/
	P3R2	1	1.155
	P4R1	1	1.575
	P4R2	0	/
	P5R1	0	/
	P5R2	1	0.315
	P6R1	0	/
	P6R2	0	/
	P7R1	0	/
	P7R2	0	/
	P8R1	0	/
	P8R2	1	1.055

FIG. 10 and FIG. 11 illustrate a longitudinal aberration and a lateral color of light with wavelengths of 656 nm, 587 nm, 546 nm, 486 nm and 436 nm after passing the camera optical lens 30, respectively. FIG. 12 illustrates a field curvature and a distortion of light with a wavelength of 546 nm after passing the camera optical lens 30. A field curvature S in FIG. 12 is a field curvature in a sagittal direction, and T is a field curvature in a tangential direction.

Table 13 in the following shows values corresponding to the conditions according to the above conditions in the embodiments. Apparently, the camera optical lens 30 in the present embodiment satisfies the above conditions.

In this embodiment, an entrance pupil diameter (ENPD) of the camera optical lens 30 is 4.510 mm, an image height of 1.0H is 3.500 mm, and a field of view (FOV) in the diagonal direction is 42.08°. Thus, the camera optical lens 30 achieves a large aperture, a long focal length and ultra-thinness, the on-axis and off-axis aberration is sufficiently corrected, thereby achieving excellent optical performance.

TABLE 13
Parameters
and conditions	Embodiment 1	Embodiment 2	Embodiment 3
f/TTL	0.96	0.98	1.01
f2/f	−5.00	−3.58	−2.51
(R11 + R12)/	2.51	7.27	14.98
(R11 − R12)
f	8.963	8.963	9.020
f1	7.509	7.015	6.209
f2	−44.793	−32.108	−22.615
f3	10.191	10.125	12.579
f4	−6.619	−7.330	−8.205
f5	33.492	20.493	18.927
f6	20.720	42.57	88.290
f7	21.761	−457.621	−20.467
f8	−6.154	−8.006	−14.152
f12	8.756	8.585	8.043
FNO	2.00	2.00	2.00
TTL	9.354	9.126	8.914
IH	3.500	3.500	3.500
FOV	42.28°	42.20°	42.08°

It will be understood by those of ordinary skill in the art that the embodiments described above are specific examples realizing the present disclosure, and that in practical applications, various changes may be made thereto in form and in detail without departing from the range and scope of the disclosure.

Claims

1. A camera optical lens comprising from an object side to an image side in sequence: a first lens having a positive refractive power, a second lens having a negative refractive power, a third lens having a positive refractive power, a fourth lens having a negative refractive power, a fifth lens having a positive refractive power, a sixth lens having a positive refractive power, a seventh lens, and an eighth lens having a negative refractive power; wherein the camera optical lens satisfies the following conditions: 0.95≤f/TTL; −5.00≤f2/f≤−2.50; and2.50≤(R11+R12)/(R11−R12)≤15.00;whereTTL denotes 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;f denotes a focal length of the camera optical lens;f2 denotes a focal length of the second lens;R11 denotes a central curvature radius of an object-side surface of the sixth lens; andR12 denotes a central curvature radius of an image-side surface of the sixth lens.

2. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies the following condition: 3.00≤d5/d6≤12.00;whered5 denotes an on-axis thickness of the third lens; andd6 denotes an on-axis distance from an image-side surface of the third lens to an object-side surface of the fourth lens.

3. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies the following conditions: 0.34≤f1/f≤1.26;−3.56≤(R1+R2)/(R1−R2)≤−1.00; and0.06≤d1/TTL≤0.19;wheref1 denotes a focal length of the first lens;R1 denotes a central curvature radius of an object-side surface of the first lens;R2 denotes a central curvature radius of an image-side surface of the first lens; andd1 denotes an on-axis thickness of the first lens.

4. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies the following conditions: −0.12≤(R3+R4)/(R3−R4)≤0.61; and0.01≤d3/TTL≤0.05;whereR3 denotes a central curvature radius of an object-side surface of the second lens;R4 denotes a central curvature radius of an image-side surface of the second lens; andd3 denotes an on-axis thickness of the second lens.

5. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies the following conditions: 0.56≤f3/f≤2.09;−3.49≤(R5+R6)/(R5−R6)≤−0.47; and0.04≤d5/TTL≤0.13;wheref3 denotes a focal length of the third lens;R5 denotes a central curvature radius of an object-side surface of the third lens;R6 denotes a central curvature radius of an image-side surface of the third lens; andd5 denotes an on-axis thickness of the third lens.

6. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies the following conditions: −1.82≤f4/f≤−0.49;0.37≤(R7+R8)/(R7−R8)≤1.50; and0.02≤d7/TTL wheref4 denotes a focal length of the fourth lens;R7 denotes a central curvature radius of an object-side surface of the fourth lens;R8 denotes a central curvature radius of an image-side surface of the fourth lens; andd7 denotes an on-axis thickness of the fourth lens.

7. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies the following conditions: 1.05≤f5/f≤5.61;−2.19≤(R9+R10)/(R9−R10)≤−0.07; and0.03≤d9/TTL≤0.09;wheref5 denotes a focal length of the fifth lens;R9 denotes a central curvature radius of an object-side surface of the fifth lens;R10 denotes a central curvature radius of an image-side surface of the fifth lens; andd9 denotes an on-axis thickness of the fifth lens.

8. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies the following conditions: 1.16≤f6/f≤14.68; and0.02≤d11/TTL≤0.09;wheref6 denotes a focal length of the sixth lens; andd11 denotes an on-axis thickness of the sixth lens.

9. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies the following conditions: −102.11≤f7/f≤3.64;−75.04≤(R13+R14)/(R13−R14)≤5.73; and0.03≤d13/TTL≤0.08;wheref7 denotes a focal length of the seventh lens;R13 denotes a central curvature radius of an object-side surface of the seventh lens;R14 denotes a central curvature radius of an image-side surface of the seventh lens; andd13 denotes an on-axis thickness of the seventh lens.

10. The camera optical lens according to claim 1, wherein the camera optical lens further satisfies the following conditions: −3.14≤f8/f≤−0.46;0.23≤(R15+R16)/(R15−R16)≤1.17; and0.03≤d15/TTL≤0.10;wheref8 denotes a focal length of the eighth lens;R15 denotes a central curvature radius of an object-side surface of the eighth lens;R16 denotes a central curvature radius of an image-side surface of the eighth lens; andd15 denotes an on-axis thickness of the eighth lens.