CN109557640B - Imaging lens and electronic equipment - Google Patents
Imaging lens and electronic equipment Download PDFInfo
- Publication number
- CN109557640B CN109557640B CN201811583775.0A CN201811583775A CN109557640B CN 109557640 B CN109557640 B CN 109557640B CN 201811583775 A CN201811583775 A CN 201811583775A CN 109557640 B CN109557640 B CN 109557640B
- Authority
- CN
- China
- Prior art keywords
- lens
- lens element
- image
- imaging
- paraxial region
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
- G02B13/18—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 an imaging lens, which sequentially comprises a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element and a seventh lens element from an object side to an image side, wherein the first lens element and the fourth lens element both have positive refractive power, the second lens element and the seventh lens element both have negative refractive power, an image side surface of the first lens element is convex at a paraxial region, an object side surface of the third lens element is convex at a paraxial region, an image side surface of the seventh lens element is concave at a paraxial region, and the image side surface of the seventh lens element has at least one inflection point. Each lens of the imaging lens adopts a reasonable surface shape structure and the optimal range combination of optical parameters of each lens, so that the imaging lens has good imaging quality, and the aberration of an off-axis field can be effectively corrected by reasonably configuring the surface shapes of the image side surfaces of the fifth lens and the sixth lens so as to improve the imaging quality. The imaging lens has the characteristics of miniaturization, large aperture, high pixel, high resolution, excellent field angle and the like, and can provide good 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 an imaging lens. The invention also relates to an electronic device.
Background
With the rapid update of related consumer electronics products such as smart phones, portable computers, tablet devices and the like, the market has higher and higher requirements for the quality of optical imaging lenses of electronic products. With the advancement of semiconductor manufacturing technology, the pixel size of the photosensitive device has been reduced, and accordingly, the optical imaging lens has been gradually developed in the high pixel field, so that the requirements for the imaging quality thereof have been increasingly increased.
The conventional lens mounted on a portable electronic product mostly adopts a three-piece or four-piece lens structure, and the existing optical lens cannot meet the requirement of a higher-order photographing system. With the development of technology and the increasing demand of diversified users, five-lens, six-lens and seven-lens structures are gradually emerging in the design of optical imaging lenses for better imaging quality. On the other hand, the large aperture characteristic is one of the currently indispensable elements for providing sufficient illuminance to the image plane of the optical imaging lens. Therefore, an optical imaging lens with a small size and a large aperture and excellent optical characteristics is needed.
Disclosure of Invention
The invention aims to provide an imaging lens which has the characteristics of miniaturization, large aperture, high pixel, high resolution, excellent field angle and the like, can provide good imaging quality and meets the application requirements. The invention also provides electronic equipment.
In order to achieve the purpose, the invention provides the following technical scheme:
an imaging lens assembly 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, a fifth lens element, a sixth lens element and a seventh 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 and the fourth lens element with positive refractive power, the second lens element and the seventh lens element with negative refractive power, the first lens element having a convex image-side surface at a paraxial region, the third lens element having a convex object-side surface at a paraxial region, the seventh lens element having a concave image-side surface at a paraxial region, and the seventh lens element having at least one inflection point on an image-side surface;
and satisfies the following conditional expressions:
0<Yc52/Yc62<1.5；
wherein Yc52Denotes the vertical distance, Yc, of an inflection point on the image-side surface of the fifth lens element from the optical axis62And the vertical distance from an inflection point on the image side surface of the sixth lens to the optical axis is represented.
Preferably, the fifth lens element 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.
Preferably, the following conditional formula is also satisfied: 1<f/R11<2.8, where f denotes the focal length of the imaging lens, R11Representing a radius of curvature of an object-side surface of the first lens.
Preferably, the following conditional formula is also satisfied: -2<(R21+R22)/(R21-R22)<2, 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: 0<R51/R522 or less, wherein R is51Represents a radius of curvature, R, of an object-side surface of the fifth lens52Represents a radius of curvature of the image-side surface of the fifth lens.
Preferably, the following conditional formula is also satisfied: | SAG61+SAG62Less than or equal to 1, wherein SAG61A horizontal displacement distance, SAG, from the intersection point of the object-side surface of the sixth lens and the optical axis to the maximum effective radius of the object-side surface of the sixth lens on the optical axis62And the horizontal displacement distance from the intersection point of the image side surface of the sixth lens and the optical axis to the maximum effective radius position of the image side surface of the sixth lens on the optical axis is represented.
Preferably, the following conditional formula is also satisfied: 0<R11/R22<1, wherein R11Represents a radius of curvature, R, of an object-side surface of the first lens22Representing a radius of curvature of the image side surface of the second lens.
Preferably, the following conditional formula is also satisfied: 0.5< f/ACT <1.5, where f denotes a focal length of the imaging lens, and ACT denotes a sum of thicknesses of the respective lenses of the first to seventh lenses on an optical axis.
Preferably, the following conditional formula is also satisfied: 0.2<CT7/ET7<0.7, wherein CT7Denotes the thickness of the seventh lens element on the optical axis, ET7Representing the edge thickness of the seventh lens.
An electronic device comprises an image pickup device, wherein the image pickup device comprises an electronic photosensitive element and an imaging lens, and the electronic photosensitive element is arranged on an imaging surface of the imaging lens.
In view of the above technical solutions, the imaging lens system provided by the present invention is a seven-lens structure, which 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, a fifth lens element, a sixth lens element and a seventh lens element, wherein an object light sequentially passes through the lens elements and is imaged on an imaging surface located at the image side of the seventh lens element. Each lens of the imaging lens adopts a reasonable surface shape structure and the optimal range combination of optical parameters of each lens, and has good imaging quality, wherein the aberration of an off-axis field can be effectively corrected to improve the imaging quality by reasonably configuring the surface shapes of the image side surfaces of the fifth lens and the sixth lens. The imaging lens provided by the invention has the characteristics of miniaturization, large aperture, high pixel, high resolution, excellent field angle and the like, can provide good imaging quality, and meets 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 an imaging lens provided in embodiment 1 of the present invention;
fig. 2 is a distortion curvature diagram of the imaging lens in embodiment 1 of the present invention;
FIG. 3 is a spherical aberration diagram of the imaging lens in embodiment 1 of the present invention;
fig. 4 is a schematic diagram of an imaging lens provided in embodiment 2 of the present invention;
fig. 5 is a distortion curvature diagram of the imaging lens in embodiment 2 of the present invention;
FIG. 6 is a spherical aberration curve chart of the imaging lens in embodiment 2 of the present invention;
fig. 7 is a schematic diagram of an imaging lens according to embodiment 3 of the present invention;
FIG. 8 is a distortion curvature diagram of the imaging lens in embodiment 3 of the present invention;
FIG. 9 is a spherical aberration diagram of the imaging lens in embodiment 3 of the present invention;
fig. 10 is a schematic view of an imaging lens system according to embodiment 4 of the present invention;
fig. 11 is a distortion curvature diagram of the imaging lens in embodiment 4 of the present invention;
FIG. 12 is a spherical aberration diagram of the imaging lens in embodiment 4 of the present invention;
fig. 13 is a schematic view of an imaging lens system according to embodiment 5 of the present invention;
FIG. 14 is a distortion curvature diagram of the imaging lens in embodiment 5 of the present invention;
FIG. 15 is a spherical aberration diagram of the imaging lens in embodiment 5 of the present invention;
fig. 16 is a schematic view of an imaging lens provided in embodiment 6 of the present invention;
fig. 17 is a distortion curvature diagram of the imaging lens in embodiment 6 of the present invention;
FIG. 18 is a spherical aberration diagram of the imaging lens in embodiment 6 of the present invention;
fig. 19 is a schematic view of an imaging lens according to embodiment 7 of the present invention;
FIG. 20 is a distortion curvature diagram of the imaging lens in embodiment 7 of the present invention;
FIG. 21 is a spherical aberration chart of the imaging lens in embodiment 7 of the present invention;
FIG. 22 shows Yc in the imaging lens system according to embodiment 1 of the invention52A schematic diagram of (a);
FIG. 23 shows Yc in the imaging lens system according to embodiment 1 of the invention62A schematic diagram of (a);
FIG. 24 shows SAG in the imaging lens according to embodiment 1 of the invention61And SAG62Schematic 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 an imaging lens, which sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh 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 imaging lens also comprises an imaging surface positioned at the image side of the seventh lens and an infrared filter arranged between the seventh lens and the imaging surface, and the infrared filter does not influence the focal length of the imaging lens.
The first lens element with positive refractive power has a convex object-side surface at paraxial region, and can adjust its positive refractive power configuration to shorten total track length of the imaging lens assembly.
The second lens element with negative refractive power can correct aberration generated by the first lens element, and has a concave object-side surface at paraxial region and a concave image-side surface at paraxial region, thereby correcting astigmatism.
The third lens element with positive refractive power can effectively distribute the refractive power of the first lens element, thereby reducing the sensitivity of the imaging lens assembly. The third lens element has a convex object-side surface at the paraxial region and a convex image-side surface at the paraxial region, which helps to correct spherical aberration and effectively improve image quality.
The fourth lens element with positive refractive power can provide light converging capability of the imaging lens, and is beneficial to shortening the total length of the imaging lens. The fourth lens element has a concave object-side surface at a paraxial region thereof for providing a main divergent power to balance the aberration generated by controlling the total length, and a convex image-side surface at a paraxial region thereof.
The fifth lens element with refractive power has a convex object-side surface at paraxial region and a change from convex to concave from paraxial region to edge, and has a concave image-side surface at paraxial region and a change from concave to convex from paraxial region to edge, thereby improving high-order aberration and resolving power of the imaging lens assembly.
The sixth lens element with refractive power has a convex object-side surface at paraxial region and a concave image-side surface at paraxial region, so that the seventh lens element can be used for controlling the back focal length to avoid the size of the device from being reduced due to the oversize lens element. At least one of the object-side surface and the image-side surface of the sixth lens element includes at least one inflection point, and the peripheral aberration of the sixth lens element is corrected by the arrangement of the inflection points while the rear focal length is compressed, thereby achieving a balance between image quality and volume.
The seventh lens element with negative refractive power has a concave image-side surface at paraxial region, which is helpful for making the principal point of the imaging lens effectively away from the image-side surface to enhance the reduction of the back focal length thereof, thereby reducing the total track length of the imaging lens and achieving the purpose of miniaturization; in addition, the image side surface of the seventh lens element has at least one inflection point, which can effectively suppress the angle of the light rays of the off-axis field incident on the image sensor, and preferably correct the aberration of the off-axis field.
By reasonably controlling the positive and negative distribution of the refractive power of each lens in the imaging lens, the low-order aberration of the lens can be effectively balanced and controlled, the tolerance sensitivity of the lens can be reduced, and the miniaturization of the imaging lens is favorably ensured. The interval can be arranged between any two adjacent lenses of the imaging lens, which is beneficial to the assembly of the lenses and improves the manufacturing yield.
The imaging lens meets the condition 0 by reasonably configuring the surface shapes of the image side surfaces of the fifth lens and the sixth lens<Yc52/Yc62<1.5 wherein Yc52Denotes the vertical distance, Yc, of an inflection point on the image-side surface of the fifth lens element from the optical axis62The vertical distance from the point of inflection on the image side surface of the sixth lens to the optical axis is represented, and the aberration of the off-axis field of the imaging lens can be effectively corrected to improve the imaging quality. Preferably, the following conditional expressions are satisfied: 0.5<Yc52/Yc62<1.0. Therefore, the imaging lens has the characteristics of miniaturization, large aperture, high pixel, high resolution, large field angle and the like, can provide good imaging quality, and meets the application requirements.
Preferably, the imaging lens further satisfies the following conditional expression: 1<f/R11<2.8, where f denotes the focal length of the imaging lens, R11Representing a radius of curvature of an object-side surface of the first lens. The condition is satisfied to effectively control the curvature strength of the object side lens surface of the imaging lensThe problem that the structural design is difficult and the aesthetic degree is influenced due to the fact that the surface of the imaging lens in the electronic device is provided with too large holes is avoided.
Preferably, the imaging lens further satisfies the following conditional expression: -2<(R21+R22)/(R21-R22)<2, 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 condition is satisfied, so that the curvature radius of the object-side surface and the image-side surface of the second lens is in a better range, and the aberration can be better corrected.
Preferably, the imaging lens further satisfies the following conditional expression: 0<R51/R522 or less, wherein R is51Represents a radius of curvature, R, of an object-side surface of the fifth lens52Represents a radius of curvature of the image-side surface of the fifth lens. The curvature radius of the fifth lens with the reverse curvature point design can be in a reasonable range by meeting the condition, and the possibility that the surface shape is too large to bend due to too small or too large curvature, so that the forming is difficult or the light ray total reflection is caused is avoided.
Preferably, the imaging lens further satisfies the following conditional expression: | SAG61+SAG62Less than or equal to 1, wherein SAG61A horizontal displacement distance (SAG if horizontal displacement is towards the image side) representing the distance from the intersection point of the object-side surface of the sixth lens and the optical axis to the maximum effective radius position of the object-side surface of the sixth lens61Is a positive value; if the horizontal displacement is towards the object side, SAG61Negative value), SAG62A horizontal displacement distance (SAG if horizontal displacement is towards the image side) representing the distance from the intersection point of the image side surface of the sixth lens and the optical axis to the maximum effective radius position of the image side surface of the sixth lens62Is a positive value; SAG if the horizontal displacement is towards the object side62A negative value). When the condition is met, the curvature of the object image side surface of the sixth lens can be controlled well, the curvature is too small to guide light to raise the image height, and the curvature is too large to cause the lens to be bent in shape, so that the forming difficulty is high, and the process is difficult to achieve.
Preferably, the imaging lens further satisfies the following conditional expression: 0<R11/R22<1,Wherein R is11Represents a radius of curvature, R, of an object-side surface of the first lens22Representing a radius of curvature of the image side surface of the second lens. The curvature radius R of the object side surface of the first lens can be reasonably controlled by satisfying the condition11And radius of curvature R of image-side surface of second lens22The ratio range of (2) is favorable for the imaging lens to better realize the deflection of the light path.
Preferably, the imaging lens further satisfies the following conditional expression: 0.5< f/ACT <1.5, where f denotes a focal length of the imaging lens, and ACT denotes a sum of thicknesses of the respective lenses of the first to seventh lenses on an optical axis. The central thickness of each lens can be reasonably distributed when the condition is met, the light deflection tends to be mild, and the sensitivity of the imaging lens is reduced; meanwhile, astigmatism, distortion and chromatic aberration of the imaging lens are reduced, and resolving power is improved.
Preferably, the imaging lens further satisfies the following conditional expression: 0.2<CT7/ET7<0.7, wherein CT7Denotes the thickness of the seventh lens element on the optical axis, ET7Representing the edge thickness of the seventh lens. The structural size of the seventh lens can be reasonably adjusted when the condition is met, and the system distortion can be balanced while the size of the lens is reduced and good processability is kept.
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 optical imaging lens system provided by the present invention, if the refractive power or the focal length of the lens element does not define the position of the region, 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 optical imaging lens, in a case of from left to right from an object side to an image side, a convex object side of the lens means that any point on a passing surface of the object side of the lens is a tangent plane, the surface is always on the right of the tangent plane, and the curvature radius of the surface is positive, otherwise, the object side of the lens is a concave surface, and the curvature radius of the surface 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. The paraxial region refers to a region near the optical axis. In the optical imaging lens provided by the invention, if the lens surface is a convex surface and the position of the convex surface is not defined, the convex surface can be positioned at the position of the lens surface close to 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 optical imaging lens, the lens can be made of plastic, and when the lens is made of plastic, the production cost can be effectively reduced. In addition, the object-side surface and the image-side surface of each lens can be Aspheric Surfaces (ASP), the ASP can be easily manufactured into shapes other than spherical surfaces, more control variables are obtained to reduce aberration, and the number of the lenses is further reduced, so that the total length of the optical imaging lens can be effectively reduced.
In addition, in the imaging 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 front aperture, i.e., the aperture is disposed between the subject and the first lens. The front arrangement of the aperture can enable the exit pupil of the imaging lens to generate a longer distance with the imaging surface, so that the imaging lens has a telecentric effect, and the efficiency of receiving images by a CCD or a CMOS of the electronic photosensitive element can be increased.
The imaging lens of the present invention will be described in detail below with 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 an imaging lens of embodiment 1 is shown. As can be seen, the imaging lens of this embodiment includes an aperture stop 100, a first lens element 110, a second lens element 120, a third lens element 130, a fourth lens element 140, a fifth lens element 150, a sixth lens element 160, and a seventh lens element 170, which are sequentially disposed along an optical axis from an object side to an image side, 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 110 with positive refractive power has a convex object-side surface 111 at a paraxial region and a convex image-side surface 112 at a paraxial region, and is made of plastic material. The second lens element 120 with negative refractive power has a concave object-side surface 121 at a paraxial region and a concave image-side surface 122 at a paraxial region, and is made of plastic material. The third lens element 130 with positive refractive power has a convex object-side surface 131 at a paraxial region and a convex image-side surface 132 at a paraxial region, and is made of plastic material. The fourth lens element 140 with positive refractive power has a concave object-side surface 141 at a paraxial region and a convex image-side surface 142 at a paraxial region, and is made of plastic material. The fifth lens element 150 with positive refractive power is made of plastic, and has an object-side surface 151 being convex at a paraxial region and having a convex-to-concave variation from the paraxial region to the peripheral region, and an image-side surface 152 being concave at the paraxial region and having a concave-to-convex variation from the paraxial region to the peripheral region. The sixth lens element 160 with positive refractive power has a convex object-side surface 161 at a paraxial region and a concave image-side surface 162 at a paraxial region, and is made of plastic. The seventh lens element 170 with negative refractive power has a concave object-side surface 171 at a paraxial region and a concave image-side surface 172 at a paraxial region, and is made of plastic material. In addition, the imaging lens further includes an infrared filter 180 disposed between the seventh lens 170 and the imaging surface 190, and the infrared filter 180 filters out the infrared band light entering the optical lens 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 imaging lens of the present embodiment satisfying the conditional expressions are shown in table 8. In addition, referring to fig. 22 and 23, the vertical distance Yc from the inflection point 1521 on the image-side surface of the fifth lens element to the optical axis52As shown in fig. 22The vertical distance Yc from the inflection point 1621 on the image-side surface of the sixth lens to the optical axis62As shown in fig. 23. Referring to FIG. 24, the horizontal displacement distance SAG from the intersection point of the object-side surface 161 of the sixth lens and the optical axis to the position of the maximum effective radius of the object-side surface 161 of the sixth lens on the optical axis61As shown in fig. 24, the horizontal displacement distance SAG from the intersection point of the sixth lens image-side surface 162 and the optical axis to the maximum effective radius position of the sixth lens image-side surface 162 on the optical axis62As shown in fig. 24.
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 imaging lens, Fno is the aperture value, FOV is the maximum field angle, and surfaces 0-18 sequentially represent the surfaces from the object side to the image side. Surfaces 1-15 sequentially represent aperture stop 100, first lens object side surface 111, first lens image side surface 112, second lens object side surface 121, second lens image side surface 122, third lens object side surface 131, third lens image side surface 132, fourth lens object side surface 141, fourth lens image side surface 142, fifth lens object side surface 151, fifth lens image side surface 152, sixth lens object side surface 161, sixth lens image side surface 162, seventh lens object side surface 171, and seventh lens image side surface 172.
TABLE 1-1
Each lens in the imaging 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-A16 represent the aspherical surface coefficients of 4 th to 16 th orders, respectively. Distortion field curvature graphs and spherical aberration graphs of the imaging lens of the embodiment are respectively shown in fig. 2 and fig. 3, wherein the wavelength in the distortion field curvature graphs is 0.555 μm, and the wavelength in the spherical aberration graphs 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 view of the imaging lens, the distortion curvature of field and the spherical aberration curve chart of the embodiments, and the definition of the data in the tables is the same as that of tables 1-1 and 1-2 of embodiment 1.
Tables 1 to 2
[ example 2 ]
Referring to fig. 4, a schematic structural diagram of an imaging lens of embodiment 2 is shown. As can be seen, the imaging lens of this embodiment includes an aperture stop 200, a first lens element 210, a second lens element 220, a third lens element 230, a fourth lens element 240, a fifth lens element 250, a sixth lens element 260, and a seventh lens element 270 arranged in order 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 both the object-side surface and the image-side surface of each lens element are aspheric.
The first lens element 210 with positive refractive power has a convex object-side surface 211 at a paraxial region and a convex image-side surface 212 at a paraxial region, and is made of plastic material. The second lens element 220 with negative refractive power has a concave object-side surface 221 at a paraxial region and a concave image-side surface 222 at a paraxial region, and is made of plastic material. The third lens element 230 with positive refractive power has a convex object-side surface 231 at a paraxial region and a convex image-side surface 232 at a paraxial region, and is made of plastic material. The fourth lens element 240 with positive refractive power has a concave object-side surface 241 at a paraxial region and a convex image-side surface 242 at a paraxial region, and is made of plastic material. The fifth lens element 250 with positive refractive power is made of plastic, and has a convex object-side surface 251 at a paraxial region and a concave-convex transition from the paraxial region to the peripheral region, and a concave image-side surface 252 at the paraxial region and a convex-concave transition from the paraxial region to the peripheral region. The sixth lens element 260 with positive refractive power has a convex object-side surface 261 and a concave image-side surface 262. The seventh lens element 270 with negative refractive power has a concave object-side surface 271 at a paraxial region and a concave image-side surface 272 at a paraxial region, and is made of plastic material. In addition, the imaging lens further includes an infrared filter 280 disposed between the seventh lens element 270 and the imaging surface 290, and the infrared filter 280 filters 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 2-1, Table 2-2 and Table 8. The corresponding distortion field curves and spherical aberration plots are shown in fig. 5 and 6, respectively.
TABLE 2-1
Tables 2 to 2
[ example 3 ]
Referring to fig. 7, a schematic structural diagram of an imaging lens of embodiment 3 is shown. As can be seen, the imaging lens of this embodiment includes an aperture stop 300, a first lens element 310, a second lens element 320, a third lens element 330, a fourth lens element 340, a fifth lens element 350, a sixth lens element 360 and a seventh lens element 370, which are sequentially disposed along an optical axis 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 310 with positive refractive power has a convex object-side surface 311 at a paraxial region and a convex image-side surface 312 at a paraxial region, and is made of plastic material. The second lens element 320 with negative refractive power has a concave object-side surface 321 at a paraxial region and a concave image-side surface 322 at a paraxial region, and is made of plastic material. The third lens element 330 with positive refractive power has a convex object-side surface 331 at a paraxial region and a convex image-side surface 332 at a paraxial region, and is made of plastic material. The fourth lens element 340 with positive refractive power has a concave object-side surface 341 at a paraxial region and a convex image-side surface 342 at a paraxial region, and is made of plastic material. The fifth lens element 350 with positive refractive power is made of plastic, and has a convex object-side surface 351 at a paraxial region and a concave-convex change from the paraxial region to the peripheral region, and a concave image-side surface 352 at the paraxial region and a concave-convex change from the paraxial region to the peripheral region. The sixth lens element 360 with negative refractive power has a convex object-side surface 361 at a paraxial region and a concave image-side surface 362 at a paraxial region, and is made of plastic. The seventh lens element 370 with negative refractive power is made of plastic, and has a concave object-side surface 371 at a paraxial region and a concave image-side surface 372 at a paraxial region. In addition, the imaging lens further includes an infrared filter 380 disposed between the seventh lens element 370 and the imaging surface 390, and the infrared filter 380 filters the infrared band light entering the optical lens assembly to prevent the infrared light from irradiating the light sensing 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 8. The corresponding distortion field curves and spherical aberration plots are shown in fig. 8 and 9, respectively.
TABLE 3-1
TABLE 3-2
[ example 4 ]
Referring to fig. 10, a schematic structural diagram of an imaging lens of embodiment 4 is shown. As can be seen, the imaging lens of this embodiment includes an aperture stop 400, a first lens element 410, a second lens element 420, a third lens element 430, a fourth lens element 440, a fifth lens element 450, a sixth lens element 460, and a seventh lens element 470, which are sequentially disposed from an object side to an image side along an optical axis, 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 410 with positive refractive power has a convex object-side surface 411 and a convex image-side surface 412. The second lens element 420 with negative refractive power has a concave object-side surface 421 at a paraxial region and a concave image-side surface 422 at the paraxial region, and is made of plastic material. The third lens element 430 with positive refractive power has a convex object-side surface 431 at a paraxial region and a convex image-side surface 432 at a paraxial region, and is made of plastic material. The fourth lens element 440 with positive refractive power has a concave object-side surface 441 at a paraxial region and a convex image-side surface 442 at a paraxial region, and is made of plastic material. The fifth lens element 450 with positive refractive power is made of plastic, and has an object-side surface 451 being convex at a paraxial region and changing from convex at a paraxial region to concave at a peripheral region, and an image-side surface 452 being concave at a paraxial region and changing from concave at a paraxial region to convex at a peripheral region. The sixth lens element 460 with negative refractive power has a convex object-side surface 461 and a concave image-side surface 462. The seventh lens element 470 with negative refractive power has a concave object-side surface 471 at a paraxial region and a concave image-side surface 472 at a paraxial region, and is made of plastic material. In addition, the imaging lens further includes an infrared filter 480 disposed between the seventh lens 470 and the imaging surface 490, and the infrared band light entering the optical lens assembly is filtered by the infrared filter 480, 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 4-1, Table 4-2 and Table 8. The corresponding distortion plots and spherical aberration plots are shown in fig. 11 and 12, respectively.
TABLE 4-1
TABLE 4-2
[ example 5 ]
Referring to fig. 13, a schematic structural diagram of an imaging lens of embodiment 5 is shown. As can be seen, the imaging lens of this embodiment includes, in order from an object side to an image side along an optical axis, an aperture stop 500, a first lens element 510, a second lens element 520, a third lens element 530, a fourth lens element 540, a fifth lens element 550, a sixth lens element 560, and a seventh lens element 570, 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.
The first lens element 510 with positive refractive power has a convex object-side surface 511 at a paraxial region and a convex image-side surface 512 at a paraxial region, and is made of plastic material. The second lens element 520 with negative refractive power has a concave object-side surface 521 at a paraxial region and a concave image-side surface 522 at a paraxial region, and is made of plastic. The third lens element 530 with positive refractive power has a convex object-side surface 531 at a paraxial region and a convex image-side surface 532 at a paraxial region. The fourth lens element 540 with positive refractive power has a concave object-side surface 541 at a paraxial region and a convex image-side surface 542 at a paraxial region, and is made of plastic material. The fifth lens element 550 with negative refractive power is made of plastic material, and has an object-side surface 551 which is convex at paraxial region and has a change from convex at paraxial region to concave at peripheral region, and an image-side surface 552 which is concave at paraxial region and has a change from concave at paraxial region to convex at peripheral region. The sixth lens element 560 with positive refractive power has a convex object-side surface 561 at a paraxial region and a concave image-side surface 562 at a paraxial region, and is made of plastic material. The seventh lens element 570 with negative refractive power has a concave object-side surface 571 at a paraxial region and a concave image-side surface 572 at the paraxial region, and is made of plastic material. In addition, the imaging lens further includes an infrared filter 580 disposed between the seventh lens element 570 and the imaging surface 590, and the infrared filter 580 filters out the infrared band light entering the optical lens assembly, so as to prevent the infrared light from irradiating the light sensing 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 8. The corresponding distortion plots and spherical aberration plots are shown in fig. 14 and 15, respectively.
TABLE 5-1
TABLE 5-2
[ example 6 ]
Referring to fig. 16, a schematic structural diagram of an imaging lens of embodiment 6 is shown. As can be seen, the imaging lens of this embodiment includes, in order from an object side to an image side along an optical axis, an aperture stop 600, a first lens element 610, a second lens element 620, a third lens element 630, a fourth lens element 640, a fifth lens element 650, a sixth lens element 660, and a seventh lens element 670, where each lens element 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 lens element are aspheric.
The first lens element 610 with positive refractive power has a convex object-side surface 611 at a paraxial region and a convex image-side surface 612 at a paraxial region, and is made of plastic material. The second lens element 620 with negative refractive power has a concave object-side surface 621 at a paraxial region and a concave image-side surface 622 at a paraxial region, and is made of plastic material. The third lens element 630 with positive refractive power has a convex object-side surface 631 and a convex image-side surface 632. The fourth lens element 640 with positive refractive power has a concave object-side surface 641 at a paraxial region and a convex image-side surface 642 at a paraxial region, and is made of plastic material. The fifth lens element 650 with positive refractive power is made of plastic, and has an object-side surface 651 being convex at a paraxial region and changing from convex to concave at a paraxial region, and an image-side surface 652 being concave at a paraxial region and changing from concave to convex at a paraxial region. The sixth lens element 660 with negative refractive power has a convex object-side surface 661 at a paraxial region and a concave image-side surface 662 at a paraxial region, and is made of plastic material. The seventh lens element 670 with negative refractive power has a concave object-side surface 671 at a paraxial region and a concave image-side surface 672 at a paraxial region, and is made of plastic. In addition, the imaging lens further includes an infrared filter 680 disposed between the seventh lens 670 and the imaging surface 690, and the infrared filter 680 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 6-1, Table 6-2 and Table 8. The corresponding distortion field curves and spherical aberration plots are shown in fig. 17 and 18, respectively.
TABLE 6-1
TABLE 6-2
[ example 7 ]
Referring to fig. 19, a schematic structural diagram of an imaging lens of embodiment 7 is shown. As can be seen, the imaging lens of this embodiment includes, in order from an object side to an image side along an optical axis, an aperture stop 700, a first lens element 710, a second lens element 720, a third lens element 730, a fourth lens element 740, a fifth lens element 750, a sixth lens element 760 and a seventh lens element 770, where each lens element 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 lens element are aspheric.
The first lens element 710 with positive refractive power has a convex object-side surface 711 at a paraxial region and a convex image-side surface 712 at a paraxial region, and is made of plastic material. The second lens element 720 with negative refractive power has a concave object-side surface 721 at a paraxial region and a concave image-side surface 722 at a paraxial region, and is made of plastic material. The third lens element 730 with positive refractive power has a convex object-side surface 731 at a paraxial region and a convex image-side surface 732 at a paraxial region, and is made of plastic material. The fourth lens element 740 with positive refractive power is made of plastic, and has a concave object-side surface 741 at a paraxial region and a convex image-side surface 742 at a paraxial region. The fifth lens element 750 with positive refractive power is made of plastic, and has an object-side surface 751 being convex at a paraxial region and having a convex-to-concave transition from the paraxial region to the peripheral region, and an image-side surface 752 being concave at the paraxial region and having a concave-to-convex transition from the paraxial region to the peripheral region. The sixth lens element 760 with positive refractive power has a convex object-side surface 761 at a paraxial region and a concave image-side surface 762 at a paraxial region, and is made of plastic material. The seventh lens element 770 with negative refractive power is made of plastic material, and has a concave object-side surface 771 at paraxial region and a concave image-side surface 772 at paraxial region. In addition, the imaging lens further includes an infrared filter 780 disposed between the seventh lens 770 and the imaging surface 790, and the infrared filter 780 filters 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 7-1, Table 7-2 and Table 8. The corresponding distortion plots and spherical aberration plots are shown in fig. 20 and 21, respectively.
TABLE 7-1
TABLE 7-2
In summary, examples 1 to 7 each satisfy the relationship shown in table 8.
TABLE 8
| Conditions/examples | Example 1 | Example 2 | Example 3 | Example 4 | Example 5 | Example 6 | Example 7 |
| Yc52/Yc62 | 0.93 | 0.38 | 0.90 | 0.12 | 0.82 | 0.40 | 1.23 |
| f/R11 | 1.61 | 1.01 | 1.69 | 1.58 | 1.70 | 1.58 | 1.68 |
| (R21+R22)/(R21-R22) | 0.30 | 0.92 | -0.79 | 0.92 | 0.92 | 0.91 | 0.93 |
| R51/R52 | 0.71 | 0.04 | 0.40 | 0.01 | 2.00 | 0.05 | 0.71 |
| |SAG61+SAG62| | 0.50 | 0.72 | 0.72 | 0.79 | 0.75 | 0.01 | 1.00 |
| R11/R22 | 0.51 | 0.97 | 0.10 | 0.75 | 0.72 | 0.76 | 0.77 |
| f/ACT | 1.07 | 1.00 | 1.09 | 1.05 | 1.08 | 1.08 | 1.48 |
| CT7/ET7 | 0.46 | 0.29 | 0.56 | 0.43 | 0.43 | 0.48 | 0.56 |
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 imaging lens, and the electronic photosensitive element is arranged on an imaging surface of the imaging lens.
In the electronic device provided by the embodiment, the imaging lens adopted by the imaging device is of a seven-piece lens structure, so that the electronic device can have the characteristics of miniaturization, large aperture, high pixel, high resolution, excellent field angle and the like, can provide good imaging quality, and meets the application requirements.
Claims (9)
1. An imaging lens assembly 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, a fifth lens element, a sixth lens element and a seventh 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 and the fourth lens element both have positive refractive power, the second lens element and the seventh lens element both have negative refractive power, the first lens element has a convex image-side surface at a paraxial region, the third lens element has a convex object-side surface at a paraxial region, the seventh lens element has a concave image-side surface at a paraxial region, and the seventh lens element has at least one inflection point on an image-side surface thereof;
and satisfies the following conditional expressions:
0<Yc52/Yc62<1.5；
wherein Yc52Denotes the vertical distance, Yc, of an inflection point on the image-side surface of the fifth lens element from the optical axis62And the vertical distance from an inflection point on the image side surface of the sixth lens to the optical axis is represented.
2. The imaging lens according to claim 1, characterized in that the following conditional expression is further satisfied: 1<f/R11<2.8, where f denotes the focal length of the imaging lens, R11Representing a radius of curvature of an object-side surface of the first lens.
3. The imaging lens according to claim 1, characterized in that the following conditional expression is further satisfied: -2<(R21+R22)/(R21-R22)<2, 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.
4. The imaging lens according to claim 1, characterized in that the following conditional expression is further satisfied: 0<R51/R52≤2，Wherein R is51Represents a radius of curvature, R, of an object-side surface of the fifth lens52Represents a radius of curvature of the image-side surface of the fifth lens.
5. The imaging lens according to claim 1, characterized in that the following conditional expression is further satisfied: | SAG61+SAG62Less than or equal to 1, wherein SAG61A horizontal displacement distance, SAG, from the intersection point of the object-side surface of the sixth lens and the optical axis to the maximum effective radius of the object-side surface of the sixth lens on the optical axis62And the horizontal displacement distance from the intersection point of the image side surface of the sixth lens and the optical axis to the maximum effective radius position of the image side surface of the sixth lens on the optical axis is represented.
6. The imaging lens according to claim 1, characterized in that the following conditional expression is further satisfied: 0<R11/R22<1, wherein R11Represents a radius of curvature, R, of an object-side surface of the first lens22Representing a radius of curvature of the image side surface of the second lens.
7. The imaging lens according to claim 1, characterized in that the following conditional expression is further satisfied: 0.5< f/ACT <1.5, where f denotes a focal length of the imaging lens, and ACT denotes a sum of thicknesses of the respective lenses of the first to seventh lenses on an optical axis.
8. The imaging lens according to claim 1, characterized in that the following conditional expression is further satisfied: 0.2<CT7/ET7<0.7, wherein CT7Denotes the thickness of the seventh lens element on the optical axis, ET7Representing the edge thickness of the seventh lens.
9. An electronic apparatus characterized by comprising an image pickup device including an electron-sensitive element provided on an imaging surface of an imaging lens and the imaging lens according to any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811583775.0A CN109557640B (en) | 2018-12-24 | 2018-12-24 | Imaging lens and electronic equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811583775.0A CN109557640B (en) | 2018-12-24 | 2018-12-24 | Imaging lens and electronic equipment |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109557640A CN109557640A (en) | 2019-04-02 |
| CN109557640B true CN109557640B (en) | 2021-06-18 |
Family
ID=65870890
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811583775.0A Active CN109557640B (en) | 2018-12-24 | 2018-12-24 | Imaging lens and electronic equipment |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN109557640B (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111239965A (en) * | 2019-10-15 | 2020-06-05 | 玉晶光电(厦门)有限公司 | Optical imaging lens |
| CN114895433A (en) * | 2021-08-24 | 2022-08-12 | 三星电机株式会社 | Optical imaging system |
| CN113608338B (en) * | 2021-10-11 | 2022-04-01 | 江西联创电子有限公司 | Optical imaging lens and imaging apparatus |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107490839A (en) * | 2014-08-01 | 2017-12-19 | 大立光电股份有限公司 | Image capturing optical lens assembly, image capturing device and electronic device |
| CN206876947U (en) * | 2017-04-17 | 2018-01-12 | 浙江舜宇光学有限公司 | Pick-up lens |
| CN108279471A (en) * | 2017-01-06 | 2018-07-13 | 先进光电科技股份有限公司 | Optical imaging system |
| CN108957688A (en) * | 2017-05-22 | 2018-12-07 | 先进光电科技股份有限公司 | Optical imaging system |
| CN109061838A (en) * | 2018-09-12 | 2018-12-21 | 广东旭业光电科技股份有限公司 | A kind of optical imaging lens and electronic equipment |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| TWI534467B (en) * | 2015-02-17 | 2016-05-21 | 大立光電股份有限公司 | Photographing system, image capturing unit and electronic device |
-
2018
- 2018-12-24 CN CN201811583775.0A patent/CN109557640B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107490839A (en) * | 2014-08-01 | 2017-12-19 | 大立光电股份有限公司 | Image capturing optical lens assembly, image capturing device and electronic device |
| CN108279471A (en) * | 2017-01-06 | 2018-07-13 | 先进光电科技股份有限公司 | Optical imaging system |
| CN206876947U (en) * | 2017-04-17 | 2018-01-12 | 浙江舜宇光学有限公司 | Pick-up lens |
| CN108957688A (en) * | 2017-05-22 | 2018-12-07 | 先进光电科技股份有限公司 | Optical imaging system |
| CN109061838A (en) * | 2018-09-12 | 2018-12-21 | 广东旭业光电科技股份有限公司 | A kind of optical imaging lens and electronic equipment |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109557640A (en) | 2019-04-02 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109765679B (en) | Optical imaging lens and electronic device | |
| USRE49703E1 (en) | Compact optical system, image capturing unit and electronic device | |
| CN109061838B (en) | Optical imaging lens and electronic equipment | |
| US8804252B2 (en) | Optical image capturing lens system | |
| US8508863B2 (en) | Image lens system | |
| CN109270666B (en) | Optical imaging lens and electronic equipment | |
| US10025072B2 (en) | Imaging lens assembly, image capturing unit and electronic device | |
| US8675289B2 (en) | Image capturing optical lens system | |
| CN109375351B (en) | Camera lens group and electronic equipment | |
| US8649112B2 (en) | Image lens assembly | |
| US8462449B2 (en) | Optical lens assembly | |
| US9036270B2 (en) | Optical lens system | |
| CN109765678B (en) | Camera lens and electronic equipment | |
| CN109270663B (en) | Optical imaging lens and camera device using same | |
| CN109270665B (en) | Optical imaging lens and electronic device | |
| CN110187483B (en) | Wide-angle lens and electronic equipment | |
| US8654454B2 (en) | Thin optical lens assembly | |
| US9995908B2 (en) | Optical imaging lens system, image capturing unit and electronic device | |
| CN110187473B (en) | Five-piece type wide-angle lens and electronic equipment | |
| US8390944B2 (en) | Photographing optical lens assembly | |
| CN109557640B (en) | Imaging lens and electronic equipment | |
| CN110488469B (en) | Optical lens and electronic equipment | |
| CN112764201B (en) | Optical system, camera module and electronic equipment | |
| CN113625423A (en) | Imaging system, camera module and electronic equipment | |
| CN111413783A (en) | Optical imaging lens and electronic device |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |