WO2021128380A1 - Optical camera lens - Google Patents

Abstract

Disclosed is an optical camera lens (10, 20, 30), which relates to the field of optical lenses. 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), wherein the focal length of the optical camera lens (10, 20, 30) is f, the focal length of the first lens (L1) is f1, the focal length of the second lens (L2) is f2, the radius of curvature of an object-side surface of the first lens (L1) is R1, the radius of curvature of an image-side surface of the first lens (L1) is R2, the axial thickness of the first lens (L1) is d1, the axial distance from the image-side surface of the first lens (L1) to an object-side surface of the second lens (L2) is d2, and the following relational expressions are satisfied: f1 ≥ 0.00 mm; 1.60 ≤ f2/f ≤ 3.50; 3.00 ≤ d1/d2 ≤ 30.00; and -0.90 ≤ (R1+R2)/(R1-R2) ≤-0.20. The optical camera lens (10, 20, 30) has a good optical performance and meets the design 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). -Oxide Semiconductor Sensor, CMOS Sensor), and due to the advancement 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 The miniaturized camera lens with good 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, Ultra-thin design requirements.

Summary of the invention

In view of the above-mentioned problems, the object of the present invention is to provide an imaging optical lens, which has good optical performance and meets the design requirements of large aperture and ultra-thinness.

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 radius of curvature of the object side surface of the first lens is R1, and the first lens image side The radius of curvature of is R2, the on-axis thickness of the first lens is d1, the on-axis distance from the image side of the first lens to the object side of the second lens is d2, and the following relationship is satisfied: f1≥ 0.00mm; 1.60≤f2/f≤3.50; 3.00≤d1/d2≤30.00; -0.90≤(R1+R2)/(R1-R2)≤-0.20.

Preferably, the radius of curvature of the object side surface of the eighth lens is R15, and the radius of curvature of the image side surface of the eighth lens is R16, and the following relationship is satisfied: 0.30≤(R15+R16)/(R15-R16)≤0.75 .

Preferably, the total optical length of the imaging optical lens is TTL, and satisfies the following relationship: 0.37≤f1/f≤1.33; 0.05≤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, the axial thickness of the second lens is d3, and the total optical length of the imaging optical lens is TTL, And satisfy the following relational expression: 0.63≤(R3+R4)/(R3-R4)≤3.90; 0.03≤d3/TTL≤0.14.

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: -2.63≤f3/f≤-0.61; -0.54≤(R5+R6)/(R5-R6)≤3.49; 0.02≤d5/TTL ≤0.06.

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: -34.91≤f4/f≤15.45; -2.27≤(R7+R8)/(R7-R8)≤5.11; 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: 0.75≤f5/f≤4.31; -4.52≤(R9+R10)/(R9-R10)≤-0.89; 0.02≤d9/TTL≤ 0.07.

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: -2.44≤f6/f≤-0.69; -4.41≤(R11+R12)/(R11-R12)≤-0.56; 0.02≤d11/ TTL≤0.07.

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≤1.48; -3.61≤(R13+R14)/(R13-R14)≤-0.90; 0.05≤d13/TTL≤ 0.19.

Preferably, the focal length of the eighth lens is f8, the on-axis thickness of the eighth lens is d15, the total optical length of the imaging optical lens is TTL, and the following relationship is satisfied: -1.70≤f8/f≤- 0.49; 0.03≤d15/TTL≤0.13.

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

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 L1 has positive refractive power, the second lens L2 has positive refractive power, the third lens L3 has negative refractive power, the fifth lens L5 has positive refractive power, the sixth lens L6 has negative refractive power, and the seventh lens L7 has Positive refractive power, and the eighth lens L8 has negative refractive power.

In this embodiment, the focal length of the first lens L1 is defined as f1, which satisfies the following relationship: f1≥0.00mm, which stipulates the positive and negative of the focal length of the first lens, and the reasonable distribution of the focal length makes the system have better Image quality. Preferably, f1≥2.51mm 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, which satisfies the following relationship: 1.60≤f2/f≤3.50, which specifies the ratio of the focal length of the second lens to the total focal length of the system, which can be effective Correct aberrations to improve image quality. Preferably, 1.63≤f2/f≤3.45 is satisfied.

The on-axis thickness of the first lens L1 is defined as d1, and the on-axis distance from the image side surface of the first lens L1 to the object side surface of the second lens L2 is d2, which satisfies the following relationship: 3.00≤d1/d2 ≤30.00, which specifies the ratio of the thickness of the first lens to the air gap between the first and second lenses, which helps to compress the total length of the optical system within the scope of the conditional formula and realize the ultra-thinness effect. Preferably, 3.03≤d1/d2≤29.91 is satisfied.

Define the curvature radius of the object side surface of the first lens L1 as R1, and the curvature radius of the image side surface of the first lens L1 as R2, which satisfies the following relationship: -0.90≤(R1+R2)/(R1-R2)≤- 0.20, specifies the first lens surface type, which can effectively balance the spherical aberration and field curvature of the system within the range of conditions.

Define the radius of curvature of the object side surface of the eighth lens L8 as R15, and the radius of curvature of the image side surface of the eighth lens L8 as R16, satisfying the following relationship: 0.30≤(R15+R16)/(R15-R16)≤0.75, The shape of the eighth lens is specified, and within the range specified by the conditional formula, the degree of deflection of the light passing through the lens can be eased, and aberrations can be effectively reduced. Preferably, 0.32≤(R15+R16)/(R15-R16)≤0.73 is satisfied.

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: 0.37≤f1/f≤1.33, which specifies the ratio of the focal length of the first lens L1 to the overall focal length. Within the specified range, the first lens 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, 0.60≤f1/f≤1.07 is satisfied.

The axial thickness of the first lens L1 is d1, and the total optical length of the imaging optical lens 10 is TTL, which satisfies the following relationship: 0.05≤d1/TTL≤0.18. Within the range of the conditional expression, it is beneficial to realize ultra-thinness . Preferably, 0.07≤d1/TTL≤0.15 is satisfied.

Define the curvature radius of the object side surface of the second lens L2 as R3, and the curvature radius of the image side surface of the second lens L2 as R4, which satisfies the following relationship: 0.63≤(R3+R4)/(R3-R4)≤3.90, The shape of the second lens L2 is specified. When the lens 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, 1.00≤(R3+R4)/(R3-R4)≤3.12 is satisfied.

The on-axis thickness of the second lens L2 is d3, and the total optical length of the imaging optical lens 10 is TTL, which satisfies the following relationship: 0.03≤d3/TTL≤0.14. Within the range of the conditional expression, it is beneficial to achieve ultra-thinness . Preferably, 0.05≤d3/TTL≤0.11 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: -2.63≤f3/f≤-0.61. The reasonable distribution of optical power makes the system better High imaging quality and low sensitivity. Preferably, it satisfies -1.64≤f3/f≤-0.76.

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: -0.54≤(R5+R6)/(R5-R6)≤3.49, The shape of the third lens is specified, and within the range specified by the conditional formula, the degree of deflection of the light passing through the lens can be alleviated, and aberrations can be effectively reduced. Preferably, -0.33≤(R5+R6)/(R5-R6)≤2.79 is satisfied.

The axial thickness of the third lens L3 is d5, and the total optical length of the imaging optical lens 10 is TTL, which satisfies the following relationship: 0.02≤d5/TTL≤0.06. Within the range of the conditional expression, it is beneficial to achieve ultra-thinness . Preferably, 0.03≤d5/TTL≤0.04 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: -34.91≤f4/f≤15.45, which specifies the ratio of the focal length of the fourth lens to the focal length of the system. The range of the formula helps to improve the performance of the optical system. Preferably, it satisfies -21.82≤f4/f≤12.36.

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: -2.27≤(R7+R8)/(R7-R8)≤5.11, specified It 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 helpful to correct the aberration of the off-axis angle of view. Preferably, -1.42≤(R7+R8)/(R7-R8)≤4.09 is satisfied.

The axial thickness of the fourth lens L4 is d7, and the total optical length of the imaging optical lens 10 is TTL, which satisfies the following relationship: 0.02≤d7/TTL≤0.07. Within the range of the conditional expression, it is beneficial to achieve ultra-thinness . Preferably, 0.03≤d7/TTL≤0.06 is satisfied.

The focal length of the overall imaging optical lens 10 is defined as f, and the focal length of the fifth lens L5 is f5, which satisfies the following relationship: 0.75≤f5/f≤4.31. The limitation on the fifth lens L5 can effectively make the imaging lens The light angle is gentle, reducing tolerance sensitivity. Preferably, 1.20≤f5/f≤3.45 is satisfied.

The curvature radius of the object side surface of the fifth lens L5 is R9, and the curvature radius of the image side surface of the fifth lens L5 is R10, which satisfies the following relationship: -4.52≤(R9+R10)/(R9-R10)≤-0.89 , The shape of the fifth lens L5 is specified. When the condition 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, -2.82≤(R9+R10)/(R9-R10)≤-1.12 is satisfied.

The axial thickness of the fifth lens L5 is d9, and the total optical length of the imaging optical lens 10 is TTL, which satisfies the following relationship: 0.02≤d9/TTL≤0.07. Within the range of the conditional expression, it is beneficial to achieve ultra-thinness . Preferably, 0.04≤d9/TTL≤0.06 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: -2.44≤f6/f≤-0.69. The reasonable distribution of optical power makes the system better High imaging quality and low sensitivity. Preferably, -1.53≤f6/f≤-0.86 is satisfied.

The radius of curvature of the object side surface of the sixth lens L6 is R11, and the radius of curvature of the image side surface of the sixth lens L6 is R12, and the following relationship is satisfied: -4.41≤(R11+R12)/(R11-R12)≤ -0.56, the shape of the sixth lens L6 is specified. When the condition 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, it satisfies -2.75≤(R11+R12)/(R11-R12)≤-0.70.

The axial thickness of the sixth lens L6 is d11, and the total optical length of the imaging optical lens 10 is TTL, which satisfies the following relationship: 0.02≤d11/TTL≤0.07. Within the range of the conditional expression, it 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≤1.48. Through the reasonable distribution of optical power, the system has better imaging Quality and low sensitivity. Preferably, 0.74≤f7/f≤1.18 is satisfied.

The curvature radius of the object side surface of the seventh lens L7 is R13, and the curvature radius of the image side surface of the seventh lens L7 is R14, which satisfies the following relationship: -3.61≤(R13+R14)/(R13-R14)≤-0.90 , The shape of the seventh lens L7 is stipulated. When the condition 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, it satisfies -2.26≤(R13+R14)/(R13-R14)≤-1.12.

The axial thickness of the seventh lens L7 is d13, and the total optical length of the imaging optical lens 10 is TTL, which satisfies the following relationship: 0.05≤d13/TTL≤0.19. Within the range of the conditional expression, it is beneficial to achieve ultra-thinness . Preferably, 0.09≤d13/TTL≤0.15 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: -1.70≤f8/f≤-0.49. The reasonable distribution of the optical power makes the system better High imaging quality and low sensitivity. Preferably, it satisfies -1.06≤f8/f≤-0.61.

The axial thickness of the eighth lens L8 is d15, and the total optical length of the imaging optical lens 10 is TTL, which satisfies the following relationship: 0.03≤d15/TTL≤0.13. Within the range of the conditional formula, it is beneficial to achieve ultra-thinness . Preferably, 0.05≤d15/TTL≤0.10 is satisfied.

In this embodiment, the image height of the overall imaging optical lens 10 is IH, and the total optical length of the imaging optical lens 10 is TTL, and the following conditional formula is satisfied: TTL/IH≤1.40, thereby achieving ultra-thinness.

In this embodiment, the aperture Fno of the imaging optical lens 10 is less than or equal to 1.75. Large aperture, good imaging performance.

In this embodiment, the FOV of the imaging optical lens 10 is greater than or equal to 80°, thereby achieving a wide angle.

When the above relationship is satisfied, the imaging optical lens 10 can meet the design requirements of large aperture, wide-angle, and ultra-thin design while having good optical performance. According to the characteristics of the optical lens 10, the optical lens 10 is particularly suitable for high-end cameras. Mobile phone camera lens assembly and WEB camera lens composed of CCD, CMOS and other imaging elements for pixels.

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;

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, 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	1.305	To	To
P1R2	0	To	To	To
P2R1	1	0.525	To	To
P2R2	3	0.345	1.245	1.865
P3R1	2	0.955	1.715	To
P3R2	0	To	To	To
P4R1	1	1.655	To	To
P4R2	1	1.745	To	To
P5R1	2	0.475	1.925	To
P5R2	2	0.305	2.015	To
P6R1	3	1.525	2.265	2.495
P6R2	2	1.805	2.615	To
P7R1	2	1.175	3.115	To
P7R2	2	1.485	3.955	To
P8R1	1	2.735	To	To
P8R2	2	0.825	4.545	To

【Table 4】

To	Number of stationary points	Stagnation position 1	Stagnation position 2
P1R1	0	To	To
P1R2	0	To	To
P2R1	1	0.795	To
P2R2	2	0.665	1.715
P3R1	0	To	To
P3R2	0	To	To
P4R1	1	1.845	To
P4R2	1	1.945	To
P5R1	1	0.805	To
P5R2	2	0.515	2.205
P6R1	0	To	To
P6R2	2	2.545	2.675
P7R1	1	2.125	To
P7R2	1	2.295	To
P8R1	0	To	To
P8R2	1	1.855	To

2 and 3 respectively show schematic diagrams of axial aberration and chromatic aberration of magnification after light having wavelengths of 656 nm, 588 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 various values in each of Examples 1, 2, 3, and 4 and the parameters specified in the conditional expression.

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 3.892mm, the full-field image height is 6.00mm, 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.

(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】

【Table 8】

To	Number of stationary points	Stagnation position 1	Stagnation position 2
P1R1	0	To	To
P1R2	0	To	To
P2R1	1	0.875	To
P2R2	1	1.955	To
P3R1	1	1.895	To
P3R2	0	To	To
P4R1	0	To	To
P4R2	1	1.925	To
P5R1	1	0.825	To
P5R2	2	0.555	2.165
P6R1	0	To	To
P6R2	1	0.315	To
P7R1	1	1.975	To
P7R2	1	1.835	To
P8R1	0	To	To
P8R2	1	1.735	To

6 and 7 respectively show schematic diagrams of axial aberration and chromatic aberration of magnification after light with wavelengths of 656 nm, 588 nm, 546 nm, 486 nm, and 436 nm passes 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 3.889mm, the full-field image height is 6.00mm, 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.

(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	Recurve point position 4
P1R1	1	1.315	To	To	To
P1R2	1	1.525	To	To	To
P2R1	2	0.325	1.865	To	To
P2R2	2	0.325	0.945	To	To
P3R1	4	0.945	1.425	1.615	1.785
P3R2	0	To	To	To	To
P4R1	2	1.485	1.745	To	To
P4R2	2	0.135	1.595	To	To
P5R1	2	0.485	1.945	To	To
P5R2	2	0.255	2.035	To	To
P6R1	3	1.535	2.245	2.465	To
P6R2	2	1.775	2.525	To	To
P7R1	2	1.095	3.085	To	To
P7R2	2	1.225	3.825	To	To
P8R1	2	2.675	4.005	To	To
P8R2	3	0.805	4.435	4.865	To

【Table 12】

To	Number of stationary points	Stagnation position 1	Stagnation position 2
P1R1	0	To	To
P1R2	1	1.935	To
P2R1	1	0.545	To
P2R2	2	0.615	1.225
P3R1	0	To	To
P3R2	0	To	To
P4R1	0	To	To
P4R2	2	0.235	1.915
P5R1	1	0.845	To
P5R2	2	0.435	2.205
P6R1	0	To	To
P6R2	2	2.345	2.715
P7R1	1	2.095	To
P7R2	1	1.965	To
P8R1	0	To	To
P8R2	1	1.785	To

10 and 11 respectively show schematic diagrams of axial aberration and chromatic aberration of magnification after light having wavelengths of 656 nm, 588 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 3.891mm, the full-field image height is 6.00mm, 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
f2/f	3.40	1.67	3.10
d1/d2	24.30	3.06	29.82
(R1+R2)/(R1-R2)	-0.90	-0.221	-0.63
f	6.732	6.728	6.732
f1	5.99	5.02	5.55
f2	22.906	11.227	20.887
f3	-8.839	-6.171	-7.316
f4	69.348	-20.005	-117.523
f5	19.333	10.820	10.082
f6	-8.222	-8.072	-6.954
f7	6.459	6.210	6.630
f8	-5.733	-4.924	-5.652
f12	4.917	3.798	4.568
Fno	1.73	1.73	1.73

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 (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 radius of curvature of the object side surface of the first lens is R1, and the first lens image side The radius of curvature of is R2, the on-axis thickness of the first lens is d1, the on-axis distance from the image side of the first lens to the object side of the second lens is d2, and the following relationship is satisfied:

   f1≥0.00mm;

   1.60≤f2/f≤3.50;

   3.00≤d1/d2≤30.00;

   -0.90≤(R1+R2)/(R1-R2)≤-0.20.
2. The imaging optical lens of claim 1, wherein 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 following relationship is satisfied:

   0.30≤(R15+R16)/(R15-R16)≤0.75.
3. The imaging optical lens of claim 1, wherein the total optical length of the imaging optical lens is TTL, and satisfies the following relationship:

   0.37≤f1/f≤1.33;

   0.05≤d1/TTL≤0.18.
4. The imaging optical lens of claim 1, wherein 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, 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:

   0.63≤(R3+R4)/(R3-R4)≤3.90;

   0.03≤d3/TTL≤0.14.
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:

   -2.63≤f3/f≤-0.61;

   -0.54≤(R5+R6)/(R5-R6)≤3.49;

   0.02≤d5/TTL≤0.06.
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:

   -34.91≤f4/f≤15.45;

   -2.27≤(R7+R8)/(R7-R8)≤5.11;

   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 , 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:

   0.75≤f5/f≤4.31;

   -4.52≤(R9+R10)/(R9-R10)≤-0.89;

   0.02≤d9/TTL≤0.07.
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 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:

   -2.44≤f6/f≤-0.69;

   -4.41≤(R11+R12)/(R11-R12)≤-0.56;

   0.02≤d11/TTL≤0.07.
9. 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≤1.48;

   -3.61≤(R13+R14)/(R13-R14)≤-0.90;

   0.05≤d13/TTL≤0.19.
10. The imaging optical lens of claim 1, wherein the focal length of the eighth lens is f8, the on-axis thickness of the eighth lens is d15, and the total optical length of the imaging optical lens is TTL, and satisfies The following relationship:

    -1.70≤f8/f≤-0.49;

    0.03≤d15/TTL≤0.13.

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