CN110187473B - Five-piece type wide-angle lens and electronic equipment - Google Patents
Five-piece type wide-angle lens and electronic equipment Download PDFInfo
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- CN110187473B CN110187473B CN201910542748.7A CN201910542748A CN110187473B CN 110187473 B CN110187473 B CN 110187473B CN 201910542748 A CN201910542748 A CN 201910542748A CN 110187473 B CN110187473 B CN 110187473B
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- 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
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- 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
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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
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
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 continuously increased. In some specific scenes, the camera module is also required to have a larger field angle, 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 having a small size, a large angle of view, and excellent image quality.
Disclosure of Invention
The invention aims to provide a five-piece wide-angle lens which is light, thin, short and small, can well correct aberration, has high pixel, high resolution, large field angle 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 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 the object side and an image-side surface facing the 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 the edge thickness of the first lens.
Preferably, the following conditional formula is also satisfied: 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.
Preferably, the following conditional formula is also satisfied: v1-V5>20, wherein V1Expressing the Abbe number, V, of the first lens5Representing the abbe number of the fifth lens.
Preferably, the following conditional formula is also satisfied: 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.
Preferably, the following conditional formula is also satisfied: 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.
Preferably, the following conditional formula is also satisfied: 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.
Preferably, the following conditional formula is also satisfied: 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.
Preferably, the following conditional formula is also satisfied: f/f is more than or equal to 0.92Less than or equal to 1.3, wherein f represents the focal length of the five-piece wide-angle lens, f2Representing the focal length of the second lens.
Preferably, the following conditional formula is also satisfied: -2.6<f1/f2<-1.7，f1Denotes the focal length of the first lens, f2Representing the focal length of the second lens.
An electronic device, comprising an image pickup device, wherein the image pickup device comprises an electronic photosensitive element and five-piece wide-angle lens, and the electronic photosensitive element is arranged on an imaging surface of the five-piece wide-angle lens.
In view of the above technical solutions, the five-lens 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, which are sequentially disposed from an object side to an image side, where object side light sequentially passes through the lenses to be imaged on an imaging surface located at the image side of the fifth lens. The five-piece wide-angle lens is beneficial to miniaturization and angle of field expansion of the lens 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, enables the object side surface of the first lens to be gentle by controlling the shape of the object side surface of the first lens, and is beneficial to molding and position arrangement of the first lens. The five-piece wide-angle lens provided by the invention is light, thin, short and small, can well correct aberration, has high pixel, high resolution, large field angle 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 diagram of a five-lens 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 a five-piece wide-angle lens in embodiment 1 of the present invention, respectively;
fig. 3 is a spherical aberration curve chart of a five-piece wide-angle lens in embodiment 1 of the present invention;
fig. 4 is a schematic diagram of a five-lens 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 a five-piece wide-angle lens in embodiment 2 of the present invention, respectively;
fig. 6 is a spherical aberration curve chart of a five-piece wide-angle lens in embodiment 2 of the present invention;
fig. 7 is a schematic diagram of a five-lens type 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 a five-piece wide-angle lens in embodiment 3 of the present invention, respectively;
fig. 9 is a spherical aberration curve chart of a five-piece wide-angle lens in embodiment 3 of the present invention;
fig. 10 is a schematic diagram of a five-lens type 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 a five-piece wide-angle lens in embodiment 4 of the present invention, respectively;
fig. 12 is a spherical aberration curve chart of a five-piece wide-angle lens in embodiment 4 of the present invention;
fig. 13 is a schematic diagram of a five-lens type 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 a five-piece wide-angle lens in embodiment 5 of the present invention, respectively;
fig. 15 is a spherical aberration curve chart of a five-piece wide-angle lens in embodiment 5 of the present invention;
fig. 16 is a schematic diagram of a five-lens type 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 a five-piece wide-angle lens in embodiment 6 of the present invention, respectively;
fig. 18 is a spherical aberration curve chart of a five-piece wide-angle lens in embodiment 6 of the present invention;
FIG. 19 shows SAG in five-piece wide-angle lens according to embodiment 1 of the present invention11A schematic diagram of (a);
FIG. 20 shows SAG in five-piece wide-angle lens according to embodiment 1 of the present invention41A schematic diagram of (a);
FIG. 21 shows Yc of a five-lens wide-angle lens system according to embodiment 1 of the present invention52Schematic 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 five-piece wide-angle lens which sequentially comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens from an object side to an image side, wherein each lens is provided with an object side surface facing an object space and an image side surface facing the image space. The optical filter is arranged between the fifth lens and the imaging surface, and the focal length of the five-piece wide-angle lens is not influenced by the optical filter.
The first lens element with negative refractive power has a convex object-side surface at paraxial region and a concave image-side surface at paraxial region, and is effective for enlarging the field angle and controlling the total track length of the lens element to maintain the miniaturization of the lens element.
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 concave 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 has a convex object-side surface changing from concave at paraxial region to convex at edge, and a convex image-side surface for reducing lens sensitivity and correcting astigmatism to improve image 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 avoid dark angle. The image side surface of the fifth lens is concave at the paraxial region, and has at least one inflection point, which is helpful for keeping the principal point of the lens away from the image side end, thereby effectively shortening the total length of the five-piece wide-angle lens, facilitating the miniaturization of the five-piece wide-angle lens, and further correcting the off-axis aberration to improve the peripheral imaging quality.
The five-piece wide-angle lens meets the requirement that T is more than 0.9 through 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 lens12/CT1≤1.3，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, CT1The thickness of the first lens on the optical axis is shown, which is beneficial to the miniaturization of the lens and the expansion of the field angle. And the shape of the object side surface of the first lens is controlled to satisfy 0.5<SAG11/ET1<0.9，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, ET1The edge thickness of the first lens is expressed, so that the object side shape of the first lens is smooth, the first lens is beneficial to molding and position arrangement, and the production yield is improved. The five-piece wide-angle lens is light, thin, short and small, can well correct aberration, has high pixel, high resolution, large field angle and excellent imaging quality, and can meet the application requirements.
Preferably, the five-piece wide-angle lens further satisfies the following conditional expression: 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. Satisfying this condition can provide a large field angle to obtain a desired proper image capture range. Preferably, the FOV is more than or equal to 125 degrees.
Preferably, the five-piece wide-angle lens further satisfies the following conditional expression: v1-V5>20, wherein V1Expressing the Abbe number, V, of the first lens5Representing the abbe number of the fifth lens. By selecting a material satisfying this conditional expression to manufacture the first lens closest to the object side and the fifth lens closest to the image side, it is possible to improve the resolution of the optical lens and correct chromatic aberration of the lens favorably.
Preferably, the five-piece wide-angle lens further satisfies 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. By properly configuring the shape of the object side surface of the fourth lens and the thickness of the fourth lens, the processing, the manufacturing and the assembly are facilitated.
Preferably, the five-piece wide-angle lens further satisfies 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. The condition is satisfied, so that the incident angle of the principal ray on the image surface is favorably corrected, the matching performance with the photosensitive chip is improved, and the brightness uniformity of the whole image surface is ensured.
Preferably, the five-piece wide-angle lens further satisfies 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. The second lens has a proper shape by reasonably configuring the curvature radii of the object side surface and the image side surface of the second lens, and is favorable for correcting the spherical aberration of the optical pick-up lens so as to improve the imaging quality.
Preferably, the five-piece wide-angle lens further satisfies 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. Satisfying this condition makes the sensitivity of the lens more appropriate, and contributes to improving the manufacturing yield of lens assembly.
Preferably, the five-piece wide-angle lens further satisfies the following conditional expression: f/f is more than or equal to 0.92Less than or equal to 1.3, wherein f isShowing the focal length of the five-piece wide-angle lens, f2Representing 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 focal power can be effectively distributed, and the sensitivity of the lens is reduced.
Preferably, the five-piece wide-angle lens further satisfies the following conditional expression: -2.6<f1/f2<-1.7，f1Denotes the focal length of the first lens, f2Representing the focal length of the second lens. Therefore, the refractive power configuration of the first lens element and the second lens element is suitable, which is beneficial to obtaining a wide field angle and reducing lens aberration. The first lens and the second lens form a negative-positive telescopic structure, so that the total optical length of the lens can be effectively reduced.
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 five-lens type wide-angle lens of the invention, if the refractive power or focal length of the lens element does not define the position of the area, it means that the refractive power or focal length of the lens element can be the refractive power or 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 five-piece 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 close to the 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 can be located at the position of the lens surface near the optical axis.
In the five-piece 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, 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, any two adjacent lenses of the five-piece wide-angle lens can be provided with intervals, so that the assembly of the lenses is facilitated, and the manufacturing yield is improved.
In addition, in the five-piece 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 center-located aperture, that is, the aperture is located 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 advantage of the aperture, and in the present invention, the aperture is specifically located between the first lens and the second lens.
The five-lens 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 a five-lens wide-angle lens in embodiment 1 is shown. As can be seen from the figure, the five-lens wide-angle lens of the embodiment includes a first lens element 11, an aperture stop 10, a second lens element 12, a third lens element 13, a fourth lens element 14, and a fifth lens element 15, which are sequentially disposed from an object side to an image side along an optical axis, 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. The first lens element 11 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 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 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 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 has a convex object-side surface at a paraxial region, a concave image-side surface at a paraxial region, and at least one inflection point on the image-side surface. In addition, the five-piece wide-angle lens further comprises an infrared filter 16 disposed between the fifth lens 15 and the imaging surface 17, and the infrared filter 16 filters infrared band light entering the lens to prevent 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 five-piece wide-angle lens of the present embodiment satisfying the conditional expressions are shown in table 7. Referring to fig. 19, 20 and 21, the horizontal displacement distance SAG on the optical axis from the intersection point of the object-side surface of the first lens element 11 and the optical axis to the maximum effective radius position of the object-side surface of the first lens element 1111As shown in FIG. 19, the horizontal displacement distance SAG on the optical axis from the intersection point of the object-side surface of the fourth lens 14 and the optical axis to the maximum effective radius position of the object-side surface of the fourth lens41As shown in FIG. 20, 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. 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 five-piece wide-angle lens, Fno is the aperture value, FOV is the maximum field angle, and surfaces 0-14 sequentially represent the surfaces from the object side to the image side. Wherein surfaces 1-11 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, and a fifth lens image-side surface.
TABLE 1-1
Each lens in the five-piece type wide-angle lens adopts an aspheric surface design, and the curve equation of the aspheric surface is expressed as follows:
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 five-piece 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 schematic structure diagram, the astigmatism graph, the distortion graph and the spherical aberration graph of the five-piece wide-angle lens of each embodiment, 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
[ example 2 ]
Referring to fig. 4, a schematic structural diagram of a five-lens wide-angle lens in embodiment 2 is shown. As can be seen from the figure, the five-lens wide-angle lens of the embodiment includes a first lens 21, an aperture stop 20, a second lens 22, a third lens 23, a fourth lens 24, and a fifth lens 25, which are sequentially disposed from an object side to an image side along an optical axis, 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 21 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 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 concave 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 material, 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 disposed between the fifth lens 25 and the image plane 27, and the infrared filter 26 filters out the infrared band light entering the lens 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 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
Tables 2 to 2
[ example 3 ]
Fig. 7 is a schematic structural diagram of a five-lens wide-angle lens according to embodiment 3. As can be seen from the figure, the five-piece wide-angle lens of the embodiment includes a first lens 31, an aperture stop 30, a second lens 32, a third lens 33, a fourth lens 34, and a fifth lens 35, which are sequentially disposed from an object side to an image side along an optical axis, 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 31 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 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 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 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, 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 five-lens wide-angle lens further includes an infrared filter 36 disposed between the fifth lens element 35 and the image plane 37, and the infrared filter 36 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.
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
TABLE 3-2
[ example 4 ]
Referring to fig. 10, a schematic structural diagram of a five-piece wide-angle lens of embodiment 4 is shown. As can be seen, the five-lens wide-angle lens of the embodiment includes a first lens 41, an aperture stop 40, a second lens 42, a third lens 43, a fourth lens 44, and a fifth lens 45, which are sequentially disposed from an object side to an image side along an optical axis, 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 41 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 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 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 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, and the image-side surface has at least one inflection point. In addition, the five-piece wide-angle lens further includes an infrared filter 46 disposed between the fifth lens 45 and the image plane 47, and the infrared filter 46 filters out the infrared band light entering the lens 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 4-1, Table 4-2 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
TABLE 4-2
[ example 5 ]
Fig. 13 is a schematic structural diagram of a five-piece wide-angle lens according to embodiment 5. As can be seen, the five-lens wide-angle lens of the embodiment includes a first lens 51, an aperture stop 50, a second lens 52, a third lens 53, a fourth lens 54, and a fifth lens 55, which are sequentially disposed from an object side to an image side along an optical axis, 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 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 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 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 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 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 five-piece wide-angle lens further includes an infrared filter 56 disposed between the fifth lens 55 and the image plane 57, and the infrared filter 56 filters out the infrared band light entering the lens, 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.
Please refer to the following Table 5-1, Table 5-2 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
TABLE 5-2
[ example 6 ]
Fig. 16 is a schematic structural diagram of a five-piece wide-angle lens according to embodiment 6. As can be seen from the figure, the five-lens wide-angle lens of the embodiment includes a first lens 61, an aperture stop 60, a second lens 62, a third lens 63, a fourth lens 64, and a fifth lens 65, which are sequentially disposed from an object side to an image side along an optical axis, 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 61 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 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 concave 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 material, and has at least one inflection point on the image-side surface. In addition, the five-piece wide-angle lens further includes an infrared filter 66 disposed between the fifth lens 65 and the image plane 67, and the infrared filter 66 filters out infrared band light entering the lens to prevent 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 6-2 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
TABLE 6-2
In summary, examples 1 to 6 each satisfy the relationship shown in table 7.
TABLE 7
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 five-piece wide-angle lens, and the electronic photosensitive element is arranged on an imaging surface of the five-piece wide-angle lens.
In the electronic device provided by this embodiment, the five-piece wide-angle lens employed by the image capturing apparatus can have good imaging quality by using a reasonable surface shape for each lens and an optimal range combination of optical parameters of each lens, wherein a ratio of an air distance between the first lens and the second lens on an optical axis to a center thickness of the first lens is reasonably configured, which is beneficial to miniaturization and field angle expansion of the lens, and the shape of the object side surface of the first lens is controlled to make the object side surface of the first lens gentle, which is beneficial to the formation and position arrangement of the first lens.
The five-piece wide-angle lens and the electronic device provided by the invention are described in detail above. The principles and embodiments of the present invention are explained herein using specific examples, which are presented only to assist in understanding the method and its core concepts. It should be noted that, for those skilled in the art, it is possible to make various improvements and modifications to the present invention without departing from the principle of the present invention, and those improvements and modifications also fall within the 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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| CN110850562B (en) * | 2019-11-22 | 2021-07-30 | 诚瑞光学(常州)股份有限公司 | Image pickup optical lens |
| WO2022061823A1 (en) * | 2020-09-27 | 2022-03-31 | 欧菲光集团股份有限公司 | Optical system, lens module and electronic device |
| CN113253429B (en) * | 2021-06-08 | 2021-09-17 | 江西联益光学有限公司 | Wide-angle lens and imaging apparatus |
| CN114355577A (en) * | 2022-01-18 | 2022-04-15 | 浙江舜宇光学有限公司 | Camera lens |
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| CN103576285A (en) * | 2012-07-27 | 2014-02-12 | 大立光电股份有限公司 | Optical image capturing lens assembly |
| CN105607231A (en) * | 2012-06-05 | 2016-05-25 | 大立光电股份有限公司 | Image capturing optical lens assembly |
| CN107621688A (en) * | 2016-07-14 | 2018-01-23 | 今国光学工业股份有限公司 | Minimize wide-angle lens |
| CN108802962A (en) * | 2017-04-28 | 2018-11-13 | 声远精密光学股份有限公司 | Wide-angle imaging lens group |
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| CN105607231A (en) * | 2012-06-05 | 2016-05-25 | 大立光电股份有限公司 | Image capturing optical lens assembly |
| CN103576285A (en) * | 2012-07-27 | 2014-02-12 | 大立光电股份有限公司 | Optical image capturing lens assembly |
| CN107621688A (en) * | 2016-07-14 | 2018-01-23 | 今国光学工业股份有限公司 | Minimize wide-angle lens |
| CN108802962A (en) * | 2017-04-28 | 2018-11-13 | 声远精密光学股份有限公司 | Wide-angle imaging lens group |
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