CN108132522B - Camera optics - Google Patents

Abstract

The invention relates to the field of optical lenses, and discloses an imaging optical lens. The imaging optical lens comprises, in order from the object side to the image side: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a first lens Six lenses, and a seventh lens; and the following relations are satisfied: ‑10≤f1/f≤‑3.1; 1.7≤n7≤2.2; 1≤f6/f7≤10;‑10≤(R1+R2)/(R1‑ R2)≤10; 0.01≤d13/TTL≤0.2. The imaging optical lens can obtain low TTL while obtaining high imaging performance.

Description

Camera optics

technical field

The 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 is increasing day by day, and the photosensitive devices of general photographic lenses are nothing more than Charge Coupled Device (CCD) or Complementary Metal-Oxide Semiconductor (Complementary Metal-Oxide Semiconductor). Sensor, CMOS Sensor), and due to the improvement of semiconductor manufacturing process technology, the pixel size of the photosensitive device has been reduced, and the current electronic products have a trend of good functions, light, thin and short appearance, so they have good imaging quality. The miniaturized camera lens has become the mainstream in the current market. In order to obtain better image quality, the lenses traditionally mounted on mobile phone cameras mostly adopt a three-piece or four-piece lens structure. In addition, with the development of technology and the increase of diversified needs of users, the pixel area of the photosensitive device is continuously reduced, and the requirements of the system for imaging quality are constantly improving. Gradually appear in the lens design. There is an urgent need for a wide-angle camera lens with excellent optical characteristics, ultra-thin, and fully corrected chromatic aberration.

SUMMARY OF THE INVENTION

In view of the above problems, the purpose of the present invention is to provide an imaging optical lens, which can meet the requirements of ultra-thinning and wide-angle while obtaining high imaging performance.

In order to solve the above technical problems, embodiments of the present invention provide an imaging optical lens, the imaging optical lens, from the object side to the image side, sequentially includes: a first lens, a second lens, a third lens, and a fourth lens , the fifth lens, the sixth lens, and the seventh lens;

The focal length of the imaging optical lens is f, the focal length of the first lens is f1, the radius of curvature of the object side of the first lens is R1, the radius of curvature of the image side of the first lens is R2, and the seventh The refractive index of the lens is n7, the axial thickness of the seventh lens is d13, the focal length of the sixth lens is f6, the focal length of the seventh lens is f7, and the total optical length of the imaging optical lens is TTL, Satisfy the following relation:

-10≤f1/f≤-3.1;

1.7≤n7≤2.2;

1≤f6/f7≤10;

-10≤(R1+R2)/(R1-R2)≤10;

0.01≤d13/TTL≤0.2.

Compared with the prior art, the embodiment of the present invention utilizes the above-mentioned configuration of the lenses, and utilizes the cooperation of lenses with specific relationships in the data of focal length, refractive index, total optical length, on-axis thickness, and radius of curvature of the imaging optical lens. , so that the imaging optical lens can meet the requirements of ultra-thin and wide-angle while obtaining high imaging performance.

Preferably, the imaging optical lens satisfies the following relationship: -9.95≤f1/f≤-3.2; 1.706≤n7≤2.1; 1.71≤f6/f7≤9.95; -9.999≤(R1+R2)/(R1-R2 )≤9.49; 0.023≤d13/TTL≤0.163.

Preferably, the first lens has a negative refractive power; the on-axis thickness of the first lens is d1 and satisfies the following relationship: 0.1≤d1≤0.31.

Preferably, the imaging optical lens satisfies the following relationship: 0.17≤d1≤0.25.

Preferably, the second lens has a positive refractive power, its object side is convex on the paraxial axis, and its image side is convex on the paraxial axis; the focal length of the imaging optical lens is f, and the focal length of the second lens is f2 , the radius of curvature of the object side of the second lens is R3, the radius of curvature of the image side of the second lens is R4, the on-axis thickness of the second lens is d3, and the following relationship is satisfied: 0.42≤f2/f ≤1.39; -1.95≤(R3+R4)/(R3-R4)≤-0.24; 0.24≤d3≤0.84.

Preferably, the imaging optical lens satisfies the following relational expressions: 0.67≤f2/f≤1.11; -1.22≤(R3+R4)/(R3-R4)≤-0.3; 0.38≤d3≤0.67.

Preferably, the third lens has a negative refractive power, its object side is convex on the paraxial axis, and its image side is concave on the paraxial axis; the focal length of the imaging optical lens is f, and 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, the on-axis thickness of the third lens is d5, and the following relationship is satisfied: -22.58≤f3/ f≤-3.08; 3.21≤(R5+R6)/(R5-R6)≤22.85; 0.11≤d5≤0.37.

Preferably, the imaging optical lens satisfies the following relationship: -14.12≤f3/f≤-3.86; 5.13≤(R5+R6)/(R5-R6)≤18.28; 0.18≤d5≤0.3.

Preferably, the fourth lens has a negative refractive power, its object side is convex on the paraxial axis, and its image side is concave on the paraxial axis; the focal length of the imaging optical lens is f, and 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, the on-axis thickness of the fourth lens is d7, and the following relationship is satisfied: -9.92≤f4/ f≤-2.42; 1.39≤(R7+R8)/(R7-R8)≤5.63; 0.15≤d7≤0.68.

Preferably, the imaging optical lens satisfies the following relational expressions: -6.20≤f4/f≤-3.02; 2.23≤(R7+R8)/(R7-R8)≤4.51; 0.23≤d7≤0.55.

Preferably, the fifth lens has a positive refractive power, the object side is concave on the paraxial axis, and the image side is convex on the paraxial axis; the focal length of the imaging optical lens is f, and 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, the on-axis thickness of the fifth lens is d9, and the following relationship is satisfied: 0.19≤f5/f ≤0.76; 0.67≤(R9+R10)/(R9-R10)≤2.27; 0.41≤d9≤2.12.

Preferably, the imaging optical lens satisfies the following relational expressions: 0.31≤f5/f≤0.61; 1.06≤(R9+R10)/(R9-R10)≤1.82; 0.66≤d9≤1.69.

Preferably, the sixth lens has a negative refractive power, and its object side is concave on the paraxial axis; the focal length of the imaging optical lens is f, the focal length of the sixth lens is f6, and the object side of the sixth lens is concave; The radius of curvature is R11, the radius of curvature of the image side surface of the sixth lens is R12, the on-axis thickness of the sixth lens is d11, and the following relational expressions are satisfied: -10.66≤f6/f≤-1.0; -3.46≤( R11+R12)/(R11-R12)≤0.43; 0.13≤d11≤0.91.

Preferably, the imaging optical lens satisfies the following relationship: -6.67≤f6/f≤-1.25; -2.16≤(R11+R12)/(R11-R12)≤0.35; 0.21≤d11≤0.73.

Preferably, the seventh lens has a negative refractive power, the object side is convex on the paraxial axis, and the image side is concave on the paraxial axis; the focal length of the imaging optical lens is f, and 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, the on-axis thickness of the seventh lens is d13, and the following relationship is satisfied: 0.74≤(R13+ R14)/(R13-R14)≤2.74; -1.24≤f7/f≤-0.28; 0.1≤d13≤0.98.

Preferably, the imaging optical lens satisfies the following relational expressions: 1.19≤(R13+R14)/(R13-R14)≤2.19; -0.78≤f7/f≤-0.35; 0.16≤d13≤0.78.

Preferably, the total optical length TTL of the imaging optical lens is less than or equal to 6.08 mm.

Preferably, the total optical length TTL of the imaging optical lens is less than or equal to 5.8 mm.

Preferably, the aperture F number of the imaging optical lens is less than or equal to 2.27.

Preferably, the aperture F number of the imaging optical lens is less than or equal to 2.22.

The beneficial effects of the present invention are: the photographic optical lens according to the present invention has excellent optical properties, is ultra-thin, wide-angle, and fully compensates for chromatic aberration, and is especially suitable for mobile phone camera lenses composed of high-pixel CCD, CMOS and other photographic elements Components and WEB Camera Lenses.

Description of drawings

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

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

3 is a schematic diagram of the magnification chromatic aberration 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 structural diagram of an imaging optical lens according to a second embodiment of the present invention;

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

7 is a schematic diagram of the magnification chromatic aberration 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 structural diagram of an imaging optical lens according to a third embodiment of the present invention;

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

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

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

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, each embodiment of the present invention will be described in detail below with reference to the accompanying drawings. However, those of ordinary skill in the art can appreciate that, in the various embodiments of the present invention, many technical details are set forth 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 solutions claimed in the present invention can be realized.

(first embodiment)

Referring to the accompanying 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, and the imaging optical lens 10 includes seven lenses. Specifically, the imaging optical lens 10, from the object side to the image side, sequentially includes: an aperture S1, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens Lens L6 and seventh lens L7. Optical elements such as an optical filter GF may be provided between the seventh lens L7 and the image plane Si.

The first lens L1 is made of plastic material, the second lens L2 is made of plastic material, the third lens L3 is made of plastic material, the fourth lens L4 is made of plastic material, the fifth lens L5 is made of plastic material, the sixth lens L6 is made of plastic material, and the seventh lens L6 is made of plastic material. The lens L7 is made of glass.

The focal length of the overall imaging optical lens 10 is defined as f, the focal length of the first lens is f1, -10≤f1/f≤-3.1, and the negative refractive power of the first lens L1 is specified. When the upper limit value is exceeded, although it is beneficial to the development of ultra-thin lenses, the negative refractive power of the first lens L1 will be too strong, making it difficult to correct problems such as aberrations, and at the same time, it is not conducive to the development of the lens to wide-angle. Conversely, when the lower limit value is exceeded, the negative refractive power of the first lens becomes too weak, making it difficult for the lens to become ultra-thin. Preferably, -9.95≤f1/f≤-3.2 is satisfied.

The refractive index of the seventh lens is defined as n7, 1.7≤n7≤2.2, and the refractive index of the seventh lens L7 is specified. Within this range, it is more conducive to the development of ultra-thinning and correction of aberrations. Preferably, 1.706≤n7≤2.1 is satisfied.

The focal length of the sixth lens is defined as f6, the focal length of the seventh lens is f7, 1≤f6/f7≤10, and the ratio of the focal length f6 of the sixth lens L6 to the focal length f7 of the seventh lens L7 is defined, which can be Effectively reduce the sensitivity of the optical lens group for imaging, and further improve the image quality. Preferably, 1.71≤f6/f7≤9.95 is satisfied.

The radius of curvature of the object side of the first lens is defined as R1, the radius of curvature of the image side of the first lens is R2, -10≤(R1+R2)/(R1-R2)≤10, and the first lens L1 is defined When the shape is outside the range, it is difficult to correct problems such as aberration of the off-axis picture angle with the development of ultra-thin and wide-angle. Preferably, -9.999≤(R1+R2)/(R1-R2)≤9.49 is satisfied.

The on-axis thickness of the seventh lens is defined as d13, the total optical length of the imaging optical lens is TTL, 0.01≤d13/TTL≤0.2, and the axial thickness of the seventh lens L7 and the total optical length of the imaging optical lens 10 are defined The ratio of TTL is conducive to achieving ultra-thinning. Preferably, 0.023≤d13/TTL≤0.163 is satisfied.

When the focal length of the imaging optical lens 10 according to the present invention, the focal length of each lens, the refractive index of the relevant lens, the optical total length of the imaging optical lens, the thickness on the axis and the radius of curvature satisfy the above relational expressions, the imaging optical lens 10 can have a high performance, and meet the design requirements of low TTL.

In this embodiment, the first lens L1 has a negative refractive power.

The on-axis thickness of the first lens L1 is d1, which satisfies the following relational formula: 0.1≤d1≤0.31, which is beneficial to realize ultra-thinning. Preferably, 0.17≤d1≤0.25.

In this embodiment, the object side surface of the second lens L2 is convex at the paraxial position, and the image side surface is convex at the paraxial position, and has a positive refractive power.

The focal length of the overall imaging optical lens 10 is f, and the focal length of the second lens L2 is f2, which satisfies the following relationship: 0.42≤f2/f≤1.39. The spherical aberration generated by the first lens L1 having negative refractive power and the amount of field curvature of the system are effectively balanced. Preferably, 0.67≤f2/f≤1.11.

The radius of curvature of the object side of the second lens L2 is R3, and the radius of curvature of the image side of the second lens L2 is R4, which satisfy the following relationship: -1.95≤(R3+R4)/(R3-R4)≤-0.24, which specifies the first When the shape of the second lens L2 is outside the range, it is difficult to correct the problem of axial chromatic aberration as the lens becomes ultra-thin and wide-angle. Preferably, -1.22≤(R3+R4)/(R3-R4)≤-0.3.

The on-axis thickness of the second lens L2 is d3, which satisfies the following relationship: 0.24≤d3≤0.84, which is beneficial to realize ultra-thinning. Preferably, 0.38≤d3≤0.67.

In this embodiment, the object side surface of the third lens L3 is convex at the paraxial position, and the image side surface is concave at the paraxial position, and has a negative refractive power.

The focal length of the overall imaging optical lens 10 is f, and the focal length of the third lens L3 is f3, which satisfies the following relationship: -22.58≤f3/f≤-3.08, which is beneficial for the system to obtain a good ability to balance the field curvature, so as to effectively improve the image quality. Preferably, -14.12≤f3/f≤-3.86.

The curvature radius of the object side of the third lens L3 is R5, and the curvature radius of the image side of the third lens L3 is R6, which satisfy the following relationship: 3.21≤(R5+R6)/(R5-R6)≤22.85, which can effectively control the third lens L3. The shape of the lens L3 is beneficial to the molding of the third lens L3, and avoids molding defects and stress caused by the excessively large surface curvature of the third lens L3. Preferably, 5.13≤(R5+R6)/(R5-R6)≤18.28.

The axial thickness of the third lens L3 is d5, which satisfies the following relational expression: 0.11≤d5≤0.37, which is conducive to realizing ultra-thinning. Preferably, 0.18≤d5≤0.3.

In this embodiment, the object side surface of the fourth lens L4 is convex at the paraxial position, and the image side surface is concave at the paraxial position, and has a negative refractive power.

The focal length of the overall imaging optical lens 10 is f, and the focal length of the fourth lens L4 is f4, which satisfies the following relationship: -9.92≤f4/f≤-2.42, through the reasonable distribution of optical power, the system has better imaging quality and lower sensitivity. Preferably, -6.20≤f4/f≤-3.02.

The radius of curvature of the object side of the fourth lens L4 is R7, and the radius of curvature of the image side of the fourth lens L4 is R8, which satisfies the following relationship: 1.39≤(R7+R8)/(R7-R8)≤5.63. When the shape of the lens L4 is out of range, it is difficult to correct problems such as aberration of the off-axis picture angle with the development of ultra-thin and wide-angle. Preferably, 2.23≤(R7+R8)/(R7-R8)≤4.51.

The axial thickness of the fourth lens L4 is d7, which satisfies the following relational formula: 0.15≤d7≤0.68, which is conducive to realizing ultra-thinning. Preferably, 0.23≤d7≤0.55.

In this embodiment, the object side surface of the fifth lens L5 is concave at the paraxial position, and the image side surface is convex at the paraxial position, and has a positive refractive power.

The focal length of the overall imaging optical lens 10 is f, and the focal length of the fifth lens L5 is f5, which satisfies the following relationship: 0.19≤f5/f≤0.76, the limitation of the fifth lens L5 can effectively make the light angle of the imaging lens gentle, Reduce tolerance sensitivity. Preferably, 0.31≤f5/f≤0.61.

The radius of curvature of the object side of the fifth lens L5 is R9, and the radius of curvature of the image side of the fifth lens L5 is R10, which satisfies the following relationship: 0.67≤(R9+R10)/(R9-R10)≤2.27, which specifies the fifth When the shape of the lens L5 is outside the range of conditions, it is difficult to correct problems such as aberrations in the off-axis picture angle with the development of ultra-thin and wide-angle. Preferably, 1.06≤(R9+R10)/(R9-R10)≤1.82.

The on-axis thickness of the fifth lens L5 is d9, which satisfies the following relational formula: 0.41≤d9≤2.12, which is conducive to realizing ultra-thinning. Preferably, 0.66≤d9≤1.69.

In this embodiment, the object side surface of the sixth lens L6 is a concave surface at the paraxial position, and has a negative refractive power.

The focal length of the overall imaging optical lens 10 is f, and the focal length of the sixth lens L6 is f6, which satisfies the following relationship: -10.66≤f6/f≤-1.0, through the reasonable distribution of optical power, the system has better imaging quality and lower sensitivity. Preferably, -6.67≤f6/f≤-1.25.

The radius of curvature of the object side of the sixth lens L6 is R11, and the radius of curvature of the image side of the sixth lens L6 is R12, which satisfies the following relationship: -3.46≤(R11+R12)/(R11-R12)≤0.43, which specifies that the first When the shape of the six-lens L6 is outside the range of conditions, it is difficult to correct problems such as aberrations in the off-axis picture angle with the development of ultra-thin and wide-angle. Preferably, -2.16≤(R11+R12)/(R11-R12)≤0.35.

The axial thickness of the sixth lens L6 is d11, which satisfies the following relational expression: 0.13≤d11≤0.91, which is conducive to realizing ultra-thinning. Preferably, 0.21≤d11≤0.73.

In this embodiment, the object side surface of the seventh lens L7 is convex at the paraxial position, and the image side surface is concave at the paraxial position, and has a negative refractive power.

The focal length of the overall imaging optical lens 10 is f, the focal length of the seventh lens L7 is f7, and the following relationship is satisfied: -1.24≤f7/f≤-0.28, through the reasonable distribution of optical power, the system has better imaging quality and lower sensitivity; preferably, -0.78≤f7/f≤-0.35.

The curvature radius of the object side surface of the seventh lens L7 is R13, and the curvature radius of the seventh lens image side surface is R14, which satisfy the following relationship: 0.74≤(R13+R14)/(R13-R14)≤2.74, the specified It is the shape of the seventh lens L7, and when it is outside the conditions, it is difficult to correct problems such as aberrations in the off-axis picture angle with the development of ultra-thin and wide-angle lenses. Preferably, 1.19≤(R13+R14)/(R13-R14)≤2.19.

The axial thickness of the seventh lens L7 is d13, which satisfies the following relational formula: 0.1≤d13≤0.98, which is beneficial to realize ultra-thinning. Preferably, 0.16≤d13≤0.78.

In this embodiment, the total optical length TTL of the imaging optical lens 10 is less than or equal to 6.08 mm, which is conducive to realizing ultra-thinning. Preferably, the total optical length TTL of the imaging optical lens 10 is less than or equal to 5.8 mm.

In the present embodiment, the aperture F number of the imaging optical lens 10 is 2.27 or less. Large aperture, good imaging performance. Preferably, the aperture F number of the imaging optical lens 10 is less than or equal to 2.22.

With such a design, the total optical length TTL of the entire 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 by way of examples. The symbols described in each example are as follows. Distance, radius and center thickness are in mm.

TTL: optical length (the on-axis distance from the object side of the first lens L1 to the imaging plane);

Preferably, an inflection point and/or a stagnation point may also be set on the object side and/or the image side of the lens to meet high-quality imaging requirements. For specific implementations, see below.

The design data of the imaging optical lens 10 according to the first embodiment of the present invention is shown below, and the unit of focal length, distance, radius and center thickness is mm.

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】

Here, the meaning of each symbol is as follows.

S1: aperture;

R: the radius of curvature of the optical surface, the central radius of curvature in the case of a 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 curvature radius of the object side surface of the third lens L3;

R6: the curvature radius of the image side surface of the third lens L3;

R7: the radius of curvature of the object side surface of the fourth lens L4;

R8: the curvature radius 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 curvature radius 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 curvature radius 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 curvature radius of the image side surface of the seventh lens L7;

R15: the radius of curvature of the object side of the optical filter GF;

R16: The curvature radius of the image side 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 surface of the first lens L1;

d1: the on-axis thickness of the first lens L1;

d2: the on-axis distance from the image side of the first lens L1 to the object side of the second lens L2;

d3: the on-axis thickness of the second lens L2;

d4: the on-axis distance from the image side of the second lens L2 to the object side of the third lens L3;

d5: the on-axis thickness of the third lens L3;

d6: the on-axis distance from the image side of the third lens L3 to the object side of the fourth lens L4;

d7: the on-axis thickness of the fourth lens L4;

d8: the on-axis distance from the image side of the fourth lens L4 to the object side of the fifth lens L5;

d9: the on-axis thickness of the fifth lens L5;

d10: the on-axis distance from the image side of the fifth lens L5 to the object side of the sixth lens L6;

d11: the on-axis thickness of the sixth lens L6;

d12: the on-axis distance from the image side of the sixth lens L6 to the object side of the seventh lens L7;

d13: the on-axis thickness of the seventh lens L7;

d14: the on-axis distance from the image side of the seventh lens L7 to the object side of the optical filter GF;

d15: On-axis thickness of optical filter GF;

d16: the axial distance from the image side of the optical filter GF to the image plane;

nd: the refractive index of the 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;

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;

vg: Abbe number of optical filter GF.

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

【Table 2】

Among them, k is the conic coefficient, A4, A6, A8, A10, A12, A14, A16 are aspheric coefficients.

IH: like high

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 (1)

For convenience, the aspherical surfaces of the respective lens surfaces use the aspherical surfaces shown in the above formula (1). However, the present invention is not limited to the aspheric polynomial form represented by this formula (1).

Table 3 and Table 4 show the design data of the inflection point and the stagnation point of each lens in the imaging optical lens 10 according to the first embodiment of the present invention. Among them, R1 and R2 represent the object side and image side of the first lens L1 respectively, R3 and R4 represent the object side and image side of the second lens L2 respectively, R5 and R6 respectively represent the object side and image side of the third lens L3, R7 and R8 represent the object side and image side of the fourth lens L4 respectively, R9 and R10 respectively represent the object side and the image side of the fifth lens L5, R11 and R12 respectively represent the object side and the image side of the sixth lens L6, R13, R14 represents the object side and the image side of the seventh lens L7, respectively. The corresponding data in the column of “inflection point position” is the vertical distance from the inflection point set on the surface of each lens to the optical axis of the imaging optical lens 10 . The corresponding data in the column of "stagnation point position" is the vertical distance from the stagnation point set on the surface of each lens to the optical axis of the imaging optical lens 10 .

【table 3】

【Table 4】

Number of stagnation points stagnation position 1 R1 0 R2 0 R3 0 R4 1 0.145 R5 1 0.815 R6 0 R7 1 0.435 R8 1 0.835 R9 1 1.015 R10 1 1.595 R11 0 R12 1 1.285 R13 1 1.105 R14 1 1.865

2 and 3 respectively show schematic diagrams of axial aberration and chromatic aberration of magnification after light with wavelengths of 470 nm, 555 nm and 650 nm passes through the imaging optical lens 10 of the first embodiment. FIG. 4 shows a schematic diagram of the 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 in the meridional direction. song.

The following Table 13 shows the values corresponding to the various numerical values in each of Examples 1, 2, and 3 and the parameters specified in the conditional expressions.

As shown in Table 13, the first embodiment satisfies each conditional expression.

In this embodiment, the entrance pupil diameter of the imaging optical lens is 1.732mm, the image height of the full field of view is 2.994mm, the angle of view in the diagonal direction is 76.79°, wide-angle and ultra-thin. External chromatic aberration is fully corrected, and it has excellent optical characteristics.

(Second Embodiment)

The second embodiment is basically the same as the first embodiment, the meanings of symbols are the same as those 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 aspherical 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 the stagnation point of each lens in the imaging optical lens 20 according to the second embodiment of the present invention.

【Table 7】

Number of inflection points Inflection point position 1 Inflection point position 2 Inflection point position 3 R1 0 R2 1 0.745 R3 1 0.755 R4 0 R5 2 0.455 1.025 R6 1 0.585 R7 1 0.245 R8 2 0.415 1.035 R9 1 0.725 R10 1 0.995 R11 0 R12 0 R13 3 0.765 2.055 2.295 R14 2 0.685 2.605

【Table 8】

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

As shown in Table 13, the second embodiment satisfies each conditional expression.

In this embodiment, the entrance pupil diameter of the imaging optical lens is 1.713mm, the image height of the full field of view is 2.994mm, the field of view in the diagonal direction is 77.59°, wide-angle, ultra-thin, on-axis, on-axis External chromatic aberration is fully corrected, and it has excellent optical characteristics.

(third embodiment)

The third embodiment is basically the same as the first embodiment, the meanings of symbols are the same as those 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 aspherical 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 inflection point and stagnation point design data of each lens in the imaging optical lens 30 according to the third embodiment of the present invention.

【Table 11】

【Table 12】

Number of stagnation points stagnation position 1 stagnation position 2 R1 1 0.235 R2 1 0.345 R3 0 R4 0 R5 0 R6 1 0.985 R7 1 0.415 R8 2 0.695 1.185 R9 1 1.215 R10 0 R11 0 R12 0 R13 1 1.925 R14 1 2.235

10 and 11 respectively show schematic diagrams of axial aberration and chromatic aberration of magnification after light with wavelengths of 470 nm, 555 nm and 650 nm passes 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 13 lists the numerical values corresponding to each conditional expression in the present embodiment according to the above-mentioned conditional expression. Obviously, the imaging optical system of the present embodiment satisfies the above-mentioned conditional expression.

In this embodiment, the entrance pupil diameter of the imaging optical lens is 1.729mm, the image height of the full field of view is 2.994mm, the angle of view in the diagonal direction is 76.78°, wide-angle, ultra-thin, on-axis, on-axis External chromatic aberration is fully corrected, and it has excellent optical characteristics.

【Table 13】

Parameters and Conditionals Example 1 Example 2 Example 3 f 3.810 3.769 3.805 f1 -12.586 -37.314 -24.731 f2 3.528 3.175 3.435 f3 -43.029 -17.440 -29.944 f4 -16.891 -13.659 -18.864 f5 1.925 1.849 1.470 f6 -20.318 -5.645 -7.923 f7 -2.052 -2.337 -1.585 f6/f7 9.900 2.415 5.000 (R1+R2)/(R1-R2) 8.981 -9.998 2.001 (R3+R4)/(R3-R4) -0.976 -0.383 -0.366 (R5+R6)/(R5-R6) 15.232 6.414 11.919 (R7+R8)/(R7-R8) 3.505 2.785 3.754 (R9+R10)/(R9-R10) 1.330 1.515 1.376 (R11+R12)/(R11-R12) 0.288 -1.551 -1.731 (R13+R14)/(R13-R14) 1.580 1.827 1.488 f1/f -3.303 -9.900 -6.500 f2/f 0.926 0.842 0.903 f3/f -11.292 -4.627 -7.870 f4/f -4.433 -3.624 -4.958 f5/f 0.505 0.491 0.386 f6/f -5.332 -1.498 -2.082 f7/f -0.539 -0.620 -0.416 d1 0.209 0.208 0.210 d3 0.470 0.534 0.560 d5 0.228 0.247 0.244 d7 0.455 0.321 0.292 d9 1.162 0.824 1.410 d11 0.604 0.268 0.283 d13 0.200 0.650 0.500 Fno 2.200 2.200 2.200 TTL 5.472 5.176 5.526 d13/TTL 0.037 0.126 0.090 n1 1.6713 1.6713 1.6713 n2 1.5445 1.5445 1.5445 n3 1.6713 1.6713 1.6713 n4 1.6713 1.6713 1.6713 n5 1.5449 1.5352 1.5352 n6 1.5449 1.5352 1.5352 n7 1.7130 1.8042 1.8830

Those 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 in form and details without departing from the spirit and the spirit of the present invention. scope.

Claims (20)

1. An imaging optical lens, characterized in that, the imaging optical lens comprises in sequence from the object side to the image side: a first lens with a negative refractive power, a second lens with a positive refractive power, and a negative refractive power the third lens, the fourth lens with negative refractive power, the fifth lens with positive refractive power, the sixth lens with negative refractive power, and the seventh lens with negative refractive power; The focal length of the imaging optical lens is f, the focal length of the first lens is f1, the radius of curvature of the object side of the first lens is R1, the radius of curvature of the image side of the first lens is R2, and the seventh The refractive index of the lens is n7, the axial thickness of the seventh lens is d13, the focal length of the sixth lens is f6, the focal length of the seventh lens is f7, and the total optical length of the imaging optical lens is TTL, Satisfy the following relation: -10≤f1/f≤-3.1; 1.7≤n7≤2.2; 1≤f6/f7≤10; -10≤(R1+R2)/(R1-R2)≤10; 0.01≤d13/TTL≤0.2. 2. The imaging optical lens according to claim 1, wherein the imaging optical lens satisfies the following relation: -9.95≤f1/f≤-3.2; 1.706≤n7≤2.1; 1.71≤f6/f7≤9.95; -9.999≤(R1+R2)/(R1-R2)≤9.49; 0.023≤d13/TTL≤0.163. 3. The imaging optical lens according to claim 1, wherein the on-axis thickness of the first lens is d1, and satisfies the following relational expression: 0.1mm≤d1≤0.31mm. 4. The imaging optical lens according to claim 3, wherein the imaging optical lens satisfies the following relational expression: 0.17mm≤d1≤0.25mm. 5. The imaging optical lens according to claim 1, wherein the object side of the second lens is convex in the paraxial direction, and the image side surface is convex in the paraxial direction; The focal length of the imaging optical lens is f, the focal length of the second lens is f2, the curvature radius of the object side of the second lens is R3, the curvature radius of the image side of the second lens is R4, and the second lens has a curvature radius of R4. The on-axis thickness of the lens is d3 and satisfies the following relationship: 0.42≤f2/f≤1.39; -1.95≤(R3+R4)/(R3-R4)≤-0.24; 0.24mm≤d3≤0.84mm. 6. The imaging optical lens according to claim 5, wherein the imaging optical lens satisfies the following relation: 0.67≤f2/f≤1.11; -1.22≤(R3+R4)/(R3-R4)≤-0.3; 0.38mm≤d3≤0.67mm. 7 . The imaging optical lens according to claim 1 , wherein the object side of the third lens is convex on the paraxial axis, and the image side surface is concave on the paraxial axis; 7 . The focal length of the imaging optical lens is f, 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 third lens has a radius of curvature of R6. The on-axis thickness of the lens is d5 and satisfies the following relationship: -22.58≤f3/f≤-3.08; 3.21≤(R5+R6)/(R5-R6)≤22.85; 0.11mm≤d5≤0.37mm. 8. The imaging optical lens according to claim 7, wherein the imaging optical lens satisfies the following relational expression: -14.12≤f3/f≤-3.86; 5.13≤(R5+R6)/(R5-R6)≤18.28; 0.18mm≤d5≤0.3mm. 9 . The imaging optical lens according to claim 1 , wherein the object side of the fourth lens is convex on the paraxial axis, and the image side surface is concave on the paraxial axis; 10 . The focal length of the imaging optical lens is f, 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 fourth lens has a radius of curvature of R8. The on-axis thickness of the lens is d7 and satisfies the following relationship: -9.92≤f4/f≤-2.42; 1.39≤(R7+R8)/(R7-R8)≤5.63; 0.15mm≤d7≤0.68mm. 10. The imaging optical lens according to claim 9, wherein the imaging optical lens satisfies the following relation: -6.20≤f4/f≤-3.02; 2.23≤(R7+R8)/(R7-R8)≤4.51; 0.23mm≤d7≤0.55mm. 11. The imaging optical lens according to claim 1, wherein the object side of the fifth lens is concave on the paraxial axis, and the image side surface is convex on the paraxial axis; The focal length of the imaging optical lens is f, 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 fifth lens has a radius of curvature of R10. The on-axis thickness of the lens is d9 and satisfies the following relationship: 0.19≤f5/f≤0.76; 0.67≤(R9+R10)/(R9-R10)≤2.27; 0.41mm≤d9≤2.12mm. 12. The imaging optical lens according to claim 11, wherein the imaging optical lens satisfies the following relationship: 0.31≤f5/f≤0.61; 1.06≤(R9+R10)/(R9-R10)≤1.82; 0.66mm≤d9≤1.69mm. 13. The imaging optical lens according to claim 1, wherein the object side surface of the sixth lens is concave on the paraxial axis; The focal length of the imaging optical lens is f, 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 sixth lens has a radius of curvature of R12. The on-axis thickness of the lens is d11 and satisfies the following relation: -10.66≤f6/f≤-1.0; -3.46≤(R11+R12)/(R11-R12)≤0.43; 0.13mm≤d11≤0.91mm. 14. The imaging optical lens according to claim 13, wherein the imaging optical lens satisfies the following relation: -6.67≤f6/f≤-1.25; -2.16≤(R11+R12)/(R11-R12)≤0.35; 0.21mm≤d11≤0.73mm. 15. The imaging optical lens according to claim 1, wherein the object side of the seventh lens is convex on the paraxial axis, and the image side surface is concave on the paraxial axis; The focal length of the imaging optical lens is f, 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 seventh lens has a radius of curvature of R14. The on-axis thickness of the lens is d13 and satisfies the following relationship: 0.74≤(R13+R14)/(R13-R14)≤2.74; -1.24≤f7/f≤-0.28; 0.1mm≤d13≤0.98mm. 16. The imaging optical lens according to claim 15, wherein the imaging optical lens satisfies the following relationship: 1.19≤(R13+R14)/(R13-R14)≤2.19; -0.78≤f7/f≤-0.35; 0.16mm≤d13≤0.78mm. 17 . The imaging optical lens according to claim 1 , wherein the total optical length TTL of the imaging optical lens is less than or equal to 6.08 mm. 18 . 18 . The imaging optical lens according to claim 17 , wherein the total optical length TTL of the imaging optical lens is less than or equal to 5.8 mm. 19 . 19 . The imaging optical lens according to claim 1 , wherein the F-number of the aperture of the imaging optical lens is less than or equal to 2.27. 20 . 20 . The imaging optical lens according to claim 1 , wherein the F-number of the aperture of the imaging optical lens is less than or equal to 2.22. 21 .

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