TWI792749B - Optical imaging lens, imaging device, and electronic device - Google Patents

Abstract

An optical imaging lens includes, from an object side to an image side, a first lens having negative refractive power and including an object-side surface being convex and an image-side surface being concave, a second lens having negative refractive power and including an image-side surface being concave, a third lens having refractive power and including an object-side surface being concave and an image-side surface being convex, a fourth lens having positive refractive power and including an object-side surface being convex and an image-side surface being concave, an aperture, a fifth lens having positive refractive power and including an object-side surface being convex and an image-side surface being convex, a sixth lens having negative refractive power and including an object-side surface being concave and an image-side surface being convex, and a seventh lens having positive refractive power and including an object-side surface being convex. The optical imaging lens includes a total of seven elements.

Description

Optical imaging lens group, imaging device and electronic device

The present invention relates to an optical imaging lens group and an imaging device, in particular to an optical imaging lens group, an imaging device and an electronic device suitable for a vehicle photographic electronic device or a monitoring photographic system.

As the semiconductor process technology continues to improve, the pixel size of the image sensing element can reach a smaller size, and the performance is significantly improved. Therefore, the optical lens with high imaging quality has become an indispensable part of the electronic camera device.

With the diversified development of electronic camera devices, their application scope is becoming more and more extensive, such as advanced driver assistance systems (ADAS), driving recorders, home surveillance camera equipment, smart phones and human-computer interaction devices, etc., the design of optical lenses Requirements are also more diverse. As far as the vehicle camera is concerned, in order to clearly identify obstacles around the vehicle or approaching vehicles on both sides, it is necessary to improve the resolution and brightness of the optical lens, and at the same time require a high degree of adaptability to the ambient temperature. In addition, in order to properly correct various aberrations, especially for distance measurement or object recognition purposes, if there is a large distortion aberration in the captured image, errors will easily occur when calculating distance or image recognition.

Therefore, how to design an optical imaging device to achieve a balance between miniaturization, high resolution, and good optical imaging quality has become a goal that people in this technical field are striving for.

Therefore, in order to solve the above-mentioned problems, the present invention provides an optical imaging lens group, which sequentially includes a first lens, a second lens, a third lens, a fourth lens, a diaphragm, a fifth lens, and a first lens from the object side to the image side. Six lenses and a seventh lens. Among them, the first lens has negative refractive power, its object side is convex, and its image side is concave; the second lens has negative refractive power, its image side is concave; the third lens has refractive power, its object side is concave, and its image side is concave. It is a convex surface; the fourth lens has positive refractive power, its object side is convex, and its image side is concave; the fifth lens has positive refractive power, its object side is convex, and its image side is convex; the sixth lens has negative refractive power, its The object side is concave, and the image side is convex; wherein, the fifth lens and the sixth lens constitute a cemented lens; the seventh lens has positive refractive power, and the object side is convex; the total number of lenses in the optical imaging lens group is Seven lenses; wherein, the combined focal length of the fifth lens and the sixth lens is f56, and the effective focal length of the optical imaging lens group is EFL, which satisfies the following relationship: 1.7<f56/EFL<6.

According to an embodiment of the present invention, the focal length of the first lens is f1, the focal length of the second lens is f2, and the focal length of the seventh lens is f7, which satisfy the following relationship: f7>|f1|>|f2|.

The present invention further provides an optical imaging lens group, which sequentially includes a first lens, a second lens, a third lens, a fourth lens, a diaphragm, a fifth lens, a sixth lens and a seventh lens from the object side to the image side. Among them, the first lens has negative refractive power, its object side is convex, and its image side is concave; the second lens has negative refractive power, its image side is concave; the third lens has refractive power, its object side is concave, and its image side is concave. The side is convex; the fourth lens has positive refractive power, its object side is convex, and the image side is concave; the fifth lens has positive refractive power, its object side is convex, and the image side is convex; the sixth lens has negative refractive power, The object side is concave, and the image side is convex; wherein, the fifth lens and the sixth lens constitute a cemented lens; the seventh lens has positive refractive power, and the object side is convex; the total number of lenses in the optical imaging lens group is Seven lenses; wherein, the focal length of the first lens is f1, the focal length of the second lens is f2, and the focal length of the seventh lens is f7, which satisfy the following relationship: f7>|f1|>|f2|.

According to an embodiment of the present invention, the radius of curvature of the object side of the first lens is R1, and the effective focal length of the overall optical imaging lens group is EFL, which satisfy the following relationship: 5<R1/EFL<9.

According to an embodiment of the present invention, the focal length of the fourth lens is f4, and the effective focal length of the optical imaging lens group is EFL, which satisfies the following relationship: 3<f4/EFL<8.

According to an embodiment of the present invention, the focal length of the first lens is f1, and the focal length of the second lens is f2, which satisfy the following relationship: 1<f1/f2<2.5.

According to an embodiment of the present invention, the radius of curvature of the object side of the third lens is R5, and the radius of curvature of the image side is R6, which satisfy the following relationship: 6<(R5+R6)/(R6-R5)<14 .

According to an embodiment of the present invention, the radius of curvature of the object side of the fourth lens is R7, and the radius of curvature of the image side is R8, which satisfy the following relationship: 4<(R7+R8)/(R8-R7)<8 .

According to an embodiment of the present invention, the combined focal length of the fifth lens, the sixth lens, and the seventh lens is f567, and the effective focal length of the overall optical imaging lens group is EFL, which satisfies the following relationship: 1.5<f567/EFL <3.5.

According to an embodiment of the present invention, the focal length of the third lens is f3, and the effective focal length of the overall optical imaging lens group is EFL, which satisfies the following relationship: |f3|/EFL>20.

According to an embodiment of the present invention, the focal length of the fifth lens is f5, and the effective focal length of the overall optical imaging lens group is EFL, which satisfies the following relationship: 0.8<f5/EFL<1.4.

According to an embodiment of the present invention, the focal length of the seventh lens is f7, and the effective focal length of the overall optical imaging lens group is EFL, which satisfies the following relationship: 4<f7/EFL<9.

According to an embodiment of the present invention, the fifth lens has a refractive index of Nd5 and a dispersion coefficient of Vd5, the sixth lens has a refractive index of Nd6 and a dispersion coefficient of Vd6, and the effective focal length of the overall optical imaging lens group is EFL, The following relations are satisfied: Nd5<Nd6; and Vd5>Vd6.

According to an embodiment of the present invention, the radius of curvature of the image side of the sixth lens is R12, and the radius of curvature of the object side of the seventh lens is R13, which satisfy the following relationship: -2.5<R12/R13<-0.3.

According to an embodiment of the present invention, the distance between the image side of the sixth lens and the object side of the seventh lens on the optical axis is AT67, and the effective focal length of the overall optical imaging lens group is EFL, which satisfies the following relationship: 0.4< AT67/EFL<2.3.

The present invention further provides an imaging device, which includes the aforementioned optical imaging lens group, and an image sensing element, wherein the image sensing element is disposed on the imaging surface of the optical imaging lens group.

The present invention further provides an electronic device, which includes the aforementioned imaging device.

In the following embodiments, the optical imaging lens group includes a plurality of lenses, and the material of each lens can be glass or plastic, and is not limited to the materials listed in the embodiments. When the lens material is glass, the lens surface can be processed by grinding or molding, and because the glass material itself is resistant to temperature changes and high hardness, it can reduce the impact of environmental changes on the optical imaging lens group, thereby prolonging the optical imaging. The service life of the lens group. When the lens material is plastic, it is beneficial to reduce the weight of the optical imaging lens group and reduce the production cost.

In an embodiment of the present invention, each lens includes an object side facing the subject and an image side facing the imaging plane. The surface shape of each lens is defined according to the shape of the surface near the optical axis (paraxial). For example, when describing the object side of a lens as a convex surface, it means that the object side of the lens near the optical axis is convex. , that is, although the lens surface is described as convex in the embodiments, the surface may be convex or concave in a region away from the optical axis (off-axis). The shape of each lens near the axis is judged by the curvature radius of the surface is positive or negative. For example, if the curvature radius of the object side of a lens is positive, then the object side is convex; If the radius of curvature is negative, the side of the object is concave. As far as the image side of a lens is concerned, if the radius of curvature is positive, the image side is concave; on the contrary, if the radius of curvature is negative, the image side is convex.

In an embodiment of the present invention, the object side and the image side of each lens may be spherical or aspheric surfaces. Using an aspheric surface on the lens helps to correct the imaging aberrations of the optical imaging lens group such as spherical aberration, and reduces the number of optical lens elements used. However, the use of aspheric lenses will increase the cost of the overall optical imaging lens group. Although in the embodiments of the present invention, some optical lenses use spherical surfaces, they can still be designed as aspheric surfaces as required; or, some optical lenses use aspheric surfaces, but they can still be designed as aspheric surfaces as required. Design it as a spherical surface.

In an embodiment of the present invention, the total track length (TTL) of the optical imaging lens group is defined as the distance on the optical axis from the object side to the imaging plane of the first lens of the optical imaging lens group. The imaging height of this optical imaging lens group is called the maximum image height ImgH (Image Height); when an image sensing element is set on the imaging surface, the maximum image height ImgH represents the diagonal length of the effective sensing area of the image sensing element one half. In the following embodiments, the units of the radius of curvature, lens thickness, distance between lenses, total lens group length TTL, maximum image height ImgH, and focal length (Focal Length) of all lenses are expressed in millimeters (mm).

The present invention provides an optical imaging lens group, which sequentially includes a first lens, a second lens, a third lens, a fourth lens, a diaphragm, a fifth lens, a sixth lens and a seventh lens from the object side to the image side. Among them, the first lens has negative refraction power, and its object side is convex, and the image side is concave; the second lens has negative refraction power, and its image side is concave; the third lens has refraction power, and its object side is concave, and the image side is concave. is convex; the fourth lens has positive refractive power, its object side is convex, and the image side is concave; the fifth lens has positive refractive power, its object side is convex, and the image side is convex; and the sixth lens has negative refractive power, The object side is concave and the image side is convex, wherein the fifth lens and the sixth lens form a cemented lens; the seventh lens has positive refractive power, and the object side is convex; the lens group of this optical imaging lens group The number is seven pieces.

Both the first lens and the second lens have negative refractive power, so that the negative refractive power at the front end of the optical imaging lens group can be properly distributed to the first lens and the second lens, wherein the object side of the first lens is a convex surface, and the image side is convex. It is a concave surface, and the image side of the second lens is a concave surface, which helps to improve the light collection range of the optical imaging lens group and expand the imaging angle of view.

The third lens has positive or negative refractive power, and its object side is concave and its image side is convex, which can further adjust the traveling direction of the light so that the incident light is closer to the optical axis to reduce imaging aberration.

The fourth lens has positive refractive power, its object side is convex, and its image side is concave. The object side of the fourth lens is opposite to the convex surface of the image side of the third lens, which helps to correct field curvature aberration.

The fifth lens has positive refractive power, its object side is convex, and its image side is convex. The aperture is disposed between the fourth lens and the fifth lens, which helps to correct distortion aberration. The sixth lens has a negative refractive power, its object side is concave, and its image side is convex; the image side of the fifth lens and the object side of the sixth lens are bonded to each other to form a cemented lens, which is beneficial to correct chromatic aberration and spherical aberration .

The seventh lens has positive refractive power, and its object side is convex, opposite to the image side convex of the sixth lens, which helps to correct aberrations.

The combined focal length of the fifth lens and the sixth lens of the optical imaging lens group is f56, and the effective focal length of the overall optical imaging lens group is EFL, which satisfies the following relationship:

1.7<f56/EFL<6 (1);

By satisfying the condition of relational expression (1), it is helpful to form a symmetrical positive refractive power lens structure on both sides of the aperture, which is helpful to correct field curvature aberration. If f56/EFL is lower than the lower limit of relational expression (1), the combined refractive power of the fifth lens and the sixth lens will be larger, which will easily shorten the back focal length of the optical imaging lens group, and the field curvature aberration will not be easy Correction; if f56/EFL is higher than the upper limit of relational formula (1), the combined refractive power of the fifth lens and the sixth lens will be small, increasing the positive refractive power burden of the seventh lens, which is not conducive to correcting spherical aberration .

The focal length of the first lens of the optical imaging lens group is f1, the focal length of the second lens is f2, and the focal length of the seventh lens is f7, which satisfy the following relationship:

f7＞|f1|＞|f2| (2);

By satisfying the condition of relational expression (2), the refractive power of the first lens, the second lens and the seventh lens can be controlled, which is beneficial to form an optical lens group structure with a wide viewing angle.

The focal length of the fourth lens of the optical imaging lens group is f4, and the effective focal length of the overall optical imaging lens group is EFL, which satisfies the following relationship:

3<f4/EFL<8 (3);

By satisfying the condition of the relational expression (3), the fourth lens element can have an appropriate positive refractive power as the main element for adjusting the optical path. If f4/EFL is lower than the lower limit value of relation (3), the positive refractive power of the fourth lens is relatively large, which will easily shorten the imaging distance at the rear end of the optical imaging lens group and affect the configuration of the optical lens group at the rear end of the aperture; if If f4/EFL is higher than the upper limit value of relation (3), the positive refractive power of the fourth lens is small, and the total length of the optical imaging lens group is likely to be increased, which is not conducive to miniaturization.

The radius of curvature of the first lens object side of the optical imaging lens group is R1, and the effective focal length of the overall optical imaging lens group is EFL, which satisfies the following relationship:

5<R1/EFL<9 (4);

By satisfying the condition of relational expression (4), the radius of curvature R1 of the object side surface of the first lens can be controlled to expand the light-collecting range of the optical imaging lens group and improve the imaging angle of view.

The focal length of the first lens of the described optical imaging lens group is f1, and the focal length of the second lens is f2, which satisfy the following relationship:

1<f1/f2<2.5 (5);

By satisfying the condition of relation (5), it is possible to maintain an appropriate ratio between the focal length of the first lens and the focal length of the second lens, which is beneficial to guide the incident light with a wide viewing angle to pass through the first lens and the second lens. The second lens adjusts the traveling direction of the incident light.

The radius of curvature of the third lens object side of the optical imaging lens group is R5, and the radius of curvature of the image side is R6, which satisfy the following relationship:

6<(R5+R6)/(R6-R5)<14 (6);

By satisfying the condition of relational expression (6), the third lens can have an appropriate lens shape, which is beneficial for correcting imaging aberration.

The radius of curvature of the fourth lens object side of the optical imaging lens group is R7, and the radius of curvature of the image side is R8, which satisfy the following relationship:

4<(R7+R8)/(R8-R7)<8 (7);

By satisfying the condition of relational expression (7), the fourth lens can have an appropriate lens shape, which is beneficial to correct imaging aberration.

The combined focal length of the fifth lens, the sixth lens and the seventh lens of the optical imaging lens group is f567, and the effective focal length of the overall optical imaging lens group is EFL, which satisfies the following relationship:

1.5<f567/EFL<3.5 (8);

By satisfying the condition of relational expression (8), the combined focal length of the fifth lens, the sixth lens and the seventh lens can have an appropriate positive refractive power, which is beneficial to the miniaturization of the optical imaging lens group.

The focal length of the third lens of the optical imaging lens group is f3, and the effective focal length of the overall optical imaging lens group is EFL, which satisfies the following relationship:

|f3|/EFL＞20 (9);

By satisfying the condition of the relational expression (9), the third lens can have a weaker negative or positive refractive power, so that the main function of the third lens is to correct aberrations.

The focal length of the fifth lens of the optical imaging lens group is f5, and the effective focal length of the overall optical imaging lens group is EFL, which satisfies the following relationship:

0.8<f5/EFL<1.4 (10);

By satisfying the condition of the relational expression (10), the fifth lens arranged behind the aperture can have an appropriate positive refractive power, which is helpful for converging light and controlling the size of the optical lens.

The focal length of the seventh lens of the optical imaging lens group is f7, and the effective focal length of the overall optical imaging lens group is EFL, which satisfies the following relationship:

4<f7/EFL<9 (11);

By satisfying the condition of relational expression (11), an appropriate ratio between the focal length of the seventh lens and the effective focal length EFL of the overall optical imaging lens group can be maintained, which is beneficial to correct field curvature aberration and spherical aberration.

The fifth lens of the optical imaging lens group has a refractive index of Nd5 and a dispersion coefficient of Vd5, the sixth lens has a refractive index of Nd6 and a dispersion coefficient of Vd6, and the effective focal length of the overall optical imaging lens group is EFL, which satisfies The following relationship:

Nd5<Nd6 (12); and

Vd5>Vd6 (13);

By satisfying the conditions of relational expressions (12) and (13), it is beneficial to correct the chromatic aberration of the optical imaging lens group.

The radius of curvature of the sixth lens image side of the optical imaging lens group is R12, and the radius of curvature of the object side of the seventh lens is R13, which satisfy the following relationship:

-2.5<R12/R13<-0.3 (14);

By satisfying the condition of relation (14), the convex shapes of the image side of the sixth lens and the object side of the seventh lens can be controlled to correct imaging aberration.

The distance between the sixth lens image side and the seventh lens object side of the optical imaging lens group on the optical axis is AT67, and the effective focal length of the overall optical imaging lens group is EFL, which satisfies the following relationship:

0.4<AT67/EFL<2.3 (15);

By satisfying the condition of relational expression (15), there can be an appropriate air gap between the sixth lens and the seventh lens, which is beneficial to correct imaging aberration. first embodiment

Referring to FIG. 1A and FIG. 1B , FIG. 1A is a schematic diagram of an optical imaging lens group according to a first embodiment of the present invention. Fig. 1B is, from left to right, the diagram of Longitudinal Spherical Aberration, Astigmatism/Field Curvature and Distortion of the first embodiment of the present invention.

As shown in FIG. 1A, the optical imaging lens group 10 of the first embodiment includes a first lens 11, a second lens 12, a third lens 13, a fourth lens 14, a diaphragm ST, and a second lens in sequence from the object side to the image side. Fifth lens 15 , sixth lens 16 and seventh lens 17 . The optical imaging lens set 10 can further include a filter element 18 , a protective glass 19 and an imaging surface 100 . An image sensing element 110 can be further disposed on the imaging surface 100 to form an imaging device (not labeled otherwise).

The first lens 11 has a negative refractive power, its object side 11 a is convex, its image side 11 b is concave, and both its object side 11 a and image side 11 b are spherical. The material of the first lens 11 is glass.

The second lens 12 has a negative refractive power. The object side 12a is convex, the image side 12b is concave, and both the object side 12a and the image side 12b are spherical. The material of the second lens 12 is glass.

The third lens 13 has negative refractive power, the object side 13 a is concave, the image side 13 b is convex, and both the object side 13 a and the image side 13 b are aspherical. The material of the third lens 13 is plastic.

The fourth lens 14 has positive refractive power, its object side 14 a is convex, its image side 14 b is concave, and its object side 14 a and image side 14 b are both aspherical. The material of the fourth lens 14 is glass.

The fifth lens 15 has a positive refractive power, its object side 15 a is convex, its image side 15 b is convex, and both its object side 15 a and image side 15 b are spherical. The fifth lens 15 is made of glass.

The sixth lens 16 has negative refractive power, its object side 16 a is concave, its image side 16 b is convex, and its object side 16 a and image side 16 b are both spherical. The material of the sixth lens 16 is glass. Wherein, the image side 15b of the fifth lens 15 and the object side 16a of the sixth lens 16 have the same curvature radius, and are bonded together to form a cemented lens.

The seventh lens 17 has positive refractive power, its object side 17a is convex, its image side 17b is concave, and its object side 17a and image side 17b are spherical. The material of the seventh lens 17 is glass.

The filter element 18 is disposed between the seventh lens 17 and the imaging surface 100 to filter out light in a specific wavelength range, such as an infrared filter (IR Filter). The two surfaces 18a, 18b of the filter element 18 are both flat and made of glass.

The protective glass 19 is disposed on the image sensing element 110 , and its two surfaces 19 a , 19 b are both flat and made of glass.

The image sensor (Image Sensor) 110 is, for example, a Charge-Coupled Device (CCD) Image Sensor or a Complementary Metal Oxide Semiconductor Sensor (CMOS Image Sensor).

The curve equations of the above-mentioned aspheric surfaces are expressed as follows:

Among them, X: the distance between the point on the aspheric surface whose distance from the optical axis is Y and the tangent plane of the aspheric surface on the optical axis;

Y: The vertical distance between the point on the aspheric surface and the optical axis;

R: radius of curvature of the lens at the near optical axis;

K: cone coefficient; and

Ai: i-th order aspherical coefficient.

Please refer to Table 1 below, which is the detailed optical data of the optical imaging lens group 10 according to the first embodiment of the present invention. Wherein, the object side 11a of the first lens 11 is marked as the surface 11a, and the image side 11b is marked as the surface 11b, and the other lens surfaces are deduced accordingly. The value in the distance column in the table represents the distance from the surface to the next surface on the optical axis I, for example, the distance from the object side 11a to the image side 11b of the first lens 11 is 0.5 mm, which means that the first lens 11 is on the optical axis The thickness is 0.5 mm. The distance from the image side 11b of the first lens 11 to the object side 12a of the second lens 12 is 2.124 mm. Others can be deduced in a similar manner, and will not be repeated below.

In the first embodiment, the effective focal length of the optical imaging lens group 10 is EFL, the aperture value (F-number) is Fno, half of the maximum viewing angle of the overall optical imaging lens group 10 is HFOV (Half Field of View), the first The distance from the object side 11a of the lens 11 to the imaging surface 100 on the optical axis I is the total length TTL, and its values are as follows: EFL=2.34 mm, Fno=2.44, TTL=21.18 mm, HFOV=105 degrees. The tables of the following embodiments are corresponding to the optical imaging lens groups of each embodiment, and the definitions of each table are the same as those of this embodiment, so they will not be repeated in the following embodiments. first embodiment EFL= 2.34 mm, Fno = 2.44, HFOV = 105 deg surface surface type Radius of curvature (mm) Distance (mm) Refractive index Dispersion coefficient focal length(mm) material subject unlimited unlimited first lens 11a sphere 17.221 0.500 1.859 40.4 -9.67 Glass 11b sphere 5.526 2.124 second lens 12a sphere 13.222 0.450 1.746 49.3 -6.85 Glass 12b sphere 3.635 3.711 third lens 13a Aspherical -2.783 1.473 1.668 20.4 -53.94 plastic 13b Aspherical -3.656 0.100 fourth lens 14a Aspherical 3.070 2.231 1.694 31.0 9.10 Glass 14b Aspherical 4.195 1.268 aperture ST flat unlimited 0.000 fifth lens 15a sphere 6.400 2.246 1.761 47.8 2.59 Glass 15b (glued side) sphere -2.410 0.000 sixth lens 16a (glued side) sphere -2.410 1.028 1.957 17.9 -3.73 Glass 16b sphere -8.986 2.542 seventh lens 17a sphere 6.853 1.255 1.615 60.6 14.40 Glass 17b sphere 28.151 0.397 filter element 18a flat unlimited 0.210 1.517 64.2 Glass 18b flat unlimited 1.114 protective glass 19a flat unlimited 0.400 1.517 64.2 Glass 19b flat unlimited 0.130 imaging surface 100 flat unlimited Reference wavelength: 550 nm Table I

Please refer to Table 2 below, which shows the aspheric coefficients of the surfaces of the third lens 13 and the fourth lens 14 in the first embodiment of the present invention. Among them, K is the cone coefficient in the aspheric curve equation, and A ₂ to A ₁₄ represent the 2nd to 14th order aspheric coefficients of each surface. For example, the conic coefficient K of the object side surface 13a of the third lens 13 is -0.581. Others can be deduced in a similar manner, and will not be repeated below. In addition, the tables of the following embodiments are corresponding to the optical imaging lens groups of each embodiment, and the definitions of each table are the same as those of this embodiment, so they will not be repeated in the following embodiments. Aspheric coefficient of the first embodiment surface 13a 13b 14a 14b K -5.81E-01 -1.35E+00 2.28E-01 3.83E+00 A ₂ 0.00E+00 0.00E+00 0.00E+00 0.00E+00 A ₄ 1.62E-03 2.66E-04 -7.45E-05 -2.17E-03 A ₆ 1.54E-04 -4.05E-05 1.41E-06 1.72E-03 A ₈ 3.62E-06 8.69E-06 -7.47E-06 -5.46E-04 A ₁₀ 1.02E-07 -1.81E-07 3.72E-07 1.16E-04 A ₁₂ 3.01E-22 -2.65E-22 -1.86E-24 1.66E-25 A ₁₄ -3.09E-28 -7.77E-28 0.00E+00 0.00E+00 Table II

In the first embodiment, the relationship between the combined focal length f56 of the fifth lens 15 and the sixth lens 16 and the effective focal length EFL of the overall optical imaging lens group 10 is f56/EFL=3.12.

In the first embodiment, the focal length f1 of the first lens 11 , the focal length f2 of the second lens 12 and the focal length of the seventh lens 17 are respectively |f1|=9.67, |f2|=6.85, and f7=14.40.

In the first embodiment, the relationship between the focal length f4 of the fourth lens 14 and the effective focal length EFL of the overall optical imaging lens group 10 is f4/EFL=3.89.

In the first embodiment, the relationship between the curvature radius R1 of the object side surface 11a of the first lens 11 and the effective focal length EFL of the overall optical imaging lens group 10 is R1/EFL=7.36.

In the first embodiment, the relationship between the focal length f1 of the first lens 11 and the focal length f2 of the second lens 12 is f1/f2=1.41.

In the first embodiment, the relationship between the radius of curvature R5 of the object side 13a of the third lens 13 and the radius of curvature R6 of the image side 13b is (R5+R6)/(R6-R5)=7.38.

In the first embodiment, the relationship between the radius of curvature R7 of the object side 14a of the fourth lens 14 and the radius of curvature R8 of the image side 14b is (R7+R8)/(R8-R7)=6.46.

In the first embodiment, the relationship between the combined focal length f567 of the fifth lens 15, the sixth lens 16 and the seventh lens 17 and the effective focal length EFL of the overall optical imaging lens group 10 is f567/EFL=2.48 .

In the first embodiment, the relationship between the focal length f3 of the third lens 13 and the effective focal length EFL of the overall optical imaging lens group 10 is |f3|/EFL=23.05.

In the first embodiment, the relationship between the focal length f5 of the fifth lens 15 and the effective focal length EFL of the overall optical imaging lens group 10 is f5/EFL=1.11.

In the first embodiment, the relationship between the focal length f7 of the seventh lens 17 and the effective focal length EFL of the overall optical imaging lens group 10 is f7/EFL=6.15.

In the first embodiment, the refractive index Nd5 and dispersion coefficient Vd5 of the fifth lens 15, and the refractive index Nd6 and dispersion coefficient Vd6 of the sixth lens 16 are respectively Nd5=1.761, Vd5=47.8; Nd6=1.957, Vd6 =17.9.

In the first embodiment, the relationship between the radius of curvature R12 of the image side 16b of the sixth lens 16 and the radius of curvature R13 of the object side 17a of the seventh lens 17 is R12/R13=-1.31.

It can be seen from the numerical values of the above relational expressions that the optical imaging lens group 10 of the first embodiment satisfies the requirements of the relational expressions (1) to (15).

Referring to FIG. 1B , from left to right in the figure are the longitudinal spherical aberration diagram, astigmatism field curvature aberration diagram and distortion aberration diagram of the optical imaging lens group 10 . It can be seen from the longitudinal spherical aberration diagram that the off-axis rays of the three kinds of visible light 470nm, 550nm and 650nm wavelengths at different heights can be concentrated near the imaging point, and the deviation of the imaging point can be controlled within + 0.03mm. From the astigmatism and field curvature aberration diagram (wavelength 550nm), it can be seen that the focal length variation of the sagittal direction aberration within the entire field of view is within + 0.05mm; the meridian direction aberration within the focal length of the entire field of view The variation is within + 0.03mm; and the distortion aberration can be controlled within 30%. As shown in FIG. 1B , the optical imaging lens group 10 of this embodiment has well corrected various aberrations and meets the imaging quality requirements of the optical system. second embodiment

Referring to FIG. 2A and FIG. 2B , FIG. 2A is a schematic diagram of an optical imaging lens group according to a second embodiment of the present invention. Fig. 2B is, from left to right, the diagram of Longitudinal Spherical Aberration, Astigmatism/Field Curvature and Distortion of the second embodiment of the present invention.

As shown in FIG. 2A, the optical imaging lens group 20 of the second embodiment includes a first lens 21, a second lens 22, a third lens 23, a fourth lens 24, a diaphragm ST, and a second lens in sequence from the object side to the image side. Fifth lens 25 , sixth lens 26 and seventh lens 27 . The optical imaging lens set 20 may further include a filter element 28 , a protective glass 29 and an imaging surface 200 . An image sensing element 210 can be further disposed on the imaging surface 200 to form an imaging device (not otherwise labeled).

The first lens 21 has a negative refractive power, its object side 21 a is convex, its image side 21 b is concave, and both its object side 21 a and image side 21 b are spherical. The material of the first lens 21 is glass.

The second lens 22 has negative refractive power, its object side 22 a is concave, its image side 22 b is concave, and both its object side 22 a and image side 22 b are spherical. The material of the second lens 22 is glass.

The third lens 23 has negative refractive power, the object side 23a is concave, the image side 23b is convex, and both the object side 23a and the image side 23b are aspherical. The material of the third lens 23 is plastic.

The fourth lens 24 has positive refractive power, its object side 24 a is convex, its image side 24 b is concave, and its object side 24 a and image side 24 b are both aspherical. The material of the fourth lens 24 is glass.

The fifth lens 25 has positive refractive power, its object side 25 a is convex, its image side 25 b is convex, and both its object side 25 a and image side 25 b are spherical. The fifth lens 25 is made of glass.

The sixth lens 26 has negative refractive power, its object side 26 a is concave, its image side 26 b is convex, and its object side 26 a and image side 26 b are both spherical. The sixth lens 26 is made of glass. Wherein, the image side 25b of the fifth lens 25 and the object side 26a of the sixth lens 26 have the same radius of curvature, and are bonded together to form a cemented lens.

The seventh lens 27 has positive refractive power, its object side 27a is convex, its image side 27b is convex, and its object side 27a and image side 27b are spherical. The material of the seventh lens 27 is glass.

The filter element 28 is disposed between the seventh lens 27 and the imaging surface 200 to filter out light in a specific wavelength range, such as an infrared filter (IR Filter). The two surfaces 28a, 28b of the filter element 28 are both flat and made of glass.

The protective glass 29 is disposed on the image sensing element 210 , and its two surfaces 29 a , 29 b are both flat and made of glass.

The image sensor (Image Sensor) 210 is, for example, a Charge-Coupled Device (CCD) Image Sensor or a Complementary Metal Oxide Semiconductor Sensor (CMOS Image Sensor).

The detailed optical data and aspheric coefficients of the lens surface of the optical imaging lens group 20 of the second embodiment are listed in Table 3 and Table 4 respectively. In the second embodiment, the curve equation of the aspheric surface is expressed in the form of the first embodiment. second embodiment EFL= 2.09 mm, Fno = 2.41, HFOV = 105 deg surface surface type Radius of curvature (mm) Distance (mm) Refractive index Dispersion coefficient focal length(mm) material subject unlimited unlimited first lens 21a sphere 18.042 0.500 1.839 42.7 -11.43 Glass 21b sphere 6.181 2.823 second lens 22a sphere -41.116 0.500 1.776 49.6 -4.87 Glass 22b sphere 4.183 3.669 third lens 23a Aspherical -3.549 1.558 1.668 20.4 -980.09 plastic 23b Aspherical -4.196 0.116 fourth lens 24a Aspherical 3.123 1.997 1.694 31.3 8.86 Glass 24b Aspherical 4.690 1.581 aperture ST flat unlimited 0.000 fifth lens 25a sphere 13.249 1.607 1.799 45.3 2.69 Glass 25b (glued side) sphere -2.426 0.000 sixth lens 26a (glued side) sphere -2.426 0.511 1.957 17.9 -3.77 Glass 26b sphere -8.190 1.870 seventh lens 27a sphere 20.190 1.211 1.625 58.2 12.00 Glass 27b sphere -11.665 0.397 filter element 28a flat unlimited 0.210 1.517 64.2 Glass 28b flat unlimited 2.610 protective glass 29a flat unlimited 0.400 1.517 64.2 Glass 29b flat unlimited 0.100 imaging surface 200 flat unlimited Reference wavelength: 550 nm Table three Aspheric coefficient of the second embodiment surface 23a 23b 24a 24b K -5.65E-01 -1.00E+00 3.71E-01 5.13E+00 A ₂ 0.00E+00 0.00E+00 0.00E+00 0.00E+00 A ₄ -3.48E-03 -9.49E-04 6.90E-04 1.78E-03 A ₆ 1.50E-04 -3.87E-05 -5.40E-08 1.72E-03 A ₈ 2.72E-06 9.14E-06 -7.80E-06 -5.45E-04 A ₁₀ 8.88E-08 -1.53E-07 3.68E-07 1.16E-04 A ₁₂ 9.65E-09 -9.31E-09 1.53E-08 1.66E-25 A ₁₄ -3.09E-28 -7.77E-28 0.00E+00 0.00E+00 Table four

In the second embodiment, the values of the relational expressions of the optical imaging lens group 20 are listed in Table 5. It can be known from Table 5 that the optical imaging lens group 20 of the second embodiment satisfies the requirements of relational expressions (1) to (15). Relational value f56/EFL 4.38 |f1| 11.43 |f2| 4.87 f7 12.00 f4/EFL 4.24 R1/EFL 8.63 f1/f2 2.35 (R5+R6)/(R6-R5) 11.97 (R7+R8)/(R8-R7) 4.99 f567/EFL 2.88 |f3|/EFL 468.94 f5/EFL 1.29 f7/EFL 5.74 Nd5 1.799 Nd6 1.957 Vd5 45.3 Vd6 17.9 R12/R13 -0.41 AT67/EFL 0.89 Table five

Referring to FIG. 2B , from left to right in the figure are the longitudinal spherical aberration diagram, the astigmatism field curvature aberration diagram and the distortion aberration diagram of the optical imaging lens group 20 . It can be seen from the longitudinal spherical aberration diagram that the off-axis rays of the three visible light wavelengths of 470nm, 550nm and 650nm at different heights can be concentrated near the imaging point, and the deviation of the imaging point can be controlled within + 0.02mm. From the astigmatism and field curvature aberration diagram (wavelength 550nm), it can be seen that the focal length variation of the sagittal direction aberration in the entire field of view is within + 0.06mm; The variation is within + 0.02mm; and the distortion aberration can be controlled within 35%. As shown in FIG. 2B , the optical imaging lens group 20 of this embodiment has well corrected various aberrations and meets the imaging quality requirements of the optical system. third embodiment

Referring to FIG. 3A and FIG. 3B , FIG. 3A is a schematic diagram of an optical imaging lens group according to a third embodiment of the present invention. Fig. 3B is, from left to right, the diagram of Longitudinal Spherical Aberration, Astigmatism/Field Curvature and Distortion of the third embodiment of the present invention.

As shown in FIG. 3A, the optical imaging lens group 30 of the third embodiment includes a first lens 31, a second lens 32, a third lens 33, a fourth lens 34, a diaphragm ST, and a second lens in sequence from the object side to the image side. Fifth lens 35 , sixth lens 36 and seventh lens 37 . The optical imaging lens set 30 may further include a filter element 38 , a protective glass 39 and an imaging surface 300 . An image sensing element 310 can be further disposed on the imaging surface 300 to form an imaging device (not otherwise labeled).

The first lens 31 has negative refractive power, its object side 31 a is convex, its image side 31 b is concave, and both its object side 31 a and image side 31 b are spherical. The material of the first lens 31 is glass.

The second lens 32 has a negative refractive power. The object side 32a is convex, the image side 32b is concave, and both the object side 32a and the image side 32b are spherical. The material of the second lens 32 is glass.

The third lens 33 has positive refractive power, the object side 33a is concave, the image side 33b is convex, and both the object side 33a and the image side 33b are aspherical. The material of the third lens 33 is glass.

The fourth lens 34 has positive refractive power, its object side 34 a is convex, its image side 34 b is concave, and its object side 34 a and image side 34 b are both aspherical. The material of the fourth lens 34 is glass.

The fifth lens 35 has positive refractive power, its object side 35 a is convex, its image side 35 b is convex, and both its object side 35 a and image side 35 b are spherical. The material of the fifth lens 35 is glass.

The sixth lens 36 has negative refractive power, its object side 36 a is concave, its image side 36 b is convex, and its object side 36 a and image side 36 b are both spherical. The sixth lens 36 is made of glass. Wherein, the image side 35b of the fifth lens 35 and the object side 36a of the sixth lens 36 have the same curvature radius, and are bonded together to form a cemented lens.

The seventh lens 37 has positive refractive power, its object side 37a is convex, its image side 37b is concave, and its object side 37a and image side 37b are spherical. The material of the seventh lens 37 is glass.

The filter element 38 is disposed between the seventh lens 37 and the imaging surface 300 to filter out light in a specific wavelength range, such as an infrared filter (IR Filter). The two surfaces 38a, 38b of the filter element 38 are both flat and made of glass.

The protective glass 39 is disposed on the image sensing element 310 , and its two surfaces 39 a, 39 b are both flat and made of glass.

The image sensor (Image Sensor) 310 is, for example, a Charge-Coupled Device (CCD) Image Sensor or a Complementary Metal Oxide Semiconductor Sensor (CMOS Image Sensor).

The detailed optical data and aspheric coefficients of the lens surface of the optical imaging lens group 30 of the third embodiment are listed in Table 6 and Table 7, respectively. In the third embodiment, the curve equation of the aspheric surface is expressed in the form of the first embodiment. third embodiment EFL= 1.96 mm, Fno = 2.58, HFOV= 105 deg surface surface type Radius of curvature (mm) Distance (mm) Refractive index Dispersion coefficient focal length(mm) material subject unlimited unlimited first lens 31a sphere 16.000 0.500 1.839 43.1 -8.87 Glass 31b sphere 5.007 3.778 second lens 32a sphere 52.092 0.500 1.758 52.3 -4.78 Glass 32b sphere 3.377 3.751 third lens 33a Aspherical -3.036 1.482 1.640 35.3 619.89 Glass 33b Aspherical -3.587 0.100 fourth lens 34a Aspherical 2.984 2.216 1.704 30.1 8.28 Glass 34b Aspherical 4.240 0.828 aperture ST flat unlimited 0.000 fifth lens 35a sphere 7.952 1.774 1.758 52.3 2.38 Glass 35b (glued side) sphere -2.107 0.000 sixth lens 36a (glued side) sphere -2.107 0.223 1.932 20.9 -2.79 Glass 36b sphere -11.648 3.779 seventh lens 37a sphere 4.692 1.211 1.623 60.3 9.82 Glass 37b sphere 18.161 0.397 filter element 38a flat unlimited 0.210 1.517 64.2 Glass 38b flat unlimited 1.130 protective glass 39a flat unlimited 0.400 1.517 64.2 Glass 39b flat unlimited 0.093 imaging surface 300 flat unlimited Reference wavelength: 550 nm Table six Aspheric coefficient of the third embodiment surface 33a 33b 34a 34b K -6.13E-01 -1.45E+00 2.35E-01 4.00E+00 A ₂ 0.00E+00 0.00E+00 0.00E+00 0.00E+00 A ₄ 1.59E-03 2.39E-04 -5.53E-05 -2.36E-03 A ₆ 1.56E-04 -4.48E-05 -2.02E-06 1.72E-03 A ₈ 4.59E-06 8.11E-06 -8.63E-06 -5.06E-04 A ₁₀ 2.82E-07 -2.45E-07 1.60E-07 1.44E-04 A ₁₂ 2.92E-08 -3.95E-09 -3.11E-08 1.66E-25 A ₁₄ -3.06E-28 -7.72E-28 0.00E+00 0.00E+00 Table Seven

In the third embodiment, the values of the relational expressions of the optical imaging lens group 30 are listed in Table VIII. It can be seen from Table 8 that the optical imaging lens group 30 of the third embodiment satisfies the requirements of relational expressions (1) to (15). Relational value f56/EFL 5.50 |f1| 8.87 |f2| 4.78 f7 9.82 f4/EFL 4.22 R1/EFL 8.16 f1/f2 1.86 (R5+R6)/(R6-R5) 12.02 (R7+R8)/(R8-R7) 5.75 f567/EFL 3.37 |f3|/EFL 316.27 f5/EFL 1.21 f7/EFL 5.01 Nd5 1.758 Nd6 1.932 Vd5 52.3 Vd6 20.9 R12/R13 -2.48 AT67/EFL 1.93 table eight

Referring to FIG. 3B , from left to right in the figure are the longitudinal spherical aberration diagram, the astigmatism field curvature aberration diagram and the distortion aberration diagram of the optical imaging lens group 30 . It can be seen from the longitudinal spherical aberration diagram that the off-axis rays of the three visible light wavelengths of 470nm, 550nm and 650nm at different heights can be concentrated near the imaging point, and the deviation of the imaging point can be controlled within + 0.02mm. From the astigmatism and field curvature aberration diagram (wavelength 550nm), it can be seen that the focal length variation of the sagittal direction aberration in the entire field of view is within + 0.06mm; The variation is within + 0.07mm; and the distortion aberration can be controlled within 20%. As shown in FIG. 3B , the optical imaging lens group 30 of this embodiment has well corrected various aberrations and meets the imaging quality requirements of the optical system. Fourth embodiment

Referring to FIG. 4A and FIG. 4B , FIG. 4A is a schematic diagram of an optical imaging lens group according to a fourth embodiment of the present invention. Fig. 4B is, from left to right, the diagram of Longitudinal Spherical Aberration, Astigmatism/Field Curvature and Distortion of the fourth embodiment of the present invention.

As shown in FIG. 4A, the optical imaging lens group 40 of the fourth embodiment includes a first lens 41, a second lens 42, a third lens 43, a fourth lens 44, a diaphragm ST, and a second lens in sequence from the object side to the image side. Fifth lens 45 , sixth lens 46 and seventh lens 47 . The optical imaging lens set 40 can further include a filter element 48 , a protective glass 49 and an imaging surface 400 . An image sensing element 410 can be further disposed on the imaging surface 400 to form an imaging device (not labeled otherwise).

The first lens 41 has a negative refractive power, its object side 41 a is convex, its image side 41 b is concave, and both its object side 41 a and image side 41 b are spherical. The material of the first lens 41 is glass.

The second lens 42 has a negative refractive power. The object side 42a is convex, the image side 42b is concave, and both the object side 42a and the image side 42b are spherical. The material of the second lens 42 is glass.

The third lens 43 has negative refractive power, the object side 43a is concave, the image side 43b is convex, and both the object side 43a and the image side 43b are aspherical. The material of the third lens 43 is glass.

The fourth lens 44 has a positive refractive power, its object side 44 a is convex, its image side 44 b is concave, and both its object side 44 a and image side 44 b are aspherical. The material of the fourth lens 44 is glass.

The fifth lens 45 has a positive refractive power, its object side 45 a is convex, its image side 45 b is convex, and both its object side 45 a and image side 45 b are spherical. The material of the fifth lens 45 is glass.

The sixth lens 46 has negative refractive power, its object side 46 a is concave, its image side 46 b is convex, and its object side 46 a and image side 46 b are both spherical. The sixth lens 46 is made of glass. Wherein, the image side 45b of the fifth lens 45 and the object side 46a of the sixth lens 46 have the same radius of curvature, and are bonded together to form a cemented lens.

The seventh lens 47 has positive refractive power, its object side 47 a is convex, its image side 47 b is concave, and its object side 47 a and image side 47 b are spherical. The material of the seventh lens 47 is glass.

The filter element 48 is disposed between the seventh lens 47 and the imaging surface 400 to filter out light in a specific wavelength range, such as an infrared filter (IR Filter). The two surfaces 48a, 48b of the filter element 48 are both flat and made of glass.

The protective glass 49 is disposed on the image sensing element 410 , and its two surfaces 49 a , 49 b are both flat and made of glass.

The image sensor (Image Sensor) 410 is, for example, a Charge-Coupled Device (CCD) Image Sensor or a Complementary Metal Oxide Semiconductor Sensor (CMOS Image Sensor).

The detailed optical data and aspheric coefficients of the lens surface of the optical imaging lens group 40 of the fourth embodiment are listed in Table 9 and Table 10, respectively. In the fourth embodiment, the curve equation of the aspheric surface is expressed in the form of the first embodiment. Fourth embodiment EFL= 2.36 mm, Fno = 2.10, HFOV = 95 deg surface surface type Radius of curvature (mm) Distance (mm) Refractive index Dispersion coefficient focal length(mm) material subject unlimited unlimited first lens 41a sphere 16.287 0.500 1.807 45.5 -10.94 Glass 41b sphere 5.648 1.780 second lens 42a sphere 9.167 0.632 1.750 51.0 -8.21 Glass 42b sphere 3.576 3.827 third lens 43a Aspherical -2.860 1.470 1.652 33.8 -83.13 Glass 43b Aspherical -3.632 0.095 fourth lens 44a Aspherical 3.054 2.229 1.725 34.7 8.67 Glass 44b Aspherical 4.120 1.106 aperture ST flat unlimited 0.000 fifth lens 45a sphere 6.594 1.989 1.777 49.6 2.52 Glass 45b (glued side) sphere -2.414 0.000 sixth lens 46a (glued side) sphere -2.414 1.132 1.971 17.5 -3.97 Glass 46b sphere -7.958 1.861 seventh lens 47a sphere 7.669 1.503 1.625 58.2 17.00 Glass 47b sphere 25.459 0.397 filter element 48a flat unlimited 0.210 1.517 64.2 Glass 48b flat unlimited 0.639 protective glass 49a flat unlimited 0.400 1.517 64.2 Glass 49b flat unlimited 0.124 imaging surface 400 flat unlimited Reference wavelength: 550 nm Table nine The aspheric coefficient of the fourth embodiment surface 43a 43b 44a 44b K -5.83E-01 -1.31E+00 2.70E-01 4.24E+00 A ₂ 0.00E+00 0.00E+00 0.00E+00 0.00E+00 A ₄ 1.66E-03 3.06E-04 -9.26E-05 -2.09E-03 A ₆ 1.54E-04 -4.05E-05 1.41E-06 1.72E-03 A ₈ 3.62E-06 8.69E-06 -7.47E-06 -5.46E-04 A ₁₀ 1.02E-07 -1.81E-07 3.72E-07 1.16E-04 A ₁₂ 3.01E-22 -2.65E-22 -1.86E-24 1.66E-25 A ₁₄ -3.09E-28 -7.77E-28 0.00E+00 0.00E+00 table ten

In the fourth embodiment, the values of the relational expressions of the optical imaging lens group 40 are listed in Table 11. It can be seen from Table 11 that the optical imaging lens group 40 of the fourth embodiment satisfies the requirements of relational expressions (1) to (15). Relational value f56/EFL 2.81 |f1| 10.94 |f2| 8.21 f7 17.00 f4/EFL 3.67 R1/EFL 6.90 f1/f2 1.33 (R5+R6)/(R6-R5) 8.41 (R7+R8)/(R8-R7) 6.73 f567/EFL 2.26 |f3|/EFL 35.22 f5/EFL 1.07 f7/EFL 7.20 Nd5 1.777 Nd6 1.971 Vd5 49.6 Vd6 17.5 R12/R13 -1.04 AT67/EFL 0.79 Table Eleven

Referring to FIG. 4B , from left to right in the figure are the longitudinal spherical aberration diagram, the astigmatism field curvature aberration diagram and the distortion aberration diagram of the optical imaging lens group 40 . It can be seen from the longitudinal spherical aberration diagram that the off-axis rays of the three kinds of visible light 470nm, 550nm and 650nm wavelengths at different heights can be concentrated near the imaging point, and the deviation of the imaging point can be controlled within + 0.03mm. From the astigmatism and field curvature aberration diagram (wavelength 550nm), it can be seen that the focal length variation of the sagittal direction aberration in the entire field of view is within + 0.02mm; The variation is within + 0.02mm; and the distortion aberration can be controlled within 20%. As shown in FIG. 4B , the optical imaging lens group 40 of this embodiment has well corrected various aberrations and meets the imaging quality requirements of the optical system. fifth embodiment

Referring to FIG. 5A and FIG. 5B , FIG. 5A is a schematic diagram of an optical imaging lens group according to a fifth embodiment of the present invention. Fig. 5B is, from left to right, the diagram of Longitudinal Spherical Aberration, Astigmatism/Field Curvature and Distortion of the fifth embodiment of the present invention.

As shown in FIG. 5A, the optical imaging lens group 50 of the fifth embodiment includes a first lens 51, a second lens 52, a third lens 53, a fourth lens 54, a diaphragm ST, and a second lens in sequence from the object side to the image side. Fifth lens 55 , sixth lens 56 and seventh lens 57 . The optical imaging lens set 50 can further include a filter element 58 , a protective glass 59 and an imaging surface 500 . An image sensing element 510 can be further disposed on the imaging surface 500 to form an imaging device (not otherwise labeled).

The first lens 51 has a negative refractive power, its object side 51 a is convex, its image side 51 b is concave, and both its object side 51 a and image side 51 b are spherical. The material of the first lens 51 is glass.

The second lens 52 has a negative refractive power, its object side 52 a is convex, its image side 52 b is concave, and both its object side 52 a and image side 52 b are spherical. The material of the second lens 52 is glass.

The third lens 53 has negative refractive power, the object side 53a is concave, the image side 53b is convex, and both the object side 53a and the image side 53b are aspherical. The material of the third lens 53 is glass.

The fourth lens 54 has positive refractive power, its object side 54 a is convex, its image side 54 b is concave, and its object side 54 a and image side 54 b are both aspherical. The material of the fourth lens 54 is glass.

The fifth lens 55 has a positive refractive power, its object side 55 a is convex, its image side 55 b is convex, and both its object side 55 a and image side 55 b are spherical. The material of the fifth lens 55 is glass.

The sixth lens 56 has a negative refractive power, its object side 56 a is concave, its image side 56 b is convex, and both its object side 56 a and image side 56 b are spherical. The sixth lens 56 is made of glass. Wherein, the image side 55b of the fifth lens 55 and the object side 56a of the sixth lens 56 have the same curvature radius, and are bonded together to form a cemented lens.

The seventh lens 57 has positive refractive power, its object side 57a is convex, its image side 57b is concave, and its object side 57a and image side 57b are spherical. The material of the seventh lens 57 is glass.

The filter element 58 is disposed between the seventh lens 57 and the imaging surface 500 to filter out light in a specific wavelength range, such as an infrared filter (IR Filter). The two surfaces 58a, 58b of the filter element 58 are both flat and made of glass.

The protective glass 59 is disposed on the image sensing element 510 , and its two surfaces 59 a , 59 b are both flat and made of glass.

The image sensor (Image Sensor) 510 is, for example, a Charge-Coupled Device (CCD) Image Sensor or a Complementary Metal Oxide Semiconductor Sensor (CMOS Image Sensor).

The detailed optical data and aspheric coefficients of the lens surface of the optical imaging lens group 50 of the fifth embodiment are listed in Table 12 and Table 13, respectively. In the fifth embodiment, the curve equation of the aspheric surface is expressed in the form of the first embodiment. fifth embodiment EFL= 2.27mm, Fno = 1.62, HFOV = 105 deg surface surface type Radius of curvature (mm) Distance (mm) Refractive index Dispersion coefficient focal length(mm) material subject unlimited unlimited first lens 51a sphere 19.166 0.500 1.825 42.7 -11.62 Glass 51b sphere 6.314 0.900 second lens 52a sphere 9.145 0.500 1.697 49.2 -10.68 Glass 52b sphere 4.011 3.205 third lens 53a Aspherical -2.893 1.312 1.810 40.7 -684.10 Glass 53b Aspherical -3.498 0.100 fourth lens 54a Aspherical 3.105 2.235 1.671 33.0 9.69 Glass 54b Aspherical 4.223 2.108 aperture ST flat unlimited 0.000 fifth lens 55a sphere 5.533 0.900 1.776 49.6 2.21 Glass 55b (glued side) sphere -2.310 0.000 sixth lens 56a (glued side) sphere -2.310 0.563 1.932 20.9 -4.02 Glass 56b sphere -6.740 1.360 seventh lens 57a sphere 7.064 1.887 1.611 58.9 19.25 Glass 57b sphere 15.900 0.397 filter element 58a flat unlimited 0.210 Glass 58b flat unlimited 0.120 protective glass 59a flat unlimited 0.400 Glass 59b flat unlimited 0.154 imaging surface 500 flat unlimited Reference wavelength: 550 nm Table 12 Aspherical coefficient of the fifth embodiment surface 53a 53b 54a 54b K -5.85E-01 -1.28E+00 1.90E-01 3.68E+00 A ₂ 0.00E+00 0.00E+00 0.00E+00 0.00E+00 A ₄ 1.60E-03 2.65E-04 -3.97E-05 -2.27E-03 A ₆ 1.76E-04 -3.33E-05 1.03E-04 1.04E-03 A ₈ 5.44E-06 8.94E-06 -2.53E-05 -2.68E-04 A ₁₀ 1.61E-07 -1.64E-07 3.73E-07 1.00E-04 A ₁₂ -5.60E-09 2.06E-09 8.68E-08 -1.86E-05 A ₁₄ -3.52E-10 1.40E-10 0.00E+00 0.00E+00 Table 13

In the fifth embodiment, the values of the relational expressions of the optical imaging lens group 50 are listed in Table 14. It can be known from Table 14 that the optical imaging lens group 50 of the fifth embodiment satisfies the requirements of relational expressions (1) to (15). Relational value f56/EFL 2.17 |f1| 11.62 |f2| 10.68 f7 19.25 f4/EFL 4.27 R1/EFL 8.44 f1/f2 1.09 (R5+R6)/(R6-R5) 10.56 (R7+R8)/(R8-R7) 6.55 f567/EFL 1.80 |f3|/EFL 301.37 f5/EFL 0.97 f7/EFL 8.48 Nd5 1.776 Nd6 1.932 Vd5 49.6 Vd6 20.9 R12/R13 -0.95 AT67/EFL 0.60 Table Fourteen

Referring to FIG. 5B , from left to right in the figure are the longitudinal spherical aberration diagram, the astigmatism field curvature aberration diagram and the distortion aberration diagram of the optical imaging lens group 50 . It can be seen from the longitudinal spherical aberration diagram that the off-axis rays of the three kinds of visible light 470nm, 550nm and 650nm wavelengths at different heights can be concentrated near the imaging point, and the deviation of the imaging point can be controlled within + 0.03mm. From the astigmatism and field curvature aberration diagram (wavelength 550nm), it can be seen that the focal length variation of the sagittal direction aberration within the entire field of view is within + 0.04mm; the meridian direction aberration within the focal length of the entire field of view The variation is within + 0.03mm; and the distortion aberration can be controlled within 40%. As shown in FIG. 5B , the optical imaging lens group 50 of this embodiment has well corrected various aberrations and meets the imaging quality requirements of the optical system. Sixth embodiment

Referring to FIG. 6A and FIG. 6B , FIG. 6A is a schematic diagram of an optical imaging lens group according to a sixth embodiment of the present invention. Fig. 6B is, from left to right, the diagram of Longitudinal Spherical Aberration, Astigmatism/Field Curvature and Distortion of the sixth embodiment of the present invention.

As shown in FIG. 6A, the optical imaging lens group 60 of the sixth embodiment includes a first lens 61, a second lens 62, a third lens 63, a fourth lens 64, a diaphragm ST, and a second lens in sequence from the object side to the image side. Fifth lens 65 , sixth lens 66 and seventh lens 67 . The optical imaging lens set 60 may further include a filter element 68 , a protective glass 69 and an imaging surface 600 . An image sensing element 610 can be further disposed on the imaging surface 600 to form an imaging device (not otherwise labeled).

The first lens 61 has a negative refractive power, its object side 61 a is convex, its image side 61 b is concave, and both its object side 61 a and image side 61 b are spherical. The material of the first lens 61 is glass.

The second lens 62 has a negative refractive power. The object side 62a is convex, the image side 62b is concave, and both the object side 62a and the image side 62b are spherical. The material of the second lens 62 is glass.

The third lens 63 has positive refractive power, the object side 63a is concave, the image side 63b is convex, and both the object side 63a and the image side 63b are aspherical. The material of the third lens 63 is plastic.

The fourth lens 64 has positive refractive power, its object side 64 a is convex, its image side 64 b is concave, and its object side 64 a and image side 64 b are both aspherical. The material of the fourth lens 64 is glass.

The fifth lens 65 has a positive refractive power, its object side 65 a is convex, its image side 65 b is convex, and both its object side 65 a and image side 65 b are spherical. The material of the fifth lens 65 is glass.

The sixth lens 66 has negative refractive power, its object side 66 a is concave, its image side 66 b is convex, and its object side 66 a and image side 66 b are both spherical. The sixth lens 66 is made of glass. Wherein, the image side 65b of the fifth lens 65 and the object side 66a of the sixth lens 66 have the same radius of curvature, and are bonded together to form a cemented lens.

The seventh lens 67 has positive refractive power, its object side 67 a is convex, its image side 67 b is convex, and its object side 67 a and image side 67 b are spherical. The material of the seventh lens 67 is glass.

The filter element 68 is disposed between the seventh lens 67 and the imaging surface 600 to filter out light in a specific wavelength range, such as an infrared filter (IR Filter). The two surfaces 68a, 68b of the filter element 68 are both flat and made of glass.

The protective glass 69 is disposed on the image sensing element 610 , and its two surfaces 69 a, 69 b are both flat and made of glass.

The image sensor (Image Sensor) 610 is, for example, a Charge-Coupled Device (CCD) Image Sensor or a Complementary Metal Oxide Semiconductor Sensor (CMOS Image Sensor).

The detailed optical data and aspheric coefficients of the lens surface of the optical imaging lens group 60 of the sixth embodiment are listed in Table 15 and Table 16, respectively. In the sixth embodiment, the curve equation of the aspheric surface is expressed in the form of the first embodiment. Sixth embodiment EFL= 2.03mm, Fno=2.12, HFOV=105 deg surface surface type Radius of curvature (mm) Distance (mm) Refractive index Dispersion coefficient focal length(mm) material subject unlimited unlimited first lens 61a sphere 17.670 0.500 1.859 40.4 -8.60 Glass 61b sphere 5.139 2.200 second lens 62a sphere 8.349 0.500 1.776 49.6 -7.84 Glass 62b sphere 3.427 4.325 third lens 63a Aspherical -2.899 1.618 1.645 23.5 134.57 plastic 63b Aspherical -3.419 0.100 fourth lens 64a Aspherical 2.984 2.160 1.677 32.2 8.29 Glass 64b Aspherical 4.511 0.809 aperture ST flat unlimited 0.000 fifth lens 65a sphere 7.176 1.610 1.758 52.3 2.10 Glass 65b (glued side) sphere -1.853 0.000 sixth lens 66a (glued side) sphere -1.853 0.500 1.932 21.3 -2.34 Glass 66b sphere -13.798 1.389 seventh lens 67a sphere 7.278 1.211 1.625 56.9 11.02 Glass 67b sphere -119.438 0.397 filter element 68a flat unlimited 0.210 1.517 64.2 Glass 68b flat unlimited 1.528 protective glass 69a flat unlimited 0.400 1.517 64.2 Glass 69b flat unlimited 0.130 imaging surface 600 flat unlimited Reference wavelength: 550 nm Table 15 Aspheric Coefficient of the Sixth Embodiment surface 63a 63b 64a 64b K -4.81E-01 -1.16E+00 2.57E-01 4.80E+00 A ₂ 0.00E+00 0.00E+00 0.00E+00 0.00E+00 A ₄ 2.85E-04 -6.72E-04 -6.23E-04 -4.09E-03 A ₆ 2.69E-06 -9.04E-05 -1.03E-04 5.60E-04 A ₈ 3.69E-06 8.65E-06 -7.58E-06 -5.43E-04 A ₁₀ 1.09E-07 -1.87E-07 3.10E-07 1.19E-04 A ₁₂ 4.48E-10 -7.82E-10 -1.36E-08 1.66E-25 A ₁₄ -2.76E-28 -7.75E-28 0.00E+00 0.00E+00 Table 16

In the sixth embodiment, the values of the relational expressions of the optical imaging lens group 60 are listed in Table 17. It can be known from Table 17 that the optical imaging lens group 60 of the sixth embodiment satisfies the requirements of relational expressions (1) to (15). Relational value f56/EFL 6.04 |f1| 8.60 |f2| 7.84 f7 11.02 f4/EFL 4.08 R1/EFL 8.70 f1/f2 1.10 (R5+R6)/(R6-R5) 12.15 (R7+R8)/(R8-R7) 4.91 f567/EFL 3.23 |f3|/EFL 66.29 f5/EFL 1.03 f7/EFL 5.43 Nd5 1.758 Nd6 1.932 Vd5 52.3 Vd6 21.3 R12/R13 -1.90 AT67/EFL 0.68 Table 17

Referring to FIG. 6B , from left to right in the figure are the longitudinal spherical aberration diagram, astigmatism field curvature aberration diagram and distortion aberration diagram of the optical imaging lens group 60 . It can be seen from the longitudinal spherical aberration diagram that the off-axis rays of the three kinds of visible light 470nm, 550nm and 650nm wavelengths at different heights can be concentrated near the imaging point, and the deviation of the imaging point can be controlled within + 0.03mm. From the astigmatism and field curvature aberration diagram (wavelength 550nm), it can be seen that the focal length variation of the sagittal direction aberration within the entire field of view is within + 0.04mm; the meridian direction aberration within the focal length of the entire field of view The variation is within + 0.03mm; and the distortion aberration can be controlled within 25%. As shown in FIG. 6B , the optical imaging lens group 60 of this embodiment has well corrected various aberrations and meets the imaging quality requirements of the optical system. Seventh embodiment

The seventh embodiment of the present invention is an imaging device, which includes the optical imaging lens group as in the aforementioned first to sixth embodiments, and an image sensing element; Like the imaging surface of the lens group. The image sensing element is, for example, a Charge-Coupled Device (CCD) or a Complementary Metal Oxide Semiconductor (CMOS) image sensing element. The imaging device is, for example, a camera module for vehicle photography, a camera module for portable electronic products, or a camera module for surveillance cameras. Eighth embodiment

Please refer to FIG. 7 , which is a schematic diagram of an electronic device 1000 according to an eighth embodiment of the present invention. As shown in the figure, the electronic device 1000 includes an imaging device 1010 . The imaging device 1010 is, for example, the imaging device of the aforementioned seventh embodiment, which may be composed of the optical imaging lens group and an image sensing element of the present invention. The electronic device 1000 is, for example, a car camera, a surveillance camera, or an aerial camera.

Although the present invention has been described using the preceding several examples, these examples are not intended to limit the scope of the present invention. For those skilled in the technical field of the present invention, without departing from the spirit and scope of the present invention, various changes in form and details can still be made with reference to the disclosed embodiments of the present invention. Therefore, what needs to be understood here is that the present invention is defined by the scope of the following patent application, and any changes made within the scope of the patent application or its equivalent scope should still fall into the application within the scope of the patent.

10, 20, 30, 40, 50, 60: Optical imaging lens group 11, 21, 31, 41, 51, 61: the first lens 12, 22, 32, 42, 52, 62: second lens 13, 23, 33, 43, 53, 63: third lens 4, 14, 24, 34, 44, 54, 64: the fourth lens 15, 25, 35, 45, 55, 65: fifth lens 6, 16, 26, 36, 46, 56, 66: sixth lens 17, 27, 37, 47, 57, 67: the seventh lens 18, 28, 38, 48, 58, 68: filter elements 19, 29, 39, 49, 59, 69: protective glass 100, 200, 300, 400, 500, 600: imaging surface 11a, 21a, 31a, 41a, 51a, 61a: the object side of the first lens 11b, 21b, 31b, 41b, 51b, 61b: image side of the first lens 12a, 22a, 32a, 42a, 52a, 62a: the object side of the second lens 12b, 22b, 32b, 42b, 52b, 62b: the image side of the second lens 13a, 23a, 33a, 43a, 53a, 63a: the object side of the third lens 13b, 23b, 33b, 43b, 53b, 63b: the image side of the third lens 14a, 24a, 34a, 44a, 54a, 64a: the object side of the fourth lens 14b, 24b, 34b, 44b, 54b, 64b: the image side of the fourth lens 15a, 25a, 35a, 45a, 55a, 65a: the object side of the fifth lens 15b, 25b, 35b, 45b, 55b, 65b: image side of the fifth lens 16a, 26a, 36a, 46a, 56a, 66a: the object side of the sixth lens 16b, 26b, 36b, 46b, 56b, 66b: image side of the sixth lens 17a, 27a, 37a, 47a, 57a, 67a: the side of the seventh lens 17b, 27b, 37b, 47b, 57b, 67b: image side of the seventh lens 18a, 18b, 28a, 28b, 38a, 38b, 48a, 48b, 58a, 58b, 68a, 68b: two surfaces of the filter element 19a, 19b, 29a, 29b, 39a, 39b, 49a, 49b, 59a, 59b, 69a, 69b: two surfaces of protective glass Components 110, 210, 310, 410, 510, 610: image sensing 1000: electronic device 1010: imaging device I: optical axis ST: Aperture

[FIG. 1A] is a schematic diagram of the optical imaging lens group of the first embodiment of the present invention; [Fig. 1B] From left to right are the longitudinal spherical aberration diagram, astigmatism field curvature aberration diagram and distortion aberration diagram of the first embodiment of the present invention; [Fig. 2A] is a schematic diagram of the optical imaging lens group of the second embodiment of the present invention; [Fig. 2B] From left to right are the longitudinal spherical aberration diagram, astigmatism field curvature aberration diagram and distortion aberration diagram of the second embodiment of the present invention; [FIG. 3A] is a schematic diagram of the optical imaging lens group of the third embodiment of the present invention; [Fig. 3B] From left to right are the longitudinal spherical aberration diagram, astigmatism field curvature aberration diagram and distortion aberration diagram of the third embodiment of the present invention; [FIG. 4A] is a schematic diagram of the optical imaging lens group of the fourth embodiment of the present invention; [Fig. 4B] From left to right are the longitudinal spherical aberration diagram, astigmatism field curvature aberration diagram and distortion aberration diagram of the fourth embodiment of the present invention; [FIG. 5A] is a schematic diagram of the optical imaging lens group of the fifth embodiment of the present invention; [Fig. 5B] From left to right are the longitudinal spherical aberration diagram, astigmatism field curvature aberration diagram and distortion aberration diagram of the fifth embodiment of the present invention; [FIG. 6A] is a schematic diagram of the optical imaging lens group of the sixth embodiment of the present invention; [Fig. 6B] From left to right is the longitudinal spherical aberration diagram, astigmatism field curvature aberration diagram and distortion aberration diagram of the sixth embodiment of the present invention; and [FIG. 7] is a schematic diagram of an electronic device according to an eighth embodiment of the present invention.

10: Optical imaging lens group

11: First lens

12: Second lens

13: Third lens

14: Fourth lens

15: fifth lens

16: sixth lens

17: seventh lens

18: Filter element

19: Protective glass

100: imaging surface

11a: The side of the object of the first lens

11b: The image side of the first lens

12a: The side of the second lens

12b: The image side of the second lens

13a: The side of the third lens

13b: The image side of the third lens

14a: The side of the fourth lens

14b: The image side of the fourth lens

15a: The side of the fifth lens

15b: The image side of the fifth lens

16a: The side of the sixth lens

16b: The image side of the sixth lens

17a: The side of the object of the seventh lens

17b: The image side of the seventh lens

18a, 18b: two surfaces of the filter element

19a, 19b: the second surface of the protective glass

110: Image sensing element

I: optical axis

ST: Aperture

Claims (12)

An optical image-taking lens group, comprising sequentially from the object side to the image side: a first lens with negative refractive power, the object side is convex and the image side is concave; a second lens has negative refractive power, and the image The side surface is concave; a third lens has refractive power, the object side is concave, and the image side is convex; a fourth lens has positive refractive power, and the object side is convex, and the image side is concave; an aperture; Five lenses with positive refractive power, the object side is convex and the image side is convex; a sixth lens has negative refractive power, the object side is concave and the image side is convex; wherein the fifth lens and the sixth lens The lens constitutes a cemented lens; and a seventh lens has positive refractive power, and its object side surface is convex; wherein, the total number of lenses in the optical imaging lens group is seven; wherein, the fifth lens and the sixth lens The combined focal length is f56, the distance between the sixth lens image side and the seventh lens object side on the optical axis is AT67, and the effective focal length of the optical imaging lens group is EFL, which satisfies the following relationship: 1.7<f56/ EFL<6; 0.4<AT67/EFL<2.3. The optical imaging lens group according to claim 1, wherein the focal length of the first lens is f1, the focal length of the second lens is f2, and the focal length of the seventh lens is f7, which satisfy the following relationship: f7>|f1 |>|f2|. An optical image-taking lens group, comprising sequentially from the object side to the image side: a first lens with negative refractive power, the object side is convex and the image side is concave; a second lens has negative refractive power, and the image The side is concave; a third lens has refractive power, the object side is concave, and the image side is convex; a fourth lens with positive refractive power, the object side is convex and the image side is concave; an aperture; a fifth lens has positive refractive power, the object side is convex and the image side is convex; a sixth lens, It has negative refractive power, its object side is concave, and its image side is convex; wherein, the fifth lens and the sixth lens form a cemented lens; and a seventh lens has positive refractive power, and its object side is convex; wherein , the total number of lenses in the optical imaging lens group is seven pieces; wherein, the focal length of the first lens is f1, the focal length of the second lens is f2, the focal length of the seventh lens is f7, the fifth lens, the second lens The combined focal length of the six lenses and the seventh lens is f567, and the effective focal length of the optical imaging lens group is EFL, which satisfies the following relationship: f7>|f1|>|f2|; 1.5<f567/EFL<3.5. The optical imaging lens group according to claim 1 or 3, wherein the radius of curvature of the object side of the first lens is R1, and the effective focal length of the optical imaging lens group is EFL, which satisfies the following relationship: 5<R1/ EFL<9. The optical imaging lens group according to claim 1 or 3, wherein the focal length of the fourth lens is f4, and the effective focal length of the optical imaging lens group is EFL, which satisfies the following relationship: 3<f4/EFL<8 . The optical imaging lens group as claimed in claim 1 or 3, wherein the focal length of the first lens is f1, and the focal length of the second lens is f2, which satisfy the following relationship: 1<f1/f2<2.5. The optical imaging lens group as claimed in item 1 or 3, wherein the radius of curvature of the object side of the third lens is R5, and the radius of curvature of the image side is R6, which satisfy the following relationship: 6<(R5+R6)/( R6-R5)<14. The optical imaging lens group according to claim 1 or 3, wherein the focal length of the third lens is f3, and the effective focal length of the overall optical imaging lens group is EFL, which satisfies the following relationship: |f3|/EFL>20. The optical imaging lens group according to claim 1 or 3, wherein the focal length of the seventh lens is f7, and the effective focal length of the optical imaging lens group is EFL, which satisfies the following relationship: 4<f7/EFL<9 . The optical imaging lens group of claim 1 or 3, wherein the radius of curvature of the image side of the sixth lens is R12, and the radius of curvature of the object side of the seventh lens is R13, which satisfy the following relationship: -2.5<R12/ R13<-0.3. An imaging device comprising the optical imaging lens group according to claim 1 or 3, and an image sensing element, wherein the image sensing element is arranged on the imaging surface of the optical imaging lens group. An electronic device including the imaging device according to claim 11.

Images