CN110187473B - Five-piece type wide-angle lens and electronic equipment - Google Patents

Abstract

The invention discloses a five-piece wide-angle lens, the first lens element with negative refractive power has a convex object-side surface at the paraxial region, the image-side surface of the second lens element with positive refractive power is concave at paraxial region, the object-side surface of the second lens element with positive refractive power is convex at paraxial region, the image-side surface is convex at a paraxial region, the third lens element with negative refractive power has a concave object-side surface at a paraxial region, the image-side surface of the fourth lens element with positive refractive power is concave at paraxial region, the object-side surface of the fourth lens element with negative refractive power is concave at paraxial region, the image-side surface of the fifth lens element with negative refractive power is convex at paraxial region, the object-side surface of the fifth lens element with negative refractive power is convex at paraxial region, the image side surface of the lens is a concave surface at the position near the optical axis, and the ratio of the air distance between the first lens and the second lens on the optical axis to the central thickness of the first lens is reasonably configured, so that the lens is light, thin, short and small, and has a large field angle and excellent imaging quality. The invention also discloses an electronic device.

Description

A five-piece wide-angle lens and electronic equipment

technical field

The invention relates to the technical field of optical imaging devices, in particular to a five-piece wide-angle lens. The invention also relates to an electronic device.

Background technique

With the rapid development of electronic technology, mobile and lightweight electronic devices have been rapidly popularized, such as smart phones, tablet computers, driving recorders and action cameras, etc., which has also promoted the vigorous development of camera module-related technologies applied to electronic devices. develop. With the advancement of semiconductor manufacturing process technology, the pixel size of photosensitive devices has been reduced. Correspondingly, the camera lens has gradually developed into the field of high pixels, and the requirements for its imaging quality have been continuously improved. In some specific scenes, the camera module is also required to have a larger field of view, such as front-facing selfies, game consoles, panoramic cameras, etc. A large wide-angle can make the captured scene wider. Therefore, it is an urgent need in the current field to provide a miniaturized, large-field-of-view camera lens with excellent imaging quality.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a five-piece wide-angle lens, which is light, thin and short, can correct aberrations well, has high pixels, high resolution, large field of view and excellent imaging quality, and can meet application requirements. The present invention also provides an electronic device.

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

A five-piece wide-angle lens, comprising a first lens, a second lens, a third lens, a fourth lens and a fifth lens in sequence from the object side to the image side, and each lens has an object side facing the object side and an object side facing the image side. The image side surface, wherein: the first lens has negative refractive power, its object side is convex at the near optical axis, its image side is concave at the near optical axis, the second lens has positive refractive power, and its object side is concave. The side is convex at the near optical axis, the image side is convex at the near optical axis, the third lens has a negative refractive power, the object side is concave at the near optical axis, and its image side is at the near optical axis. Concave, the fourth lens has a positive refractive power, its object side is concave at the near optical axis, and its image side is convex at the near optical axis, the fifth lens has a negative refractive power, and its object side is at the near beam. The axis is a convex surface, and its image side is concave at the near optical axis, and also includes a diaphragm arranged between the first lens and the second lens; and the following conditional formula is satisfied:

0.9＜T ₁₂ /CT ₁ ≤1.3;

0.5< _SAG11 / _ET1 <0.9;

Wherein, T ₁₂ represents the distance from the image side of the first lens to the object side of the second lens on the optical axis, CT ₁ represents the thickness of the first lens on the optical axis, and SAG ₁₁ represents the first lens The horizontal displacement distance from the intersection of the object side surface and the optical axis to the position of the maximum effective radius of the object side surface of the first lens on the optical axis, ET ₁ represents the edge thickness of the first lens.

Preferably, the following conditional formula is also satisfied: FOV≧120°, where FOV represents the maximum angle of view of the five-piece wide-angle lens.

Preferably, the following conditional formula is also satisfied: V ₁ −V ₅ >20, where V ₁ represents the dispersion coefficient of the first lens, and V ₅ represents the dispersion coefficient of the fifth lens.

Preferably, the following conditional formula is also satisfied: 0.7<SAG ₄₁ +CT ₄ <1.4, wherein SAG ₄₁ represents the intersection of the object side of the fourth lens and the optical axis to the maximum effective radius of the object side of the fourth lens. The horizontal displacement distance on the axis, CT ₄ represents the thickness of the fourth lens on the optical axis.

Preferably, the following conditional formula is also satisfied: 0.3<Yc ₅₂ /ImgH<0.6, wherein Yc ₅₂ represents the vertical distance from the inflection point on the image side of the fifth lens to the optical axis, and ImgH represents the diagonal angle of the effective pixel area on the imaging surface half the length of the line.

Preferably, the following conditional formula is also satisfied: 0<(R ₂₁ +R ₂₂ )/(R ₂₁ -R ₂₂ )<1, where R ₂₁ represents the radius of curvature of the object side surface of the second lens, and R ₂₂ represents the The radius of curvature of the image side of the second lens.

Preferably, the following conditional formula is also satisfied: 1.5<(T ₁₂ +T ₄₅ )/CT ₃ <3, 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, T ₄₅ represents the air distance from the image side of the fourth lens to the object side of the fifth lens on the optical axis, and CT ₃ represents the thickness of the third lens on the optical axis.

Preferably, the following conditional formula is also satisfied: 0.9≦f/f ₂ ≦1.3, where f represents the focal length of the five-piece wide-angle lens, and f ₂ represents the focal length of the second lens.

Preferably, the following conditional formula is also satisfied: -2.6<f ₁ /f ₂ <-1.7, f ₁ represents the focal length of the first lens, and f ₂ represents the focal length of the second lens.

An electronic device includes a camera device, the camera device includes an electronic photosensitive element and the above-mentioned five-piece wide-angle lens, and the electronic light-sensitive element is arranged on the imaging surface of the five-piece wide-angle lens.

It can be seen from the above technical solutions that the five-piece wide-angle lens provided by the present invention includes a first lens, a second lens, a third lens, a fourth lens and a fifth lens arranged in sequence from the object side to the image side. After passing through each lens, the image is formed on the imaging surface on the image side of the fifth lens. The five-piece wide-angle lens is conducive to the miniaturization of the lens and the enlargement of the field of view by reasonably configuring the ratio of the air distance between the first lens and the second lens on the optical axis to the central thickness of the first lens, and by controlling the object of the first lens The shape of the side surface makes the shape of the object side surface of the first lens relatively gentle, which is beneficial to the molding and position arrangement of the first lens. The five-piece wide-angle lens provided by the invention is light, thin and short, can correct aberrations well, has high pixels, high resolution, large field of view and excellent imaging quality, and can 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 a five-piece wide-angle lens provided in Embodiment 1 of the present invention;

Figure 2 (a) and Figure 2 (b) are respectively the astigmatism curve diagram and the distortion curve diagram of the five-piece wide-angle lens in Embodiment 1 of the present invention;

3 is a spherical aberration curve diagram of a five-piece wide-angle lens in Embodiment 1 of the present invention;

4 is a schematic diagram of a five-piece wide-angle lens provided in Embodiment 2 of the present invention;

Figure 5 (a) and Figure 5 (b) are respectively the astigmatism curve diagram and the distortion curve diagram of the five-piece wide-angle lens in the second embodiment of the present invention;

6 is a spherical aberration curve diagram of a five-piece wide-angle lens in Embodiment 2 of the present invention;

7 is a schematic diagram of a five-piece wide-angle lens provided in Embodiment 3 of the present invention;

Figure 8 (a) and Figure 8 (b) are respectively the astigmatism curve diagram and the distortion curve diagram of the five-piece wide-angle lens in Embodiment 3 of the present invention;

9 is a spherical aberration curve diagram of a five-piece wide-angle lens in Embodiment 3 of the present invention;

10 is a schematic diagram of a five-piece wide-angle lens provided in Embodiment 4 of the present invention;

Figure 11 (a) and Figure 11 (b) are respectively the astigmatism curve diagram and the distortion curve diagram of the five-piece wide-angle lens in Embodiment 4 of the present invention;

12 is a spherical aberration curve diagram of a five-piece wide-angle lens in Embodiment 4 of the present invention;

13 is a schematic diagram of a five-piece wide-angle lens provided in Embodiment 5 of the present invention;

14(a) and FIG. 14(b) are respectively the astigmatism curve diagram and the distortion curve diagram of the five-piece wide-angle lens in Embodiment 5 of the present invention;

15 is a spherical aberration curve diagram of a five-piece wide-angle lens in Embodiment 5 of the present invention;

16 is a schematic diagram of a five-piece wide-angle lens provided in Embodiment 6 of the present invention;

17(a) and FIG. 17(b) are respectively the astigmatism curve diagram and the distortion curve diagram of the five-piece wide-angle lens in Embodiment 6 of the present invention;

18 is a spherical aberration curve diagram of a five-piece wide-angle lens in Embodiment 6 of the present invention;

19 is a schematic diagram of the SAG ₁₁ in the five-piece wide-angle lens according to Embodiment 1 of the present invention;

20 is a schematic diagram of the SAG ₄₁ in the five-piece wide-angle lens according to Embodiment 1 of the present invention;

FIG. 21 is a schematic diagram of Yc ₅₂ in the five-piece wide-angle 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 a five-piece wide-angle lens, which includes a first lens, a second lens, a third lens, a fourth lens and a fifth lens in sequence from the object side to the image side, and each lens has an object side facing the object side and towards the side of the image. It also includes an imaging surface on the side of the fifth lens facing the image side, and a filter set between the fifth lens and the imaging surface, the filter does not affect the focal length of the five-piece wide-angle lens.

The first lens has a negative refractive power, its object side surface is convex at the near optical axis, and its image side surface can be concave at the near optical axis, which helps to expand the angle of view and control the total length of the lens to effectively maintain the Lens miniaturization.

The second lens has a positive refractive power, and both the object side and the image side are convex, which helps to concentrate the ability of the lens to focus light on the second lens, thereby increasing the range of light entering the lens and expanding the field of view.

The third lens has a negative refractive power, which is helpful for aberration correction of the lens. The object side of the third lens can be concave at the near optical axis, and its image side can be concave at the near optical axis, so that the principal point of the lens can be further away from the imaging surface, which is beneficial to shorten the overall length of the lens and maintain the small size of the lens change.

The fourth lens has a positive refractive power, the object side can be concave at the near optical axis, and the object side can be changed from concave to convex from the near optical axis to the edge, and the image side of the fourth lens can be Convex, which helps to reduce lens sensitivity and correct astigmatism to improve image quality.

The fifth lens has a negative refractive power, and its object side surface is convex at the near-optical axis, which can correct off-axis aberrations, improve the peripheral illumination of the image, and avoid vignetting. The image side of the fifth lens is concave at the near optical axis, and the image side has at least one inflection point, which helps to keep the principal point of the lens away from the image side, thereby effectively shortening the length of the five-piece wide-angle lens. The overall length is conducive to the miniaturization of the five-piece wide-angle lens, and can further correct the off-axis aberration to improve the surrounding imaging quality.

The five-piece wide-angle lens satisfies 0.9<T ₁₂ /CT ₁ ≤1.3 by reasonably configuring the ratio of the air distance between the first lens and the second lens on the optical axis to the central thickness of the first lens, where T ₁₂ indicates that the first lens The distance between the mirror side surface and the object side surface of the second lens on the optical axis, CT ₁ represents the thickness of the first lens on the optical axis, which is beneficial to the miniaturization of the lens and the expansion of the field of view. And by controlling the shape of the object side of the first lens to satisfy 0.5<SAG ₁₁ /ET ₁ <0.9, SAG ₁₁ represents the intersection of the object side of the first lens and the optical axis to the maximum effective radius position of the object side of the first lens The horizontal displacement distance on the optical axis, ET ₁ represents the edge thickness of the first lens, so that the shape of the object side surface of the first lens is relatively gentle, which is conducive to the molding and position arrangement of the first lens, and improves the production yield. The five-piece wide-angle lens of the invention is light, thin and short, can correct aberrations well, has high pixels, high resolution, large field of view and excellent imaging quality, and can meet application requirements.

Preferably, the five-piece wide-angle lens also satisfies the following conditional formula: FOV≥120°, where FOV represents the maximum field of view of the five-piece wide-angle lens. Satisfying this condition provides a large field of view to obtain the proper imaging range required. It is better to satisfy FOV≥125°.

Preferably, the five-piece wide-angle lens also satisfies the following conditional formula: V ₁ −V ₅ >20, where V ₁ represents the dispersion coefficient of the first lens, and V ₅ represents the dispersion coefficient of the fifth lens. By selecting a material that satisfies this conditional expression to make the first lens closest to the object side and the fifth lens closest to the image side, the resolution of the optical lens can be improved and the chromatic aberration of the lens can be well corrected.

Preferably, the five-piece wide-angle lens also satisfies the following conditional formula: 0.7<SAG ₄₁ +CT ₄ <1.4, where SAG ₄₁ represents the intersection of the object side of the fourth lens and the optical axis to the maximum of the object side of the fourth lens The horizontal displacement distance of the effective radius position on the optical axis, CT ₄ represents the thickness of the fourth lens on the optical axis. Appropriate configuration of the shape of the object side surface of the fourth lens and the thickness of the fourth lens facilitates manufacturing and assembly.

Preferably, the five-piece wide-angle lens also satisfies the following conditional formula: 0.3<Yc ₅₂ /ImgH<0.6, wherein Yc ₅₂ represents the vertical distance from the inflection point on the image side of the fifth lens to the optical axis, and ImgH represents the imaging plane Half the diagonal length of the effective pixel area. Satisfying this condition is conducive to correcting the incident angle of the chief ray on the image plane, improving the matching with the photosensitive chip, and ensuring that the brightness of the entire image plane is uniform.

Preferably, the five-piece wide-angle lens also satisfies the following conditional formula: 0<(R ₂₁ +R ₂₂ )/(R ₂₁ -R ₂₂ )<1, where R ₂₁ represents the radius of curvature of the object side of the second lens, and R ₂₂ represents the curvature radius of the image side surface of the second lens. By reasonably configuring the curvature radii of the object side surface and the image side surface of the second lens, the shape of the second lens is more suitable, which is helpful to correct the spherical aberration of the optical camera lens and improve the imaging quality.

Preferably, the five-piece wide-angle lens also satisfies the following conditional formula: 1.5<(T ₁₂ +T ₄₅ )/CT ₃ <3, where T ₁₂ indicates that the image side of the first lens to the object side of the second lens is in the light The distance on the axis, T ₄₅ represents the air distance from the image side of the fourth lens to the object side of the fifth lens on the optical axis, and CT ₃ represents the thickness of the third lens on the optical axis. Satisfying this condition makes the sensitivity of the lens more suitable, which helps to improve the manufacturing yield of the lens assembly.

Preferably, the five-piece wide-angle lens also satisfies the following conditional formula: 0.9≦f/f ₂ ≦1.3, where f represents the focal length of the five-piece wide-angle lens, and f ₂ represents the focal length of the second lens. By reasonably distributing the ratio of the total effective focal length of the lens to the effective focal length of the second lens, the optical power can be effectively distributed and the sensitivity of the lens can be reduced.

Preferably, the five-piece wide-angle lens also satisfies the following conditional formula: -2.6<f ₁ /f ₂ <-1.7, f ₁ represents the focal length of the first lens, and f ₂ represents the focal length of the second lens. In this way, the configuration of the refractive power of the first lens and the second lens is more suitable, which is beneficial to obtain a wide field of view and reduce lens aberrations. The first lens and the second lens form a negative and one positive telephoto structure, which can effectively reduce the total optical length of the lens.

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 five-piece wide-angle lens of 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 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, whereas 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, near the optical axis refers to a region near the optical axis. In the five-piece wide-angle lens 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 lens surface 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 five-piece wide-angle lens disclosed in the present invention, the lens is made of materials with high light transmittance and excellent machinability. For example, using plastic to make the lens is conducive to the production and molding of the lens, so as to improve the manufacturing yield, and it is also beneficial to reduce manufacturing 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, It can effectively reduce the overall length of the camera lens. In addition, any two adjacent lenses of the five-piece wide-angle lens can have a space between them, which is beneficial to the assembly of the lenses and improves the manufacturing yield.

In addition, in the five-piece wide-angle 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 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 has the advantages of a wide-angle lens. In the present invention, the aperture is set between the first lens and the second lens.

The five-piece wide-angle 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]

Referring to FIG. 1 , a schematic structural diagram of the five-piece wide-angle lens of Embodiment 1 is shown. As can be seen from the figure, the five-piece wide-angle lens in this embodiment includes a first lens 11, an aperture 10, a second lens 12, a third lens 13, a fourth lens 14 and a fifth lens that are arranged in sequence from the object side to the image side along the optical axis 15. Each lens 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 surfaces. The first lens 11 has a negative refractive power and is made of plastic material. The object side surface is convex at the near optical axis, and the image side surface is concave at the near optical axis. The second lens 12 has a positive refractive power and is made of plastic material. The object side surface is convex at the near optical axis, and the image side surface is convex at the near optical axis. The third lens 13 has a negative refractive power and is made of plastic material. The object side surface is concave at the near optical axis, and the image side surface is concave at the near optical axis. The fourth lens 14 has a positive refractive power and is made of plastic material. The object side surface is concave at the near optical axis, and the image side surface is convex at the near optical axis. The fifth lens 15 has negative refractive power and is made of plastic material. The object side surface is convex at the near optical axis, the image side surface is concave at the near optical axis, and the image side surface has at least one inflection point. In addition, the five-piece wide-angle lens further includes an infrared filter 16 placed between the fifth lens 15 and the imaging surface 17, and the infrared filter 16 filters out the infrared band light entering the lens to prevent the infrared light from irradiating the photosensitive chip. produce noise. The optional filter material is glass and does not affect the focal length.

Table 7 shows the values that satisfy the conditional expression of the five-piece wide-angle lens in this embodiment. Please refer to FIGS. 19 , 20 and 21 , the horizontal displacement distance SAG ₁₁ on the optical axis from the intersection of the object side surface of the first lens 11 and the optical axis to the position of the maximum effective radius of the object side surface of the first lens 11 on the optical axis is shown in FIG. 19 . shown, the horizontal displacement distance SAG ₄₁ on the optical axis from the intersection of the object side of the fourth lens 14 and the optical axis to the maximum effective radius position of the object side of the fourth lens is shown in FIG. The vertical distance Yc ₅₂ from 1521 to the optical axis is shown in FIG. 21 .

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 five-piece wide-angle lens, Fno is the aperture value, FOV is the maximum field of view, and the surface 0 -14 represents the surfaces from the object side to the image side in order. Surfaces 1-11 represent the object side of the first lens, the image side of the first lens, the aperture, the object side of the second lens, the image side of the second lens, the object side of the third lens, the image side of the third lens, and the object side of the fourth lens. , the image side of the fourth lens, the object side of the fifth lens, and the image side of the fifth lens.

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 five-piece wide-angle 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; 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 the lenses in this embodiment are shown in Table 1-2, k is the conic coefficient in the aspheric curve equation, and A4-A20 are the 4th-20th order aspheric coefficients of the lens surface, respectively. The astigmatism curve, distortion curve and spherical aberration curve of the five-piece wide-angle lens of this embodiment are shown in Fig. 2(a), Fig. 2(b) and Fig. 3, respectively, in which the astigmatism curve and distortion curve are shown in Fig. The wavelength is 0.555 μm, and the wavelengths in the spherical aberration curve are 0.470 μm, 0.510 μm, 0.555 μm, 0.610 μm and 0.650 μm. In addition, the following tables of the embodiments are the structural schematic diagram, astigmatism curve, distortion curve and spherical aberration curve diagram of the five-piece wide-angle lens corresponding to each embodiment. It is the same as the definition in Table 1-2, and will not be repeated below.

Table 1-2

[Example 2]

Referring to FIG. 4 , a schematic structural diagram of the five-piece wide-angle lens of Embodiment 2 is shown. As can be seen from the figure, the five-piece wide-angle lens of this embodiment includes a first lens 21, an aperture 20, a second lens 22, a third lens 23, a fourth lens 24 and a fifth lens which are arranged in sequence from the object side to the image side along the optical axis 25. Each lens 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 surfaces. The first lens 21 has a negative refractive power and is made of plastic material. The object side surface is convex at the near optical axis, and the image side surface is concave at the near optical axis. The second lens 22 has a positive refractive power and is made of plastic material. The object side surface is convex at the near optical axis, and the image side surface is convex at the near optical axis. The third lens 23 has a negative refractive power and is made of plastic material. The object side surface is concave at the near optical axis, and the image side surface is concave at the near optical axis. The fourth lens 24 has a positive refractive power and is made of plastic material. The object side surface is concave at the near optical axis, and the image side surface is convex at the near optical axis. The fifth lens 25 has negative refractive power and is made of plastic material. The object side surface is convex at the near optical axis, the image side surface is concave at the near optical axis, and the image side surface has at least one inflection point. In addition, the five-piece wide-angle lens further includes an infrared filter 26 placed between the fifth lens 25 and the imaging surface 27, and the infrared filter 26 filters out the infrared wavelength light entering the lens 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 7 below. The corresponding astigmatism curves, distortion curves and spherical aberration curves are shown in Fig. 5(a), Fig. 5(b) and Fig. 6, respectively.

table 2-1

Table 2-2

[Example 3]

Referring to FIG. 7 , a schematic structural diagram of the five-piece wide-angle lens of Embodiment 3 is shown. As can be seen from the figure, the five-piece wide-angle lens of this embodiment includes a first lens 31, an aperture 30, a second lens 32, a third lens 33, a fourth lens 34 and a fifth lens which are arranged in sequence from the object side to the image side along the optical axis 35. Each lens 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 surfaces. The first lens 31 has a negative refractive power and is made of plastic material. The object side surface is convex at the near optical axis, and the image side surface is concave at the near optical axis. The second lens 32 has a positive refractive power and is made of plastic material. The object side surface is convex at the near optical axis, and the image side surface is convex at the near optical axis. The third lens 33 has a negative refractive power and is made of plastic material. The object side surface is concave at the near optical axis, and the image side surface is concave at the near optical axis. The fourth lens 34 has a positive refractive power and is made of plastic material. The object side surface is concave at the near optical axis, and the image side surface is convex at the near optical axis. The fifth lens 35 has negative refractive power and is made of plastic material. The object side surface is convex at the near optical axis, the image side surface is concave at the near optical axis, and the image side surface has at least one inflection point. In addition, the five-piece wide-angle lens further includes an infrared filter 36 placed between the fifth lens 35 and the imaging surface 37, and the infrared filter 36 filters out the infrared wavelength light entering the optical lens group to avoid infrared light irradiation produce noise 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 7 below. The corresponding astigmatism curves, distortion curves and spherical aberration curves are shown in Fig. 8(a), Fig. 8(b) and Fig. 9, respectively.

Table 3-1

Table 3-2

[Example 4]

Referring to FIG. 10 , a schematic structural diagram of the five-piece wide-angle lens of Embodiment 4 is shown. As can be seen from the figure, the five-piece wide-angle lens of this embodiment includes a first lens 41, an aperture 40, a second lens 42, a third lens 43, a fourth lens 44 and a fifth lens which are arranged in sequence from the object side to the image side along the optical axis 45. Each lens 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 surfaces. The first lens 41 has a negative refractive power and is made of plastic material. The object side surface is convex at the near optical axis, and the image side surface is concave at the near optical axis. The second lens 42 has a positive refractive power and is made of plastic material. The object side surface is convex at the near optical axis, and the image side surface is convex at the near optical axis. The third lens 43 has a negative refractive power and is made of plastic material. The object side surface is concave at the near optical axis, and the image side surface is concave at the near optical axis. The fourth lens 44 has a positive refractive power and is made of plastic material. The object side surface is concave at the near optical axis, and the image side surface is convex at the near optical axis. The fifth lens 45 has negative refractive power and is made of plastic material. The object side is convex at the near optical axis, the image side is concave at the near optical axis, and the image side has at least one inflection point. In addition, the five-piece wide-angle lens further includes an infrared filter 46 placed between the fifth lens 45 and the imaging surface 47, and the infrared filter 46 filters out the infrared wavelength light entering the lens 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 7 below. The corresponding astigmatism graph, distortion graph and spherical aberration graph are shown in Fig. 11(a), Fig. 11(b) and Fig. 12, respectively.

Table 4-1

Table 4-2

[Example 5]

Please refer to FIG. 13 , which shows a schematic structural diagram of the five-piece wide-angle lens of the fifth embodiment. As can be seen from the figure, the five-piece wide-angle lens of this embodiment includes a first lens 51, an aperture 50, a second lens 52, a third lens 53, a fourth lens 54 and a fifth lens that are arranged in sequence from the object side to the image side along the optical axis 55. Each lens 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 51 has a negative refractive power and is made of plastic material. The object side surface is convex at the near optical axis, and the image side surface is concave at the near optical axis. The second lens 52 has a positive refractive power and is made of plastic material. The object side surface is convex at the near optical axis, and the image side surface is convex at the near optical axis. The third lens 53 has a negative refractive power and is made of plastic material. The object side surface is concave at the near optical axis, and the image side surface is concave at the near optical axis. The fourth lens 54 has a positive refractive power and is made of plastic material. The object side surface is concave at the near optical axis, and the image side surface is convex at the near optical axis. The fifth lens 55 has negative refractive power and is made of plastic material. The object side surface is convex at the near optical axis, the image side surface is concave at the near optical axis, and the image side surface has at least one inflection point. In addition, the five-piece wide-angle lens further includes an infrared filter 56, which is placed between the fifth lens 55 and the imaging surface 57. The infrared filter 56 filters out the infrared band light entering the lens, 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 5-1, Table 5-2 and Table 7 below. The corresponding astigmatism graph, distortion graph and spherical aberration graph are shown in Fig. 14(a), Fig. 14(b) and Fig. 15, respectively.

Table 5-1

Table 5-2

[Example 6]

Referring to FIG. 16 , a schematic structural diagram of the five-piece wide-angle lens of Embodiment 6 is shown. It can be seen from the figure that the five-piece wide-angle lens of this embodiment includes a first lens 61, an aperture 60, a second lens 62, a third lens 63, a fourth lens 64 and a fifth lens which are arranged in sequence from the object side to the image side along the optical axis 65. Each lens 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 surfaces. The first lens 61 has a negative refractive power and is made of plastic material. The object side surface is convex at the near optical axis, and the image side surface is concave at the near optical axis. The second lens 62 has a positive refractive power and is made of plastic material. The object side surface is convex at the near optical axis, and the image side surface is convex at the near optical axis. The third lens 63 has a negative refractive power and is made of plastic material. The object side surface is concave at the near optical axis, and the image side surface is concave at the near optical axis. The fourth lens 64 has a positive refractive power and is made of plastic material. The object side surface is concave at the near optical axis, and the image side surface is convex at the near optical axis. The fifth lens 65 has a negative refractive power and is made of plastic material. The object side surface is convex at the near optical axis, the image side surface is concave at the near optical axis, and the image side surface has at least one inflection point. In addition, the five-piece wide-angle lens further includes an infrared filter 66 placed between the fifth lens 65 and the imaging surface 67, and the infrared filter 66 filters out the infrared wavelength light entering the lens 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 7 below. The corresponding astigmatism graph, distortion graph and spherical aberration graph are shown in Fig. 17(a), Fig. 17(b) and Fig. 18, respectively.

Table 6-1

Table 6-2

In conclusion, Examples 1 to 6 satisfy the relationships shown in Table 7, respectively.

Table 7

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 five-piece wide-angle lens, and the electronic light-sensitive element is arranged on the side of the five-piece wide-angle lens. imaging surface.

In the electronic device provided in this embodiment, the five-piece wide-angle lens used in the imaging device can have good imaging quality by adopting a reasonable surface shape of each lens and an optimized range of optical parameters of each lens, wherein the first The ratio of the air distance between the lens and the second lens on the optical axis to the thickness of the center of the first lens, which is beneficial to the miniaturization of the lens and the expansion of the field of view, and the shape of the object side of the first lens can be controlled by controlling the shape of the object side of the first lens. It is relatively flat, which is conducive to the formation and placement of the first lens. The five-piece wide-angle lens used in this electronic device is light, thin and short, and can correct aberrations well. It has high pixels, high resolution, large field of view and excellent imaging quality. able to meet application requirements.

The five-piece wide-angle 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 (7)

1. A five-lens wide-angle lens includes, 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 and a fifth lens element, each having an object-side surface facing an object side and an image-side surface facing an image side, wherein: the first lens element with negative refractive power has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region, the second lens element with positive refractive power has a convex object-side surface at a paraxial region and a convex image-side surface at a paraxial region, the third lens element with negative refractive power has a concave object-side surface at a paraxial region and a concave image-side surface at a paraxial region, the fourth lens element with positive refractive power has a concave object-side surface at a paraxial region and a convex image-side surface at a paraxial region, the fifth lens element with negative refractive power has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region, and the stop is disposed between the first lens element and the second lens element; and satisfies the following conditional expressions:

0.9＜T₁₂/CT₁≤1.3；

0.5<SAG₁₁/ET₁<0.9；

wherein, T₁₂Representing the distance on the optical axis from the image-side surface of the first lens to the object-side surface of the second lens, CT₁Denotes the thickness of the first lens on the optical axis, SAG₁₁Represents the horizontal displacement distance on the optical axis from the intersection point of the object side surface and the optical axis of the first lens to the maximum effective radius position of the object side surface of the first lens, ET₁Representing an edge thickness of the first lens;

0.9≤f/f₂≤1.3，-2.6<f₁/f₂<-1.7, where f denotes the focal length of the five-piece wide-angle lens, f₂Denotes the focal length of the second lens, f₁Denotes the focal length of the first lens, f 1.64 or f 1.48 or f 1.56 or f 1.54;

the FOV is more than or equal to 120 degrees, wherein the FOV represents the maximum field angle of the five-piece wide-angle lens.

2. The five-piece wide-angle lens according to claim 1, further satisfying the following conditional expression: v₁-V₅>20, wherein V₁A dispersion system representing the first lensNumber, V₅Representing the abbe number of the fifth lens.

3. The five-piece wide-angle lens according to claim 1, further satisfying the following conditional expression: 0.7<SAG₄₁+CT₄<1.4, SAG wherein₄₁Representing the horizontal displacement distance on the optical axis from the intersection point of the object-side surface and the optical axis of the fourth lens to the maximum effective radius position of the object-side surface of the fourth lens, CT₄Represents the thickness of the fourth lens on the optical axis.

4. The five-piece wide-angle lens according to claim 1, further satisfying the following conditional expression: 0.3<Yc₅₂/ImgH<0.6 wherein Yc₅₂The vertical distance from the inflection point of the image side surface of the fifth lens to the optical axis is shown, and ImgH represents half of the diagonal length of the effective pixel area on the imaging surface.

5. The five-piece wide-angle lens according to claim 1, further satisfying the following conditional expression: 0<(R₂₁+R₂₂)/(R₂₁-R₂₂)<1, wherein R₂₁Represents a radius of curvature, R, of an object-side surface of the second lens₂₂Representing a radius of curvature of the image side surface of the second lens.

6. The five-piece wide-angle lens according to claim 1, further satisfying the following conditional expression: 1.5<(T₁₂+T₄₅)/CT₃<3, wherein T₁₂Represents the distance between the image side surface of the first lens and the object side surface of the second lens on the optical axis, T₄₅Represents the air space between the image side surface of the fourth lens and the object side surface of the fifth lens on the optical axis, CT₃Represents the thickness of the third lens on the optical axis.

7. An electronic apparatus characterized by comprising an image pickup device including an electronic photosensitive element provided to an imaging surface of a five-piece wide-angle lens according to any one of claims 1 to 6 and the five-piece wide-angle lens.

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