CN110187483B - Wide-angle lens and electronic equipment - Google Patents

Wide-angle lens and electronic equipment Download PDF

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Publication number
CN110187483B
CN110187483B CN201910476917.1A CN201910476917A CN110187483B CN 110187483 B CN110187483 B CN 110187483B CN 201910476917 A CN201910476917 A CN 201910476917A CN 110187483 B CN110187483 B CN 110187483B
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lens
image
wide
lens element
angle
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CN110187483A (en
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林肖怡
章彬炜
刘涵
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Guizhou Xuye Photoelectric Co ltd
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Guizhou Xuye Photoelectric Co ltd
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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
    • G02B1/041—Lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
    • G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
    • G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces

Abstract

The invention discloses a wide-angle lens, wherein a first lens has negative refractive power, an object side surface of the first lens is concave at a paraxial region, a second lens has positive refractive power, both an object side surface and an image side surface of the second lens are convex, a third lens has negative refractive power, a fourth lens has positive refractive power, a fifth lens has negative refractive power, an object side surface of the fifth lens is convex at the paraxial region, a sixth lens has negative refractive power, an image side surface of the sixth lens is concave at the paraxial region and has at least one inflection point on the image side surface. The wide-angle lens is light, thin, short and small, can well correct aberration, and has high pixels, high resolution and excellent imaging quality. The invention also discloses an electronic device.

Description

Wide-angle lens and electronic equipment
Technical Field
The invention relates to the technical field of optical imaging devices, in particular to a wide-angle lens. The invention also relates to an electronic device.
Background
With the rapid development of electronic technologies, portable mobile electronic devices, such as smart phones, tablet computers, automobile data recorders, and motion cameras, have been rapidly popularized, which simultaneously promotes the rapid development of camera module related technologies applied to electronic devices. With the advancement of semiconductor manufacturing technology, the pixel size of the photosensitive device has been reduced, and accordingly, the imaging lens has been gradually developed in the high pixel field, and the requirements for the imaging quality thereof have been increasingly increased. In some specific scenes, a large field angle is also required, such as a self-timer camera, a game machine, a panoramic camera, and the like, and the large wide angle can make the shot scene wider. Therefore, it is an urgent need in the art to provide an imaging lens that is compact, lightweight, thin, has a large field angle, and has excellent imaging quality.
Disclosure of Invention
In view of the above, the present invention provides a wide-angle lens, which is light, thin, short, small, capable of well correcting aberration, has high pixel, high resolution and excellent imaging quality, and can meet application requirements. The invention also provides electronic equipment.
In order to achieve the purpose, the invention provides the following technical scheme:
a wide-angle lens comprises a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element in order from an object side to an image side, wherein each lens element has an object-side surface facing an object side and an image-side surface facing an image side, and the object-side surface and the image-side surface of each lens element are aspheric, wherein: the first lens element with negative refractive power having a concave object-side surface at a paraxial region, the second lens element with positive refractive power having convex object-side and image-side surfaces, the third lens element with negative refractive power, the fourth lens element with positive refractive power, the fifth lens element with negative refractive power having a convex object-side surface at a paraxial region, the sixth lens element with negative refractive power having a concave image-side surface at a paraxial region, and the image-side surface with at least one inflection point; and satisfies the following conditional expressions:
1.1<CT2/ET2<1.8，R11<0，R51>0，V2>50，V3<30；
wherein, CT2Denotes the thickness of the second lens on the optical axis, ET2Denotes the edge thickness, R, of the second lens11Represents a radius of curvature, R, of an object-side surface of the first lens51Represents a radius of curvature, V, of an object-side surface of the fifth lens2Expressing the Abbe number, V, of the second lens3Representing the abbe number of the third lens.
Preferably, the object-side surface of the fourth lens element is concave at paraxial region, and the object-side surface of the fourth lens element changes from concave at paraxial region to convex at peripheral region.
Preferably, the following conditional formula is also satisfied: the FOV is more than or equal to 119 degrees, wherein the FOV represents the maximum field angle of the wide-angle lens.
Preferably, the following conditional formula is also satisfied: 1<(R61+R62)/(R61-R62) Is less than or equal to 5, wherein R is61Represents a radius of curvature, R, of an object-side surface of the sixth lens62Represents a radius of curvature of the image-side surface of the sixth lens element.
Preferably, the following conditional formula is also satisfied: 0.2< BL/f is less than or equal to 0.6, wherein BL represents the distance between the image side surface of the sixth lens and the imaging surface on the optical axis, and f represents the focal length of the wide-angle lens.
Preferably, the following conditional formula is also satisfied: yc is not less than 0.552/Yc62<1.5 wherein Yc52Denotes the vertical distance Yc from the point of inflection of the image-side surface of the fifth lens to the optical axis62And the vertical distance from the inflection point of the image side surface of the sixth lens to the optical axis is shown.
Preferably, the following conditional formula is also satisfied: SAG of 0.4 ≤32/CT3<1.1, wherein SAG32Representing the horizontal displacement distance on the optical axis from the intersection point of the image side surface of the third lens and the optical axis to the maximum effective radius position of the image side surface of the third lens, CT3Represents the thickness of the third lens on the optical axis.
Preferably, the following conditional formula is also satisfied: i f/f1|<1, where f denotes the focal length of the wide-angle lens, f1Representing the focal length of the first lens.
Preferably, the following conditional formula is also satisfied: 0.3<Yc62/ImgH<0.6 wherein Yc62And the vertical distance from the inflection point of the image side surface of the sixth lens to the optical axis is shown, and ImgH represents half of the diagonal length of the effective pixel area on the imaging surface of the wide-angle lens.
An electronic device comprises an image pickup device, wherein the image pickup device comprises an electronic photosensitive element and a wide-angle lens, and the electronic photosensitive element is arranged on an imaging surface of the wide-angle lens.
In view of the above technical solutions, the wide-angle lens provided by the present invention includes a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element, which are sequentially disposed from an object side to an image side, wherein an object side light sequentially passes through the lens elements and is imaged on an image plane located at the image side of the sixth lens element. The wide-angle lens is of a six-piece lens structure, reasonable surface shapes and optimal range combination of optical parameters of the lenses are adopted, good imaging quality can be achieved, the ratio of the center thickness to the edge thickness of the second lens is reasonably configured, manufacturing and forming of the second lens are facilitated, and the manufacturing yield of the lens is improved. In addition, the second lens with positive refractive power and the third lens with negative refractive power are made of proper materials, so that chromatic aberration of the lens from the axial direction to the axial direction can be corrected well. Therefore, the wide-angle lens is light, thin, short and small, can well correct aberration, has high pixel, high resolution and excellent imaging quality, and can meet the application requirements.
The electronic equipment provided by the invention can achieve the beneficial effects.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic view of a wide-angle lens provided in embodiment 1 of the present invention;
fig. 2(a) and 2(b) are an astigmatism graph and a distortion graph of the wide-angle lens in embodiment 1 of the present invention, respectively;
fig. 3 is a spherical aberration diagram of the wide-angle lens in embodiment 1 of the present invention;
fig. 4 is a schematic view of a wide-angle lens provided in embodiment 2 of the present invention;
fig. 5(a) and 5(b) are an astigmatism graph and a distortion graph of the wide-angle lens in embodiment 2 of the present invention, respectively;
fig. 6 is a spherical aberration diagram of the wide-angle lens in embodiment 2 of the present invention;
fig. 7 is a schematic view of a wide-angle lens provided in embodiment 3 of the present invention;
fig. 8(a) and 8(b) are an astigmatism graph and a distortion graph of the wide-angle lens in embodiment 3 of the present invention, respectively;
fig. 9 is a spherical aberration diagram of the wide-angle lens in embodiment 3 of the present invention;
fig. 10 is a schematic view of a wide-angle lens provided in embodiment 4 of the present invention;
fig. 11(a) and 11(b) are an astigmatism graph and a distortion graph of the wide-angle lens in embodiment 4 of the present invention, respectively;
FIG. 12 is a spherical aberration diagram of the wide-angle lens in embodiment 4 of the present invention;
fig. 13 is a schematic view of a wide-angle lens provided in embodiment 5 of the present invention;
fig. 14(a) and 14(b) are an astigmatism graph and a distortion graph of the wide-angle lens in embodiment 5 of the present invention, respectively;
FIG. 15 is a spherical aberration diagram of the wide-angle lens in embodiment 5 of the present invention;
fig. 16 is a schematic view of a wide-angle lens provided in embodiment 6 of the present invention;
fig. 17(a) and 17(b) are an astigmatism graph and a distortion graph of the wide-angle lens in embodiment 6 of the present invention, respectively;
fig. 18 is a spherical aberration diagram of the wide-angle lens in embodiment 6 of the present invention;
FIG. 19 shows SAG in Wide-angle lens according to embodiment 1 of the present invention32A schematic diagram of (a);
FIG. 20 shows Yc of a wide-angle lens system in accordance with embodiment 1 of the present invention52A schematic diagram of (a);
FIG. 21 shows Yc in the wide-angle lens system according to embodiment 1 of the invention62Schematic representation of (a).
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The invention provides a wide-angle lens which sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens from an object side to an image side, wherein each lens is provided with an object side surface facing an object side and an image side surface facing an image side. The wide-angle lens further comprises an imaging surface positioned on one side of the sixth lens facing the image space, and an optical filter arranged between the sixth lens and the imaging surface, wherein the optical filter does not influence the focal length of the wide-angle lens.
The first lens element with negative refractive power is helpful for enlarging the field angle and controlling the total track length of the lens, so as to effectively maintain the miniaturization of the lens. The object-side surface of the first lens element is concave at paraxial region and changes from concave to convex from paraxial region to edge. The image-side surface of the first lens element may be concave at the paraxial region. Therefore, the refraction of the incident light is relatively mild, and the astigmatism of the lens can be favorably corrected.
The second lens element with positive refractive power has a convex object-side surface and a convex image-side surface, which is helpful for concentrating the light converging ability of the lens on the second lens element, thereby increasing the range of light entering the lens element to enlarge the field angle.
The third lens element with negative refractive power can correct aberration of the lens. The object-side surface of the third lens element can be convex at the paraxial region, and the image-side surface thereof can be concave at the paraxial region, so that the principal point of the lens element can be farther away from the image plane, thereby reducing the total track length of the lens element and maintaining the miniaturization of the lens element.
The fourth lens element with positive refractive power has a concave object-side surface at paraxial region and a convex object-side surface from paraxial region to peripheral region. The image side surface of the fourth lens element can be convex, which is helpful for reducing the sensitivity of the lens and correcting astigmatism, so as to improve the imaging quality.
The fifth lens element with negative refractive power has a convex object-side surface at paraxial region, and can correct off-axis aberration, improve peripheral illumination of image, and prevent dark corner. The image-side surface of the fifth lens element can be concave at a paraxial region thereof, which helps prevent excessive concentration of refractive power in the fifth lens element and can reduce excessive curvature of the peripheral region of the lens element, thereby reducing molding defects.
The sixth lens element with negative refractive power has a concave image-side surface at paraxial region and at least one inflection point on the image-side surface, which helps to keep the principal point of the lens away from the image-side end, thereby effectively shortening the total track length of the wide-angle lens, facilitating the miniaturization of the wide-angle lens, and further correcting off-axis aberration to improve the peripheral imaging quality.
The wide-angle lens adopts reasonable surface shape and optimized range combination of optical parameters of each lens, and satisfies R11<0，R51>0，R11Denotes the radius of curvature, R, of the object-side surface of the first lens51The curvature radius of the object side surface of the fifth lens is shown, and good imaging quality can be achieved. Wherein, the ratio of the central thickness to the edge thickness of the second lens is reasonably configured to satisfy 1.1<CT2/ET2<1.8，CT2Denotes the thickness, ET, of the second lens on the optical axis2The edge thickness of the second lens is shown, which is beneficial to the manufacturing and molding of the second lens and improves the manufacturing yield of the lens. Moreover, the second lens with positive refractive power and the third lens with negative refractive power are made of proper materials, so that the requirement of V is met2>50，V3<30，V2Denotes the Abbe number, V, of the second lens3The third lens has an abbe number indicating the third lens, and can correct chromatic aberration of the lens from the axial direction to the off-axial direction well. Therefore, the six-piece wide-angle lens is light, thin, short and small, can well correct aberration, has high pixel, high resolution and excellent imaging quality, and can meet the application requirements.
Preferably, the wide-angle lens further satisfies the following conditional expression: the FOV is more than or equal to 119 degrees, wherein the FOV represents the maximum field angle of the wide-angle lens. Satisfying this condition can provide a large field angle to obtain a desired and appropriate image capture range. Preferably, the FOV is more than or equal to 125 degrees.
Preferably, the wide-angle lens further satisfies the following conditional expression: 1<(R61+R62)/(R61-R62) Is less than or equal to 5, wherein R is61Represents a radius of curvature, R, of an object-side surface of the sixth lens62Representing the sixth lens imageThe radius of curvature of the side. Through reasonable and optimized configuration of the surface curvatures of the sixth lens, astigmatism, field curvature, chromatic aberration or spherical aberration of the lens can be further corrected.
Preferably, the wide-angle lens further satisfies the following conditional expression: 0.2< BL/f is less than or equal to 0.6, wherein BL represents the distance between the image side surface of the sixth lens and the imaging surface on the optical axis, and f represents the focal length of the wide-angle lens. The BL/f value is lower than the upper limit value of 0.6, so that the back focus of the lens can be ensured, and the space and the manufacturability are favorably improved; the BL/f value is higher than the lower limit value of 0.2, and the refractive index of each lens can be prevented from becoming too strong.
Preferably, the wide-angle lens further satisfies the following conditional expression: yc is not less than 0.552/Yc62<1.5 wherein Yc52Denotes the vertical distance Yc from the point of inflection of the image-side surface of the fifth lens to the optical axis62And the vertical distance from the inflection point of the image side surface of the sixth lens to the optical axis is shown. Satisfying the condition can effectively improve the light height, satisfy the requirement of high pixel of the lens, and make the light deflection tend to be relaxed, and can effectively reduce the sensitivity of the lens, and simultaneously can effectively correct the coma aberration, distortion and chromatic aberration of the lens.
Preferably, the wide-angle lens further satisfies the following conditional expression: SAG of 0.4 ≤32/CT3<1.1, wherein SAG32Representing the horizontal displacement distance on the optical axis from the intersection point of the image side surface of the third lens and the optical axis to the maximum effective radius position of the image side surface of the third lens, CT3Represents the thickness of the third lens on the optical axis. The shape change of the center and the periphery of the third lens is controlled, so that the processing, the manufacturing and the assembly are facilitated.
Preferably, the wide-angle lens further satisfies the following conditional expression: i f/f1|<1, where f denotes the focal length of the wide-angle lens, f1Representing the focal length of the first lens. By reasonably distributing the ratio of the total effective focal length of the lens to the effective focal length of the first lens, the focal power can be effectively distributed, and the sensitivity of the lens is reduced.
Preferably, the wide-angle lens further satisfies the following conditional expression: 0.3<Yc62/ImgH<0.6 wherein Yc62Representing the image side surface of the sixth lensImgH represents a half of a diagonal length of an effective pixel area on an imaging surface of the wide-angle lens. The method is favorable for correcting the incident angle of the chief ray on the image plane, improves the matching property with the photosensitive chip and ensures the uniform brightness of the whole image plane.
It should be noted that the refractive power refers to the refractive power of the optical system for reflecting the incident parallel light beam. The optical system has positive refractive power, which indicates that the refraction of the light rays is convergent; the optical system has negative refractive power, indicating that the refraction of light is divergent. In the wide-angle lens of the invention, if the refractive power or the focal length of the lens element does not define the position of the area, it means that the refractive power or the focal length of the lens element can be the refractive power or the focal length of the lens element at the paraxial region.
For each lens arrangement in the lens, in the case of left to right from the object side to the image side, a convex object side of the lens means that any point on the object side of the lens is tangent, the surface is always on the right of the tangent plane, the radius of curvature is positive, otherwise, the object side is concave, and the radius of curvature is negative. The image side surface of the lens is convex, which means that any point on the passing surface of the image side surface of the lens is tangent, the surface is always on the left side of the tangent plane, the curvature radius is negative, otherwise, the image side surface is concave, and the curvature radius is positive. If a section is made through any point on the object-side or image-side surface of the lens, the surface has both a portion to the left of the section and a portion to the right of the section, and the surface has points of inflection. The above applies to the determination of the presence of irregularities at the paraxial region of the object-side surface and the image-side surface of the lens. In addition, the paraxial region refers to a region near the optical axis. In the wide-angle lens of the invention, if the lens surface is a convex surface and the position of the convex surface is not defined, it means that the convex surface can be positioned at the position of the lens surface near the optical axis; if the lens surface is concave and the position of the concave surface is not defined, it means that the concave surface can be located at the position of the lens surface near the optical axis.
In the wide-angle lens disclosed by the invention, the lenses are made of materials with high light transmittance and excellent machinability, for example, the lenses are made of plastics, so that the lenses are favorably manufactured and molded, the manufacturing yield is improved, the material meeting the condition is low in cost and easy to obtain, and the production cost is favorably reduced. In addition, the object-side surface and the image-side surface of each lens can be Aspheric Surfaces (ASP), the aspheric surfaces can be easily made into shapes other than spherical surfaces, more control variables are obtained for reducing the aberration, and the number of the lenses is further reduced, so that the total length of the photographic lens can be effectively reduced. In addition, the interval can be arranged between any two adjacent lenses of the wide-angle lens, which is beneficial to the assembly of the lenses and improves the manufacturing yield.
In addition, in the wide-angle lens, at least one diaphragm can be arranged according to requirements so as to reduce stray light and be beneficial to improving the imaging quality. In the present invention, the aperture configuration may be a mid-stop, i.e. the aperture is disposed between the first lens and the imaging plane, which helps to enlarge the field angle of the system, so that the wide-angle lens has the advantages of the wide-angle lens.
The wide-angle lens of the present invention will be described in detail with reference to specific embodiments. It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments with reference to the attached drawings.
[ example 1 ]
Referring to fig. 1, a schematic structural diagram of the wide-angle lens of embodiment 1 is shown. As can be seen from the figure, the wide-angle lens of the present embodiment includes a first lens element 11, a stop 10, a second lens element 12, a third lens element 13, a fourth lens element 14, a fifth lens element 15, and a sixth lens element 16, which are sequentially disposed from an object side to an image side, each of the lens elements has an object-side surface facing an object side and an image-side surface facing an image side, and both the object-side surface and the image-side surface of each of the lens elements are aspheric. The first lens element 11 with negative refractive power has a concave object-side surface at a paraxial region and a concave image-side surface at a paraxial region, and is made of plastic material. The second lens element 12 with positive refractive power has a convex object-side surface at a paraxial region and a convex image-side surface at a paraxial region, and is made of plastic material. The third lens element 13 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 is made of plastic material. The fourth lens element 14 with positive refractive power has a concave object-side surface at a paraxial region and a convex image-side surface at a paraxial region, and is made of plastic material. The fifth lens element 15 with negative refractive power is made of plastic, and has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region. The sixth lens element 16 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 is made of plastic material, and has at least one inflection point on the image-side surface. In addition, the wide-angle lens further includes an infrared filter 17 disposed between the sixth lens element 16 and the image plane 18, and the infrared filter 17 filters out the infrared band light entering the optical lens assembly, so as to prevent the infrared light from irradiating the photosensitive chip to generate noise. The optional filter is made of glass and does not affect the focal length.
The values of the wide-angle lens of the present embodiment satisfying the conditional expressions are shown in table 7. In addition, referring to fig. 19, 20 and 21, the horizontal displacement distance SAG on the optical axis from the intersection point of the image-side surface of the third lens 13 and the optical axis to the maximum effective radius position of the image-side surface of the third lens 1332As shown in FIG. 19, the vertical distance Yc from the inflection point 1521 on the image-side surface of the fifth lens 15 to the optical axis52As shown in FIG. 20, the vertical distance Yc from the inflection point 1621 on the image-side surface of the sixth lens element 16 to the optical axis62As shown in fig. 21.
In the detailed optical data of embodiment 1, as shown in table 1-1, the unit of the radius of curvature, the thickness and the focal length is mm, f is the focal length of the wide-angle lens, Fno is the aperture value, FOV is the maximum field of view, and surfaces 0-16 sequentially represent the surfaces from the object side to the image side. Surfaces 1-13 sequentially represent a first lens object-side surface, a first lens image-side surface, an aperture, a second lens object-side surface, a second lens image-side surface, a third lens object-side surface, a third lens image-side surface, a fourth lens object-side surface, a fourth lens image-side surface, a fifth lens object-side surface, a fifth lens image-side surface, a sixth lens object-side surface, and a sixth lens image-side surface.
TABLE 1-1
Figure BDA0002082567140000091
Figure BDA0002082567140000101
Each lens in the wide-angle lens adopts an aspheric surface design, and the curve equation of the aspheric surface is expressed as follows:
Figure BDA0002082567140000102
wherein X represents the relative distance between a point on the aspheric surface with a distance of Y from the optical axis and a tangent plane tangent to the vertex on the aspheric surface optical axis; r represents a radius of curvature; y represents a perpendicular distance between a point on the aspherical curve and the optical axis; k represents a conic coefficient; ai represents the i-th order aspheric coefficients.
The aspherical surface coefficients of the lenses of this embodiment are shown in Table 1-2, where k represents the conic coefficient in the aspherical curve equation, and A4-A20 represent the aspherical surface coefficients of 4 th to 20 th orders, respectively. The astigmatism graph, the distortion graph and the spherical aberration graph of the wide-angle lens of the embodiment are respectively shown in fig. 2(a), fig. 2(b) and fig. 3, wherein the wavelength in the astigmatism graph and the distortion graph is 0.555 μm, and the wavelength in the spherical aberration graph is 0.470 μm, 0.510 μm, 0.555 μm, 0.610 μm and 0.650 μm. In addition, the following tables of the embodiments correspond to the wide-angle lens schematic diagram, the astigmatism graph, the distortion graph and the spherical aberration graph of the embodiments, and the definitions of the data in the tables are the same as those in tables 1-1 and 1-2 of embodiment 1, which will not be described again.
Tables 1 to 2
Figure BDA0002082567140000103
Figure BDA0002082567140000111
[ example 2 ]
Referring to fig. 4, a schematic structural diagram of the wide-angle lens of embodiment 2 is shown. As can be seen from the figure, the wide-angle lens of the present embodiment includes, in order from an object side to an image side, a first lens 21, a stop 20, a second lens 22, a third lens 23, a fourth lens 24, a fifth lens 25, and a sixth lens 26, where each lens 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 aspheric. The first lens element 21 with negative refractive power has a concave object-side surface at a paraxial region and a concave image-side surface at a paraxial region, and is made of plastic material. The second lens element 22 with positive refractive power has a convex object-side surface at a paraxial region and a convex image-side surface at a paraxial region, and is made of plastic material. The third lens element 23 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 is made of plastic. The fourth lens element 24 with positive refractive power has a concave object-side surface at a paraxial region and a convex image-side surface at a paraxial region, and is made of plastic material. The fifth lens element 25 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 is made of plastic. The sixth lens element 26 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 is made of plastic material, wherein the image-side surface has at least one inflection point. In addition, the wide-angle lens further includes an infrared filter 27 disposed between the sixth lens element 26 and the image plane 28, and the infrared filter 27 filters the infrared band light entering the optical lens assembly to avoid the infrared light from irradiating the photosensitive chip to generate noise. The optional filter is made of glass and does not affect the focal length.
Please refer to the following Table 2-1, Table 2-2 and Table 7. The corresponding astigmatism, distortion and spherical aberration plots are shown in fig. 5(a), 5(b) and 6, respectively.
TABLE 2-1
Figure BDA0002082567140000121
Tables 2 to 2
Figure BDA0002082567140000131
[ example 3 ]
Referring to fig. 7, a schematic structural diagram of the wide-angle lens of embodiment 3 is shown. As can be seen, the wide-angle lens of this embodiment includes, in order from an object side to an image side, a first lens element 31, a stop 30, a second lens element 32, a third lens element 33, a fourth lens element 34, a fifth lens element 35, and a sixth lens element 36, where each lens element 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 element are aspheric. The first lens element 31 with negative refractive power has a concave object-side surface at a paraxial region and a concave image-side surface at a paraxial region, and is made of plastic material. The second lens element 32 with positive refractive power has a convex object-side surface at a paraxial region and a convex image-side surface at a paraxial region, and is made of plastic material. The third lens element 33 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 is made of plastic material. The fourth lens element 34 with positive refractive power has a concave object-side surface at a paraxial region and a convex image-side surface at a paraxial region, and is made of plastic material. The fifth lens element 35 with negative refractive power is made of plastic, and has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region. The sixth lens element 36 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 is made of plastic material, and the image-side surface has at least one inflection point. In addition, the wide-angle lens further includes an infrared filter 37 disposed between the sixth lens 36 and the image plane 38, and the infrared filter 37 filters the infrared band light entering the optical lens assembly to prevent the infrared light from irradiating the photo sensor chip to generate noise. The optional filter is made of glass and does not affect the focal length.
Please refer to the following Table 3-1, Table 3-2 and Table 7. The corresponding astigmatism, distortion and spherical aberration plots are shown in fig. 8(a), 8(b) and 9, respectively.
TABLE 3-1
Figure BDA0002082567140000141
Figure BDA0002082567140000151
TABLE 3-2
Figure BDA0002082567140000152
[ example 4 ]
Referring to fig. 10, a schematic structural diagram of the wide-angle lens of embodiment 4 is shown. As can be seen, the wide-angle lens of this embodiment includes, in order from an object side to an image side, a first lens 41, a stop 40, a second lens 42, a third lens 43, a fourth lens 44, a fifth lens 45, and a sixth lens 46, where each lens has an object-side surface facing an 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 aspheric. The first lens element 41 with negative refractive power has a concave object-side surface at a paraxial region and a concave image-side surface at a paraxial region, and is made of plastic material. The second lens element 42 with positive refractive power has a convex object-side surface at a paraxial region and a convex image-side surface at a paraxial region, and is made of plastic material. The third lens element 43 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 is made of plastic material. The fourth lens element 44 with positive refractive power has a concave object-side surface at a paraxial region and a convex image-side surface at a paraxial region, and is made of plastic material. The fifth lens element 45 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 is made of plastic material. The sixth lens element 46 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 is made of plastic material, and has at least one inflection point on the image-side surface. In addition, the wide-angle lens further includes an infrared filter 47 disposed between the sixth lens element 46 and the image plane 48, and the infrared filter 47 filters the infrared band light entering the optical lens assembly to prevent the infrared light from irradiating the photo sensor chip to generate noise. The optional filter is made of glass and does not affect the focal length.
Please refer to the following Table 4-1, Table 4-4 and Table 7. The corresponding astigmatism, distortion, and spherical aberration plots are shown in fig. 11(a), 11(b), and 12, respectively.
TABLE 4-1
Figure BDA0002082567140000161
Figure BDA0002082567140000171
TABLE 4-2
Figure BDA0002082567140000172
[ example 5 ]
Referring to fig. 13, a schematic structural diagram of the wide-angle lens of embodiment 5 is shown. As can be seen, the wide-angle lens of this embodiment includes, in order from an object side to an image side, a first lens 51, a stop 50, a second lens 52, a third lens 53, a fourth lens 54, a fifth lens 55, and a sixth lens 56, where each lens has an object-side surface facing an object side and an image-side surface facing an image side, and the object-side surface and the image-side surface of each lens are aspheric. The first lens element 51 with negative refractive power has a concave object-side surface at a paraxial region and a concave image-side surface at a paraxial region, and is made of plastic material. The second lens element 52 with positive refractive power has a convex object-side surface at a paraxial region and a convex image-side surface at a paraxial region, and is made of plastic material. The third lens element 53 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 is made of plastic. The fourth lens element 54 with positive refractive power has a concave object-side surface at a paraxial region and a convex image-side surface at a paraxial region, and is made of plastic. The fifth lens element 55 with negative refractive power is made of plastic, and has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region. The sixth lens element 56 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 has at least one inflection point on the image-side surface. In addition, the wide-angle lens further includes an infrared filter 57 disposed between the sixth lens 56 and the image plane 58, and the infrared filter 57 filters the infrared band light entering the optical lens assembly to avoid the infrared light from irradiating the photosensitive chip to generate noise. The optional filter is made of glass and does not affect the focal length.
Please refer to the following Table 5-1, Table 5-5 and Table 7. The corresponding astigmatism, distortion, and spherical aberration plots are shown in fig. 14(a), 14(b), and 15, respectively.
TABLE 5-1
Figure BDA0002082567140000181
Figure BDA0002082567140000191
TABLE 5-2
Figure BDA0002082567140000192
Figure BDA0002082567140000201
[ example 6 ]
Referring to fig. 16, a schematic structural diagram of the wide-angle lens of embodiment 6 is shown. As can be seen, the wide-angle lens of this embodiment includes, in order from an object side to an image side, a first lens 61, a stop 60, a second lens 62, a third lens 63, a fourth lens 64, a fifth lens 65, and a sixth lens 66, where each lens has an object-side surface facing an 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 aspheric. The first lens element 61 with negative refractive power has a concave object-side surface at a paraxial region and a concave image-side surface at a paraxial region, and is made of plastic material. The second lens element 62 with positive refractive power has a convex object-side surface at a paraxial region and a convex image-side surface at a paraxial region, and is made of plastic material. The third lens element 63 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 is made of plastic. The fourth lens element 64 with positive refractive power has a concave object-side surface at a paraxial region and a convex image-side surface at a paraxial region, and is made of plastic material. The fifth lens element 65 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 is made of plastic. The sixth lens element 66 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 is made of plastic material. In addition, the wide-angle lens further includes an infrared filter 67 disposed between the sixth lens element 66 and the image plane 68, and the infrared filter 67 filters out the infrared band light entering the optical lens assembly to prevent the infrared light from irradiating the photosensitive chip to generate noise. The optional filter is made of glass and does not affect the focal length.
Please refer to the following Table 6-1, Table 6-6 and Table 7. The corresponding astigmatism, distortion, and spherical aberration plots are shown in fig. 17(a), 17(b), and 18, respectively.
TABLE 6-1
Figure BDA0002082567140000202
Figure BDA0002082567140000211
TABLE 6-2
Figure BDA0002082567140000212
Figure BDA0002082567140000221
In summary, examples 1 to 6 each satisfy the relationship shown in table 7.
TABLE 7
Figure BDA0002082567140000222
Correspondingly, the embodiment of the invention also provides electronic equipment which comprises an image pickup device, wherein the image pickup device comprises an electronic photosensitive element and the wide-angle lens, and the electronic photosensitive element is arranged on an imaging surface of the wide-angle lens.
In the electronic device provided by this embodiment, the wide-angle lens employed by the image capturing apparatus is a six-piece lens structure, and each lens employs a reasonable surface shape and an optimal range combination of optical parameters of each lens, so that good imaging quality can be achieved, wherein a ratio of a center thickness to an edge thickness of the second lens is reasonably configured, which is helpful for manufacturing and molding the second lens, so as to improve a manufacturing yield of the lens.

Claims (9)

1. A wide-angle lens, comprising, in order from an object side to an image side, a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element, wherein each lens element 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 element are aspheric, wherein: the first lens element with negative refractive power having a concave object-side surface at a paraxial region, the second lens element with positive refractive power having convex object-side and image-side surfaces, the third lens element with negative refractive power, the fourth lens element with positive refractive power, the fifth lens element with negative refractive power having a convex object-side surface at a paraxial region, the sixth lens element with negative refractive power having a concave image-side surface at a paraxial region, and the image-side surface with at least one inflection point; and satisfies the following conditional expressions:
1.1<CT2/ET2<1.8，R11<0，R51>0，V2>50，V3<30；
wherein, CT2Denotes the thickness of the second lens on the optical axis, ET2Denotes the edge thickness, R, of the second lens11Represents a radius of curvature, R, of an object-side surface of the first lens51Represents a radius of curvature, V, of an object-side surface of the fifth lens2Expressing the Abbe number, V, of the second lens3Representing an abbe number of the third lens;
the following conditional expressions are also satisfied: 1<(R61+R62)/(R61-R62) Is less than or equal to 5, wherein R is61Represents a radius of curvature, R, of an object-side surface of the sixth lens62Represents a radius of curvature of the image-side surface of the sixth lens element.
2. The wide-angle lens of claim 1, wherein the fourth lens element has a concave object-side surface at paraxial region and a change from concave to convex object-side surface from paraxial region to edge.
3. The wide-angle lens according to claim 1, further satisfying the following conditional expression: the FOV is more than or equal to 119 degrees, wherein the FOV represents the maximum field angle of the wide-angle lens.
4. The wide-angle lens according to claim 1, further satisfying the following conditional expression: 0.2< BL/f is less than or equal to 0.6, wherein BL represents the distance between the image side surface of the sixth lens and the imaging surface on the optical axis, and f represents the focal length of the wide-angle lens.
5. Root of herbaceous plantThe wide-angle lens according to claim 1, further satisfying the following conditional expression: yc is not less than 0.552/Yc62<1.5 wherein Yc52Denotes the vertical distance Yc from the point of inflection of the image-side surface of the fifth lens to the optical axis62And the vertical distance from the inflection point of the image side surface of the sixth lens to the optical axis is shown.
6. The wide-angle lens according to claim 1, further satisfying the following conditional expression: SAG of 0.4 ≤32/CT3<1.1, wherein SAG32Representing the horizontal displacement distance on the optical axis from the intersection point of the image side surface of the third lens and the optical axis to the maximum effective radius position of the image side surface of the third lens, CT3Represents the thickness of the third lens on the optical axis.
7. The wide-angle lens according to claim 1, further satisfying the following conditional expression: i f/f1|<1, where f denotes the focal length of the wide-angle lens, f1Representing the focal length of the first lens.
8. The wide-angle lens according to claim 1, further satisfying the following conditional expression: 0.3<Yc62/ImgH<0.6 wherein Yc62And the vertical distance from the inflection point of the image side surface of the sixth lens to the optical axis is shown, and ImgH represents half of the diagonal length of the effective pixel area on the imaging surface of the wide-angle lens.
9. An electronic apparatus characterized by comprising an image pickup device including an electron-sensitive element provided on an imaging surface of the wide-angle lens and the wide-angle lens of any one of claims 1 to 8.
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