WO2021127868A1 - Camera optical lens - Google Patents

Abstract

A large-aperture wide-angle ultra-thin camera optical lens (10), sequentially comprising 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), which satisfy the following relations: 1.06≤f1/f≤1.90; f2≤0 mm; 7.00≤(R3+R4)/(R3-R4)≤38.00; 18.00≤d5/d6, wherein f, f1, and f2 are respectively the focal lengths of the camera optical lens (10), the first lens (L1), and the second lens (L2); R3 and R4 are respectively the radius of curvature of the object side surface and the image side surface of the second lens (L2); d5 is the on-axis thickness of the third lens (L3); d6 is the axial distance between the image side surface of the third lens (L3) and the object side surface of the fourth lens (L4).

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. In addition, with the development of technology and the increase in diversified needs of users, as the pixel area of the photosensitive device continues to shrink and the system's requirements for image quality continue to increase, an eight-element lens structure gradually appears in the lens design. There is an urgent need to provide a large aperture, wide-angle, and ultra-thin optical camera lens with good optical performance.

Summary of the invention

In view of the above-mentioned problems, the purpose of the present invention is to provide an imaging optical lens that can meet the requirements of large aperture, wide-angle, 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 radius of curvature of the object side surface of the second lens is R3, and the second lens image side The radius of curvature of is R4, the on-axis thickness of the third lens is d5, and the on-axis distance from the image side of the third lens to the object side of the fourth lens is d6, which satisfies the following relationship:

1.06≤f1/f≤1.90;

f2≤0mm;

7.00≤(R3+R4)/(R3-R4)≤38.00;

18.00≤d5/d6.

Preferably, the focal length of the sixth lens is f6, and satisfies the following relationship:

-7.00≤f6/f≤-4.00.

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:

-9.38≤(R1+R2)/(R1-R2)≤-1.40;

0.03≤d1/TTL≤0.13.

Preferably, the on-axis thickness of the second lens is d3, the total optical length of the imaging optical lens is TTL, and the following relationship is satisfied:

-66.36≤f2/f≤-2.99;

0.01≤d3/TTL≤0.05.

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

0.76≤f3/f≤4.49;

0.14≤(R5+R6)/(R5-R6)≤1.48;

0.03≤d5/TTL≤0.19.

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:

-8.54≤f4/f≤-1.67;

0.65≤(R7+R8)/(R7-R8)≤4.28;

0.01≤d7/TTL≤0.04.

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:

-1269.85≤f5/f≤226.10;

-0.40≤(R9+R10)/(R9-R10)≤203.26;

0.02≤d9/TTL≤0.07.

Preferably, the radius of curvature of the object side surface of the sixth lens is R11, the radius of curvature of the image side surface of the sixth lens is R12, the axial thickness of the sixth lens is d11, and the total optical length of the imaging optical lens is TTL, and satisfies the following relationship:

1.64≤(R11+R12)/(R11-R12)≤7.21;

0.02≤d11/TTL≤0.08.

Preferably, the focal length of the seventh lens is f7, the on-axis curvature radius of the object side of the seventh lens is R13, the on-axis curvature radius of the image side of the seventh lens is R14, and the axis of the seventh lens is R14. The upper thickness is d13, the total optical length of the camera optical lens is TTL, and the following relationship is satisfied:

0.56≤f7/f≤1.93;

-3.88≤(R13+R14)/(R13-R14)≤-1.23;

0.05≤d13/TTL≤0.14.

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:

-1.47≤f8/f≤-0.46;

-1.78≤(R15+R16)/(R15-R16)≤-0.34;

0.03≤d15/TTL≤0.11.

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

Description of the drawings

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

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

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

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

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

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

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

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

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

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

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

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

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;

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

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

18 is a schematic diagram of axial aberration of the imaging optical lens shown in FIG. 17;

19 is a schematic diagram of the chromatic aberration of magnification of the imaging optical lens shown in FIG. 17;

20 is a schematic diagram of field curvature and distortion of the imaging optical lens shown in FIG. 17.

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 seven 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 focal length of the overall imaging optical lens 10 is defined as f, the focal length of the first lens L1 is f1, and the following relationship is satisfied: 1.06≤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 of the system, which can effectively balance the spherical aberration and field curvature of the system. Preferably, 1.06≤f1/f≤1.88 is satisfied.

The focal length of the second lens L2 is defined as f2, which satisfies the following relational expression: f2≤0mm, which specifies the positive and negative of the focal length of the second lens. Through the reasonable allocation of focal lengths, the system has better imaging quality and lower sensitivity. Sex. Preferably, f2≤-18.62mm.

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, 7.00≤(R3+R4)/(R3-R4)≤38.00, which specifies the second lens The shape of L2 can ease the deflection of light passing through the lens and effectively reduce aberrations. Preferably, it satisfies 7.07≤(R3+R4)/(R3-R4)≤37.99.

The on-axis thickness of the third lens L3 is defined as d5, and the on-axis distance from the image side surface of the third lens L3 to the object side surface of the fourth lens L4 is d6, which satisfies the following relationship: 18.00≤d5/d6 , The ratio of the thickness of the third lens to the air space between the third and fourth lenses is specified, which helps to compress the total length of the optical system within the scope of the conditional formula, and achieves an ultra-thin effect. Satisfy 18.47≤d5/d6.

The focal length of the sixth lens L6 is f6, which satisfies a series of relational expressions: -7.00≤f6/f≤-4.00. When within a specified range, the sixth lens L6 has a negative refractive power. The ratio of the focal length of the sixth lens L6 to the overall focal length is specified, so that the system has better imaging quality and lower sensitivity. Preferably, -6.92≤f6/f≤-4.04 is satisfied.

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, wide-angle, 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, -9.38≤(R1+R2)/(R1-R2)≤-1.40, which stipulates 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 -5.86≤(R1+R2)/(R1-R2)≤-1.75.

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≤0.13, which is beneficial to realize ultra-thinness within the specified range of the conditional expression. Preferably, 0.05≤d1/TTL≤0.11 is satisfied.

The focal length of the second lens L2 is f2, which satisfies a series of relational expressions: -66.36≤f2/f≤-2.99. 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, -41.47≤f2/f≤-3.73 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: 0.01≤d3/TTL≤0.05, which is beneficial to realize ultra-thinness. Preferably, 0.02≤d3/TTL≤0.04 is satisfied.

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: 0.76≤f3/f≤4.49. 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, 1.22≤f3/f≤3.59.

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, 0.14≤(R5+R6)/(R5-R6)≤1.48, which specifies the third lens L3 The shape of the third lens L3 can effectively control the shape of the third lens L3, which is conducive to the molding of the third lens L3. Within the specified range of the conditional formula, the degree of deflection of the light passing through the lens can be reduced, and aberrations can be effectively reduced. Preferably, it satisfies 0.23≤(R5+R6)/(R5-R6)≤1.19.

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≤0.19. Within the specified range of the conditional formula, it is beneficial to realize ultra-thinness. Preferably, 0.05≤d5/TTL≤0.15 is satisfied.

The focal length of the fourth lens L4 is f4, which satisfies the series relationship: -8.54≤f4/f≤-1.67, which specifies the ratio of the focal length of the fourth lens L4 to the overall focal length. When within the specified range, the fourth lens L4 has negative refractive power, and the reasonable distribution of the optical power enables the system to have better imaging quality and lower sensitivity. Preferably, -5.34≤f4/f≤-2.09 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, 0.65≤(R7+R8)/(R7-R8)≤4.28, 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, 1.04≤(R7+R8)/(R7-R8)≤3.43 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: 0.01≤d7/TTL≤0.04, which is beneficial to realize ultra-thinness. Preferably, 0.01≤d7/TTL≤0.03 is satisfied.

The focal length of the fifth lens L5 is f5, which satisfies the series relationship: -169.85≤f5/f≤226.10. Within the range specified by the conditional formula, the ratio of the focal length of the fifth lens to the total focal length of the system is specified, and the focal length is reasonably allocated , So that the system has better imaging quality and lower sensitivity. Preferably, -793.65≤f5/f≤180.88 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, -0.40≤(R9+R10)/(R9-R10)≤203.26, 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 helpful to correct the aberration of the off-axis angle of view. Preferably, it satisfies -0.25≤(R9+R10)/(R9-R10)≤162.61.

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 relationship: 0.02≤d9/TTL≤0.07. Within the range of the conditional expression, it is beneficial to realize ultra-thinness. Preferably, 0.03≤d9/TTL≤0.05 is satisfied.

The sixth lens L6 has a negative refractive power, 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, 1.64≤(R11+R12)/(R11- R12)≤7.21, which specifies the shape of the sixth lens L6. When it is within the range of the conditional formula, with the development of ultra-thin and wide-angle, it is beneficial to correct the aberration of the off-axis angle of view. Preferably, 2.63≤(R11+R12)/(R11-R12)≤5.77 is satisfied.

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: 0.02≤d11/TTL≤0.08, which is beneficial to realize ultra-thinness. Preferably, 0.03≤d11/TTL≤0.06 is satisfied.

The focal length of the seventh lens L7 is f7, which satisfies the series relationship: 0.56≤f7/f≤1.93, which specifies the ratio of the focal length of the seventh lens L7 to the overall focal length. When within the specified range, the seventh lens L7 has a positive refractive power, so that the system has better imaging quality and lower sensitivity. Preferably, 0.90≤f7/f≤1.54 is satisfied.

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: -3.88≤(R13+R14)/(R13-R14)≤-1.23, which specifies The shape of the seventh lens helps reduce the degree of light deflection and aberrations. Preferably, -2.43≤(R13+R14)/(R13-R14)≤-1.54 is satisfied.

The axial 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: 0.05≤d13/TTL≤0.14, which is beneficial to realize ultra-thinness. Preferably, 0.07≤d13/TTL≤0.11 is satisfied.

The focal length of the eighth lens L8 is f8, which satisfies the series relationship: -1.47≤f8/f≤-0.46, which specifies the ratio of the focal length of the eighth lens L8 to the overall focal length. When within the specified range, the eighth lens L8 has a negative 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, -0.92≤f8/f≤-0.58 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, -1.78≤(R15+R16)/(R15-R16)≤-0.34, which specifies the eighth lens The shape of the lens, within the range specified by the conditional formula, can ease the degree of deflection of light passing through the lens and effectively reduce aberrations. Preferably, -1.11≤(R15+R16)/(R15-R16)≤-0.43 is satisfied.

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≤0.11, which is beneficial to achieve ultra-thinness. Preferably, 0.05≤d15/TTL≤0.09 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: 0.64≤f12/f≤2.86. 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, 1.03≤f12/f≤2.29.

In this embodiment, the total optical length TTL of the imaging optical lens 10 is less than or equal to 10.64 mm, which is beneficial to realize ultra-thinness. Preferably, the total optical length TTL is less than or equal to 10.15 mm.

In this embodiment, the aperture F number (Fno) of the imaging optical lens 10 is less than or equal to 2.01. Large aperture, good imaging performance. Preferably, the aperture F number is less than or equal to 1.97.

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 optical filter GF;

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

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

d17: the axial thickness of the optical filter GF;

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

nd: refractive index of d-line;

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

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

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

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

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

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

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

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

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

vd: Abbe number;

v1: Abbe number of the first lens L1;

v2: Abbe number of the second lens L2;

v3: Abbe number of the third lens L3;

v4: Abbe number of the fourth lens L4;

v5: Abbe number of the fifth lens L5;

v6: Abbe number of the sixth lens L6;

v7: Abbe number of the seventh lens L7;

V8: Abbe number of the eighth lens L8;

vg: Abbe number of optical filter GF.

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

【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
P1R1	To	To	To	To
P1R2	To	To	To	To
P2R1	To	To	To	To
P2R2	To	To	To	To
P3R1	2	0.865	1.465	To
P3R2	To	To	To	To
P4R1	1	0.585	To	To
P4R2	1	0.885	To	To

P5R1	To	To	To	To
P5R2	1	2.375	To	To
P6R1	2	1.525	3.155	To
P6R2	2	1.345	3.355	To
P7R1	1	1.305	To	To
P7R2	3	1.255	3.935	4.125
P8R1	1	2.935	To	To
P8R2	1	0.665	To	To

【Table 4】

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	0.845
P4R2	1	1.365
P5R1	To	To
P5R2	To	To
P6R1	1	2.225
P6R2	1	2.285
P7R1	1	2.395
P7R2	1	2.045
P8R1	To	To
P8R2	1	1.215

2 and 3 respectively show schematic diagrams of axial aberration and chromatic aberration of magnification after light having wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, and 470 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 555 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 meridian direction. song.

The following Table 21 shows the values corresponding to various values in each of Examples 1, 2, 3, 4, and 5 and the parameters that have been specified in the conditional expression.

As shown in Table 21, the first embodiment satisfies various conditional expressions.

In this embodiment, the entrance pupil diameter of the imaging optical lens is 4.135mm, the full-field image height is 8.00mm, the diagonal viewing angle is 88.20°, 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	To	To	To	To	To
P1R2	To	To	To	To	To
P2R1	1	1.925	To	To	To
P2R2	1	1.805	To	To	To
P3R1	3	0.545	1.495	1.925	To
P3R2	To	To	To	To	To
P4R1	1	0.605	To	To	To
P4R2	1	0.815	To	To	To
P5R1	To	To	To	To	To
P5R2	1	2.295	To	To	To
P6R1	2	1.265	3.095	To	To
P6R2	1	1.035	To	To	To
P7R1	3	1.215	3.685	3.845	To
P7R2	4	1.145	3.685	4.375	4.635
P8R1	1	2.915	To	To	To
P8R2	1	0.765	To	To	To

【Table 8】

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	2	0.925	1.705
P3R2	To	To	To
P4R1	1	0.915	To
P4R2	1	1.285	To
P5R1	To	To	To

P5R2	To	To	To
P6R1	1	1.885	To
P6R2	1	1.905	To
P7R1	1	2.225	To
P7R2	1	1.845	To
P8R1	To	To	To
P8R2	1	1.415	To

6 and 7 respectively show schematic diagrams of axial aberration and chromatic aberration of magnification after light with wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, and 470 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 555 nm passes through the imaging optical lens 20 of the second embodiment.

As shown in Table 21, the second embodiment satisfies various conditional expressions.

In this embodiment, the entrance pupil diameter of the imaging optical lens is 4.254mm, the full-field image height is 8.00mm, the diagonal field angle is 86.60°, 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	Recurve point position 3	Recurve point position 4
P1R1	To	To	To	To	To
P1R2	To	To	To	To	To
P2R1	1	1.955	To	To	To
P2R2	1	1.805	To	To	To

P3R1	3	0.125	1.485	1.915	To
P3R2	To	To	To	To	To
P4R1	1	0.575	To	To	To
P4R2	1	0.755	To	To	To
P5R1	1	0.045	To	To	To
P5R2	1	2.295	To	To	To
P6R1	2	1.125	3.035	To	To
P6R2	1	0.905	To	To	To
P7R1	3	1.175	3.655	3.835	To
P7R2	4	1.095	3.685	4.385	4.615
P8R1	1	2.885	To	To	To
P8R2	1	0.675	To	To	To

【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	2	0.205	1.755
P3R2	To	To	To
P4R1	1	0.905	To
P4R2	1	1.225	To
P5R1	1	0.065	To
P5R2	To	To	To
P6R1	1	1.725	To
P6R2	1	1.685	To
P7R1	1	2.135	To
P7R2	1	1.775	To
P8R1	To	To	To
P8R2	1	1.235	To

10 and 11 respectively show schematic diagrams of axial aberration and chromatic aberration of magnification after light having wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, and 470 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 555 nm passes through the imaging optical lens 30 of the third embodiment.

The following Table 21 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 4.277mm, the full-field image height is 8.00mm, the diagonal field angle is 86.20°, 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.

(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	Recurve point position 4
P1R1	To	To	To	To	To
P1R2	To	To	To	To	To
P2R1	1	1.955	To	To	To
P2R2	1	1.815	To	To	To
P3R1	3	0.605	1.505	1.885	To
P3R2	To	To	To	To	To
P4R1	1	0.565	To	To	To
P4R2	1	0.755	To	To	To
P5R1	1	0.075	To	To	To
P5R2	1	2.285	To	To	To
P6R1	2	1.095	3.015	To	To
P6R2	1	0.855	To	To	To
P7R1	3	1.175	3.645	3.845	To
P7R2	4	1.095	3.685	4.385	4.615
P8R1	1	2.875	To	To	To
P8R2	1	0.655	To	To	To

【Table 16】

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	2	1.045	1.715
P3R2	To	To	To
P4R1	1	0.895	To
P4R2	1	1.215	To
P5R1	1	0.125	To

P5R2	To	To	To
P6R1	1	1.675	To
P6R2	1	1.585	To
P7R1	1	2.125	To
P7R2	1	1.765	To
P8R1	To	To	To
P8R2	1	1.185	To

14 and 15 respectively show schematic diagrams of axial aberration and chromatic aberration of magnification after light having wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, and 470 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 with a wavelength of 555 nm passes through the imaging optical lens 40 of the fourth embodiment.

As shown in Table 21, the fourth embodiment satisfies various conditional expressions.

In this embodiment, the entrance pupil diameter of the imaging optical lens is 4.264mm, the full-field image height is 8.00mm, the diagonal field angle is 86.40°, 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.

(Fifth Embodiment)

The fifth 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 17 and Table 18 show design data of the imaging optical lens 50 according to the fifth embodiment of the present invention.

【Table 17】

Table 18 shows the aspheric surface data of each lens in the imaging optical lens 50 of the fifth embodiment of the present invention.

【Table 18】

Table 19 and Table 20 show the design data of the inflection point and stagnation point of each lens in the imaging optical lens 50 of the fifth embodiment of the present invention.

【Table 19】

To	Number of recurve points	Recurve point position 1	Recurve point position 2	Recurve point position 3	Recurve point position 4
P1R1	To	To	To	To	To
P1R2	2	1.915	2.025	To	To
P2R1	To	To	To	To	To
P2R2	1	1.855	To	To	To
P3R1	1	0.885	To	To	To
P3R2	To	To	To	To	To

P4R1	1	0.555	To	To	To
P4R2	1	0.815	To	To	To
P5R1	1	0.425	To	To	To
P5R2	2	0.465	2.305	To	To
P6R1	2	0.995	2.855	To	To
P6R2	1	0.695	To	To	To
P7R1	3	1.145	3.565	3.765	To
P7R2	4	1.125	3.725	4.365	4.755
P8R1	1	2.845	To	To	To
P8R2	2	0.375	5.845	To	To

【Table 20】

To	Number of stationary points		Stagnation position 1
P1R1	To	To
P1R2	To	To
P2R1	To	To
P2R2	To	To
P3R1	1	1.485
P3R2	To	To
P4R1	1	0.885
P4R2	1	1.305
P5R1	1	0.745
P5R2	1	0.775
P6R1	1	1.485
P6R2	1	1.275
P7R1	1	2.075
P7R2	1	1.835
P8R1	To	To
P8R2	1	0.655

18 and 19 respectively show schematic diagrams of axial aberration and chromatic aberration of magnification after light having wavelengths of 650 nm, 610 nm, 555 nm, 510 nm, and 470 nm pass through the imaging optical lens 50 of the fifth embodiment. FIG. 20 shows a schematic diagram of field curvature and distortion after light with a wavelength of 555 nm passes through the imaging optical lens 50 of the fifth embodiment.

As shown in Table 21, the fifth embodiment satisfies various conditional expressions.

In this embodiment, the entrance pupil diameter of the imaging optical lens is 4.229mm, the full-field image height is 8.00mm, the diagonal field angle is 86.99°, 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 21】

Parameters and conditions	Example 1	Example 2	Example 3	Example 4	Example 5
f1/f	1.85	1.16	1.07	1.08	1.08
(R3+R4)/(R3-R4)	37.99	9.94	7.30	7.14	8.39
d5/d6	46.54	129.80	33.85	18.95	20.95
f	8.063	8.295	8.340	8.314	8.247
f1	14.930	9.618	8.896	9.000	8.903
f2	-267.523	-50.518	-37.897	-37.238	-46.437
f3	12.269	20.587	24.976	23.346	22.990
f4	-20.209	-29.801	-35.607	-34.448	-28.524
f5	220.465	381.492	1257.128	817.343	-5236.218
f6	-34.648	-33.903	-51.139	-52.223	-56.382
f7	9.043	9.730	10.671	10.639	10.613
f8	-5.933	-6.068	-6.098	-6.019	-5.712
f12	15.367	11.369	11.009	11.222	10.629
Fno	1.95	1.95	1.95	1.95	1.95

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 second lens is R3, and the second lens image side The radius of curvature of is R4, the on-axis thickness of the third lens is d5, and the on-axis distance from the image side of the third lens to the object side of the fourth lens is d6, which satisfies the following relationship:

   1.06≤f1/f≤1.90;

   f2≤0mm;

   7.00≤(R3+R4)/(R3-R4)≤38.00;

   18.00≤d5/d6.
2. The imaging optical lens of claim 1, wherein the focal length of the sixth lens is f6, and satisfies the following relationship:

   -7.00≤f6/f≤-4.00.
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:

   -9.38≤(R1+R2)/(R1-R2)≤-1.40;

   0.03≤d1/TTL≤0.13.
4. The imaging optical lens of claim 1, wherein the on-axis thickness of the second lens is d3, and the total optical length of the imaging optical lens is TTL, and the following relationship is satisfied:

   -66.36≤f2/f≤-2.99;

   0.01≤d3/TTL≤0.05.
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 , And the total optical length of the camera optical lens is TTL, and satisfies the following relationship:

   0.76≤f3/f≤4.49;

   0.14≤(R5+R6)/(R5-R6)≤1.48;

   0.03≤d5/TTL≤0.19.
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:

   -8.54≤f4/f≤-1.67;

   0.65≤(R7+R8)/(R7-R8)≤4.28;

   0.01≤d7/TTL≤0.04.
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:

   -1269.85≤f5/f≤226.10;

   -0.40≤(R9+R10)/(R9-R10)≤203.26;

   0.02≤d9/TTL≤0.07.
8. The imaging optical lens of claim 1, wherein 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 R12. Is d11, the total optical length of the camera optical lens is TTL, and satisfies the following relationship:

   1.64≤(R11+R12)/(R11-R12)≤7.21;

   0.02≤d11/TTL≤0.08.
9. The imaging optical lens of claim 1, wherein the focal length of the seventh lens is f7, the on-axis curvature radius of the object side of the seventh lens is R13, and the seventh lens is on the axis of the image side The radius of curvature is R14, the on-axis thickness of the seventh lens is d13, the total optical length of the imaging optical lens is TTL, and the following relationship is satisfied:

   0.56≤f7/f≤1.93;

   -3.88≤(R13+R14)/(R13-R14)≤-1.23;

   0.05≤d13/TTL≤0.14.
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:

    -1.47≤f8/f≤-0.46;

    -1.78≤(R15+R16)/(R15-R16)≤-0.34;

    0.03≤d15/TTL≤0.11.

Images