TWI569034B - Six-piece optical lens system - Google Patents

Description

Six-piece imaging lens set

The present invention relates to a lens set for an optical lens, and more particularly to a six-piece imaging lens set.

In recent years, with the rise of mobile phone cameras, the demand for miniaturized photographic lenses has been increasing, and the photosensitive elements of general photographic lenses are nothing more than a Charge Coupled Device (CCD) or a Complementary Metallic Semiconductor (Complementary Metal). -Oxide Semiconductor (CMOS), due to the advancement of semiconductor process technology, the pixel area of the photosensitive element is reduced, and the miniaturized photographic lens is gradually developing into the high-pixel field. Therefore, the requirements for image quality are increasing.

The miniaturized photographic lens that is traditionally used in portable electronic products mainly uses a four-piece lens structure, but since the pixel of the mobile phone camera climbs very rapidly, the pixel area of the photosensitive element is gradually reduced, and the system is imaged. In the case of ever-increasing quality requirements, the conventional four-piece lens set will not be able to meet higher-order photographic lens modules, and the trend of electronic products will continue to be thinner and lighter.

Therefore, how to develop an imaging lens set that can solve the above drawbacks is the motivation for the development of the present invention.

The object of the present invention is to provide a six-piece imaging lens set which can be applied to a high-resolution mobile phone camera without causing the total length of the lens to be too long, and at the same time having a large picture angle, a large aperture, a high number of pictures, and a high resolution. A six-piece imaging lens set with the ability and low lens height.

In order to achieve the foregoing objective, a six-piece imaging lens set according to the present invention comprises, in order from the object side to the image side, an aperture; a first lens having a positive refractive power, the object side surface of which is a convex surface, and at least one side of the object side surface and the image side surface of the first lens is aspherical; a second lens having a negative refractive power, the object side surface is a convex surface, and the object side surface and the image of the second lens At least one side of the side surface is aspherical; a third lens having a positive refractive power, the image side surface is concave, and the object side surface and the image side surface of the third lens have at least one side aspherical; a negative inflection The fourth lens of the force has a concave side on the image side surface, and at least one side of the object side surface and the image side surface of the fourth lens is aspherical; a fifth lens having a positive refractive power, the object side surface is convex, And at least one side of the object side surface and the image side surface of the fifth lens is aspherical; a sixth lens having a negative refractive power, the object side surface is a concave surface, and the object side surface and the image side surface of the sixth lens At least one side is aspherical.

In this way, the six-piece imaging lens group can be applied to a high-resolution mobile phone camera without causing the total length of the lens to be too long, while having a large picture angle, a large aperture, a high number of pictures, a high resolution, and a low lens height. .

Preferably, the focal length of the first lens is f1, the focal length of the second lens is f2, and the following condition is satisfied: -0.75 < f1/f2 < -0.35. Therefore, when f1/f2 satisfies the foregoing relationship, the six-piece imaging lens group can have a large picture angle, a large aperture, a high number of pictures, and a low lens height, and the resolution capability is significantly improved. The above range of optical data values results in problems with the performance, low resolution, and insufficient yield of the six-piece imaging lens set.

Preferably, the focal length of the second lens is f2, the focal length of the third lens is f3, and the following condition is satisfied: -0.5 < f2 / f3 < -0.1. Thereby, when f2/f3 satisfies the foregoing relationship, the six-piece imaging lens group can have a large picture angle, a large aperture, a high number of pictures, and a low lens height, and the resolution capability is remarkable. Raising, on the other hand, if the above optical data value range is exceeded, the performance, low resolution, and insufficient yield of the six-piece imaging lens group may be caused.

Preferably, the focal length of the third lens is f3, the focal length of the fourth lens is f4, and the following condition is satisfied: -3.0 < f3 / f4 < -1.5. Therefore, when f3/f4 satisfies the foregoing relationship, the six-piece imaging lens group can have a large picture angle, a large aperture, a high number of pictures, and a low lens height, and the resolution capability is significantly improved. The above range of optical data values results in problems with the performance, low resolution, and insufficient yield of the six-piece imaging lens set.

Preferably, the fourth lens has a focal length of f4, and the fifth lens has a focal length of f5 and satisfies the following condition: -5.5 < f4 / f5 < -3.5. Therefore, when f4/f5 satisfies the foregoing relationship, the six-piece imaging lens group can have a large picture angle, a large aperture, a high number of pictures, and a low lens height, and the resolution capability is significantly improved. The above range of optical data values results in problems with the performance, low resolution, and insufficient yield of the six-piece imaging lens set.

Preferably, the focal length of the fifth lens is f5, the focal length of the sixth lens is f6, and the following condition is satisfied: -1.3 < f5 / f6 < -0.8. Therefore, when f5/f6 satisfies the foregoing relationship, the six-piece imaging lens group can have a large picture angle, a large aperture, a high number of pictures, and a low lens height, and the resolution capability is significantly improved. The above range of optical data values results in problems with the performance, low resolution, and insufficient yield of the six-piece imaging lens set.

Preferably, the combined focal length of the first lens and the second lens is f12, and the combined focal length of the third lens and the fourth lens is f34, and the following condition is satisfied: -0.5 < f12 / f34 < -0.1. Therefore, when f12/f34 satisfies the foregoing relationship, the six-piece imaging lens group can have a large picture angle, a large aperture, a high number of pictures, and a low lens height, and the resolution capability is significantly improved. The above range of optical data values results in problems with the performance, low resolution, and insufficient yield of the six-piece imaging lens set.

Preferably, the combined focal length of the third lens and the fourth lens is f34, and the combined focal length of the fifth lens and the sixth lens is f56, and the following condition is satisfied: -1.9 < f34 / f56 < -1.3. Thereby, when f34/f56 If the above relationship is satisfied, the six-piece imaging lens set can have a large picture angle, a large aperture, a high number of pictures, and a low lens height, and the resolution capability is significantly improved. Conversely, if the optical data value range is exceeded. This can lead to problems with the performance, low resolution, and insufficient yield of the six-piece imaging lens set.

Preferably, the combined focal length of the second lens and the third lens is f23, and the focal length of the fourth lens and the fifth lens is f45, and the following condition is satisfied: -4.0 < f23 / f45 < -2.5. When f23/f45 satisfies the foregoing relationship, the six-piece imaging lens group can have a large picture angle, a large aperture, a high number of pictures, and a low lens height, and the resolution capability is remarkably improved. Conversely, if the above optical type is exceeded The range of data values results in problems with the performance, low resolution, and insufficient yield of the six-piece imaging lens set.

Preferably, the combined focal length of the first lens, the second lens and the third lens is f123, and the overall focal length of the six-piece imaging lens group is f, and the following condition is satisfied: 0.7 < f123 / f < 1.4. Therefore, when f123/f satisfies the foregoing relationship, the six-piece imaging lens group can have a large picture angle, a large aperture, a high number of pictures, and a low lens height, and the resolution capability is significantly improved. The above range of optical data values results in problems with the performance, low resolution, and insufficient yield of the six-piece imaging lens set.

Preferably, the combined focal length of the fourth lens, the fifth lens and the sixth lens is f456, and the overall focal length of the six-piece imaging lens group is f, and the following condition is satisfied: -9.0 < f456 / f < -2.5. Therefore, when f456/f satisfies the foregoing relationship, the six-piece imaging lens group can have a large picture angle, a large aperture, a high number of pictures, and a low lens height, and the resolution capability is significantly improved, and vice versa. The above range of optical data values results in problems with the performance, low resolution, and insufficient yield of the six-piece imaging lens set.

Preferably, the combined focal length of the first lens and the second lens is f12, and the combined focal length of the third lens, the fourth lens and the fifth lens is f345, and the following condition is satisfied: 1.8<f12/f345<2.6. Therefore, when f12/f345 satisfies the foregoing relationship, the six-piece imaging lens group can have a large picture angle, a large aperture, a high number of pictures, and a low lens height, and the resolution capability is significantly improved. Above light The range of data values of the formula will result in problems such as low performance, low resolution, and insufficient yield of the six-piece imaging lens set.

Preferably, the combined focal length of the second lens, the third lens and the fourth lens is f234, and the combined focal length of the fifth lens and the sixth lens is f56, and the following conditions are satisfied: -0.55<f234/f56<-0.2 . Therefore, when f234/f56 satisfies the foregoing relationship, the six-piece imaging lens group can have a large picture angle, a large aperture, a high number of pictures, and a low lens height, and the resolution capability is significantly improved. The above range of optical data values results in problems with the performance, low resolution, and insufficient yield of the six-piece imaging lens set.

Preferably, the overall focal length of the six-piece imaging lens group is f, the distance from the object side surface of the first lens to the imaging surface on the optical axis is TL, and the following condition is satisfied: 0.6 < f / TL < 1.0. Therefore, when the f/TL satisfies the foregoing relationship, the six-image imaging lens group can have a large picture angle, a large aperture, a high number of pictures, and a low lens height, and the resolution capability is significantly improved. The above range of optical data values results in problems with the performance, low resolution, and insufficient yield of the six-piece imaging lens set.

The present invention has been described with reference to the preferred embodiments of the present invention in accordance with the accompanying drawings.

100, 200‧‧ ‧ aperture

110, 210‧‧‧ first lens

111, 211‧‧‧ object side surface

112, 212‧‧‧ image side surface

120, 220‧‧‧ second lens

121, 221‧‧‧ object side surface

122, 222‧‧‧ image side surface

130, 230‧‧‧ third lens

131, 231‧‧‧ object side surface

132, 232‧‧‧ image side surface

140, 240‧‧‧ fourth lens

141, 241‧‧‧ side surface

142, 242‧‧‧ image side surface

150, 250‧‧‧ fifth lens

151, ‧ ‧ ‧ ‧ side surface

152, 252‧‧‧ image side surface

160, 260‧‧‧ sixth lens

161, ‧ ‧ ‧ side surface

162, 262‧‧‧ image side surface

170, 270‧‧‧ Infrared filter components

180, 280‧‧ ‧ imaging surface

190, 290‧‧‧ optical axis

f‧‧‧Six-piece imaging lens set

F1‧‧‧The focal length of the first lens

F2‧‧‧The focal length of the second lens

f3‧‧‧The focal length of the third lens

F4‧‧‧Focus of the fourth lens

f5‧‧‧Focus of the fifth lens

F6‧‧‧The focal length of the sixth lens

F12‧‧‧ Combination focal length of the first lens and the second lens

F34‧‧‧ Combination focal length of the third lens and the fourth lens

F56‧‧‧ Combination focal length of the fifth lens and the sixth lens

F23‧‧‧ Combination focal length of the second lens and the third lens

F45‧‧‧The focal length of the fourth lens and the fifth lens

f123‧‧‧The combined focal length of the first lens, the second lens and the third lens

f456‧‧‧The combined focal length of the fourth lens, the fifth lens and the sixth lens

F345‧‧‧The combined focal length of the third lens, the fourth lens and the fifth lens

f234‧‧‧The combined focal length of the second lens, the third lens and the fourth lens

TL‧‧‧The distance from the object side surface of the first lens to the imaging surface on the optical axis

1A is a schematic view of a six-piece imaging lens set of a first embodiment of the present invention.

Fig. 1B is a left-to-right sequence of spherical aberration, astigmatism, and distortion of the six-piece imaging lens group of the first embodiment.

2A is a schematic view of a six-piece imaging lens set of a second embodiment of the present invention.

2B is a spherical aberration, astigmatism, and distortion curve of the six-piece imaging lens group of the second embodiment, from left to right.

<First Embodiment>

1A and FIG. 1B, FIG. 1A is a schematic diagram of a six-piece imaging lens set according to a first embodiment of the present invention, and FIG. 1B is an image curvature and distortion of the six-piece imaging lens unit of the first embodiment. The difference, and the spherical aberration curve. As can be seen from FIG. 1A, the six-piece imaging lens assembly includes an aperture 100 and an optical group. The optical group sequentially includes a first lens 110, a second lens 120, a third lens 130, and a fourth from the object side to the image side. The lens 140, the fifth lens 150, the sixth lens 160, the infrared filter element 170, and the imaging surface 180, wherein the six-piece imaging lens group has six refractive lenses. The aperture 100 is disposed between the image side surface 112 of the first lens 110 and the object.

The first lens 110 has a positive refractive power and is made of a plastic material. The object side surface 111 is convex at the near optical axis 190, and the image side surface 112 is concave at the near optical axis 190, and the object side surface 111 and the image side are Surface 112 is aspherical.

The second lens 120 has a negative refractive power and is made of a plastic material. The object side surface 121 is convex at the near optical axis 190, and the image side surface 122 is concave at the near optical axis 190, and the object side surface 121 and the image side are Surface 122 is aspherical.

The third lens 130 has a positive refractive power and is made of a plastic material. The object side surface 131 is convex at the near optical axis 190, and the image side surface 132 is concave at the near optical axis 190, and the object side surface 131 and the image side are The surfaces 132 are all aspherical.

The fourth lens 140 has a negative refractive power and is made of a plastic material. The object side surface 141 is concave at the near optical axis 190, and the image side surface 142 is concave at the near optical axis 190, and the object side surface 141 and the image side are Surfaces 142 are all aspherical.

The fifth lens 150 has a positive refractive power and is made of a plastic material. The object side surface 151 is convex at the near optical axis 190, and the image side surface 152 is convex at the near optical axis 190, and the object side surface 151 and the image side are Surface 152 is aspherical.

The sixth lens 160 has a negative refractive power and is made of a plastic material. The object side surface 161 is concave at the near optical axis 190, and the image side surface 162 is concave at the near optical axis 190, and the object side surface 161 and the image side are Surface 162 is aspherical.

The infrared filter element 170 is made of glass and disposed between the sixth lens 160 and the imaging surface 180 without affecting the focal length of the six-piece imaging lens set.

The equation for the above aspheric curve is expressed as follows:

Where z is the position value at the height h of the position along the optical axis 190 with reference to the surface apex; k is the cone constant metric; c is the reciprocal of the radius of curvature; A, B, C, D, E, G, ... It is a high-order aspheric coefficient.

In the six-piece imaging lens group of the first embodiment, the focal length of the six-piece imaging lens group is f, the aperture value (f-number) of the six-piece imaging lens group is Fno, and the angle of the six-piece imaging lens group For 2ω, the values are as follows: f = 4.3690 (mm); Fno = 2.0; and 2ω = 79 (degrees).

In the six-piece imaging lens set of the first embodiment, the focal length of the first lens 110 is f1, the focal length of the second lens 120 is f2, and the following condition is satisfied: f1/f2=-0.5485.

In the six-piece imaging lens set of the first embodiment, the focal length of the second lens 120 is f2, the focal length of the third lens 130 is f3, and the following condition is satisfied: f2/f3 = -0.3065.

In the six-piece imaging lens set of the first embodiment, the focal length of the third lens 130 is f3, the focal length of the fourth lens 140 is f4, and the following condition is satisfied: f3/f4=-1.9723.

In the six-piece imaging lens set of the first embodiment, the focal length of the fourth lens 140 is f4, and the focal length of the fifth lens 150 is f5, and the following condition is satisfied: f4/f5=-4.4327.

In the six-piece imaging lens set of the first embodiment, the focal length of the fifth lens 150 is f5, and the focal length of the sixth lens 160 is f6, and the following condition is satisfied: f5/f6=-1.1126.

In the six-piece imaging lens set of the first embodiment, the combined focal length of the first lens 110 and the second lens 120 is f12, and the combined focal length of the third lens 130 and the fourth lens 140 is f34, and the following conditions are met: F12/f34=-0.2568.

In the six-piece imaging lens set of the first embodiment, the combined focal length of the third lens 130 and the fourth lens 140 is f34, and the combined focal length of the fifth lens 150 and the sixth lens 160 is f56, and the following conditions are met: F34/f56=-1.6294.

In the six-piece imaging lens set of the first embodiment, the combined focal length of the second lens 120 and the third lens 130 is f23, and the focal length of the fourth lens 140 and the fifth lens 150 is f45, and the following conditions are met: f23 /f45=-3.2717.

In the six-piece imaging lens set of the first embodiment, the combined focal length of the first lens 110, the second lens 120, and the third lens 130 is f123, and the overall focal length of the six-piece imaging lens group is f, and the following Condition: f123/f=1.1019.

In the six-piece imaging lens set of the first embodiment, the combined focal length of the fourth lens 140, the fifth lens 150, and the sixth lens 160 is f456, and the overall focal length of the six-piece imaging lens group is f, and the following Condition: f456/f=-4.7365.

In the six-piece imaging lens set of the first embodiment, the combined focal length of the first lens 110 and the second lens 120 is f12, and the combined focal length of the third lens 130, the fourth lens 140, and the fifth lens 150 is f345. And the following conditions are met: f12/f345=2.2310.

In the six-piece imaging lens set of the first embodiment, the combined focal length of the second lens 120, the third lens 130, and the fourth lens 140 is f234, and the combined focal length of the fifth lens 150 and the sixth lens 160 is f56. And the following conditions are met: f234/f56=-0.3270.

In the six-piece imaging lens set of the first embodiment, the overall focal length of the six-piece imaging lens group is f, and the distance from the object-side surface 111 to the imaging surface 180 of the first lens 110 on the optical axis 190 is TL. And the following conditions are met: f / TL = 0.8312.

Refer to Table 1 and Table 2 below for reference.

Table 1 is the detailed structural data of the first embodiment of Fig. 1A, in which the unit of curvature radius, thickness and focal length is mm, and the surfaces 0-17 sequentially represent the surface from the object side to the image side. Table 2 is the aspherical data in the first embodiment, wherein the constant metric of the cone in the aspheric curve equation of k; the high-order aspherical coefficients of A, B, C, D, E, F, and Tables 1 and 2 The surface 3, 4 of the first lens 110 is the object side surface, the image side surface 111, 112, and the surfaces 5, 6 are the object side surface, the image side surface 121, 122, and the surface 7 of the second lens 120, respectively. 8 is the object side surface, the image side surface 131, 132 of the third lens 130, and the surfaces 9, 10 are the object side surface, the image side surface 141, 142 of the fourth lens 140, respectively, and the surfaces 11, 12 are respectively The object side surface, the image side surfaces 151, 152, and the surfaces 13, 14 of the fifth lens 150 are the object side surface, the image side surfaces 161, 162 of the sixth lens 160, respectively.

In addition, the following table of the embodiments corresponds to the schematic diagram of the embodiments and the curvature of field, the distortion of the distortion, and the spherical aberration diagram, and the definitions of the data in the table are the same as those of Tables 1 and 2 of the first embodiment. The same, no further description here.

<Second embodiment>

2A and FIG. 2B, FIG. 2A is a schematic diagram of a six-piece imaging lens set according to a second embodiment of the present invention, and FIG. 2B is an image curvature and distortion of the six-piece imaging lens set of the first embodiment. The difference, and the spherical aberration curve. As can be seen from FIG. 2A, the six-piece imaging lens assembly includes an aperture 200 and an optical group. The optical group includes a first lens 210, a second lens 220, a third lens 230, and a fourth from the object side to the image side. The lens 240, the fifth lens 250, the sixth lens 260, the infrared filter element 270, and the imaging surface 280, wherein the six-piece imaging lens group has six refractive lenses. The aperture 200 is disposed between the image side surface 212 of the first lens 210 and the object.

The first lens 210 has a positive refractive power and is made of a plastic material. The object side surface 211 is convex at the near optical axis 290, and the image side surface 212 is concave at the near optical axis 290, and the object side surface 211 and the image side are Surface 212 is aspherical.

The second lens 220 has a negative refractive power and is made of a plastic material. The object side surface 221 is convex at the near optical axis 290, and the image side surface 222 is concave at the near optical axis 290, and the object side surface 221 and the image side are Surfaces 222 are all aspherical.

The third lens 230 has a positive refractive power and is made of a plastic material. The object side surface 231 is convex at the near optical axis 290, and the image side surface 232 is concave at the near optical axis 290, and the object side surface 231 and the image side are Surfaces 232 are all aspherical.

The fourth lens 240 has a negative refractive power and is made of a plastic material. The object side surface 241 is concave at the near optical axis 290, and the image side surface 242 is concave at the near optical axis 290, and the object side surface 241 and the image side are Surface 242 is aspherical.

The fifth lens 250 has a positive refractive power and is made of a plastic material. The object side surface 251 is convex at the near optical axis 290, and the image side surface 252 is convex at the near optical axis 290, and the object side surface 251 and the image side are Surface 252 is aspherical.

The sixth lens 260 has a negative refractive power and is made of a plastic material. The object side surface 261 is concave at the near optical axis 290, and the image side surface 262 is concave at the near optical axis 290, and the object side surface 261 and the image side are Surface 262 is aspherical.

The infrared filter element 270 is made of glass and disposed between the sixth lens 260 and the imaging surface 280 without affecting the focal length of the six-piece imaging lens set.

Refer to Table 3 and Table 4 below.

In the second embodiment, the aspherical curve equation represents the form as in the first embodiment. In addition, the definitions of the parameters in the following table are the same as those in the first embodiment, and are not described herein.

With Table 3 and Table 4, the following data can be derived:

The six-piece imaging lens set provided by the invention can be made of plastic or glass. When the lens material is plastic, the production cost can be effectively reduced. When the lens is made of glass, the six-piece imaging lens set can be increased. The freedom of force configuration. In addition, the object side surface and the image side surface of the lens in the six-piece imaging lens group may be aspherical, and the aspheric surface can be easily formed into a shape other than the spherical surface, and more control variables are obtained to reduce the aberration and thereby reduce the lens. The number used, therefore, can effectively reduce the overall length of the six-piece imaging lens set of the present invention.

In the six-piece imaging lens set provided by the present invention, in the case of a lens having a refractive power, if the surface of the lens is convex and the position of the convex surface is not defined, it indicates that the surface of the lens is convex at the near-optical axis; When the surface of the lens is concave and the concave position is not defined, it indicates that the surface of the lens is concave at the low beam axis.

The six-piece imaging lens set provided by the invention is more suitable for the optical system of moving focus, and has the characteristics of excellent aberration correction and good imaging quality, and can be applied to 3D (three-dimensional) image capturing and digital in various aspects. In electronic imaging systems such as cameras, mobile devices, digital tablets or car photography.

In the above, the above embodiments and the illustrations are only the preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, that is, the equal variations and modifications made by the scope of the patent application of the present invention are It should be within the scope of the patent of the present invention.

100‧‧‧ aperture

110‧‧‧ first lens

111‧‧‧Side side surface

112‧‧‧ image side surface

120‧‧‧second lens

121‧‧‧Side side surface

122‧‧‧ image side surface

130‧‧‧ third lens

131‧‧‧ object side surface

132‧‧‧Image side surface

140‧‧‧Fourth lens

141‧‧‧ object side surface

142‧‧‧ image side surface

150‧‧‧ fifth lens

151‧‧‧ object side surface

152‧‧‧ image side surface

160‧‧‧ sixth lens

161‧‧‧ object side surface

162‧‧‧ image side surface

170‧‧‧Infrared filter components

180‧‧‧ imaging surface

190‧‧‧ optical axis

Claims (13)

A six-piece imaging lens set comprising: an aperture from the object side to the image side; a first lens having a positive refractive power, the object side surface is a convex surface, and the object side surface and the image side of the first lens At least one surface of the surface is aspherical; a second lens having a negative refractive power, the object side surface is convex, and the object side surface and the image side surface of the second lens have at least one side aspherical; a positive refractive power The third lens has a concave side on the image side surface, and at least one side of the object side surface and the image side surface of the third lens is aspherical; a fourth lens having a negative refractive power, the image side surface is concave, and At least one side of the object side surface and the image side surface of the fourth lens is aspherical; a fifth lens having a positive refractive power, the object side surface is a convex surface, and the object side surface and the image side surface of the fifth lens are at least a sixth lens having a negative refractive power, wherein the object side surface is a concave surface, and the object side surface and the image side surface of the sixth lens have at least one side aspherical surface; wherein the focal length of the second lens For f2, the third lens has a focal length of f3 and is full The following conditions are sufficient: -0.5 < f2 / f3 < -0.1. The six-piece imaging lens set according to claim 1, wherein the first lens has a focal length of f1, the second lens has a focal length of f2, and satisfies the following condition: -0.75 < f1/f2 < -0.35. The six-piece imaging lens set according to claim 1, wherein the focal length of the third lens is f3, the focal length of the fourth lens is f4, and the following condition is satisfied: -3.0 < f3 / f4 < -1.5. The six-piece imaging lens set according to claim 1, wherein the focal length of the fourth lens is f4, the focal length of the fifth lens is f5, and the following condition is satisfied: -5.5 < f4 / f5 < -3.5. The six-piece imaging lens set according to claim 1, wherein the focal length of the fifth lens is f5, the focal length of the sixth lens is f6, and the following condition is satisfied: -1.3 < f5 / f6 < -0.8. The six-piece imaging lens set according to claim 1, wherein the combined focal length of the first lens and the second lens is f12, and the combined focal length of the third lens and the fourth lens is f34, and the following condition is satisfied: -0.5 <f12/f34<-0.1. The six-piece imaging lens set according to claim 1, wherein the combined focal length of the third lens and the fourth lens is f34, and the combined focal length of the fifth lens and the sixth lens is f56, and the following condition is satisfied: -1.9 <f34/f56<-1.3. The six-piece imaging lens set according to claim 1, wherein the combined focal length of the second lens and the third lens is f23, and the focal length of the fourth lens and the fifth lens is f45, and the following condition is satisfied: -4.0< F23/f45 <-2.5. The six-piece imaging lens set according to claim 1, wherein the combined focal length of the first lens, the second lens and the third lens is f123, and the overall focal length of the six-piece imaging lens group is f, and the following conditions are met: :0.7<f123/f<1.4. The six-piece imaging lens set according to claim 1, wherein the combined focal length of the fourth lens, the fifth lens and the sixth lens is f456, and the overall focal length of the six-piece imaging lens group is f, and the following conditions are met: :-9.0<f456/f<-2.5. The six-piece imaging lens set according to claim 1, wherein the combined focal length of the first lens and the second lens is f12, and the combined focal length of the third lens, the fourth lens and the fifth lens is f345, and the following Condition: 1.8 < f12 / f345 < 2.6. The six-piece imaging lens set according to claim 1, wherein the combined focal length of the second lens, the third lens and the fourth lens is f234, and the combined focal length of the fifth lens and the sixth lens is f56, and the following Conditions: -0.55 < f234/f56 <-0.2. The six-piece imaging lens set according to claim 1, wherein the overall focal length of the six-piece imaging lens group is f, and the distance from the object side surface of the first lens to the imaging surface on the optical axis is TL, and satisfies The following conditions are: 0.6 < f / TL < 1.0.