TWI726835B - Optical imaging lens, imaging device, and electronic device - Google Patents

Abstract

An optical imaging lens including, from an object side to an image side, a first lens with negative refractive power and including an image-side surface being concave, a second lens with negative refractive power and including an object-side surface being concave and an image-side surface being convex, a third lens with positive refractive power and including an image-side surface being convex, an aperture stop, a fourth lens with positive refractive power and including an object-side surface being convex, a fifth lens with positive refractive power and including an object-side surface being convex and an image-side surface being convex, a sixth lens with negative refractive power and including an object-side surface being concave, a seventh lens with negative refractive power and including an object-side surface being concave and an image-side surface being convex, and an eighth lens with positive refractive power and including an object-side surface being convex and an image-side surface being concave.

Description

Optical camera lens group, imaging device and electronic device

The present invention relates to an optical camera lens group and imaging device, and particularly relates to an optical camera lens group, imaging device and electronic device suitable for a photographic electronic device or a surveillance camera system for vehicles.

With the continuous advancement of semiconductor manufacturing technology, the pixels of image sensor components can reach a smaller size and the performance has been significantly improved. Therefore, optical lenses with high imaging quality have become an indispensable part of electronic camera devices.

With the diversified development of electronic camera devices, its application range has become 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 The requirements are also more diverse. In terms of vehicle photography devices, 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 properly correct various aberrations, especially for distance measurement or object recognition purposes, if there is a large distortion aberration in the captured image, errors are likely to occur when calculating the distance or image recognition.

Therefore, how to design an optical imaging device to achieve a balance between miniaturization, high resolution, and good optical imaging quality has become the goal of this technical field.

Therefore, in order to solve the above-mentioned problems, the present invention provides an optical imaging lens group, which sequentially includes a first lens, a second lens, a third lens, an aperture, a fourth lens, a fifth lens, and a sixth lens from the object side to the image side. Lens, seventh lens and eighth lens. Among them, the first lens has negative refractive power, and its image side surface is concave; the second lens has negative refractive power, its object side surface is concave, and the image side surface is convex; the third lens has positive refractive power, its image side surface is convex; The fourth lens has positive refractive power and its object side surface is convex; the fifth lens has positive refractive power, its object side surface is convex, and its image side surface is convex; the sixth lens has negative refractive power, and its object side surface is concave. The fifth lens and the sixth lens constitute a cemented lens; the seventh lens has negative refractive power, and its object side surface is concave and the image side surface is convex; the eighth lens has positive refractive power, its object side surface is convex and the image side surface is concave. The total number of lenses in the optical imaging lens group is eight; among them, the combined focal length of the third lens and the fourth lens is f34, and the effective focal length of the optical imaging lens group is EFL, which satisfies the following relationship: 1<f34/ EFL<3.

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 satisfies the following relationship: 0.1<f1/f2<0.7.

According to an embodiment of the present invention, the focal length of the eighth lens is f8, and the effective focal length EFL of the optical imaging lens group satisfies the following relationship: 1.6<f8/EFL<5.

The present invention also 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. Among them, the first lens has negative refractive power, and its image side surface is concave; the second lens has negative refractive power, its object side surface is concave, and the image side surface is convex; the third lens has positive refractive power, its image side surface is convex; The fourth lens has positive refractive power and its object side surface is convex; the fifth lens has positive refractive power, its object side surface is convex, and its image side surface is convex; the sixth lens has negative refractive power, and its object side surface is concave. The fifth lens and the sixth lens constitute a cemented lens; the seventh lens has negative refractive power, and its object side surface is concave and the image side surface is convex; the eighth lens has positive refractive power, its object side surface is convex and the image side surface is concave. The total number of lenses in the optical imaging lens group is eight; the focal length of the first lens is f1, the focal length of the second lens is f2, the focal length of the eighth lens is f8, and the effective focal length of the optical imaging lens group is EFL. The following relational expressions are satisfied: 0.1<f1/f2<0.7; and 1.6<f8/EFL<5.

According to an embodiment of the present invention, the focal length of the first lens f1, the focal length of the second lens f2, the focal length of the third lens f3, the focal length of the fourth lens f4, the focal length of the fifth lens f5, the focal length of the sixth lens f6, The focal length f7 of the seventh lens and the focal length f8 of the eighth lens are the same as the refractive index of the first lens Nd1, the refractive index of the second lens Nd2, the refractive index of the third lens Nd3, the refractive index of the fourth lens Nd4, and the fifth lens The index of refraction Nd5, the index of refraction of the sixth lens Nd6, the index of refraction of the seventh lens Nd7 and the index of refraction Nd8 of the eighth lens satisfy the following relationship:|1/(f1*Nd1)+1/(f2*Nd2 )+1/(f3*Nd3)+1/(f4*Nd4) +1/(f5*Nd5)+ 1/(f6*Nd6)+1/(f7*Nd7)+1/(f8*Nd8)| <0.02.

According to an embodiment of the present invention, the combined focal length of the fifth lens and the sixth lens is f56, and the effective focal length EFL of the optical imaging lens group satisfies the following relationship: 2<f56/EFL/6.

According to an embodiment of the present invention, the combined focal length of the seventh lens and the eighth lens is f78, and the effective focal length EFL of the optical imaging lens group satisfies the following relationship: 2.5＜|f78|/EFL ＜180 .

According to an embodiment of the present invention, the focal length of the sixth lens is f6, and the focal length of the seventh lens is f7, which satisfies the following relationship: 0.3<f6/f7<1.2.

According to an embodiment of the present invention, the curvature radius of the object side surface of the second lens is R3, and the curvature radius of the image side surface is R4, which satisfies the following relationship: 1<R4/R3<2.

According to an embodiment of the present invention, the radius of curvature of the object side surface of the seventh lens is R13, and the radius of curvature of the image side surface is R14, which satisfies the following relationship: 2<R14/R13<25.

According to an embodiment of the present invention, the curvature of the object side of the fourth lens is C7 and the curvature of the image side is C8, which satisfies the following relationship: 0.5<(C7+C8)/(C7-C8)<1.5.

According to an embodiment of the present invention, the distance from the image side of the first lens to the object side of the second lens on the optical axis is AT12, the thickness of the first lens on the optical axis is CT1, and the distance between the second lens on the optical axis The thickness is CT2, which satisfies the following relationship: 0.6<AT12/(CT1+CT2)<2.3.

According to an embodiment of the present invention, the distance from the image side of the eighth lens to the imaging surface of the optical imaging lens group on the optical axis is BFL, and the effective focal length EFL of the optical imaging lens group satisfies the following relationship : 0.2<BFL/EFL<0.8.

According to an embodiment of the present invention, the distance from the object side of the first lens to the image side of the third lens on the optical axis is Dr1r6, the thickness of the first lens on the optical axis is CT1, and the thickness of the second lens on the optical axis It is CT2, and the thickness of the third lens on the optical axis is CT3, which satisfies the following relationship: 1.2<Dr1r6/(CT1+CT2+CT3)<2.5.

According to an embodiment of the present invention, the dispersion coefficient of the first lens is Vd1, and the dispersion coefficient of the second lens is Vd2, which satisfies the following relationship: 16<Vd1-Vd2<45.

According to an embodiment of the present invention, the dispersion coefficient of the third lens is Vd3, the dispersion coefficient of the fourth lens is Vd4, and the dispersion coefficient of the fifth lens is Vd5, which satisfies the following relationship: 120<Vd3+ Vd4+Vd5<180 .

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

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

In the following embodiments, the lenses of the optical imaging lens group can be made of glass or plastic materials, and are 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 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 imaging The service life of the lens group. When the lens material is plastic, it is beneficial to reduce the weight of the optical camera lens group and reduce the production cost.

In the embodiment of the present invention, each lens includes an object side facing the object and an image side facing the imaging surface. The surface shape of each lens is defined based on the shape of the area near the optical axis (paraxial) of the surface. For example, when the object side of a lens is described as convex, it means that the object side of the lens near the optical axis is convex. That is, although the lens surface is described as convex in the embodiment, the surface may be convex or concave in the region away from the optical axis (off-axis). The shape of the paraxial position of each lens is judged by the positive or negative curvature radius of the surface. For example, if the curvature radius of the object side of a lens is positive, the object side surface is convex; otherwise, if it is If the radius of curvature is negative, the side surface of the object is concave. As for the image side surface of a lens, if its radius of curvature is positive, the image side surface is concave; conversely, if its radius of curvature is negative, the image side surface is convex.

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

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

The present invention provides an optical imaging lens group, which sequentially includes a first lens, a second lens, a third lens, an aperture, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens from the object side to the image side. lens. Among them, the first lens has negative refractive power, and its image side surface is concave; the second lens has negative refractive power, its object side surface is concave, and the image side surface is convex; the third lens has positive refractive power, and its image side surface is Convex surface; aperture; the fourth lens, with positive refractive power, its object side is convex; the fifth lens, with positive refractive power, its object side is convex, the image side is convex; the sixth lens has negative refractive power, its object The side surface is concave, wherein the fifth lens and the sixth lens constitute a cemented lens; the seventh lens has negative refractive power, the object side is concave, and the image side is convex; and the eighth lens has positive refractive power, The object side surface is convex and the image side surface is concave; the number of lens groups in this optical imaging lens group is eight.

The first lens has a negative refractive power, and its image side surface is concave, which helps to expand the viewing angle and increase the light collection range of the optical imaging lens group. The second lens also has a negative refractive power, and its object side is concave and the image side is convex, which helps correct the aberrations generated by the first lens.

The third lens has a positive refractive power to converge light. The third lens is adjacent to the first lens and the second lens with negative refractive power, which helps to control the size of the lens and can prevent the back focal length of the imaging lens group from being too long.

The fourth lens has a positive refractive power and is used as the main component to adjust the optical path. The object side of the fourth lens is convex, which is arranged behind the aperture. The refractive power and surface shape of the fourth lens match with the third lens, which is beneficial to reduce Imaging aberrations.

The fifth lens has positive refractive power, and its object side surface is convex and the image side surface is convex. The sixth lens has negative refractive power and its object side surface is concave. The fifth lens and the sixth lens are bonded to each other to form a cemented lens, which is beneficial to correct the spherical aberration and chromatic aberration of the imaging lens group.

The seventh lens has negative refractive power, the object side is concave, and the image side is convex. The eighth lens has positive refractive power, the object side is convex, and the image side is concave. The combination of the refractive power and lens surface shape of the seventh lens and the eighth lens helps correct the curvature of field aberrations and distortion aberrations of the imaging lens group.

The combined focal length of the third lens and the fourth lens of the optical imaging lens group is f34, and the effective focal length of the overall optical imaging lens group is EFL, which satisfies the following relationship:

1＜f34/EFL＜3; (1)

By satisfying the condition of relation (1), the ratio between the combined focal length of the third lens and the fourth lens and the effective focal length EFL can be controlled. If f34/EFL is lower than the lower limit of the relationship (1), the positive refractive power of the third lens and the fourth lens is too large, which will easily shorten the back focal length of the camera lens group, which is not conducive to assembly; if f34/EFL is high The upper limit of the relation (1) will easily cause the effective focal length to be shortened and the image height to be reduced.

Further, 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, which satisfies the following relationship:

0.1<f1/f2<0.7; (2)

By satisfying the condition of the relational expression (2), the negative refractive power of the optical imaging lens group can be appropriately distributed to the first lens and the second lens, so that the combination of the two lenses can help reduce imaging aberrations.

Further, the focal length of the eighth lens of the optical imaging lens group is f8, and the effective focal length EFL of the optical imaging lens group satisfies the following relationship:

1.6<f8/EFL<5; (3)

By satisfying the condition of the relational formula (3), the eighth lens can have an appropriate positive refractive power, which is beneficial to correct aberrations, and does not affect the length of the back focus and the size of the image height.

The focal length f1 of the first lens of the optical imaging lens group, the focal length of the second lens f2, the focal length of the third lens f3, the focal length of the fourth lens f4, the focal length of the fifth lens f5, the focal length of the sixth lens f6, the first The focal length f7 of the seventh lens and the focal length f8 of the eighth lens are the same as the refractive index of the first lens Nd1, the refractive index of the second lens Nd2, the refractive index of the third lens Nd3, the refractive index of the fourth lens Nd4, and the fifth lens. The refractive index Nd5, the refractive index Nd6 of the sixth lens, the refractive index Nd7 of the seventh lens, and the refractive index Nd8 of the eighth lens satisfy the following relationship:

；（4）

; (4)

By satisfying the condition of the relational formula (4), it is advantageous to select the material and focal length of each lens, and reduce the field curvature aberration of the optical imaging lens group.

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

2<f56/EFL/6; (5)

By satisfying the condition of relation (5), it is helpful to control the cemented lens composed of the fifth lens and the sixth lens to have an appropriate positive refractive power, which can effectively correct aberrations and control the lens size.

The combined focal length of the seventh lens and the eighth lens of the optical imaging lens group is f78, and the effective focal length EFL of the overall optical imaging lens group satisfies the following relationship:

2.5＜|f78|/EFL＜180; (6)

By satisfying the condition of the relational formula (6), the combination of the seventh lens and the eighth lens can be controlled to have a lower refractive power, so that the rear two lenses of the optical imaging lens group are mainly used to correct aberrations.

The focal length of the sixth lens of the optical imaging lens group is f6, and the focal length of the seventh lens is f7, which satisfies the following relationship:

0.3<f6/f7<1.2; (7)

By satisfying the condition of relation (7), it is advantageous to appropriately distribute the negative refractive power to the sixth lens and the seventh lens.

The curvature radius of the object side surface of the second lens of the optical imaging lens group is R3, and the curvature radius of the image side surface is R4, which satisfies the following relationship:

1＜R4/R3＜2; (8)

By satisfying the condition of relation (8), it is helpful to control the shape of the object side and the image side of the second lens. Cooperating with the surface shape of the first lens, the first lens and the second lens can have similar optical effectiveness. radius.

The curvature radius of the object side surface of the seventh lens of the optical imaging lens group is R13, and the curvature radius of the image side surface is R14, which satisfies the following relationship:

2＜R14/R13＜25; (9)

By satisfying the condition of relation (9), the seventh lens can be a negative lens with a meniscus lens shape, and its surface shape is matched with the eighth lens, which is beneficial for correcting imaging aberrations.

The curvature of the object side surface of the fourth lens of the optical imaging lens group is C7, and the curvature of the image side surface is C8, which satisfies the following relationship:

0.5＜(C7+C8)/(C7-C8)＜1.5; (10)

By satisfying the condition of the relational expression (10), it is beneficial to control the shape of the fourth lens arranged behind the aperture, and it is helpful to reduce the imaging aberration.

The distance from the image side surface of the first lens to the object side surface of the second lens on the optical axis of the optical imaging lens group is AT12, the thickness of the first lens on the optical axis is CT1, and the thickness of the second lens on the optical axis is CT2 , The system satisfies the following relationship:

0.6＜AT12/(CT1+CT2)＜2.3; (11)

By satisfying the condition of relation (11), the distance between the first lens and the second lens on the optical axis and the thickness of the first lens and the second lens can be controlled to maintain an appropriate ratio, and then the optical imaging lens group can be controlled. size.

The distance from the image side surface of the eighth lens of the optical imaging lens group to the imaging surface of the optical imaging lens group on the optical axis is BFL, and the effective focal length EFL of the optical imaging lens group satisfies the following relationship:

0.2＜BFL/EFL＜0.8; (12)

By satisfying the condition of relation (12), the optical imaging lens group can have a proper size of back focus, which is beneficial to the assembly of the lens group.

The distance from the object side of the first lens to the image side of the third lens on the optical axis of the optical imaging lens group is Dr1r6, and the thickness of the first lens on the optical axis is CT1, and the thickness of the second lens on the optical axis is CT2, the thickness of the third lens on the optical axis is CT3, which satisfies the following relationship:

1.2＜Dr1r6/(CT1+CT2+CT3)＜2.5; (13)

By satisfying the condition of relation (13), the distance between the first three lenses can be adjusted appropriately, which is beneficial to correct the traveling direction of the light and reduce the imaging aberration.

The dispersion coefficient of the first lens of the optical imaging lens group is Vd1, and the dispersion coefficient of the second lens is Vd2, which satisfies the following relationship:

16＜Vd1-Vd2＜45; (14)

By satisfying the condition of relation (14), the selected first lens can have a higher dispersion coefficient than the second lens, which is beneficial to reduce the chromatic aberration of the optical imaging lens group.

The dispersion coefficient of the third lens of the optical imaging lens group is Vd3, the dispersion coefficient of the fourth lens is Vd4, and the dispersion coefficient of the fifth lens is Vd5, which satisfy the following relationship:

120＜Vd3+Vd4+Vd5＜180; (15)

By satisfying the condition of relation (15), the materials of the third lens, the fourth lens and the fifth lens selected have the characteristics of low dispersion, which is beneficial to reduce the chromatic aberration of the optical imaging lens group. The first embodiment

Referring to FIGS. 1A and 1B, FIG. 1A is a schematic diagram of an optical imaging lens group according to a first embodiment of the present invention. FIG. 1B shows the longitudinal spherical aberration (Longitudinal Spherical Aberration), the astigmatism/Field Curvature (Astigmatism/Field Curvature) and the distortion aberration (Distortion) of the first embodiment of the present invention 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, and a fifth lens in sequence from the object side to the image side. Lens 105, sixth lens 106, seventh lens 107, and eighth lens 108. The optical imaging lens group 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 provided on the imaging surface 111 to form an imaging device (not marked separately).

The first lens 101 has a negative refractive power, the object side surface 101a is convex, the image side surface 101b is concave, and the object side surface 101a and the image side surface 101b are spherical surfaces. 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 convex, 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 surface 103a is concave, the image side surface 103b is convex, and both the object side surface 103a and the image side surface 103b are spherical surfaces. The material of the third lens 103 is glass.

The fourth lens 104 has a positive refractive power, its object side surface 104a is convex, its image side surface 104b is concave, and its object side surface 104a and image side surface 104b are spherical surfaces. The material of the fourth lens 104 is glass.

The fifth lens 105 has a positive refractive power, the object side surface 105a is convex, the image side surface 105b is convex, and the object side surface 105a and the image side surface 105b are spherical surfaces. The material of the fifth lens 105 is glass.

The sixth lens 106 has a negative refractive power, its object side surface 106a is concave, its image side surface 106b is convex, and its object side surface 106a and image side surface 106b are spherical surfaces. The material of the sixth lens 106 is glass. The image side surface 105b of the fifth lens 105 and the object side surface 106a of the sixth lens 106 have the same radius of curvature, and are bonded to each other to form a cemented lens.

The seventh lens 107 has a negative refractive power, the object side surface 107a is concave, the image side surface 107b is convex, and the object side surface 107a and the image side surface 107b are spherical surfaces. The material of the seventh lens 107 is glass.

The eighth lens 108 has positive refractive power, its object side surface 108a is convex, its image side surface 108b is concave, and its object side surface 108a and image side surface 108b are both 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 to filter out light in a specific wavelength range, for example, an infrared filter (IR Filter). Both surfaces 109a and 109b of the filter element 109 are flat surfaces, and the material is glass.

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

The image sensor (Image Sensor) 120 is, for example, a charge-coupled device (CCD) Image Sensor or a complementary metal oxide semiconductor sensor (CMOS Image Sensor).

The curve equation of each aspheric surface mentioned above is expressed as follows:

Among them, X: the distance between the point Y on the aspheric surface from the optical axis and the tangent surface 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 near the optical axis;

K: Cone coefficient; and

Ai: the 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 surface 101a of the first lens 101 is designated as the surface 101a, the image side surface 101b is designated as the surface 101b, and the other lens surfaces are deduced by analogy. 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 to the image side 101b of the first lens 101 is 1.024 mm, which means that the first lens 101 is on the optical axis. The thickness is 1.024 mm. The distance from the image side 101b of the first lens 101 to the object side 102a of the second lens 102 is 3.5 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, the half of the maximum angle of view of the overall optical imaging lens group 100 is HFOV (Half Field of View), and the first lens 101 The distance from the object side 101a to the imaging surface 110 on the optical axis I is the total length TTL, and half of the diagonal of the effective sensing area of the image sensor 120 on the imaging surface 110 is the maximum image height ImgH, and its value is as follows: EFL= 8.29 mm, Fno= 1.69, TTL= 34.49 mm, HFOV= 34.8 degrees. The tables in the following embodiments correspond to the optical imaging lens sets of the embodiments, and the definitions of the tables are the same as in this embodiment, so they will not be repeated in the following embodiments. The first embodiment EFL = 8.29 mm, Fno = 1.69, HFOV = 34.8 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 20.084 1.024 1.513 62.6 -17.69 glass 101b Spherical 6.144 3.500 Second lens 102a Spherical -9.189 2.153 2.010 20.7 -35.22 glass 102b Spherical -13.847 0.110 Third lens 103a Spherical -33.151 1.856 1.767 48.5 29.36 glass 103b Spherical -13.732 6.800 aperture ST unlimited 0.000 Fourth lens 104a Spherical 9.958 2.206 1.673 47.1 15.56 glass 104b Spherical 187.195 4.214 Fifth lens 105a Spherical 13.304 2.513 1.692 49.7 7.53 glass 105b (glued surface) Spherical -7.900 0.000 Sixth lens 106a (glued surface) Spherical -7.900 0.505 1.931 20.9 -10.51 glass 106b Spherical -42.290 4.116 Seventh lens 107a Spherical -6.908 0.556 1.668 35.8 -11.14 glass 107b Spherical -100.000 0.073 Eighth lens 108a Aspherical 8.867 2.244 1.789 44.2 18.94 glass 108b Aspherical 19.369 1.058 Filter element 109a flat unlimited 0.210 1.517 64.2 glass 109b flat unlimited 0.800 Protective glass 110a flat unlimited 0.500 1.517 64.2 glass 110b flat unlimited 0.056 Imaging surface 111 flat unlimited Reference wavelength: 555 nm Table I

Please refer to Table 2 below, which shows the aspheric coefficients of each surface of the eighth lens in the first embodiment of the present invention. Among them, K is the conical surface coefficient in the aspheric curve equation, and A ₂ to A ₁₄ represent the second to 14th order aspheric coefficients of each surface. For example, the cone coefficient K of the object side surface 108a of the eighth lens 108 is -4.94. Others can be deduced by analogy, and will not be repeated below. In addition, the tables in the following embodiments correspond to the optical imaging lens sets of the embodiments, and the definitions of the tables are the same as in this embodiment, so they will not be repeated in the following embodiments. Aspheric coefficients of the first embodiment surface 108a 108b K -4.94E+00 5.89E+00 A ₂ 0.00E+00 0.00E+00 A ₄ 3.29E-04 -1.26E-04 A ₆ -5.92E-06 -9.53E-06 A ₈ -1.00E-06 -1.49E-06 A ₁₀ 7.29E-08 9.39E-08 A ₁₂ -2.89E-09 -3.80E-09 A ₁₄ 3.25E-11 5.47E-11 Table II

In the first embodiment, the relationship between the combined focal length f34 of the third lens 103 and the fourth lens 104 and the effective focal length EFL of the overall optical imaging lens group is f34/EFL=1.42.

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=0.5.

In the first embodiment, the relationship between the focal length f8 of the eighth lens 108 and the effective focal length EFL of the overall optical imaging lens group 100 is f8/EFL=2.28.

=0.011。 In the first embodiment, the focal length f1 of the first lens 101, the focal length f2 of the second lens 102, the focal length f3 of the third lens 103, the focal length f4 of the fourth lens 104, the focal length f5 of the fifth lens 105, and the sixth lens 106 The focal length f6 of the seventh lens 107 and the focal length f8 of the eighth lens 108 are the same as the refractive index Nd1 of the first lens 101, the refractive index Nd2 of the second lens 102, the refractive index Nd3 of the third lens 103, and the fourth lens. The relationship between the refractive index Nd4 of the lens 104, the refractive index Nd5 of the fifth lens 105, the refractive index Nd6 of the sixth lens 106, the refractive index Nd7 of the seventh lens 107 and the refractive index Nd8 of the eighth lens 108 is

=0.011.

In the first embodiment, the relationship between the combined focal length f56 of the fifth lens 105 and the sixth lens 106 and the effective focal length EFL of the overall optical imaging lens group 100 is f56/EFL=2.73.

In the first embodiment, the relationship between the absolute value of the combined focal length f78 of the seventh lens 107 and the eighth lens 108 and the effective focal length EFL of the overall optical imaging lens group 100 is |f78|/EFL=3.05.

In the first embodiment, the relationship between the focal length f6 of the sixth lens 106 and the focal length f7 of the seventh lens 107 is f6/f7=0.94.

In the first embodiment, the relationship between the radius of curvature R3 of the object side surface 102a of the second lens 102 and the radius of curvature R4 of the image side surface 102b is R4/R3=1.51.

In the first embodiment, the relationship between the radius of curvature R13 of the object side surface 107a of the seventh lens 107 and the radius of curvature R14 of the image side surface 107b is R14/R13=14.48.

In the first embodiment, the relationship between the curvature C7 of the object side surface 104a of the fourth lens 104 and the curvature C8 of the image side surface 104b is (C7+C8)/(C7-C8)=1.11.

In the first embodiment, the distance AT12 from the image side surface 101b of the first lens 101 to the object side surface 102a of the second lens 102 on the optical axis, and the thickness CT1 of the first lens 101 on the optical axis, and the second lens 102 on the optical axis The relational formula of the sum of the thickness CT2 is AT12/(CT1+CT2)=1.10.

In the first embodiment, the distance BFL from the image side surface 108b of the eighth lens 108 to the imaging surface 111 of the optical imaging lens group 100 on the optical axis is related to the effective focal length EFL of the optical imaging lens group 100 as BFL/EFL = 0.32.

In the first embodiment, the distance between the object side 101a of the first lens 101 and the image side 103b of the third lens 103 on the optical axis is Dr1r6, and the thickness of the first lens 101 on the optical axis CT1, and the second lens 102 on the optical axis The sum of the thickness CT2 of the third lens 103 and the thickness CT3 of the third lens 103 on the optical axis, the relational expression is Dr1r6/(CT1+CT2+CT3)=1.72.

In the first embodiment, the relationship between the dispersion coefficient Vd1 of the first lens 101 and the dispersion coefficient Vd2 of the second lens 102 is Vd1-Vd2=41.9.

In the first embodiment, the dispersion coefficient Vd3 of the third lens 103, the dispersion coefficient Vd4 of the fourth lens 104, and the dispersion coefficient Vd5 of the fifth lens 105 have a relationship of Vd3+Vd4+Vd5=145.3.

It can be seen from the numerical values of the above relational expressions that the optical imaging lens group 100 of the first embodiment satisfies the requirements of relational expressions (1) to (15).

Referring to FIG. 1B, from left to right are the longitudinal spherical aberration diagram, the astigmatic field curvature aberration diagram, and the distortion aberration diagram of the optical imaging lens group 100 from left to right. It can be seen from the longitudinal spherical aberration diagram that the three types of off-axis rays of visible light with wavelengths of 420nm, 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 change of the sagittal aberration in the entire field of view is within + 0.04mm; the meridian aberration is the focal length of the entire field of view. The amount of change is within + 0.03mm; and the distortion aberration can be controlled within 15%. As shown in FIG. 1B, the optical imaging lens assembly 100 of this embodiment has well corrected various aberrations, and meets the imaging quality requirements of the optical system. Second embodiment

Referring to FIGS. 2A and 2B, FIG. 2A is a schematic diagram of an optical imaging lens group according to a second embodiment of the present invention. FIG. 2B shows the longitudinal spherical aberration (Longitudinal Spherical Aberration), the astigmatism/Field Curvature (Astigmatism/Field Curvature) and the distortion aberration (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, and a fifth lens in sequence from the object side to the image side. Lens 205, sixth lens 206, seventh lens 207, and eighth lens 208. The optical imaging lens group 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 provided on the imaging surface 211 to form an imaging device (not marked separately).

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

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

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

The fourth lens 204 has a positive refractive power, its object side surface 204a is convex, its image side surface 204b is convex, and its object side surface 204a and image side surface 204b are spherical surfaces. The material of the fourth lens 204 is glass.

The fifth lens 205 has a positive refractive power, the object side surface 205a is convex, the image side surface 205b is convex, and both the object side surface 205a and the image side surface 205b are spherical surfaces. The material of the fifth lens 205 is glass.

The sixth lens element 206 has negative refractive power, its object side surface 206a is concave, its image side surface 206b is convex, and its object side surface 206a and image side surface 206b are spherical surfaces. The material of the sixth lens 206 is glass. The image side surface 205b of the fifth lens 205 and the object side surface 206a of the sixth lens 206 have the same radius of curvature, and are bonded to each other to form a cemented lens.

The seventh lens 207 has a negative refractive power, the object side surface 207a is concave, the image side surface 207b is convex, and the object side surface 207a and the image side surface 207b are spherical surfaces. The material of the seventh lens 207 is glass.

The eighth lens 208 has a positive refractive power, its object side surface 208a is convex, its image side surface 208b is concave, and its object side surface 208a and image side surface 208b are both 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 to filter out light in a specific wavelength range, for example, an infrared filter (IR Filter). The two 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 sensor 220, and its two surfaces 210a and 210b are flat surfaces, and the material is glass.

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

The detailed optical data and the aspheric coefficient of the lens surface of the optical imaging lens group 200 of the second embodiment are listed in Table 3 and Table 4, respectively. In the second embodiment, the curve equation of the aspheric surface is expressed as in the first embodiment. Second embodiment EFL = 7.59 mm, Fno = 1.7, HFOV = 43.4 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 -117.464 1.024 1.518 64.2 -12.08 glass 201b Spherical 6.635 3.300 Second lens 202a Spherical -9.554 2.153 2.008 25.4 -39.31 glass 202b Spherical -14.016 0.100 Third lens 203a Spherical 206.387 1.856 1.746 49.3 23.81 glass 203b Spherical -19.354 8.068 aperture ST unlimited 0.000 Fourth lens 204a Spherical 10.825 2.206 1.680 50.7 15.52 glass 204b Spherical -398.603 4.611 Fifth lens 205a Spherical 14.707 2.513 1.671 55.4 8.11 glass 205b (glued surface) Spherical -8.049 0.000 Sixth lens 206a (glued surface) Spherical -8.049 0.505 1.925 21.5 -10.77 glass 206b Spherical -43.164 3.320 Seventh lens 207a Spherical -8.627 0.556 1.620 36.6 -15.75 glass 207b Spherical -76.000 0.100 Eighth lens 208a Aspherical 9.975 2.244 1.838 37.2 19.50 glass 208b Aspherical 22.980 1.058 Filter element 209a flat unlimited 0.210 1.517 64.2 glass 209b flat unlimited 1.950 Protective glass 210a flat unlimited 0.500 1.517 64.2 glass 210b flat unlimited 0.405 Imaging surface 211 flat unlimited Reference wavelength: 555 nm Table Three Aspheric coefficients of the second embodiment surface 208a 208b K -4.91E+00 8.77E+00 A ₂ 0.00E+00 0.00E+00 A ₄ 4.01E-04 -6.13E-05 A ₆ -2.21E-06 -7.92E-07 A ₈ -9.19E-07 -1.30E-06 A ₁₀ 7.49E-08 9.70E-08 A ₁₂ -2.82E-09 -3.81E-09 A ₁₄ 3.52E-11 5.14E-11 Table Four

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 relational expressions (1) to (15). Conditional Numerical value f34/EFL 1.56 f1/f2 0.31 f8/EFL 2.57 |1/(f1*Nd1)+1/(f2*Nd2)+1/(f3*Nd3)+1/(f4*Nd4)+ 1/(f5*Nd5)+1/(f6*Nd6)+1 /(f7*Nd7)+1/(f8*Nd8)| 0.009 f56/EFL 3.65 |f78|/EFL 9.81 f6/f7 0.68 R4/R3 1.47 R14/R13 8.81 (C7+C8)/(C7-C8) 0.95 AT12/(CT1+CT2) 1.04 BFL/EFL 0.54 Dr1r6/(CT1+CT2+CT3) 1.68 Vd1-Vd2 38.8 Vd3+Vd4+Vd5 155.4 Table 5

Referring to FIG. 2B, from left to right are the longitudinal spherical aberration diagram, the astigmatic field curvature aberration 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 three types of off-axis rays of visible light with wavelengths of 420nm, 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 change of the sagittal aberration in the entire field of view is within + 0.03mm; the meridian aberration is the focal length of the entire field of view. The amount of change is within + 0.01mm; and the distortion aberration can be controlled within 30%. As shown in FIG. 2B, the optical imaging lens assembly 200 of this embodiment has well corrected various aberrations, and meets the imaging quality requirements of the optical system. The third embodiment

Referring to FIGS. 3A and 3B, FIG. 3A is a schematic diagram of an optical imaging lens group according to a third embodiment of the present invention. FIG. 3B shows the longitudinal spherical aberration (Longitudinal Spherical Aberration), the astigmatism/Field Curvature (Astigmatism/Field Curvature) and the distortion aberration (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, and a fifth lens in sequence from the object side to the image side. Lens 305, sixth lens 306, seventh lens 307, and eighth lens 308. The optical imaging lens group 300 may further include a filter element 309, a protective glass 310, and an imaging surface 311. An image sensing element 320 can be further provided on the imaging surface 311 to form an imaging device (not marked separately).

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

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

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

The fourth lens 304 has a positive refractive power, its object side surface 304a is convex, its image side surface 304b is convex, and its object side surface 304a and image side surface 304b are spherical surfaces. The material of the fourth lens 304 is glass.

The fifth lens 305 has positive refractive power, the object side surface 305a is convex, the image side surface 305b is convex, and both the object side surface 305a and the image side surface 305b are spherical surfaces. The material of the fifth lens 305 is glass.

The sixth lens element 306 has negative refractive power, its object side surface 306a is concave, its image side surface 306b is concave, and its object side surface 306a and image side surface 306b are spherical surfaces. The material of the sixth lens 306 is glass. The image side surface 305b of the fifth lens 305 and the object side surface 306a of the sixth lens 306 have the same radius of curvature and are bonded to each other to form a cemented lens.

The seventh lens 307 has negative refractive power, the object side surface 307a is concave, the image side surface 307b is convex, and the object side surface 307a and the image side surface 307b are spherical surfaces. The material of the seventh lens 307 is glass.

The eighth lens 308 has a positive refractive power, its object side surface 308a is convex, its image side surface 308b is concave, and its object side surface 308a and image side surface 308b are both 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, such as an infrared filter (IR Filter). Both surfaces 309a and 309b of the filter element 309 are flat surfaces, and the material is glass.

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

The image sensor (Image Sensor) 320 is, for example, a charge-coupled device (CCD) Image Sensor or a complementary metal oxide semiconductor sensor (CMOS Image Sensor).

The detailed optical data and the 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 first embodiment. The third embodiment EFL = 9.11 mm, Fno = 1.68, HFOV = 33.7 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 200.000 1.024 1.523 52.6 -13.52 glass 301b Spherical 6.819 3.332 Second lens 302a Spherical -8.960 2.153 1.811 25.4 -41.04 glass 302b Spherical -13.581 0.200 Third lens 303a Spherical 24.929 1.874 1.723 50.3 18.28 glass 303b Spherical -27.222 6.916 aperture ST unlimited 0.000 Fourth lens 304a Spherical 12.201 2.206 1.737 51.5 16.19 glass 304b Spherical -481.915 3.246 Fifth lens 305a Spherical 16.562 2.510 1.693 54.8 9.84 glass 305b (glued surface) Spherical -10.884 0.000 Sixth lens 306a (glued surface) Spherical -10.884 0.505 1.925 21.5 -11.47 glass 306b Spherical 430.075 4.679 Seventh lens 307a Spherical -7.439 0.500 1.616 37.0 -14.66 glass 307b Spherical -43.300 0.100 Eighth lens 308a Aspherical 9.230 2.193 1.814 40.9 18.65 glass 308b Aspherical 21.048 1.058 Filter element 309a flat unlimited 0.210 1.517 64.2 glass 309b flat unlimited 0.801 Protective glass 310a flat unlimited 0.500 1.517 64.2 glass 310b flat unlimited 0.435 Imaging surface 311 flat unlimited Reference wavelength: 555 nm Table 6 Aspheric coefficients of the third embodiment surface 308a 308b K -6.19E+00 5.20E+00 A ₂ 0.00E+00 0.00E+00 A ₄ 5.97E-04 -5.26E-05 A ₆ -1.06E-05 -8.74E-07 A ₈ -9.72E-07 -1.51E-06 A ₁₀ 7.99E-08 9.75E-08 A ₁₂ -2.75E-09 -3.58E-09 A ₁₄ 2.81E-11 4.55E-11 Table Seven

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 relational expressions (1) to (15). Conditional Numerical value f34/EFL 1.21 f1/f2 0.33 f8/EFL 2.05 |1/(f1*Nd1)+1/(f2*Nd2)+1/(f3*Nd3)+1/(f4*Nd4)+ 1/(f5*Nd5)+1/(f6*Nd6)+1 /(f7*Nd7)+1/(f8*Nd8)| 0.007 f56/EFL 5.53 |f78|/EFL 6.84 f6/f7 0.78 R4/R3 1.52 R14/R13 5.82 (C7+C8)/(C7-C8) 0.95 AT12/(CT1+CT2) 1.05 BFL/EFL 0.33 Dr1r6/(CT1+CT2+CT3) 1.70 Vd1-Vd2 27.2 Vd3+Vd4+Vd5 156.6 Table 8

Referring to FIG. 3B, from left to right, the longitudinal spherical aberration diagram, the astigmatic field curvature aberration diagram, and the distortion aberration diagram of the optical imaging lens group 300 are respectively shown from left to right. It can be seen from the longitudinal spherical aberration diagram that the three types of off-axis rays of visible light with wavelengths of 420nm, 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. From the astigmatic field curvature aberration diagram (wavelength 555nm), it can be seen that the focal length change of the sagittal aberration in the entire field of view is within + 0.02mm; the meridian aberration is the focal length of the entire field of view. The amount of change is within + 0.02mm; and the distortion aberration can be controlled within 20%. As shown in FIG. 3B, the optical imaging lens assembly 300 of this embodiment has well corrected various aberrations, and meets the imaging quality requirements of the optical system. Fourth embodiment

Referring to FIGS. 4A and 4B, FIG. 4A is a schematic diagram of an optical imaging lens group according to a fourth embodiment of the present invention. FIG. 4B shows the longitudinal spherical aberration map (Longitudinal Spherical Aberration), the astigmatism field curvature map (Astigmatism/Field Curvature) and the distortion aberration map (Distortion) in order from left to right of the fourth embodiment of the present invention.

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, and a fifth lens in sequence from the object side to the image side. Lens 405, sixth lens 406, seventh lens 407, and eighth lens 408. The optical imaging lens group 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 separately).

The first lens 401 has a negative refractive power, the object side 401a is convex, the image side 401b is concave, and the object side 401a and the image side 401b are both 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 convex, 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 surface 403a is convex, the image side surface 403b is convex, and both the object side surface 403a and the image side surface 403b are spherical surfaces. The material of the third lens 403 is glass.

The fourth lens 404 has a positive refractive power, its object side surface 404a is convex, its image side surface 404b is concave, and its object side surface 404a and image side surface 404b are spherical surfaces. The material of the fourth lens 404 is glass.

The fifth lens 405 has a positive refractive power, the object side surface 405a is convex, the image side surface 405b is convex, and both the object side surface 405a and the image side surface 405b are spherical surfaces. The material of the fifth lens 405 is glass.

The sixth lens element 406 has a negative refractive power, its object side surface 406a is concave, its image side surface 406b is convex, and its object side surface 406a and image side surface 406b are spherical surfaces. The material of the sixth lens 406 is glass. The image side surface 405b of the fifth lens 405 and the object side surface 406a of the sixth lens 406 have the same radius of curvature, and are bonded to each other to form a cemented lens.

The seventh lens 407 has a negative refractive power, the object side surface 407a is concave, the image side surface 407b is convex, and the object side surface 407a and the image side surface 407b are spherical surfaces. The material of the seventh lens 407 is glass.

The eighth lens 408 has a positive refractive power, its object side surface 408a is convex, its image side surface 408b is concave, and its object side surface 408a and image side surface 408b are both 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 to filter out light in a specific wavelength range, for example, an infrared filter (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 sensor 420, and its two surfaces 410a and 410b are flat surfaces, and its 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 the aspheric coefficients 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 = 8.94 mm, Fno = 1.68, HFOV = 34.2 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 350.000 1.024 1.543 47.2 -12.68 glass 401b Spherical 6.745 3.332 Second lens 402a Spherical -8.453 2.153 1.811 25.4 -46.72 glass 402b Spherical -12.122 0.300 Third lens 403a Spherical 19.043 3.342 1.723 50.2 17.89 glass 403b Spherical -37.285 5.000 aperture ST unlimited 0.000 Fourth lens 404a Spherical 13.000 2.206 1.737 51.5 18.27 glass 404b Spherical 353.739 3.539 Fifth lens 405a Spherical 14.574 2.350 1.702 51.1 9.01 glass 405b (glued surface) Spherical -10.421 0.000 Sixth lens 406a (glued surface) Spherical -10.421 0.896 1.931 20.9 -11.23 glass 406b Spherical -4116.524 4.373 Seventh lens 407a Spherical -8.406 1.000 1.629 35.6 -15.26 glass 407b Spherical -71.300 0.100 Eighth lens 408a Aspherical 9.307 2.193 1.814 40.9 19.27 glass 408b Aspherical 20.487 1.058 Filter element 409a flat unlimited 0.210 1.517 64.2 glass 409b flat unlimited 0.800 Protective glass 410a flat unlimited 0.500 1.517 64.2 glass 410b flat unlimited 0.295 Imaging surface 411 flat unlimited Reference wavelength: 555 nm Table 9 Aspheric coefficients of the fourth embodiment surface 108a 108b K -5.36E+00 6.86E+00 A ₂ 0.00E+00 0.00E+00 A ₄ 4.51E-04 -8.82E-05 A ₆ -4.54E-06 -1.89E-07 A ₈ -9.63E-07 -1.42E-06 A ₁₀ 7.52E-08 9.63E-08 A ₁₂ -2.84E-09 -3.69E-09 A ₁₄ 3.77E-11 5.19E-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 relational expressions (1) to (15). Conditional Numerical value f34/EFL 1.22 f1/f2 0.27 f8/EFL 2.16 |1/(f1*Nd1)+1/(f2*Nd2)+1/(f3*Nd3)+1/(f4*Nd4)+ 1/(f5*Nd5)+1/(f6*Nd6)+1 /(f7*Nd7)+1/(f8*Nd8)| 0.009 f56/EFL 4.02 |f78|/EFL 7.95 f6/f7 0.74 R4/R3 1.43 R14/R13 8.48 (C7+C8)/(C7-C8) 1.08 AT12/(CT1+CT2) 1.05 BFL/EFL 0.32 Dr1r6/(CT1+CT2+CT3) 1.56 Vd1-Vd2 21.8 Vd3+Vd4+Vd5 152.8 Table 11

4B, from left to right are the longitudinal spherical aberration diagram, the astigmatic field curvature aberration diagram, and the distortion aberration diagram of the optical imaging lens group 400 from left to right. It can be seen from the longitudinal spherical aberration diagram that the three types of off-axis rays of visible light with wavelengths of 420nm, 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 change of the sagittal aberration in the entire field of view is within + 0.02mm; the meridian aberration is the focal length of the entire field of view. The amount of change is within + 0.04mm; and the distortion aberration can be controlled within 15%. As shown in FIG. 4B, the optical imaging lens group 400 of this embodiment has well corrected various aberrations, and meets the imaging quality requirements of the optical system. Fifth embodiment

Referring to FIG. 5A and FIG. 5B, FIG. 5A is a schematic diagram of an optical imaging lens group according to a fifth embodiment of the present invention. FIG. 5B shows the longitudinal spherical aberration diagram (Longitudinal Spherical Aberration), the astigmatism field curvature (Astigmatism/Field Curvature) and the 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, and a fifth lens in sequence from the object side to the image side. Lens 505, sixth lens 506, seventh lens 507, and eighth lens 508. The optical imaging lens group 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 provided on the imaging surface 511 to form an imaging device (not marked separately).

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

The second lens 502 has a negative refractive power, the object side surface 502a is concave, the image side surface 502b is convex, and both the object side surface 502a and the image side surface 502b are spherical surfaces. 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 spherical. The material of the third lens 503 is glass.

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

The fifth lens 505 has a positive refractive power, the object side surface 505a is convex, the image side surface 505b is convex, and both the object side surface 505a and the image side surface 505b are spherical surfaces. The material of the fifth lens 505 is glass.

The sixth lens element 506 has negative refractive power, its object side surface 506a is concave, its image side surface 506b is concave, and its object side surface 506a and image side surface 506b are spherical surfaces. The material of the sixth lens 506 is glass. The image side surface 505b of the fifth lens 505 and the object side surface 506a of the sixth lens 506 have the same radius of curvature, and are bonded to each other to form a cemented lens.

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 eighth lens 508 has positive refractive power, its object side surface 508a is convex, its image side surface 508b is concave, and its object side surface 508a and image side surface 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 to filter out light in a specific wavelength range, for example, an infrared filter (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, and its two surfaces 510a and 510b are 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 complementary metal oxide semiconductor sensor (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 first embodiment. Fifth embodiment EFL = 9.69 mm, Fno = 1.68, HFOV = 31.0 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 50.000 1.076 1.549 53.6 -14.82 glass 501b Spherical 6.948 3.333 Second lens 502a Spherical -9.405 2.153 1.811 25.5 -50.37 glass 502b Spherical -13.471 0.300 Third lens 503a Spherical 17.245 3.531 1.723 50.2 19.41 glass 503b Spherical -68.781 5.000 aperture ST unlimited 0.000 Fourth lens 504a Spherical 12.189 2.206 1.737 51.5 17.44 glass 504b Spherical 220.442 3.574 Fifth lens 505a Spherical 12.637 1.778 1.702 51.1 9.25 glass 505b (glued surface) Spherical -12.565 0.000 Sixth lens 506a (glued surface) Spherical -12.565 1.380 1.931 21.3 -11.22 glass 506b Spherical 65.000 4.031 Seventh lens 507a Spherical -7.741 0.999 1.626 36.0 -12.95 glass 507b Spherical -184.602 0.100 Eighth lens 508a Aspherical 8.806 2.545 1.814 40.9 17.38 glass 508b Aspherical 20.312 1.058 Filter element 509a flat unlimited 0.210 1.517 64.2 glass 509b flat unlimited 0.800 Protective glass 510a flat unlimited 0.500 1.517 64.2 glass 510b flat unlimited 0.235 Imaging surface 511 flat unlimited Reference wavelength: 555 nm Table 12 Aspheric coefficients of the fifth embodiment surface 508a 508b K -4.62E+00 9.03E+00 A ₂ 0.00E+00 0.00E+00 A ₄ 3.20E-04 -1.80E-04 A ₆ 3.18E-08 4.37E-06 A ₈ -9.85E-07 -1.67E-06 A ₁₀ 7.00E-08 9.57E-08 A ₁₂ -2.82E-09 -3.68E-09 A ₁₄ 4.02E-11 5.32E-11 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 relational expressions (1) to (15). Conditional Numerical value f34/EFL 1.16 f1/f2 0.29 f8/EFL 1.79 |1/(f1*Nd1)+1/(f2*Nd2)+1/(f3*Nd3)+1/(f4*Nd4)+ 1/(f5*Nd5)+1/(f6*Nd6)+1 /(f7*Nd7)+1/(f8*Nd8)| 0.010 f56/EFL 4.08 |f78|/EFL 4.98 f6/f7 0.87 R4/R3 1.43 R14/R13 23.85 (C7+C8)/(C7-C8) 1.12 AT12/(CT1+CT2) 1.03 BFL/EFL 0.29 Dr1r6/(CT1+CT2+CT3) 1.54 Vd1-Vd2 28.1 Vd3+Vd4+Vd5 152.8 Table 14

Referring to FIG. 5B, from left to right are the longitudinal spherical aberration diagram, the astigmatic field curvature aberration 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 three types of off-axis rays of visible light with wavelengths of 420nm, 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. From the astigmatic field curvature aberration diagram (wavelength 555nm), it can be seen that the focal length change of the sagittal aberration in the entire field of view is within + 0.03mm; the meridian aberration is the focal length of the entire field of view. The amount of change is within + 0.03mm; and the distortion aberration can be controlled within 15%. As shown in FIG. 5B, the optical imaging lens assembly 500 of this embodiment has well corrected various aberrations 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 shows the longitudinal spherical aberration (Longitudinal Spherical Aberration), the astigmatism/Field Curvature (Astigmatism/Field Curvature) and the distortion aberration (Distortion) of the second 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, and a fifth lens in sequence from the object side to the image side. Lens 605, sixth lens 606, seventh lens 607, and eighth lens 608. The optical imaging lens group 600 can further include a filter element 609, a protective glass 610, and an imaging surface 611. An image sensing element 620 can be further provided on the imaging surface 611 to form an imaging device (not marked separately).

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

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

The third lens 603 has 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 spherical. The material of the third lens 603 is glass.

The fourth lens 604 has a positive refractive power, its object side surface 604a is convex, its image side surface 604b is concave, and its object side surface 604a and image side surface 604b are spherical surfaces. The material of the fourth lens 604 is glass.

The fifth lens 605 has a positive refractive power, the object side surface 605a is convex, the image side surface 605b is convex, and the object side surface 605a and the image side surface 605b are spherical surfaces. The material of the fifth lens 605 is glass.

The sixth lens element 606 has negative refractive power, its object side surface 606a is concave, its image side surface 606b is concave, and its object side surface 606a and image side surface 606b are spherical surfaces. The material of the sixth lens 606 is glass. The image side surface 605b of the fifth lens 605 and the object side surface 606a of the sixth lens 606 have the same radius of curvature, and are bonded to each other to form a cemented lens.

The seventh lens 607 has a negative refractive power, the object side surface 607a is concave, the image side surface 607b is convex, and the object side surface 607a and the image side surface 607b are spherical surfaces. The material of the seventh lens 607 is glass.

The eighth lens 608 has a positive refractive power, its object side surface 608a is convex, its image side surface 608b is concave, and its object side surface 608a and image side surface 608b are both 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 to filter out light in a specific wavelength range, for example, an infrared filter (IR Filter). The two surfaces 609a and 609b of the filter element 609 are flat surfaces, and the material is glass.

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

The image sensor (Image Sensor) 620 is, for example, a charge-coupled device (CCD) Image Sensor or a complementary metal oxide semiconductor sensor (CMOS Image Sensor).

The detailed optical data and the aspheric coefficients 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 first embodiment. Sixth embodiment EFL = 9.69 mm, Fno = 1.68, HFOV = 31.8 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 50.000 1.076 1.543 47.2 -14.83 glass 601b Spherical 6.880 3.333 Second lens 602a Spherical -9.172 2.153 1.800 28.4 -48.14 glass 602b Spherical -13.294 0.300 Third lens 603a Spherical 17.644 3.000 1.723 50.2 19.47 glass 603b Spherical -64.477 5.000 aperture ST unlimited 0.000 Fourth lens 604a Spherical 13.006 2.206 1.737 51.5 17.71 glass 604b Spherical 3937.061 3.574 Fifth lens 605a Spherical 12.803 2.300 1.702 51.1 9.24 glass 605b (glued surface) Spherical -12.160 0.000 Sixth lens 606a (glued surface) Spherical -12.160 1.380 1.931 21.3 -10.91 glass 606b Spherical 65.000 4.031 Seventh lens 607a Spherical -7.915 0.999 1.624 35.9 -13.65 glass 607b Spherical -116.900 0.100 Eighth lens 608a Aspherical 8.854 2.545 1.816 40.3 17.38 glass 608b Aspherical 20.523 1.058 Filter element 609a flat unlimited 0.210 1.517 64.2 glass 609b flat unlimited 0.800 Protective glass 610a flat unlimited 0.500 1.517 64.2 glass 610b flat unlimited 0.153 Imaging surface 611 flat unlimited Reference wavelength: 555 nm Table 15 Aspheric coefficients of the sixth embodiment surface 608a 608b K -4.82E+00 4.69E+00 A ₂ 0.00E+00 0.00E+00 A ₄ 4.66E-04 1.19E-04 A ₆ -6.55E-06 -6.66E-06 A ₈ -9.32E-07 -1.30E-06 A ₁₀ 7.80E-08 9.41E-08 A ₁₂ -2.90E-09 -3.52E-09 A ₁₄ 3.85E-11 5.00E-11 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 relational expressions (1) to (15). Conditional Numerical value f34/EFL 1.16 f1/f2 0.31 f8/EFL 1.79 |1/(f1*Nd1)+1/(f2*Nd2)+1/(f3*Nd3)+1/(f4*Nd4)+ 1/(f5*Nd5)+1/(f6*Nd6)+1 /(f7*Nd7)+1/(f8*Nd8)| 0.010 f56/EFL 4.21 |f78|/EFL 6.22 f6/f7 0.80 R4/R3 1.45 R14/R13 14.77 (C7+C8)/(C7-C8) 1.01 AT12/(CT1+CT2) 1.03 BFL/EFL 0.28 Dr1r6/(CT1+CT2+CT3) 1.58 Vd1-Vd2 18.8 Vd3+Vd4+Vd5 152.8 Table 17

Referring to FIG. 6B, from left to right, the longitudinal spherical aberration diagram, the astigmatic field curvature aberration diagram, and the distortion aberration diagram of the optical imaging lens group 600 are respectively shown from left to right. It can be seen from the longitudinal spherical aberration diagram that the three types of off-axis rays of visible light with wavelengths of 420nm, 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 change of the sagittal aberration in the entire field of view is within + 0.03mm; the meridian aberration is the focal length of the entire field of view. The amount of change is within + 0.03mm; and the distortion aberration can be controlled within 12%. As shown in FIG. 6B, the optical imaging lens assembly 600 of this embodiment has well corrected various aberrations, and meets the imaging quality requirements of the optical system. Seventh embodiment

Referring to FIGS. 7A and 7B, FIG. 7A is a schematic diagram of an optical imaging lens group according to a seventh embodiment of the present invention. FIG. 7B shows the longitudinal spherical aberration (Longitudinal Spherical Aberration), the astigmatism/Field Curvature (Astigmatism/Field Curvature) and the distortion aberration (Distortion) of the seventh embodiment of the present invention 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, and a fifth lens in sequence from the object side to the image side. Lens 705, sixth lens 706, seventh lens 707, and eighth lens 708. The optical imaging lens group 700 may further include a filter element 709, a protective glass 710, and an imaging surface 711. An image sensing element 720 can be further provided on the imaging surface 711 to form an imaging device (not marked separately).

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

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

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

The fourth lens 704 has positive refractive power, its object side surface 704a is convex, its image side surface 704b is convex, and its object side surface 704a and image side surface 704b are spherical surfaces. 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 the object side 705a and the image side 705b are both spherical. The material of the fifth lens 705 is glass.

The sixth lens element 706 has negative refractive power, its object side surface 706a is concave, its image side surface 706b is concave, and its object side surface 706a and image side surface 706b are spherical surfaces. The material of the sixth lens 706 is glass. Wherein, the image side surface 705b of the fifth lens 705 and the object side surface 706a of the sixth lens 706 have the same radius of curvature, and are bonded to each other to form a cemented lens.

The seventh lens 707 has a negative refractive power, the object side surface 707a is concave, the image side surface 707b is convex, and the object side surface 707a and the image side surface 707b are spherical surfaces. The material of the seventh lens 707 is glass.

The eighth lens 708 has a positive refractive power, its object side surface 708a is convex, its image side surface 708b is concave, and its object side surface 708a and image side surface 708b are both 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 to filter out light in a specific wavelength range, for example, an infrared filter (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 sensor 720, and its two surfaces 710a and 710b are 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 complementary metal oxide semiconductor sensor (CMOS Image Sensor).

The detailed optical data and the aspheric coefficients 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 first embodiment. Seventh embodiment EFL = 8.19 mm, Fno = 1.67, HFOV = 39.4 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 -72.128 1.076 1.543 47.2 -12.78 glass 701b Spherical 7.718 3.333 Second lens 702a Spherical -9.020 3.077 1.811 25.5 -76.63 glass 702b Spherical -12.164 0.300 Third lens 703a Spherical 24.636 5.000 1.703 48.1 29.24 glass 703b Spherical -113.368 6.000 aperture ST unlimited 0.000 Fourth lens 704a Spherical 14.523 2.200 1.737 51.5 17.85 glass 704b Spherical -129.684 4.546 Fifth lens 705a Spherical 13.300 3.000 1.702 51.1 9.08 glass 705b (glued surface) Spherical -11.107 0.000 Sixth lens 706a (glued surface) Spherical -11.107 2.000 1.931 21.3 -10.45 glass 706b Spherical 85.000 4.031 Seventh lens 707a Spherical -11.415 0.999 1.623 36.3 -20.70 glass 707b Spherical -102.420 0.100 Eighth lens 708a Aspherical 9.637 2.545 1.814 40.9 19.67 glass 708b Aspherical 21.355 1.058 Filter element 709a flat unlimited 0.210 1.517 64.2 glass 709b flat unlimited 0.800 Protective glass 710a flat unlimited 0.500 1.517 64.2 glass 710b flat unlimited 0.320 Imaging surface 711 flat unlimited Reference wavelength: 555 nm Table 18 Aspheric coefficients of the seventh embodiment surface 708a 708a K -6.32E+00 8.95E+00 A ₂ 0.00E+00 0.00E+00 A ₄ 5.94E-04 -5.47E-05 A ₆ -9.99E-06 -7.34E-06 A ₈ -9.52E-07 -1.07E-06 A ₁₀ 8.10E-08 8.12E-08 A ₁₂ -2.83E-09 -3.02E-09 A ₁₄ 3.48E-11 4.04E-11 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 relational expressions (1) to (15). Conditional Numerical value f34/EFL 1.65 f1/f2 0.17 f8/EFL 2.40 |1/(f1*Nd1)+1/(f2*Nd2)+1/(f3*Nd3)+1/(f4*Nd4)+ 1/(f5*Nd5)+1/(f6*Nd6)+1 /(f7*Nd7)+1/(f8*Nd8)| 0.008 f56/EFL 4.98 |f78|/EFL 63.91 f6/f7 0.50 R4/R3 1.35 R14/R13 8.97 (C7+C8)/(C7-C8) 0.80 AT12/(CT1+CT2) 0.80 BFL/EFL 0.35 Dr1r6/(CT1+CT2+CT3) 1.40 Vd1-Vd2 21.7 Vd3+Vd4+Vd5 150.7 Table Twenty

Referring to FIG. 7B, from left to right, the longitudinal spherical aberration diagram, the astigmatic field curvature aberration diagram, and the distortion aberration diagram of the optical imaging lens group 700 are respectively shown from left to right. It can be seen from the longitudinal spherical aberration diagram that the three types of off-axis rays of visible light with wavelengths of 420nm, 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 change of the sagittal aberration in the entire field of view is within + 0.01mm; the meridian aberration is the focal length of the entire field of view. The amount of change is within + 0.02mm; and the distortion aberration can be controlled within 25%. As shown in FIG. 7B, the optical imaging lens assembly 700 of this embodiment has well corrected various aberrations, and meets the imaging quality requirements of the optical system. Eighth embodiment

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

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, and a fifth lens in sequence from the object side to the image side. Lens 805, sixth lens 806, seventh lens 807, and 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 provided on the imaging surface 811 to form an imaging device (not marked separately).

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 surface 802a is concave, the image side surface 802b is convex, and both the object side surface 802a and the image side surface 802b are spherical surfaces. The material of the second lens 802 is glass.

The third lens 803 has 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 spherical. The material of the third lens 803 is glass.

The fourth lens 804 has a positive refractive power, its object side surface 804a is convex, its image side surface 804b is concave, and its object side surface 804a and image side surface 804b are spherical surfaces. The material of the fourth lens 804 is glass.

The fifth lens 805 has positive refractive power, the object side surface 805a is convex, the image side surface 805b is convex, and the object side surface 805a and the image side surface 805b are spherical surfaces. The material of the fifth lens 805 is glass.

The sixth lens element 806 has negative refractive power, its object side surface 806a is concave, its image side surface 806b is concave, and its object side surface 806a and image side surface 806b are spherical surfaces. The material of the sixth lens 806 is glass. The image side surface 805b of the fifth lens 805 and the object side surface 806a of the sixth lens 806 have the same radius of curvature, and are bonded to each other to form a cemented lens.

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 eighth lens 808 has a positive refractive power, its object side surface 808a is convex, its image side surface 808b is concave, and its object side surface 808a and image side surface 808b are both 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 to filter out light in a specific wavelength range, for example, an infrared filter (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, and its two surfaces 810a and 810b are flat surfaces, and the material is glass.

The image sensor (Image Sensor) 820 is, for example, a charge-coupled device (CCD) Image Sensor or a complementary metal oxide semiconductor sensor (CMOS Image Sensor).

The detailed optical data and the aspheric coefficients of the lens surface of the optical imaging lens group 800 of the eighth embodiment 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 first embodiment. Eighth embodiment EFL = 4.5 mm, Fno = 1.66, HFOV = 50.98 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 70.000 1.024 1.528 66.2 -10.03 glass 801b Spherical 4.900 6.140 Second lens 802a Spherical -6.989 2.153 1.856 24.1 -26.96 glass 802b Spherical -11.450 0.100 Third lens 803a Spherical 13.715 1.874 1.693 54.8 16.93 glass 803b Spherical -76.793 3.459 aperture ST unlimited 0.000 Fourth lens 804a Spherical 9.333 2.206 1.700 48.5 14.43 glass 804b Spherical 111.784 0.964 Fifth lens 805a Spherical 8.144 2.466 1.703 48.1 6.72 glass 805b (glued surface) Spherical -9.840 0.000 Sixth lens 806a (glued surface) Spherical -9.840 0.505 1.931 20.9 -8.86 glass 806b Spherical 52.201 2.000 Seventh lens 807a Spherical -6.879 0.500 1.651 33.8 -17.41 glass 807b Spherical -18.000 0.100 Eighth lens 808a Aspherical 7.845 2.001 1.819 46.6 16.70 glass 808b Aspherical 16.278 1.300 Filter element 809a flat unlimited 0.400 1.517 64.2 glass 809b flat unlimited 0.500 Protective glass 810a flat unlimited 0.500 1.517 64.2 glass 810b flat unlimited 0.436 Imaging surface 811 flat unlimited Reference wavelength: 555 nm Table 21 Aspheric coefficients of the eighth embodiment surface 808a 808b K -4.61E+00 6.73E+00 A ₂ 0.00E+00 0.00E+00 A ₄ 3.54E-04 -7.54E-05 A ₆ -4.23E-06 -5.95E-07 A ₈ -9.30E-07 -1.29E-06 A ₁₀ 7.47E-08 9.78E-08 A ₁₂ -2.80E-09 -3.78E-09 A ₁₄ 3.73E-11 5.22E-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 meets the requirements of relational expressions (1) to (15). Conditional Numerical value f34/EFL 2.00 f1/f2 0.37 f8/EFL 3.71 |1/(f1*Nd1)+1/(f2*Nd2)+1/(f3*Nd3)+1/(f4*Nd4)+ 1/(f5*Nd5)+1/(f6*Nd6)+1 /(f7*Nd7)+1/(f8*Nd8)| 0.017 f56/EFL 4.38 |f78|/EFL 168.49 f6/f7 0.51 R4/R3 1.64 R14/R13 2.62 (C7+C8)/(C7-C8) 1.18 AT12/(CT1+CT2) 1.93 BFL/EFL 0.70 Dr1r6/(CT1+CT2+CT3) 2.24 Vd1-Vd2 42.1 Vd3+Vd4+Vd5 151.4 Table 23

Referring to FIG. 8B, from left to right, the longitudinal spherical aberration diagram, the astigmatic field curvature aberration diagram, and the distortion aberration diagram of the optical imaging lens group 800 are respectively shown from left to right. It can be seen from the longitudinal spherical aberration diagram that the three types of off-axis rays of visible light with wavelengths of 420nm, 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 change of the sagittal aberration in the entire field of view is within + 0.03mm; the meridian aberration is the focal length of the entire field of view. The amount of change is within + 0.04mm; and the distortion aberration can be controlled within 10%. As shown in FIG. 8B, the optical imaging lens assembly 800 of this embodiment has well corrected various aberrations and meets the imaging quality requirements of the optical system. Ninth embodiment

The ninth embodiment of the present invention is an imaging device. The imaging device includes the optical imaging lens group as described in the first to eighth embodiments and an image sensing element; wherein, the image sensing element is, for example, disposed on the optical imaging lens The imaging surface of the group. The image sensing element is, for example, a Charge-Coupled Device (CCD) or a Complementary Metal Oxide Semiconductor (CMOS) image sensing element. This imaging device is, for example, a camera module for car 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 in the figure, the electronic device 1000 includes an imaging device 1010. The imaging device 1010 is, for example, the imaging device of the aforementioned ninth embodiment, which can 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 car camera, a surveillance camera, or an aerial camera.

Although the present invention is described using the foregoing several embodiments, these embodiments are not intended to limit the scope of the present invention. For those with ordinary knowledge in the technical field to which the present invention belongs, without departing from the spirit and scope of the present invention, various changes in form and details can be made with reference to the contents of the embodiments disclosed in the present invention. Therefore, it should be understood here that the present invention is subject to the scope of the following patent applications. Any changes made within the scope of the patent application 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 camera lens group 101, 201, 301, 401, 501, 601, 701, 801: first lens 102, 202, 302, 402, 502, 602, 702, 802: second lens 103, 203, 303, 403, 503, 603, 703, 803: 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 element 110, 210, 310, 410, 510, 610, 710, 810: protective glass 111, 211, 311, 411, 511, 611, 711, 811: imaging surface 101a, 201a, 301a, 401a, 501a, 601a, 701a, 801a: the object 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 object 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 object 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 object 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 object 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 object 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 object 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 object side 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: two surfaces of protective glass 120, 220, 320, 420, 520, 620, 720, 820: image sensor 1000: Electronic device 1010: imaging device I: Optical axis ST: Aperture

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

100: Optical camera lens group

101: The first lens

102: second lens

103: 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: Object side of the first lens

101b: the side of the image of the first lens

102a: Object side of the second lens

102b: The side of the image of the second lens

103a: The object side of the third lens

103b: The image side of the third lens

104a: The object side of the fourth lens

104b: The side of the image of the fourth lens

105a: The object side of the fifth lens

105b: The side of the image of the fifth lens

106a: The object side of the sixth lens

106b: The side of the image of the sixth lens

107a: The object side of the seventh lens

107b: The image side of the seventh lens

108a: The object side of the eighth lens

108b: The side of the image of the eighth lens

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

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

120: image sensor

I: Optical axis

ST: Aperture

Claims (18)

An optical camera lens group, from the object side to the image side, sequentially includes: A first lens with negative refractive power and a concave image side surface; A second lens with negative refractive power, the object side surface is concave, and the image side surface is convex; A third lens with positive refractive power, and its image side surface is convex; One aperture A fourth lens, with positive refractive power, and its object side surface is convex; A fifth lens, with positive refractive power, the object side surface is convex, and the image side surface is convex; A sixth lens with negative refractive power and a concave object side surface, wherein the fifth lens and the sixth lens constitute a cemented lens; A seventh lens with negative refractive power, the object side surface is concave, and the image side surface is convex; and An eighth lens with positive refractive power, the object side is convex, and the image side is concave; wherein the total number of lenses in the optical imaging lens group is eight; wherein the combined focal length of the third lens and the fourth lens is f34, the effective focal length of the optical camera lens group is EFL, which satisfies the following relationship: 1<f34/EFL<3. For example, the optical imaging lens group of item 1 in the scope of patent application, wherein the focal length of the first lens is f1, and the focal length of the second lens is f2, which satisfies the following relationship: 0.1<f1/f2<0.7. For example, the optical imaging lens group of item 1 of the scope of patent application, wherein the focal length of the eighth lens is f8, and the effective focal length EFL of the optical imaging lens group satisfies the following relationship: 1.6<f8/EFL<5. An optical camera lens group, from the object side to the image side, sequentially includes: A first lens with negative refractive power and a concave image side surface; A second lens with negative refractive power, the object side surface is concave, and the image side surface is convex; A third lens with positive refractive power, and its image side surface is convex; One aperture A fourth lens, with positive refractive power, and its object side surface is convex; A fifth lens, with positive refractive power, the object side surface is convex, and the image side surface is convex; A sixth lens with negative refractive power and a concave object side surface, wherein the fifth lens and the sixth lens constitute a cemented lens; A seventh lens with negative refractive power, the object side surface is concave, and the image side surface is convex; and An eighth lens with positive refractive power, the object side is convex and the image side is concave; wherein the total number of lenses in the optical imaging lens group is eight; the focal length of the first lens is f1, and the focal length of the second lens Is f2, the focal length of the eighth lens is f8, and the effective focal length of the optical imaging lens group is EFL, which satisfies the following relationship: 0.1<f1/f2<0.7; and 1.6<f8/EFL<5. For example, the optical imaging lens group of item 1 or item 4 of the scope of patent application, wherein the focal length of the first lens is f1, the focal length of the second lens is f2, the focal length of the third lens is f3, and the focal length of the fourth lens is f4 , The focal length of the fifth lens f5, the focal length of the sixth lens f6, the focal length of the seventh lens f7 and the focal length of the eighth lens f8, and the refractive index of the first lens Nd1, the refractive index of the second lens Nd2, refractive index of the third lens Nd3, refractive index of the fourth lens Nd4, refractive index of the fifth lens Nd5, refractive index of the sixth lens Nd6, refractive index of the seventh lens Nd7 and the eighth lens The refractive index Nd8 of the lens satisfies the following relationship:

. For example, the optical imaging lens group of item 1 or 4 of the scope of patent application, wherein the combined focal length of the fifth lens and the sixth lens is f56, and the effective focal length EFL of the optical imaging lens group satisfies the following Relationship: 2<f56/EFL/6. For example, the optical imaging lens group of item 1 or 4 of the scope of patent application, wherein the combined focal length of the seventh lens and the eighth lens is f78, and the effective focal length EFL of the optical imaging lens group satisfies the following Relationship: 2.5<|f78|/EFL<180. For example, the optical imaging lens set of item 1 or item 4 of the scope of patent application, wherein the focal length of the sixth lens is f6, and the focal length of the seventh lens is f7, which satisfies the following relationship: 0.3<f6/f7<1.2. For example, the optical imaging lens set of item 1 or item 4 of the scope of patent application, wherein the curvature radius of the second lens object side is R3, and the curvature radius of the image side is R4, which satisfies the following relationship: 1<R4/R3<2. For example, the optical imaging lens group of item 1 or item 4 of the scope of patent application, wherein the curvature radius of the seventh lens object side is R13, and the curvature radius of the image side is R14, which satisfies the following relationship: 2<R14/R13<25. For example, the optical imaging lens set of item 1 or item 4 of the scope of patent application, wherein the curvature of the object side of the fourth lens is C7 and the curvature of the image side is C8, which satisfies the following relationship: 0.5

1.5. For example, the optical imaging lens set of item 1 or item 4 of the scope of patent application, wherein the distance from the image side surface of the first lens to the object side surface of the second lens on the optical axis is AT12, and the distance between the first lens on the optical axis The thickness is CT1, and the thickness of the second lens on the optical axis is CT2, which satisfies the following relationship: 0.6<AT12/(CT1+CT2)<2.3. For example, the optical imaging lens group of item 1 or item 4 of the scope of patent application, wherein the distance from the image side surface of the eighth lens to the imaging surface of the optical imaging lens group on the optical axis is BFL, and the distance between it and the optical imaging lens group Between the effective focal length EFL, the following relationship is satisfied: 0.2<BFL/EFL<0.8. For example, the optical imaging lens set of item 1 or item 4 of the scope of patent application, wherein the distance from the object side of the first lens to the image side of the third lens on the optical axis is Dr1r6, and the first lens is on the optical axis The thickness of the second lens is CT1, the thickness of the second lens on the optical axis is CT2, and the thickness of the third lens on the optical axis is CT3, which satisfies the following relationship: 1.2<Dr1r6/(CT1+CT2+CT3)<2.5. For example, the optical imaging lens set of item 1 or item 4 of the scope of patent application, wherein the dispersion coefficient of the first lens is Vd1, and the dispersion coefficient of the second lens is Vd2, which satisfies the following relationship: 16<Vd1-Vd2<45. For example, the optical imaging lens set of item 1 or item 4 of the scope of patent application, wherein the dispersion coefficient of the third lens is Vd3, the dispersion coefficient of the fourth lens is Vd4, and the dispersion coefficient of the fifth lens is Vd5, Department satisfies the following relationship: 120<Vd3+Vd4+Vd5<180. An imaging device includes an optical imaging lens group as claimed in item 1 or item 4 of the scope of patent application, and an image sensing element, wherein the image sensing element is arranged on the imaging surface of the optical imaging lens group. An electronic device including the imaging device as claimed in item 17 of the scope of patent application.

Images