WO2021127876A1 - Camera optical lens - Google Patents

Abstract

A camera optical lens (10). The camera optical lens (10) sequentially comprises 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) from an object side to an image side, and satisfies the following relationships: 0.85 ≤ f1/f ≤ 1.90, f2 ≤ 0, 1.00 ≤ (R13+R14)/(R13-R14) ≤ 8.00, and 2.70 ≤ d11/d12 ≤ 15.00. The camera optical lens (10) has good optical performance such as a large aperture and an ultrathin body.

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 in 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, five-chip, six-chip, seven-chip, and eight-chip The chip lens structure gradually appeared in lens design. There is an urgent need to provide a large aperture, ultra-thin optical camera lens with good optical performance.

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 large aperture and ultra-thin while achieving 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 on-axis curvature radius of the object side of the seventh lens is R13, and the seventh lens is The on-axis curvature radius of the mirror image side is R14, the on-axis thickness of the sixth lens is d11, and the on-axis distance from the image side of the sixth lens to the object side of the seventh lens is d12, which satisfies the following relationship :

0.85≤f1/f≤1.90;

f2≤0mm;

1.00≤(R13+R14)/(R13-R14)≤8.00;

2.70≤d11/d12≤15.00.

Preferably, the focal length of the third lens is f3, and satisfies the following relationship:

1.30≤f3/f≤3.00.

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, and the axial thickness of the first lens is d1, and the total optical length of the imaging optical lens It is TTL and satisfies the following relationship:

-10.06≤(R1+R2)/(R1-R2)≤-1.39;

0.03≤d1/TTL≤0.18.

Preferably, 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 axial thickness of the second lens is d3, and the total optical length of the imaging optical lens It is TTL and satisfies the following relationship:

-13.28≤f2/f≤-1.24;

1.97≤(R3+R4)/(R3-R4)≤26.36;

0.02≤d3/TTL≤0.05.

Preferably, the radius of curvature of the object side surface of the third lens is R5, the radius of curvature of the image side surface of the third lens is R6, and the axial thickness of the third lens is d5, and the total optical length of the imaging optical lens It is TTL and satisfies the following relationship:

-6.00≤(R5+R6)/(R5-R6)≤-1.07;

0.03≤d5/TTL≤0.22.

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:

-663.02≤f4/f≤-16.53;

0.92≤(R7+R8)/(R7-R8)≤96.33;

0.02≤d7/TTL≤0.07.

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:

-42.23≤f5/f≤3608.99;

-89.49≤(R9+R10)/(R9-R10)≤374.87;

0.02≤d9/TTL≤0.06.

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 total optical length of the imaging optical lens is TTL, And satisfy the following relationship:

1.04≤f6/f≤4.62;

-2.67≤(R11+R12)/(R11-R12)≤0.43;

0.03≤d11/TTL≤0.08.

Preferably, the focal length of the seventh lens is f7, 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:

-15.23≤f7/f≤-3.60;

0.04≤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:

-1.75≤f8/f≤-0.53;

-2.35≤(R15+R16)/(R15-R16)≤-0.65;

0.03≤d15/TTL≤0.08.

The beneficial effects of the present invention are: the imaging optical lens according to the present invention has excellent optical characteristics, meets the requirements of large aperture and ultra-thin, and is especially suitable for mobile phone camera lens components and camera components composed of high-pixel CCD, CMOS and other imaging elements. 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: 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.

Define the focal length of the overall imaging optical lens 10 as f, and the focal length of the first lens L1 as f1, which satisfies the following relationship: 0.85≤f1/f≤1.90. Within the range specified by the conditional formula, the first lens L1 has a positive The refractive power specifies the ratio of the focal length of the first lens to the total focal length, which helps to reduce the total length of the system within the range of conditions. Preferably, 0.86≤f1/f≤1.87 is satisfied.

The focal length of the second lens L2 is defined as f2, which satisfies the following relational expression: f2≤0, which specifies the focal length of the second lens. Within the range specified by the conditional expression, it is helpful to correct system aberrations and improve imaging quality.

Define 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, satisfying the following relationship: 1.00≤(R13+R14)/(R13-R14)≤8.00, which specifies the seventh The shape of the lens helps reduce the degree of light deflection and reduce aberrations. Preferably, 1.06≤(R13+R14)/(R13-R14)≤7.99 is satisfied.

The on-axis thickness of the sixth lens L 6 is defined as d11, and the on-axis distance from the image side surface of the sixth lens L 6 to the object side surface of the seventh lens L 7 is d12, which satisfies the following relationship: 2.70≤ d11/d12≤15, by specifying the ratio of the thickness of the sixth lens L6 to the air gap between the sixth and seventh lenses, it is helpful for lens processing and lens assembly within the scope of the conditional formula. It satisfies 2.72≤d11/d12≤14.87.

The focal length of the overall imaging optical lens 10 is defined as f, and the focal length of the third lens L3 is f3, which satisfies the following relationship: 1.30≤f3/f≤3.00. Within the scope of the conditional expression, the third lens L3 has a positive refraction Force, stipulates the ratio of the focal length of the third lens to the total focal length, which is helpful for aberration correction within the scope of the conditions, and improves the image quality of the image plane. Preferably, 1.34≤f3/f≤2.92.

When the focal length of the imaging optical lens 10 of the present invention, the focal length of each lens, the on-axis distance from the image side to the object side of the relevant lens, and the on-axis thickness satisfy the above relationship, the imaging optical lens 10 can be made to have high performance and satisfy Large aperture, ultra-thin design requirements.

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, -10.06≤(R1+R2)/(R1-R2)≤-1.39, which specifies the first When the shape of the lens L1 is within the range specified by the conditional expression, it is beneficial to reasonably control the shape of the first lens L1, so that the first lens L1 can effectively correct the spherical aberration of the system. Preferably, it satisfies -6.29≤(R1+R2)/(R1-R2)≤-1.73.

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 relational expression: 0.03≤d1/TTL≤0.18, which is beneficial to realize ultra-thinness within the specified range of the conditional expression. Preferably, 0.05≤d1/TTL≤0.14 is satisfied.

The focal length of the second lens L2 is f2, which satisfies a series of relational expressions: -13.28≤f2/f≤-1.24. Within the range of the conditional expression, the second lens L2 has a negative refractive power. The optical power is controlled in a reasonable range, which is beneficial to correct the aberration of the optical system. Preferably, it satisfies -8.30≤f2/f≤-1.55.

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, 1.97≤(R3+R4)/(R3-R4)≤26.36, which specifies the second lens L2 The shape of the lens can alleviate the degree of deflection of light passing through the lens and effectively reduce aberrations. Preferably, 3.15≤(R3+R4)/(R3-R4)≤21.08 is satisfied.

The on-axis thickness of the second lens L2 is d3, and the total optical length of the imaging optical lens is TTL, which satisfies the following relationship: 0.02≤d3/TTL≤0.05, which is beneficial to realize ultra-thinness. Preferably, 0.03≤d3/TTL≤0.04 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, -6.00≤(R5+R6)/(R5-R6)≤-1.07, which specifies the third The shape of the lens L3 can effectively control the shape of the third lens L3 and facilitate 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 relaxed, and aberrations can be effectively reduced. Preferably, it satisfies -3.75≤(R5+R6)/(R5-R6)≤-1.34.

The on-axis thickness of the third lens L3 is d5, and the total optical length of the imaging optical lens is TTL, which satisfies the following relationship: 0.03≤d5/TTL≤0.22. Within the specified range of the conditional formula, it is beneficial to realize ultra-thinness. Preferably, 0.05≤d5/TTL≤0.18 is satisfied.

The focal length of the fourth lens L4 is f4, which satisfies the series relationship: -663.02≤f4/f≤-16.53, which specifies the ratio of the focal length of the fourth lens L4 to the overall focal length. When in the specified range, the system has better imaging quality and lower sensitivity through reasonable distribution of optical power. Preferably, -414.39≤f4/f≤20.66 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, 0.92≤(R7+R8)/(R7-R8)≤96.33, which specifies the fourth lens L4 When the shape of is within the range of the conditional formula, with the development of ultra-thin and wide-angle, it is helpful to correct the aberration of the off-axis angle of view. Preferably, 1.47≤(R7+R8)/(R7-R8)≤77.07 is satisfied.

The axial thickness of the fourth lens L4 is d7, and the total optical length of the imaging optical lens is TTL, which satisfies the following relationship: 0.02≤d7/TTL≤0.07, which is beneficial to realize ultra-thinness. Preferably, 0.03≤d7/TTL≤0.05 is satisfied.

The focal length of the fifth lens L5 is f5, which satisfies the series relationship: -42.23≤f5/f≤3608.99, which specifies the ratio of the focal length of the fifth lens L5 to the overall focal length. When within the specified range, the light angle of the camera lens is smooth, and the tolerance sensitivity is reduced. Preferably, -26.39≤f5/f≤2887.19 is satisfied.

The radius of curvature of the object side surface of the fifth lens L5 is R9, and the radius of curvature of the image side surface of the fifth lens L5 is R10, -89.49≤(R9+R10)/(R9-R10)≤374.87, which specifies the fifth lens When the shape of L5 is within the range of the conditional expression, with the development of ultra-thin and wide-angle, it is beneficial to correct the aberration of the off-axis angle of view. Preferably, -55.93≤(R9+R10)/(R9-R10)≤299.89 is satisfied.

The axial thickness of the fifth lens L5 is d9, and the total optical length of the imaging optical lens is TTL, which satisfies the following relational expression: 0.02≤d9/TTL≤0.06. Within the range of the conditional expression, it is beneficial to realize ultra-thinness. Preferably, 0.03≤d9/TTL≤0.05 is satisfied.

The focal length of the sixth lens L6 is f6, which satisfies the series relationship: 1.04≤f6/f≤4.62, which specifies the ratio of the focal length of the sixth lens L6 to the overall focal length. Within the specified range, the system has better imaging quality and lower sensitivity. Preferably, 1.66≤f6/f≤3.69 is satisfied.

The curvature radius of the object side surface of the sixth lens L6 is R11, and the curvature radius of the image side surface of the sixth lens L6 is R12, -2.67≤(R11+R12)/(R11-R12)≤0.43, which specifies the sixth lens When the shape of L6 is within the range of the conditional expression, 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 -1.67≤(R11+R12)/(R11-R12)≤0.34.

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

The focal length of the seventh lens L7 is f7, which satisfies the series relationship: -15.23≤f7/f≤-3.60, which specifies the ratio of the focal length of the seventh lens L7 to the overall focal length. Within the specified range, the system has better imaging quality and lower sensitivity. Preferably, -9.52≤f7/f≤-4.49 is satisfied.

The on-axis thickness of the seventh lens L7 is d13, and the total optical length of the imaging optical lens is TTL, which satisfies the following relationship: 0.04≤d13/TTL≤0.15, which is beneficial to realize ultra-thinness. Preferably, 0.06≤d13/TTL≤0.12 is satisfied.

The focal length of the eighth lens L8 is f8, which satisfies the series relationship: -1.75≤f8/f≤-0.53, which specifies the ratio of the focal length of the eighth lens L8 to the overall focal length. When it is within the specified range, it is beneficial to reduce system aberrations, and at the same time, it is beneficial to the development of ultra-thin and wide-angle lenses. Preferably, it satisfies -1.09≤f8/f≤-0.66.

The curvature radius of the object side surface of the eighth lens L8 is R15, and the curvature radius of the image side surface of the eighth lens L8 is R16, -2.35≤(R15+R16)/(R15-R16)≤-0.65, which stipulates the eighth lens When the shape of the lens L8 is within the range of the conditional expression, 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 -1.47≤(R15+R16)/(R15-R16)≤-0.81.

The on-axis thickness of the eighth lens L8 is d15, and the total optical length of the imaging optical lens is TTL, which satisfies the following relationship: 0.03≤d15/TTL≤0.08, which is beneficial to realize ultra-thinness. Preferably, 0.04≤d15/TTL≤0.06 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: 0.70≤f12/f≤3.49. 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, 1.12≤f12/f≤2.79.

In this embodiment, the ratio TTL/IH of the total optical length TTL of the imaging optical lens 10 to the image height IH is less than or equal to 1.22, which is beneficial to achieve ultra-thinness.

In this embodiment, the aperture F number (Fno) of the imaging optical lens 10 is less than or equal to 1.95. Large aperture, good imaging performance.

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: 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 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;

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.

【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. P8R1 and P8R2 respectively represent the object side surface and the image side surface of the eighth lens L8. 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	Recurve point position 4
P1R1	1	2.295	To	To	To
P1R2	To	To	To	To	To
P2R1	To	To	To	To	To
P2R2	To	To	To	To	To
P3R1	To	To	To	To	To
P3R2	To	To	To	To	To

P4R1	1	0.135	To	To	To
P4R2	2	0.235	2.195	To	To
P5R1	2	0.435	2.425	To	To
P5R2	2	0.425	2.465	To	To
P6R1	3	0.945	2.865	3.345	To
P6R2	4	0.475	0.965	3.135	3.395
P7R1	2	0.945	4.005	To	To
P7R2	3	1.025	4.665	5.225	To
P8R1	2	2.765	6.085	To	To
P8R2	2	4.565	6.285	To	To

【Table 4】

To	Number of stationary points		Stagnation position 1	Stagnation position 2
P1R1	To	To	To
P1R2	To	To	To
P2R1	To	To	To
P2R2	To	To	To
P3R1	To	To	To
P3R2	To	To	To
P4R1	1	0.215	To
P4R2	1	0.395	To
P5R1	1	0.765	To
P5R2	1	0.745	To
P6R1	1	1.325	To
P6R2	To	To	To
P7R1	1	1.545	To
P7R2	1	1.825	To
P8R1	1	5.615	To
P8R2	To	To	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 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 4.666mm, the full-field image height is 8.15mm, the diagonal field angle is 83.00°, the aperture is large, wide-angle, and ultra-thin. On-axis and off-axis chromatic aberrations are fully corrected, and they have 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	Recurve point position 4
P1R1	1	2.275	To	To	To
P1R2	To	To	To	To	To
P2R1	To	To	To	To	To
P2R2	To	To	To	To	To
P3R1	To	To	To	To	To
P3R2	To	To	To	To	To
P4R1	1	0.195	To	To	To
P4R2	2	0.255	2.205	To	To
P5R1	2	0.485	2.415	To	To
P5R2	2	0.485	2.495	To	To
P6R1	2	0.805	2.905	To	To
P6R2	4	0.465	0.955	3.195	3.555
P7R1	2	0.805	3.535	To	To
P7R2	2	0.655	4.145	To	To
P8R1	2	2.785	6.005	To	To
P8R2	3	0.175	5.085	6.275	To

【Table 8】

To	Number of stationary points		Stagnation position 1
P1R1	To	To
P1R2	To	To
P2R1	To	To
P2R2	To	To
P3R1	To	To
P3R2	To	To
P4R1	1	0.335

P4R2	1	0.435
P5R1	1	0.865
P5R2	1	0.875
P6R1	1	1.285
P6R2	To	To
P7R1	1	1.085
P7R2	1	1.085
P8R1	1	5.425
P8R2	1	0.305

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 4.664mm, the full-field image height is 8.15mm, the diagonal field angle is 83.00°, the aperture is large, wide-angle, and ultra-thin. On-axis and off-axis chromatic aberrations are fully corrected, and they have 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
P1R1	1	2.245	To
P1R2	1	2.135	To
P2R1	1	2.115	To

P2R2	1	2.005	To
P3R1	1	2.165	To
P3R2	To	To	To
P4R1	1	0.335	To
P4R2	2	0.345	2.165
P5R1	2	0.535	2.485
P5R2	2	0.535	2.615
P6R1	2	0.825	3.065
P6R2	2	0.885	3.755
P7R1	2	0.685	3.595
P7R2	2	0.685	4.465
P8R1	2	2.755	5.785
P8R2	2	5.165	5.985

【Table 12】

To	Number of stationary points		Stagnation position 1	Stagnation position 2
P1R1	To	To	To
P1R2	To	To	To
P2R1	To	To	To
P2R2	To	To	To
P3R1	To	To	To
P3R2	To	To	To
P4R1	1	0.575	To
P4R2	1	0.595	To
P5R1	1	0.945	To
P5R2	1	0.955	To
P6R1	1	1.335	To
P6R2	1	1.265	To
P7R1	1	0.965	To
P7R2	1	1.175	To
P8R1	To	To	To
P8R2	To	To	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 436 nm pass 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 4.662mm, the full-field image height is 8.000mm, the diagonal viewing angle is 83.00°, the aperture is large, wide-angle, and ultra-thin. On-axis and off-axis chromatic aberrations are fully corrected, and they have excellent optical characteristics.

【Table 13】

Parameters and conditions	Example 1	Example 2	Example 3
f1/f	0.87	0.92	1.85
(R13+R14)/(R13-R14)	7.98	1.12	1.81
d11/d12	2.73	14.74	4.31
f	9.005	9.002	8.998
f1	7.867	8.252	16.618
f2	-16.785	-17.427	-59.752
f3	25.654	21.547	12.467
f4	-223.275	-321.913	-2982.942
f5	709.890	21658.736	-189.997
f6	24.371	18.655	27.691
f7	-67.546	-48.545	-68.532
f8	-7.860	-7.176	-7.144
f12	12.567	13.242	20.952
Fno	1.93	1.93	1.93

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 (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 on-axis curvature radius of the object side of the seventh lens is R13, and the seventh lens is The on-axis curvature radius of the mirror image side is R14, the on-axis thickness of the sixth lens is d11, and the on-axis distance from the image side of the sixth lens to the object side of the seventh lens is d12, which satisfies the following relationship :

   0.85≤f1/f≤1.90;

   f2≤0mm;

   1.00≤(R13+R14)/(R13-R14)≤8.00;

   2.70≤d11/d12≤15.00.
2. The imaging optical lens of claim 1, wherein the focal length of the third lens is f3, and satisfies the following relationship:

   1.30≤f3/f≤3.00.
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 axis of the first lens The thickness is d1, the total optical length of the camera optical lens is TTL, and the following relationship is satisfied:

   -10.06≤(R1+R2)/(R1-R2)≤-1.39;

   0.03≤d1/TTL≤0.18.
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 axis of the second lens The thickness is d3, the total optical length of the camera optical lens is TTL, and the following relationship is satisfied:

   -13.28≤f2/f≤-1.24;

   1.97≤(R3+R4)/(R3-R4)≤26.36;

   0.02≤d3/TTL≤0.05.
5. The imaging optical lens of claim 1, wherein 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 axis of the third lens is R5. The thickness is d5, the total optical length of the camera optical lens is TTL, and the following relationship is satisfied:

   -6.00≤(R5+R6)/(R5-R6)≤-1.07;

   0.03≤d5/TTL≤0.22.
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. , And 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:

   -663.02≤f4/f≤-16.53;

   0.92≤(R7+R8)/(R7-R8)≤96.33;

   0.02≤d7/TTL≤0.07.
7. 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 , And 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:

   -42.23≤f5/f≤3608.99;

   -89.49≤(R9+R10)/(R9-R10)≤374.87;

   0.02≤d9/TTL≤0.06.
8. 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 total optical length of the camera optical lens is TTL, and satisfies the following relationship:

   1.04≤f6/f≤4.62;

   -2.67≤(R11+R12)/(R11-R12)≤0.43;

   0.03≤d11/TTL≤0.08.
9. The imaging optical lens of claim 1, wherein the focal length of the seventh lens is f7, the axial thickness of the seventh lens is d13, the total optical length of the imaging optical lens is TTL, and Satisfy the following relations:

   -15.23≤f7/f≤-3.60;

   0.04≤d13/TTL≤0.15.
10. 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. , And 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:

    -1.75≤f8/f≤-0.53;

    -2.35≤(R15+R16)/(R15-R16)≤-0.65;

    0.03≤d15/TTL≤0.08.

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