CN110058381A - optical lens and electronic device - Google Patents

Abstract

The invention discloses an optical lens, which sequentially comprises 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 from an object side to an image side, wherein the first lens element and the third lens element both have positive refractive power, the seventh lens element has negative refractive power, an object-side surface of the first lens element is convex at a paraxial region, an object-side surface of the third lens element is convex at the paraxial region, an object-side surface of the fourth lens element is convex at the paraxial region, and an image-side surface of the fourth lens element is concave at the paraxial region. The optical lens has excellent optical characteristics, obtains good imaging quality, optimizes the surface shape of the image side surface of the second lens, and can effectively correct coma aberration, distortion and chromatic aberration of the imaging lens, thereby having the characteristics of large aperture, high pixel, high resolution and the like, having excellent optical characteristics and providing good imaging quality. The invention also discloses an electronic device.

Description

Optical Lenses and Electronic Equipment

technical field

The present invention relates to the technical field of optical devices, in particular to an optical lens. 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 photosensitive devices has been reduced. Accordingly, imaging lenses are gradually developing into the field of high pixels. Therefore, the imaging quality requirements for optical imaging lenses are also increasing.

Traditional optical lenses mounted on portable electronic products mostly use three-piece or four-piece lens structures, and existing optical imaging lenses can no longer meet higher-end photography systems. 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 have gradually appeared in the design of imaging lenses. On the other hand, in order to make the imaging surface of the imaging lens have sufficient illuminance, the large aperture characteristic is one of the indispensable elements at present. Therefore, an imaging lens 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 optical lens with the characteristics of large aperture, high pixel, high resolution, 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 optical lens 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, and each lens has a The object side and the image side facing the image side, the object side and the image side of each lens are aspherical, where:

Both the first lens and the third lens have positive refractive power, the seventh lens has negative refractive power, the object side of the first lens is convex at the near optical axis, and the object side of the third lens is at The near-optical axis is a convex surface, the object side of the fourth lens is a convex surface at the near-optical axis, and its image side is concave at the near-optical axis;

and satisfy the following conditions:

0.2<Yc ₂₂ /SD ₂₂ <1.0;

Wherein, Yc ₂₂ represents the vertical distance from the inflection point on the image side of the second lens to the optical axis, and SD ₂₂ represents the effective radius of the image side of the second lens.

Preferably, the sixth lens has a positive refractive power, the object side surface is convex at the near optical axis, and the image side surface is convex at the near optical axis.

Preferably, the following conditional formula is also satisfied: 0.5≤Yc ₃₂ /Yc ₄₂ ≤1.5, wherein Yc ₃₂ represents the vertical distance from the inflection point on the image side of the third lens to the optical axis, and Yc ₄₂ represents the fourth lens The vertical distance from the inflection point on the mirror side to the optical axis.

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

Preferably, the following conditional formula is also satisfied: 0.13≤BL/TL≤0.3, where BL represents the distance from the image side of the seventh lens to the imaging surface on the optical axis, and TL represents the distance from the object side of the first lens to the imaging surface on the optical axis distance on the optical axis.

Preferably, the following conditional formula is also satisfied: 0.3≦f/f ₃ ≦0.6, where f represents the focal length of the optical lens, and f ₃ represents the focal length of the third lens.

Preferably, the following conditional formula is also satisfied: 0.5<CT ₆ /ET ₆ <1.5, wherein CT ₆ represents the thickness of the sixth lens on the optical axis, and ET ₆ represents the edge thickness of the sixth lens.

Preferably, the following conditional formula is also satisfied: 1.5<(CT ₆ +CT ₇ )/T ₆₇ <3.5, wherein CT ₆ represents the thickness of the sixth lens on the optical axis, and CT ₇ represents the thickness of the seventh lens on the optical axis The thickness on the axis, T ₆₇ represents the distance on the optical axis from the image side of the sixth lens to the object side of the seventh lens.

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

As can be seen from the above technical solutions, the optical lens provided by the present invention includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and In the seventh lens, the light from the object side passes through each lens in sequence, and is imaged onto the imaging surface located on the image side of the seventh lens. The optical lens is a seven-piece lens structure, each lens adopts a reasonable surface structure and the optimal range combination of the optical parameters of each lens, which can have excellent optical characteristics and obtain good imaging quality. The coma, distortion and chromatic aberration of the imaging lens can be effectively corrected by optimizing the surface shape of the image side surface of the second lens, thereby effectively improving the imaging quality. The optical lens provided by the present invention can have the characteristics of large aperture, high pixel, high resolution, etc., can have excellent optical characteristics, 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 optical lens provided in Embodiment 1 of the present invention;

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

Fig. 3 is the spherical aberration curve diagram of the optical lens in Embodiment 1 of the present invention;

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

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

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

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

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

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

10 is a schematic diagram of an optical lens according to Embodiment 4 of the present invention;

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

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

13 is a schematic diagram of an optical lens according to Embodiment 5 of the present invention;

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

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

16 is a schematic diagram of Yc ₂₂ and SD ₂₂ in the optical lens according to Embodiment 1 of the present invention;

17 is a schematic diagram of Yc ₃₂ in the optical lens according to Embodiment 1 of the present invention;

FIG. 18 is a schematic diagram of Yc ₄₂ in the optical lens 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 present invention provides an optical lens, 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, and each lens has a direction of The object side on the object side and the image side on the image side further include an imaging surface on the image side of the seventh lens, and an infrared filter disposed between the seventh lens and the imaging surface. Filters do not affect the focal length of the imaging lens. .

Specifically, the first lens has a positive refractive power, and its object side surface is convex at the near optical axis, and the configuration of the positive refractive power of the lens can be adjusted, which helps to shorten the total length of the optical lens. The image side surface of the first lens may be concave at the near optical axis, which can adjust low-order aberrations.

The second lens may have a negative refractive power, which is beneficial to correct the aberration generated by the first lens, and its image side surface is concave at the near optical axis, which is beneficial to correct the aberration generated by the first lens to improve the imaging quality.

The third lens has positive refractive power, which can effectively distribute the refractive power of the first lens, help reduce the sensitivity of the imaging lens, and adjust the refractive power distribution of the optical lens to avoid excessive astigmatism and distortion around the image increase. The object side surface of the third lens is convex at the near optical axis, and the image side surface of the third lens can be concave at the near optical axis, which is helpful to correct the astigmatism of the optical lens and improve the imaging quality.

The fourth lens has a refractive power, which can be adjusted in conjunction with the refractive power of the third lens, so that the distribution of the refractive power of the photographing system is relatively uniform. The object side of the fourth lens is convex at the near optical axis, and there is a change from convex to concave from the near optical axis to the edge, and its image side is concave at the near optical axis and there is a change from the near optical axis to the edge. Can strengthen the correction of astigmatism.

The fifth lens has refractive power, and its object side can be convex at the near optical axis, and its image side can be concave at the near optical axis, which helps to avoid excessive concentration of refractive power on the fifth lens, and can reduce the number of lens The curvature of the periphery is too large, which makes the lens too curved, thereby reducing the problem of poor molding.

The seventh lens has a negative refractive power, and both the object side and the image side can be concave, which helps to keep the principal point of the optical lens effectively away from the imaging surface, so as to strengthen and shorten the back focal length, thereby reducing the total length of the optical lens , to 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, and it has an inflection point, which can effectively suppress the angle at which the light in the off-axis field of view is incident on the image sensing element. Aberrations in off-axis fields of view are well corrected.

By reasonably controlling the positive and negative distribution of the focal power of each lens in the optical lens, the low-order aberrations of the control system can be effectively balanced, and the tolerance sensitivity of the system can be reduced, which is conducive to ensuring the miniaturization of the optical lens. In the optical imaging lens, there is no relative movement between the lenses, and an air gap can be provided between each two adjacent lenses on the optical axis, which is beneficial to the assembly of the lenses and improves the manufacturing yield.

Each lens of the optical lens is made of materials with high light transmittance and excellent machinability, which satisfies the condition 1.60<N _max <1.70, where N _max represents the first lens, the second lens, the third lens, and the fourth lens The maximum value among the refractive indices of the fifth lens, the sixth lens, and the seventh lens is beneficial to the manufacture and molding of the lens, so as to improve the manufacturing yield, and the materials satisfying this condition are cheap and easy to obtain, which is beneficial to reduce the production cost. In addition, the second lens satisfies 0.2<Yc ₂₂ /SD ₂₂ <1.0, Yc ₂₂ represents the vertical distance from the inflection point closest to the optical axis on the image side of the second lens to the optical axis, and SD ₂₂ represents the second transparent The effective radius of the mirrored sides. By optimizing the surface shape of the image side surface of the second lens, the coma, distortion and chromatic aberration of the imaging lens can be effectively corrected, thereby effectively improving the image quality. Therefore, the optical lens of the present invention can have the characteristics of large aperture, high pixel, high resolution, etc., can have excellent optical characteristics, provide good imaging quality, and meet application requirements.

Preferably, the sixth lens has a positive refractive power, the object side surface is convex at the near optical axis, and there is a change from the convex surface to the concave surface from the near optical axis to the edge, and the image side surface is convex at the near optical axis, which is beneficial to Correct the higher-order aberrations of the imaging lens and improve its resolution to obtain good imaging quality.

Preferably, the optical lens also satisfies the following conditional formula: 0.5≤Yc ₃₂ /Yc ₄₂ ≤1.5, wherein Yc ₃₂ represents the vertical distance from the inflection point on the image side of the third lens to the optical axis, and Yc ₄₂ represents the The vertical distance from the inflection point on the image side of the fourth lens to the optical axis. Satisfying this condition can effectively increase the height of the light, meet the requirements of high-pixel optical lenses, and ease the light deflection, and can effectively reduce the sensitivity of the imaging lens, and can effectively correct the coma, distortion and chromatic aberration of the optical lens. . Preferably, the following conditions may be satisfied: 0.5≦Yc ₃₂ /Yc ₄₂ ≦1.0.

Preferably, the optical lens also satisfies the following conditional formula: 0<f/R ₇₂ <5, where f represents the focal length of the optical lens, and R ₇₂ represents the curvature radius of the image side surface of the seventh lens. By controlling the ratio of the focal length of the imaging lens to the curvature radius of the image side surface of the seventh lens, the principal point of the imaging lens is kept away from the imaging surface, thereby shortening the back focal length of the imaging lens and maintaining the miniaturization of the lens. Preferably, the following conditions may be satisfied: 1.0<f/R ₇₂ <2.0.

Preferably, the optical lens 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 Indicates the curvature radius of the image side surface of the sixth lens. By reasonably configuring the curvature radii of the object side and the image side of the sixth lens, the surface shape of the sixth lens can be adjusted to correct off-axis aberrations and allow light to have appropriate angles of incidence and exit from the sixth lens, which helps to increase the area of the imaging surface. Preferably, the following conditions may be satisfied: -1<(R ₆₁ +R ₆₂ )/(R ₆₁ -R ₆₂ )<1.

Preferably, the optical lens also satisfies the following conditional formula: 0.13≤BL/TL≤0.3, where BL represents the distance from the image side of the seventh lens to the imaging surface on the optical axis, and TL represents the distance from the object side of the first lens to the The distance of the image plane on the optical axis. An optical imaging lens that satisfies this condition can ensure the back focus on the basis of miniaturization, which is beneficial to improve the manufacturability of the optical lens.

Preferably, the optical lens also satisfies the following conditional formula: 0.3≦f/f ₃ ≦0.6, where f represents the focal length of the optical lens, and f ₃ represents the focal length of the third lens. By reasonably configuring the focal length of the third lens, the positive power of the third lens can be made not too weak relative to the power of the entire system, and the first lens and the third lens can appropriately share the main imaging function of the imaging lens. , can maintain a small aperture value and can correct spherical aberration well. In addition, the positive refractive power of the third lens can be prevented from being too strong with respect to the refractive power of the entire imaging lens, the angle of view can be widened, and the overall length of the lens can be appropriately shortened.

Preferably, the optical lens also satisfies the following conditional formula: 0.5<CT ₆ /ET ₆ <1.5, wherein CT ₆ represents the thickness of the sixth lens on the optical axis, and ET ₆ represents the edge thickness of the sixth lens. By reasonably adjusting the structural size of the sixth lens, the distortion amount of the optical lens can be balanced while reducing the size of the optical lens and maintaining good processability.

Preferably, the optical lens also satisfies the following conditional formula: 1.5<(CT ₆ +CT ₇ )/T ₆₇ <3.5, wherein CT ₆ represents the thickness of the sixth lens on the optical axis, and CT ₇ represents the seventh lens The thickness of the lens on the optical axis, T ₆₇ represents the distance on the optical axis from the image side of the sixth lens to the object side of the seventh lens. Satisfying this condition is conducive to slowing down the deflection of light and increasing the image surface, thereby enabling the optical lens to have low-sensitivity, high-quality imaging effects.

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 optical lens provided by the present invention, if the refractive power or focal length of the lens does not define its regional 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 optical lens, 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 on the right side of the cut plane. , its radius of curvature is positive, otherwise, 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 the optical lens provided by 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 concave surface may be located near the optical axis of the lens surface.

In the optical lens disclosed in the present invention, the material of the lens can be plastic, and when the material of the lens is plastic, the production cost can be effectively reduced. 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 total length of the optical lens can be effectively reduced.

In addition, in the optical imaging lens 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 may be a front aperture, that is, the aperture is arranged between the subject and the first lens. The front setting of the aperture can make the exit pupil of the optical lens have a longer distance from the imaging surface, so that it has a telecentric effect, and can increase the efficiency of the CCD or CMOS of the electronic photosensitive element to receive images.

The optical lens 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 optical lens according to the first embodiment. As can be seen from the figure, the optical lens of this embodiment includes an aperture 100, a first lens 110, a second lens 120, a third lens 130, a fourth lens 140, a fifth lens 150, Each of the sixth lens 160 and the seventh lens 170 has an object side facing the object side and an image side facing the image side, and both the object side and the image side of each lens are aspherical. The first lens 110 has a positive refractive power and is made of plastic material. The object side surface 111 is convex at the near optical axis, and the image side surface 112 is concave at the near optical axis. The second lens 120 has a negative refractive power and is made of plastic material. The object side surface 121 is concave at the near optical axis, and the image side surface 122 is concave at the near optical axis. The third lens 130 has a positive refractive power and is made of plastic material. The object side surface 131 is convex at the near optical axis, and the image side surface 132 is concave at the near optical axis. The fourth lens 140 has a positive refractive power and is made of plastic material. The object side 141 is convex at the near optical axis, and there is a change from convex to concave from the near optical axis to the edge. The image side 142 is at the near optical axis. It is concave and there is a change from concave to convex from the near optical axis to the edge. The fifth lens 150 has a positive refractive power and is made of plastic material. The object side surface 151 is convex at the near optical axis, and the image side surface 152 is concave at the near optical axis. The sixth lens 160 has a positive refractive power and is made of plastic material. The object side surface 161 is convex at the near optical axis, and the image side surface 162 is convex at the near optical axis. The seventh lens 170 has a negative refractive power and is made of plastic material. The object side 171 is concave at the near optical axis, and there is a change from concave to convex from the near optical axis to the edge, and the image side 172 is at the near optical axis. It is concave and there is a change from concave to convex from the near optical axis to the edge. In addition, the optical imaging lens 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 optical 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.

Table 6 shows the values that satisfy the conditional expression of the optical lens of this embodiment. 16 , 17 and 18 , the vertical distance Yc ₂₂ from the inflection point 1221 on the image side of the second lens 120 to the optical axis and the effective radius SD ₂₂ on the image side of the second lens 120 are shown in FIG. 16 . The vertical distance _{Yc 32} from the inflection point 1321 on the image side of the third lens 130 to the optical axis is shown with reference to FIG.

The detailed optical data of Example 1 are shown in Table 1-1. The units of curvature radius, thickness and focal length are millimeters, f is the focal length of the optical imaging lens, 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 aperture 100, the object side 111 of the first lens, the image side 112 of the first lens, the object side 121 of the second lens, the image side 122 of the second lens, the object side 131 of the third lens, and the image side of the third lens. 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

Each lens in this optical lens 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, and Y represents the point on the aspheric curve that is perpendicular to the optical axis distance, k is the conic coefficient, and 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 optical lens 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, 0.555 μm μm, 0.610 μm and 0.650 μm. The data in the tables of the following embodiments are the schematic diagrams of the optical lens structure, distortion field curvature and spherical aberration curves corresponding to the respective embodiments. The same, and will not be repeated in the following.

Table 1-2

[Example 2]

Please refer to FIG. 4 , which shows a schematic structural diagram of the optical lens of the second embodiment. As can be seen from the figure, the optical lens of this embodiment includes an aperture 200, a first lens 210, a second lens 220, a third lens 230, a fourth lens 240, a fifth lens 250, Each of the sixth lens 260 and the seventh lens 270 has an object side surface facing the object side and an image side surface facing the image side, and both the object side surface and the image side surface of each lens are aspherical. The first lens 210 has a positive refractive power and is made of plastic material. The object side surface 211 is convex at the near optical axis, and the image side surface 212 is concave at the near optical axis. The second lens 220 has a negative refractive power and is made of plastic material. The object side surface 221 is concave at the near optical axis, and the image side surface 222 is concave at the near optical axis. The third lens 230 has a positive refractive power and is made of plastic material. The object side surface 231 is convex 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 and is made of plastic material. The object side surface 241 is convex at the near optical axis, and there is a change from the convex surface to the concave surface from the near optical axis to the edge. The image side surface 242 is at the near optical axis. It is concave and there is a change from concave to convex from the near optical axis to the edge. The fifth lens 250 has a positive refractive power and is made of plastic material. The object side surface 251 is convex at the near optical axis, and the image side surface 252 is concave at the near optical axis. The sixth lens 260 has a positive refractive power and is made of plastic material. 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 a negative refractive power and is made of plastic material. The object side surface 271 is concave at the near optical axis, and there is a change from concave to convex from the near optical axis to the edge. The image side surface 272 is at the near optical axis. It is concave and there is a change from concave to convex from the near optical axis to the edge. In addition, the optical imaging lens 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 optical lens group, so as to prevent the infrared light from irradiating Noise is generated on the photosensitive 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 6 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 optical lens according to the third embodiment. As can be seen from the figure, the optical lens of this embodiment includes an aperture 300, a first lens 310, a second lens 320, a third lens 330, a fourth lens 340, a fifth lens 350, Each of the sixth lens 360 and the seventh lens 370 has an object side surface facing the object side and an image side surface facing the image side, and the object side surface and the image side surface of each lens are aspherical. The first lens 310 has a positive refractive power and is made of plastic material. 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 negative refractive power and is made of plastic material. The object side surface 321 is convex at the near optical axis, and the image side surface 322 is concave at the near optical axis. The third lens 330 has a positive refractive power and is made of plastic material. The object side surface 331 is convex at the near optical axis, and the image side surface 332 is concave at the near optical axis. The fourth lens 340 has a negative refractive power and is made of plastic material. The object side surface 341 is convex at the near optical axis, and there is a change from the convex surface to the concave surface from the near optical axis to the edge. The image side surface 342 is at the near optical axis. It is concave and there is a change from concave to convex from the near optical axis to the edge. The fifth lens 350 has a positive refractive power and is made of plastic material. The object side surface 351 is convex at the near optical axis, and the image side surface 352 is concave at the near optical axis. The sixth lens 360 has a positive refractive power and is made of plastic material. The object side surface 361 is convex at the near optical axis, and the image side surface 362 is convex at the near optical axis. The seventh lens 370 has a negative refractive power and is made of plastic material. The object side surface 371 is concave at the near optical axis and there is a change from concave to convex from the near optical axis to the edge, and the image side surface 372 is at the near optical axis. It is concave and there is a change from concave to convex from the near optical axis to the edge. In addition, the optical imaging lens 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 optical lens group, so as to prevent the infrared light from irradiating Noise is generated on the photosensitive 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 6 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 optical lens of the fourth embodiment. As can be seen from the figure, the optical lens of this embodiment includes an aperture 400, a first lens 410, a second lens 420, a third lens 430, a fourth lens 440, a fifth lens 450, Each of the sixth lens 460 and the seventh lens 470 has an object side surface facing the object side and an image side surface facing the image side, and both the object side surface and the image side surface of each lens are aspherical. The first lens 410 has a positive refractive power and is made of plastic material. The object side surface 411 is convex at the near optical axis, and the image side surface 412 is concave at the near optical axis. The second lens 420 has a negative refractive power and is made of plastic material. The object side surface 421 is convex at the near optical axis, and the image side surface 422 is concave at the near optical axis. The third lens 430 has a positive refractive power and is made of plastic material. The object side surface 431 is convex at the near optical axis, and the image side surface 432 is concave at the near optical axis. The fourth lens 440 has a positive refractive power and is made of plastic material, and its object side surface 441 is convex at the near optical axis, and there is a change from convex to concave from the near optical axis to the edge, and its image side surface 442 is at the near optical axis. It is concave and there is a change from concave to convex from the near optical axis to the edge. The fifth lens 450 has a positive refractive power and is made of plastic material. The object side surface 451 is convex at the near optical axis, and the image side surface 452 is concave at the near optical axis. The sixth lens 460 has a positive refractive power and is made of plastic material. The object side surface 461 is convex at the near optical axis, and the image side surface 462 is convex at the near optical axis. The seventh lens 470 has a negative refractive power and is made of plastic material. The object side surface 471 is concave at the near optical axis, and there is a change from concave to convex from the near optical axis to the edge, and the image side surface 472 is at the near optical axis. It is concave and there is a change from concave to convex from the near optical axis to the edge. In addition, the optical imaging lens 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 optical lens group, so as to prevent the infrared light from irradiating Noise is generated on the photosensitive 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 6 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 optical lens of the fifth embodiment. As can be seen from the figure, the optical lens of this embodiment includes an aperture 500, a first lens 510, a second lens 520, a third lens 530, a fourth lens 540, a fifth lens 550, Each of the sixth lens 560 and the seventh lens 570 has an object side surface facing the object side and an image side surface facing the image side, and both the object side surface and the image side surface of each lens are aspherical. The first lens 510 has a positive refractive power and is made of plastic material. The object side surface 511 is convex at the near optical axis, and the image side surface 512 is concave at the near optical axis. The second lens 520 has a negative refractive power and is made of plastic material. The object side surface 521 is concave at the near optical axis, and the image side surface 522 is concave at the near optical axis. The third lens 530 has a positive refractive power and is made of plastic material. The object side surface 531 is convex at the near optical axis, and the image side surface 532 is concave at the near optical axis. The fourth lens 540 has a positive refractive power and is made of plastic material. The object side surface 541 is convex at the near optical axis, and there is a change from the convex surface to the concave surface from the near optical axis to the edge. The image side surface 542 is at the near optical axis. It is concave and there is a change from concave to convex from the near optical axis to the edge. The fifth lens 550 has a positive refractive power and is made of plastic material. The object side surface 551 is convex at the near optical axis, and the image side surface 552 is concave at the near optical axis. The sixth lens 560 has a positive refractive power and is made of plastic material. The object side surface 561 is convex at the near optical axis, and the image side surface 562 is convex at the near optical axis. The seventh lens 570 has a negative refractive power and is made of plastic material. The object side 571 is concave at the near optical axis and there is a change from concave to convex from the near optical axis to the edge, and the image side 572 is at the near optical axis. It is concave and there is a change from concave to convex from the near optical axis to the edge. In addition, the optical imaging lens 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 optical lens group, so as to prevent the infrared light from irradiating Noise is generated on the photosensitive 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 6 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

In conclusion, Examples 1 to 5 satisfy the relationships shown in Table 6, respectively.

Table 6

conditional Example 1 Example 2 Example 3 Example 4 Example 5 Yc₂₂/SD₂₂ 0.46 0.54 0.96 0.73 0.66 Yc₃₂/Yc₄₂ 0.64 0.59 0.79 0.79 0.65 f/R₇₂ 1.36 1.29 1.50 1.69 1.41 (R₆₁+R₆₂)/(R₆₁-R₆₂) -0.59 -0.99 0.30 -0.43 -0.60 BL/TL 0.17 0.15 0.15 0.22 0.15 f/f₃ 0.47 0.50 0.53 0.57 0.30 CT₆/ET₆ 0.75 0.60 1.37 0.91 0.63 (CT₆+CT₇)/T₆₇ 1.99 1.77 2.96 3.41 2.15

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

In the electronic equipment provided in this embodiment, the optical lens used in the imaging device is a seven-piece lens structure, and each lens adopts a reasonable surface structure and an optimized range combination of the optical parameters of each lens, which can have excellent optical characteristics and obtain Good imaging quality. The coma, distortion and chromatic aberration of the imaging lens can be effectively corrected by optimizing the surface shape of the image side surface of the second lens, thereby effectively improving the imaging quality. The optical lens of the electronic device in this embodiment has the characteristics of large aperture, high pixel, high resolution, etc., and can have excellent optical characteristics, provide good imaging quality, and meet application requirements.

The optical lens 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 (10)

1. a kind of optical lens, which is characterized in that by object side to image side sequentially include the first lens, the second lens, the third lens, 4th lens, the 5th lens, the 6th lens and the 7th lens, each lens have towards the object side of object space and towards image space Image side surface, the object side of each lens and image side surface are aspherical, in which:

First lens and the third lens all have positive refracting power, and the 7th lens have a negative refracting power, and described the One lens object side is convex surface at dipped beam axis, and the third lens object side is convex surface, the 4th lens at dipped beam axis Object side is convex surface at dipped beam axis, and image side surface is concave surface at dipped beam axis；

And it satisfies the following conditional expression:

0.2<Yc₂₂/SD₂₂<1.0；

Wherein, Yc₂₂Indicate vertical range of the point of inflexion on the second lens image side surface to optical axis, SD₂₂Indicate described second The effective radius of lens image side surface.

2. optical lens according to claim 1, which is characterized in that the 6th lens have positive refracting power, object side Face is convex surface at dipped beam axis, and image side surface is convex surface at dipped beam axis.

3. optical lens according to claim 1, which is characterized in that also satisfy the following conditional expression: 0.5≤Yc₃₂/Yc₄₂≤ 1.5, wherein Yc₃₂Indicate vertical range of the point of inflexion on the third lens image side surface to optical axis, Yc₄₂Indicate the described 4th The vertical range of the point of inflexion on lens image side surface to optical axis.

4. optical lens according to claim 1, which is characterized in that also satisfy the following conditional expression: 0 < f/R₇₂< 5, wherein f Indicate the focal length of the optical lens, R₇₂Indicate the radius of curvature of the 7th lens image side surface.

5. optical lens according to claim 1, which is characterized in that also satisfy the following conditional expression: -2 < (R₆₁+R₆₂)/ (R₆₁-R₆₂) < 2, wherein R₆₁Indicate the radius of curvature of the 6th lens object side, R₆₂Indicate the 6th lens image side surface Radius of curvature.

6. optical lens according to claim 1, which is characterized in that also satisfy the following conditional expression: 0.13≤BL/TL≤ 0.3, wherein BL indicates the 7th lens image side surface to imaging surface in the distance on optical axis, TL expression the first lens object side Face is to imaging surface in the distance on optical axis.

7. optical lens according to claim 1, which is characterized in that also satisfy the following conditional expression: 0.3≤f/f₃≤0.6, Wherein f indicates the focal length of the optical lens, f₃Indicate the focal length of the third lens.

8. optical lens according to claim 1, which is characterized in that also satisfy the following conditional expression: 0.5 < CT₆/ET₆< 1.5, Wherein CT₆Indicate the 6th lens in the thickness on optical axis, ET₆Indicate the edge thickness of the 6th lens.

9. optical lens according to claim 1, which is characterized in that also satisfy the following conditional expression: 1.5 < (CT₆+CT₇)/T₆₇ < 3.5, wherein CT₆Indicate the 6th lens in the thickness on optical axis, CT₇Indicate the 7th lens in the thickness on optical axis, T₆₇Indicate the 6th lens image side surface to the 7th lens object side in the distance on optical axis.

10. a kind of electronic equipment, which is characterized in that including photographic device, the photographic device includes electronics photosensitive element and power Benefit requires the described in any item optical lens of 1-9, and the electronics photosensitive element is set to the imaging surface of the optical lens.