WO2021114248A1 - Camera optical lens - Google Patents

Abstract

A camera optical lens (10), relating to the field of optical lenses. The camera optical lens (10) 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). The focal length of the camera optical lens (10) is f, the focal length of the first lens (L1) is f1, the focal length of the second lens (L2) is f2, the refractive index of the seventh lens (L7) is n7, and the following relations are satisfied: 3.50≤f1/f≤6.50, f2≤0, and 1.55≤n7≤1.70. The camera optical lens (10) has good optical properties such as a large aperture, a wide angle, 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). -OxideSemicondctor Sensor, CMOS Sensor), and due to the advancement of semiconductor manufacturing technology, the pixel size of photosensitive devices has been reduced, and nowadays electronic products are developed with good functions, light, thin and short appearance, so they have 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 often adopt three-element, four-element, or even five-element or six-element lens structures. However, with the development of technology and the increase in the diversified needs of users, the pixel area of the photosensitive device continues to shrink, and the system's requirements for image quality continue to increase, the eight-element lens structure gradually appears in the lens design, and it is common Although the eight-element lens has good optical performance, its optical power, lens spacing and lens shape settings are still unreasonable, resulting in the lens structure having good optical performance, but cannot meet the requirements of large aperture, Design requirements for ultra-thin and wide-angle.

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, the embodiments of the present invention provide 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 The refractive index of the seventh lens is n7 and satisfies the following relationship: 3.50≤f1/f≤6.50; f2≤0; 1.55≤n7≤1.70.

Preferably, the on-axis thickness of the third lens is d5, and the on-axis distance from the image side surface of the third lens to the object side surface of the fourth lens is d6, and the following relationship is satisfied: 1.50≤d5/d6≤4.00 .

Preferably, the focal length of the fifth lens is f5, and the focal length of the sixth lens is f6, and the following relationship is satisfied: 3.50≤f5/f6≤6.00.

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 satisfy the following relational expression: -36.07≤(R1+R2)/(R1-R2)≤-8.17; 0.02≤d1/TTL≤0.10.

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: -443.09≤f2/f≤-22.52; 18.63≤(R3+R4)/(R3-R4)≤141.75; 0.01≤d3/TTL≤0.04.

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: 0.50≤f3/f≤1.59; -0.41≤(R5+R6)/(R5-R6)≤-0.12; 0.05≤d5/TTL≤ 0.15.

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: -7.30≤f4/f≤-2.34; 1.62≤(R7+R8)/(R7-R8)≤5.02; 0.01≤d7/TTL≤ 0.05.

Preferably, the focal length of the fifth lens is f5, the radius of curvature of the object side of the fifth lens is R9, the radius of curvature of the image side of the fifth lens is R10, and the on-axis thickness of the fifth lens is d9 , The total optical length of the camera optical lens is TTL, and satisfies the following relationship: -28.44≤f5/f≤-7.69; 1.86≤(R9+R10)/(R9-R10)≤6.84; 0.02≤d9/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: -6.18≤f6/f≤-1.68; 2.04≤(R11+R12)/(R11-R12)≤7.94; 0.03≤d11/TTL≤ 0.08.

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 on-axis thickness of the seventh lens is d13 , The total optical length of the camera optical lens is TTL, and satisfies the following relationship: 0.46≤f7/f≤1.47; -3.72≤(R13+R14)/(R13-R14)≤-0.82; 0.04≤d13/TTL≤ 0.20.

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: -1.51≤f8/f≤-0.43; -0.94≤(R15+R16)/(R15-R16)≤-0.19; 0.04≤d15/ TTL≤0.22.

The beneficial effects of the present invention are: the imaging optical lens according to the present invention has good optical performance, and has the characteristics of large aperture, wide angle, and ultra-thinness, 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

In order to explain the technical solutions in the embodiments of the present invention more clearly, the following will briefly introduce the drawings needed in the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative work, other drawings can be obtained based on these drawings, among which:

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;

FIG. 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: an aperture S1, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens. 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 first lens has positive refractive power, the second lens has negative refractive power, the third lens has positive refractive power, the fourth lens has negative refractive power, and the fifth lens has negative refractive power, The sixth lens element has a negative refractive power, the seventh lens element has a positive refractive power, and the eighth lens element has a negative refractive power.

The focal length of the overall imaging optical lens 10 is defined as f, and the focal length of the first lens L1 is f1, 3.50≤f1/f≤6.50, which can effectively balance the spherical aberration and field curvature of the system.

The focal length of the second lens L2 is defined as f2, f2≤0; through the reasonable allocation of the optical focal length, the system has better imaging quality and lower sensitivity.

The refractive index of the seventh lens L7 is defined as n7, 1.55≤n7≤1.70, and the refractive index of the seventh lens is specified. In this range, it is more conducive to the development of ultra-thinness and at the same time conducive to correcting aberrations.

The on-axis thickness of the third lens L3 is d5, and the on-axis distance from the image side surface of the third lens L3 to the object side surface of the fourth lens L4 is d6, which satisfies 1.50≤d5/d6≤4.00, which stipulates the third The ratio of the thickness of the lens to the air gap between the third and the fourth lens helps to compress the total length of the optical system within the range of the conditional formula, and achieves an ultra-thinning effect.

The focal length of the fifth lens L5 is f5, and the focal length of the sixth lens L6 is f6, and the following relationship is satisfied: 3.50≦f5/f6≦6.00. The ratio of the focal length of the fifth and sixth lenses is specified, and the system has better imaging quality and lower sensitivity through the reasonable distribution of optical power.

The curvature radius R1 of the object side surface of the first lens L1 and the curvature radius R2 of the image side surface of the first lens L1 satisfy the following relationship: -36.07≤(R1+R2)/(R1-R2)≤-8.17, within the range of the conditional expression , Reasonably control the shape of the first lens so that the first lens can effectively correct the spherical aberration of the system. Preferably, it satisfies -22.54≤(R1+R2)/(R1-R2)≤-10.21.

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≤0.10. Within the range of the conditional formula, it is beneficial to realize ultra-thinness. Preferably, 0.03≤d1/TTL≤0.08 is satisfied.

Define the focal length of the overall imaging optical lens 10 as f, and the focal length of the second lens L2 as f2, satisfying the following relationship: -443.09≤f2/f≤-22.52, by controlling the negative power of the second lens L2 in a reasonable range , It is helpful to correct the aberration of the optical system. Preferably, -276.93≤f2/f≤-28.15 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, 18.63≤(R3+R4)/(R3-R4)≤141.75, which specifies the second lens L2 When the shape of the lens is within the range, as the lens develops towards ultra-thin and wide-angle, it is helpful to correct the problem of axial chromatic aberration. Preferably, it satisfies 29.81≤(R3+R4)/(R3-R4)≤113.40.

The on-axis thickness of the second lens L2 is d3, which satisfies the following relationship: 0.01≤d3/TTL≤0.04, which is beneficial to realize ultra-thinness. Preferably, 0.02≤d3/TTL≤0.03 is satisfied.

Define the focal length of the overall imaging optical lens 10 as f, and the focal length of the third lens L3 as f3, which satisfies the following relationship: 0.50≤f3/f≤1.59. Within the scope of the conditional formula, through the reasonable distribution of optical power, the system has Better imaging quality and lower sensitivity. Preferably, 0.80≤f3/f≤1.27 is satisfied.

The curvature radius R5 of the object side surface of the third lens L3 and the curvature radius R6 of the image side surface of the third lens L3 satisfy the following relationship: -0.41≤(R5+R6)/(R5-R6)≤-0.12, which specifies the third lens The shape of, within the range specified by the conditional formula, can ease the degree of deflection of light passing through the lens and effectively reduce aberrations. Preferably, -0.25≤(R5+R6)/(R5-R6)≤-0.15 is satisfied.

The on-axis thickness of the third lens L3 is d5, which satisfies the following relationship: 0.05≤d5/TTL≤0.15, which is beneficial to realize ultra-thinness. Preferably, 0.07≤d5/TTL≤0.12 is satisfied.

Define the focal length of the overall imaging optical lens 10 as f, and the focal length of the fourth lens L4 as f4, which satisfies the following relationship: -7.30≤f4/f≤-2.34, which specifies the ratio of the focal length of the fourth lens to the focal length of the system. The range helps to improve the performance of the optical system. Preferably, -4.56≤f4/f≤-2.92 is satisfied.

The curvature radius R7 of the object side surface of the fourth lens L4 and the curvature radius R8 of the image side surface of the fourth lens L4 satisfy the following relationship: 1.62≤(R7+R8)/(R7-R8)≤5.02, which is the fourth lens L4 When the shape is within the range, with the development of ultra-thin and wide-angle, it is helpful to correct the aberration of the off-axis angle of view. Preferably, 2.59≤(R7+R8)/(R7-R8)≤4.01 is satisfied.

The on-axis thickness of the fourth lens L4 is d7, which satisfies the following relationship: 0.01≤d7/TTL≤0.05, which is beneficial to realize ultra-thinness. Preferably, 0.02≤d7/TTL≤0.04 is satisfied.

Define the focal length of the overall imaging optical lens 10 as f, and the focal length of the fifth lens L5 as f5, which satisfies the following relationship: -28.44≤f5/f≤-7.69. The limitation on the fifth lens L5 can effectively make the imaging lens 10 The light angle is gentle, reducing tolerance sensitivity. Preferably, -17.77≤f5/f≤-9.62 is satisfied.

The curvature radius R9 of the object side surface of the fifth lens L5 and the curvature radius R10 of the image side surface of the fifth lens L5 satisfy the following relationship: 1.86≤(R9+R10)/(R9-R10)≤6.84, and the fifth lens L5 is specified When the shape is within the range of conditions, with the development of ultra-thin and wide-angle, it is helpful to correct the aberration of the off-axis angle of view. Preferably, 2.98≤(R9+R10)/(R9-R10)≤5.47 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, 0.02≤d9/TTL≤0.04 is satisfied.

Define the focal length of the overall imaging optical lens 10 as f, and the focal length of the sixth lens L6 as f6, which satisfies the following relationship: -6.18≤f6/f≤-1.68. Through the reasonable distribution of optical power, the system has better imaging Quality and low sensitivity. Preferably, it satisfies -3.86≤f6/f≤-2.10.

The curvature radius of the sixth lens L6 is R11, and the curvature radius of the sixth lens L6 is R12, which satisfies the following relationship: 2.04≤(R11+R12)/(R11-R12)≤7.94, which specifies the sixth lens When the shape of L6 is within the range, with the development of ultra-thin and wide-angle, it is helpful to correct the aberration of off-axis angle of view. Preferably, 3.27≤(R11+R12)/(R11-R12)≤6.35 is satisfied.

The on-axis thickness of the sixth lens L6 is d11, which satisfies the following relationship: 0.03≤d11/TTL≤0.08, which is beneficial to realize ultra-thinness. Preferably, 0.04≤d11/TTL≤0.06 is satisfied.

Define the focal length of the overall imaging optical lens 10 as f, and the focal length of the seventh lens L7 as f7, which satisfies the following relationship: 0.46≤f7/f≤1.47. Within the scope of the conditional formula, through the reasonable distribution of optical power, the system has Better imaging quality and lower sensitivity. Preferably, 0.73≤f7/f≤1.17 is satisfied.

The curvature radius of the object side surface of the seventh lens L7 is R13, the curvature radius of the image side surface of the seventh lens L7 is R14, -3.72≤(R13+R14)/(R13-R14)≤-0.82. When the shape of the seven 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, it satisfies -2.33≤(R13+R14)/(R13-R14)≤-1.02.

The on-axis thickness of the seventh lens L7 is d13, which satisfies the following relationship: 0.04≤d13/TTL≤0.20, which is beneficial to realize ultra-thinness. Preferably, 0.07≤d13/TTL≤0.16 is satisfied.

Define the focal length of the overall imaging optical lens 10 as f, and the focal length of the eighth lens L8 as f8, which satisfies the following relationship: -1.51≤f8/f≤-0.43. Within the scope of the conditional expression, through reasonable distribution of optical power, The system has better imaging quality and lower sensitivity. Preferably, -0.94≤f8/f≤-0.53 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: -0.94≤(R15+R16)/(R15-R16)≤-0.19, the eighth lens is specified When the shape of the lens L8 is within the range of conditions, with the development of ultra-thin and wide-angle, it is beneficial to correct the off-axis angle of view aberration and other problems. Preferably, it satisfies -0.59≤(R15+R16)/(R15-R16)≤-0.24.

The on-axis thickness of the eighth lens L8 is d15, which satisfies the following relationship: 0.04≤d15/TTL≤0.22, which is beneficial to realize ultra-thinness. Preferably, 0.06≤d15/TTL≤0.17 is satisfied.

In this embodiment, the image height of the overall imaging optical lens 10 is IH, which satisfies the following conditional formula: TTL/IH≤1.40, thereby facilitating the realization of ultra-thinness.

In this embodiment, the aperture F number Fno of the imaging optical lens 10 is less than or equal to 2.0. Large aperture, good imaging performance.

When the focal length of the imaging optical lens 10, the focal length of each lens, and the radius of curvature of the present invention satisfy the above-mentioned relationship, the imaging optical lens 10 can have good optical performance, and at the same time, it can meet the requirements of large aperture, wide-angle, and ultra-thinness. Design requirements; According to the characteristics of the optical lens 10, the optical lens 10 is particularly suitable for mobile phone camera lens components and WEB camera lenses composed of high-pixel CCD, CMOS and other imaging elements.

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 image side surface 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 eighth lens L8;

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;

nd7: 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 according to the first embodiment of the present invention.

【Table 2】

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	1.695	To	To
P1R2	1	1.515	To	To
P2R1	1	0.935	To	To
P2R2	1	1.675	To	To
P3R1	2	1.825	2.055	To
P3R2	0	To	To	To
P4R1	1	1.925	To	To
P4R2	1	2.005	To	To
P5R1	1	0.695	To	To
P5R2	2	0.845	2.355	To
P6R1	2	1.395	3.075	To
P6R2	3	0.945	3.535	3.585
P7R1	2	1.295	3.695	To
P7R2	1	1.235	To	To
P8R1	2	2.745	4.505	To
P8R2	1	1.015	To	To

【Table 4】

To	Number of stationary points	Stagnation position 1	Stagnation position 2
P1R1	0	To	To
P1R2	0	To	To
P2R1	1	1.915	To
P2R2	1	1.995	To
P3R1	0	To	To
P3R2	0	To	To
P4R1	1	2.225	To
P4R2	1	2.345	To
P5R1	1	1.035	To

P5R2	2	1.285	2.535
P6R1	1	2.165	To
P6R2	1	2.155	To
P7R1	1	2.295	To
P7R2	1	1.975	To
P8R1	0	To	To
P8R2	1	1.865	To

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 450 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 numerical values in each of Examples 1, 2, and 3 and the parameters 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 3.973mm, the full-field image height is 8.00mm, the diagonal field angle is 90.60°, 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 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	1	1.575	To	To
P1R2	1	1.705	To	To
P2R1	3	0.975	1.605	1.785
P2R2	2	1.805	1.965	To
P3R1	2	1.755	2.005	To
P3R2	0	To	To	To
P4R1	1	2.235	To	To
P4R2	1	2.145	To	To
P5R1	1	0.715	To	To
P5R2	2	0.835	2.315	To
P6R1	1	1.505	To	To
P6R2	2	1.015	3.475	To
P7R1	2	1.405	3.755	To
P7R2	1	1.285	To	To
P8R1	2	2.755	3.995	To
P8R2	1	1.055	To	To

【Table 8】

To	Number of stationary points	Stagnation position 1	Stagnation position 2
P1R1	0	To	To
P1R2	0	To	To
P2R1	0	To	To
P2R2	0	To	To
P3R1	0	To	To
P3R2	0	To	To
P4R1	0	To	To
P4R2	0	To	To
P5R1	1	1.065	To
P5R2	1	1.255	To
P6R1	1	2.305	To
P6R2	1	2.335	To
P7R1	2	2.465	4.085
P7R2	1	1.925	To
P8R1	0	To	To
P8R2	1	1.965	To

6 and 7 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 450 nm passes through the imaging optical lens 20 of the second embodiment. FIG. 8 shows a schematic diagram of field curvature and distortion of light with a wavelength of 546 nm after passing 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 3.795mm, the full-field image height is 7.30mm, the diagonal field angle is 87.60°, 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 of the third embodiment of the present invention.

【Table 10】

Table 11 and Table 12 show the inflection point and stagnation point design data 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	Recurve point position 4
P1R1	1	1.635	To	To	To

P1R2	1	1.735	To	To	To
P2R1	4	0.955	1.595	1.835	2.045
P2R2	1	1.815	To	To	To
P3R1	2	1.795	2.075	To	To
P3R2	0	To	To	To	To
P4R1	1	2.315	To	To	To
P4R2	1	2.325	To	To	To
P5R1	1	0.735	To	To	To
P5R2	2	0.835	2.245	To	To
P6R1	1	1.525	To	To	To
P6R2	1	1.095	To	To	To
P7R1	2	1.205	3.465	To	To
P7R2	1	1.495	To	To	To
P8R1	2	2.835	3.795	To	To
P8R2	1	0.865	To	To	To

【Table 12】

To	Number of stationary points	Stagnation position 1	Stagnation position 2
P1R1	0	To	To
P1R2	1	2.035	To
P2R1	1	1.965	To
P2R2	0	To	To
P3R1	0	To	To
P3R2	0	To	To
P4R1	0	To	To
P4R2	0	To	To
P5R1	1	1.095	To
P5R2	2	1.265	2.445
P6R1	1	2.315	To
P6R2	1	2.505	To
P7R1	2	2.175	3.865
P7R2	1	2.305	To
P8R1	0	To	To
P8R2	1	1.565	To

10 and 11 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 450 nm pass through the imaging optical lens 30 of the third embodiment. FIG. 12 shows a schematic diagram of field curvature and distortion of light with a wavelength of 546 nm after passing 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 4.033mm, the full-field image height is 6.80mm, the diagonal field angle is 80.00°, 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
f1/f	3.52	6.49	5.11
f2	-268.38	-469.71	-1742.25
n7	1.57	1.57	1.67
f	7.946	7.400	7.864
f1	27.980	48.047	40.199
f3	8.031	7.860	7.911
f4	-28.821	-27.009	-27.547
f5	-112.474	-105.217	-90.739
f6	-20.039	-22.848	-23.231
f7	7.617	6.797	7.694
f8	-5.738	-5.574	-5.029
f12	30.447	52.409	40.448
Fno	2.00	1.95	1.95

Among them, Fno is the aperture F number of the imaging optical lens.

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 (11)

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 seventh lens is n7, and the following relationship is satisfied:

   3.50≤f1/f≤6.50;

   f2≤0;

   1.55≤n7≤1.70.
2. The imaging optical lens of claim 1, wherein the on-axis thickness of the third lens is d5, and the on-axis distance from the image side surface of the third lens to the object side surface of the fourth lens is d6, and Satisfy the following relations:

   1.50≤d5/d6≤4.00.
3. The imaging optical lens of claim 1, wherein the focal length of the fifth lens is f5, and the focal length of the sixth lens is f6, and the following relationship is satisfied:

   3.50≤f5/f6≤6.00.
4. 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:

   -36.07≤(R1+R2)/(R1-R2)≤-8.17;

   0.02≤d1/TTL≤0.10.
5. The imaging optical lens according to 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:

   -443.09≤f2/f≤-22.52; 18.63≤(R3+R4)/(R3-R4)≤141.75;

   0.01≤d3/TTL≤0.04.
6. 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:

   0.50≤f3/f≤1.59; -0.41≤(R5+R6)/(R5-R6)≤-0.12;

   0.05≤d5/TTL≤0.15.
7. 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:

   -7.30≤f4/f≤-2.34; 1.62≤(R7+R8)/(R7-R8)≤5.02;

   0.01≤d7/TTL≤0.05.
8. The imaging optical lens of claim 1, wherein the focal length of the fifth lens is f5, the radius of curvature of the object side of the fifth lens is R9, and the radius of curvature of the image side of the fifth lens is R10 , The axial thickness of the fifth lens is d9, the total optical length of the imaging optical lens is TTL, and the following relationship is satisfied:

   -28.44≤f5/f≤-7.69; 1.86≤(R9+R10)/(R9-R10)≤6.84;

   0.02≤d9/TTL≤0.05.
9. 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:

   -6.18≤f6/f≤-1.68; 2.04≤(R11+R12)/(R11-R12)≤7.94;

   0.03≤d11/TTL≤0.08.
10. 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:

    0.46≤f7/f≤1.47; -3.72≤(R13+R14)/(R13-R14)≤-0.82;

    0.04≤d13/TTL≤0.20.
11. 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:

    -1.51≤f8/f≤-0.43;

    -0.94≤(R15+R16)/(R15-R16)≤-0.19;

    0.04≤d15/TTL≤0.22.

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