WO2021134274A1 - Camera optical lens - Google Patents

Abstract

A camera optical lens (10, 20, 30, 40, 50, 60) in the field of optical lenses. The camera optical lens (10, 20, 30, 40, 50, 60) sequentially comprises, from an object side to an image side, a first lens (L1), a second lens (L2), a third lens (L3), a fourth lens (L4), and a fifth lens (L5); at least one of the first lens (L1) to the fifth lens (L5) has a free-form surface, the focal length of the camera optical lens (10, 20, 30, 40, 50, 60) is f, the focal length of the first lens (L1) is f1, the focal length of the third lens (L3) is f3, and the focal length of the fourth lens (L4) is f4, and the following relational expressions are satisfied: 2.00 ≤ f1/f ≤ 6.00; and -5.50 ≤ f3/f4 ≤ -1.00. The camera optical lens (10, 20, 30, 40, 50, 60) is ultra-thin and wide-angle, and has good optical performance; in addition, as there is at least one lens having a free-form surface, aberration can be effectively corrected, further improving the performance of an optical system.

Description

Camera optical lens Technical field

This application relates to the field of optical lenses, and in particular to a camera optical lens suitable for portable terminal equipment such as smart phones and digital cameras, as well as camera devices such as monitors and PC lenses.

Background technique

With the development of imaging lenses, people have higher and higher requirements for lens imaging. The "night scene photography" and "background blur" of the lens have also become important indicators to measure the imaging standards of the lens. At present, rotationally symmetric aspheric surfaces are mostly used. Such aspheric surfaces only have sufficient degrees of freedom in the meridian plane, and cannot well correct off-axis aberrations. Free-form surface is a non-rotationally symmetric surface type, which can better balance aberrations and improve imaging quality, and the processing of free-form surfaces is gradually mature. With the increasing requirements for lens imaging, it is very important to add free-form surfaces when designing lenses, especially in the design of wide-angle and ultra-wide-angle lenses.

Summary of the invention

In view of the above-mentioned problems, the purpose of this application is to provide an imaging optical lens that has good optical performance while being ultra-thin and wide-angle. At the same time, since at least one lens contains a free-form surface, it can effectively correct aberrations and further improve the optical system. performance.

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

At least one of the first lens to the fifth lens includes a free-form surface, the focal length of the imaging optical lens is f, the focal length of the first lens is f1, and the focal length of the third lens is f3, so The focal length of the fourth lens is f4, and satisfies the following relationship:

2.00≤f1/f≤6.00;

-5.50≤f3/f4≤-1.00.

Preferably, the on-axis thickness of the second lens is d3, and the on-axis distance from the image side surface of the second lens to the object side surface of the third lens is d4, and the following relationship is satisfied:

2.00≤d3/d4≤8.00.

Preferably, the on-axis thickness of the fourth lens is d7, and the on-axis distance from the image side surface of the fourth lens to the object side surface of the fifth lens is d8, and the following relationship is satisfied:

2.20≤d7/d8≤21.00.

Preferably, the curvature radius of the object side surface of the first lens is R1, the curvature radius of the image side surface of the first lens is R2, the axial thickness of the first lens is d1, and the total optical length of the imaging optical lens is TTL, and satisfies the following relationship:

-6.47≤(R1+R2)/(R1-R2)≤8.76;

0.03≤d1/TTL≤0.13.

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

0.65≤f2/f≤2.18;

0.23≤(R3+R4)/(R3-R4)≤1.97;

0.04≤d3/TTL≤0.19.

Preferably, the radius of curvature of the object side surface of the third lens is R5, the radius of curvature of the image side surface of the third lens is R6, the axial thickness of the third lens is d5, and the total optical length of the imaging optical lens is TTL, and satisfies the following relationship:

-7.59≤f3/f≤-1.21;

-4.61≤(R5+R6)/(R5-R6)≤2.09;

0.02≤d5/TTL≤0.09.

Preferably, the radius of curvature of the object side surface of the fourth lens is R7, the radius of curvature of the image side surface of the fourth lens is R8, the axial thickness of the fourth lens is d7, and the total optical length of the imaging optical lens is TTL, and satisfies the following relationship:

0.25≤f4/f≤3.18;

0.66≤(R7+R8)/(R7-R8)≤8.68;

0.05≤d7/TTL≤0.31.

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:

-98.44≤f5/f≤-0.38;

0.70≤(R9+R10)/(R9-R10)≤12.48;

0.05≤d9/TTL≤0.19.

Preferably, the aperture F number of the imaging optical lens is Fno, and the following relational expression is satisfied:

Fno≤2.49.

Preferably, the total optical length of the imaging optical lens is TTL, and the diagonal full-field image height of the imaging optical lens is IH, and the following relationship is satisfied:

TTL/IH≤0.88.

The beneficial effects of the present application are: the imaging optical lens according to the present application has good optical performance while being ultra-thin and wide-angle. At the same time, since at least one lens contains a free-form surface, it can effectively correct aberrations and further improve the performance of the optical system, especially It is suitable for mobile phone camera lens assembly and WEB camera lens composed of high-resolution CCD, CMOS and other imaging elements.

Description of the drawings

In order to more clearly describe the technical solutions in the embodiments of the present application, the following will briefly introduce the accompanying drawings needed in the description of the embodiments. Obviously, the accompanying drawings in the following description are only some implementations of the present application. For those of ordinary skill in the art, without creative work, other drawings can be obtained based on these drawings, among which:

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

Fig. 2 is a situation in which the RMS spot diameter of the imaging optical lens shown in Fig. 1 is in the first quadrant;

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

Fig. 4 is a case where the RMS spot diameter of the imaging optical lens shown in Fig. 3 is in the first quadrant;

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

Fig. 6 is a case where the RMS spot diameter of the imaging optical lens shown in Fig. 5 is in the first quadrant;

FIG. 7 is a schematic structural diagram of an imaging optical lens according to a fourth embodiment of the present application;

FIG. 8 is a situation in which the RMS spot diameter of the imaging optical lens shown in FIG. 7 is in the first quadrant;

FIG. 9 is a schematic structural diagram of an imaging optical lens according to a fifth embodiment of the present application;

FIG. 10 is a case where the RMS spot diameter of the imaging optical lens shown in FIG. 9 is in the first quadrant;

11 is a schematic diagram of the structure of an imaging optical lens according to a sixth embodiment of the present application;

FIG. 12 is a case where the RMS spot diameter of the imaging optical lens shown in FIG. 11 is in the first quadrant.

Detailed ways

In order to make the purpose, technical solutions, and advantages of the present application clearer, the various embodiments of the present application will be described in detail below with reference to the accompanying drawings. However, those of ordinary skill in the art can understand that in each embodiment of the present application, many technical details are proposed in order to enable readers to better understand the present application. However, even without these technical details and various changes and modifications based on the following embodiments, the technical solution claimed in this application can be realized.

(First embodiment)

With reference to the drawings, the present application provides an imaging optical lens 10. FIG. 1 shows an imaging optical lens 10 according to the first embodiment of the application. The imaging optical lens 10 includes five lenses. Specifically, the imaging optical lens 10 includes a first lens L1, an aperture S1, a second lens L2, a third lens L3, a fourth lens L4, and a fifth lens L5 in sequence from the object side to the image side. An optical element such as an optical filter GF may be provided between the fifth lens L5 and the image plane Si.

The first lens L1 has positive refractive power; the second lens L2 has positive refractive power, the third lens L3 has negative refractive power, the fourth lens L4 has positive refractive power, and the fifth lens L5 has negative refractive power.

The first lens L1 to the fifth lens L5 are made of plastic material. By rationalizing the configuration of the lens material, the lens has good optical performance while being ultra-thin and wide-angle.

In this embodiment, it is defined that at least one of the first lens L1 to the fifth lens L5 includes a free-form surface. The free-form surface helps correct aberrations such as astigmatism, curvature of field, and distortion of the wide-angle optical system, and improves optical System performance.

The focal length of the imaging optical lens 10 is defined as f, the focal length of the first lens L1 is f1, and the following relationship is satisfied: 2.00≤f1/f≤6.00, which specifies the ratio of the focal length of the first lens L1 to the total focal length , Within the range of this conditional formula, the spherical aberration and field curvature of the system can be effectively balanced. Preferably, 2.09≤f1/f≤5.86 is satisfied.

Define the focal length of the third lens L3 as f3, and the focal length of the fourth lens L4 as f4, satisfying the following relationship: -5.50≤f3/f4≤-1.00, which specifies the focal length of the third lens L3 and the fourth lens The ratio of the focal length of L4, through the reasonable allocation of focal length, makes the system have better imaging quality and lower sensitivity. Preferably, -5.43≤f3/f4≤-1.02 is satisfied.

When the above conditional expression is satisfied, the imaging optical lens 10 can be made to have good optical performance while being ultra-thin and wide-angle.

The on-axis thickness of the second lens L2 is defined as d3, and the on-axis distance from the image side surface of the second lens L2 to the object side surface of the third lens L3 is d4, which satisfies the following relationship: 2.00≤d3/d4 ≤8.00, which specifies the ratio between the on-axis thickness d3 of the second lens L2 and the on-axis distance d4 from the image side surface of the second lens L2 to the object side surface of the third lens L3. When within the range of this conditional expression, Contribute to lens processing and assembly. Preferably, 2.19≤d3/d4≤7.80 is satisfied.

The on-axis thickness of the fourth lens L4 is defined as d7, and the on-axis distance from the image side surface of the fourth lens L4 to the object side surface of the fifth lens L5 is d8, which satisfies the following relationship: 2.20≤d7/d8 ≤21.00, which specifies the ratio between the on-axis thickness d7 of the fourth lens L4 and the on-axis distance d8 from the image side surface of the fourth lens L4 to the object side surface of the fifth lens L5. When it is within the range of this conditional expression, It helps to compress the total optical length and achieve ultra-thin effect. Preferably, it satisfies 2.21≤d7/d8≤20.82.

Define the curvature radius of the object side surface of the first lens L1 as R1, and the curvature radius of the image side surface of the first lens L1 as R2, which satisfies the following relationship: -6.47≤(R1+R2)/(R1-R2)≤ 8.76 , 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, -4.05≤(R1+R2)/(R1-R2)≤7.01 is satisfied.

The on-axis thickness of the first lens L1 is defined as 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 beneficial to realize ultra-thinness. Preferably, 0.05≤d1/TTL≤0.10 is satisfied.

The focal length of the second lens L2 is f2, and the focal length of the imaging optical lens 10 is f, which satisfies the following relationship: 0.65≤f2/f≤2.18. By controlling the refractive power of the second lens L2 within a reasonable range, Conducive to correcting the aberration of the optical system. Preferably, 1.04≤f2/f≤1.75 is satisfied.

The curvature radius of the object side surface of the second lens L2 is R3, and the curvature radius of the image side surface of the second lens L2 is R4, which satisfies the following relationship: 0.23≤(R3+R4)/(R3-R4)≤1.97, which is specified When the shape of the second lens L2 is within the range of this conditional expression, as the lens becomes ultra-thin and wide-angle, it is beneficial to correct the problem of axial chromatic aberration. Preferably, 0.38≤(R3+R4)/(R3-R4)≤1.57 is satisfied.

The on-axis thickness of the second lens L2 is d3, and the total optical length of the imaging optical lens 10 is TTL, which satisfies the following relationship: 0.04≤d3/TTL≤0.19, which is beneficial to realize ultra-thinness. Preferably, 0.06≤d3/TTL≤0.15 is satisfied.

The focal length of the third lens L3 is f3, and the focal length of the imaging optical lens 10 is f, which satisfies the following relational expression: -7.59≤f3/f≤-1.21, through the reasonable distribution of optical power, the system has better High imaging quality and low sensitivity. Preferably, -4.75≤f3/f≤-1.51 is satisfied.

The curvature radius of the object side surface of the third lens L3 is R5, and the curvature radius of the image side surface of the third lens L3 is R6, which satisfies the following relationship: -4.61≤(R5+R6)/(R5-R6)≤2.09, which stipulates When the shape of the third lens L3 is within the range specified by the conditional expression, the degree of deflection of the light passing through the lens can be reduced, and aberrations can be effectively reduced. Preferably, it satisfies -2.88≤(R5+R6)/(R5-R6)≤1.67.

The axial thickness of the third lens L3 is d5, and the total optical length of the imaging optical lens 10 is TTL, which satisfies the following relationship: 0.02≦d5/TTL≦0.09, which is beneficial to realize ultra-thinness. Preferably, 0.04≤d5/TTL≤0.07 is satisfied.

The focal length of the fourth lens L4 is f4, and the focal length of the imaging optical lens 10 is f, which satisfies the following relationship: 0.25≤f4/f≤3.18, which specifies the ratio of the focal length of the fourth lens L4 to the focal length of the system. When the conditional expression is within the range, it helps to improve the optical system performance. Preferably, 0.41≤f4/f≤2.55 is satisfied.

The curvature radius of the object side surface of the fourth lens L4 is R7, and the curvature radius of the image side surface of the fourth lens L4 is R8, which satisfies the following relationship: 0.66≤(R7+R8)/(R7-R8)≤8.68, which is specified The shape of the fourth lens L4 is within the range of this conditional formula, and with the development of ultra-thin and wide-angle, it is beneficial to correct the aberration of the off-axis angle of view. Preferably, 1.06≤(R7+R8)/(R7-R8)≤6.94 is satisfied.

The axial thickness of the fourth lens L4 is d7, and the total optical length of the imaging optical lens 10 is TTL, which satisfies the following relationship: 0.05≤d7/TTL≤0.31, which is beneficial to achieve ultra-thinness. Preferably, 0.09≤d7/TTL≤0.25 is satisfied.

The focal length of the fifth lens L5 is f5, and the focal length of the imaging optical lens 10 is f, which satisfies the following relationship: -98.44≤f5/f≤-0.38, which specifies the ratio of the focal length of the fifth lens L5 to the total focal length , When it is within the range of this conditional formula, it helps to reduce aberrations and improve imaging quality. Preferably, -61.53≤f5/f≤-0.48 is satisfied.

Define the radius of curvature of the object side surface of the fifth lens L5 as R9, and the radius of curvature of the image side surface of the fifth lens L5 as R10, satisfying the following relationship: 0.70≤(R9+R10)/(R9-R10)≤12.48, The shape of the fifth lens L5 is specified, and when it is within the range of the conditional expression, it helps to improve the image quality. Preferably, 1.12≤(R9+R10)/(R9-R10)≤9.98 is satisfied.

The on-axis thickness of the fifth lens L5 is defined as d9, and the total optical length of the imaging optical lens 10 is TTL, which satisfies the following relationship: 0.05≤d9/TTL≤0.19, which is conducive to achieving ultra-thinness. Preferably, 0.07≤d9/TTL≤0.15 is satisfied.

The F number of the aperture of the imaging optical lens 10 is defined as Fno, and the following relationship is satisfied: Fno≤2.49, large aperture, good imaging performance. Preferably, Fno≤2.44 is satisfied.

The diagonal full-field image height of the imaging optical lens 10 is defined as IH, and the following relationship is satisfied: TTL/IH≦0.88. Preferably, TTL/IH≤0.84 is satisfied.

In this embodiment, the total optical length TTL of the imaging optical lens 10 is less than or equal to 5.02 mm, which is beneficial to realize ultra-thinness. Preferably, the total optical length TTL is less than or equal to 4.79 mm.

When the above relationship is satisfied, the imaging optical lens 10 has good optical performance while adopting a free-form surface, which can match the design image area with the actual use area, and maximize the image quality of the effective area; according to the characteristics of the optical lens 10 The optical lens 10 is particularly suitable for mobile phone camera lens assemblies and WEB camera lenses composed of high-resolution CCD, CMOS, and other imaging elements.

The imaging optical lens 10 of the present application will be described below with an example. The symbols described in each example are as follows. The unit of focal length, on-axis distance, radius of curvature, and on-axis thickness is mm.

TTL: total optical length (the on-axis distance from the object side of the first lens L1 to the imaging surface), the unit is mm;

Table 1 and Table 2 show design data of the imaging optical lens 10 of the first embodiment of the present application. Among them, the object side surface and the image side surface of the first lens L1 are free-form surfaces.

【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 of the optical filter GF;

R12: 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 axial thickness of the optical filter GF;

d12: 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;

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;

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 application.

【Table 2】

Among them, k is the conic coefficient, A4, A6, A8, A10, A12, A14, A16, A18, A20 are the aspherical coefficients, r is the vertical distance between the point on the aspherical curve and the optical axis, and z is the aspherical depth (aspherical surface The vertical distance between the point r from the optical axis and the tangent plane tangent to the vertex on the aspheric optical axis).

z=(cr ² )/[1+{1-(k+1)(c 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, this application is not limited to the aspheric polynomial form represented by the formula (1).

Table 3 shows free-form surface data in the imaging optical lens 10 of the first embodiment of the present application.

【table 3】

Among them, k is the conic coefficient, Bi is the free-form surface coefficient, r is the vertical distance between the point on the free-form surface and the optical axis, x is the x-direction component of r, y is the y-direction component of r, and z is the aspheric depth (aspherical surface The vertical distance between the point at the upper distance of r from the optical axis and the tangent plane tangent to the vertex on the aspheric optical axis).

For convenience, each free-form surface uses the extended polynomial surface type (Extended Polynomial) shown in the above formula (2). However, this application is not limited to the free-form surface polynomial form expressed by the formula (2).

FIG. 2 shows a situation where the RMS spot diameter of the imaging optical lens 10 of the first embodiment is within the first quadrant. According to FIG. 2, it can be seen that the imaging optical lens 10 of the first embodiment can achieve good imaging quality.

The following Table 19 shows the values corresponding to various values in each of Examples 1, 2, 3, 4, 5, and 6 and the parameters specified in the conditional expressions.

As shown in Table 19, the first embodiment satisfies each conditional expression.

In this embodiment, the entrance pupil diameter ENPD of the imaging optical lens is 0.808mm, the full-field image height (diagonal direction) IH is 4.800mm, the x-direction image height is 3.840mm, and the y-direction image height is 2.880 mm, the imaging effect is best in this rectangular range. The diagonal FOV is 101.96°, the x-direction is 88.99°, the y-direction is 72.71°, wide-angle, ultra-thin, The on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.

(Second embodiment)

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

Table 4 and Table 5 show the design data of the imaging optical lens 20 according to the second embodiment of the present application. Among them, the object side surface and the image side surface of the second lens L2 are free-form surfaces.

【Table 4】

Table 5 shows the aspheric surface data of each lens in the imaging optical lens 20 of the second embodiment of the present application.

【table 5】

Table 6 shows free-form surface data in the imaging optical lens 20 of the second embodiment of the present application.

【Table 6】

FIG. 4 shows a situation where the RMS spot diameter of the imaging optical lens 20 of the second embodiment is within the first quadrant. According to FIG. 4, it can be seen that the imaging optical lens 20 of the second embodiment can achieve good imaging quality.

As shown in Table 19, the second embodiment satisfies various conditional expressions.

In this embodiment, the entrance pupil diameter ENPD of the imaging optical lens is 0.808mm, the full-field image height (diagonal direction) IH is 4.800mm, the x-direction image height is 3.840mm, and the y-direction image height is 2.880 mm, the imaging effect is best in this rectangular range, the diagonal FOV is 101.96°, the x-direction field-of-view angle is 89.11°, the y-direction field of view is 72.73°, wide-angle, ultra-thin, and its axis The 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 7 and Table 8 show the design data of the imaging optical lens 30 of the third embodiment of the present application. Among them, the object side surface and the image side surface of the first lens L1 are free-form surfaces.

【Table 7】

Table 8 shows the aspheric surface data of each lens in the imaging optical lens 30 of the third embodiment of the present application.

【Table 8】

Table 9 shows free-form surface data in the imaging optical lens 30 of the third embodiment of the present application.

【Table 9】

FIG. 6 shows a situation in which the RMS spot diameter of the imaging optical lens 30 of the third embodiment is within the first quadrant. According to FIG. 6, it can be seen that the imaging optical lens 30 of the third embodiment can achieve good imaging quality.

The following Table 19 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 ENPD of the imaging optical lens is 0.808mm, the full-field image height (diagonal direction) IH is 4.800mm, the x-direction image height is 3.840mm, and the y-direction image height is 2.880 mm, the imaging effect is best in this rectangular range. The diagonal FOV is 101.99°, the x-direction field-of-view angle is 89.14°, the y-direction field of view is 72.48°, wide-angle, ultra-thin, and its axis The 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 10 and Table 11 show design data of the imaging optical lens 40 of the fourth embodiment of the present application. Among them, the object side surface and the image side surface of the first lens L1 are free-form surfaces.

【Table 10】

Table 11 shows the aspheric surface data of each lens in the imaging optical lens 40 of the fourth embodiment of the present application.

【Table 11】

Table 12 shows free-form surface data in the imaging optical lens 40 of the fourth embodiment of the present application.

【Table 12】

FIG. 8 shows a situation where the RMS spot diameter of the imaging optical lens 40 of the fourth embodiment is within the first quadrant. According to FIG. 8, it can be seen that the imaging optical lens 40 of the fourth embodiment can achieve good imaging quality.

The following Table 19 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 ENPD of the imaging optical lens is 1.313mm, the full-field image height (diagonal direction) IH is 6.400mm, the image height in the x direction is 5.000mm, and the image height in the y direction is 4.000. mm, the imaging effect is the best in this rectangular range, the diagonal FOV is 89.47°, the x-direction field of view is 77.80°, the y-direction field of view is 66.75°, wide-angle, ultra-thin, and its axis The 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 13 and Table 14 show design data of the imaging optical lens 50 of the fifth embodiment of the present application. Among them, the object side surface and the image side surface of the fifth lens L5 are free-form surfaces.

【Table 13】

Table 14 shows the aspheric surface data of each lens in the imaging optical lens 50 of the fifth embodiment of the present application.

【Table 14】

Table 15 shows free-form surface data in the imaging optical lens 50 of the fifth embodiment of the present application.

【Table 15】

FIG. 10 shows a situation where the RMS spot diameter of the imaging optical lens 50 of the fifth embodiment is within the first quadrant. According to FIG. 10, it can be seen that the imaging optical lens 50 of the fifth embodiment can achieve good imaging quality.

The following Table 19 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 ENPD of the imaging optical lens is 1.366 mm, the full-field image height (diagonal direction) IH is 6.400 mm, the image height in the x direction is 5.000 mm, and the image height in the y direction is 4.000. mm, the imaging effect is the best in this rectangular range, the diagonal FOV is 87.43°, the x-direction field of view is 76.10°, the y-direction field of view is 65.04°, wide-angle, ultra-thin, and its axis The on-axis and off-axis chromatic aberrations are fully corrected, and they have excellent optical characteristics.

(Sixth Embodiment)

The sixth 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 16 and Table 17 show design data of the imaging optical lens 60 of the sixth embodiment of the present application. Among them, the object side surface and the image side surface of the second lens L2 are free-form surfaces.

【Table 16】

Table 17 shows the aspheric surface data of each lens in the imaging optical lens 60 of the sixth embodiment of the present application.

【Table 17】

Table 18 shows free-form surface data in the imaging optical lens 60 of the sixth embodiment of the present application.

【Table 18】

FIG. 12 shows a situation where the RMS spot diameter of the imaging optical lens 60 of the sixth embodiment is within the first quadrant. According to FIG. 12, it can be seen that the imaging optical lens 60 of the sixth embodiment can achieve good imaging quality.

The following Table 19 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 ENPD of the imaging optical lens is 1.300mm, the full-field image height (diagonal direction) IH is 6.400mm, the image height in the x direction is 5.000mm, and the image height in the y direction is 4.000. mm, the imaging effect is best in this rectangular range, the diagonal FOV is 90.06°, the x-direction field-of-view angle is 78.42°, the y-direction field of view is 67.44°, wide-angle, ultra-thin, and its axis The on-axis and off-axis chromatic aberrations are fully corrected, and they have excellent optical characteristics.

【Table 19】

Parameters and conditions	Example 1	Example 2	Example 3	Example 4	Example 5	Example 6
f1/f	5.72	5.57	5.25	2.19	2.26	2.24
f3/f4	-4.04	-3.56	-1.05	-4.52	-3.77	-5.36
f	1.955	1.955	1.955	2.953	3.074	2.925
f1	11.182	10.898	10.266	6.452	6.941	6.552
f2	2.846	2.755	2.707	4.059	4.015	4.093
f3	-4.176	-3.539	-4.344	-11.213	-9.413	-10.663
f4	1.033	0.993	4.149	2.483	2.500	1.988
f5	-1.127	-1.127	-96.229	-3.040	-3.025	-2.353
Fno	2.42	2.42	2.42	2.25	2.25	2.25

Those of ordinary skill in the art can understand that the above-mentioned embodiments are specific embodiments for realizing the present application, and in actual applications, various changes can be made in form and details without departing from the spirit and spirit of the present application. 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, and a fifth lens in sequence;

   At least one of the first lens to the fifth lens includes a free-form surface, the focal length of the imaging optical lens is f, the focal length of the first lens is f1, and the focal length of the third lens is f3, so The focal length of the fourth lens is f4, and satisfies the following relationship:

   2.00≤f1/f≤6.00;

   -5.50≤f3/f4≤-1.00.
2. The imaging optical lens of claim 1, wherein the on-axis thickness of the second lens is d3, and the on-axis distance from the image side surface of the second lens to the object side surface of the third lens is d4 , And satisfy the following relationship:

   2.00≤d3/d4≤8.00.
3. The imaging optical lens of claim 1, wherein the on-axis thickness of the fourth lens is d7, and the on-axis distance from the image side surface of the fourth lens to the object side surface of the fifth lens is d8 , And satisfy the following relationship:

   2.20≤d7/d8≤21.00.
4. The imaging optical lens of claim 1, wherein the curvature radius of the object side surface of the first lens is R1, the curvature radius of the image side surface of the first lens is R2, and the on-axis thickness of the first lens Is d1, the total optical length of the camera optical lens is TTL, and satisfies the following relationship:

   -6.47≤(R1+R2)/(R1-R2)≤8.76;

   0.03≤d1/TTL≤0.13.
5. The imaging optical lens according to claim 1, wherein the focal length of the second lens is f2, the radius of curvature of the object side of the second lens is R3, and the radius of curvature of the image side of the second lens is R4 , The axial thickness of the second lens is d3, the total optical length of the imaging optical lens is TTL, and the following relationship is satisfied:

   0.65≤f2/f≤2.18;

   0.23≤(R3+R4)/(R3-R4)≤1.97;

   0.04≤d3/TTL≤0.19.
6. The imaging optical lens of claim 1, wherein the curvature radius of the object side surface of the third lens is R5, the curvature radius of the image side surface of the third lens is R6, and the on-axis thickness of the third lens Is d5, the total optical length of the camera optical lens is TTL, and satisfies the following relationship:

   -7.59≤f3/f≤-1.21;

   -4.61≤(R5+R6)/(R5-R6)≤2.09;

   0.02≤d5/TTL≤0.09.
7. The imaging optical lens of claim 1, wherein the radius of curvature of the object side surface of the fourth lens is R7, the radius of curvature of the image side surface 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:

   0.25≤f4/f≤3.18;

   0.66≤(R7+R8)/(R7-R8)≤8.68;

   0.05≤d7/TTL≤0.31.
8. The imaging optical lens of claim 1, wherein the focal length of the fifth lens is f5, the radius of curvature of the object side of the fifth lens is R9, and the radius of curvature of the image side of the fifth lens is R10 , The axial thickness of the fifth lens is d9, the total optical length of the imaging optical lens is TTL, and the following relationship is satisfied:

   -98.44≤f5/f≤-0.38;

   0.70≤(R9+R10)/(R9-R10)≤12.48;

   0.05≤d9/TTL≤0.19.
9. The imaging optical lens of claim 1, wherein the aperture F number of the imaging optical lens is Fno, and the following relationship is satisfied:

   Fno≤2.49.
10. The imaging optical lens of claim 1, wherein the total optical length of the imaging optical lens is TTL, the diagonal full-field image height of the imaging optical lens is IH, and the following relationship is satisfied:

    TTL/IH≤0.88.

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