CN109839723B - Camera optics - Google Patents

Abstract

The invention relates to the field of optical lenses, and discloses an image pickup optical lens, which 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, and a seventh lens; the first lens is made of plastic, the second lens is made of plastic, the third lens is made of glass, the fourth lens is made of plastic, the fifth lens is made of plastic, the sixth lens is made of plastic, and the seventh lens is made of plastic; and satisfies the following relationships: f1/f is more than or equal to 1.51 and less than or equal to 2.50; n3 is more than or equal to 1.70 and less than or equal to 2.20; f3/f4 is more than or equal to 0.00 and less than or equal to 2.00; -10.00 ≤ (R13+ R14)/(R13-R14) is ≤ 10.00; d5/TTL is more than or equal to 0.01 and less than or equal to 0.20. The imaging optical lens can obtain high imaging performance and low TTL.

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, and the photosensitive devices of general photographic lenses are nothing more than Charge Coupled Device (CCD) or Complementary Metal Oxide Semiconductor Device (Complementary Metal Semiconductor). -OxideSemicondctor Sensor, CMOS Sensor), and due to the improvement of semiconductor manufacturing technology, the pixel size of the photosensitive device has been reduced, and the current electronic products have good functions, thin and short appearance as the development trend, so it has good The miniaturized camera lens with imaging quality 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, characterized in that, the imaging optical lens, from the object side to the image side, sequentially includes: a first lens, a second lens, and a third lens , the fourth lens, the fifth lens, the sixth lens, and the seventh lens;

The first lens is made of plastic, the second lens is made of plastic, the third lens is made of glass, the fourth lens is made of plastic, the fifth lens is made of plastic, and the sixth lens is made of plastic is made of plastic material, and the seventh lens is made of plastic material;

The focal length of the imaging optical lens is f, the focal length of the first lens is f1, the focal length of the third lens is f3, the focal length of the fourth lens is f4, and the refractive index of the third lens is n3 , the axial thickness of the third lens is d5, the optical total length of the imaging optical lens is TTL, the curvature radius of the object side of the seventh lens is R13, the curvature radius of the image side of the seventh lens is R14, Satisfy the following relation:

1.51≤f1/f≤2.50;

1.70≤n3≤2.20;

0.00≤f3/f4≤2.00;

-10.00≤(R13+R14)/(R13-R14)≤10.00;

0.01≤d5/TTL≤0.20.

Preferably, the imaging optical lens satisfies the following relationship:

1.71≤n3≤2.10;

0.05≤f3/f4≤1.99;

-9.95≤(R13+R14)/(R13-R14)≤10.00;

0.03≤d5/TTL≤0.17.

Preferably, the first lens has a positive refractive power, the object side surface is convex on the paraxial axis, and the image side surface is concave on the paraxial axis; the curvature radius of the object side surface of the first lens is R1, and the image side of the first lens is concave. The curvature radius of the side surface is R2, and the on-axis thickness of the first lens is d1, and the following relationship is satisfied: -10.10≤(R1+R2)/(R1-R2)≤-1.88; 0.03≤d1/TTL≤ 0.13.

Preferably, the imaging optical lens satisfies the following relationship: -6.31≤(R1+R2)/(R1-R2)≤-2.35; 0.04≤d1/TTL≤0.10.

Preferably, the second lens has a positive 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 second lens is f2, and the curvature of the object side of the second lens is The radius is R3, the radius of curvature of the image side surface of the second lens is R4, the on-axis thickness of the second lens is d3, and the following relationship is satisfied: 0.87≤f2/f≤3.52; -5.19≤(R3+R4 )/(R3-R4)≤-1.39; 0.03≤d3/TTL≤0.10.

Preferably, the imaging optical lens satisfies the following relationship: 1.39≤f2/f≤2.81; -3.25≤(R3+R4)/(R3-R4)≤-1.74; 0.04≤d3/TTL≤0.08.

Preferably, the third lens has a negative refractive power, and its image side is concave at the paraxial axis; the curvature radius of the object side of the third lens is R5, and the curvature radius of the image side of the third lens is R6, and satisfies the The following relationship: -14.14≤f3/f≤-2.11; 0.10≤(R5+R6)/(R5-R6)≤5.19.

Preferably, the imaging optical lens satisfies the following relationship: -8.84≤f3/f≤-2.63; 0.15≤(R5+R6)/(R5-R6)≤4.15.

Preferably, the fourth lens has a negative refractive power, and its image side is concave in the paraxial direction; the curvature radius of the object side of the fourth lens is R7, the curvature radius of the image side of the fourth lens is R8, and the The axial thickness of the fourth lens is d7, and satisfies the following relational expressions: -63.65≤f4/f≤-2.37; 0.20≤(R7+R8)/(R7-R8)≤5.25; 0.02≤d7/TTL≤0.19.

Preferably, the imaging optical lens satisfies the following relationship: -39.78≤f4/f≤-2.96; 0.32≤(R7+R8)/(R7-R8)≤4.20; 0.03≤d7/TTL≤0.15.

Preferably, the fifth 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 fifth lens is f5, and the curvature of the object side of the fifth lens is The radius is R9, the radius of curvature of the image side surface of the fifth lens is R10, the axial thickness of the fifth lens is d9, and the following relationship is satisfied: -3.86≤f5/f≤-1.04; 1.52≤(R9+ R10)/(R9-R10)≤6.26; 0.02≤d9/TTL≤0.11.

Preferably, the imaging optical lens satisfies the following relationship: -2.41≤f5/f≤-1.30; 2.44≤(R9+R10)/(R9-R10)≤5.01; 0.03≤d9/TTL≤0.09.

Preferably, the sixth lens has a positive 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 sixth lens is f6, and the curvature of the object side of the sixth lens is The radius 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 following relationship is satisfied: 0.63≤f6/f≤3.00;-8.56≤(R11+R12 )/(R11-R12)≤-1.72; 0.03≤d11/TTL≤0.12.

Preferably, the imaging optical lens satisfies the following relationship: 1.01≤f6/f≤2.40; -5.35≤(R11+R12)/(R11-R12)≤-2.15; 0.06≤d11/TTL≤0.09.

Preferably, the object side of the seventh lens is convex on the paraxial axis, and the image side is concave on the paraxial axis; the focal length of the seventh lens is f7, the on-axis thickness of the seventh lens is d13, and satisfies The following relationship: -188.84≤f7/f≤2.58; 0.08≤d13/TTL≤0.26.

Preferably, the imaging optical lens satisfies the following relationship: -118.03≤f7/f≤2.06; 0.13≤d13/TTL≤0.21.

Preferably, the total optical length TTL of the imaging optical lens is less than or equal to 7.02 mm.

Preferably, the total optical length TTL of the imaging optical lens is less than or equal to 6.70 mm.

Preferably, the aperture F number of the imaging optical lens is less than or equal to 2.06.

Preferably, the aperture F number of the imaging optical lens is less than or equal to 2.02.

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 glass 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 plastic.

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 1.51≤f1/f≤2.50, which defines the positive refractive power of the first lens L1. When the lower limit value is exceeded, although it is beneficial to the development of ultra-thin lenses, the positive 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 wide-angle lenses. Conversely, when the upper limit value is exceeded, the positive refractive power of the first lens becomes too weak, making it difficult for the lens to develop ultra-thin.

The refractive index of the third lens L3 is defined as n3, 1.70≤n3≤2.20, which specifies the refractive index of the third lens L3, which is more conducive to the development of ultra-thinning and correction of aberrations. Preferably, 1.71≤n3≤2.10 is satisfied.

The focal length of the third lens L3 is defined as f3, the focal length of the fourth lens L4 is f4, 0.00≤f3/f4≤2.00, and the ratio of the focal length f3 of the third lens L3 to the focal length f4 of the fourth lens L4 is defined , which can effectively reduce the sensitivity of the optical lens group for imaging and further improve the imaging quality. Preferably, 0.05≤f3/f4≤1.99 is satisfied.

The curvature radius of the object side surface of the seventh lens L7 is defined as R13, the curvature radius of the image side surface of the seventh lens L7 is R14, -10.00≤(R13+R14)/(R13-R14)≤10.00, and the seventh When the shape of the lens L7 is outside the range, it is difficult to correct problems such as aberrations of the off-axis picture angle as the angle becomes ultra-thin and wide. Preferably, -9.95≤(R13+R14)/(R13-R14)≤10.00 is satisfied.

The axial thickness of the third lens L3 is d5, and the total optical length of the imaging optical lens is TTL, 0.01≤d5/TTL≤0.20, which defines the difference between the axial thickness of the third lens L3 and the total optical length TTL of the imaging optical lens 10. ratio, which is conducive to achieving ultra-thinning. Preferably, 0.03≤d5/TTL≤0.17 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 object side surface of the first lens L1 is convex at the paraxial position, and the image side surface is concave at the paraxial position, and has positive refractive power.

The curvature radius R1 of the object side of the first lens L1 and the curvature radius R2 of the image side of the first lens L1 satisfy the following relationship: -10.10≤(R1+R2)/(R1-R2)≤-1.88, the first lens is reasonably controlled , so that the first lens can effectively correct the spherical aberration of the system; preferably, -6.31≤(R1+R2)/(R1-R2)≤-2.35.

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≤0.13, which is conducive to realizing ultra-thinning. Preferably, 0.04≤d1/TTL≤0.10.

In this embodiment, the object side surface of the second lens L2 is convex at the paraxial position, and the image side surface is concave at the paraxial position, and has 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: 0.87≤f2/f≤3.52. By controlling the positive refractive power of the second lens L2 within a reasonable range, it is beneficial to correct the optical system aberration. Preferably, 1.39≤f2/f≤2.81.

The curvature radius R3 of the object side of the second lens L2 and the curvature radius R4 of the image side of the second lens L2 satisfy the following relationship: -5.19≤(R3+R4)/(R3-R4)≤-1.39, which specifies that the second lens When the shape of the L2 is outside the range, it is difficult to correct the aberration problem as the lens becomes ultra-thin and wide-angle. Preferably, -3.25≤(R3+R4)/(R3-R4)≤-1.74.

The axial thickness of the second lens L2 is d3, and the total optical length of the imaging optical lens 10 is TTL, which satisfies the following relationship: 0.03≤d3/TTL≤0.10, which is conducive to realizing ultra-thinning. Preferably, 0.04≤d3/TTL≤0.08.

In this embodiment, the image side surface of the third lens L3 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 third lens L3 is f3, and the following relationship is satisfied: -14.14≤f3/f≤-2.11, 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, -8.84≤f3/f≤-2.63.

The curvature radius R5 of the object side of the third lens L3 and the curvature radius R6 of the image side of the third lens L3 satisfy the following relationship: 0.10≤(R5+R6)/(R5-R6)≤5.19, which can effectively control the third lens L3 The shape of the third 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, 0.15≤(R5+R6)/(R5-R6)≤4.15.

In this embodiment, the image side surface of the fourth lens L4 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: -63.65≤f4/f≤-2.37, through the reasonable distribution of the optical power, the system has better imaging quality and better imaging quality. low sensitivity. Preferably, -39.78≤f4/f≤-2.96.

The curvature radius R7 of the object side of the fourth lens L4 and the curvature radius R8 of the image side of the fourth lens L4 satisfy the following relationship: 0.20≤(R7+R8)/(R7-R8)≤5.25, which specifies that the fourth lens L4 When the shape is out of range, with the development of ultra-thin and wide-angle, it is difficult to correct problems such as aberration of the off-axis picture angle. Preferably, 0.32≤(R7+R8)/(R7-R8)≤4.20.

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≤0.19, which is beneficial to realize ultra-thinning. Preferably, 0.03≤d7/TTL≤0.15.

In this embodiment, the object side surface of the fifth lens L5 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 fifth lens L5 is f5, which satisfies the following relationship: -3.86≤f5/f≤-1.04, the limitation of the fifth lens L5 can effectively make the light angle of the imaging lens gentle, Reduce tolerance sensitivity. Preferably, -2.41≤f5/f≤-1.30.

The curvature radius R9 of the object side of the fifth lens L5 and the curvature radius R10 of the image side of the fifth lens L5 satisfy the following relationship: 1.52≤(R9+R10)/(R9-R10)≤6.26, which specifies the fifth lens L5 When the shape is outside the conditions, it is difficult to correct the aberration of the off-axis picture angle with the development of ultra-thin and wide-angle. Preferably, 2.44≤(R9+R10)/(R9-R10)≤5.01.

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≤0.11, which is conducive to realizing ultra-thinning. Preferably, 0.03≤d9/TTL≤0.09.

In this embodiment, the object side surface of the sixth lens L6 is convex at the paraxial position, and the image side surface is concave at the paraxial position, and has positive 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: 0.63≤f6/f≤3.00, through the reasonable distribution of optical power, the system has better imaging quality and lower Sensitivity. Preferably, 1.01≤f6/f≤2.40.

The curvature radius R11 of the object side surface of the sixth lens L6 and the curvature radius R12 of the image side surface of the sixth lens L6 satisfy the following relationship: -8.56≤(R11+R12)/(R11-R12)≤-1.72, which specifies that the sixth When the shape of the lens L6 is outside the range of conditions, 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, -5.35≤(R11+R12)/(R11-R12)≤-2.15.

The axial thickness of the sixth lens L6 is d11, and the optical total length of the imaging optical lens 10 is TTL, which satisfies the following relational formula: 0.03≤d11/TTL≤0.12, which is conducive to realizing ultra-thinning. Preferably, 0.06≤d11/TTL≤0.09.

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

The focal length of the overall imaging optical lens 10 is f, and the focal length of the seventh lens L7 is f7, which satisfies the following relationship: -188.84≤f7/f≤2.58. sensitivity. Preferably, -118.03≤f7/f≤2.06.

The axial thickness of the seventh lens L7 is d13, and the optical total length of the imaging optical lens 10 is TTL, which satisfies the following relational formula: 0.08≤d13/TTL≤0.26, which is conducive to realizing ultra-thinning. Preferably, 0.13≤d13/TTL≤0.21.

In this embodiment, the total optical length TTL of the imaging optical lens 10 is less than or equal to 7.02 mm, which is beneficial to achieve ultra-thinning. Preferably, the total optical length TTL of the imaging optical lens 10 is less than or equal to 6.70.

In this embodiment, the aperture F number of the imaging optical lens 10 is 2.06 or less. Large aperture, good imaging performance. Preferably, the aperture F number of the imaging optical lens 10 is less than or equal to 2.02.

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. The unit of focal length, on-axis distance, curvature radius, on-axis thickness, 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 plane), in mm;

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.

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 the 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 represent the object side and image side of the fifth lens L5 respectively, 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】

Number of inflection points Inflection point position 1 Inflection point position 2 Inflection point position 3 Inflection point position 4 R1 1 0.985 0 0 0 R2 1 0.445 0 0 0 R3 1 1.105 0 0 0 R4 2 0.415 1.185 0 0 R5 2 0.105 0.915 0 0 R6 2 0.205 1.125 0 0 R7 0 0 0 0 0 R8 2 0.325 1.085 0 0 R9 1 1.035 0 0 0 R10 4 0.575 0.815 1.055 2.065 R11 2 0.785 1.955 0 0 R12 3 0.675 2.125 2.245 0 R13 3 0.425 1.475 2.305 0 R14 1 0.745 0 0 0

【Table 4】

2 and 3 respectively show schematic diagrams of axial aberration and chromatic aberration of magnification after light with wavelengths of 486.1 nm, 587.6 nm and 656.3 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 587.6 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 meridional direction. Field 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 2.462mm, the image height of the full field of view is 3.925mm, the field of view in the diagonal direction is 77.13°, wide-angle, ultra-thin, on-axis, on-axis 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.

Tables 5 and 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】

Tables 7 and 8 show the inflection point and stagnation point design data 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 1 0.875 0 0 R2 1 0.435 0 0 R3 1 1.135 0 0 R4 1 0.355 0 0 R5 1 1.045 0 0 R6 1 0.175 0 0 R7 1 0.095 0 0 R8 2 0.225 1.135 0 R9 1 0.835 0 0 R10 2 0.545 2.025 0 R11 2 0.725 1.925 0 R12 3 0.605 1.965 2.285 R13 3 0.455 1.485 2.315 R14 1 0.775 0 0

【Table 8】

Number of stagnation points stagnation position 1 stagnation position 2 stagnation position 3 R1 0 0 0 0 R2 1 0.945 0 0 R3 0 0 0 0 R4 1 0.625 0 0 R5 0 0 0 0 R6 1 0.305 0 0 R7 1 0.155 0 0 R8 2 0.395 1.315 0 R9 1 1.135 0 0 R10 1 1.405 0 0 R11 1 1.365 0 0 R12 1 1.015 0 0 R13 3 0.885 2.215 2.405 R14 1 2.195 0 0

6 and 7 respectively show schematic diagrams of axial aberration and chromatic aberration of magnification after light with wavelengths of 486.1 nm, 587.6 nm and 656.3 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 587.6 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 diameter of the entrance pupil of the imaging optical lens is 2.470mm, the image height of the full field of view is 3.925mm, the angle of view in the diagonal direction is 76.93°, it is wide-angle and ultra-thin, and its on-axis, axial 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】

Number of inflection points Inflection point position 1 Inflection point position 2 Inflection point position 3 Inflection point position 4 R1 1 0.895 0 0 0 R2 1 0.495 0 0 0 R3 1 1.085 0 0 0 R4 1 0.415 0 0 0 R5 2 0.195 1.025 0 0 R6 2 0.215 1.025 0 0 R7 2 0.085 1.025 0 0 R8 2 0.455 0.775 0 0 R9 1 0.585 0 0 0 R10 4 0.495 0.935 0.985 1.925 R11 2 0.775 1.855 0 0 R12 2 0.635 1.875 0 0 R13 3 0.475 1.475 2.435 0 R14 1 0.765 0 0 0

【Table 12】

Number of stagnation points stagnation position 1 stagnation position 2 R1 0 0 0 R2 1 1.175 0 R3 0 0 0 R4 1 0.735 0 R5 1 0.345 0 R6 2 0.375 1.195 R7 2 0.135 1.215 R8 0 0 0 R9 1 1.015 0 R10 1 1.405 0 R11 1 1.425 0 R12 1 1.065 0 R13 2 0.955 2.035 R14 1 2.085 0

10 and 11 respectively show schematic diagrams of axial aberration and chromatic aberration of magnification after light with wavelengths of 486.1 nm, 587.6 nm and 656.3 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 587.6 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 diameter of the entrance pupil of the imaging optical lens is 2.474mm, the image height of the full field of view is 3.925mm, the angle of view in the diagonal direction is 76.86°, 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 4.923 4.941 4.947 f1 7.437 9.858 12.363 f2 11.547 8.596 8.960 f3 -20.268 -15.611 -34.976 f4 -20.241 -157.256 -17.585 f5 -9.498 -8.505 -7.693 f6 6.221 8.398 9.902 f7 -26.274 -466.559 8.510 Fno 2.00 2.00 2.00 f1/f 1.51 2.00 2.50 f3/f4 1.00 0.10 1.99 (R13+R14)/(R13-R14) 6.13 9.99 -9.89 d5/TTL 0.05 0.10 0.14

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. a photographic optical lens, it is characterized in that, described photographic optical lens comprises seven lenses altogether, and seven described lenses are sequentially from the object side to the image side: the first lens, the second lens, the third lens, The fourth lens, the fifth lens, the sixth lens, and the seventh lens, the first lens has a positive refractive power, the second lens has a positive refractive power, the third lens has a negative refractive power, and the first lens has a positive refractive power. The four lenses have negative refractive power, the fifth lens has negative refractive power, and the sixth lens has positive refractive power; The first lens is made of plastic, the second lens is made of plastic, the third lens is made of glass, the fourth lens is made of plastic, the fifth lens is made of plastic, and the sixth lens is made of plastic is made of plastic material, and the seventh lens is made of plastic material; 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 second lens is R3, the radius of curvature of the image side of the second lens is R4, and the third lens has a radius of curvature of R4. The focal length of the lens is f3, the focal length of the fourth lens is f4, the refractive index of the third lens is n3, the axial thickness of the third lens is d5, and the total optical length of the imaging optical lens is TTL, 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, which satisfies the following relationship: 1.51≤f1/f≤2.50; 1.70≤n3≤2.20; 0.00≤f3/f4≤2.00; -10.00≤(R13+R14)/(R13-R14)≤10.00; 0.01≤d5/TTL≤0.20; -5.19≤(R3+R4)/(R3-R4)≤-1.39. 2. The imaging optical lens according to claim 1, wherein the imaging optical lens satisfies the following relation: 1.71≤n3≤2.10; 0.05≤f3/f4≤1.99; -9.95≤(R13+R14)/(R13-R14)≤10.00; 0.03≤d5/TTL≤0.17. 3. The imaging optical lens according to claim 1, wherein the object side of the first lens is a convex surface on the paraxial axis, and the image side surface of the first lens is a concave surface on the paraxial axis; 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 on-axis thickness of the first lens is d1, and the following relationship is satisfied: -10.10≤(R1+R2)/(R1-R2)≤-1.88; 0.03≤d1/TTL≤0.13. 4. The imaging optical lens according to claim 3, wherein the imaging optical lens satisfies the following relational expression: -6.31≤(R1+R2)/(R1-R2)≤-2.35; 0.04≤d1/TTL≤0.10. 5. The imaging optical lens according to claim 1, wherein the object side of the second lens is a convex surface on the paraxial axis, and the image side surface of the second lens is a concave surface on the paraxial axis; The focal length of the second lens is f2, the on-axis thickness of the second lens is d3, and the following relationship is satisfied: 0.87≤f2/f≤3.52; 0.03≤d3/TTL≤0.10. 6. The imaging optical lens according to claim 5, wherein the imaging optical lens satisfies the following relation: 1.39≤f2/f≤2.81; -3.25≤(R3+R4)/(R3-R4)≤-1.74; 0.04≤d3/TTL≤0.08. 7. The imaging optical lens according to claim 1, wherein the image side surface of the third lens is concave on the paraxial axis; 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 following relationship is satisfied: -14.14≤f3/f≤-2.11; 0.10≤(R5+R6)/(R5-R6)≤5.19. 8. The imaging optical lens according to claim 7, wherein the imaging optical lens satisfies the following relation: -8.84≤f3/f≤-2.63; 0.15≤(R5+R6)/(R5-R6)≤4.15. 9. The imaging optical lens according to claim 1, wherein the image side surface of the fourth lens is concave on the paraxial axis; The curvature radius of the object side of the fourth lens is R7, the curvature radius of the image side of the fourth lens is R8, the axial thickness of the fourth lens is d7, and the following relationship is satisfied: -63.65≤f4/f≤-2.37; 0.20≤(R7+R8)/(R7-R8)≤5.25; 0.02≤d7/TTL≤0.19. 10. The imaging optical lens according to claim 9, wherein the imaging optical lens satisfies the following relation: -39.78≤f4/f≤-2.96; 0.32≤(R7+R8)/(R7-R8)≤4.20; 0.03≤d7/TTL≤0.15. 11 . The imaging optical lens according to claim 1 , wherein the object side of the fifth lens is convex in the paraxial direction, and the image side of the fifth lens is concave in the paraxial direction; 12 . 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 The following relationship: -3.86≤f5/f≤-1.04; 1.52≤(R9+R10)/(R9-R10)≤6.26; 0.02≤d9/TTL≤0.11. 12. The imaging optical lens according to claim 11, wherein the imaging optical lens satisfies the following relationship: -2.41≤f5/f≤-1.30; 2.44≤(R9+R10)/(R9-R10)≤5.01; 0.03≤d9/TTL≤0.09. 13. The imaging optical lens according to claim 1, wherein the object side of the sixth lens is convex in the paraxial direction, and the image side of the sixth lens is concave in the paraxial direction; 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, the on-axis thickness of the sixth lens is d11, and the The following relationship: 0.63≤f6/f≤3.00; -8.56≤(R11+R12)/(R11-R12)≤-1.72; 0.03≤d11/TTL≤0.12. 14. The imaging optical lens according to claim 13, wherein the imaging optical lens satisfies the following relation: 1.01≤f6/f≤2.40; -5.35≤(R11+R12)/(R11-R12)≤-2.15; 0.06≤d11/TTL≤0.09. 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 seventh lens is f7, the axial thickness of the seventh lens is d13, and the following relationship is satisfied: -188.84≤f7/f≤2.58; 0.08≤d13/TTL≤0.26. 16. The imaging optical lens according to claim 15, wherein the imaging optical lens satisfies the following relationship: -118.03≤f7/f≤2.06; 0.13≤d13/TTL≤0.21. 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 7.02 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 6.70 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 2.06. 20 . 20 . The imaging optical lens according to claim 19 , wherein the F-number of the aperture of the imaging optical lens is less than or equal to 2.02. 21 .

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