WO2021127820A1 - Camera optical lens - Google Patents

Abstract

A camera optical lens, relating to the field of optical lenses. The camera optical lens sequentially comprises from an object side to an image side: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens. The focal length of the camera 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 fifth lens is R9; the radius of curvature of the image-side surface of the fifth lens is R10; the on-axis thickness of the fourth lens is d7; the on-axis distance from the image-side surface of the fourth lens to the object-side surface of the fifth lens is d8; the following relations are satisfied: 0.78≤f1/f≤1.90, f2≤0, 0.10≤(R9+R10)/(R9-R10)≤0.85, and 4.00≤d7/d8≤20.00. The camera optical lens has good optical properties and also satisfies design requirements such as 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 fifth lens is R9, and the fifth lens image side The radius of curvature of is R10, the on-axis thickness of the fourth lens is d7, the on-axis distance from the image side of the fourth lens to the object side of the fifth lens is d8, and the following relationship is satisfied: 0.78≤ f1/f≤1.90; f2≤0; 0.10≤(R9+R10)/(R9-R10)≤0.85; 4.00≤d7/d8≤20.00.

Preferably, the focal length of the third lens is f3, and the following relationship is satisfied: 1.00≤f3/f≤7.00.

Preferably, 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, the axial thickness of the first lens is d1, and the total optical length of the imaging optical lens is TTL, and satisfies the following relationship: -11.83≤(R1+R2)/(R1-R2)≤-1.16; 0.03≤d1/TTL≤0.20.

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 relationship: -4.48≤f2/f≤-1.30; 0.94≤(R3+R4)/(R3-R4)≤10.31; 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, the axial thickness of the third lens is d5, and the total optical length of the imaging optical lens is TTL, and satisfies the following relationship: -14.82≤(R5+R6)/(R5-R6)≤-1.31; 0.02≤d5/TTL≤0.16.

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 total optical length of the imaging optical lens is TTL, And satisfy the following relational expressions: -10.40≤f4/f≤-2.31; -2.81≤(R7+R8)/(R7-R8)≤1.22; 0.02≤d7/TTL≤0.15.

Preferably, the focal length of the fifth lens is f5, 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: 1.88≤f5/f≤14.50; 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 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: 1.82≤f6/f≤27.93; 0.06≤(R11+R12)/(R11-R12)≤4.53; 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: -368.12≤f7/f≤7.85; -15.95≤(R13+R14)/(R13-R14)≤107.79; 0.03≤d13/TTL≤ 0.08.

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: -1.59≤f8/f≤-0.48; -2.38≤(R15+R16)/(R15-R16)≤-0.67; 0.03≤d15/ TTL≤0.09.

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;

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

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

FIG. 14 is a schematic diagram of axial aberration of the imaging optical lens shown in FIG. 13;

15 is a schematic diagram of the chromatic aberration of magnification of the imaging optical lens shown in FIG. 13;

FIG. 16 is a schematic diagram of field curvature and distortion of the imaging optical lens shown in FIG. 13.

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 negative refractive power, the third lens L3 has positive refractive power, the fourth lens L4 has negative refractive power, the fifth lens L5 has positive refractive power, and the sixth lens L6 has Positive refractive power, and the eighth lens L8 has negative refractive power.

In this embodiment, 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, which satisfies the following relationship: 0.78≤f1/f≤1.90, which specifies the focal length of the first lens and the total focal length The ratio of, within the range of conditions, helps reduce the total length of the system.

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, which helps correct system aberrations and improve imaging quality.

Define the radius of curvature of the object side surface of the fifth lens L5 as R9, and the radius of curvature of the image side surface of the fifth lens L5 as R10, satisfying the following relationship: 0.10≤(R9+R10)/(R9-R10)≤0.85, The shape of the fifth lens is specified, which helps to reduce the degree of light deflection and aberrations. Preferably, 0.11≤(R9+R10)/(R9-R10)≤0.83 is satisfied.

The on-axis thickness of the fourth lens L4 is defined as d7, and the on-axis distance from the image side surface of the fourth lens L4 to the object side surface of the fifth lens L5 is d8, which satisfies the following relationship: 4.00≤d7/d8 ≤20.00, when d7/d8 meet the conditions, it will help lens processing and lens assembly. Preferably, 4.21≤d7/d8≤19.64 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 relational expression: 1.00≤f3/f≤7.00, which specifies the ratio of the focal length of the third lens to the total focal length, in the conditional range The internal help to correct aberrations and improve the image quality of the image plane. Preferably, 1.02≤f3/f≤6.89 is satisfied.

Define the radius of curvature of the object side surface of the first lens L1 as R1, and the radius of curvature of the image side surface of the first lens L1 as R2, which satisfies the following relationship: -11.83≤(R1+R2)/(R1-R2)≤- 1.16. 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 -7.39≤(R1+R2)/(R1-R2)≤-1.45.

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: 0.03≤d1/TTL≤0.20. Within the range of the conditional expression, it is beneficial to achieve ultra-thinness . Preferably, 0.05≤d1/TTL≤0.16 is satisfied.

The focal length of the overall imaging optical lens 10 is defined as f, and the focal length of the second lens L2 is f2, which satisfies the following relationship: -4.48≤f2/f≤-1.30, and the negative refractive power of the second lens L2 is controlled at A reasonable range is conducive to correcting the aberration of the optical system. Preferably, it satisfies -2.80≤f2/f≤-1.63.

The curvature radius of the object side surface of the second lens L2 is R3, and the curvature radius of the image side surface of the second lens L2 is R4, which satisfies the following relationship: 0.94≤(R3+R4)/(R3-R4)≤10.31, which is specified When the shape of the second lens L2 is within the range, as the lens becomes ultra-thin and wide-angle, it is beneficial to correct the problem of axial chromatic aberration. Preferably, 1.51≤(R3+R4)/(R3-R4)≤8.25 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: 0.02≤d3/TTL≤0.05. Within the range of the conditional formula, it is beneficial to realize ultra-thinness . Preferably, 0.03≤d3/TTL≤0.04 is satisfied.

It is defined that 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: -14.82≤(R5+R6)/(R5-R6)≤- 1.31, the shape of the third lens is specified. Within the specified range of the conditional formula, the degree of deflection of light passing through the lens can be eased, and aberrations can be effectively reduced. Preferably, -9.26≤(R5+R6)/(R5-R6)≤-1.64 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≤0.16. Within the range of the conditional expression, it is beneficial to realize ultra-thinness . Preferably, 0.03≤d5/TTL≤0.13 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: -10.40≤f4/f≤-2.31, which specifies the ratio of the focal length of the fourth lens to the focal length of the system. The range of the conditional expression helps to improve the performance of the optical system. Preferably, -6.50≤f4/f≤-2.89 is satisfied.

The curvature radius of the object side surface of the fourth lens L4 is R7, and the curvature radius of the image side surface of the fourth lens L4 is R8, which satisfies the following relationship: -2.81≤(R7+R8)/(R7-R8)≤1.22, which is 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 beneficial to correct the aberration of the off-axis angle of view. Preferably, it satisfies -1.76≤(R7+R8)/(R7-R8)≤0.98.

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≤0.15. Within the range of the conditional expression, it is beneficial to realize ultra-thinness . Preferably, 0.03≤d7/TTL≤0.12 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: 1.88≤f5/f≤14.50. The limitation on the fifth lens L5 can effectively make the imaging lens The light angle is gentle, reducing tolerance sensitivity. Preferably, 3.01≤f5/f≤11.60 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≤0.06. Within the range of the conditional expression, it is beneficial to achieve ultra-thinness . Preferably, 0.03≤d9/TTL≤0.05 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: 1.82≤f6/f≤27.93. Through the reasonable distribution of optical power, the system has better imaging Quality and low sensitivity. Preferably, 2.92≤f6/f≤22.34 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: 0.06≤(R11+R12)/(R11-R12)≤4.53 , 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, 0.09≤(R11+R12)/(R11-R12)≤3.62 is satisfied.

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: 0.03≤d11/TTL≤0.08. Within the range of the conditional formula, it is beneficial to achieve 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: -368.12≤f7/f≤7.85. Through the reasonable distribution of optical power, the system has better Image quality and lower sensitivity. Preferably, it satisfies -230.08≤f7/f≤6.28.

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: -15.95≤(R13+R14)/(R13-R14)≤107.79, The shape of the seventh lens L7 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, -9.97≤(R13+R14)/(R13-R14)≤86.23 is satisfied.

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: 0.03≤d13/TTL≤0.08. Within the range of the conditional formula, it is beneficial to realize ultra-thinness . Preferably, 0.04≤d13/TTL≤0.06 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: -1.59≤f8/f≤-0.48. The reasonable distribution of optical power makes the system better High imaging quality and low sensitivity. Preferably, -0.99≤f8/f≤-0.60 is satisfied.

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, which satisfies the following relationship: -2.38≤(R15+R16)/(R15-R16)≤ -0.67, which is specified This is the shape of the eighth lens L8. When the conditions are within the range, with the development of ultra-thin and wide-angle, it is conducive to correcting the aberration of the off-axis angle of view. Preferably, -1.49≤(R15+R16)/(R15-R16)≤-0.83 is satisfied.

The on-axis 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≤0.09. Within the range of the conditional formula, it is beneficial to achieve ultra-thinness . Preferably, 0.04≤d15/TTL≤0.07 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≤1.22, thereby achieving ultra-thinness.

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

In this embodiment, the FOV of the imaging optical lens 10 is greater than or equal to 83°, thereby realizing 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	2.255	To	To
P1R2	1	2.155	To	To
P2R1	1	2.205	To	To
P2R2	1	2.095	To	To
P3R1	1	2.125	To	To
P3R2	1	1.895	To	To
P4R1	0	To	To	To
P4R2	2	0.565	2.165	To
P5R1	3	0.465	1.865	2.145
P5R2	2	1.895	2.415	To
P6R1	2	0.645	2.655	To
P6R2	0	To	To	To
P7R1	2	0.795	3.175	To
P7R2	2	0.875	3.955	To
P8R1	1	2.495	To	To
P8R2	2	5.405	6.175	To

【Table 4】

To	Number of stationary points	Stagnation position 1
P1R1	0	To
P1R2	0	To
P2R1	0	To
P2R2	0	To
P3R1	0	To
P3R2	0	To
P4R1	0	To

P4R2	1	0.865
P5R1	1	0.485
P5R2	0	To
P6R1	0	To
P6R2	0	To
P7R1	1	2.105
P7R2	1	2.365
P8R1	1	5.525
P8R2	0	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 17 shows the values corresponding to the various numerical values in each of Examples 1, 2, 3, and 4 and the parameters specified in the conditional expressions.

As shown in Table 17, the first embodiment satisfies each conditional expression.

In this embodiment, the entrance pupil diameter of the imaging optical lens is 4.683mm, the full-field image height is 8.15mm, and the diagonal field angle is 83.00°, wide-angle, ultra-thin, and its axis The external chromatic aberration is fully corrected and has excellent optical characteristics.

(Second embodiment)

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

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

【table 5】

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

【Table 6】

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

【Table 7】

To	Number of recurve points	Recurve point position 1	Recurve point position 2	Recurve point position 3
P1R1	1	2.305	To	To
P1R2	0	To	To	To
P2R1	0	To	To	To
P2R2	0	To	To	To
P3R1	0	To	To	To
P3R2	2	1.055	1.195	To
P4R1	0	To	To	To
P4R2	1	2.125	To	To
P5R1	3	0.125	1.895	2.365
P5R2	2	1.895	2.545	To
P6R1	2	0.225	2.635	To
P6R2	0	To	To	To

P7R1	3	1.105	3.275	4.605
P7R2	3	1.255	4.015	4.805
P8R1	2	2.565	6.005	To
P8R2	2	5.285	6.255	To

【Table 8】

To	Number of stationary points	Stagnation position 1
P1R1	0	To
P1R2	0	To
P2R1	0	To
P2R2	0	To
P3R1	0	To
P3R2	0	To
P4R1	0	To
P4R2	0	To
P5R1	1	0.205
P5R2	1	2.405
P6R1	1	0.395
P6R2	0	To
P7R1	1	1.915
P7R2	1	2.125
P8R1	1	5.625
P8R2	0	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 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 17, the second embodiment satisfies various conditional expressions.

In this embodiment, the entrance pupil diameter of the imaging optical lens is 4.683mm, the full-field image height is 8.15mm, and the diagonal field angle is 83.00°, wide-angle, ultra-thin, and its axis The external chromatic aberration is fully corrected and has excellent optical characteristics.

(Third embodiment)

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

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

【Table 9】

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

【Table 10】

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

【Table 11】

To	Number of recurve points	Recurve point position 1	Recurve point position 2	Recurve point position 3
P1R1	1	2.225	To	To
P1R2	0	To	To	To

P2R1	0	To	To	To
P2R2	0	To	To	To
P3R1	0	To	To	To
P3R2	2	1.065	1.545	To
P4R1	0	To	To	To
P4R2	3	0.295	0.505	2.245
P5R1	3	0.585	2.065	2.465
P5R2	2	1.955	2.665	To
P6R1	3	0.595	2.735	3.065
P6R2	0	To	To	To
P7R1	3	0.855	3.115	4.685
P7R2	3	1.005	3.855	4.905
P8R1	2	2.385	6.065	To
P8R2	2	5.375	6.325	To

【Table 12】

To	Number of stationary points	Stagnation position 1
P1R1	0	To
P1R2	0	To
P2R1	0	To
P2R2	0	To
P3R1	0	To
P3R2	0	To
P4R1	0	To
P4R2	0	To
P5R1	1	0.845
P5R2	0	To
P6R1	1	0.885
P6R2	0	To
P7R1	1	1.405
P7R2	1	1.645
P8R1	1	5.595
P8R2	0	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 17 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 4.683mm, the full-field image height is 8.15mm, and the diagonal field angle is 83.00°, wide-angle, ultra-thin, and its axis The external chromatic aberration is fully corrected and has excellent optical characteristics.

(Fourth embodiment)

The fourth 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 13 and Table 14 show design data of the imaging optical lens 40 according to the fourth embodiment of the present invention.

【Table 13】

Table 14 shows the aspheric surface data of each lens in the imaging optical lens 40 according to the fourth embodiment of the present invention.

【Table 14】

Table 15 and Table 16 show the inflection point and stagnation point design data of each lens in the imaging optical lens 40 according to the fourth embodiment of the present invention.

【Table 15】

To	Number of recurve points	Recurve point position 1	Recurve point position 2	Recurve point position 3
P1R1	1	2.255	To	To
P1R2	1	2.155	To	To
P2R1	1	2.205	To	To
P2R2	1	2.095	To	To
P3R1	1	2.125	To	To
P3R2	1	1.895	To	To
P4R1	0	To	To	To
P4R2	2	0.565	2.165	To
P5R1	3	0.465	1.865	2.145
P5R2	2	1.895	2.415	To
P6R1	2	0.645	2.655	To
P6R2	0	To	To	To
P7R1	2	0.795	3.175	To
P7R2	2	0.875	3.955	To
P8R1	1	2.495	To	To
P8R2	2	5.405	6.175	To

【Table 16】

To	Number of stationary points	Stagnation position 1
P1R1	0	To
P1R2	0	To
P2R1	0	To
P2R2	0	To
P3R1	0	To
P3R2	0	To
P4R1	0	To
P4R2	1	0.875
P5R1	1	0.725
P5R2	0	To
P6R1	1	0.985
P6R2	0	To
P7R1	1	1.315
P7R2	1	1.435
P8R1	1	5.745
P8R2	0	To

14 and 15 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 40 of the fourth embodiment. Fig. 16 shows a schematic diagram of field curvature and distortion after light having a wavelength of 546 nm passes through the imaging optical lens 40 of the fourth embodiment.

The following Table 17 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 4.683mm, the full-field image height is 8.15mm, and the diagonal viewing angle is 83.08°, wide-angle, ultra-thin, and its axis and axis The external chromatic aberration is fully corrected and has excellent optical characteristics.

【Table 17】

Parameters and conditions	Example 1	Example 2	Example 3	Example 4
f1/f	0.84	0.79	0.85	1.87
(R9+R10)/(R9-R10)	0.12	0.81	0.55	0.32
d7/d8	4.12	10.12	19.28	7.32
f	9.039	9.039	9.039	9.040
f1	7.569	7.116	7.673	16.856
f2	-19.207	-17.678	-20.252	-20.131
f3	61.198	57.540	27.770	9.486
f4	-34.223	-46.984	-31.375	-33.631
f5	37.711	87.379	33.997	37.740
f6	168.308	74.425	37.624	32.954
f7	22.199	25.195	-1663.734	47.325
f8	-7.181	-6.874	-6.463	-6.490
f12	11.010	10.451	10.937	60.967
Fno	1.93	1.93	1.93	1.93

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 fifth lens is R9, and the fifth lens image side The radius of curvature of is R10, the on-axis thickness of the fourth lens is d7, the on-axis distance from the image side of the fourth lens to the object side of the fifth lens is d8, and the following relationship is satisfied:

   0.78≤f1/f≤1.90;

   f2≤0;

   0.10≤(R9+R10)/(R9-R10)≤0.85;

   4.00≤d7/d8≤20.00.
2. The imaging optical lens of claim 1, wherein the focal length of the third lens is f3, and satisfies the following relationship:

   1.00≤f3/f≤7.00.
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 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:

   -11.83≤(R1+R2)/(R1-R2)≤-1.16;

   0.03≤d1/TTL≤0.20.
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:

   -4.48≤f2/f≤-1.30;

   0.94≤(R3+R4)/(R3-R4)≤10.31;

   0.02≤d3/TTL≤0.05.
5. The imaging optical lens of claim 1, wherein the curvature radius of the object side surface of the third lens is R5, the curvature radius of the image side surface 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:

   -14.82≤(R5+R6)/(R5-R6)≤-1.31;

   0.02≤d5/TTL≤0.16.
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 total optical length of the camera optical lens is TTL, and satisfies the following relationship:

   -10.40≤f4/f≤-2.31; -2.81≤(R7+R8)/(R7-R8)≤1.22;

   0.02≤d7/TTL≤0.15.
7. The imaging optical lens of claim 1, wherein the focal length of the fifth lens is f5, the axial thickness of the fifth lens is d9, and the total optical length of the imaging optical lens is TTL, and satisfies The following relationship:

   1.88≤f5/f≤14.50;

   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 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:

   1.82≤f6/f≤27.93; 0.06≤(R11+R12)/(R11-R12)≤4.53;

   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 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:

   -368.12≤f7/f≤7.85;

   -15.95≤(R13+R14)/(R13-R14)≤107.79;

   0.03≤d13/TTL≤0.08.
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. , 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:

    -1.59≤f8/f≤-0.48;

    -2.38≤(R15+R16)/(R15-R16)≤-0.67;

    0.03≤d15/TTL≤0.09.

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