TW201812375A - Five-piece optical lens system - Google Patents

Abstract

A five-piece optical lens system includes, in order from the object side to the image side: an aperture stop; a first lens element with a positive refractive power has a convex object-side surface and a concave image-side surface; a second lens element with a negative refractive power has a convex object-side surface and a concave image-side surface; a third lens element with a negative refractive power has a concave image-side surface; a fourth lens element with a positive refractive power has a concave object-side surface and a convex image-side surface; a fifth lens element with a negative refractive power has a concave image-side surface.

Description

Five-piece imaging lens set

The present invention relates to an imaging lens set, and more particularly to a miniaturized five-piece imaging lens set for use in electronic products.

The high-quality small photographic lens is the standard equipment of various mobile devices. With the advancement of semiconductor manufacturing, the pixel area on the electronic photosensitive element is getting smaller and smaller, which makes the camera lens need more detailed analysis. Force, in order to present a more detailed picture quality.

Conventional 3 to 4 small lenses, such as mobile phones, tablets, and other wearable electronic devices, such as US 7,564,635, US 7,920,340, can not display more detailed image quality; Small lenses may have better image quality. However, in large apertures, such as US 8,605,368, US 8,649,113, TW application numbers 102137030, 102121155, they are often accompanied by the sensitivity of manufacturing assembly, making mass production difficult and increasing. The cost of mass production. Or to reduce the assembly tolerance, the surrounding imaging quality must be sacrificed to blur or deform the surrounding image.

Therefore, the continuous development of a high-quality lens with high resolution and low manufacturing assembly tolerance is the motivation for the development of the present invention.

It is an object of the present invention to provide a five-piece imaging lens set, and more particularly to a five-piece imaging lens set having high image count, high resolution, low distortion and low manufacturing tolerance.

In order to achieve the foregoing objective, a five-piece imaging lens set according to the present invention includes, in order from the object side to the image side, an aperture; a first lens having a positive refractive power, the object side surface being near The optical axis is a convex surface, and the image side surface is concave at the near optical axis, and at least one surface of the object side surface and the image side surface is aspherical; a second lens has a negative refractive power, and the object side surface is near the optical axis The convex surface has a concave surface at the near-optical axis of the image side surface, and at least one surface of the object side surface and the image side surface is aspherical; a third lens has a negative refractive power, and the image side surface has a concave surface at a near optical axis. At least one surface of the object side surface and the image side surface is aspherical; a fourth lens has a positive refractive power, and the object side surface is concave at the near optical axis, and the image side surface is convex at the near optical axis, and the object side thereof At least one surface of the surface and the image side surface is aspherical; a fifth lens having a negative refractive power, the image side surface having a concave surface at a near optical axis, and at least one surface of the object side surface and the image side surface being aspherical, At least one surface of the side surface and the image side surface has A little inflection point.

Preferably, wherein the second lens and the third lens have a combined focal length of f23, the fourth lens has a focal length of f4, and satisfies the following condition: -2.7 < f23/f4 < -1.5. Thereby, it is advantageous to improve the large viewing angle and large aperture characteristics of the five-piece imaging lens group, and the sensitivity thereof can be reduced, which is advantageous for the manufacture of each lens and the improvement of the production yield.

Preferably, wherein the focal length of the first lens is f1, the focal length of the second lens is f2, and the following condition is satisfied: -0.7 < f1/f2 < -0.3. Thereby, the refractive power arrangement of the first lens and the second lens is suitable, which is advantageous for obtaining a wide angle of view (angle of view) and reducing excessive increase of system aberration.

Preferably, wherein the focal length of the second lens is f2, the focal length of the fourth lens is f4, and the following condition is satisfied: -3.1 < f2/f4 < -1.8. Thereby, it is advantageous to improve the large viewing angle and large aperture characteristics of the five-piece imaging lens group, and the sensitivity thereof can be reduced, which is advantageous for the manufacture of each lens and the improvement of the production yield.

Preferably, 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: -1.5 < f4/f5 < -0.9. Thereby, the back focus of the five-piece imaging lens group can be effectively shortened, and the miniaturization thereof can be maintained.

Preferably, wherein the focal length of the first lens is f1, the focal length of the third lens is f3, and the following condition is satisfied: -0.15 < f1/f3 < -0.05. Thereby, the balance of the refractive power of the five-piece imaging lens group can be maintained, thereby achieving the best imaging effect.

Preferably, wherein the focal length of the second lens is f2, the focal length of the fifth lens is f5, and the following condition is satisfied: 2.3 < f2 / f5 < 3.7. Thereby, it is possible to shorten the total length of the five-piece imaging lens group and maintain its miniaturization.

Preferably, wherein the focal length of the first lens is f1, the focal length of the fourth lens is f4, and the following condition is satisfied: 0.7 < f1/f4 < 1.6. Thereby, the balance of the refractive power of the five-piece imaging lens group can be maintained, thereby achieving the best imaging effect.

Preferably, wherein the focal length of the first lens is f1, the combined focal length of the second lens and the third lens is f23, and the following condition is satisfied: -0.75 < f1/f23 < -0.35. Thereby, the balance of the refractive power of the five-piece imaging lens group can be maintained, thereby achieving the best imaging effect.

Preferably, wherein the combined focal length of the second lens and the third lens is f23, the combined focal length of the fourth lens and the fifth lens is f45, and the following condition is satisfied: -0.1 < f23/f45 < -0.005. When f23/f45 satisfies the foregoing relationship, the five-image imaging lens group can have a large picture angle, a high number of pictures, and a low lens height, and the resolution capability is remarkably improved. Conversely, if the optical data value is exceeded. The range will result in problems with the performance, low resolution, and insufficient yield of the five-piece imaging lens set.

Preferably, wherein the combined focal length of the first lens and the second lens is f12, the combined focal length of the third lens and the fourth lens is f34, and the following condition is satisfied: 1.0 < f12/f34 < 2.4. When f12/f34 satisfies the foregoing relationship, the five-image imaging lens group can have a large picture angle, a high number of pictures, and a low lens height, and the image resolution capability is significantly improved. Conversely, if the optical data value is exceeded. The range will result in problems with the performance, low resolution, and insufficient yield of the five-piece imaging lens set.

Preferably, wherein the combined focal length of the third lens and the fourth lens is f34, the focal length of the fifth lens is f5, and the following condition is satisfied: -1.6 < f34/f5 < -0.9. When f34/f5 satisfies the foregoing relationship, the five-piece imaging lens group can have a large picture angle, a high number of pictures, and a low lens height, and the resolution capability is significantly improved. Conversely, if the optical data value is exceeded. The range will result in problems with the performance, low resolution, and insufficient yield of the five-piece imaging lens set.

Preferably, wherein the focal length of the first lens is f1, the combined focal length of the second lens, the third lens and the fourth lens is f234, and the following condition is satisfied: 0.5 < f1/f234 < 1.5. By proper configuration of the refractive power, it helps to reduce the occurrence of spherical aberration and astigmatism.

Preferably, wherein the second lens, the third lens and the fourth lens have a combined focal length of f234, the fifth lens has a focal length of f5, and satisfies the following condition: -2.0 < f234/f5 < -1.1. By proper configuration of the refractive power, it helps to reduce the occurrence of spherical aberration and astigmatism.

Preferably, wherein the first lens, the second lens and the third lens have a combined focal length of f123, the fourth lens has a focal length of f4, and satisfies the following condition: 1.3 < f123/f4 < 2.6. By proper configuration of the refractive power, it helps to reduce the occurrence of spherical aberration and astigmatism.

Preferably, wherein the first lens, the second lens and the third lens have a combined focal length of f123, the fourth lens and the fifth lens have a combined focal length of f45, and satisfy the following condition: 0.005 < f123/f45 < 0.1. By proper configuration of the refractive power, it helps to reduce the occurrence of spherical aberration and astigmatism.

Preferably, wherein the first lens has a dispersion coefficient of V1, the second lens has a dispersion coefficient of V2, and satisfies the following condition: 30 < V1 - V2 < 42. Thereby, the chromatic aberration of the five-piece imaging lens group can be corrected.

Preferably, wherein the fourth lens has a dispersion coefficient of V4, the third lens has a dispersion coefficient of V3, and satisfies the following condition: 30 < V4-V3<42. Thereby, the chromatic aberration of the five-piece imaging lens group can be corrected.

Preferably, wherein the overall focal length of the five-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 < 0.95 . Thereby, it is advantageous to obtain a wide picture angle (angle of view) and to facilitate the miniaturization of the five-piece imaging lens group to be mounted on a thin electronic product.

With regard to the techniques, means, and other effects of the present invention in order to achieve the above objects, three preferred embodiments are described in detail with reference to the drawings.

<First Embodiment>

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

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 negative 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 positive 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 convex 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 negative refractive power and is made of a plastic material. The object side surface 151 is concave 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 The surface 152 is aspherical, and at least one surface of the object side surface 151 and the image side surface 152 has at least one inflection point.

The infrared filter element 170 is made of glass and disposed between the fifth lens 150 and the imaging surface 180 without affecting the focal length of the five-piece imaging lens set.

The aspherical curve equations of the above lenses are expressed as follows:

Where z is the position value with reference to the surface apex at a position of height h in the direction of the optical axis 190; c is the curvature of the lens surface near the optical axis 190, and is the reciprocal of the radius of curvature (R) (c = 1/R) R is the radius of curvature of the lens surface near the optical axis 190, h is the vertical distance of the lens surface from the optical axis 190, k is a conic constant, and A, B, C, D, E, G, ... are High order aspheric coefficient.

In the five-piece imaging lens group of the first embodiment, the focal length of the five-piece imaging lens group is f, the aperture value (f-number) of the five-piece imaging lens group is Fno, and the maximum magnification of the five-piece imaging lens group. The field angle is FOV and its values are as follows: f = 3.38 (mm); Fno = 2.2; and FOV = 84 (degrees).

In the five-piece imaging lens group 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 = -0.45.

In the five-piece imaging lens group of the first embodiment, the focal length of the second lens 120 is f2, the focal length of the fourth lens 140 is f4, and the following condition is satisfied: f2/f4 = -2.30.

In the five-piece imaging lens group 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 = -1.19.

In the five-piece imaging lens group of the first embodiment, the focal length of the first lens 110 is f1, the focal length of the third lens 130 is f3, and the following condition is satisfied: f1/f3 = -0.10.

In the five-piece imaging lens group of the first embodiment, the focal length of the second lens 120 is f2, and the focal length of the fifth lens 150 is f5, and the following condition is satisfied: f2/f5 = 2.73.

In the five-piece imaging lens group of the first embodiment, the focal length of the first lens 110 is f1, the focal length of the fourth lens 140 is f4, and the following condition is satisfied: f1/f4 = 1.03.

In the five-piece imaging lens set of the first embodiment, the focal length of the first lens 110 is f1, the combined focal length of the second lens 120 and the third lens 130 is f23, and the following conditions are satisfied: f1/f23 = -0.56 .

In the five-piece imaging lens set of the first embodiment, the composite focal length of the second lens 120 and the third lens 130 is f23, and the focal length of the fourth lens 140 is f4, and the following conditions are satisfied: f23/f4 = -1.84 .

In the five-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 combined focal length of the fourth lens 140 and the fifth lens 150 is f45, and the following conditions are satisfied: F23/f45 = -0.06.

In the five-piece imaging lens set of the first embodiment, the composite 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 = 1.47.

In the five-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 focal length of the fifth lens 150 is f5, and the following conditions are satisfied: f34/f5 = -1.27 .

In the five-piece imaging lens set of the first embodiment, the focal length of the first lens is f1, and the combined focal length of the second lens 120, the third lens 130, and the fourth lens 140 is f234, and the following conditions are satisfied: f1/ F234 = 0.74.

In the five-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 focal length of the fifth lens 150 is f5, and the following conditions are satisfied: f234 /f5 = -1.64.

In the five-piece imaging lens set of the first embodiment, the composite focal length of the first lens 110, the second lens 120, and the third lens 130 is f123, and the focal length of the fourth lens 140 is f4, and the following conditions are met: f123 /f4 = 1.76.

In the five-piece imaging lens set of the first embodiment, the composite focal length of the first lens 110, the second lens 120, and the third lens 130 is f123, and the combined focal length of the fourth lens 140 and the fifth lens 150 is f45. The following conditions are met: f123/f45 = 0.06.

In the five-piece imaging lens set of the first embodiment, the first lens 110 has a dispersion coefficient of V1, and the second lens 120 has a dispersion coefficient of V2 and satisfies the following conditions: V1-V2 = 34.5.

In the five-piece imaging lens group of the first embodiment, the fourth lens 140 has a dispersion coefficient of V4, and the third lens 130 has a dispersion coefficient of V3 and satisfies the following conditions: V4-V3 = 34.5.

In the five-piece imaging lens group of the first embodiment, the overall focal length of the five-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. The following conditions are met: f/TL = 0.86.

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 0-15 sequentially represent the surface from the object side to the image side. Table 2 is the aspherical data in the first embodiment, wherein the cone coefficients in the a-spherical curve equation of k, A, B, C, D, E, F, ... are high-order aspheric coefficients. In addition, the following table of the embodiments corresponds to the schematic diagram and the field curvature diagram of each embodiment, and the definition of the data in the table is the same as the definitions of Table 1 and Table 2 of the first embodiment, and details are not described herein.

<Second embodiment>

2A and 2B, wherein FIG. 2A is a schematic diagram of a five-piece imaging lens set according to a second embodiment of the present invention, and FIG. 2B is a five-piece imaging lens set of the second embodiment from left to right. Image curvature and distortion curve. As can be seen from FIG. 2A, the five-piece imaging lens assembly includes an aperture 200 and an optical group including the first lens 210, the second lens 220, the third lens 230, and the fourth from the object side to the image side. The lens 240, the fifth lens 250, the infrared filter element 270, and the imaging surface 280, wherein the five-piece imaging lens group has five lenses with refractive power. 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 negative refractive power and is made of a plastic material. The object side surface 231 is concave 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 positive 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 convex 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 negative 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 concave at the near optical axis 290, and the object side surface 251 and the image side are The surface 252 is aspherical, and at least one surface of the object side surface 251 and the image side surface 252 has at least one inflection point.

The infrared filter element 270 is made of glass and disposed between the fifth lens 250 and the imaging surface 280 without affecting the focal length of the five-piece imaging lens group.

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:

<Third embodiment>

Please refer to FIG. 3A and FIG. 3B , wherein FIG. 3A is a schematic diagram of a five-piece imaging lens set according to a third embodiment of the present invention, and FIG. 3B is a five-piece imaging lens set of the third embodiment from left to right. Image curvature and distortion curve. As can be seen from FIG. 3A, the five-piece imaging lens assembly includes an aperture 300 and an optical group including the first lens 310, the second lens 320, the third lens 330, and the fourth from the object side to the image side. The lens 340, the fifth lens 350, the infrared filter element 370, and the imaging surface 380, wherein the five-piece imaging lens group has five refractive lenses. The aperture 300 is disposed between the image side surface 312 of the first lens 310 and the subject.

The first lens 310 has a positive refractive power and is made of a plastic material. The object side surface 311 is convex at the near optical axis 390, and the image side surface 312 is concave at the near optical axis 390, and the object side surface 311 and the image side are Surfaces 312 are all aspherical.

The second lens 320 has a negative refractive power and is made of a plastic material. The object side surface 321 is convex at the near optical axis 390, and the image side surface 322 is concave at the near optical axis 390, and the object side surface 321 and the image side are Surfaces 322 are all aspherical.

The third lens 330 has a negative refractive power and is made of a plastic material. The object side surface 331 is concave at the near optical axis 390, and the image side surface 332 is concave at the near optical axis 390, and the object side surface 331 and the image side are Surface 332 is aspherical.

The fourth lens 340 has a positive refractive power and is made of a plastic material. The object side surface 341 is concave at the near optical axis 390, and the image side surface 342 is convex at the near optical axis 390, and the object side surface 341 and the image side are Surfaces 342 are all aspherical.

The fifth lens 350 has a negative refractive power and is made of a plastic material. The object side surface 351 is concave at the near optical axis 390, and the image side surface 352 is concave at the near optical axis 390, and the object side surface 351 and the image side are The surface 352 is aspherical, and the object side surface 351 and the image side surface 352 have at least one inversion point.

The infrared filter element 370 is made of glass and disposed between the fifth lens 350 and the imaging surface 380 without affecting the focal length of the five-piece imaging lens group.

Refer to Table 5 and Table 6 below for reference.

In the third 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 5 and Table 6, the following data can be derived:

The five-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 five-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 five-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 five-piece imaging lens set of the present invention.

In the five-piece imaging lens set provided by the present invention, if the lens surface is convex and the convex surface is not defined, the lens surface is convex at the near optical axis; When the lens surface is concave and the concave position is not defined, it indicates that the lens surface is concave at the near optical axis.

The five-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 many aspects. In electronic imaging systems such as cameras, mobile devices, digital tablets or car photography.

In the above, the above embodiments and drawings are only the preferred embodiments of the present invention, and the scope of the present invention is not limited thereto, that is, the equivalent changes and modifications made by the scope of the present invention are all It should be within the scope of the patent of the present invention.

100, 200, 300‧ ‧ aperture

110, 210, 310‧‧‧ first lens

111, 211, 311‧‧‧ ‧ side surface

112, 212, 312‧‧‧ side surface

120, 220, 320‧‧‧ second lens

121, 221, 321‧‧‧ ‧ side surface

122, 222, 322‧‧‧ image side surface

130, 230, 330‧‧‧ third lens

131, 231, 331‧‧‧ ‧ side surface

132, 232, 332‧‧‧ image side surface

140, 240, 340‧ ‧ fourth lens

141, 241, 341‧‧‧ ‧ side surface

142, 242, 342‧‧‧ image side surface

150, 250, 350‧‧‧ fifth lens

151, 251, 351‧‧‧ ‧ side surface

152, 252, 352‧‧‧ side surface

170, 270, 370‧‧‧ Infrared filtering filter elements

180, 280, 380‧‧ ‧ imaging surface

190, 290, 390‧‧‧ optical axis

f‧‧‧Focus of the five-piece imaging lens set

Aperture value of Fno‧‧‧ five-piece imaging lens set

Maximum field of view in the FOV‧‧‧ five-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‧‧‧The focal length of the fourth lens

f5‧‧‧Focus of the fifth lens

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

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

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

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

F123‧‧‧Combined focal length of the first lens, the second lens and the third lens

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

V1‧‧‧Dispersion coefficient of the first lens

V2‧‧‧Dispersion coefficient of the second lens

V3‧‧‧Dispersion coefficient of the third lens

V4‧‧‧Dispersion coefficient of the fourth lens

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

Figure 1A is a schematic illustration of a five-piece imaging lens set in accordance with a first embodiment of the present invention. Fig. 1B is a graph showing the curvature of field and the distortion of the five-piece imaging lens group of the first embodiment from left to right. 2A is a schematic view of a five-piece imaging lens set of a second embodiment of the present invention. 2B is a graph showing the curvature of field and the distortion of the five-piece imaging lens group of the second embodiment from left to right. Figure 3A is a schematic illustration of a five-piece imaging lens set in accordance with a third embodiment of the present invention. Fig. 3B is a graph showing the curvature of field and the distortion of the five-piece imaging lens group of the third embodiment, from left to right.

Claims (19)

A five-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 being convex at a near optical axis, and the image side surface being at a near optical axis a concave surface, at least one surface of the object side surface and the image side surface is aspherical; a second lens having a negative refractive power, the object side surface being convex at the near optical axis, and the image side surface being concave at the near optical axis, At least one surface of the object side surface and the image side surface is aspherical; a third lens having a negative refractive power, the image side surface having a concave surface at a near optical axis, and at least one surface of the object side surface and the image side surface being aspherical a fourth lens having a positive refractive power, wherein the object side surface is concave at a near optical axis, and the image side surface is convex at a near optical axis, and at least one surface of the object side surface and the image side surface is aspherical; The fifth lens has a negative refractive power, and the image side surface has a concave surface at a near optical axis, and at least one surface of the object side surface and the image side surface is aspherical, and at least one surface of the object side surface and the image side surface has at least one recursion point. The five-piece imaging lens set according to claim 1, wherein the second lens and the third lens have a combined focal length of f23, the fourth lens has a focal length of f4, and satisfies the following condition: -2.7 < f23/f4 < -1.5. The five-piece imaging lens set according to claim 1, wherein the focal length of the first lens is f1, the focal length of the second lens is f2, and the following condition is satisfied: -0.7 < f1/f2 < -0.3. The five-piece imaging lens set according to claim 1, wherein the second lens has a focal length of f2, the fourth lens has a focal length of f4, and satisfies the following condition: -3.1 < f2/f4 < -1.8. The five-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: -1.5 < f4/f5 < -0.9. The five-piece imaging lens set according to claim 1, wherein the focal length of the first lens is f1, the focal length of the third lens is f3, and the following condition is satisfied: -0.15 < f1/f3 < -0.05. The five-piece imaging lens set according to claim 1, wherein the second lens has a focal length of f2, the fifth lens has a focal length of f5, and satisfies the following condition: 2.3 < f2/f5 < 3.7. The five-piece imaging lens set according to claim 1, wherein the focal length of the first lens is f1, the focal length of the fourth lens is f4, and the following condition is satisfied: 0.7 < f1/f4 < 1.6. The five-piece imaging lens set according to claim 1, wherein the focal length of the first lens is f1, the combined focal length of the second lens and the third lens is f23, and the following condition is satisfied: -0.75 < f1/f23 < -0.35. The five-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 combined focal length of the fourth lens and the fifth lens is f45, and the following condition is satisfied: -0.1 < f23/f45 < -0.005. The five-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: 1.0 < F12/f34 < 2.4. The five-piece imaging lens set according to claim 1, wherein the combined focal length of the third lens and the fourth lens is f34, the focal length of the fifth lens is f5, and the following condition is satisfied: -1.6 < f34/f5 < -0.9. The five-piece imaging lens set according to claim 1, wherein the focal length of the first lens is f1, the combined focal length of the second lens, the third lens and the fourth lens is f234, and the following condition is satisfied: 0.5 < f1 /f234 < 1.5. The five-piece imaging lens set according to claim 1, wherein the second lens, the third lens and the fourth lens have a combined focal length of f234, the fifth lens has a focal length of f5, and satisfies the following condition: -2.0 < F234/f5 < -1.1. The five-piece imaging lens set according to claim 1, wherein the first lens, the second lens and the third lens have a combined focal length of f123, the fourth lens has a focal length of f4, and satisfies the following condition: 1.3 < f123 /f4 < 2.6. The five-piece imaging lens set according to claim 1, wherein the first lens, the second lens and the third lens have a combined focal length of f123, and the fourth lens and the fifth lens have a combined focal length of f45, and satisfy the following Condition: 0.005 < f123/f45 < 0.1. The five-piece imaging lens set according to claim 1, wherein the first lens has a dispersion coefficient of V1, the second lens has a dispersion coefficient of V2, and satisfies the following condition: 30 < V1 - V2 < 42. The five-piece imaging lens set according to claim 1, wherein the fourth lens has a dispersion coefficient of V4, the third lens has a dispersion coefficient of V3, and satisfies the following condition: 30 < V4-V3<42. The five-piece imaging lens set according to claim 1, wherein the overall focal length of the five-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 < 0.95.