WO2021128392A1 - Optical camera lens - Google Patents

Abstract

Disclosed is an optical camera lens (10, 20, 30). The optical camera lens (10, 20, 30) sequentially comprises, from an object side to an image side: 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); and satisfies the following relational expressions: f1 ≥ 0; 3.00 ≤ f2/f≤ 8.00; 1.55 ≤ n6 ≤ 1.70; and 2.50 ≤ (R9+R10)/(R9-R10) ≤ 11.00. The optical camera lens (10, 20, 30) has good optical performance, and meets the requirements of a large aperture, a wide angle and ultra-thinness.

Description

Camera optical lens Technical field

The present invention relates to the field of optical lenses, in particular to an imaging optical lens suitable for portable terminal equipment such as smart phones and digital cameras, as well as imaging devices such as monitors and PC lenses.

Background technique

In recent years, with the rise of smart phones, the demand for miniaturized photographic lenses has increased. The photosensitive devices of general photographic lenses are nothing more than photosensitive coupled devices (CCD) or complementary metal oxide semiconductor devices (Complementary Metal). -OxideSemiconductor Sensor, CMOS Sensor), and due to the improvement of semiconductor manufacturing technology, the pixel size of photosensitive devices has been reduced, and the development trend of current electronic products with good functions, thin and short appearance, therefore, has a good The miniaturized camera lens with image quality has become the mainstream in the current market. In order to obtain better imaging quality, the lenses traditionally mounted on mobile phone cameras mostly adopt a three-element or four-element lens structure. Moreover, with the development of technology and the increase of diversified needs of users, as the pixel area of photosensitive devices continues to shrink and the system's requirements for image quality continue to increase, six-element, seven-element, and eight-element lens structures Gradually appeared in the lens design. There is an urgent need for an ultra-thin wide-angle camera optical lens with excellent optical characteristics.

Summary of the invention

In view of the above-mentioned problems, the object of the present invention is to provide an imaging optical lens that can meet the requirements of ultra-thin and wide-angle while obtaining high imaging performance.

In order to solve the above technical problems, an embodiment of the present invention provides an imaging optical lens. The imaging optical lens includes a first lens, a second lens, a third lens, and a fourth lens in order from the object side to the image side. , The fifth lens, the sixth lens, the seventh lens, and the eighth lens;

The focal length of the imaging optical lens is f, the focal length of the first lens is f1, the focal length of the second lens is f2, the refractive index of the sixth lens is n6, and the curvature of the object side of the fifth lens The radius is R9, and the radius of curvature of the image side surface of the fifth lens is R10, which satisfies the following relationship:

f1≥0;

3.00≤f2/f≤8.00;

1.55≤n6≤1.70;

2.50≤(R9+R10)/(R9-R10)≤11.00.

Preferably, the focal length of the fifth lens is f5, and satisfies the following relationship:

-14.00≤f5/f≤-1.70.

Preferably, the radius of curvature of the object side surface of the first lens is R1, the radius of curvature of the image side surface of the first lens is R2, the axial thickness of the first lens is d1, and the total optical length of the imaging optical lens is TTL, and satisfies the following relationship:

1.24≤f1/f≤4.09;

-7.11≤(R1+R2)/(R1-R2)≤-2.25;

0.02≤d1/TTL≤0.05.

Preferably, the radius of curvature of the object side surface of the second lens is R3, the radius of curvature of the image side surface of the second lens is R4, the axial thickness of the second lens is d3, and the total optical length of the imaging optical lens is TTL, and satisfies the following relationship:

0.25≤(R3+R4)/(R3-R4)≤33.61;

0.02≤d3/TTL≤0.12.

Preferably, the focal length of the third lens is f3, the radius of curvature of the object side of the third lens is R5, the radius of curvature of the image side of the third lens is R6, and the on-axis thickness of the third lens is d5 , The total optical length of the camera optical lens is TTL, and satisfies the following relationship:

0.25≤f3/f≤1.26;

-1.79≤(R5+R6)/(R5-R6)≤-0.50;

0.02≤d5/TTL≤0.11.

Preferably, the focal length of the fourth lens is f4, the radius of curvature of the object side of the fourth lens is R7, the radius of curvature of the image side of the fourth lens is R8, and the on-axis thickness of the fourth lens is d7 , The total optical length of the camera optical lens is TTL, and satisfies the following relationship:

-1.66≤f4/f≤-0.47;

0.15≤(R7+R8)/(R7-R8)≤1.16;

0.02≤d7/TTL≤0.05.

Preferably, the focal length of the sixth lens is f6, the radius of curvature of the object side of the sixth lens is R11, the radius of curvature of the image side of the sixth lens is R12, and the on-axis thickness of the sixth lens is d11 , The total optical length of the camera optical lens is TTL, and satisfies the following relationship:

-620.79≤f6/f≤1.82;

-23.44≤(R11+R12)/(R11-R12)≤0.02;

0.05≤d11/TTL≤0.15.

Preferably, the focal length of the seventh lens is f7, the radius of curvature of the object side of the seventh lens is R13, the radius of curvature of the image side of the seventh lens is R14, and the axial thickness of the seventh lens is d13 , The total optical length of the camera optical lens is TTL, and satisfies the following relationship:

-19.28≤f7/f≤31.58;

-104.51≤(R13+R14)/(R13-R14)≤-1.73;

0.05≤d13/TTL≤0.15.

Preferably, the focal length of the eighth lens is f8, the radius of curvature of the object side of the eighth lens is R15, the radius of curvature of the image side of the eighth lens is R16, and the on-axis thickness of the eighth lens is d15 , The total optical length of the camera optical lens is TTL, and satisfies the following relationship:

-4.02≤f8/f≤-0.79;

0.73≤(R15+R16)/(R15-R16)≤4.08;

0.03≤d15/TTL≤0.15.

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

0.69≤f12/f≤3.21.

The beneficial effect of the present invention is that the imaging optical lens according to the present invention has excellent optical characteristics, meets the requirements of large aperture, ultra-thin and wide-angle, and is especially suitable for mobile phones composed of high-pixel CCD, CMOS and other imaging elements. Camera lens assembly and WEB camera lens.

Description of the drawings

FIG. 1 is a schematic diagram of the structure of an imaging optical lens according to a first embodiment of the present invention;

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

3 is a schematic diagram of the chromatic aberration of magnification of the imaging optical lens shown in FIG. 1;

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

5 is a schematic diagram of the structure of an imaging optical lens according to a second embodiment of the present invention;

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

FIG. 7 is a schematic diagram of the chromatic aberration of magnification of the imaging optical lens shown in FIG. 5;

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

9 is a schematic diagram of the structure of an imaging optical lens according to a third embodiment of the present invention;

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

11 is a schematic diagram of the chromatic aberration of magnification of the imaging optical lens shown in FIG. 9;

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

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the various embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, a person of ordinary skill in the art can understand that, in each embodiment of the present invention, many technical details are proposed for the reader to better understand the present invention. However, even without these technical details and various changes and modifications based on the following embodiments, the technical solution claimed by the present invention can be realized.

(First embodiment)

With reference to the drawings, the present invention provides an imaging optical lens 10. FIG. 1 shows an imaging optical lens 10 according to a first embodiment of the present invention. The imaging optical lens 10 includes eight lenses. Specifically, the imaging optical lens 10 includes in order from the object side to the image side: a first lens L1, a second lens L2, a third lens L3, an aperture S1, a fourth lens L4, a fifth lens L5, and a sixth lens. Lens L6, seventh lens L7, and eighth lens L8. An optical element such as an optical filter GF may be provided between the eighth lens L8 and the image plane Si.

The focal length of the first lens L1 is defined as f1, f1≥0, the first lens L1 has a positive refractive power, and the reasonable allocation of the focal length enables the system to have better imaging quality and lower sensitivity. Preferably, f1≥9.93 is satisfied.

Define the focal length of the overall imaging optical lens 10 as f, the focal length of the second lens L2 is f2, 3.00≤f2/f≤8.00, which specifies the ratio of the focal length of the second lens L2 to the total focal length of the system, which can effectively balance the system’s Ball difference and curvature of field. Preferably, 3.01≤f2/f≤8.00 is satisfied.

The refractive index of the sixth lens L6 is defined as n6, 1.55≦n6≦1.70, and the refractive index of the sixth lens L6 is specified, which helps to improve the performance of the optical system within the range of the conditional expression. Preferably, 1.56≤n6≤1.69 is satisfied.

Define the radius of curvature of the object side surface of the fifth lens L5 as R9, and the radius of curvature of the image side surface of the fifth lens L5 as R10, 2.50≤(R9+R10)/(R9-R10)≤11.00, which specifies the fifth lens The shape of L5, within the range specified by the conditional formula, can ease the deflection of light passing through the lens and effectively reduce aberrations. Preferably, it satisfies 2.50≤(R9+R10)/(R9-R10)≤10.99.

When the focal length of the imaging optical lens 10, the focal length of each lens, the on-axis distance from the image side of the related lens to the object side, and the on-axis thickness satisfy the above-mentioned relational expressions, the imaging optical lens 10 can have excellent optical characteristics. Provides a large aperture, wide-angle, ultra-thin optical camera lens with good optical performance.

The focal length of the fifth lens L5 is defined as f5, -14.00≤f5/f≤-1.70, and the ratio of the focal length of the fifth lens L5 to the total focal length of the system is specified. The reasonable allocation of the focal length makes the system have better imaging quality And lower sensitivity. Preferably, -13.99≤f5/f≤-1.71 is satisfied.

The focal length of the first lens L1 is f1, which satisfies the following relationship: 1.24≤f1/f≤4.09, which specifies the ratio of the focal length of the first lens L1 to the overall focal length. When within the specified range, the first lens L1 has an appropriate positive refractive power, which is beneficial to reduce system aberrations, and at the same time, is beneficial to the development of ultra-thin and wide-angle lenses. Preferably, 1.99≤f1/f≤3.27 is satisfied.

The curvature radius of the object side surface of the first lens L1 is R1, and the curvature radius of the image side surface of the first lens L1 is R2, which satisfies the following relationship: -7.11≤(R1+R2)/(R1-R2)≤-2.25 , Reasonably control the shape of the first lens L1, so that the first lens L1 can effectively correct the system spherical aberration. Preferably, -4.45≤(R1+R2)/(R1-R2)≤-2.81 is satisfied.

The axial thickness of the first lens L1 is d1, and the total optical length of the imaging optical lens is TTL, which satisfies the following relationship: 0.02≤d1/TTL≤0.05, which is conducive to achieving ultra-thinness. Preferably, 0.03≤d1/TTL≤0.04 is satisfied.

The curvature radius of the object side surface of the second lens L2 is R3, and the curvature radius of the image side surface of the second lens L2 is R4, which satisfies the following relationship: 0.25≤(R3+R4)/(R3-R4)≤33.61, which is specified When the shape of the second lens L2 is within the range, as the lens becomes ultra-thin and wide-angle, it is beneficial to correct the problem of axial chromatic aberration. Preferably, 0.40≤(R3+R4)/(R3-R4)≤26.89 is satisfied.

The on-axis thickness of the second lens L2 is d3, which satisfies the following relationship: 0.02≤d3/TTL≤0.12, which is beneficial to realize ultra-thinness. Preferably, 0.03≤d3/TTL≤0.09 is satisfied.

The focal length of the third lens L3 is f3, and satisfies the following relationship: 0.25≤f3/f≤1.26. The reasonable distribution of optical power enables the system to have better imaging quality and lower sensitivity. Preferably, 0.39≤f3/f≤1.01 is satisfied.

The curvature radius of the object side surface of the third lens L3 is R5, and the curvature radius of the image side surface of the third lens L3 is R6, which satisfies the following relationship: -1.79≤(R5+R6)/(R5-R6)≤-0.50, which can be effectively controlled The shape of the third lens L3 is conducive to the molding of the third lens L3. Within the specified range of the conditional formula, the degree of deflection of the light passing through the lens can be eased, and aberrations can be effectively reduced. Preferably, -1.12≤(R5+R6)/(R5-R6)≤-0.62 is satisfied.

The on-axis thickness of the third lens L3 is d5, which satisfies the following relationship: 0.02≤d5/TTL≤0.11, which is beneficial to realize ultra-thinness. Preferably, 0.04≤d5/TTL≤0.09 is satisfied.

The focal length of the fourth lens L4 is f4 and satisfies the following relationship: -1.66≤f4/f≤-0.47. The reasonable distribution of the optical power enables the system to have better imaging quality and lower sensitivity. Preferably, -1.04≤f4/f≤-0.58 is satisfied.

The curvature radius of the object side surface of the fourth lens L4 is R7, and the curvature radius of the image side surface of the fourth lens L4 is R8, which satisfies the following relationship: 0.15≤(R7+R8)/(R7-R8)≤1.16, which is specified This is the shape of the fourth lens L4. When it is within the range, with the development of ultra-thin and wide-angle, it is beneficial to correct the aberration of the off-axis angle of view. Preferably, 0.25≤(R7+R8)/(R7-R8)≤0.92 is satisfied.

The on-axis thickness of the fourth lens L4 is d7, which satisfies the following relationship: 0.02≤d7/TTL≤0.05, which is beneficial to realize ultra-thinness. Preferably, 0.03≤d7/TTL≤0.04 is satisfied.

The on-axis thickness of the fifth lens L5 is d9, which satisfies the following relationship: 0.02≤d9/TTL≤0.05, which is beneficial to realize ultra-thinness. Preferably, 0.03≤d9/TTL≤0.04 is satisfied.

The focal length of the overall imaging optical lens 10 is f, and the focal length of the sixth lens L6 is f6, which satisfies the following relationship: -620.79≤f6/f≤1.82. Through the reasonable distribution of optical power, the system has better imaging quality and comparison. Low sensitivity. Preferably, -387.99≤f6/f≤1.46 is satisfied.

The curvature radius R11 of the object side surface of the sixth lens L6 and the curvature radius R12 of the image side surface of the sixth lens L6 satisfy the following relationship: -23.44≤(R11+R12)/(R11-R12)≤0.02, the sixth lens is specified When the shape of L6 is within the range of conditions, with the development of ultra-thin and wide-angle, it is conducive to correcting the aberration of the off-axis angle of view. Preferably, -14.65≤(R11+R12)/(R11-R12)≤0.02 is satisfied.

The on-axis thickness of the sixth lens L6 is d11, which satisfies the following relationship: 0.05≤d11/TTL≤0.15, which is beneficial to realize ultra-thinness. Preferably, 0.08≤d11/TTL≤0.12 is satisfied.

The focal length of the overall imaging optical lens 10 is f, and the focal length of the seventh lens L7 is f7, which satisfies the following relationship: -19.28≤f7/f≤31.58. Through the reasonable distribution of optical power, the system has better imaging quality and lower image quality. Sensitivity. Preferably, -12.05≤f7/f≤25.26 is satisfied.

The curvature radius R13 of the object side surface of the seventh lens L7 and the curvature radius R14 of the image side surface of the seventh lens L7 satisfy the following relationship: -104.51≤(R13+R14)/(R13-R14)≤-1.73, and the seventh lens is specified When the shape of the lens L7 is within the range of conditions, with the development of ultra-thin and wide-angle, it is beneficial to correct the aberration of the off-axis angle of view. Preferably, -65.32≤(R13+R14)/(R13-R14)≤-2.17 is satisfied.

The on-axis thickness of the seventh lens L7 is d13, which satisfies the following relationship: 0.05≤d13/TTL≤0.15, which is beneficial to realize ultra-thinness. Preferably, 0.08≤d13/TTL≤0.12 is satisfied.

The focal length of the overall imaging optical lens 10 is f, and the focal length of the eighth lens L8 is f8, which satisfies the following relationship: -4.02≤f8/f≤-0.79. Through the reasonable distribution of optical power, the system has better imaging quality and comparison. Low sensitivity. Preferably, -2.51≤f8/f≤-0.99 is satisfied.

The curvature radius R15 of the object side surface of the eighth lens L8 and the curvature radius R16 of the image side surface of the eighth lens L8 satisfy the following relationship: 0.73≤(R15+R16)/(R15-R16)≤4.08, the eighth lens L8 is specified When the shape is within the range of conditions, with the development of ultra-thin and wide-angle, it is beneficial to correct the aberration of the off-axis angle of view. Preferably, 1.17≤(R15+R16)/(R15-R16)≤3.26 is satisfied.

The on-axis thickness of the eighth lens L8 is d15, which satisfies the following relationship: 0.03≤d15/TTL≤0.15, which is beneficial to realize ultra-thinness. Preferably, 0.06≤d15/TTL≤0.12 is satisfied.

In this embodiment, the combined focal length of the first lens L1 and the second lens L2 is defined as f12, which satisfies the following relational expression: 0.69≤f12/f≤3.21. Within the range of the conditional expression, the imaging optics can be eliminated The aberration and distortion of the lens 10 can suppress the back focal length of the imaging optical lens 10 and maintain the miniaturization of the image lens system group. Preferably, 1.11≤f12/f≤2.57.

In this embodiment, the ratio between the total optical length TTL of the imaging optical lens 10 and the image height IH of the imaging optical lens 10 satisfies the following relationship: TTL/IH≤1.62, which is conducive to achieving ultra-thinness.

In this embodiment, the angle of view FOV of the imaging optical lens 10 in the diagonal direction is greater than or equal to 69°, which is beneficial to realize a wide angle.

In this embodiment, the aperture F number Fno of the imaging optical lens 10 is less than or equal to 1.65, the aperture is large, and the imaging performance is good.

With such a design, the overall optical length TTL of the overall imaging optical lens 10 can be shortened as much as possible, and the characteristics of miniaturization can be maintained.

The imaging optical lens 10 of the present invention will be described below with an example. The symbols described in each example are as follows. The unit of focal length, distance on axis, radius of curvature, thickness on axis, position of inflection point, and position of stagnation point is mm.

TTL: total optical length (the on-axis distance from the object side of the first lens L1 to the imaging surface), the unit is mm;

Preferably, the object side and/or the image side of the lens can also be provided with inflection points and/or stagnation points to meet high-quality imaging requirements. For specific implementations, refer to the following.

Table 1 and Table 2 show design data of the imaging optical lens 10 according to the first embodiment of the present invention.

【Table 1】

Among them, the meaning of each symbol is as follows.

S1: aperture;

R: The radius of curvature of the optical surface, and the radius of curvature of the center of the lens;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

R15: the radius of curvature of the object side of the eighth lens L8;

R16: the radius of curvature of the image side surface of the eighth lens L8;

R17: the radius of curvature of the object side of the optical filter GF;

R18: the radius of curvature of the image side surface of the optical filter GF;

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

d15: the on-axis thickness of the eighth lens L8;

d16: the on-axis distance from the image side surface of the eighth lens L8 to the object side surface of the optical filter GF;

d17: the axial thickness of the optical filter GF;

d18: the on-axis distance from the image side surface of the optical filter GF to the image surface;

nd: refractive index of d-line;

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

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

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

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

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

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

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

nd8: the refractive index of the d-line of the eighth lens L8;

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

vd: Abbe number;

v1: Abbe number of the first lens L1;

v2: Abbe number of the second lens L2;

v3: Abbe number of the third lens L3;

v4: Abbe number of the fourth lens L4;

v5: Abbe number of the fifth lens L5;

v6: Abbe number of the sixth lens L6;

v7: Abbe number of the seventh lens L7;

v8: Abbe number of the eighth lens L8;

vg: Abbe number of optical filter GF.

Table 2 shows the aspheric surface data of each lens in the imaging optical lens 10 of the first embodiment of the present invention.

Among them, k is the conic coefficient, and A4, A6, A8, A10, A12, A14, A16, A18, A20 are aspherical coefficients.

IH: Image height

y=(x ² /R)/[1+{1-(k+1)(x ² /R ² )} ^1/2 ]+A4x ⁴ +A6x ⁶ +A8x ⁸ +A10x ¹⁰ +A12x ¹² +A14x ¹⁴ +A16x ¹⁶ +A18x ¹⁸ +A20x ²⁰ (1)

For convenience, the aspheric surface of each lens surface uses the aspheric surface shown in the above formula (1). However, the present invention is not limited to the aspheric polynomial form represented by the formula (1).

Table 3 and Table 4 show the design data of the inflection point and stagnation point of each lens in the imaging optical lens 10 of the first embodiment of the present invention. Among them, P1R1 and P1R2 represent the object side and image side of the first lens L1 respectively, P2R1 and P2R2 represent the object side and image side of the second lens L2 respectively, and P3R1 and P3R2 represent the object side and image side of the third lens L3 respectively. P4R1, P4R2 represent the object side and image side of the fourth lens L4, P5R1, P5R2 represent the object side and image side of the fifth lens L5, P6R1, P6R2 represent the object side and image side of the sixth lens L6, P7R1 P7R2 represents the object side and image side of the seventh lens L7, respectively, and P8R1 and P8R2 represent the object side and the image side of the eighth lens L8, respectively. The corresponding data in the “reflection point position” column is the vertical distance from the reflex point set on the surface of each lens to the optical axis of the imaging optical lens 10. The data corresponding to the “stationary point position” column is the vertical distance from the stationary point set on the surface of each lens to the optical axis of the imaging optical lens 10.

【table 3】

To	Number of recurve points	Recurve point position 1	Recurve point position 2	Recurve point position 3
P1R1	1	1.485	To	To
P1R2	2	1.435	1.695	To
P2R1	2	1.045	1.395	To
P2R2	3	0.535	1.105	1.355
P3R1	1	1.295	To	To
P3R2	2	0.785	1.135	To
P4R1	1	0.535	To	To
P4R2	0	To	To	To
P5R1	1	0.425	To	To
P5R2	3	0.745	1.375	1.875
P6R1	0	To	To	To
P6R2	1	0.935	To	To
P7R1	1	1.345	To	To
P7R2	2	1.155	4.195	To
P8R1	2	0.565	3.495	To
P8R2	1	1.065	To	To

【Table 4】

To	Number of stationary points	Stagnation position 1
P1R1	1	1.875
P1R2	0	To
P2R1	0	To
P2R2	1	1.465
P3R1	0	To
P3R2	0	To
P4R1	1	0.925
P4R2	0	To
P5R1	1	0.775
P5R2	0	To
P6R1	0	To
P6R2	1	1.645
P7R1	1	2.425

P7R2	1	2.095
P8R1	1	1.015
P8R2	1	3.005

2 and 3 respectively show schematic diagrams of axial aberration and chromatic aberration of magnification after light having wavelengths of 656 nm, 587 nm, 546 nm, 486 nm, and 436 nm pass through the imaging optical lens 10 of the first embodiment. Fig. 4 shows a schematic diagram of field curvature and distortion of light with a wavelength of 546 nm after passing through the imaging optical lens 10 of the first embodiment. The field curvature S in Fig. 4 is the field curvature in the sagittal direction, and T is the field curvature in the meridional direction. song.

The following Table 13 shows the values corresponding to the various values in each of Examples 1, 2, and 3 and the parameters that have been specified in the conditional expressions.

As shown in Table 13, the first embodiment satisfies various conditional expressions.

In this embodiment, the entrance pupil diameter of the imaging optical lens is 5.161mm, the full-field image height is 6.000mm, and the diagonal viewing angle is 69.88°, wide-angle, ultra-thin, and its axis and axis The external chromatic aberration is fully corrected and has excellent optical characteristics.

(Second embodiment)

The second embodiment is basically the same as the first embodiment, and the meaning of the symbols is the same as that of the first embodiment, and only the differences are listed below.

Table 5 and Table 6 show design data of the imaging optical lens 20 according to the second embodiment of the present invention.

【table 5】

Table 6 shows the aspheric surface data of each lens in the imaging optical lens 20 according to the second embodiment of the present invention.

【Table 6】

Table 7 and Table 8 show the design data of the inflection point and stagnation point of each lens in the imaging optical lens 20 according to the second embodiment of the present invention.

【Table 7】

To	Number of recurve points	Recurve point position 1	Recurve point position 2	Recurve point position 3
P1R1	3	1.075	2.065	2.205
P1R2	3	0.965	1.385	1.995
P2R1	2	1.125	1.975	To
P2R2	2	1.105	1.765	To
P3R1	0	To	To	To
P3R2	1	0.775	To	To
P4R1	1	0.405	To	To
P4R2	1	1.055	To	To
P5R1	1	0.415	To	To
P5R2	2	0.545	0.975	To
P6R1	2	0.175	0.585	To
P6R2	1	0.125	To	To

P7R1	0	To	To	To
P7R2	0	To	To	To
P8R1	2	0.355	3.465	To
P8R2	1	0.975	To	To

【Table 8】

To	Number of stationary points	Stagnation position 1	Stagnation position 2
P1R1	1	1.765	To
P1R2	0	To	To
P2R1	1	1.615	To
P2R2	2	1.735	1.785
P3R1	0	To	To
P3R2	1	1.095	To
P4R1	1	0.685	To
P4R2	0	To	To
P5R1	1	0.745	To
P5R2	0	To	To
P6R1	2	0.295	0.725
P6R2	1	0.205	To
P7R1	0	To	To
P7R2	0	To	To
P8R1	1	0.615	To
P8R2	1	1.915	To

6 and 7 respectively show schematic diagrams of axial aberration and chromatic aberration of magnification after light having wavelengths of 656 nm, 587 nm, 546 nm, 486 nm, and 436 nm pass through the imaging optical lens 20 of the second embodiment. FIG. 8 shows a schematic diagram of field curvature and distortion after light with a wavelength of 546 nm passes through the imaging optical lens 20 of the second embodiment.

As shown in Table 13, the second embodiment satisfies various conditional expressions.

In this embodiment, the entrance pupil diameter of the imaging optical lens is 5.161mm, the full-field image height is 6.000mm, and the diagonal viewing angle is 69.40°, wide-angle, ultra-thin, and its axis and axis The external chromatic aberration is fully corrected and has excellent optical characteristics.

(Third embodiment)

The third embodiment is basically the same as the first embodiment, and the meaning of the symbols is the same as that of the first embodiment, and only the differences are listed below.

Table 9 and Table 10 show design data of the imaging optical lens 30 according to the third embodiment of the present invention.

【Table 9】

Table 10 shows the aspheric surface data of each lens in the imaging optical lens 30 according to the third embodiment of the present invention.

【Table 10】

Table 11 and Table 12 show the design data of the inflection point and stagnation point of each lens in the imaging optical lens 30 of the third embodiment of the present invention.

【Table 11】

To	Number of recurve points	Recurve point position 1	Recurve point position 2	Recurve point position 3
P1R1	2	1.085	2.035	To
P1R2	3	1.035	1.455	2.035
P2R1	2	1.125	2.005	To
P2R2	1	1.155	To	To
P3R1	0	To	To	To
P3R2	1	0.765	To	To
P4R1	1	0.325	To	To
P4R2	1	1.045	To	To
P5R1	1	1.065	To	To
P5R2	0	To	To	To
P6R1	0	To	To	To
P6R2	1	0.485	To	To
P7R1	0	To	To	To
P7R2	0	To	To	To
P8R1	1	0.625	To	To
P8R2	1	1.075	To	To

【Table 12】

To	Number of stationary points	Stagnation position 1
P1R1	1	1.755
P1R2	0	To
P2R1	1	1.635
P2R2	0	To
P3R1	0	To
P3R2	1	1.055
P4R1	1	0.575
P4R2	0	To
P5R1	0	To
P5R2	0	To
P6R1	0	To
P6R2	1	0.805
P7R1	0	To
P7R2	0	To
P8R1	1	1.125
P8R2	1	2.205

10 and 11 respectively show schematic diagrams of axial aberration and chromatic aberration of magnification after light with wavelengths of 656 nm, 587 nm, 546 nm, 486 nm, and 436 nm passes through the imaging optical lens 30 of the third embodiment. FIG. 12 shows a schematic diagram of field curvature and distortion after light with a wavelength of 546 nm passes through the imaging optical lens 30 of the third embodiment.

The following Table 13 lists the numerical values corresponding to each conditional expression in this embodiment according to the above-mentioned conditional expressions. Obviously, the imaging optical system of this embodiment satisfies the above-mentioned conditional expressions.

In this embodiment, the entrance pupil diameter of the imaging optical lens is 5.008mm, the full-field image height is 6.000mm, the diagonal field angle is 71.00°, wide-angle, ultra-thin, and its axis and axis The external chromatic aberration is fully corrected and has excellent optical characteristics.

【Table 13】

Parameters and conditions	Example 1	Example 2	Example 3
f2/f	3.02	6.00	7.99
n6	1.57	1.62	1.67
(R9+R10)/(R9-R10)	2.50	6.75	10.98
f	8.000	8.000	7.763
f1	19.862	20.440	21.145
f2	24.160	48.000	62.029
f3	6.732	3.920	4.063
f4	-6.649	-5.583	-6.033
f5	-13.720	-41.290	-108.509
f6	9.718	-2483.159	-27.776
f7	168.421	-59.358	-74.840
f8	-9.456	-11.894	-15.588
f12	11.096	15.107	16.626
Fno	1.55	1.55	1.55

A person of ordinary skill in the art can understand that the above-mentioned embodiments are specific embodiments for realizing the present invention, and in practical applications, various changes can be made to them in form and details without departing from the spirit and spirit of the present invention. range.

Claims (10)

1. An imaging optical lens, characterized in that, from the object side to the image side, the imaging optical lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens in order from the object side to the image side. The seventh lens, and the eighth lens;

   The focal length of the imaging optical lens is f, the focal length of the first lens is f1, the focal length of the second lens is f2, the refractive index of the sixth lens is n6, and the curvature of the object side of the fifth lens The radius is R9, and the radius of curvature of the image side surface of the fifth lens is R10, which satisfies the following relationship:

   f1≥0;

   3.00≤f2/f≤8.00;

   1.55≤n6≤1.70;

   2.50≤(R9+R10)/(R9-R10)≤11.00.
2. The imaging optical lens of claim 1, wherein the focal length of the fifth lens is f5, and the following relationship is satisfied:

   -14.00≤f5/f≤-1.70.
3. The imaging optical lens of claim 1, wherein the curvature radius of the object side surface of the first lens is R1, the curvature radius of the image side surface of the first lens is R2, and the on-axis thickness of the first lens Is d1, the total optical length of the camera optical lens is TTL, and satisfies the following relationship:

   1.24≤f1/f≤4.09;

   -7.11≤(R1+R2)/(R1-R2)≤-2.25;

   0.02≤d1/TTL≤0.05.
4. The imaging optical lens of claim 1, wherein the curvature radius of the object side surface of the second lens is R3, the curvature radius of the image side surface of the second lens is R4, and the on-axis thickness of the second lens Is d3, the total optical length of the camera optical lens is TTL and satisfies the following relationship:

   0.25≤(R3+R4)/(R3-R4)≤33.61;

   0.02≤d3/TTL≤0.12.
5. The imaging optical lens of claim 1, wherein the focal length of the third lens is f3, the radius of curvature of the object side of the third lens is R5, and the radius of curvature of the image side of the third lens is R6. , The axial thickness of the third lens is d5, the total optical length of the imaging optical lens is TTL, and the following relationship is satisfied:

   0.25≤f3/f≤1.26;

   -1.79≤(R5+R6)/(R5-R6)≤-0.50;

   0.02≤d5/TTL≤0.11.
6. The imaging optical lens of claim 1, wherein the focal length of the fourth lens is f4, the radius of curvature of the object side of the fourth lens is R7, and the radius of curvature of the image side of the fourth lens is R8. , The axial thickness of the fourth lens is d7, the total optical length of the imaging optical lens is TTL, and the following relationship is satisfied:

   -1.66≤f4/f≤-0.47;

   0.15≤(R7+R8)/(R7-R8)≤1.16;

   0.02≤d7/TTL≤0.05.
7. The imaging optical lens of claim 1, wherein the focal length of the sixth lens is f6, the radius of curvature of the object side of the sixth lens is R11, and the radius of curvature of the image side of the sixth lens is R12 , The on-axis thickness of the sixth lens is d11, the total optical length of the imaging optical lens is TTL, and the following relationship is satisfied:

   -620.79≤f6/f≤1.82;

   -23.44≤(R11+R12)/(R11-R12)≤0.02;

   0.05≤d11/TTL≤0.15.
8. The imaging optical lens of claim 1, wherein the focal length of the seventh lens is f7, the radius of curvature of the object side of the seventh lens is R13, and the radius of curvature of the image side of the seventh lens is R14 , The axial thickness of the seventh lens is d13, the total optical length of the imaging optical lens is TTL, and the following relationship is satisfied:

   -19.28≤f7/f≤31.58;

   -104.51≤(R13+R14)/(R13-R14)≤-1.73;

   0.05≤d13/TTL≤0.15.
9. The imaging optical lens of claim 1, wherein the focal length of the eighth lens is f8, the radius of curvature of the object side of the eighth lens is R15, and the radius of curvature of the image side of the eighth lens is R16. , The axial thickness of the eighth lens is d15, the total optical length of the imaging optical lens is TTL, and the following relationship is satisfied:

   -4.02≤f8/f≤-0.79;

   0.73≤(R15+R16)/(R15-R16)≤4.08;

   0.03≤d15/TTL≤0.15.
10. The imaging optical lens of claim 1, wherein the combined focal length of the first lens and the second lens is f12, and the following relationship is satisfied:

    0.69≤f12/f≤3.21.

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