TW201917440A - Wide angle imaging lens assembly - Google Patents

Abstract

A wide angle imaging lens assembly includes a first lens element, an aperture, a second lens element, a third lens element and a fourth lens element from an object side to an image side in order along an optical axis. Refractive powers of the first lens element, the second lens element, the third lens element and the fourth lens element are sequentially negative, positive, positive and negative. An object-side surface of the first lens element has a convex portion in a vicinity of the optical axis, and an image-side surface of the first lens element has a concave portion in a vicinity of the optical axis. An image-side surface of the third lens element has a convex portion in a vicinity of the optical axis. An object-side surface of the fourth lens element has a concave portion in a vicinity of the optical axis, and an image-side surface of the fourth lens element respectively has a concave portion in a vicinity of the optical axis and a convex portion in a vicinity of a periphery. The wide angle imaging lens assembly satisfies 0.25 ≤ |f4/EFL| ≤ 0.5, where f4 is focal length of the fourth lens element, EFL is effective focal length of the wide angle imaging lens assembly, and |f4/EFL| is an absolute value of a ratio between f4 and EFL.

Description

Wide-angle imaging lens set

This invention relates to an optical lens set, and more particularly to a wide angle imaging lens set.

In recent years, in addition to the popularity of portable electronic products, the technology of video module technology has flourished. Some driving recorders, mobile phones or game consoles will also be equipped with video modules to provide camera functions.

Since the current electronic devices are becoming more and more miniaturized, the optical lens group mounted on the image module also needs to meet the requirements of small size or light weight. However, in order to avoid imaging effects and quality degradation, good optical performance must be compromised when reducing system volume and length. At present, the optical lens group with wide-angle function has the disadvantages of large volume and long length. Therefore, how to reduce the volume and length of the system and maintain the optical performance of the optical lens group with wide-angle function has become one of the problems that researchers in this field are eager to solve.

The present invention provides a wide-angle imaging lens set that has a small size, a wide viewing angle, and good optical quality.

Embodiments of the present invention provide a wide-angle imaging lens set that sequentially includes a first lens, an aperture, a second lens, a third lens, and a fourth lens along an optical axis from the object side to the image side. Each of the first to fourth lenses includes an object side that faces the object side and passes the imaging light and an image side that faces the image side and passes the imaging light. The first lens has a negative refracting power. The central portion of the optical axis of the object side surface of the first lens has a convex surface, and the central portion of the optical axis of the image side surface of the first lens has a concave surface. The second lens has a positive power. The third lens has a positive power. The central portion of the optical axis of the image side surface of the third lens has a convex surface. The fourth lens has a negative refracting power. The central portion of the optical axis of the object side of the fourth lens has a concave surface. The central portion of the optical axis of the image side of the fourth lens has a concave surface. The vicinity of the circumference of the image side surface of the fourth lens has a convex surface. The wide-angle imaging lens set satisfies the following conditions: 0.25 ≦|f4/EFL|≦0.5, where f4 is the focal length of the fourth lens, EFL is the effective focal length of the wide-angle imaging lens group, |f4/EFL|the focal length and wide angle of the fourth lens The absolute value of the effective focal length ratio of the imaging lens set.

In an embodiment of the invention, the wide-angle imaging lens set further satisfies the following condition: 0.4≦f3/f≦0.8, where f3 is the focal length of the third lens.

In an embodiment of the invention, the wide-angle imaging lens set further satisfies the following condition: 17≦V4≦30, where V4 is the dispersion coefficient of the fourth lens.

In an embodiment of the invention, the materials of the first to fourth lenses are plastic.

In an embodiment of the invention, the side surfaces of the first to fourth lenses and the image side surfaces are aspherical.

In an embodiment of the invention, the object side surface of the first lens has a convex portion located in the vicinity of the circumference, and the image side surface of the first lens has a concave surface located in the vicinity of the circumference.

In an embodiment of the invention, the object side surface of the second lens has a convex portion located in the vicinity of the optical axis, and the object side surface of the second lens has a convex portion located in the vicinity of the circumference, and the image side of the second lens There is a convex portion located in the vicinity of the optical axis, and the image side surface of the second lens has a convex portion located in the vicinity of the circumference.

In an embodiment of the invention, the object side surface of the fourth lens has a concave portion located in the vicinity of the optical axis and a concave portion located in the vicinity of the circumference, and the image side of the fourth lens has a vicinity of the optical axis. The concave portion of the region and a convex portion located in the vicinity of the circumference.

In an embodiment of the invention, the wide-angle imaging lens set further includes a filter. The filter is located between the fourth lens and the imaging surface of the wide-angle imaging lens group.

Based on the above, the wide-angle imaging lens set of the embodiment of the present invention has the beneficial effects that the wide-angle imaging lens set can be shortened by the combination of the concave-convex shape design and arrangement of the object side or the image side of the lens and the diopter of the lens. With the same volume and length, and the ability to achieve a wide viewing angle, it still retains good optical performance and provides good image quality.

The above described features and advantages of the invention will be apparent from the following description.

In the present specification, "a lens having a positive refractive power (or a negative refractive power)" means that the refractive power of the lens on the optical axis calculated by Gaussian optical theory is positive (or negative). In the wide-angle imaging lens group, each lens is radially symmetrical with each other with the optical axis as the axis of symmetry. Each lens has an object side and an image side opposite the object side. The object side and the image side are defined as the range through which the imaging light passes, wherein the imaging light includes a chief ray and a marginal ray. The object side (or image side) has a region near the optical axis and a region near the circumference that connects and surrounds the region near the optical axis. The area near the optical axis is the area where the imaging light passes through the optical axis. The area near the circumference is the area through which the edge rays pass.

"One surface (object side or image side) of the lens is a convex or concave surface" is judged by the positive or negative of the R value (referring to the radius of curvature of the paraxial axis) of the surface in the vicinity of the optical axis. In the aspect of the object, when the R value is positive, the side surface of the object is convex, that is, the object side has a convex portion in the vicinity of the optical axis. When the R value is negative, the side surface of the object is determined to be concave, that is, the side surface of the object has a concave portion in the vicinity of the optical axis. In the image side, when the R value is positive, it is determined that the image side is concave, that is, the image side has a concave surface in the vicinity of the optical axis; when the R value is negative, it is determined that the image side is convex, that is, the image side is The area near the optical axis has a convex surface.

One surface (object side or image side) of the lens may have more than one convex surface, one or more concave surfaces, or a combination of the two. When the surface has a convex portion and a concave surface, the surface has an inflection point. The inflection point is the transition point between the convex surface and the concave surface. That is to say, the surface is convexly concave at the inflection point, or convexly convex. On the other hand, when the surface has only a convex surface or only a concave surface, the surface does not have an inflection point.

1A is a schematic illustration of a wide-angle imaging lens set in accordance with a first embodiment of the present invention. FIG. 1B is a Transverse Ray Fan Plot of the wide-angle imaging lens set of FIG. 1A. 1C is a Field Curvature aberration of the wide-angle imaging lens group of FIG. 1A in the Sagittal direction and the Tangential direction. FIG. 1D is a distortion aberration on the imaging surface of the wide-angle imaging lens set of FIG. 1A at a wavelength of 550 nm. FIG. 1E is an optical transfer function (MTF) of the wide-angle imaging lens set of FIG. 1A.

Referring to FIG. 1A, the wide-angle imaging lens group 10 of the first embodiment of the present invention sequentially includes a first lens 3, a diaphragm 2, a second lens 4, a third lens 5, and a portion along the optical axis I from the object side to the image side. The four lenses 6 and the filter 9. The object side is the side facing the object to be photographed, and the image side is the side facing the image plane 100. After the light emitted by the object to be photographed enters the wide-angle imaging lens group 10, the first lens 3, the aperture 2, the second lens 4, the third lens 5, the fourth lens 6, and the filter 9 are sequentially passed through, and then The imaging surface 100 forms an image. The filter 9 is, for example, an IR cut filter for preventing infrared rays from being transmitted to the imaging surface 100 in a part of the light band to affect the image quality, but the invention is not limited thereto.

The first lens 3, the second lens 4, the third lens 5, the fourth lens 6, and the filter 9 each include an object side surface 31, 41, 51, 61, 91 and an image side that face the object side and pass imaging light. And image side surfaces 32, 42, 52, 62, 92 through which the imaging light passes.

The first lens 3 has a negative refracting power. The object side surface 31 of the first lens 3 is convex, and has a convex portion 311 located in the vicinity of the optical axis and a convex portion 313 located in the vicinity of the circumference. The image side surface 32 of the first lens 3 is concave and has a concave surface portion 322 located in the vicinity of the optical axis and a concave surface portion 324 located in the vicinity of the circumference.

The aperture 2 is disposed between the first lens 3 and the second lens 4.

The second lens 4 has a positive refracting power. The object side surface 41 of the second lens 4 has a convex portion 411 located in the vicinity of the optical axis and a convex portion located in the vicinity of the circumference. The image side surface 42 of the second lens 4 is convex, and has a convex portion 421 located in the vicinity of the optical axis and a convex portion 423 located in the vicinity of the circumference.

The third lens 5 has a positive refracting power. The object side surface 51 of the third lens 5 has a convex portion 511 located in the vicinity of the optical axis and a concave portion 514 located in the vicinity of the circumference. The image side surface 52 of the third lens 5 has a convex portion 521 located in the vicinity of the optical axis and a convex portion 523 located in the vicinity of the circumference.

The fourth lens 6 has a negative refracting power. The object side surface 61 of the fourth lens 6 has a concave portion 612 located in the vicinity of the optical axis and a concave portion 614 located in the vicinity of the circumference. The image side surface 62 of the fourth lens 6 has a concave portion 622 located in the vicinity of the optical axis and a convex portion 623 located in the vicinity of the circumference.

In order to further reduce the overall weight of the wide-angle imaging lens group 10, the materials of the first lens 1 to the fourth lens 6 are, for example, plastic. In one embodiment, the materials of the first lens 1 to the fourth lens 6 may also be a part of glass and another part of plastic, which can further improve the thermal stability of the overall wide-angle imaging lens group 10. In still another embodiment, the material of the first lens 3 to the fourth lens 6 may be glass.

Other detailed optical data of the first embodiment are shown in Table 1 below. In Table 1, the distance (mm, mm) corresponding to the object side surface 31 of the first lens 3 is 0.300 representing the distance from the object side surface 31 to the next surface (ie, the image side surface 32) of the first lens 3 on the optical axis I. That is, the thickness of the first lens 3 on the optical axis I. Similarly, the distance (mm) corresponding to the image side surface 32 of the first lens 3 is 0.231, and the distance from the image side surface 32 of the first lens 3 to the object side surface 41 of the second lens 4 on the optical axis I is 0.700 mm. Other fields of distance (mm) can be deduced by analogy and will not be repeated below. Table I

In the present embodiment, the object side faces 31, 41, 51, 61 and the image side faces 32, 42, 52, 62 of the first lens 3, the second lens 4, the third lens 5, and the fourth lens 6 have a total of eight faces. It is aspherical, and these aspherical surfaces are defined by formula (1): (1)

In the formula (1), Y is the distance of the point on the aspherical curve from the optical axis I. Z is the depth of the aspherical surface. R is the radius of curvature at the near-optical axis I of the lens surface. K is the cone constant (Conic Constant). Is the i-th order aspheric coefficient.

The aspherical coefficients of the object side surface 31 of the first lens 3 to the image side surface 62 of the fourth lens 6 in the formula (1) are as shown in Table 2. Wherein, the column number 31 in Table 2 indicates that it is the aspherical coefficient of the object side surface 31 of the first lens 3, and other fields can be deduced by analogy. Table II

The relationship between the important parameters in the wide-angle imaging lens group 10 of the first embodiment is as shown in Table 3. The overall system focal length of the wide-angle imaging lens group 10 of the first embodiment is 2.56 mm, the F value (F number / or aperture value) is 2.8, and the total system length (TTL) represents the first lens 3. The distance of the object side 31 along the optical axis I to the imaging plane 100, and the total length of the system of the wide-angle imaging lens group 10 of the first embodiment is 4.47 mm. The field of view (FOV) is 120 degrees.

Referring to FIG. 1B, the horizontal axis is the position where the light passes through the aperture 2, and the vertical axis is the position where the light is projected to the image plane 100. Referring to FIG. 1C, it can be seen that the variation of the focal length in the direction of the sagittal (marked by S) and the direction of the meridian (marked by T) within the entire field of view falls within ±0.04 mm, indicating that the first The wide-angle imaging lens set of one embodiment is capable of effectively eliminating aberrations. Referring to FIG. 1D, the distortion aberration diagram of FIG. 1D shows that the distortion aberration of the first embodiment is maintained within a range of ±50%, indicating that the distortion aberration of the first embodiment has been consistent with the imaging of the optical system. Quality requirements. Referring to FIG. 1E, the horizontal axis is the spatial frequency in Cycles Per Millimeter, and the vertical axis is the modulus of the OTF, and in FIG. 1E is the wavelength. A simulated data plot of light between 470 nm and 650 nm. It can be seen from the above-mentioned graphical results that the displayed figures are all within the standard range, and according to Table 3, the wide-angle imaging lens set 10 of the first embodiment is shortened to 4.47 mm in comparison with the existing optical lens. Under the left and right conditions, still have good optical imaging quality. Further, the wide-angle imaging lens group 10 of the first embodiment can have an angle of view of up to 120 degrees and has a wide viewing angle effect.

2A is a schematic view of a wide-angle imaging lens set of a second embodiment of the present invention. 2B is a transverse ray sector diagram of the wide-angle imaging lens set of FIG. 2A. 2C is a field curvature aberration of the wide-angle imaging lens group of FIG. 2A in the sagittal direction and the meridional direction. 2D is a distortion aberration of the wide-angle imaging lens group of FIG. 2A on the imaging surface at a wavelength of 550 nm. 2E is a graph of optical transfer function of the wide-angle imaging lens set of FIG. 2A.

Referring to FIG. 2A, a second embodiment of the wide-angle imaging lens set 10 of the present invention is substantially similar to the first embodiment, and the difference between the two is as follows, each optical data, the aspherical coefficient, and the lenses 3, The parameters of 4, 5 and 6 are more or less different. Further, in the present embodiment, the object side surface 51 of the third lens 5 is convex, and has a convex portion 511 located in the vicinity of the optical axis and a convex portion 513 in the vicinity of the circumference. It is to be noted that, in order to clearly display the drawings, the same reference numerals of the concave and convex portions as those of the first embodiment are omitted in FIG.

Other detailed optical data of the second embodiment are shown in Table 4 below. The aspherical coefficients of the object side surface 31 of the first lens 3 of the second embodiment to the image side surface 62 of the fourth lens 6 in the formula (1) are as shown in Table 5. Table 4 Table 5

The relationship between the important parameters in the wide-angle imaging lens group 10 of the second embodiment is as shown in Table 6. The overall system focal length of the wide-angle imaging lens group 10 of the second embodiment of Table 6 is 2.09 mm, the F value (F number / or aperture value) is 2.7, and the total system length (TTL) is 3.84 mm. The field of view (FOV) is 120 degrees.

Referring to FIG. 2C, it can be seen that the variation of the focal length in the direction of the sagittal (marked by S) and the direction of the meridian (marked by T) within the entire field of view falls within ±0.04 mm, indicating that the first The wide-angle imaging lens set of the second embodiment is capable of effectively eliminating aberrations. Referring to FIG. 2D, the distortion aberration diagram of FIG. 2D shows that the distortion aberration of the second embodiment is maintained within a range of ±50%, indicating that the distortion aberration of the second embodiment has been consistent with the imaging of the optical system. Quality requirements. It can be seen from the graphical results of FIG. 2A to FIG. 2E that the displayed figures are all within the standard range, and according to Table 6, the wide-angle imaging lens set 10 of the second embodiment is compared with the existing optical lens in the system length. It has a good optical imaging quality with a shortening to about 3.84 mm. Further, the wide-angle imaging lens group 10 of the second embodiment can have an angle of view of up to 120 degrees and has a wide viewing angle effect.

3A is a schematic view of a wide-angle imaging lens set of a third embodiment of the present invention. Figure 3B is a transverse ray sector diagram of the wide-angle imaging lens set of Figure 3A. FIG. 3C is a field curvature aberration of the wide-angle imaging lens group of FIG. 3A in the sagittal direction and the meridional direction. Figure 3D is the distortion aberration of the wide-angle imaging lens set of Figure 3A on the imaging surface at a wavelength of 550 nm. Figure 3E is a graph of the optical transfer function of the wide-angle imaging lens set of Figure 3A.

Referring to FIG. 3A, a third embodiment of the wide-angle imaging lens set 10 of the present invention is substantially similar to the first embodiment, and the difference between the two is as follows, each optical data, the aspherical coefficient, and the lenses 3, The parameters of 4, 5 and 6 are more or less different. Further, in the third embodiment, the object side surface 51 of the third lens 5 is convex, and has a convex portion 511 located in the vicinity of the optical axis and a convex portion 513 in the vicinity of the circumference. It is to be noted here that, in order to clearly display the drawings, the same reference numerals of the concave and convex portions as those of the first embodiment are omitted in FIG.

Other detailed optical data of the third embodiment are shown in Table 7 below. The aspherical coefficients of the object side surface 31 of the first lens 3 of the third embodiment to the image side surface 62 of the fourth lens 6 in the formula (1) are as shown in Table 8. Table 6 Table 7

The relationship between the important parameters in the wide-angle imaging lens group 10 of the third embodiment is as shown in Table 8. Table 8 The wide-angle imaging lens group 10 of the third embodiment has an overall system focal length of 2.09 mm, an F value (F number/or aperture value) of 2.7, and a total system length (TTL) of 4 mm. The field of view (FOV) is 120 degrees.

Referring to FIG. 3C, it can be seen that the amount of change in the focal length in the direction of the sagittal (marked by S) and the direction of the meridian (marked by T) within the entire field of view falls within ±0.04 mm, indicating that the first The wide-angle imaging lens set of the three embodiments can effectively eliminate aberrations. Referring to FIG. 3D, the distortion aberration diagram of FIG. 3D shows that the distortion aberration of the third embodiment is maintained within a range of ±43%, indicating that the distortion aberration of the third embodiment has been consistent with the imaging of the optical system. Quality requirements. It can be seen from the graphical results of FIG. 3A to FIG. 3E that the displayed figures are all within the standard range, and according to Table 8, the wide-angle imaging lens set 10 of the third embodiment is compared with the existing optical lens in the system length. It has a good optical imaging quality with a shortening to about 4 mm. Further, the wide-angle imaging lens group 10 of the third embodiment can have an angle of view of 120 degrees and has a wide viewing angle effect.

In view of the unpredictability of optical system design, under the framework of the present invention, at least one of the following conditional expressions can preferably improve the imaging quality of the system to improve the disadvantages of the prior art.

In the above embodiment, the wide-angle imaging lens group 10 satisfies the following condition: 0.25 ≦ | f4 / EFL | ≦ 0.5. F4 is the focal length of the fourth lens 5. The EFL is an Effective Focal Length (EFL) of the wide-angle imaging lens group 10. |f4/EFL|The absolute value of the focal length of the fourth lens 5 and the effective focal length EFL ratio of the wide-angle imaging lens group 10. Within the above range, the wide-angle imaging lens group 10 of the above embodiment can balance Field Curvature and Chromatic Aberration in the optical system with good optical quality. If |f4/EFL| is higher than the upper limit of 0.5, the system length will be too long, and it will easily cause the field curvature to be insufficient or the chromatic aberration cannot be corrected. If |f4/EFL| is lower than the lower limit of 0.25, it is easy to cause field curvature overcorrection or chromatic aberration overcorrection.

Next, in the above embodiment, the wide-angle imaging lens group 10 satisfies the following condition: 0.4 ≦ f3 / EFL ≦ 0.8. F3 is the focal length of the third lens 5. Within the above range, the wide-angle imaging lens group 10 of the above embodiment can constitute the system main focal length. If f3/EFL is higher than the upper limit of 0.8, the system length will be too long. If the f3/EFL is lower than the lower limit of 0.4, the field curvature is likely to be serious.

Further, in the above embodiment, the wide-angle imaging lens group 10 satisfies the following condition: 17 < V4 ≦ 30. V4 is the dispersion coefficient of the fourth lens 6. Within the above range, the wide-angle imaging lens group 10 of the above embodiment can appropriately correct chromatic aberration. If V4 is higher than the upper limit of 30, the chromatic aberration of the optical system cannot be corrected. If V4 is lower than the lower limit of 17, the chromatic aberration of the optical system is excessively corrected.

In summary, the wide-angle imaging lens set of the embodiment of the present invention can at least achieve the following effects and advantages: the wide-angle can be made by the design and arrangement of the concave-convex shape of the object side or the image side of the lens and the diopter combination of the above lens. The imaging lens set can maintain good optical performance while reducing the volume and length of the system, and can achieve a wide viewing angle effect and provide good imaging quality. Further, when the conditional formula: 0.25 ≦ | f4 / EFL | ≦ 0.5 is satisfied, field curvature and chromatic aberration in the optical system can be effectively balanced. When the conditional formula: 0.4≦f3/EFL≦0.8 is satisfied, the main focal length of the system can be provided, and the length of the system can be made not too long and the phenomenon of curvature of field is less obvious. When the conditional expression: 17 < V4 ≦ 30 is satisfied, the chromatic aberration can be appropriately corrected.

Although the present invention has been disclosed in the above embodiments, it is not intended to limit the present invention, and any one of ordinary skill in the art can make some changes and refinements without departing from the spirit and scope of the present invention. The scope of the invention is defined by the scope of the appended claims.

2‧‧‧ aperture

3‧‧‧first lens

4‧‧‧second lens

5‧‧‧ third lens

6‧‧‧Fourth lens

9‧‧‧Filter

31, 41, 51, 61, 91‧‧‧ ‧ side

32, 42, 52, 62, 92‧‧‧ side

311, 313, 411, 421, 423, 511, 513, 521, 523, 623‧‧ ‧ convex face

322, 324, 514, 612, 614, 622‧‧ ‧ concave face

10‧‧‧ Wide-angle imaging lens set

100‧‧‧ imaging surface

I‧‧‧ optical axis

1A is a schematic illustration of a wide-angle imaging lens set in accordance with a first embodiment of the present invention. Figure 1B is a transverse ray sector diagram of the wide-angle imaging lens set of Figure 1A. 1C is a field curvature aberration of the wide-angle imaging lens group of FIG. 1A in the sagittal direction and the meridional direction. Figure 1D is the distortion aberration of the wide-angle imaging lens set of Figure 1A on the imaging surface at a wavelength of 550 nm. Figure 1E is a graph of the optical transfer function of the wide-angle imaging lens set of Figure 1A. 2A is a schematic illustration of a wide-angle imaging lens set in accordance with a second embodiment of the present invention. 2B is a transverse ray sector diagram of the wide-angle imaging lens set of FIG. 2A. 2C is a field curvature aberration of the wide-angle imaging lens group of FIG. 2A in the sagittal direction and the meridional direction. 2D is a distortion aberration of the wide-angle imaging lens group of FIG. 2A on the imaging surface at a wavelength of 550 nm. 2E is a graph of optical transfer function of the wide-angle imaging lens set of FIG. 2A. 3A is a schematic illustration of a wide-angle imaging lens set in accordance with a third embodiment of the present invention. Figure 3B is a transverse ray sector diagram of the wide-angle imaging lens set of Figure 3A. FIG. 3C is a field curvature aberration of the wide-angle imaging lens group of FIG. 3A in the sagittal direction and the meridional direction. Figure 3D is the distortion aberration of the wide-angle imaging lens set of Figure 3A on the imaging surface at a wavelength of 550 nm. Figure 3E is a graph of the optical transfer function of the wide-angle imaging lens set of Figure 3A.

Claims (10)

A wide-angle imaging lens set includes a first lens, an aperture, a second lens, a third lens and a fourth lens along an optical axis from the object side to the image side, wherein the first lens to the first The four lenses each include an object side facing the object side and passing the imaging light and an image side facing the image side and passing the imaging light; the first lens having a negative refracting power, the optical axis of the object side of the first lens The central area has a convex surface, and the central portion of the optical axis of the image side of the first lens has a concave surface; the second lens has a positive refractive power; the third lens has a positive refractive power, and the third lens a central portion of the optical axis of the side surface has a convex portion; and the fourth lens has a negative refractive power, and a central portion of the optical axis of the object side of the fourth lens has a concave portion, and the image side surface of the fourth lens The central portion of the shaft has a concave portion, and the vicinity of the circumference of the image side of the fourth lens has a convex portion, and the wide-angle imaging lens group satisfies the following condition: 0.25 ≦ | f4 / EFL | ≦ 0.5, Where f4 is the focal length of the fourth lens, EFL is the effective focal length of the wide-angle imaging lens group, and |f4/EFL| is the absolute value of the focal length of the fourth lens and the effective focal length ratio of the wide-angle imaging lens group. The wide-angle imaging lens set according to claim 1, wherein the wide-angle imaging lens set further satisfies the following condition: 0.4≦f3/f≦0.8, wherein f3 is a focal length of the third lens. The wide-angle imaging lens set according to claim 1, wherein the wide-angle imaging lens set further satisfies the following condition: 17≦V4≦30, wherein V4 is a dispersion coefficient of the fourth lens. The wide-angle imaging lens set according to claim 1, wherein the material of the first lens to the fourth lens is plastic. The wide-angle imaging lens set according to claim 1, wherein the side surfaces of the first lens to the fourth lens and the image side surfaces are aspherical. The wide-angle imaging lens set according to claim 1, wherein the object side of the first lens has a convex portion located in a vicinity of the circumference, and the image side of the first lens has a region near the circumference. Concave face. The wide-angle imaging lens set according to claim 1, wherein the object side of the second lens has a convex portion located in a region near the optical axis, and the object side surface of the second lens has a region near the circumference. The convex surface, the image side surface of the second lens has a convex portion located in the vicinity of the optical axis, and the image side surface of the second lens has a convex portion located in the vicinity of the circumference. The wide-angle imaging lens set according to claim 1, wherein the object side of the third lens has a convex portion located in a region near the optical axis, and the image side of the third lens has a light axis. The convex portion of the region and a convex portion located in the vicinity of the circumference. The wide-angle imaging lens set according to claim 1, wherein the object side of the fourth lens has a concave surface located in a region near the optical axis and a concave portion located in the vicinity of the circumference, and the fourth lens The image side has a concave portion located in the vicinity of the optical axis and a convex portion located in the vicinity of the circumference. The wide-angle imaging lens set according to claim 1, further comprising a filter between the fourth lens and an imaging surface of the wide-angle imaging lens group.