WO2021134330A1 - Camera optical lens - Google Patents

Abstract

A camera optical lens (10), which comprises in order from the object side to the image side: a first lens (L1) that has a negative refractive power, a second lens (L2) that has a positive refractive power, a third lens (L3) that has a positive refractive power, a fourth lens (L4) that has a negative refractive power, a fifth lens (L5) and a sixth lens (L6), wherein at least one of the first lens (L1) to the sixth lens (L6) has a free-form surface; the focal length of the camera optical lens (10) is f; the focal length of the first lens (L1) is f1; the focal length of the third lens (L3) is f3, and the following relationships are satisfied: 0.80≤f3/f≤1.40; and 3.00≤|f1/f|. The camera optical lens (10) meets the design requirements of having a wide angle and ultra-thinness while having a good optical performance.

Description

Camera optical lens Technical field

The present invention relates to the field of optical lenses, in particular to an imaging optical lens suitable for portable terminal equipment such as smart phones and digital cameras, as well as imaging devices such as monitors and PC lenses.

Background technique

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 object of the present invention is to provide an imaging optical lens, which has good optical performance, high resolution, wide angle, and good imaging quality.

In order to solve the above technical problems, an embodiment of the present invention provides an imaging optical lens. The imaging optical lens includes a first lens, a second lens, a third lens, and a fourth lens in order from the object side to the image side. , The fifth lens, the sixth lens;

At least one of the first lens to the sixth 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, the focal length of the third lens is f3, and Satisfy the following relationship: 0.80≤f3/f≤1.40; 3.00≤|f1/f|.

Preferably, the on-axis thickness of the fifth lens is d9, and the on-axis distance from the image side surface of the fifth lens to the object side surface of the sixth lens is d10, and the following relationship is satisfied: 1.00≤d9/d10 ≤30.00.

Preferably, the radius of curvature of the object side surface of the fourth lens is R7, and the radius of curvature of the image side surface of the fourth lens is R8, and the following relationship is satisfied: 3.00≤(R7+R8)/(R7-R8)≤8.00 .

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: -12.28≤(R1+R2)/(R1-R2)≤-1.42; 0.05≤d1/TTL≤0.16.

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: -119.42≤f2/f≤158.82; -117.13≤(R3+R4)/(R3-R4)≤30.53; 0.02≤d3/TTL≤ 0.08.

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: 0.22≤(R5+R6)/(R5-R6)≤1.08; 0.09≤d5/TTL≤0.27.

Preferably, the focal length of the fourth lens is f4, the axial thickness of the fourth lens is d7, the total optical length of the imaging optical lens is TTL, and the following relationship is satisfied: -16.90≤f4/f≤- 1.37; 0.02≤d7/TTL≤0.06.

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: 0.59≤f5/f≤2.17; 0.90≤(R9+R10)/(R9-R10)≤5.34; 0.06≤d9/TTL≤0.20.

Preferably, the focal length of the sixth lens is f6, the radius of curvature of the object side of the sixth lens is R11, the radius of curvature of the image side of the sixth lens is R12, and the on-axis thickness of the sixth lens is d11 , The total optical length of the camera optical lens is TTL, and satisfies the following relationship: -4.00≤f6/f≤-0.92; 1.76≤(R11+R12)/(R11-R12)≤6.06; 0.02≤d11/TTL≤ 0.10.

Preferably, the aperture F number of the imaging optical lens is FNO, and the following relational expression is satisfied: FNO≤2.27.

The beneficial effects of the present invention are that the imaging optical lens according to the present invention has good optical performance, high resolution, wide angle, and good imaging quality. It is especially suitable for high-pixel CCD, CMOS and other imaging elements. Mobile phone camera lens assembly and WEB camera lens.

Description of the drawings

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

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

Fig. 2 is a 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 invention;

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 invention;

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 invention;

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;

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

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

Detailed ways

In order to make the objectives, technical solutions and advantages of the present invention clearer, the various embodiments of the present invention will be described in detail below with reference to the accompanying drawings. However, a person of ordinary skill in the art can understand that, in each embodiment of the present invention, many technical details are proposed for the reader to better understand the present invention. However, even without these technical details and various changes and modifications based on the following embodiments, the technical solution claimed by the present invention can be realized.

(First embodiment)

With reference to the drawings, the present invention provides an imaging optical lens 10. FIG. 1 shows an imaging optical lens 10 according to a first embodiment of the present invention. The imaging optical lens 10 includes six lenses. Specifically, the imaging optical lens 10 includes in order from the object side to the image side: a first lens L1, a second lens L2, an aperture S1, a third lens L3, a fourth lens L4, a fifth lens L5, and a sixth lens. Lens L6. An optical element such as an optical filter GF may be provided between the sixth lens L6 and the image plane Si.

The first lens L1 has negative refractive power, the third lens L3 has positive refractive power, the fourth lens L4 has negative refractive power, the fifth lens L5 has positive refractive power, and the sixth lens L6 has negative refractive power.

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, and the sixth lens L6 is made of plastic material.

In this embodiment, it is defined that at least one of the first lens L1 to the sixth lens L6 includes a free-form surface, and the free-form surface helps correct aberrations such as astigmatism, curvature of field, and distortion of the wide-angle optical system.

The focal length of the imaging optical lens 10 is defined as f, and the focal length of the third lens L3 is f3, which satisfies the following relationship: 0.80≤f3/f≤1.40, which specifies the ratio of the focal length of the third lens to the total focal length. The range helps reduce aberrations and improve imaging quality. Preferably, 0.81≤f3/f≤1.39 is satisfied.

The focal length of the first lens L1 is defined as f1, which satisfies the following relationship: 3.00≤|f1/f|, when |f1/f| meets the condition, it helps to reduce the spherical aberration of the system and improve the imaging quality. Preferably, it satisfies 3.33≦|f1/f|.

The on-axis thickness of the fifth lens L5 is defined as d9, and the on-axis distance from the image side surface of the fifth lens L5 to the object side surface of the sixth lens L6 is d10, which satisfies the following relationship: 1.00≤d9/d10 ≤30.00, when d9/d10 meet the conditions, the total length of the system can be effectively compressed. Preferably, 1.56≤d9/d10≤29.69 is satisfied.

Define the radius of curvature of the object side surface of the fourth lens L4 as R7, and the radius of curvature of the image side surface of the fourth lens L4 as R8, satisfying the following relationship: 3.00≤(R7+R8)/(R7-R8)≤8.00, The shape of the fourth lens is specified, and the lens that meets the conditions is beneficial to reduce the degree of light deflection and the sensitivity of the lens. Preferably, it satisfies 3.19≤(R7+R8)/(R7-R8)≤7.81.

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: -12.28≤(R1+R2)/(R1-R2)≤- 1.42. Reasonably control the shape of the first lens L1 so that the first lens L1 can effectively correct the spherical aberration of the system. Preferably, it satisfies -7.68≤(R1+R2)/(R1-R2)≤-1.77.

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: 0.05≤d1/TTL≤0.16, which is beneficial to realize ultra-thinness. Preferably, 0.08≤d1/TTL≤0.13 is satisfied.

The focal length of the second lens L2 is defined as f2, and the focal length of the imaging optical lens 10 is f, which satisfies the following relationship: -119.42≤f2/f≤158.82, by controlling the optical power of the second lens L2 to be reasonable The range is conducive to correcting the aberration of the optical system. Preferably, -74.64≤f2/f≤127.05 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: -117.13≤(R3+R4)/(R3-R4)≤30.53, The shape of the second lens L2 is specified. When it is within the range, as the lens develops toward ultra-thin and wide-angle, it is beneficial to correct the problem of axial chromatic aberration. Preferably, it satisfies -73.21≤(R3+R4)/(R3- R4)≤24.42.

The on-axis thickness of the second lens L2 is d3, and the total optical length of the imaging optical lens 10 is TTL, which satisfies the following relationship: 0.02≤d3/TTL≤0.08, which is beneficial to achieve ultra-thinness. Preferably, 0.03≤d3/TTL≤0.06 is satisfied.

Define the curvature radius of the object side surface of the third lens L3 as R5, and the curvature radius of the image side surface of the third lens L3 as R6, which satisfies the following relationship: 0.22≤(R5+R6)/(R5-R6)≤1.08, which is effective Controlling the shape of the third lens L3 facilitates the molding of the third lens L3. Within the specified range of the conditional formula, the degree of deflection of the light passing through the lens can be eased, and aberrations can be effectively reduced. Preferably, 0.35≤(R5+R6)/(R5-R6)≤0.87 is satisfied.

The axial thickness of the third lens L3 is d5, and the total optical length of the imaging optical lens 10 is TTL, which satisfies the following relationship: 0.09≤d5/TTL≤0.27, which is conducive to achieving ultra-thinness. Preferably, 0.14≤d5/TTL≤0.22 is satisfied.

The focal length of the fourth lens is defined as f4, and the focal length of the imaging optical lens 10 is f, which satisfies the following relationship: -16.90≤f4/f≤-1.37. The reasonable distribution of optical power makes the system better High imaging quality and low sensitivity. Preferably, -10.56≤f4/f≤-1.72 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: 0.02≤d7/TTL≤0.06, which is beneficial to realize ultra-thinness. Preferably, 0.03≤d7/TTL≤0.04 is satisfied.

The focal length of the fifth lens L5 is defined as f5, the focal length of the imaging optical lens 10 is f, and the following relationship is satisfied: 0.59≤f5/f≤2.17. The limitation on the fifth lens L5 can effectively make the imaging lens The light angle is gentle, reducing tolerance sensitivity. Preferably, 0.95≤f5/f≤1.74 is satisfied.

The radius of curvature of the object side surface of the fifth lens is R9, and the radius of curvature of the image side surface of the fifth lens is R10, and the following relationship is satisfied: 0.90≤(R9+R10)/(R9-R10)≤5.34, which is specified When the shape of the fifth lens L5 is within the range, with the development of ultra-thin and wide-angle, it is beneficial to correct the aberration of the off-axis angle of view. Preferably, 1.44≤(R9+R10)/(R9-R10)≤4.27 is satisfied.

The axial thickness of the fifth lens L5 is d9, and the total optical length of the imaging optical lens 10 is TTL, which satisfies the following relationship: 0.06≤d9/TTL≤0.20, which is beneficial to realize ultra-thinness. Preferably, 0.09≤d9/TTL≤0.16 is satisfied.

The focal length of the sixth lens L6 is defined as f6, and the focal length of the imaging optical lens 10 is f, which satisfies the following relationship: -4.00≤f6/f≤-0.92. Through the reasonable distribution of optical power, the system has a relatively high Good imaging quality and low sensitivity. Preferably, it satisfies -2.50≤f6/f≤-1.16.

The radius of curvature of the object side surface of the sixth lens is R11, and the radius of curvature of the image side surface of the sixth lens is R12, which satisfies the following relationship: 1.76≤(R11+R12)/(R11-R12)≤6.06, which is When the shape of the sixth lens L6 is within the range of conditions, with the development of ultra-thin and wide-angle, it is beneficial to correct the aberration of the off-axis angle of view. Preferably, 2.81≤(R11+R12)/(R11-R12)≤4.85 is satisfied.

The axial thickness of the sixth lens L6 is d11, and the total optical length of the imaging optical lens 10 is TTL, which satisfies the following relationship: 0.02≦d11/TTL≦0.10, which is beneficial to realize ultra-thinness. Preferably, 0.04≤d11/TTL≤0.08 is satisfied.

In this embodiment, the aperture F number of the imaging optical lens 10 is FNO, and satisfies the following relationship: FNO≤2.27, large aperture, good imaging performance. Preferably, FNO≤2.22.

In this embodiment, the total optical length TTL of the imaging optical lens 10 is less than or equal to 7.05 mm, which is beneficial to realize ultra-thinness. Preferably, the total optical length TTL is less than or equal to 6.73 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 invention 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 according to the first embodiment of the present invention. 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 surface of the sixth lens L6;

R12: the radius of curvature of the image side surface of the sixth lens L6;

d: the on-axis thickness of the lens and the on-axis distance between the lenses;

d0: the on-axis distance from the aperture S1 to the object side of the first lens L1;

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

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

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

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

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

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

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

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

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

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

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

d12: the on-axis distance from the image side surface of the sixth lens L6 to the object side surface of the optical filter GF;

d13: the axial thickness of the optical filter GF;

d14: the on-axis distance from the image side surface of the optical filter GF to the image surface;

nd: refractive index of d-line;

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

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

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

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

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

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

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;

vg: Abbe number of optical filter GF.

Table 2 shows the aspheric 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 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 (the distance from the aspherical surface to the optical axis is The vertical distance between the point of r and the tangent plane tangent to the vertex on the optical axis of the aspherical surface).

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 (1)

For convenience, the aspheric surface of each lens surface uses the aspheric surface shown in the above formula (1). However, the present invention is not limited to the aspheric polynomial form represented by the formula (1).

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

【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, the present invention 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 16 shows the values corresponding to the various values in each of Examples 1, 2, 3, 4, and 5 and the parameters that have been specified in the conditional expressions.

As shown in Table 16, the first embodiment satisfies various conditional expressions.

In this embodiment, the entrance pupil diameter ENPD of the imaging optical lens is 0.956mm, the full-field image height (diagonal direction) IH is 6.720mm, the image height in the x direction is 5.376mm, and the image height in the y direction is 4.032. mm, the imaging effect is best in this rectangular range. The diagonal FOV is 118.47°, the x-direction is 106.70°, and the y-direction is 90.46°, 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 design data of the imaging optical lens 20 according to the second embodiment of the present invention.

【Table 4】

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

【table 5】

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

【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 16, the second embodiment satisfies various conditional expressions.

In this embodiment, the entrance pupil diameter ENPD of the imaging optical lens is 1.1085mm, the full-field image height (diagonal direction) IH is 7.580mm, the image height in the x direction is 6.064mm, and the image height in the y direction is 4.548. mm, the imaging effect is best in this rectangular range, the diagonal FOV is 118.47°, the x-direction is 106.70°, the y-direction is 90.46°, wide-angle, ultra-thin, The on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.

(Third embodiment)

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

Tables 7 and 8 show design data of the imaging optical lens 30 according to the third embodiment of the present invention.

【Table 7】

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

【Table 8】

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

【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 16 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 0.987mm, the full-field image height (diagonal direction) IH is 7.140mm, the image height in the x direction is 5.712mm, and the image height in the y direction is 4.284. mm, the imaging effect is best in this rectangular range, the diagonal FOV is 118.47°, the x-direction is 106.70°, the y-direction is 90.46°, wide-angle, ultra-thin, The on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.

(Fourth embodiment)

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

Table 10 and Table 11 show design data of the imaging optical lens 40 according to the fourth embodiment of the present invention. Among them, the object side surface and the image side surface of the second lens L2 are free-form surfaces.

【Table 10】

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

【Table 11】

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

【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 16 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 0.9466mm, the full-field image height (diagonal direction) IH is 6.720mm, the image height in the x direction is 5.376mm, and the image height in the y direction is 4.032. mm, the imaging effect is best in this rectangular range, the diagonal FOV is 118.78°, the x-direction is 107.03°, the y-direction is 90.80°, wide-angle, ultra-thin, The on-axis and off-axis chromatic aberrations are fully corrected, and it has 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 invention. Among them, the object side surface and the image side surface of the third lens L3 are free-form surfaces.

【Table 13】

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

【Table 14】

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

【Table 15】

FIG. 10 shows a situation where the RMS spot diameter of the imaging optical lens 50 of the fourth 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 16 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 0.949mm, the full-field image height (diagonal direction) IH is 6.700mm, the image height in the x direction is 5.360mm, and the image height in the y direction is 4.020. mm, the imaging effect is best in this rectangular range, the diagonal FOV is 118.47°, the x-direction is 106.70°, the y-direction is 90.46°, wide-angle, ultra-thin, The on-axis and off-axis chromatic aberrations are fully corrected, and it has excellent optical characteristics.

【Table 16】

Parameters and conditions	Example 1	Example 2	Example 3	Example 4	Example 5
f3/f	0.97	0.81	1.37	0.95	0.94
|f1/f|	4.69	3.66	9.00	5.45	5.75
f	2.007	2.328	2.172	1.988	1.993
f1	-9.410	-8.516	-19.542	-10.829	-11.457
f2	-119.835	-116.090	-52.052	105.931	211.027
f3	1.954	1.886	2.976	1.891	1.882
f4	-5.933	-4.792	-18.354	-5.431	-5.544
f5	2.658	2.775	2.572	2.878	2.810
f6	-3.372	-3.228	-3.192	-3.980	-3.811
Fno	2.10	2.10	2.20	2.10	2.10

Among them, Fno is the aperture F number of the imaging optical lens.

A person of ordinary skill in the art can understand that the above-mentioned embodiments are specific embodiments for realizing the present invention, and in practical applications, various changes can be made to them in form and details without departing from the spirit and spirit of the present invention. range.

Claims (10)

1. An imaging optical lens, characterized in that the imaging optical lens, from the object side to the image side, sequentially includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a sixth lens;

   At least one of the first lens to the sixth 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, the focal length of the third lens is f3, and Satisfy the following relations:

   0.80≤f3/f≤1.40;

   3.00≤|f1/f|.
2. The imaging optical lens of claim 1, wherein the on-axis thickness of the fifth lens is d9, and the on-axis distance from the image side surface of the fifth lens to the object side surface of the sixth lens is d10 , And satisfy the following relationship:

   1.00≤d9/d10≤30.00.
3. The imaging optical lens of claim 1, wherein the radius of curvature of the object side of the fourth lens is R7, and the radius of curvature of the image side of the fourth lens is R8, and the following relationship is satisfied:

   3.00≤(R7+R8)/(R7-R8)≤8.00.
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:

   -12.28≤(R1+R2)/(R1-R2)≤-1.42;

   0.05≤d1/TTL≤0.16.
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:

   -119.42≤f2/f≤158.82;

   -117.13≤(R3+R4)/(R3-R4)≤30.53;

   0.02≤d3/TTL≤0.08.
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:

   0.22≤(R5+R6)/(R5-R6)≤1.08;

   0.09≤d5/TTL≤0.27.
7. The imaging optical lens of claim 1, wherein the focal length of the fourth lens is f4, 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:

   -16.90≤f4/f≤-1.37;

   0.02≤d7/TTL≤0.06.
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:

   0.59≤f5/f≤2.17;

   0.90≤(R9+R10)/(R9-R10)≤5.34;

   0.06≤d9/TTL≤0.20.
9. The imaging optical lens of claim 1, wherein the focal length of the sixth lens is f6, the radius of curvature of the object side of the sixth lens is R11, and the radius of curvature of the image side of the sixth lens is R12 , The on-axis thickness of the sixth lens is d11, the total optical length of the imaging optical lens is TTL, and the following relationship is satisfied:

   -4.00≤f6/f≤-0.92;

   1.76≤(R11+R12)/(R11-R12)≤6.06;

   0.02≤d11/TTL≤0.10.
10. The imaging optical lens according to claim 1, wherein the aperture F number of the imaging optical lens is FNO, and the following relationship is satisfied:

    FNO≤2.27.

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