TWI751842B - Optical imaging lens, imaging device and electronic device - Google Patents

Abstract

An optical imaging lens including, from an object side to and an image side, a first lens, a second lens, a third lens, an aperture, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens, wherein the lens powers from the first lens to the eighth lens are negative, negative, positive, negative, positive, positive, negative and positive refractive powers. The first lens includes an image-side surface being concave. The second lens is a double concave lens. The third lens is a double convex lens. The fourth lens includes an object-side surface being concave. The fifth lens includes an image-side surface being convex. The fourth lens and the fifth lens form a cemented lens. The sixth lens includes an image-side surface being convex. The seventh lens is a concave-convex lens. The sixth lens and the seventh lens form a cemented lens. The eighth lens includes an object-side surface being convex. The optical imaging lens includes a total of eight lens elements.

Description

Optical imaging lens group, imaging device and electronic device

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

With the continuous improvement of semiconductor process technology, the pixel size of the image sensor element can reach a smaller size, and the performance is significantly improved. Therefore, an optical lens with high imaging quality has become an indispensable part of electronic camera devices.

With the diversified development of electronic camera devices, their application scope is 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 vehicle photography devices are concerned, in order to clearly identify obstacles around the vehicle or oncoming vehicles on both sides, it is necessary to improve the resolution and brightness of the optical lens, and at the same time, it is required to have a high degree of adaptability to the ambient temperature. In addition, in order to correct various aberrations well, especially for distance measurement or object recognition, if there is a large distortion aberration in the captured image, errors will easily occur in the calculation of distance or the result of image recognition.

Therefore, how to design an optical imaging device to achieve a balance among miniaturization, high resolution and good optical imaging quality has become the goal of those skilled in the art.

Therefore, in order to solve the above problems, the present invention provides an optical imaging lens group, which includes a first lens, a second lens, a third lens, an aperture, a fourth lens, a fifth lens, a Six lens, seventh lens and eighth lens. Among them, the first lens has negative refractive power, and its image side is concave; the second lens has negative refractive power, and its object side is concave and its image side is concave; the third lens has positive refractive power, and its object side is The convex surface and the image side are convex; the fourth lens has negative refractive power, and its object side is concave; the fifth lens has positive refractive power, and its image side is convex, wherein the fourth lens and the fifth lens form a cemented lens The sixth lens has positive refractive power, and its image side is convex; the seventh lens has negative refractive power, and its object side is concave, and its image side is convex, wherein the sixth lens and the seventh lens form a cemented lens; and the eighth lens, with positive refractive power, and its object side surface is convex; wherein, the total number of lenses in the optical image taking lens group is eight; wherein, the focal length of the third lens is f3, the focal length of the eighth lens is f8, It satisfies the following relation: 2<f8/f3<6.

Further, 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 satisfy the following relationship: 1<f3/EFL<5.

Further, according to an embodiment of the present invention, the combined focal length of the fourth lens and the fifth lens is f45, and the effective focal length of the overall optical image taking lens group is EFL, which satisfies the following relationship: 5<f45/EFL<42.

The present invention further provides an optical imaging lens group, which includes a first lens, a second lens, a third lens, an aperture, a fourth lens, a fifth lens, a sixth lens, a seventh lens and Eighth lens. Among them, the first lens has negative refractive power, and its image side is concave; the second lens has negative refractive power, and its object side is concave and its image side is concave; the third lens has positive refractive power, and its object side is The convex surface and the image side are convex; the fourth lens has negative refractive power, and its object side is concave; the fifth lens has positive refractive power, and its image side is convex, wherein the fourth lens and the fifth lens form a cemented lens The sixth lens has positive refractive power, and its image side is convex; the seventh lens has negative refractive power, and its object side is concave, and its image side is convex, wherein the sixth lens and the seventh lens form a cemented lens; and the eighth lens, which has a positive refractive power, and whose object side is convex; wherein, the total number of lenses in the optical imaging lens group is eight; wherein, the focal length of the third lens is f3, and the distance between the fourth lens and the fifth lens is f3. The combined focal length is f45, and the effective focal length of the overall optical image pickup lens group is EFL, which satisfies the following relational expressions: 1<f3/EFL<5; and 5<f45/EFL<42.

Further, according to an embodiment of the present invention, the focal length of the third lens is f3, and the focal length of the eighth lens is f8, which satisfy the following relationship: 2<f8/f3<6.

According to an embodiment of the present invention, the distance on the optical axis from the object side of the first lens of the optical imaging lens group to the imaging surface of the optical imaging lens group is TTL, and the effective focal length of the overall optical imaging lens group is EFL , which satisfies the following relation: 7<TTL/EFL<9.5.

According to an embodiment of the present invention, the curvature radius of the image side surface of the seventh lens is R14, and the curvature radius of the object side surface of the eighth lens is R15, which satisfy the following relationship: -3<R15/R14<-0.7.

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: 0.2<f1/f2<1.2.

According to an embodiment of the present invention, the distance on the optical axis from the image side of the second lens to the object side of the third lens is AT23, and the thickness of the second lens on the optical axis is CT2, which satisfies the following relationship: 0.3<AT23 /CT2<0.9.

According to an embodiment of the present invention, the combined focal length of the sixth lens and the seventh lens is f67, and the effective focal length of the overall optical imaging lens group is EFL, which satisfies the following relationship: 3<f67/EFL<8.

According to an embodiment of the present invention, the distance on the optical axis from the image side of the seventh lens to the object side of the eighth lens is AT78, and the effective focal length of the overall optical image taking lens group is EFL, which satisfies the following relationship: 0.2<AT78/ EFL<0.8.

According to an embodiment of the present invention, the dispersion coefficient of the fourth lens is Vd4, the dispersion coefficient of the fifth lens is Vd5, the dispersion coefficient of the sixth lens is Vd6, and the dispersion coefficient of the seventh lens is Vd7, which satisfy the following relationship: Vd4<Vd5; Vd6>Vd7; 40<Vd4+Vd7<55; 90<Vd5+Vd6<130.

According to an embodiment of the present invention, the dispersion coefficient of the eighth lens is Vd8, which satisfies the following relational formula: 45<Vd8<90.

According to an embodiment of the present invention, the curvature radius of the object side surface of the eighth lens is R15, and the curvature radius of the image side surface is R16, which satisfy the following relationship: 2<R16/R15<5.

According to an embodiment of the present invention, the refractive index of the third lens is Nd3, and the refractive index of the seventh lens is Nd7, which satisfy the following relationship: Nd3>1.75; and Nd7>1.75.

The present invention further provides an optical imaging lens group, which sequentially includes from the object side to the image side: a first lens, a second lens, a third lens, an aperture, a fourth lens, a fifth lens, a sixth lens, and a seventh lens and the eighth lens. Among them, the first lens has negative refractive power, and its image side is concave; the second lens has negative refractive power, and its object side is concave and its image side is concave; the third lens has positive refractive power, and its object side is The convex surface and the image side are convex; the fourth lens has negative refractive power, and its object side is concave; the fifth lens has positive refractive power, and its image side is convex, wherein the fourth lens and the fifth lens constitute a A cemented lens; the sixth lens has positive refractive power, and its image side is convex; the seventh lens has negative refractive power, and its object side is concave and its image side is convex, wherein the sixth lens and the seventh lens constitute A cemented lens; and an eighth lens, having a positive refractive power, the object side is convex, and the image side is concave; wherein, the object side of the first lens of the optical imaging lens group to the imaging surface of the optical imaging lens group The distance on the optical axis is TTL, and the effective focal length of the optical imaging lens group is EFL, which satisfies the following relationship: 7<TTL/EFL<9.5.

The present invention further provides an imaging device, comprising 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 comprising the aforementioned imaging device.

In the following embodiments, each lens of the optical imaging lens group can be made of 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; in addition, due to the temperature change resistance and high hardness of the glass material itself, the impact of environmental changes on the optical imaging lens group can be reduced, thereby extending the optical The service life of the imaging 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 the embodiment of the present invention, each lens includes an object side facing the subject, and an image side facing the imaging surface. The surface shape of each lens is defined according to the shape of the surface near the optical axis (paraxial region). For example, when describing a lens as having a convex object side, it means that the object side of the lens is convex near the optical axis. , that is, although the lens surface is described as convex in the embodiments, the surface may be convex or concave in the region away from the optical axis (off-axis). The shape at the paraxial position of each lens is judged by whether the radius of curvature of the surface is positive or negative. For example, if the radius of curvature of the side of a lens is positive, the side of the object is convex; If the radius of curvature is negative, the sides of the object are concave. As far as the image side of a lens is concerned, if its curvature radius is positive, the image side is concave; on the contrary, if its curvature radius is negative, the image side is convex.

In embodiments of the present invention, the object side and the image side of each lens may be spherical or aspherical surfaces. The use of aspheric surfaces on the lens helps to correct imaging aberrations such as spherical aberrations in the optical imaging lens group, reducing the number of optical lens elements used. However, the use of an aspherical lens increases the cost of the overall optical image pickup lens assembly. Although in the embodiments of the present invention, the surfaces of some optical lenses use spherical surfaces, they can still be designed as aspherical surfaces as needed; Design it as a spherical surface.

In the embodiment of the present invention, the total track length TTL (Total Track Length) of the optical imaging lens group is defined as the distance on the optical axis from the object side of the first lens of the optical imaging lens group to the imaging surface. 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 half. In the following embodiments, the units of curvature radius, lens thickness, distance between lenses, lens group total 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 includes a first lens, a second lens, a third lens, an aperture, a fourth lens, a fifth lens, a sixth lens, a seventh lens and a first lens in sequence from the object side to the image side Eight lenses. Wherein, the first lens has negative refractive power, and its image side is concave; the second lens has negative refractive power, and its object side is concave and its image side is concave; the third lens has positive refractive power, and its object side is convex, and its image side is concave. The side is convex; the fourth lens has negative refractive power, and its object side is concave; the fifth lens has positive refractive power, and its image side is convex, wherein the fourth lens and the fifth lens form a cemented lens; the sixth lens has Positive refractive power, its image side is convex; the seventh lens has negative refractive power, its object side is concave, and its image side is convex, wherein the sixth lens and the seventh lens form a cemented lens; The eighth lens has positive refractive power , the object side surface is convex; the number of lens groups of this optical imaging lens group is eight.

Both the first lens and the second lens have negative refractive power and are used as lenses for expanding the light receiving range. The image side surface of the first lens is concave, which is beneficial to change the traveling direction of light. The second lens is a double-concave lens, which helps to further smooth the angle of the light rays, so that the light transmission path is closer to the optical axis, and the imaging aberration can be reduced. Preferably, the object side of the first lens is convex or flat.

The third lens has a positive refractive power, and both the object side and the image side are convex for condensing light. The object side surface of the third lens has a convex shape, which cooperates with the concave image side surface of the second lens to reduce field curvature aberration. The aperture is arranged behind the third lens, so that the effective optical radius of the optical lens of the optical imaging lens group can be prevented from being too large, and the volume of the overall optical imaging lens group can be reduced.

The fourth lens has a negative refractive power, the fifth lens has a positive refractive power, the dispersion coefficient of the fifth lens is higher than that of the fourth lens, and the image side of the fourth lens and the object side of the fifth lens are bonded to each other to form a glue lens. The cemented lens formed by the fourth lens and the fifth lens has the effect of eliminating chromatic aberration in imaging, which is helpful for improving imaging quality. The object side of the fourth lens is concave, and the third lens and the third lens having a biconvex shape are respectively disposed on both sides of the aperture to help correct coma aberration. The fourth lens having the shape of a concave lens is disposed behind the aperture, which can also reduce distortion aberration.

The sixth lens has a positive refractive power, the seventh lens has a negative refractive power, the dispersion coefficient of the sixth lens is higher than that of the seventh lens, and the image side of the sixth lens and the object side of the seventh lens are bonded to each other to form a glue lens. The cemented lens formed by the sixth lens and the seventh lens can further eliminate chromatic aberration and spherical aberration.

The eighth lens has a positive refractive power, and its object side is convex, while the image side of the seventh lens is convex, and there is an air gap between the two, and the seventh lens and the eighth lens have opposite refractive powers, which is conducive to further reduction. Field curvature aberration.

The focal length of the third lens of the optical imaging lens group is f3, and the focal length of the eighth lens is f8, which satisfy the following relationship:

2<f8/f3<6; (1)

By satisfying the condition of the relational expression (1), the refractive power ratio of the third lens and the eighth lens can be controlled, so that the third lens can be used as a lens that mainly controls the optical path, and the eighth lens can be used to correct aberrations. If f8/f3 is lower than the lower limit of relational formula (1), the refractive power of the eighth lens is too large, which is likely to cause the image height to be reduced and the back focal length to be too short; if f8/f3 is higher than the upper limit of relational formula (1) value, it is not conducive to correcting aberrations.

Between the focal length f3 of the third lens of the optical imaging lens group, and the effective focal length EFL of the overall optical imaging lens group, the following relationship is satisfied:

1 < f3/EFL < 5; (2)

By satisfying the condition of the relational expression (2), the third lens can have an appropriate positive refractive power to adjust the light path of the optical imaging lens group, which is beneficial to reduce the volume of the optical imaging lens group while maintaining the good optical properties.

The combined focal length of the fourth lens and the fifth lens of the optical image-taking lens group is f45, and the following relationship is satisfied between it and the effective focal length EFL of the overall optical image-taking lens group:

5<f45/EFL<42; (3)

By satisfying the condition of relational expression (3), the cemented lens composed of the fourth lens element and the fifth lens element has positive refractive power and relatively weak refractive power, so it will not change the traveling direction of the light excessively.

Preferably, the distance from the object side of the first lens of the optical imaging lens group to the imaging surface on the optical axis is TTL, and between it and the effective focal length EFL of the overall optical imaging lens group, the following relationship is satisfied:

7<TTL/EFL<9.5; (4)

By satisfying the condition of the relational expression (4), the volume of the optical imaging lens group can be controlled, which is beneficial to the miniaturization of the optical imaging lens group.

The curvature radius of the image side surface of the seventh lens of the optical imaging lens group is R14, and the curvature radius of the object side surface of the eighth lens is R15, and the relationship between the two satisfies the following relationship:

-3 < R15/R14 < -0.7; (5)

By satisfying the condition of the relational expression (5), the corresponding shapes between the image side surface of the seventh lens and the object side surface of the eighth lens can be controlled, which helps to reduce field curvature aberration.

The focal length of the first lens of the optical imaging lens group is f1, and the focal length of the second lens is f2, and the relationship between the two satisfies the following relationship:

0.2 < f1/f2 < 1.2; (6)

By satisfying the condition of the relational expression (6), the negative refractive power of the front end of the optical imaging lens group can be properly distributed to the first lens and the second lens, which is helpful to collect incident light rays with a large angle and increase the back focal length. length and reduce imaging aberrations.

The distance on the optical axis from the image side of the second lens to the object side of the third lens of the optical imaging lens group is AT23, and the thickness of the second lens on the optical axis is CT2, which satisfies the following relationship:

0.3＜AT23/CT2＜0.9; (7)

By satisfying the condition of the relational expression (7), a proper distance can be maintained between the image side surface of the second lens and the object side surface of the third lens, which helps to correct field curvature aberration and spherical aberration.

The combined focal length of the sixth lens and the seventh lens of the optical image-taking lens group is f67, and between it and the effective focal length EFL of the overall optical image-taking lens group, the following relationship is satisfied:

3<f67/EFL<8; (8)

By satisfying the condition of relational expression (8), the combined focal length of the sixth lens and the seventh lens can have an appropriate positive refractive power, and the path of the light after passing through the aperture can be adjusted, so that the optical imaging lens group has an appropriate Imaging is high.

The distance on the optical axis from the seventh lens image side of the optical imaging lens group to the eight-lens object side surface is AT78, and the effective focal length between it and the overall optical imaging lens group is EFL, which satisfies the following relational formula:

0.2 < AT78/EFL < 0.8; (9)

By satisfying the condition of the relational expression (9), an appropriate distance can be maintained between the seventh lens element and the eighth lens element, which is helpful for correcting field curvature aberration.

The dispersion coefficient of the fourth lens of the optical imaging lens group is Vd4, the dispersion coefficient of the fifth lens is Vd5, the dispersion coefficient of the sixth lens is Vd6, and the dispersion coefficient of the seventh lens is Vd7, which satisfies the following relational formula:

Vd4 < Vd5; (10)

Vd6>Vd7; (11)

40<Vd4+Vd7<55; (12)

90<Vd5+Vd6<130; (13)

By satisfying the conditions of the relational expressions (10) to (13), it is beneficial to correct the chromatic aberration of the optical imaging lens group.

The dispersion coefficient of the eighth lens of the optical imaging lens group is Vd8, which satisfies the following relationship:

45 < Vd8 < 90; (14)

By satisfying the condition of the relational expression (14), it is favorable to select a low-dispersion lens material as the eighth lens, which can further reduce the chromatic aberration of the optical imaging lens group.

Preferably, the curvature radius of the object side surface of the eighth lens of the optical imaging lens group is R15, and the curvature radius of the image side surface is R16, which satisfy the following relationship:

2<R16/R15<5; (15)

By satisfying the condition of the relational expression (15), it is favorable for the eighth lens to have the shape of a convex-concave lens, and the imaging aberration can be further corrected.

The refractive index of the third lens of the optical imaging lens group is Nd3, and the refractive index of the seventh lens is Nd7, which satisfy the following relationship:

Nd3>1.75; (16) and

Nd7>1.75; (17)

By satisfying the conditions of the relational expressions (16) and (17), the third lens and the seventh lens can have a high refractive index, which is beneficial to reduce the curvature of the lens surface and reduce the 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 a longitudinal spherical aberration diagram (Longitudinal Spherical Aberration), an astigmatic field curvature diagram (Astigmatism/Field Curvature) and a distortion aberration diagram (Distortion) in order from left to right.

As shown in FIG. 1A , the optical imaging lens group 100 of the first embodiment includes a first lens 101 , a second lens 102 , a third lens 103 , an aperture ST, a fourth lens 104 , a A five lens 105 , a sixth lens 106 , a seventh lens 107 and an eighth lens 108 . The optical imaging lens set 100 may further include a filter element 109 , a protective glass 110 and an imaging surface 111 . An image sensing element 120 can be further disposed on the imaging surface 111 to form an imaging device (not marked).

The first lens 101 has a negative refractive power, the object side 101a is convex, the image side 101b is concave, and both the object side 101a and the image side 101b are spherical. The material of the first lens 101 is glass.

The second lens 102 has a negative refractive power, the object side 102a is concave, the image side 102b is concave, and both the object side 102a and the image side 102b are spherical. The material of the second lens 102 is glass.

The third lens 103 has a positive refractive power, the object side 103a is convex, the image side 103b is convex, and both the object side 103a and the image side 103b are aspherical. The material of the third lens 103 is glass.

The fourth lens 104 has a negative refractive power, the object side 104a is concave, the image side 104b is concave, and both the object side 104a and the image side 104b are spherical. The material of the fourth lens 104 is glass.

The fifth lens 105 has a positive refractive power, the object side 105a is convex, the image side 105b is convex, and both the object side 105a and the image side 105b are spherical. The material of the fifth lens 105 is glass. The image side surface 104b of the fourth lens 104 and the object side surface 105a of the fifth lens 105 have the same curvature radius, and are bonded to each other to form a cemented lens.

The sixth lens 106 has a positive refractive power, the object side 106a is convex, the image side 106b is convex, and both the object side 106a and the image side 106b are spherical. The material of the sixth lens 106 is glass.

The seventh lens 107 has a negative refractive power, the object side 107a is concave, the image side 107b is convex, and the object side 107a and the image side 107b are spherical. The material of the seventh lens 107 is glass. The image side 106b of the sixth lens 106 and the object side 107a of the seventh lens 107 have the same curvature radius, and are bonded to each other to form a cemented lens.

The eighth lens 108 has a positive refractive power, the object side 108a is convex, the image side 108b is concave, and both the object side 108a and the image side 108b are aspherical. The material of the eighth lens 108 is glass.

The filter element 109 is disposed between the eighth lens 108 and the imaging surface 111 for filtering out light in a specific wavelength range, such as an infrared filter element (IR Filter). The two surfaces 109a and 109b of the filter element 109 are both flat surfaces, and the material is glass.

The protective glass 110 is disposed on the image sensing element 120 , the two surfaces 110 a and 110 b are both flat surfaces, and the material is glass.

The image sensor (Image Sensor) 120 is, for example, a Charge-Coupled Device (CCD) Image Sensor or a CMOS Image Sensor.

The curve equations of the above 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: the radius of curvature of the lens at the near optical axis;

K: cone factor; and

Ai: i-th order aspheric coefficient.

Please refer to Table 1 below, which is the detailed optical data of the optical imaging lens group 100 according to the first embodiment of the present invention. Wherein, the object side 101a of the first lens 101 is marked as the surface 101a, the image side 101b is marked as the surface 101b, and so on for other lens surfaces. 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 101a of the first lens 101 to the image side 101b is 1.451 mm, which means that the first lens 101 is on the optical axis. The thickness is 1.451 mm. The distance from the image side 101b of the first lens 101 to the object side 102a of the second lens 102 is 3.0 mm. Others can be deduced by analogy, and will not be repeated below.

In the first embodiment, the effective focal length of the optical imaging lens group 100 is EFL, the aperture value (F-number) is Fno, and half of the maximum viewing angle of the overall optical imaging lens group 100 is HFOV (Half Field of View). The distance from the object side surface 101a of the lens 101 to the imaging surface 110 on the optical axis I is the total length TTL. One half of the diagonal line of the effective sensing area of the image sensing element 120 on the imaging surface 110 is the maximum image height ImgH, and its value is as follows: EFL= 3.49 mm, Fno= 1.31, TTL= 32.25 mm, HFOV= 69 degrees, ImgH= 3.52 mm. The tables of the following embodiments correspond to the optical image pickup lens groups of the respective embodiments, and the definitions of the tables are the same as those of the present embodiment, so they will not be repeated in the following embodiments. first embodiment EFL= 3.49 mm , Fno = 1.31 , HFOV = 69 deg surface Surface type Radius of curvature (mm) Distance(mm) refractive index Dispersion coefficient Focal length (mm) material subject flat unlimited unlimited first lens 101a spherical 127.000 1.451 1.520 65.1 -7.73 grass 101b spherical 3.877 3.000 second lens 102a spherical -44.413 2.554 1.518 64.2 -24.07 grass 102b spherical 17.661 0.962 third lens 103a Aspherical 29.303 5.138 1.865 37.1 13.97 grass 103b Aspherical -18.890 0.400 aperture ST unlimited 0.000 fourth lens 104a spherical -12.696 1.314 1.703 30.1 -9.31 grass 104b (glue side) spherical 14.087 0.000 Fifth lens 105a (glued side) spherical 14.087 2.100 1.695 52.9 7.90 grass 105b spherical -8.453 0.448 sixth lens 106a spherical 50.000 4.335 1.702 51.1 8.99 grass 106b (glue side) spherical -6.964 0.000 seventh lens 107a (glued side) spherical -6.964 0.800 1.969 17.5 -31.97 grass 107b spherical -9.491 1.265 Eighth lens 108a Aspherical 13.587 4.001 1.497 81.6 41.87 grass 108b Aspherical 35.159 1.500 filter element 109a flat unlimited 0.210 1.517 64.2 grass 109b flat unlimited 1.898 protective glass 110a flat unlimited 0.500 1.517 64.2 grass 110b flat unlimited 0.371 Imaging plane 111 flat unlimited Reference wavelength: 555 nm Table I

Please refer to Table 2 below, which are the aspheric coefficients of the surfaces of the third lens and the eighth lens according to 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 taper coefficient K of the object side surface 103a of the third lens 103 is 21.1. Others can be deduced by analogy, and will not be repeated below. In addition, the tables of the following embodiments correspond to the optical image pickup lens groups of the respective embodiments, and the definitions of the tables are the same as those of the present embodiment, so they will not be repeated in the following embodiments. Aspheric coefficients of the first embodiment surface 103a 103b 108a 108b K 2.11E+01 2.17E+01 3.24E-01 4.74E+01 A ₂ 0.00E+00 0.00E+00 0.00E+00 0.00E+00 A ₄ 1.18E-04 1.14E-03 -2.10E-04 -5.09E-04 A ₆ 3.28E-05 3.62E-05 1.12E-06 -2.50E-06 A ₈ -9.17E-07 -3.92E-07 7.47E-08 8.68E-07 A ₁₀ -9.76E-08 1.02E-07 -2.41E-09 -5.07E-09 A ₁₂ -4.74E-09 -2.69E-09 1.01E-10 -9.45E-10 A ₁₄ 1.21E-09 2.70E-10 -9.97E-13 2.17E-11 Table II

In the first embodiment, the relationship between the focal length f3 of the third lens 103 and the focal length f8 of the eighth lens 108 is f8/f3=3.0.

In the first embodiment, the relationship between the focal length f3 of the third lens 103 and the effective focal length EFL of the overall optical imaging lens group 100 is f3/EFL=4.0.

In the first embodiment, the relationship between the combined focal length f45 of the cemented lens formed by the fourth lens 104 and the fifth lens 105 and the effective focal length EFL of the overall optical imaging lens group 100 is f45/EFL=8.06.

In the first embodiment, the relationship between the distance TTL on the optical axis from the object side surface 101a of the first lens 101 to the imaging surface 111 of the optical imaging lens group 100 and the effective focal length EFL of the overall optical imaging lens group 100 The formula is TTL/EFL=9.24.

In the first embodiment, the relationship between the curvature radius R14 of the image side surface 107b of the seventh lens 107 and the curvature radius R15 of the object side surface 108a of the eighth lens 108 is R15/R14=-1.43.

In the first embodiment, the relationship between the focal length f1 of the first lens 101 and the focal length f2 of the second lens 102 is f1/f2=0.32.

In the first embodiment, the relationship between the distance AT23 on the optical axis between the image side 102b of the second lens 102 and the object side 103a of the third lens 103 and the thickness CT2 of the second lens 102 on the optical axis is AT23/ CT2= 0.38.

In the first embodiment, the relationship between the combined focal length f67 of the cemented lens formed by the sixth lens 106 and the seventh lens 107 and the effective focal length EFL of the optical imaging lens group 100 is f67/EFL=3.75.

In the first embodiment, the relationship between the image side 107b of the seventh lens 107 and the object side 108a of the eighth lens 108 on the optical axis is AT78 and the relationship between the effective focal length EFL of the optical imaging lens group 100 is AT78/EFL =0.36.

In the first embodiment, the dispersion coefficients of the fourth lens 104, the fifth lens 105, the sixth lens 106 and the seventh lens 107 are respectively Vd4=30.1, Vd5=52.9, Vd6=51.1 and Vd7=17.5, and Vd4 +Vd7=47.6, Vd5+Vd6=104.0.

In the first embodiment, the dispersion coefficient of the eighth lens 108 is Vd8=81.6.

In the first embodiment, the relationship between the curvature radius R15 of the object side surface 108a of the eighth lens 108 and the curvature radius R16 of the image side surface 108b is R16/R15=2.59.

In the first embodiment, the refractive indices of the third lens 103 and the seventh lens 107 are Nd3=1.865 and Nd7=1.969, respectively.

From the numerical values of the above relational expressions, it can be known that the optical imaging lens group 10 of the first embodiment satisfies the requirements of relational expressions (1) to (17).

Referring to FIG. 1B , from left to right in the figure are the longitudinal spherical aberration diagram, the astigmatic field curvature diagram and the distortion aberration diagram of the optical imaging lens group 100 respectively. It can be seen from the longitudinal spherical aberration diagram that the off-axis light of the three visible light wavelengths of 470nm, 555nm and 650nm at different heights can be concentrated near the imaging point, and the deviation of the imaging point can be controlled within + 0.04mm. It can be seen from the astigmatic field curvature aberration diagram (wavelength 555nm) that the focal length variation of the sagittal aberration in the entire field of view is within + 0.02mm; the focal length of the meridional aberration in the entire field of view The variation is within + 0.02mm; and the distortion aberration can be controlled within 17%. As shown in FIG. 1B , the optical imaging lens assembly 100 of this embodiment has corrected various aberrations well, 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 a longitudinal spherical aberration diagram (Longitudinal Spherical Aberration), an astigmatism/Field Curvature diagram (Astigmatism/Field Curvature) and a distortion aberration diagram (Distortion) of the second embodiment of the present invention in order from left to right.

As shown in FIG. 2A , the optical imaging lens group 200 of the second embodiment includes a first lens 201 , a second lens 202 , a third lens 203 , an aperture ST, a fourth lens 204 , a A fifth lens 205 , a sixth lens 206 , a seventh lens 207 and an eighth lens 208 . The optical imaging lens set 200 may further include a filter element 209 , a protective glass 210 and an imaging surface 211 . An image sensing element 220 can be further disposed on the imaging surface 211 to form an imaging device (not marked).

The first lens 201 has a negative refractive power, the object side 201a is convex, the image side 201b is concave, and both the object side 201a and the image side 201b are spherical. The material of the first lens 201 is glass.

The second lens 202 has a negative refractive power, the object side 202a is concave, the image side 202b is concave, and both the object side 202a and the image side 202b are spherical. The material of the second lens 202 is glass.

The third lens 203 has a positive refractive power, the object side 203a is convex, the image side 203b is convex, and both the object side 203a and the image side 203b are aspherical. The material of the third lens 203 is glass.

The fourth lens 204 has a negative refractive power, the object side 204a is concave, the image side 204b is concave, and both the object side 204a and the image side 204b are spherical. The material of the fourth lens 204 is glass.

The fifth lens 205 has a positive refractive power, the object side 205a is convex, the image side 205b is convex, and both the object side 205a and the image side 205b are spherical. The material of the fifth lens 205 is glass. The image side surface 204b of the fourth lens 204 and the object side surface 205a of the fifth lens 205 have the same curvature radius, and are bonded to each other to form a cemented lens.

The sixth lens 206 has a positive refractive power, the object side 206a is convex, the image side 206b is convex, and both the object side 206a and the image side 206b are spherical. The material of the sixth lens 206 is glass.

The seventh lens 207 has a negative refractive power, the object side 207a is concave, the image side 207b is convex, and the object side 207a and the image side 207b are spherical. The material of the seventh lens 207 is glass. The image side surface 206b of the sixth lens 206 and the object side surface 207a of the seventh lens 207 have the same curvature radius, and are bonded to each other to form a cemented lens.

The eighth lens 208 has a positive refractive power, the object side 208a is convex, the image side 208b is convex, and both the object side 208a and the image side 208b are aspherical. The material of the eighth lens 208 is glass.

The filter element 209 is disposed between the eighth lens 208 and the imaging surface 211 for filtering out light in a specific wavelength range, such as an infrared filter element (IR Filter). Both surfaces 209a and 209b of the filter element 209 are flat surfaces, and the material is glass.

The protective glass 210 is disposed on the image sensing element 220 , the two surfaces 210 a and 210 b are both flat surfaces, and the material is glass.

The image sensor (Image Sensor) 220 is, for example, a Charge-Coupled Device (CCD) Image Sensor or a CMOS Image Sensor.

The detailed optical data and aspheric coefficient of the lens surface of the optical imaging lens group 200 of the second embodiment are listed in Tables 3 and 4, respectively. In the second embodiment, the curve equation of the aspheric surface is expressed as in the first embodiment. Second Embodiment EFL = 4.04 mm, Fno = 1.63, HFOV = 69 deg surface Surface type Radius of curvature (mm) Distance(mm) refractive index Dispersion coefficient Focal length (mm) material subject flat unlimited unlimited first lens 201a spherical 139.770 1.451 1.654 58.5 -7.44 grass 201b spherical 4.678 3.900 second lens 202a spherical -15.697 2.554 1.532 60.5 -12.63 grass 202b spherical 12.408 1.248 third lens 203a Aspherical 9.499 4.946 1.887 40.8 7.98 grass 203b Aspherical -20.923 0.717 aperture ST unlimited 0.000 fourth lens 204a spherical -32.428 1.314 1.811 25.4 -8.89 grass 204b (glued side) spherical 9.441 0.000 Fifth lens 205a (glued side) spherical 9.441 1.797 1.696 53.2 7.24 grass 205b spherical -9.971 0.448 sixth lens 206a spherical 280.000 3.457 1.642 59.7 12.00 grass 206b (glue side) spherical -7.892 0.000 seventh lens 207a (glued side) spherical -7.892 0.600 1.811 25.4 -29.96 grass 207b spherical -12.087 3.141 Eighth lens 208a Aspherical 33.942 2.367 1.773 49.6 39.05 grass 208b Aspherical -271.738 1.000 filter element 209a flat unlimited 0.210 1.517 64.2 grass 209b flat unlimited 1.000 protective glass 210a flat unlimited 0.500 1.517 64.2 grass 210b flat unlimited 1.743 Imaging plane 211 flat unlimited Reference wavelength: 555 nm Table 3 Aspheric coefficients of the second embodiment surface 203a 203b 208a 208b K -2.90E-01 2.95E+01 1.05E+01 2.54E+03 A ₂ 0.00E+00 0.00E+00 0.00E+00 0.00E+00 A ₄ 2.58E-05 1.06E-03 -1.02E-04 -3.65E-05 A ₆ 1.03E-05 2.79E-05 -9.55E-06 -5.43E-06 A ₈ -2.13E-07 -1.17E-06 5.75E-07 4.63E-07 A ₁₀ 1.03E-08 2.28E-07 8.00E-10 1.25E-08 A ₁₂ 2.94E-10 4.87E-09 -4.13E-10 -4.17E-10 A ₁₄ -1.87E-11 -5.53E-10 -1.39E-12 -1.22E-11 Table 4

In the second embodiment, the numerical values of the relational expressions of the optical imaging lens group 200 are listed in Table 5. It can be seen from Table 5 that the optical imaging lens group 200 of the second embodiment satisfies the requirements of the relational expressions (1) to (14) and the relational expressions (16) to (17). relational Numerical value f8/f3 4.90 f3/EFL 1.98 f45/EFL 6.80 TTL/EFL 8.02 R15/R14 -2.81 f1/f2 0.59 AT23/CT2 0.49 f67/EFL 5.13 AT78/EFL 0.78 Vd4 25.4 Vd5 53.2 Vd6 59.7 Vd7 25.4 Vd4+Vd7 50.8 Vd5+Vd6 113.0 Vd8 49.6 R16/R15 -8.01 Nd3 1.887 Nd7 1.811 Table 5

Referring to FIG. 2B , from left to right in the figure are the longitudinal spherical aberration diagram, the astigmatic field curvature diagram and the distortion aberration diagram of the optical imaging lens group 200 respectively. It can be seen from the longitudinal spherical aberration diagram that the off-axis light of the three visible light wavelengths of 470nm, 555nm and 650nm at different heights can be concentrated near the imaging point, and the deviation of the imaging point can be controlled within + 0.04mm. It can be seen from the astigmatic field curvature aberration diagram (wavelength 555nm) that the focal length variation of the sagittal aberration in the entire field of view is within + 0.04mm; the aberration in the meridional direction is within the focal length of the entire field of view. The variation is within + 0.01mm; and the distortion aberration can be controlled within 16%. As shown in FIG. 2B , the optical imaging lens group 200 of this embodiment has corrected various aberrations well, 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 a longitudinal spherical aberration diagram (Longitudinal Spherical Aberration), an astigmatism/Field Curvature diagram (Astigmatism/Field Curvature) and a distortion aberration diagram (Distortion) of the third embodiment of the present invention in order from left to right.

As shown in FIG. 3A , the optical imaging lens group 300 of the third embodiment includes a first lens 301 , a second lens 302 , a third lens 303 , an aperture ST, a fourth lens 304 , a A five lens 305 , a sixth lens 306 , a seventh lens 307 and an eighth lens 308 . The optical imaging lens group 300 can further include a filter element 309 , a protective glass 310 and an imaging surface 311 . An image sensing element 320 can be further disposed on the imaging surface 311 to form an imaging device (not marked).

The first lens 301 has a negative refractive power, the object side 301a is convex, the image side 301b is concave, and both the object side 301a and the image side 301b are spherical. The material of the first lens 301 is glass.

The second lens 302 has a negative refractive power, the object side 302a is concave, the image side 302b is concave, and both the object side 302a and the image side 302b are spherical. The material of the second lens 302 is glass.

The third lens 303 has a positive refractive power, the object side 303a is convex, the image side 303b is convex, and both the object side 303a and the image side 303b are aspherical. The material of the third lens 303 is glass.

The fourth lens 304 has a negative refractive power, its object side 304a is concave, its image side 304b is flat, and its object side 304a is spherical. The material of the fourth lens 304 is glass.

The fifth lens 305 has a positive refractive power, the object side 305a is a plane, the image side 305b is convex, and the image side 305b is spherical. The material of the fifth lens 305 is glass. The image side 304b of the fourth lens 304 and the object side 305a of the fifth lens 305 are bonded to each other to form a cemented lens.

The sixth lens 306 has a positive refractive power, the object side 306a is concave, the image side 306b is convex, and both the object side 306a and the image side 306b are spherical. The material of the sixth lens 306 is glass.

The seventh lens 307 has negative refractive power, the object side 307a is concave, the image side 307b is convex, and the object side 307a and the image side 307b are spherical. The material of the seventh lens 307 is glass. The image side surface 306b of the sixth lens 306 and the object side surface 307a of the seventh lens 307 have the same curvature radius, and are bonded to each other to form a cemented lens.

The eighth lens 308 has a positive refractive power, the object side 308a is convex, the image side 308b is concave, and both the object side 308a and the image side 308b are aspherical. The material of the eighth lens 308 is glass.

The filter element 309 is disposed between the eighth lens 308 and the imaging surface 311 to filter out light in a specific wavelength range, for example, an infrared filter element (IR Filter). The two surfaces 309a and 309b of the filter element 309 are both flat surfaces, and the material is glass.

The protective glass 310 is disposed on the image sensing element 320 , the two surfaces 310 a and 310 b are both flat surfaces, and the material is glass.

The image sensor (Image Sensor) 320 is, for example, a Charge-Coupled Device (CCD) Image Sensor or a CMOS Image Sensor.

The detailed optical data and aspheric coefficient of the lens surface of the optical imaging lens group 300 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 as in the form of the first embodiment. Third Embodiment EFL = 4.83 mm, Fno = 1.73, HFOV = 71.3 deg surface Surface type Radius of curvature (mm) Distance(mm) refractive index Dispersion coefficient Focal length (mm) material subject flat unlimited unlimited first lens 301a spherical 173.000 1.451 1.513 60.4 -10.37 grass 301b spherical 5.145 4.300 second lens 302a spherical -14.344 2.339 1.522 69.7 -9.18 grass 302b spherical 7.590 1.226 third lens 303a Aspherical 8.002 4.549 1.887 39.2 7.18 grass 303b Aspherical -22.876 0.374 aperture ST unlimited 0.000 fourth lens 304a spherical -17.608 1.296 1.746 28.1 -23.62 grass 304b (glued side) spherical Infinity 0.000 Fifth lens 305a (glued side) spherical Infinity 1.801 1.700 48.5 13.62 grass 305b spherical -9.529 0.215 sixth lens 306a spherical -23.454 5.611 1.680 50.7 8.59 grass 306b (glued side) spherical -5.131 0.000 seventh lens 307a (glued side) spherical -5.131 0.743 1.969 17.5 -13.30 grass 307b spherical -9.131 2.645 Eighth lens 308a Aspherical 10.851 4.015 1.500 64.8 28.67 grass 308b Aspherical 37.688 1.500 filter element 309a flat unlimited 0.210 1.517 64.2 grass 309b flat unlimited 1.898 protective glass 310a flat unlimited 0.500 1.517 64.2 grass 310b flat unlimited 1.026 Imaging plane 311 flat unlimited Reference wavelength: 555 nm Table 6 Aspheric coefficients of the third embodiment surface 303a 303b 308a 308b K 6.52E-01 2.57E+01 1.72E+00 5.18E+01 A ₂ 0.00E+00 0.00E+00 0.00E+00 0.00E+00 A ₄ 1.41E-05 1.04E-03 -2.23E-05 1.57E-04 A ₆ 2.94E-06 2.75E-05 2.65E-06 1.22E-05 A ₈ 1.95E-07 -3.01E-07 1.04E-07 1.56E-07 A ₁₀ 1.85E-08 1.12E-07 -3.58E-09 7.36E-09 A ₁₂ -1.64E-09 1.22E-09 6.20E-11 -5.90E-10 A ₁₄ 3.89E-11 1.26E-10 -3.34E-13 2.38E-11 Table 7

In the third embodiment, the numerical values of the relational expressions of the optical imaging lens group 300 are listed in Table 8. It can be seen from Table 8 that the optical imaging lens group 300 of the third embodiment satisfies the requirements of the relational expressions (1) to (17). relational Numerical value f8/f3 3.99 f3/EFL 1.49 f45/EFL 5.65 TTL/EFL 7.39 R15/R14 -1.19 f1/f2 1.13 AT23/CT2 0.52 f67/EFL 7.06 AT78/EFL 0.55 Vd4 28.1 Vd5 48.5 Vd6 50.7 Vd7 17.5 Vd4+Vd7 45.6 Vd5+Vd6 99.2 Vd8 64.8 R16/R15 3.47 Nd3 1.887 Nd7 1.969 Table 8

Referring to FIG. 3B , from left to right in the figure are the longitudinal spherical aberration diagram, the astigmatic field curvature diagram and the distortion aberration diagram of the optical imaging lens group 300 respectively. It can be seen from the longitudinal spherical aberration diagram that the off-axis rays of the three visible light wavelengths of 470nm, 555nm and 650nm at different heights can be concentrated near the imaging point, and the deviation of the imaging point can be controlled within + 0.05mm. From the astigmatic field curvature aberration diagram (wavelength 555nm), it can be seen that the focal length variation of the sagittal aberration in the entire field of view is within + 0.03mm; the aberration in the meridional direction is within the focal length of the entire field of view. The variation is within + 0.04mm; and the distortion aberration can be controlled within 17%. As shown in FIG. 3B , the optical imaging lens group 300 of this embodiment has corrected various aberrations well, 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 a longitudinal spherical aberration diagram (Longitudinal Spherical Aberration), an astigmatism/Field Curvature diagram (Astigmatism/Field Curvature) and a distortion aberration diagram (Distortion) of the fourth embodiment of the present invention in order from left to right.

As shown in FIG. 4A , the optical imaging lens group 400 of the fourth embodiment includes a first lens 401 , a second lens 402 , a third lens 403 , an aperture ST, a fourth lens 404 , a A five lens 405 , a sixth lens 406 , a seventh lens 407 and an eighth lens 408 . The optical imaging lens set 400 may further include a filter element 409 , a protective glass 410 and an imaging surface 411 . An image sensing element 420 can be further disposed on the imaging surface 411 to form an imaging device (not marked).

The first lens 401 has a negative refractive power, the object side 401a is convex, the image side 401b is concave, and both the object side 401a and the image side 401b are spherical. The material of the first lens 401 is glass.

The second lens 402 has a negative refractive power, the object side 402a is concave, the image side 402b is concave, and both the object side 402a and the image side 402b are spherical. The material of the second lens 402 is glass.

The third lens 403 has a positive refractive power, the object side 403a is convex, the image side 403b is convex, and both the object side 403a and the image side 403b are aspherical. The material of the third lens 403 is glass.

The fourth lens 404 has negative refractive power, its object side 404a is concave, its image side 404b is flat, and its object side 404a is spherical. The material of the fourth lens 404 is glass.

The fifth lens 405 has a positive refractive power, the object side 405a is a plane, the image side 405b is convex, and the image side 405b is spherical. The material of the fifth lens 405 is glass. The image side surface 404b of the fourth lens 404 and the object side surface 405a of the fifth lens 405 have the same curvature radius, and are bonded to each other to form a cemented lens.

The sixth lens 406 has a positive refractive power, the object side 406a is concave, the image side 406b is convex, and both the object side 406a and the image side 406b are spherical. The material of the sixth lens 406 is glass.

The seventh lens 407 has a negative refractive power, the object side 407a is concave, the image side 407b is convex, and the object side 407a and the image side 407b are spherical. The material of the seventh lens 407 is glass. The image side surface 406b of the sixth lens 406 and the object side surface 407a of the seventh lens 407 have the same curvature radius, and are bonded to each other to form a cemented lens.

The eighth lens 408 has a positive refractive power, the object side 408a is convex, the image side 408b is concave, and both the object side 408a and the image side 408b are aspherical. The material of the eighth lens 408 is glass.

The filter element 409 is disposed between the eighth lens 408 and the imaging surface 411 , and is used for filtering out light in a specific wavelength range, such as an infrared filter element (IR Filter). The two surfaces 409a and 409b of the filter element 409 are both flat surfaces, and the material is glass.

The protective glass 410 is disposed on the image sensing element 420 , the two surfaces 410 a and 410 b are both flat surfaces, and the material is glass.

The Image Sensor 420 is, for example, a Charge-Coupled Device (CCD) Image Sensor or a CMOS Image Sensor.

The detailed optical data and aspheric coefficient of the lens surface of the optical imaging lens group 400 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 as in the first embodiment. Fourth Embodiment EFL = 4.11 mm, Fno = 1.55, HFOV = 75 deg surface Surface type Radius of curvature (mm) Distance(mm) refractive index Dispersion coefficient Focal length (mm) material subject flat unlimited unlimited first lens 401a spherical 120.000 1.451 1.519 69.6 -10.22 grass 401b spherical 5.055 4.266 second lens 402a spherical -10.443 2.608 1.524 60.4 -10.20 grass 402b spherical 11.898 1.259 third lens 403a Aspherical 10.205 4.910 1.868 40.6 8.37 grass 403b Aspherical -19.575 0.703 aperture ST unlimited 0.000 fourth lens 404a spherical -16.719 1.247 1.722 29.5 -23.16 grass 404b (glued side) spherical infinity 0.000 Fifth lens 405a (glued side) spherical Infinity 1.723 1.693 54.8 14.84 grass 405b spherical -10.288 0.550 sixth lens 406a spherical -367.520 4.788 1.699 55.5 8.64 grass 406b (glued side) spherical -5.974 0.000 seventh lens 407a (glued side) spherical -5.974 0.492 1.969 17.5 -18.06 grass 407b spherical -9.437 2.872 Eighth lens 408a Aspherical 13.561 4.038 1.517 64.3 38.45 grass 408b Aspherical 38.143 1.500 filter element 409a flat unlimited 0.210 1.517 64.2 grass 409b flat unlimited 1.000 protective glass 410a flat unlimited 0.500 1.517 64.2 grass 410b flat unlimited 0.253 Imaging plane 411 flat unlimited Reference wavelength: 555 nm Table 9 Aspheric coefficients of the fourth embodiment surface 403a 403b 408a 408b K 7.97E-01 2.30E+01 1.77E+00 4.67E+01 A ₂ 0.00E+00 0.00E+00 0.00E+00 0.00E+00 A ₄ 4.93E-05 1.09E-03 -1.16E-04 -9.91E-05 A ₆ 2.90E-06 2.98E-05 -5.55E-07 1.37E-06 A ₈ -2.13E-07 -5.93E-07 2.39E-07 6.41E-07 A ₁₀ 1.80E-08 1.11E-07 -3.55E-09 4.51E-09 A ₁₂ 1.54E-09 8.20E-11 3.37E-12 -5.39E-10 A ₁₄ -1.23E-10 2.74E-11 4.35E-13 1.36E-11 Table 10

In the fourth embodiment, the numerical values of the relational expressions of the optical imaging lens group 400 are listed in Table 11. It can be seen from Table 11 that the optical imaging lens group 400 of the fourth embodiment satisfies the requirements of the relational expressions (1) to (17). relational Numerical value f8/f3 4.59 f3/EFL 2.04 f45/EFL 8.31 TTL/EFL 8.36 R15/R14 -1.44 f1/f2 1.00 AT23/CT2 0.48 f67/EFL 4.26 AT78/EFL 0.70 Vd4 29.5 Vd5 54.8 Vd6 55.5 Vd7 17.5 Vd4+Vd7 47.0 Vd5+Vd6 110.3 Vd8 64.3 R16/R15 2.81 Nd3 1.868 Nd7 1.969 Table 11

Referring to FIG. 4B , from left to right in the figure are the longitudinal spherical aberration diagram, the astigmatic field curvature diagram and the distortion aberration diagram of the optical imaging lens group 400 respectively. It can be seen from the longitudinal spherical aberration diagram that the off-axis light of the three visible light wavelengths of 470nm, 555nm and 650nm at different heights can be concentrated near the imaging point, and the deviation of the imaging point can be controlled within + 0.03mm. It can be seen from the astigmatic field curvature aberration diagram (wavelength 555nm) that the focal length variation of the sagittal aberration in the entire field of view is within + 0.02mm; the focal length of the meridional aberration in the entire field of view 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 400 of this embodiment has corrected various aberrations well, 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. 5B is a longitudinal spherical aberration diagram (Longitudinal Spherical Aberration), an astigmatism/Field Curvature diagram (Astigmatism/Field Curvature) and a distortion aberration diagram (Distortion) of the fifth embodiment of the present invention in order from left to right.

As shown in FIG. 5A , the optical imaging lens group 500 of the fifth embodiment includes a first lens 501 , a second lens 502 , a third lens 503 , an aperture ST, a fourth lens 504 , a A five lens 505 , a sixth lens 506 , a seventh lens 507 and an eighth lens 508 . The optical imaging lens set 500 may further include a filter element 509 , a protective glass 510 and an imaging surface 511 . An image sensing element 520 can be further disposed on the imaging surface 511 to form an imaging device (not marked).

The first lens 501 has a negative refractive power, the object side 501a is convex, the image side 501b is concave, and both the object side 501a and the image side 501b are spherical. The material of the first lens 501 is glass.

The second lens 502 has a negative refractive power, the object side 502a is concave, the image side 502b is concave, and both the object side 502a and the image side 502b are spherical. The material of the second lens 502 is glass.

The third lens 503 has a positive refractive power, the object side 503a is convex, the image side 503b is convex, and both the object side 503a and the image side 503b are aspherical. The material of the third lens 503 is glass.

The fourth lens 504 has a negative refractive power, its object side 504a is concave, its image side 504b is concave, and its object side 504a and image side 504b are both spherical. The material of the fourth lens 504 is glass.

The fifth lens 505 has a positive refractive power, the object side 505a is convex, the image side 505b is convex, and both the object side 505a and the image side 505b are spherical. The material of the fifth lens 505 is glass. The image side surface 504b of the fourth lens 504 and the object side surface 505a of the fifth lens 505 have the same curvature radius, and are bonded to each other to form a cemented lens.

The sixth lens 506 has a positive refractive power, the object side 506a is convex, the image side 506b is convex, and both the object side 506a and the image side 506b are spherical. The material of the sixth lens 506 is glass.

The seventh lens 507 has a negative refractive power, the object side 507a is concave, the image side 507b is convex, and the object side 507a and the image side 507b are spherical. The material of the seventh lens 507 is glass. The image side surface 506b of the sixth lens 506 and the object side surface 507a of the seventh lens 507 have the same curvature radius, and are bonded to each other to form a cemented lens.

The eighth lens 508 has a positive refractive power, its object side 508a is convex, its image side 508b is concave, and its object side 508a and image side 508b are both aspherical. The material of the eighth lens 508 is glass.

The filter element 509 is disposed between the eighth lens 508 and the imaging surface 511 for filtering out light in a specific wavelength range, such as an infrared filter element (IR Filter). The two surfaces 509a and 509b of the filter element 509 are both flat surfaces, and the material is glass.

The protective glass 510 is disposed on the image sensing element 520 , the two surfaces 510 a and 510 b are both flat surfaces, and the material is glass.

The image sensor (Image Sensor) 520 is, for example, a Charge-Coupled Device (CCD) Image Sensor or a CMOS Image Sensor.

The detailed optical data and the aspheric coefficient of the lens surface of the optical imaging lens group 500 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 as in the form of the first embodiment. Fifth Embodiment EFL = 2.92 mm, Fno = 1.23, HFOV = 71.3 deg surface Surface type Radius of curvature (mm) Distance(mm) refractive index Dispersion coefficient Focal length (mm) material subject flat unlimited unlimited first lens 501a spherical 100.000 1.451 1.605 60.7 -7.31 grass 501b spherical 4.210 3.734 second lens 502a spherical -13.437 1.500 1.558 58.7 -7.21 grass 502b spherical 5.976 1.248 third lens 503a Aspherical 7.937 2.250 1.868 40.6 7.00 grass 503b Aspherical -22.421 0.717 aperture ST unlimited 0.000 fourth lens 504a spherical -15.091 1.314 1.746 27.8 -16.05 grass 504b (glued side) spherical 59.946 0.000 Fifth lens 505a (glued side) spherical 59.946 1.797 1.775 49.6 9.11 grass 505b spherical -7.897 0.800 sixth lens 506a spherical 14.735 4.000 1.654 58.5 5.54 grass 506b (glue side) spherical -4.288 0.000 seventh lens 507a (glued side) spherical -4.288 0.600 1.866 22.7 -9.32 grass 507b spherical -9.745 0.800 Eighth lens 508a Aspherical 12.768 3.000 1.498 65.0 38.36 grass 508b Aspherical 35.247 1.000 filter element 509a flat unlimited 0.210 1.517 64.2 grass 509b flat unlimited 1.000 protective glass 510a flat unlimited 0.500 1.517 64.2 grass 510b flat unlimited 0.425 Imaging plane 511 flat unlimited Reference wavelength: 555 nm Table 12 Aspheric coefficients of the fifth embodiment surface 503a 503b 508a 508b K -5.81E-01 3.32E+01 -9.63E+00 -1.56E+02 A ₂ 0.00E+00 0.00E+00 0.00E+00 0.00E+00 A ₄ 1.24E-05 1.05E-03 -7.22E-05 -4.30E-06 A ₆ 5.56E-06 3.13E-05 -2.89E-06 1.16E-05 A ₈ 2.92E-08 -4.85E-07 5.28E-08 2.77E-07 A ₁₀ 1.05E-08 1.15E-07 -1.13E-08 -8.00E-10 A ₁₂ 1.84E-10 2.28E-11 -9.25E-11 -2.20E-09 A ₁₄ -8.04E-11 -2.27E-13 2.27E-11 -2.90E-10 Table 13

In the fifth embodiment, the numerical values of the relational expressions of the optical imaging lens group 500 are listed in Table 14. It can be seen from Table 14 that the optical imaging lens group 500 of the fifth embodiment satisfies the requirements of the relational expressions (1) to (17). relational Numerical value f8/f3 5.48 f3/EFL 2.40 f45/EFL 5.93 TTL/EFL 9.02 R15/R14 -1.31 f1/f2 1.01 AT23/CT2 0.83 f67/EFL 4.31 AT78/EFL 0.27 Vd4 27.8 Vd5 49.6 Vd6 58.5 Vd7 22.7 Vd4+Vd7 50.5 Vd5+Vd6 108.1 Vd8 65.0 R16/R15 2.76 Nd3 1.868 Nd7 1.866 Table 14

Referring to FIG. 5B , from left to right in the figure are the longitudinal spherical aberration diagram, the astigmatic field curvature diagram and the distortion aberration diagram of the optical imaging lens group 500 respectively. It can be seen from the longitudinal spherical aberration diagram that the off-axis light of the three visible light wavelengths of 470nm, 555nm and 650nm at different heights can be concentrated near the imaging point, and the deviation of the imaging point can be controlled within + 0.04mm. From the astigmatic field curvature aberration diagram (wavelength 555nm), it can be seen that the focal length variation of the sagittal aberration in the entire field of view is within + 0.01mm; the meridional aberration is within the focal length of the entire field of view. The variation is within + 0.04mm; and the distortion aberration can be controlled within 18%. As shown in FIG. 5B , the optical imaging lens group 500 of this embodiment has corrected various aberrations well, and meets the imaging quality requirements of the optical system. Sixth Embodiment

Referring to FIGS. 6A and 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 a longitudinal spherical aberration diagram (Longitudinal Spherical Aberration), an astigmatism/Field Curvature diagram (Astigmatism/Field Curvature) and a distortion aberration diagram (Distortion) of the sixth embodiment of the present invention in order from left to right.

As shown in FIG. 6A , the optical imaging lens group 600 of the sixth embodiment includes a first lens 601 , a second lens 602 , a third lens 603 , an aperture ST, a fourth lens 604 , a A fifth lens 605 , a sixth lens 606 , a seventh lens 607 and an eighth lens 608 . The optical imaging lens set 600 may further include a filter element 609 , a protective glass 610 and an imaging surface 611 . An image sensing element 620 can be further disposed on the imaging surface 611 to form an imaging device (not marked).

The first lens 601 has a negative refractive power, the object side 601a is convex, the image side 601b is concave, and both the object side 601a and the image side 601b are spherical. The material of the first lens 601 is glass.

The second lens 602 has a negative refractive power, the object side 602a is concave, the image side 602b is concave, and both the object side 602a and the image side 602b are spherical. The material of the second lens 602 is glass.

The third lens 603 has a positive refractive power, the object side 603a is convex, the image side 603b is convex, and both the object side 603a and the image side 603b are aspherical. The material of the third lens 603 is glass.

The fourth lens 604 has negative refractive power, its object side 604a is concave, its image side 604b is flat, and its object side 604a is spherical. The material of the fourth lens 604 is glass.

The fifth lens 605 has a positive refractive power, the object side 605a is a plane, the image side 605b is convex, and the image side 605b is spherical. The material of the fifth lens 605 is glass. The image side surface 604b of the fourth lens 604 and the object side surface 605a of the fifth lens 605 have the same curvature radius, and are bonded to each other to form a cemented lens.

The sixth lens 606 has a positive refractive power, the object side 606a is concave, the image side 606b is convex, and both the object side 606a and the image side 606b are spherical. The material of the sixth lens 606 is glass.

The seventh lens 607 has negative refractive power, the object side 607a is concave, the image side 607b is convex, and the object side 607a and the image side 607b are spherical. The material of the seventh lens 607 is glass. The image side surface 606b of the sixth lens 606 and the object side surface 607a of the seventh lens 607 have the same curvature radius, and are bonded to each other to form a cemented lens.

The eighth lens 608 has a positive refractive power, the object side 608a is convex, the image side 608b is concave, and both the object side 608a and the image side 608b are aspherical. The material of the eighth lens 608 is glass.

The filter element 609 is disposed between the eighth lens 608 and the imaging surface 611 for filtering out light in a specific wavelength range, such as an infrared filter element (IR Filter). The two surfaces 609a and 609b of the filter element 609 are both flat surfaces, and the material is glass.

The protective glass 610 is disposed on the image sensing element 620 , the two surfaces 610 a and 610 b are both flat surfaces, and the material is glass.

The image sensor (Image Sensor) 620 is, for example, a Charge-Coupled Device (CCD) Image Sensor or a CMOS Image Sensor.

The detailed optical data and aspheric coefficient of the lens surface of the optical imaging lens group 600 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 as in the form of the first embodiment. Sixth Embodiment EFL = 3.93 mm, Fno = 1.44, HFOV = 71.3 deg surface Surface type Radius of curvature (mm) Distance(mm) refractive index Dispersion coefficient Focal length (mm) material subject flat unlimited unlimited first lens 601a spherical 210.000 1.451 1.554 63.4 -8.42 grass 601b spherical 4.553 4.018 second lens 602a spherical -15.432 2.195 1.512 63.4 -11.50 grass 602b spherical 9.966 1.229 third lens 603a Aspherical 8.026 4.000 1.888 37.2 7.28 grass 603b Aspherical -25.529 0.611 aperture ST unlimited 0.000 fourth lens 604a spherical -10.467 1.314 1.746 27.6 -14.04 grass 604b (glued side) spherical Infinity 0.000 Fifth lens 605a (glued side) spherical Infinity 1.797 1.723 50.4 11.11 grass 605b spherical -8.026 1.215 sixth lens 606a spherical -525.655 2.163 1.720 48.0 7.66 grass 606b (glued side) spherical -5.463 0.000 seventh lens 607a (glued side) spherical -5.463 0.600 1.932 18.9 -12.03 grass 607b spherical -11.226 1.764 Eighth lens 608a Aspherical 10.122 2.546 1.497 81.1 25.21 grass 608b Aspherical 47.793 1.500 filter element 609a flat unlimited 0.210 1.517 64.2 grass 609b flat unlimited 1.898 protective glass 610a flat unlimited 0.500 1.517 64.2 grass 610b flat unlimited 0.979 Imaging plane 611 flat unlimited Reference wavelength: 555 nm Table 15 Aspheric coefficients of the sixth embodiment surface 603a 603b 608a 608b K 8.94E-01 -2.07E+00 1.90E+00 7.20E+01 A ₂ 0.00E+00 0.00E+00 0.00E+00 0.00E+00 A ₄ 2.12E-06 1.05E-03 -1.00E-04 -3.83E-05 A ₆ 5.95E-06 3.00E-05 -1.03E-06 9.78E-06 A ₈ -1.42E-09 -6.30E-07 2.36E-07 1.85E-07 A ₁₀ -1.58E-11 1.13E-07 -3.77E-09 6.56E-09 A ₁₂ -2.05E-10 1.79E-10 -1.43E-11 -2.74E-11 A ₁₄ 1.52E-11 9.52E-11 -7.48E-13 -2.10E-12 Table 16

In the sixth embodiment, the numerical values of the relational expressions of the optical imaging lens group 600 are listed in Table 17. It can be seen from Table 17 that the optical imaging lens group 600 of the sixth embodiment satisfies the requirements of the relational expressions (1) to (17). relational Numerical value f8/f3 3.46 f3/EFL 1.85 f45/EFL 8.40 TTL/EFL 7.63 R15/R14 -0.90 f1/f2 0.73 AT23/CT2 0.56 f67/EFL 5.79 AT78/EFL 0.45 Vd4 27.6 Vd5 50.4 Vd6 48.0 Vd7 18.9 Vd4+Vd7 46.5 Vd5+Vd6 98.4 Vd8 81.1 R16/R15 4.72 Nd3 1.888 Nd7 1.932 Table 17

Referring to FIG. 6B , from left to right in the figure are the longitudinal spherical aberration diagram, the astigmatic field curvature diagram and the distortion aberration diagram of the optical imaging lens group 600 respectively. It can be seen from the longitudinal spherical aberration diagram that the off-axis rays of the three visible light wavelengths of 470nm, 555nm and 650nm at different heights can be concentrated near the imaging point, and the deviation of the imaging point can be controlled within + 0.05mm. It can be seen from the astigmatic field curvature aberration diagram (wavelength 555nm) that the focal length variation of the sagittal aberration in the entire field of view is within + 0.04mm; the aberration in the meridional direction is within the focal length of the entire field of view. The variation is within + 0.05mm; and the distortion aberration can be controlled within 20%. As shown in FIG. 6B , the optical imaging lens group 600 of this embodiment has corrected various aberrations well, and meets the imaging quality requirements of the optical system. Seventh Embodiment

Referring to FIG. 7A and FIG. 7B , FIG. 7A is a schematic diagram of an optical imaging lens group according to a seventh embodiment of the present invention. 7B is a longitudinal spherical aberration diagram (Longitudinal Spherical Aberration), an astigmatic field curvature diagram (Astigmatism/Field Curvature) and a distortion aberration diagram (Distortion) in order from left to right.

As shown in FIG. 7A , the optical imaging lens group 700 of the seventh embodiment includes a first lens 701 , a second lens 702 , a third lens 703 , an aperture ST, a fourth lens 704 , a A fifth lens 705 , a sixth lens 706 , a seventh lens 707 and an eighth lens 708 . The optical imaging lens set 700 can further include a filter element 709 , a protective glass 710 and an imaging surface 711 . An image sensing element 720 can be further disposed on the imaging surface 711 to form an imaging device (not marked).

The first lens 701 has a negative refractive power, its object side 701a is flat, its image side 701b is concave, and its image side 701b is spherical. The material of the first lens 701 is glass.

The second lens 702 has a negative refractive power, the object side 702a is concave, the image side 702b is concave, and both the object side 702a and the image side 702b are spherical. The material of the second lens 702 is glass.

The third lens 703 has a positive refractive power, the object side 703a is convex, the image side 703b is convex, and both the object side 703a and the image side 703b are aspherical. The material of the third lens 703 is glass.

The fourth lens 704 has negative refractive power, its object side 704a is concave, its image side 704b is concave, and its object side 704a and image side 704b are both spherical. The material of the fourth lens 704 is glass.

The fifth lens 705 has a positive refractive power, the object side 705a is convex, the image side 705b is convex, and both the object side 705a and the image side 705b are spherical. The material of the fifth lens 705 is glass. The image side surface 704b of the fourth lens 704 and the object side surface 705a of the fifth lens 705 have the same curvature radius, and are bonded to each other to form a cemented lens.

The sixth lens 706 has a positive refractive power, the object side 706a is convex, the image side 706b is convex, and both the object side 706a and the image side 706b are spherical. The material of the sixth lens 706 is glass.

The seventh lens 707 has a negative refractive power, its object side 707a is concave, its image side 707b is convex, and its object side 707a and its image side 707b are spherical. The material of the seventh lens 707 is glass. The image side surface 706b of the sixth lens 706 and the object side surface 707a of the seventh lens 707 have the same curvature radius, and are bonded to each other to form a cemented lens.

The eighth lens 708 has a positive refractive power, the object side 708a is convex, the image side 708b is concave, and both the object side 708a and the image side 708b are aspherical. The material of the eighth lens 708 is glass.

The filter element 709 is disposed between the eighth lens 708 and the imaging surface 711 for filtering out light in a specific wavelength range, such as an infrared filter element (IR Filter). The two surfaces 709a and 709b of the filter element 709 are both flat surfaces, and the material is glass.

The protective glass 710 is disposed on the image sensing element 720 , the two surfaces 710 a and 710 b are both flat surfaces, and the material is glass.

The image sensor (Image Sensor) 720 is, for example, a Charge-Coupled Device (CCD) Image Sensor or a CMOS Image Sensor.

The detailed optical data and the aspheric coefficient of the lens surface of the optical imaging lens group 700 of the seventh embodiment are listed in Table 18 and Table 19, respectively. In the seventh embodiment, the curve equation of the aspheric surface is expressed as in the form of the first embodiment. Seventh Embodiment EFL = 4.61 mm, Fno = 1.59, HFOV = 65 deg surface Surface type Radius of curvature (mm) Distance(mm) refractive index Dispersion coefficient Focal length (mm) material subject flat unlimited unlimited first lens 701a spherical Infinity 1.400 1.518 64.2 -9.73 grass 701b spherical 5.040 3.584 second lens 702a spherical -12.364 2.554 1.518 64.1 -11.34 grass 702b spherical 11.965 1.280 third lens 703a Aspherical 8.400 4.955 1.865 37.1 7.62 grass 703b Aspherical -22.255 0.714 aperture ST unlimited 0.000 fourth lens 704a spherical -9.486 1.317 1.699 30.7 -12.89 grass 704b (glued side) spherical 186.424 0.000 Fifth lens 705a (glued side) spherical 186.424 1.799 1.702 51.1 12.91 grass 705b spherical -9.487 0.454 sixth lens 706a spherical 229.888 4.737 1.702 51.1 8.51 grass 706b (glued side) spherical -6.079 0.000 seventh lens 707a (glued side) spherical -6.079 0.593 1.969 17.5 -15.13 grass 707b spherical -10.886 2.674 Eighth lens 708a Aspherical 10.317 4.001 1.487 84.5 27.67 grass 708b Aspherical 38.262 1.500 filter element 709a flat unlimited 0.210 1.517 64.2 grass 709b flat unlimited 1.897 protective glass 710a flat unlimited 0.500 1.517 64.2 grass 710b flat unlimited 0.405 Imaging plane 711 flat unlimited Reference wavelength: 555 nm Table 18 Aspheric coefficients of the seventh embodiment surface 703a 703b 708a 708b K 7.25E-01 2.28E+01 1.69E+00 5.72E+01 A ₂ 0.00E+00 0.00E+00 0.00E+00 0.00E+00 A ₄ 1.38E-05 1.05E-03 -1.09E-04 -2.49E-05 A ₆ 6.16E-06 2.86E-05 -1.16E-06 4.17E-06 A ₈ -1.94E-07 -4.61E-07 1.84E-07 2.90E-07 A ₁₀ 6.67E-09 1.25E-07 -4.05E-09 4.25E-09 A ₁₂ 2.82E-10 2.64E-10 2.17E-11 -1.78E-10 A ₁₄ -7.08E-12 -1.46E-10 -5.35E-15 5.08E-12 Table 19

In the seventh embodiment, the numerical values of the relational expressions of the optical imaging lens group 700 are listed in Table 20. It can be seen from Table 20 that the optical imaging lens group 700 of the seventh embodiment satisfies the requirements of the relational expressions (1) to (17). relational Numerical value f8/f3 3.63 f3/EFL 1.65 f45/EFL 21.00 TTL/EFL 7.50 R15/R14 -0.95 f1/f2 0.86 AT23/CT2 0.50 f67/EFL 4.44 AT78/EFL 0.58 Vd4 30.7 Vd5 51.1 Vd6 51.1 Vd7 17.5 Vd4+Vd7 48.2 Vd5+Vd6 102.2 Vd8 84.5 R16/R15 3.71 Nd3 1.865 Nd7 1.969 Table 20

Referring to FIG. 7B , from left to right in the figure are the longitudinal spherical aberration diagram, the astigmatic field curvature diagram and the distortion aberration diagram of the optical imaging lens group 700 respectively. It can be seen from the longitudinal spherical aberration diagram that the off-axis light of the three visible light wavelengths of 470nm, 555nm and 650nm at different heights can be concentrated near the imaging point, and the deviation of the imaging point can be controlled within + 0.03mm. It can be seen from the astigmatic field curvature aberration diagram (wavelength 555nm) that the focal length variation of the sagittal aberration in the entire field of view is within + 0.02mm; the focal length of the meridional aberration in the entire field of view The variation is within + 0.01mm; and the distortion aberration can be controlled within 18%. As shown in FIG. 7B , the optical imaging lens group 700 of this embodiment has corrected various aberrations well, and meets the imaging quality requirements of the optical system. Eighth Embodiment

Referring to FIG. 8A and FIG. 8B , FIG. 8A is a schematic diagram of an optical imaging lens group according to an eighth embodiment of the present invention. 8B is a longitudinal spherical aberration diagram (Longitudinal Spherical Aberration), an astigmatism/Field Curvature diagram (Astigmatism/Field Curvature), and a distortion aberration diagram (Distortion) in order from left to right according to the eighth embodiment of the present invention.

As shown in FIG. 8A , the optical imaging lens group 800 of the eighth embodiment includes a first lens 801, a second lens 802, a third lens 803, an aperture ST, a fourth lens 804, a A fifth lens 805 , a sixth lens 806 , a seventh lens 807 and an eighth lens 808 . The optical imaging lens group 800 may further include a filter element 809 , a protective glass 810 and an imaging surface 811 . An image sensing element 820 can be further disposed on the imaging surface 811 to form an imaging device (not marked).

The first lens 801 has a negative refractive power, the object side 801a is convex, the image side 801b is concave, and both the object side 801a and the image side 801b are spherical. The material of the first lens 801 is glass.

The second lens 802 has a negative refractive power, the object side 802a is concave, the image side 802b is concave, and both the object side 802a and the image side 802b are spherical. The material of the second lens 802 is plastic.

The third lens 803 has a positive refractive power, the object side 803a is convex, the image side 803b is convex, and both the object side 803a and the image side 803b are aspherical. The material of the third lens 803 is glass.

The fourth lens 804 has a negative refractive power, the object side 804a is concave, the image side 804b is concave, and both the object side 804a and the image side 804b are spherical. The material of the fourth lens 804 is glass.

The fifth lens 805 has a positive refractive power, the object side 805a is convex, the image side 805b is convex, and both the object side 805a and the image side 805b are spherical. The material of the fifth lens 805 is glass. The image side surface 804b of the fourth lens 804 and the object side surface 805a of the fifth lens 805 have the same curvature radius, and are bonded to each other to form a cemented lens.

The sixth lens 806 has a positive refractive power, its object side 806a is convex, its image side 806b is convex, and its object side 806a and image side 806b are both spherical. The material of the sixth lens 806 is plastic.

The seventh lens 807 has a negative refractive power, the object side 807a is concave, the image side 807b is convex, and the object side 807a and the image side 807b are spherical. The material of the seventh lens 807 is glass. The image side surface 806b of the sixth lens 806 and the object side surface 807a of the seventh lens 807 have the same curvature radius, and are bonded to each other to form a cemented lens.

The eighth lens 808 has a positive refractive power, the object side 808a is convex, the image side 808b is concave, and both the object side 808a and the image side 808b are aspherical. The material of the eighth lens 808 is glass.

The filter element 809 is disposed between the eighth lens 808 and the imaging surface 811 for filtering out light in a specific wavelength range, such as an infrared filter element (IR Filter). Both surfaces 809a and 809b of the filter element 809 are flat surfaces, and the material is glass.

The protective glass 810 is disposed on the image sensing element 820 , the two surfaces 810 a and 810 b are both flat surfaces, and the material is glass.

The Image Sensor 820 is, for example, a Charge-Coupled Device (CCD) Image Sensor or a CMOS Image Sensor.

The detailed optical data of the optical imaging lens group 800 of the eighth embodiment and the aspheric coefficient of the lens surface are listed in Table 21 and Table 22, respectively. In the eighth embodiment, the curve equation of the aspheric surface is expressed as in the form of the first embodiment. Eighth Embodiment EFL = 4.42 mm, Fno = 1.6, HFOV = 71.3 deg surface Surface type Radius of curvature (mm) Distance(mm) refractive index Dispersion coefficient Focal length (mm) material subject flat unlimited unlimited first lens 801a spherical 135.000 1.451 1.518 64.1 -10.16 grass 801b spherical 5.043 4.300 second lens 802a spherical -9.580 2.554 1.533 55.8 -10.21 plastic 802b spherical 13.770 1.248 third lens 803a Aspherical 8.437 4.946 1.865 37.1 7.60 grass 803b Aspherical -21.750 0.717 aperture ST unlimited 0.000 fourth lens 804a spherical -7.682 1.314 1.703 30.1 -10.89 grass 804b (glue side) spherical 2250.171 0.000 Fifth lens 805a (glued side) spherical 2250.171 1.797 1.696 53.3 12.00 grass 805b spherical -8.382 0.448 sixth lens 806a spherical 16.671 4.723 1.536 56.1 9.34 plastic 806b (glued side) spherical -6.449 0.000 seventh lens 807a (glued side) spherical -6.449 0.600 1.969 17.5 -17.35 grass 807b spherical -10.940 2.499 Eighth lens 808a Aspherical 10.791 4.001 1.497 81.5 29.02 grass 808b Aspherical 37.332 1.500 filter element 809a flat unlimited 0.210 1.518 64.2 grass 809b flat unlimited 1.520 protective glass 810a flat unlimited 0.500 1.517 64.2 grass 810b flat unlimited 0.405 Imaging plane 811 flat unlimited Reference wavelength: 555 nm Table 21 Aspheric coefficient of the eighth embodiment surface 803a 803b 808a 808b K 7.11E-01 2.41E+01 1.91E+00 5.96E+01 A ₂ 0.00E+00 0.00E+00 0.00E+00 0.00E+00 A ₄ 8.50E-06 9.92E-04 -9.29E-05 -3.53E-05 A ₆ 4.32E-06 2.84E-05 9.27E-07 1.32E-05 A ₈ -5.36E-08 -5.38E-07 2.71E-07 2.51E-07 A ₁₀ 5.36E-09 1.22E-07 -3.59E-09 6.86E-09 A ₁₂ 5.99E-11 7.50E-10 -2.30E-11 -4.93E-11 A ₁₄ -1.96E-12 -2.51E-11 7.74E-14 1.40E-11 Table 22

In the eighth embodiment, the numerical values of the relational expressions of the optical imaging lens group 800 are listed in Table 23. It can be seen from Table 23 that the optical imaging lens group 800 of the eighth embodiment satisfies the requirements of the relational expressions (1) to (17). relational Numerical value f8/f3 3.82 f3/EFL 1.72 f45/EFL 41.85 TTL/EFL 7.86 R15/R14 -0.99 f1/f2 0.99 AT23/CT2 0.49 f67/EFL 4.32 AT78/EFL 0.57 Vd4 30.1 Vd5 53.3 Vd6 56.1 Vd7 17.5 Vd4+Vd7 47.6 Vd5+Vd6 109.4 Vd8 81.5 R16/R15 3.46 Nd3 1.865 Nd7 1.969 From Table XXIII

Referring to FIG. 8B , from left to right in the figure are the longitudinal spherical aberration diagram, the astigmatic field curvature diagram and the distortion aberration diagram of the optical imaging lens group 800 respectively. It can be seen from the longitudinal spherical aberration diagram that the off-axis light of the three visible light wavelengths of 470nm, 555nm 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. It can be seen from the astigmatic field curvature aberration diagram (wavelength 555nm) that the focal length variation of the sagittal aberration in the entire field of view is within + 0.02mm; the aberration in the meridional direction is within the focal length of the entire field of view. The variation is within + 0.02mm; and the distortion aberration can be controlled within 22%. As shown in FIG. 8B , the optical imaging lens group 800 of this embodiment has corrected various aberrations well, and meets the imaging quality requirements of the optical system. Ninth Embodiment

A ninth embodiment of the present invention is an imaging device. The imaging device includes the optical imaging lens group of the first to eighth embodiments described above, and an image sensing element. The image sensing element is, for example, disposed in the optical imaging device. Like the imaging plane of the lens group. The image sensing element is, for example, a Charge-Coupled Device (CCD) or a Complementary Metal Oxide Semiconductor (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. Tenth Embodiment

Please refer to FIG. 9 , which is a schematic diagram of an electronic device 1000 according to a tenth embodiment of the present invention. As shown, the electronic device 1000 includes an imaging device 1010 . The imaging device 1010 is, for example, the imaging device of the aforementioned ninth embodiment, which may be composed of the optical imaging lens group of the present invention and an image sensing element. The electronic device 1000 is, for example, a vehicle camera, a surveillance camera, or an aerial camera.

Although the present invention is described using the foregoing embodiments, these embodiments are not intended to limit the scope of the present invention. For those skilled in the art to which the present invention pertains, various changes in form and details can still be made with reference to the content of the embodiments disclosed in the present invention without departing from the spirit and scope of the present invention. Therefore, it should be understood here that the present invention is subject to the definition of the following patent application scope, and any changes made within the application patent scope or its equivalent scope shall still fall into the application of the present invention. within the scope of the patent.

100, 200, 300, 400, 500, 600, 700, 800: Optical imaging lens group 101, 201, 301, 401, 501, 601, 701, 801: the first lens 102, 202, 302, 402, 502, 602, 702, 802: Second lens 103, 203, 303, 403, 503, 603, 703, 803: The third lens 104, 204, 304, 404, 504, 604, 704, 804: Fourth lens 105, 205, 305, 405, 505, 605, 705, 805: Fifth lens 106, 206, 306, 406, 506, 606, 706, 806: Sixth lens 107, 207, 307, 407, 507, 607, 707, 807: seventh lens 108, 208, 308, 408, 508, 608, 708, 808: Eighth lens 109, 209, 309, 409, 509, 609, 709, 809: filter elements 110, 210, 310, 410, 510, 610, 710, 810: Protective glass 111, 211, 311, 411, 511, 611, 711, 811: Imaging plane 101a, 201a, 301a, 401a, 501a, 601a, 701a, 801a: the side of the first lens 101b, 201b, 301b, 401b, 501b, 601b, 701b, 801b: the image side of the first lens 102a, 202a, 302a, 402a, 502a, 602a, 702a, 802a: the side of the second lens 102b, 202b, 302b, 402b, 502b, 602b, 702b, 802b: the image side of the second lens 103a, 203a, 303a, 403a, 503a, 603a, 703a, 803a: the side of the third lens 103b, 203b, 303b, 403b, 503b, 603b, 703b, 803b: the image side of the third lens 104a, 204a, 304a, 404a, 504a, 604a, 704a, 804a: the side of the fourth lens 104b, 204b, 304b, 404b, 504b, 604b, 704b, 804b: the image side of the fourth lens 105a, 205a, 305a, 405a, 505a, 605a, 705a, 805a: the side of the fifth lens 105b, 205b, 305b, 405b, 505b, 605b, 705b, 805b: the image side of the fifth lens 106a, 206a, 306a, 406a, 506a, 606a, 706a, 806a: the side of the sixth lens 106b, 206b, 306b, 406b, 506b, 606b, 706b, 806b: the image side of the sixth lens 107a, 207a, 307a, 407a, 507a, 607a, 707a, 807a: the side of the seventh lens 107b, 207b, 307b, 407b, 507b, 607b, 707b, 807b: the image side of the seventh lens 108a, 208a, 308a, 408a, 508a, 608a, 708a, 808a: the side of the object of the eighth lens 108b, 208b, 308b, 408b, 508b, 608b, 708b, 808b: the image side of the eighth lens 109a, 109b, 209a, 209b, 309a, 309b, 409a, 409b, 509a, 509b, 609a, 609b, 709a, 709b, 809a, 809b: the second surface of the filter element 110a, 110b, 210a, 210b, 310a, 310b, 410a, 410b, 510a, 510b, 610a, 610b, 710a, 710b, 810a, 810b: the second surface of the protective glass 120, 220, 320, 420, 520, 620, 720, 820: image sensing elements 1000: Electronics 1010: Imaging Devices I: Optical axis ST: Aperture

[FIG. 1A] is a schematic diagram of the optical imaging lens group according to the first embodiment of the present invention; [FIG. 1B] are the longitudinal spherical aberration diagram, the astigmatic field curvature diagram, and the distortion aberration diagram of the first embodiment of the present invention in order from left to right; [FIG. 2A] is a schematic diagram of an optical imaging lens group according to the second embodiment of the present invention; [FIG. 2B] is a longitudinal spherical aberration diagram, an astigmatic field curvature aberration diagram, and a distortion aberration diagram of the second embodiment of the present invention in order from left to right; [FIG. 3A] is a schematic diagram of an optical imaging lens group according to the third embodiment of the present invention; [FIG. 3B] is the longitudinal spherical aberration diagram, the astigmatic field curvature aberration diagram and the distortion aberration diagram of the third embodiment of the present invention in order from left to right; [FIG. 4A] is a schematic diagram of an optical imaging lens group according to the fourth embodiment of the present invention; [FIG. 4B] is the longitudinal spherical aberration diagram, the astigmatic field curvature aberration diagram and the distortion aberration diagram of the fourth embodiment of the present invention in order from left to right; [FIG. 5A] is a schematic diagram of an optical imaging lens group according to a fifth embodiment of the present invention; [FIG. 5B] is the longitudinal spherical aberration diagram, the astigmatic field curvature diagram and the distortion aberration diagram of the fifth embodiment of the present invention in order from left to right; [FIG. 6A] is a schematic diagram of an optical imaging lens group according to the sixth embodiment of the present invention; [FIG. 6B] are the longitudinal spherical aberration diagram, the astigmatic field curvature diagram and the distortion aberration diagram of the sixth embodiment of the present invention in order from left to right; [ FIG. 7A ] is a schematic diagram of an optical imaging lens group according to the seventh embodiment of the present invention; [FIG. 7B] From left to right are longitudinal spherical aberration diagrams, astigmatic field curvature diagrams, and distortion aberration diagrams of the seventh embodiment of the present invention; [FIG. 8A] is a schematic diagram of an optical imaging lens group according to the eighth embodiment of the present invention; [FIG. 8B] is a longitudinal spherical aberration diagram, an astigmatic field curvature aberration diagram, and a distortion aberration diagram of the eighth embodiment of the present invention in order from left to right; and [FIG. 9] is a schematic diagram of an electronic device according to a tenth embodiment of the present invention.

100: Optical imaging lens group

101: The first lens

102: Second lens

103: The third lens

104: Fourth lens

105: Fifth lens

106: Sixth lens

107: Seventh Lens

108: Eighth Lens

109: Filter element

110: Protective glass

111: Imaging surface

101a: The side of the object of the first lens

101b: Side of the image of the first lens

102a: The side of the object of the second lens

102b: Image side of the second lens

103a: The side of the object of the third lens

103b: Side view of the image of the third lens

104a: The side of the object of the fourth lens

104b: The image side of the fourth lens

105a: The side of the object of the fifth lens

105b: Side view of the image of the fifth lens

106a: The side of the sixth lens

106b: Side view of the image of the sixth lens

107a: The side of the seventh lens

107b: Side view of the image of the seventh lens

108a: The side of the object of the eighth lens

108b: Side view of the image of the eighth lens

109a, 109b: the second surface of the filter element

110a, 110b: the second surface of the protective glass

120: Image Sensing Components

I: Optical axis

ST: Aperture

Claims (18)

An optical image-taking lens group, comprising in sequence from the object side to the image side: a first lens, with negative refractive power, whose image side is concave; a second lens, with negative refractive power, the object side is concave and the image side is concave; a third lens with positive refractive power, the object side is convex and the image side is convex; an aperture; a fourth lens, with negative refractive power, whose object side is concave; a fifth lens with positive refractive power and a convex image side surface, wherein the fourth lens and the fifth lens form a cemented lens; a sixth lens, with positive refractive power, and its image side surface is convex; a seventh lens having negative refractive power, the object side is concave and the image side is convex, wherein the sixth lens and the seventh lens constitute a cemented lens; and An eighth lens with positive refractive power and a convex object side surface; wherein, the total number of lenses in the optical imaging lens group is eight; wherein, the focal length of the third lens is f3, and the focal length of the eighth lens is f8 , which satisfies the following relation: 2<f8/f3<6. For the optical image pickup lens set in the first item of the patent application scope, wherein, the focal length of the third lens is f3, and the effective focal length of the optical image pickup lens set is EFL, which satisfies the following relationship: 1<f3/EFL<5. For the optical image-taking lens set in the first item of the patent application scope, the combined focal length of the fourth lens and the fifth lens is f45, and the effective focal length of the optical image-taking lens set is EFL, which satisfies the following relationship: 5<f45/EFL<42. An optical image-taking lens group, comprising in sequence from the object side to the image side: a first lens, with negative refractive power, whose image side is concave; a second lens, with negative refractive power, the object side is concave and the image side is concave; a third lens with positive refractive power, the object side is convex and the image side is convex; an aperture; a fourth lens, with negative refractive power, whose object side is concave; a fifth lens with positive refractive power and a convex image side surface, wherein the fourth lens and the fifth lens form a cemented lens; a sixth lens, with positive refractive power, and its image side surface is convex; a seventh lens having negative refractive power, the object side is concave and the image side is convex, wherein the sixth lens and the seventh lens constitute a cemented lens; and An eighth lens with positive refractive power and a convex object side surface; wherein, the total number of lenses in the optical imaging lens group is eight; wherein, the focal length of the third lens is f3, the fourth lens and the fifth lens The combined focal length of the lens is f45, and the effective focal length of the optical imaging lens group is EFL, which satisfies the following relationship: 1<f3/EFL<5; and 5<f45/EFL<42. For the optical imaging lens set of item 4 of the scope of the patent application, the focal length of the third lens is f3, and the focal length of the eighth lens is f8, which satisfy the following relationship: 2<f8/f3<6. According to the optical image pickup lens group of item 1 or 4 of the scope of application, wherein the distance on the optical axis from the object side of the first lens of the optical image pickup lens group to the image plane of the optical image pickup lens group is: TTL, the effective focal length of the optical imaging lens group is EFL, which satisfies the following relationship: 7<TTL/EFL<9.5. For the optical imaging lens set according to item 1 or item 4 of the scope of the patent application, the curvature radius of the image side surface of the seventh lens is R14, and the curvature radius of the object side surface of the eighth lens is R15, which satisfy the following relationship Mode: -3<R15/R14<-0.7. For the optical imaging lens set according to item 1 or item 4 of the scope of the patent application, wherein the focal length of the first lens is f1, and the focal length of the second lens is f2, the following relational expressions are satisfied: 0.2<f1/f2<1.2. For the optical imaging lens set of item 1 or item 4 of the claimed scope, the distance on the optical axis from the image side of the second lens to the object side of the third lens is AT23, and the second lens is on the optical axis The thickness above is CT2, which satisfies the following relationship: 0.3<AT23/CT2<0.9. For the optical image pickup lens set according to item 1 or 4 of the scope of application, wherein the combined focal length of the sixth lens and the seventh lens is f67, and the effective focal length of the optical image pickup lens set is EFL, which satisfies the following Relationship: 3<f67/EFL<8. If the optical imaging lens set of item 1 or item 4 of the scope of the patent application, wherein, the distance on the optical axis from the image side surface of the seventh lens to the object side surface of the eighth lens is AT78, and the effective imaging lens set is The focal length is EFL, which satisfies the following relationship: 0.2<AT78/EFL<0.8. For the optical imaging lens set according to item 1 or item 4 of the claimed scope, the dispersion coefficient of the fourth lens is Vd4, the dispersion coefficient of the fifth lens is Vd5, and the dispersion coefficient of the sixth lens is Vd6, The dispersion coefficient of the seventh lens is Vd7, which satisfies the following relationship: Vd4＜Vd5; Vd6>Vd7; 40<Vd4+Vd7<55; and 90<Vd5+Vd6<130. For the optical imaging lens set of item 1 or item 4 of the scope of the application, wherein, the dispersion coefficient of the eighth lens is Vd8, which satisfies the following relational expression: 45<Vd8<90. For the optical imaging lens set according to item 1 or item 4 of the scope of the patent application, wherein the radius of curvature of the object side surface of the eighth lens is R15, and the radius of curvature of the image side surface is R16, the following relational expressions are satisfied: 2<R16/R15<5. For the optical imaging lens set of item 1 or item 4 of the scope of the application, wherein the refractive index of the third lens is Nd3, the refractive index of the seventh lens is Nd7, and the following relational expressions are satisfied: Nd3>1.75; and Nd7>1.75. An optical image-taking lens group, comprising in sequence from the object side to the image side: a first lens, with negative refractive power, whose image side is concave; a second lens, with negative refractive power, the object side is concave and the image side is concave; a third lens with positive refractive power, the object side is convex and the image side is convex; an aperture; a fourth lens, with negative refractive power, whose object side is concave; a fifth lens with positive refractive power and a convex image side surface, wherein the fourth lens and the fifth lens form a cemented lens; a sixth lens, with positive refractive power, and its image side surface is convex; a seventh lens with negative refractive power, the object side is concave and the image side is convex, wherein the sixth lens and the seventh lens constitute a cemented lens; and An eighth lens with positive refractive power, the object side surface is convex, and the image side surface is concave; wherein, the object side of the first lens of the optical imaging lens group to the imaging surface of the optical imaging lens group is on the optical axis The distance is TTL, and the effective focal length of the optical imaging lens group is EFL, which satisfies the following relationship: 7<TTL/EFL<9.5. An imaging device comprising the optical imaging lens set as claimed in item 1, item 4 or item 16 of the scope of application, and an image sensing element, wherein the image sensing element is disposed on the optical imaging lens The imaging plane of the group. An electronic device comprising the imaging device as claimed in item 17 of the patent application scope.

Images