CN109375351B - A camera lens group and electronic equipment - Google Patents

Abstract

The present invention discloses a camera lens group, which is a seven-lens structure. The first lens and the seventh lens both have negative refractive power, the second lens and the sixth lens both have positive refractive power, the object side surface of the first lens is convex at the near optical axis, the image side surface of the fourth lens is concave at the near optical axis, the object side surface of the fifth lens is concave at the near optical axis, and the image side surface of the seventh lens is concave at the near optical axis. By reasonably limiting the ratio of the spacing distance between the first lens and the second lens on the optical axis to the spacing distance between the fifth lens and the sixth lens on the optical axis, the spatial configuration of each lens can be balanced to improve the degree of coordination between the object side end lenses, and to allow the image side end lenses to have sufficient spacing to reconcile aberrations. The camera lens group can have the characteristics of large aperture, high pixel, high resolution, excellent field of view angle, etc., can provide good imaging quality, and meet application requirements. The present invention also discloses an electronic device.

Description

A camera lens group and electronic equipment

technical field

The present invention relates to the technical field of optical imaging devices, in particular to an imaging lens group. The invention also relates to an electronic device.

Background technique

With the rapid upgrading of related consumer electronic products such as smart phones, portable computers and tablet devices, the market has higher and higher requirements for the quality of optical imaging lenses for electronic products. With the advancement of semiconductor manufacturing process technology, the pixel size of the photosensitive device has been reduced. Accordingly, the imaging lens group is gradually developing into the high-pixel field, so the requirements for its imaging quality are also increasing.

Traditionally, lenses mounted on portable products mostly use three-piece or four-piece lens structures. However, as the market's requirements for lenses in terms of pixels and image quality continue to rise, the existing optical camera lenses can no longer meet the requirements of higher-end photography. system. With the development of technology and the increase of diversified demands of users, in order to obtain better imaging quality, five-piece, six-piece, and seven-piece lens structures are gradually appearing in the design of camera lens groups. On the other hand, in order to make the imaging surface of the imaging lens group have sufficient illuminance, the large aperture characteristic is one of the indispensable elements at present. Therefore, an imaging lens group with a large aperture and excellent optical characteristics is urgently needed.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide an imaging lens group, which has the characteristics of large aperture, high pixel, high resolution, excellent field of view, etc., which can provide good imaging quality and meet application requirements. The present invention also provides an electronic device.

To achieve the above object, the present invention provides the following technical solutions:

An imaging lens group, comprising a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens in sequence from the object side to the image side, and each lens has a direction toward the object side. The object side and the image side facing the image side, where:

Both the first lens and the seventh lens have negative refractive power, the second lens and the sixth lens both have positive refractive power, and the object side of the first lens is convex at the near optical axis, so The image side of the fourth lens is concave at the near optical axis, the object side of the fifth lens is concave at the near optical axis, and the seventh lens image side is concave at the near optical axis;

and satisfy the following conditions:

0.2<T ₁₂ /T ₅₆ <2;

Wherein, T ₁₂ represents the distance on the optical axis from the image side of the first lens to the object side of the second lens, and T ₅₆ represents the distance on the optical axis from the image side of the fifth lens to the object side of the sixth lens on the optical axis distance.

Preferably, the following conditional formula is also satisfied: 0<YC ₄₂ /YC ₇₂ <0.9, wherein Yc ₄₂ represents the vertical distance from the inflection point of the image side surface of the fourth lens to the optical axis, and Yc ₇₂ represents the image of the seventh lens The vertical distance from the inflection point of the side to the optical axis.

Preferably, the following conditional formula is also satisfied: f/EPD≤1.80, where f represents the focal length of the imaging lens group, and EPD represents the entrance pupil diameter of the imaging lens group.

Preferably, the following conditional formula is also satisfied: 0.5<CT ₄ /CT ₆ <2.5, wherein CT ₄ represents the thickness of the fourth lens on the optical axis, and CT ₆ represents the thickness of the sixth lens on the optical axis.

Preferably, the following conditional formula is also satisfied: -10<f ₁ /f<-1, where f ₁ represents the focal length of the first lens, and f represents the focal length of the imaging lens group.

Preferably, the following conditional formula is also satisfied: 0<f/R ₇₂ <5, where f represents the focal length of the imaging lens group, and R ₇₂ represents the curvature radius of the image side surface of the seventh lens.

Preferably, the following conditional formula is also satisfied: -2<R ₃₂ /R ₃₁ <1, where R ₃₂ represents the curvature radius of the image side surface of the third lens, and R ₃₁ represents the curvature radius of the third lens object side surface.

Preferably, the following conditional formula is also satisfied: -2<(R ₆₁ +R ₆₂ )/(R ₆₁ -R ₆₂ )≤2, wherein R ₆₁ represents the radius of curvature of the object side surface of the sixth lens, and R ₆₂ represents the The curvature radius of the image side surface of the sixth lens.

Preferably, the following conditional formula is also satisfied: 0.1<T ₂₃ /(CT ₂ +CT ₃ )≤0.5, where T ₂₃ represents the distance from the image side of the second lens to the object side of the third lens on the optical axis, CT ₂ represents the thickness of the second lens on the optical axis, and CT ₃ represents the thickness of the third lens on the optical axis.

An electronic device includes an imaging device, the imaging device includes an electronic photosensitive element and the above-mentioned imaging lens group, and the electronic photosensitive element is arranged on an imaging surface of the imaging lens group.

It can be known from the above technical solutions that the imaging lens group provided by the present invention includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, and a third lens arranged in sequence from the object side to the image side along the optical axis. In the six lenses and the seventh lens, the light from the object side passes through each lens in turn and is imaged onto the imaging surface located on the image side of the seventh lens. The camera lens group is a seven-piece lens structure, wherein by reasonably defining the ratio of the separation distance between the first lens and the second lens on the optical axis to the separation distance between the fifth lens and the sixth lens on the optical axis, the camera can be balanced. The spatial configuration of the lens group improves the degree of cooperation between the lenses on the object side and provides sufficient distance between the lenses on the image side to reconcile aberrations. The imaging lens group provided by the present invention has the characteristics of large aperture, high pixel, high resolution, excellent field of view and the like, can provide good imaging quality and meet application requirements.

An electronic device provided by the present invention can achieve the above beneficial effects.

Description of drawings

In order to explain the embodiments of the present invention or the technical solutions in the prior art more clearly, the following briefly introduces the accompanying drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only These are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can also be obtained according to these drawings without creative efforts.

1 is a schematic diagram of an imaging lens group provided in Embodiment 1 of the present invention;

2 is a distortion field curve diagram of the imaging lens group in Embodiment 1 of the present invention;

3 is a spherical aberration curve diagram of the imaging lens group in Embodiment 1 of the present invention;

4 is a schematic diagram of an imaging lens group provided in Embodiment 2 of the present invention;

5 is a distortion field curve diagram of the imaging lens group in Embodiment 2 of the present invention;

6 is a spherical aberration curve diagram of the imaging lens group in Embodiment 2 of the present invention;

7 is a schematic diagram of an imaging lens group provided in Embodiment 3 of the present invention;

8 is a distortion field curve diagram of the imaging lens group in Embodiment 3 of the present invention;

9 is a spherical aberration curve diagram of an imaging lens group in Embodiment 3 of the present invention;

10 is a schematic diagram of an imaging lens group provided in Embodiment 4 of the present invention;

11 is a distortion field curve diagram of the imaging lens group in Embodiment 4 of the present invention;

12 is a spherical aberration curve diagram of the imaging lens group in Embodiment 4 of the present invention;

13 is a schematic diagram of an imaging lens group provided in Embodiment 5 of the present invention;

14 is a distortion field curve diagram of the imaging lens group in Embodiment 5 of the present invention;

15 is a spherical aberration curve diagram of the imaging lens group in Embodiment 5 of the present invention;

16 is a schematic diagram of an imaging lens group according to Embodiment 6 of the present invention;

17 is a distortion field curve diagram of the imaging lens group in Embodiment 6 of the present invention;

18 is a spherical aberration curve diagram of the imaging lens group in Embodiment 6 of the present invention;

19 is a schematic diagram of an imaging lens group provided in Embodiment 7 of the present invention;

20 is a distortion field curve diagram of the imaging lens group in Embodiment 7 of the present invention;

21 is a spherical aberration curve diagram of an imaging lens group in Embodiment 7 of the present invention;

22 is a schematic diagram of an imaging lens group according to Embodiment 8 of the present invention;

23 is a distortion field curve diagram of the imaging lens group in Embodiment 8 of the present invention;

24 is a spherical aberration curve diagram of the imaging lens group in Embodiment 8 of the present invention;

25 is a schematic diagram of Yc ₄₂ in the imaging lens group according to Embodiment 1 of the present invention;

FIG. 26 is a schematic diagram of Yc ₇₂ in the imaging lens group according to Embodiment 1 of the present invention.

Detailed ways

In order to make those skilled in the art better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described The embodiments are only some of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

The invention provides an imaging lens group, which includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens in sequence from the object side to the image side along the optical axis, each A lens has an object side facing the object side and an image side facing the image side, and further includes an imaging surface located on the image side of the seventh lens, and an infrared imaging surface disposed between the seventh lens and the imaging surface Filter, the infrared filter does not affect the focal length of the camera lens group.

The first lens has negative refractive power, which can be crescent-shaped when viewed from the side, and its object side is convex.

The second lens has a positive refractive power, and its refractive power is stronger than that of the first lens, which can effectively suppress the back focal length of the imaging lens group and avoid excessively long back focal length of the lens group due to the negative refractive power of the first lens. At the same time, the object side surface of the second lens can be convex, so that the aberration and distortion of the imaging lens group can be eliminated.

The fourth lens can have a positive refractive power, and can cooperate with the positive refractive power of the second lens, so as to facilitate the sensitivity of the imaging lens group and further improve the manufacturing yield. The object side surface of the fourth lens may be a convex surface near the optical axis, which can correct spherical aberration and effectively improve the imaging quality. In addition, the image side surface of the fourth lens may be concave at the near optical axis, and the image side surface of the fourth lens includes at least one inflection point, which is beneficial to correct off-axis aberrations.

The fifth lens has refractive power, its object side can be concave at the near optical axis, and its image side can be convex at the near optical axis, which is beneficial to correct the astigmatism of the camera lens group and improve its resolution to obtain good imaging. quality.

The sixth lens has a positive refractive power, which helps to strengthen the converging ability of the image side end of the imaging lens group, so as to facilitate the expansion of the viewing angle, and is suitable for various electronic devices. Preferably, the image side surface of the sixth lens may be a convex surface at the near optical axis, which can effectively share the converging ability of the third lens, and avoid excessive curvature of the surface of a single lens and reduce manufacturability.

The seventh lens has a negative refractive power, and its object side and image side can be concave, which helps to keep the principal point of the imaging lens group effectively away from the imaging surface, so as to strengthen the shortening of its back focal length, thereby reducing the length of the imaging lens group. The total length can achieve the purpose of miniaturization; in addition, the image side of the seventh lens changes from concave to convex from the near optical axis to the edge. The angle on the measuring element is preferably corrected for off-axis field of view aberrations.

By reasonably controlling the positive and negative distribution of the refractive power of each lens in the lens group, the low-order aberrations of the lens group can be effectively balanced and controlled, the tolerance sensitivity of the system can be reduced, and the miniaturization of the imaging lens group can be ensured. There may be a space between any two adjacent lenses of the imaging lens group, which facilitates the assembly of the lenses and improves the manufacturing yield.

In addition, the imaging lens group satisfies the condition 0.2<T ₁₂ /T ₅₆ <2, where T ₁₂ represents the distance on the optical axis from the image side of the first lens to the object side of the second lens, and T ₅₆ represents the fifth The distance on the optical axis from the image side of the lens to the object side of the sixth lens is determined by reasonably defining the distance between the first lens and the second lens on the optical axis and the distance between the fifth lens and the sixth lens on the optical axis. The ratio of the separation distance can balance the spatial configuration of the imaging lens group, so as to improve the degree of cooperation between the lenses at the object side, and to provide sufficient distance between the lenses at the image side to reconcile aberrations. The imaging lens group of the present invention can have the characteristics of large aperture, high pixel, high resolution, large field of view, etc., can provide good imaging quality, and meet application requirements.

Preferably, the imaging lens group also satisfies the following conditional formula: 0<YC ₄₂ /YC ₇₂ <0.9, wherein Yc ₄₂ represents the vertical distance from the inflection point on the image side of the fourth lens to the optical axis, and Yc ₇₂ represents the The vertical distance from the inflection point on the image side of the seventh lens to the optical axis. By optimizing the surface shapes of the fourth lens and the seventh lens, the light height of the imaging lens group can be effectively improved, meeting the high pixel requirements of the imaging system, and the light deflection can be eased, which can effectively reduce the sensitivity of the imaging lens group. , and can effectively correct the coma, distortion and chromatic aberration of the camera lens group.

Preferably, the imaging lens group also satisfies the following conditional formula: f/EPD≤1.80, where f represents the focal length of the imaging lens group, and EPD represents the entrance pupil diameter of the imaging lens group. In this way, the aperture size of the imaging lens group can be appropriately configured, so that the imaging lens group with a large aperture can still use a higher shutter speed to capture clear images when the light is insufficient. Preferably, it satisfies the following conditions: f/EPD≤1.50.

Preferably, the imaging lens group also satisfies the following conditional formula: 0.5<CT ₄ /CT ₆ <2.5, where CT ₄ represents the thickness of the fourth lens on the optical axis, and CT ₆ represents the thickness of the sixth lens on the optical axis on the thickness. Satisfying this condition helps to avoid stray light from affecting imaging due to the configuration of the fourth lens with a relatively curved shape, and helps to reduce noise and improve imaging quality. In addition, it can ensure that the fourth lens has sufficient thickness to control the direction of the optical path of the imaging lens group, so as to have good imaging quality.

Preferably, the imaging lens group also satisfies the following conditional formula: -10<f ₁ /f<-1, where f ₁ represents the focal length of the first lens, and f represents the focal length of the imaging lens group. By reasonably controlling the negative refractive power of the first lens, the negative third-order spherical aberration and the positive fifth-order spherical aberration contributed by the first lens are reasonably controlled, so that the negative third-order spherical aberration and the positive fifth-order spherical aberration contributed by the first lens are The spherical aberration can cancel out the positive third-order spherical aberration and the negative fifth-order spherical aberration generated by the subsequent positive lenses (that is, the lenses with positive refractive power between the first lens and the imaging surface), thereby ensuring that the on-axis The field of view has good imaging quality.

Preferably, the imaging lens group also satisfies the following conditional formula: 0<f/R ₇₂ <5, where f represents the focal length of the imaging lens group, and R ₇₂ represents the curvature radius of the image side surface of the seventh lens. Thereby, adjusting the curvature of the image side surface of the seventh lens helps the principal point of the imaging lens group to be far away from the imaging surface, thereby shortening the back focal length of the imaging lens group and maintaining the miniaturization of the imaging lens group.

Preferably, the imaging lens group also satisfies the following conditional formula: -2<R ₃₂ /R ₃₁ <1, wherein R ₃₂ represents the curvature radius of the image side surface of the third lens, and R ₃₁ represents the object side surface of the third lens. Radius of curvature. Thereby, the aberration generated by the second lens having the stronger refractive power can be corrected.

Preferably, the imaging lens group also satisfies the following conditional formula: -2<(R ₆₁ +R ₆₂ )/(R ₆₁ -R ₆₂ )≤2, wherein R ₆₁ represents the curvature radius of the object side surface of the sixth lens, and R ₆₂ represents the curvature radius of the image side surface of the sixth lens. When this condition is satisfied, the surface shape of the sixth lens can be adjusted appropriately, and the astigmatism of the imaging lens group can be further corrected.

Preferably, the imaging lens group also satisfies the following conditional formula: 0.1<T ₂₃ /(CT ₂ +CT ₃ )≤0.5, where T ₂₃ represents that the image side of the second lens to the object side of the third lens is on the optical axis CT ₂ represents the thickness of the second lens on the optical axis, and CT ₃ represents the thickness of the third lens on the optical axis. Satisfying this condition can avoid that the distance between the thin second lens and the third lens is too large, which causes difficulty in forming and assembling.

It should be noted that the refractive power refers to the deflection of the propagation direction of the light when the parallel light passes through the optical system, which is used to characterize the refractive power of the optical system to the incident parallel light beam. The optical system has positive refractive power, indicating that the refraction of light is convergent; the optical system has negative refractive power, indicating that the refraction of light is divergent. In the imaging lens set of the present invention, if the refractive power or focal length of the lens does not define its area position, it means that the refractive power or focal length of the lens can be the refractive power or focal length of the lens at the near optical axis.

For the arrangement of each lens in the imaging lens group, in the case of left to right from the object side to the image side, the object side of the lens is convex, which means that the object side of the lens is cut at any point on the surface, and the surface is always at the cut surface. On the right side, its radius of curvature is positive, on the contrary, the side of the object is concave, and its radius of curvature is negative. The convex side of the lens image means that the side of the lens image is cut at any point on the surface. The surface is always on the left side of the cut surface, and its radius of curvature is negative. On the contrary, the side of the image is concave and its radius of curvature is positive. If a section is made through any point on the object side or the image side of the lens, and the surface has both a part on the left side of the section and a part on the right side of the section, then the surface has an inflection point. The above is still applicable to the judgment of concavity and convexity at the near optical axis on the object side and the image side of the lens. In addition, the paraxial region refers to the region near the optical axis. In the imaging lens set of the present invention, if the lens surface is convex and the position of the convex surface is not defined, it means that the convex surface can be located at the near optical axis of the lens surface; if the surface of the lens is concave and the position of the concave surface is not defined, it means that the The concave surface may be located near the optical axis of the lens surface.

In the imaging lens set disclosed in the present invention, the lenses are all made of materials with high light transmittance and excellent machinability. For example, using plastic to make the lens is beneficial to the manufacture and molding of the lens, so as to improve the manufacturing yield, and this condition is satisfied. The material cost is low and easy to obtain, which is beneficial to reduce the production cost. In addition, the object side and image side of each lens can be aspherical surfaces (ASP), and the aspherical surfaces can be easily made into shapes other than spherical surfaces, and more control variables can be obtained to reduce aberrations, thereby reducing the number of lenses used. Therefore, The overall length of the imaging lens group can be effectively reduced.

In addition, in the imaging lens group of the present invention, at least one diaphragm can be set as required to reduce stray light and help improve imaging quality. In the present invention, the aperture configuration can be a central aperture, that is, the aperture is arranged between the first lens and the imaging surface, which helps to expand the field of view of the system and enables the camera lens group to have the advantage of a wide-angle lens.

The imaging lens assembly of the present invention will be described in detail below with specific embodiments. It should be noted that the embodiments in the present application and the features of the embodiments may be combined with each other in the case of no conflict. The present application will be described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

[Example 1]

Please refer to FIG. 1 , which shows a schematic structural diagram of the imaging lens group of the first embodiment. As can be seen from the figure, the imaging lens group in this embodiment includes a first lens 110, a second lens 120, an aperture 100, a third lens 130, a fourth lens 140, and a fifth lens 150, which are sequentially arranged along the optical axis from the object side to the image side. , the sixth lens 160 and the seventh lens 170, each lens has an object side facing the object side and an image side facing the image side, and the object side and the image side of each lens are aspherical.

The first lens 110 has a negative refractive power, the object side 111 is convex at the near optical axis, and the image side 112 is concave at the near optical axis. The second lens 120 has a positive refractive power, its object side 121 is convex at the near optical axis, and its image side 122 is concave at the near optical axis. The third lens 130 has a negative refractive power, the object side 131 is concave at the near optical axis, and the image side 132 is concave at the near optical axis. The fourth lens 140 has a positive refractive power, the object side 141 is convex at the near optical axis, the image side 142 is concave at the near optical axis, and the image side includes at least one inflection point. The fifth lens 150 has a negative refractive power, its object side 151 is concave at the near optical axis, and its image side 152 is convex at the near optical axis. The sixth lens 160 has a positive refractive power, the object side 161 is convex at the near optical axis, and the image side 162 is convex at the near optical axis. The seventh lens 170 has negative refractive power, the object side 171 is concave at the near optical axis, the image side 172 is concave at the near optical axis, and the image side includes at least one inflection point. In addition, the camera lens group further includes an infrared filter 180 placed between the seventh lens 170 and the imaging surface 190, and the infrared filter 180 filters out the infrared band light entering the camera lens group to prevent the infrared light from irradiating the photosensitive Noise is generated on the chip. The optional filter material is glass and does not affect the focal length.

Table 9 shows the values that satisfy the conditional expression of the imaging lens group of this embodiment. In addition, please refer to FIG. 25 and FIG. 26 , the vertical distance Yc ₄₂ from the inflection point 1421 on the image side of the fourth lens 140 to the optical axis is shown in FIG. 25 . The vertical distance Yc ₇₂ of the axis is shown in FIG. 26 .

The detailed optical data of Example 1 is shown in Table 1-1. The units of curvature radius, thickness and focal length are millimeters, f is the focal length of the camera lens group, Fno is the aperture value, FOV is the maximum field of view, and the surface 0- 18 represents the surfaces from the object side to the image side in order. The surfaces 1-15 represent the first lens object side 111, the first lens image side 112, the second lens object side 121, the second lens image side 122, the aperture 100, the third lens object side 131, and the third lens image side. 132, fourth lens object side 141, fourth lens image side 142, fifth lens object side 151, fifth lens image side 152, sixth lens object side 161, sixth lens image side 162, seventh lens object side 171 and the seventh lens like side 172.

Table 1-1

其中，X表示非球面上距离光轴为Y的点，其与相切于非球面光轴上顶点的切面的相对距离；R表示曲率半径；Y表示非球面曲线上的点与光轴的垂直距离；k表示圆锥系数；Ai表示第i阶非球面系数。Each lens in this camera lens group adopts aspherical design, and the curve equation of the aspherical surface is expressed as follows:

Among them, X represents the point on the aspheric surface whose distance from the optical axis is Y, and its relative distance from the tangent plane tangent to the vertex on the optical axis of the aspheric surface; R represents the radius of curvature; Y represents the point on the aspheric curve and the perpendicular to the optical axis distance; k is the conic coefficient; Ai is the i-th order aspheric coefficient.

The aspheric coefficients of each lens in this embodiment are shown in Table 1-2, k is the conic coefficient in the aspheric curve equation, and A4-A16 are the 4th-16th order aspheric coefficients of the lens surface, respectively. The distortion field curve and spherical aberration curve of the imaging lens group in this embodiment are shown in Figure 2 and Figure 3 respectively, wherein the wavelength in the distortion field curve is 0.555 μm, and the wavelengths in the spherical aberration curve are 0.470 μm, 0.510 μm, 0.555μm, 0.610μm and 0.650μm. In addition, the following tables of the embodiments are the schematic diagrams of the imaging lens group, the distortion field curvature and spherical aberration curves corresponding to the respective embodiments, and the definitions of the data in the tables are the same as those in Table 1-1 and Table 1-2 of Example 1. .

Table 1-2

[Example 2]

Please refer to FIG. 4 , which shows a schematic structural diagram of the imaging lens group of the second embodiment. As can be seen from the figure, the imaging lens group in this embodiment includes a first lens 210, a second lens 220, an aperture 200, a third lens 230, a fourth lens 240, and a fifth lens 250, which are sequentially arranged along the optical axis from the object side to the image side. , the sixth lens 260 and the seventh lens 270, each lens has an object side facing the object side and an image side facing the image side, and the object side and the image side of each lens are aspherical.

The first lens 210 has negative refractive power, the object side 211 is convex at the near optical axis, and the image side 212 is concave at the near optical axis. The second lens 220 has a positive refractive power, its object side surface 221 is convex at the near optical axis, and its image side surface 222 is concave at the near optical axis. The third lens 230 has a negative refractive power, the object side surface 231 is concave at the near optical axis, and the image side surface 232 is concave at the near optical axis. The fourth lens 240 has a positive refractive power, its object side surface 241 is convex at the near optical axis, its image side surface 242 is concave at the near optical axis, and its image side surface includes at least one inflection point. The fifth lens 250 has a negative refractive power, the object side 251 is concave at the near optical axis, and the image side 252 is convex at the near optical axis. The sixth lens 260 has a positive refractive power, the object side surface 261 is convex at the near optical axis, and the image side surface 262 is convex at the near optical axis. The seventh lens 270 has negative refractive power, the object side surface 271 is concave at the near optical axis, the image side surface 272 is concave at the near optical axis, and the image side surface includes at least one inflection point. In addition, the camera lens group further includes an infrared filter 280 placed between the seventh lens 270 and the imaging surface 290, and the infrared filter 280 filters out the infrared band light entering the camera lens group, so as to prevent the infrared light from irradiating the photosensitive Noise is generated on the chip. The optional filter material is glass and does not affect the focal length.

Please refer to Table 2-1, Table 2-2 and Table 9 below. The corresponding distortion field curves and spherical aberration curves are shown in Figure 5 and Figure 6, respectively.

table 2-1

Table 2-2

[Example 3]

Please refer to FIG. 7 , which shows a schematic structural diagram of the imaging lens group of the third embodiment. As can be seen from the figure, the imaging lens group in this embodiment includes a first lens 310, a second lens 320, an aperture 300, a third lens 330, a fourth lens 340, and a fifth lens 350, which are sequentially arranged along the optical axis from the object side to the image side. , the sixth lens 360 and the seventh lens 370, each lens has an object side facing the object side and an image side facing the image side, and the object side and the image side of each lens are aspherical.

The first lens 310 has a negative refractive power, the object side surface 311 is convex at the near optical axis, and the image side surface 312 is concave at the near optical axis. The second lens 320 has a positive refractive power, its object side surface 321 is convex at the near optical axis, and its image side surface 322 is concave at the near optical axis. The third lens 330 has a positive refractive power, its object side surface 331 is concave at the near optical axis, and its image side surface 332 is convex at the near optical axis. The fourth lens 340 has a positive refractive power, its object side surface 341 is convex at the near optical axis, its image side surface 342 is concave at the near optical axis, and its image side surface includes at least one inflection point. The fifth lens 350 has a negative refractive power, the object side 351 is concave at the near optical axis, and the image side 352 is convex at the near optical axis. The sixth lens 360 has a positive refractive power, its object side surface 361 is convex at the near optical axis, and its image side surface 362 is convex at the near optical axis. The seventh lens 370 has negative refractive power, the object side surface 371 is concave at the near optical axis, the image side surface 372 is concave at the near optical axis, and the image side surface includes at least one inflection point. In addition, the camera lens group further includes an infrared filter 380 placed between the seventh lens 370 and the imaging surface 390, and the infrared filter 380 filters out the infrared band light entering the camera lens group to prevent the infrared light from irradiating the photosensitive Noise is generated on the chip. The optional filter material is glass and does not affect the focal length.

Please refer to Table 3-1, Table 3-2 and Table 9 below. The corresponding distortion field curves and spherical aberration curves are shown in Figure 8 and Figure 9, respectively.

Table 3-1

Table 3-2

[Example 4]

Please refer to FIG. 10 , which shows a schematic structural diagram of the imaging lens group of the fourth embodiment. As can be seen from the figure, the imaging lens group in this embodiment includes a first lens 410, a second lens 420, an aperture 400, a third lens 430, a fourth lens 440, and a fifth lens 450, which are sequentially arranged along the optical axis from the object side to the image side. , the sixth lens 460 and the seventh lens 470, each lens has an object side facing the object side and an image side facing the image side, and the object side and the image side of each lens are aspherical.

The first lens 410 has a negative refractive power, the object side 411 is convex at the near optical axis, and the image side 412 is concave at the near optical axis. The second lens 420 has a positive refractive power, its object side surface 421 is convex at the near optical axis, and its image side surface 422 is concave at the near optical axis. The third lens 430 has a negative refractive power, its object side surface 431 is concave at the near optical axis, and its image side surface 432 is concave at the near optical axis. The fourth lens 440 has a positive refractive power, its object side surface 441 is convex at the near optical axis, its image side surface 442 is concave at the near optical axis, and its image side surface includes at least one inflection point. The fifth lens 450 has a positive refractive power, its object side surface 451 is concave at the near optical axis, and its image side surface 452 is convex at the near optical axis. The sixth lens 460 has a positive refractive power, and its object side surface 461 is concave at the near optical axis, and its image side surface 462 is convex at the near optical axis. The seventh lens 470 has negative refractive power, the object side surface 471 is concave at the near optical axis, the image side surface 472 is concave at the near optical axis, and the image side surface includes at least one inflection point. In addition, the camera lens group further includes an infrared filter 480 placed between the seventh lens 470 and the imaging surface 490, and the infrared filter 480 filters out the infrared band light entering the camera lens group to prevent the infrared light from irradiating the photosensitive Noise is generated on the chip. The optional filter material is glass and does not affect the focal length.

Please refer to Table 4-1, Table 4-2 and Table 9 below. The corresponding distortion field curves and spherical aberration curves are shown in Figure 11 and Figure 12, respectively.

Table 4-1

Table 4-2

[Example 5]

Please refer to FIG. 13 , which shows a schematic structural diagram of the imaging lens group of the fifth embodiment. As can be seen from the figure, the imaging lens group in this embodiment includes a first lens 510, a second lens 520, an aperture 500, a third lens 530, a fourth lens 540, and a fifth lens 550, which are sequentially arranged along the optical axis from the object side to the image side. , the sixth lens 560 and the seventh lens 570, each lens has an object side facing the object side and an image side facing the image side, and the object side and the image side of each lens are aspherical.

The first lens 510 has a negative refractive power, its object side 511 is convex at the near optical axis, and its image side 512 is concave at the near optical axis. The second lens 520 has a positive refractive power, its object side 521 is convex at the near optical axis, and its image side 522 is concave at the near optical axis. The third lens 530 has a negative refractive power, its object side 531 is convex at the near optical axis, and its image side 532 is concave at the near optical axis. The fourth lens 540 has a positive refractive power, its object side surface 541 is convex at the near optical axis, its image side surface 542 is concave at the near optical axis, and its image side surface includes at least one inflection point. The fifth lens 550 has a negative refractive power, its object side 551 is concave at the near optical axis, and its image side 552 is convex at the near optical axis. The sixth lens 560 has a positive refractive power, its object side 561 is convex at the near optical axis, and its image side 562 is convex at the near optical axis. The seventh lens 570 has negative refractive power, the object side surface 571 is concave at the near optical axis, the image side surface 572 is concave at the near optical axis, and the image side surface includes at least one inflection point. In addition, the camera lens group further includes an infrared filter 580 placed between the seventh lens 570 and the imaging surface 590, and the infrared filter 580 filters out the infrared band light entering the camera lens group to prevent the infrared light from irradiating the photosensitive Noise is generated on the chip. The optional filter material is glass and does not affect the focal length.

Please refer to Table 5-1, Table 5-2 and Table 9 below. The corresponding distortion field curves and spherical aberration curves are shown in Figure 14 and Figure 15, respectively.

Table 5-1

Table 5-2

[Example 6]

Please refer to FIG. 16 , which shows a schematic structural diagram of the imaging lens group of the sixth embodiment. As can be seen from the figure, the imaging lens group in this embodiment includes a first lens 610, a second lens 620, an aperture 600, a third lens 630, a fourth lens 640, and a fifth lens 650, which are sequentially arranged along the optical axis from the object side to the image side. , the sixth lens 660 and the seventh lens 670, each lens has an object side facing the object side and an image side facing the image side, and the object side and the image side of each lens are aspherical.

The first lens 610 has a negative refractive power, the object side surface 611 is convex at the near optical axis, and the image side surface 612 is concave at the near optical axis. The second lens 620 has a positive refractive power, its object side surface 621 is convex at the near optical axis, and its image side surface 622 is concave at the near optical axis. The third lens 630 has a negative refractive power, the object side surface 631 is concave at the near optical axis, and the image side surface 632 is concave at the near optical axis. The fourth lens 640 has a positive refractive power, its object side surface 641 is convex at the near optical axis, its image side surface 642 is concave at the near optical axis, and its image side surface includes at least one inflection point. The fifth lens 650 has a negative refractive power, the object side 651 is concave at the near optical axis, and the image side 652 is convex at the near optical axis. The sixth lens 660 has a positive refractive power, the object side 661 is convex at the near optical axis, and the image side 662 is concave at the near optical axis. The seventh lens 670 has negative refractive power, the object side surface 671 is concave at the near optical axis, the image side surface 672 is concave at the near optical axis, and the image side surface includes at least one inflection point. In addition, the camera lens group further includes an infrared filter 680 placed between the seventh lens 670 and the imaging surface 690, and the infrared filter 680 filters out the infrared band light entering the camera lens group to prevent the infrared light from irradiating the photosensitive Noise is generated on the chip. The optional filter material is glass and does not affect the focal length.

Please refer to Table 6-1, Table 6-2 and Table 9 below. The corresponding distortion field curves and spherical aberration curves are shown in Figure 17 and Figure 18, respectively.

Table 6-1

Table 6-2

[Example 7]

Please refer to FIG. 19 , which shows a schematic structural diagram of the imaging lens group of the seventh embodiment. As can be seen from the figure, the imaging lens group in this embodiment includes a first lens 710, a second lens 720, an aperture 700, a third lens 730, a fourth lens 740, and a fifth lens 750, which are sequentially arranged along the optical axis from the object side to the image side. , the sixth lens 760 and the seventh lens 770, each lens has an object side facing the object side and an image side facing the image side, and the object side and the image side of each lens are aspherical.

The first lens 710 has a negative refractive power, its object side 711 is convex at the near optical axis, and its image side 712 is concave at the near optical axis. The second lens 720 has a positive refractive power, its object side 721 is convex at the near optical axis, and its image side 722 is concave at the near optical axis. The third lens 730 has a negative refractive power, the object side surface 731 is concave at the near optical axis, and the image side surface 732 is concave at the near optical axis. The fourth lens 740 has a positive refractive power, its object side 741 is convex at the near optical axis, its image side 742 is concave at the near optical axis, and its image side includes at least one inflection point. The fifth lens 750 has a negative refractive power, its object side 751 is concave at the near optical axis, and its image side 752 is convex at the near optical axis. The sixth lens 760 has a positive refractive power, its object side 761 is convex at the near optical axis, and its image side 762 is convex at the near optical axis. The seventh lens 770 has negative refractive power, the object side surface 771 is concave at the near optical axis, the image side surface 772 is concave at the near optical axis, and the image side surface includes at least one inflection point. In addition, the camera lens group further includes an infrared filter 780 placed between the seventh lens 770 and the imaging surface 790, and the infrared filter 780 filters out the infrared band light entering the camera lens group, so as to prevent the infrared light from irradiating the photosensitive Noise is generated on the chip. The optional filter material is glass and does not affect the focal length.

Please refer to Table 7-1, Table 7-2 and Table 9 below. The corresponding distortion field curves and spherical aberration curves are shown in Figure 20 and Figure 21, respectively.

Table 7-1

Table 7-2

[Example 8]

Please refer to FIG. 22 , which shows a schematic structural diagram of the imaging lens group of the eighth embodiment. As can be seen from the figure, the imaging lens group in this embodiment includes a first lens 810, a second lens 820, an aperture 800, a third lens 830, a fourth lens 840, and a fifth lens 850, which are sequentially arranged along the optical axis from the object side to the image side. , the sixth lens 860 and the seventh lens 870, each lens has an object side facing the object side and an image side facing the image side, and the object side and the image side of each lens are aspherical.

The first lens 810 has negative refractive power, the object side 811 is convex at the near optical axis, and the image side 812 is concave at the near optical axis. The second lens 820 has a positive refractive power, its object side 821 is convex at the near optical axis, and its image side 822 is concave at the near optical axis. The third lens 830 has a negative refractive power, and its object side surface 831 is concave at the near optical axis, and its image side surface 832 is concave at the near optical axis. The fourth lens 840 has a positive refractive power, its object side 841 is convex at the near optical axis, its image side 842 is concave at the near optical axis, and its image side includes at least one inflection point. The fifth lens 850 has a negative refractive power, its object side 851 is concave at the near optical axis, and its image side 852 is convex at the near optical axis. The sixth lens 860 has a positive refractive power, and its object side 861 is convex at the near optical axis, and its image side 862 is convex at the near optical axis. The seventh lens 870 has negative refractive power, the object side surface 871 is concave at the near optical axis, the image side surface 872 is concave at the near optical axis, and the image side surface includes at least one inflection point. In addition, the camera lens group further includes an infrared filter 880 placed between the seventh lens 870 and the imaging surface 890, and the infrared filter 880 filters out the infrared band light entering the camera lens group to prevent the infrared light from irradiating the photosensitive Noise is generated on the chip. The optional filter material is glass and does not affect the focal length.

Please refer to Table 8-1, Table 8-2 and Table 9 below. The corresponding distortion field curves and spherical aberration curves are shown in Figure 23 and Figure 24, respectively.

Table 8-1

Table 8-2

In conclusion, Examples 1 to 8 satisfy the relationships shown in Table 9, respectively.

Correspondingly, an embodiment of the present invention further provides an electronic device, including an imaging device, the imaging device includes an electronic photosensitive element and the above-mentioned imaging lens group, the electronic photosensitive element is disposed on the imaging surface of the imaging lens group .

In the electronic device provided in this embodiment, the imaging lens group used in the imaging device is a seven-piece lens structure. By reasonably defining the distance between the first lens and the second lens on the optical axis and the distance between the fifth lens and the sixth lens The ratio of the separation distance on the optical axis can balance the spatial configuration of the imaging lens group, thereby improving the degree of cooperation between the lenses at the object side, and making the lens at the image side have sufficient distance to reconcile aberrations. This imaging lens The group can have the characteristics of large aperture, high pixel, high resolution, excellent field of view, etc., and can provide good imaging quality to meet application requirements.

The imaging lens group and the electronic device provided by the present invention have been described in detail above. The principles and implementations of the present invention are described herein by using specific examples, and the descriptions of the above embodiments are only used to help understand the method and the core idea of the present invention. It should be pointed out that for those skilled in the art, without departing from the principle of the present invention, several improvements and modifications can also be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims (9)

1. A photographing lens assembly comprising seven lens elements, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element and a seventh lens element, each lens element having an object side surface facing the object side and an image side surface facing the image side, wherein:

the first lens element and the seventh lens element have negative refractive power, the second lens element and the sixth lens element have positive refractive power, the fourth lens element has positive refractive power, the object-side surface of the first lens element is convex at a paraxial region, the image-side surface of the fourth lens element is concave at a paraxial region, the object-side surface of the fifth lens element is concave at a paraxial region, and the image-side surface of the seventh lens element is concave at a paraxial region;

and satisfies the following conditional expressions:

0.2<T₁₂/T₅₆<2；

wherein, T₁₂Represents the distance T from the image side surface of the first lens to the object side surface of the second lens on the optical axis₅₆The distance between the image side surface of the fifth lens and the object side surface of the sixth lens on the optical axis is represented;

the following conditional expressions are also satisfied: -2<(R₆₁+R₆₂)/(R₆₁-R₆₂) 2 or less, wherein R is₆₁Represents a radius of curvature, R, of an object-side surface of the sixth lens₆₂Represents a radius of curvature of the image-side surface of the sixth lens element.

2. An imaging lens group according to claim 1, further satisfying the following conditional expression: 0<YC₄₂/YC₇₂<0.9 wherein Yc₄₂Represents the vertical distance Yc from the point of inflection of the image-side surface of the fourth lens to the optical axis₇₂And the vertical distance from the inflection point of the image side surface of the seventh lens to the optical axis is represented.

3. An imaging lens group according to claim 1, further satisfying the following conditional expression: f/EPD is less than or equal to 1.80, wherein f represents the focal length of the shooting lens group, and EPD represents the entrance pupil diameter of the shooting lens group.

4. An imaging lens group according to claim 1, further satisfying the following conditional expression: 0.5<CT₄/CT₆<2.5, wherein CT₄Represents the thickness of the fourth lens on the optical axis, CT₆Represents the thickness of the sixth lens on the optical axis.

5. An imaging lens group according to claim 1, further satisfying the following conditional expression: -10<f₁/f<-1, wherein f₁Denotes a focal length of the first lens, and f denotes a focal length of the image pickup lens group.

6. An imaging lens group according to claim 1, further satisfying the following conditional expression: 0<f/R₇₂<5, where f denotes a focal length of the image pickup lens group, R₇₂Represents a radius of curvature of the image side surface of the seventh lens.

7. An imaging lens group according to claim 1, further satisfying the following conditional expression: -2<R₃₂/R₃₁<1, wherein R₃₂Represents a radius of curvature, R, of the image-side surface of the third lens₃₁Representing a radius of curvature of an object-side surface of the third lens.

8. An imaging lens group according to claim 1, further satisfying the following conditional expression: 0.1<T₂₃/(CT₂+CT₃) Less than or equal to 0.5, wherein T is₂₃Represents the distance on the optical axis from the image side surface of the second lens to the object side surface of the third lens, CT₂Representing the thickness of said second lens on the optical axis, CT₃Represents the thickness of the third lens on the optical axis.

9. An electronic apparatus characterized by comprising an image pickup device including an electron-sensitive element provided to an imaging surface of an image pickup lens group according to any one of claims 1 to 8, and the image pickup lens group.

Images