CN109100855B - Optical imaging lens group and electronic equipment - Google Patents
Optical imaging lens group and electronic equipment Download PDFInfo
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- CN109100855B CN109100855B CN201811037088.9A CN201811037088A CN109100855B CN 109100855 B CN109100855 B CN 109100855B CN 201811037088 A CN201811037088 A CN 201811037088A CN 109100855 B CN109100855 B CN 109100855B
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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
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
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Abstract
The invention discloses an optical imaging lens group, which comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are arranged from an object side to an image side along an optical axis: the first lens element with positive refractive power has a convex object-side surface, the second lens element with negative refractive power, the third lens element with positive refractive power, and the fourth lens element with negative refractive power; the fifth lens element with refractive power has a convex object-side surface at paraxial region and a concave image-side surface at paraxial region, and has at least one inflection point; the sixth lens element with negative refractive power has a concave image-side surface at paraxial region and has at least one inflection point. The optical imaging lens group optimizes the ratio relation between the thickness of the first lens and the total length of the lens group, and limits the relation between the effective diameters of the image side surfaces of the first lens and the second lens, so that the total length of the lens group can be shortened on the premise of providing good imaging quality, and the head of the lens is miniaturized. The invention also provides electronic equipment.
Description
Technical Field
The invention relates to the technical field of optical imaging devices, in particular to an optical imaging lens group. 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. The development trend of mobile portable electronic devices is light and thin, which makes the demand for miniaturization of camera modules applied to electronic devices higher and higher. With the advancement of semiconductor manufacturing technology, the size of the photosensitive device is shrinking, and accordingly, the optical imaging lens loaded in the camera module has a thinner thickness and a smaller size, which becomes a development requirement of the optical imaging lens. In addition, for some electronic devices, such as smart phones, the ultra-narrow-frame and frameless full-screen design is adopted, and the size of an optical lens head used by the camera module is required to be smaller.
In the prior art, a light and thin optical imaging lens mostly adopts a four-piece or five-piece lens structure, but the lens group with the structure has limitations in the aspects of refractive power distribution, aberration astigmatism correction, sensitivity distribution and the like, and cannot further meet the imaging requirements of higher specifications. Therefore, it is an urgent need in the art to provide an optical imaging lens that can effectively shorten the total length of the optical imaging lens to achieve a light and thin profile and a small lens head on the premise of good imaging quality.
Disclosure of Invention
The invention aims to provide an optical imaging lens group, which can effectively shorten the total length of the lens group on the premise of providing good imaging quality, achieve light and thin, and can meet the application requirements by miniaturizing a lens head. The invention also provides electronic equipment.
In order to achieve the purpose, the invention provides the following technical scheme:
an optical imaging lens group comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens which are arranged in sequence from an object side to an image side along an optical axis, wherein each lens is provided with an object side surface facing the object side and an image side surface facing the image side, and the object side surface and the image side surface of each lens are both aspheric surfaces, wherein:
the first lens element with positive refractive power has a convex object-side surface;
the second lens element with negative refractive power;
the third lens element with positive refractive power;
the fourth lens element with negative refractive power;
the fifth lens element with 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;
the sixth lens element with negative refractive power has a concave image-side surface at the paraxial region and at least one inflection point on the image-side surface;
any two adjacent lenses have a space, and the lenses do not move relatively, and the optical imaging lens group further comprises an aperture located on one side of the first lens facing the object space;
and satisfies the following conditional expressions:
0.1<CT1/TTL<0.3；
0.1<DM12-DM22<0.7；
wherein, CT1Represents the thickness of the first lens on the optical axis, TTL represents the distance between the object side surface of the first lens and the imaging surface of the optical imaging lens group on the optical axis, DM12Representing the effective diameter, DM, of the image-side surface of said first lens22Representing the effective diameter of the image side surface of the second lens.
Preferably, the third lens element has a convex object-side surface at a paraxial region and a convex image-side surface at a paraxial region.
Preferably, the following conditional formula is also satisfied: 2.0<(R21+R22)/(R21-R22)<6.0 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: 1.8<(CT3+CT4)/T34<8, wherein CT3Representing the thickness of said third lens on the optical axis, CT4Represents the thickness of the fourth lens on the optical axis, T34Represents an air space on an optical axis between the third lens and the fourth lens.
Preferably, the following conditional formula is also satisfied: 1< ACT/AAG <4, where ACT represents the sum of thicknesses of respective lenses on the optical axis, and AAG represents the sum of air spaces of respective adjacent lenses on the optical axis.
Preferably, the following conditional formula is also satisfied: 0.8<CT3/CT4<2.5。
Preferably, the following conditional formula is also satisfied: 0.6< f/TTL <1.0, where f denotes a focal length of the optical imaging lens group.
Preferably, the following conditional formula is also satisfied: 0.3<f/f3<1, wherein f3Represents the focal length of the third lens.
Preferably, the following conditional formula is also satisfied: 0.5<YC52/YC62<1.5 wherein Yc52The vertical distance between an inflection point and the optical axis, which is the shortest distance between the image side surface of the fifth lens and the optical axis, is represented; YC62And the vertical distance between the inflection point and the optical axis, which is the nearest distance from the image side surface of the sixth lens to the optical axis, is represented.
An electronic apparatus includes an image pickup device including an electron-sensitive element and the optical imaging lens group described above, the electron-sensitive element being provided on an imaging surface of the optical imaging lens group.
In view of the foregoing technical solutions, an optical imaging lens assembly provided by the present invention includes a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element, which are sequentially disposed from an object side to an image side along an optical axis, where an object side light passes through the respective lens elements in sequence to form an image on an image plane located at the image side of the sixth lens element. The optical imaging lens group is of a six-lens structure, each lens adopts a reasonable surface shape structure and an optimal range combination of optical parameters of each lens, and good imaging quality can be achieved. The ratio relation between the thickness of the first lens and the total length of the lens assembly is optimized, so that the total length of the lens assembly can be effectively shortened. And the size of the lens group head is reduced by limiting the difference relation between the effective diameter of the image side surface of the first lens and the effective diameter of the image side surface of the second lens. Therefore, the optical imaging lens assembly provided by the invention can effectively shorten the total length of the lens assembly on the premise of providing good imaging quality, achieves light and thin, and can meet the application requirements by miniaturizing the lens head.
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 an optical imaging lens assembly according to a first embodiment of the present disclosure;
FIG. 2 is a schematic diagram illustrating a fifth lens element of an optical imaging lens assembly according to a first embodiment of the present disclosure;
FIG. 3 is a schematic diagram illustrating a sixth lens element of an optical imaging lens assembly according to a first embodiment of the present invention;
FIG. 4 is a distortion field curvature diagram of an optical imaging lens group according to a first embodiment of the present invention;
FIG. 5 is a spherical aberration diagram of an optical imaging lens assembly according to a first embodiment of the present invention;
FIG. 6 is a diagram illustrating an optical imaging lens assembly according to a second embodiment of the present disclosure;
FIG. 7 is a distortion curvature diagram of an optical imaging lens assembly according to a second embodiment of the present invention;
FIG. 8 is a spherical aberration diagram of an optical imaging lens assembly according to a second embodiment of the present invention;
FIG. 9 is a diagram illustrating an optical imaging lens assembly according to a third embodiment of the present invention;
FIG. 10 is a distortion curvature diagram of an optical imaging lens assembly according to a third embodiment of the present invention;
FIG. 11 is a spherical aberration diagram of an optical imaging lens assembly according to a third embodiment of the present invention;
FIG. 12 is a diagram illustrating an optical imaging lens assembly according to a fourth embodiment of the present invention;
FIG. 13 is a distortion curvature diagram of an optical imaging lens assembly according to a fourth embodiment of the present invention;
FIG. 14 is a spherical aberration chart of an optical imaging lens assembly according to a fourth embodiment of the present invention;
FIG. 15 is a diagram illustrating an optical imaging lens assembly according to a fifth embodiment of the present invention;
FIG. 16 is a distortion field diagram of an optical imaging lens assembly according to a fifth embodiment of the present invention;
FIG. 17 is a spherical aberration diagram of an optical imaging lens assembly according to a fifth embodiment of the present invention;
FIG. 18 is a diagram illustrating an optical imaging lens assembly according to a sixth embodiment of the present invention;
FIG. 19 is a distortion curvature of an optical imaging lens group according to a sixth embodiment of the present invention;
FIG. 20 is a spherical aberration diagram of an optical imaging lens assembly according to a sixth embodiment of the present invention.
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.
An embodiment of the present invention provides an optical imaging lens assembly, including a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element and a sixth lens element sequentially disposed from an object side to an image side along an optical axis, each lens element having an object side surface facing an object side and an image side surface facing an image side, the object side surface and the image side surface of each lens element being aspheric, wherein:
the first lens element with positive refractive power has a convex object-side surface, the second lens element with negative refractive power has a positive refractive power, the third lens element with positive refractive power has a negative refractive power, and the fourth lens element with negative refractive power has a positive refractive power;
the fifth lens element with 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;
the sixth lens element with negative refractive power has a concave image-side surface at the paraxial region and at least one inflection point on the image-side surface;
any two adjacent lenses have a space, and the lenses do not move relatively, and the optical imaging lens group further comprises an aperture located on one side of the first lens facing the object space;
and satisfies the following conditional expressions:
0.1<CT1/TTL<0.3；
0.1<DM12-DM22<0.7；
wherein, CT1Represents the thickness of the first lens on the optical axis, TTL represents the distance between the object side surface of the first lens and the imaging surface of the optical imaging lens group on the optical axis, DM12Representing the effective diameter, DM, of the image-side surface of said first lens22Representing the effective diameter of the image side surface of the second lens.
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.
For each lens arrangement of the optical imaging lens group, in a case of from left to right from the object side to the 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, whereas a concave object side of the lens 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.
According to the optical imaging lens group, object light rays sequentially pass through the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens to form an image on an image plane located on the image side of the sixth lens.
The object-side surface of the first lens element is convex, so that the positive refractive power configuration of the first lens element can be adjusted, which is beneficial to shortening the total track length of the lens assembly. Preferably, the image side surface of the first lens may be concave at the paraxial region, enabling adjustment of low order aberrations. The second lens element with negative refractive power can correct the aberration generated by the first lens element, and preferably, the object-side surface of the second lens element can be convex at a paraxial region, which can help to enhance the correction of the astigmatism of the optical system. The fourth lens element with negative refractive power has a concave object-side surface at a paraxial region and a convex image-side surface at a paraxial region, and is useful for correcting astigmatism.
The image-side surface of the fifth lens element is concave at a paraxial region thereof, which helps prevent excessive concentration of refractive power in the fifth lens element and reduces excessive curvature of the peripheral region of the fifth lens element, thereby reducing the problem of poor molding.
The sixth lens element with negative refractive power has a concave image-side surface at the paraxial region and at least one inflection point on the image-side surface, which helps to keep the principal point of the optical system away from the image-side end, thereby effectively shortening the total length of the optical imaging lens assembly, facilitating the miniaturization of the optical imaging lens assembly, and further correcting off-axis aberration to improve the peripheral imaging quality.
The optical imaging lens group optimizes the ratio relation between the thickness of the first lens and the total length of the lens group, and meets the requirement of 0.1<CT1/TTL<0.3, the total length of the lens group and the thickness of the first lens are well balanced, and the total length of the lens group can be effectively shortened. In addition, the first lens and the second lens satisfy 0.1<DM12-DM22<0.7, the size of the lens group head is reduced by limiting the difference relation between the effective diameter of the image side surface of the first lens and the effective diameter of the image side surface of the second lens, and meanwhile, the large image height of the system is kept to ensure high pixels, if the difference relation exceeds the lower limit, the lens head is too large and does not meet the miniaturization design standard of the lens head in some applications, and if the difference relation exceeds the upper limit, the aberrations such as astigmatism, spherical aberration and the like of the lens are poor and cannot meet the imaging quality requirement.
Therefore, the optical imaging lens assembly of the present embodiment can effectively shorten the total length of the lens assembly on the premise of providing good imaging quality, achieve light and thin, and the lens head is miniaturized, which can meet the application requirements.
In a preferred embodiment, the third lens element has a convex object-side surface at the paraxial region and a convex image-side surface at the paraxial region. The object side surface and the image side surface of the third lens are of a double-convex structure at a paraxial region, so that paraxial spherical aberration can be effectively corrected, and peripheral astigmatic field curvature is reduced.
Preferably, the optical imaging lens group of the present embodiment further satisfies the following conditional expression: 2.0<(R21+R22)/(R21-R22)<6.0 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. Therefore, the curvature radius of the second lens can be adjusted better, so that the shape of the second lens is smoother and is beneficial to molding, and the correction of partial astigmatic field curvature is facilitated.
Preferably, the present optical imaging lens group further satisfies the following conditional expressions: 1.8<(CT3+CT4)/T34<8, wherein CT3Representing the thickness of said third lens on the optical axis, CT4Represents the thickness of the fourth lens on the optical axis, T34Represents an air space on an optical axis between the third lens and the fourth lens. The thickness and the arrangement of reasonable control third lens and fourth lens like this do benefit to the miniaturization of global design for there are better structure and tolerance during the assembly, do benefit to the volume production.
Preferably, the present optical imaging lens group further satisfies the following conditional expressions: 1< ACT/AAG <4, where ACT represents the sum of thicknesses of respective lenses on the optical axis, and AAG represents the sum of air spaces of respective adjacent lenses on the optical axis. The center thickness of each lens and the interval between each adjacent lens are further adjusted to have good structural design.
Preferably, the present optical imaging lens group further satisfies the following conditional expressions: 0.8<CT3/CT4<2.5. The manufacturability of the lens can be ensured, and the miniaturization of the lens can be maintained.
Preferably, the present optical imaging lens group further satisfies the following conditional expressions: 0.6< f/TTL <1.0, where f denotes a focal length of the optical imaging lens group. It is advantageous to maintain high image quality while effectively shortening the system length.
Preferably, the present optical imaging lens group further satisfies the following conditional expressions: 0.3<f/f3<1, wherein f3Represents the focal length of the third lens. Satisfying the above conditions is helpful to make the third lens element have a suitable refractive power, so that the optical imaging lens assembly can correct aberrations or further shorten the total track length according to the requirements.
Preferably, the optical imaging lens group of the present embodiment further satisfies the following conditional expression: 0.5<YC52/YC62<1.5 wherein Yc52The vertical distance between an inflection point and the optical axis, which is the shortest distance between the image side surface of the fifth lens and the optical axis, is represented; YC62And the vertical distance between the inflection point and the optical axis, which is the nearest distance from the image side surface of the sixth lens to the optical axis, is represented. The lens group meets the condition, can effectively improve the light height, meets the requirement of high pixels of an imaging system, enables light deflection to tend to be relaxed, can effectively reduce the sensitivity of the imaging system, and can effectively correct coma aberration, distortion and chromatic aberration of the imaging system.
The optical imaging lens group of the present invention will be described in detail below with specific examples.
Referring to fig. 1, a schematic diagram of an optical imaging lens assembly according to a first embodiment of the invention is shown. As can be seen from the figure, the optical imaging lens assembly of this embodiment includes, in order from an object side to an image side along an optical axis, a first lens element 11, a second lens element 12, a third lens element 13, a fourth lens element 14, a fifth lens element 15 and a sixth lens element 16, 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 11 with positive refractive power has a convex object-side surface, the second lens element 12 with negative refractive power, the third lens element 13 with positive refractive power, and the fourth lens element 14 with negative refractive power.
The fifth lens element 15 with 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.
The sixth lens element 16 with negative refractive power has a concave image-side surface at the paraxial region and at least one inflection point on the image-side surface.
The values of the conditional expressions in the present embodiment are shown in the following table:
please refer to fig. 2 and fig. 3, wherein Yc52The vertical distance between the optical axis and the inflection point of the image side surface of the fifth lens 15 which is closest to the optical axis is represented; YC62The vertical distance between the optical axis and the inflection point of the image-side surface of the sixth lens element 16 closest to the optical axis is represented.
The optical imaging lens group of the present embodiment is provided with a diaphragm 10 on the object side of the first lens 11. An infrared filter 17 is arranged between the sixth lens 16 and the imaging surface, and infrared band light entering the optical lens group is filtered through the infrared filter 17, so that the infrared light is prevented from irradiating the photosensitive chip to generate noise. The optional filter is made of glass and does not affect the focal length.
The optical imaging lens assembly of this embodiment has the structural parameters of each lens as shown in table 1-1, the focal length f is 3.97mm, the aperture value Fno is 1.69, and the field angle FOV is 71.01 degrees. In the table, the unit of curvature radius, thickness and focal length is mm, and surfaces 1-16 sequentially represent the surfaces from the object side to the image side, where surfaces 1-13 sequentially represent the aperture, the object side of the first lens, the image side of the first lens, the object side of the second lens, the image side of the second lens, the object side of the third lens, the image side of the third lens, the object side of the fourth lens, the image side of the fourth lens, the object side of the fifth lens, the image side of the fifth lens, the object side of the sixth lens and the image side of the sixth lens.
TABLE 1-1
Each lens in the optical imaging system adopts an aspheric surface design, and the curve equation of the aspheric surface is expressed as follows:
wherein X represents the relative height of a point on the aspheric surface at a distance Y from the optical axis and a tangent plane tangent to the vertex on the aspheric 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 cone coefficient; ai represents the i-th order aspheric coefficients.
The aspherical surface coefficients of the lenses of this embodiment are shown in tables 1 to 2, and A4 to A20 represent aspherical surface coefficients of 4 th to 20 th orders, respectively.
Tables 1 to 2
The distortion field curve and the spherical aberration curve of the optical lens set design of this embodiment are shown in FIG. 4 and FIG. 5, respectively, wherein the design wavelength of the distortion field curve is 0.555 μm, and the design wavelength of the spherical aberration curve is 0.470 μm, 0.510 μm, 0.555 μm, 0.610 μm and 0.650 μm.
Fig. 6 is a schematic view of an optical imaging lens assembly according to a second embodiment of the present invention. As can be seen from the figure, the optical imaging lens assembly of the present embodiment includes, in order from an object side to an image side along an optical axis, a first lens element 21, a second lens element 22, a third lens element 23, a fourth lens element 24, a fifth lens element 25 and a sixth lens element 26, each of which has an object-side surface facing an object side and an image-side surface facing an image side, and each of the object-side and image-side surfaces of each of the lens elements is aspheric.
The first lens element 21 with positive refractive power has a convex object-side surface, the second lens element 22 with negative refractive power, the third lens element 23 with positive refractive power, and the fourth lens element 24 with negative refractive power.
The fifth lens element 25 with 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.
The sixth lens element 26 with negative refractive power has a concave image-side surface at the paraxial region and at least one inflection point on the image-side surface.
The values of the conditional expressions in the present embodiment are shown in the following table:
the optical imaging lens group of the present embodiment is provided with a diaphragm 20 on the object side of the first lens 21. An infrared filter 27 is arranged between the sixth lens 26 and the imaging surface, and infrared band light entering the optical lens group is filtered by the infrared filter 27, so that the infrared light is prevented from irradiating the photosensitive chip to generate noise. The optional filter is made of glass and does not affect the focal length.
The optical imaging lens assembly of this embodiment has the structural parameters of each lens as shown in table 2-1, the focal length f is 3.53mm, the aperture value Fno is 1.69, and the field angle FOV is 73.57 degrees. In the table, the unit of curvature radius, thickness and focal length is mm, and surfaces 1-16 sequentially represent the surfaces from the object side to the image side, where surfaces 1-13 sequentially represent the aperture, the object side of the first lens, the image side of the first lens, the object side of the second lens, the image side of the second lens, the object side of the third lens, the image side of the third lens, the object side of the fourth lens, the image side of the fourth lens, the object side of the fifth lens, the image side of the fifth lens, the object side of the sixth lens and the image side of the sixth lens.
TABLE 2-1
The aspherical surface coefficients of the lenses of this embodiment are shown in table 2-2, and a4-a20 respectively represent aspherical surface coefficients of 4 th to 20 th orders on the lens surface.
Tables 2 to 2
The distortion field curve and the spherical aberration curve of the optical lens set design of this embodiment are shown in FIG. 7 and FIG. 8, respectively, wherein the design wavelength of the distortion field curve is 0.555 μm, and the design wavelength of the spherical aberration curve is 0.470 μm, 0.510 μm, 0.555 μm, 0.610 μm and 0.650 μm.
Fig. 9 is a schematic view of an optical imaging lens assembly according to a third embodiment of the present invention. As can be seen from the figure, the optical imaging lens assembly of the present embodiment includes, in order from an object side to an image side along an optical axis, a first lens element 31, a second lens element 32, a third lens element 33, a fourth lens element 34, a fifth lens element 35 and a sixth lens element 36, where each lens element has an object-side surface facing 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 31 with positive refractive power has a convex object-side surface, the second lens element 32 with negative refractive power, the third lens element 33 with positive refractive power, and the fourth lens element 34 with negative refractive power.
The fifth lens element 35 with 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.
The sixth lens element 36 with negative refractive power has a concave image-side surface at the paraxial region and at least one inflection point on the image-side surface.
The values of the conditional expressions in the present embodiment are shown in the following table:
the optical imaging lens group of the present embodiment is provided with a stop 30 on the object side of the first lens 31. An infrared filter 37 is arranged between the sixth lens 36 and the imaging surface, and infrared band light entering the optical lens group is filtered by the infrared filter 37, so that the infrared light is prevented from irradiating the photosensitive chip to generate noise. The optional filter is made of glass and does not affect the focal length.
The optical imaging lens assembly of this embodiment has the structural parameters of each lens as shown in table 3-1, the focal length f is 4.46mm, the aperture value Fno is 1.69, and the field angle FOV is 73.40 degrees. In the table, the unit of curvature radius, thickness and focal length is mm, and surfaces 1-16 sequentially represent the surfaces from the object side to the image side, where surfaces 1-13 sequentially represent the aperture, the object side of the first lens, the image side of the first lens, the object side of the second lens, the image side of the second lens, the object side of the third lens, the image side of the third lens, the object side of the fourth lens, the image side of the fourth lens, the object side of the fifth lens, the image side of the fifth lens, the object side of the sixth lens and the image side of the sixth lens.
TABLE 3-1
The aspherical surface coefficients of the lenses of this embodiment are shown in Table 3-2, and A4-A20 show aspherical surface coefficients of 4 th to 20 th orders, respectively.
TABLE 3-2
The distortion field curve and the spherical aberration curve of the optical lens set design of this embodiment are shown in FIG. 10 and FIG. 11, respectively, wherein the design wavelength of the distortion field curve is 0.555 μm, and the design wavelength of the spherical aberration curve is 0.470 μm, 0.510 μm, 0.555 μm, 0.610 μm and 0.650 μm.
Fig. 12 is a schematic view of an optical imaging lens assembly according to a fourth embodiment of the present invention. As can be seen, the optical imaging lens assembly of this embodiment includes, in order from an object side to an image side along an optical axis, a first lens 41, a second lens 42, a third lens 43, a fourth lens 44, a fifth lens 45, and a sixth lens 46, where each lens has an object side surface facing an object side and an image side surface facing an image side, and the object side surface and the image side surface of each lens are aspheric.
The first lens element 41 with positive refractive power has a convex object-side surface, the second lens element 42 with negative refractive power, the third lens element 43 with positive refractive power and the fourth lens element 44 with negative refractive power.
The fifth lens element 45 with 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.
The sixth lens element 46 with negative refractive power has a concave image-side surface at the paraxial region and at least one inflection point on the image-side surface.
The values of the conditional expressions in the present embodiment are shown in the following table:
the optical imaging lens group of the present embodiment is provided with a stop 40 on the object side of the first lens 41. An infrared filter 47 is arranged between the sixth lens 46 and the imaging surface, and infrared band light entering the optical lens group is filtered by the infrared filter 47, so that the infrared light is prevented from irradiating the photosensitive chip to generate noise. The optional filter is made of glass and does not affect the focal length.
The optical imaging lens assembly of this embodiment has the structural parameters of each lens as shown in table 4-1, the focal length f is 4.42mm, the aperture value Fno is 1.69, and the field angle FOV is 68.87 degrees. In the table, the unit of curvature radius, thickness and focal length is mm, and surfaces 1-16 sequentially represent the surfaces from the object side to the image side, where surfaces 1-13 sequentially represent the aperture, the object side of the first lens, the image side of the first lens, the object side of the second lens, the image side of the second lens, the object side of the third lens, the image side of the third lens, the object side of the fourth lens, the image side of the fourth lens, the object side of the fifth lens, the image side of the fifth lens, the object side of the sixth lens and the image side of the sixth lens.
TABLE 4-1
The aspherical surface coefficients of the lenses of this embodiment are shown in Table 4-2, and A4-A20 show aspherical surface coefficients of 4 th to 20 th orders, respectively.
TABLE 4-2
The distortion field curve and the spherical aberration curve of the optical lens set design of this embodiment are shown in FIG. 13 and FIG. 14, respectively, wherein the design wavelength of the distortion field curve is 0.555 μm, and the design wavelength of the spherical aberration curve is 0.470 μm, 0.510 μm, 0.555 μm, 0.610 μm and 0.650 μm.
Fig. 15 is a schematic view of an optical imaging lens assembly according to a fifth embodiment of the present invention. As can be seen, the optical imaging lens assembly of this embodiment includes, in order from an object side to an image side along an optical axis, a first lens 51, a second lens 52, a third lens 53, a fourth lens 54, a fifth lens 55 and a sixth lens 56, where each lens has an object side surface facing an object side and an image side surface facing an image side, and the object side surface and the image side surface of each lens are aspheric.
The first lens element 51 with positive refractive power has a convex object-side surface, the second lens element 52 with negative refractive power, the third lens element 53 with positive refractive power, and the fourth lens element 54 with negative refractive power.
The fifth lens element 55 with 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.
The sixth lens element 56 with negative refractive power has a concave image-side surface at the paraxial region and at least one inflection point on the image-side surface.
The values of the conditional expressions in the present embodiment are shown in the following table:
the optical imaging lens group of the present embodiment is provided with a stop 50 on the object side of the first lens 51. An infrared filter 57 is arranged between the sixth lens 56 and the imaging surface, and infrared band light entering the optical lens group is filtered by the infrared filter 57, so that the infrared light is prevented from irradiating the photosensitive chip to generate noise. The optional filter is made of glass and does not affect the focal length.
The optical imaging lens assembly of this embodiment has the structural parameters of each lens as shown in table 5-1, the focal length f is 3.63mm, the aperture value Fno is 1.69, and the field angle FOV is 79.41 degrees. In the table, the unit of curvature radius, thickness and focal length is mm, and surfaces 1-16 sequentially represent the surfaces from the object side to the image side, where surfaces 1-13 sequentially represent the aperture, the object side of the first lens, the image side of the first lens, the object side of the second lens, the image side of the second lens, the object side of the third lens, the image side of the third lens, the object side of the fourth lens, the image side of the fourth lens, the object side of the fifth lens, the image side of the fifth lens, the object side of the sixth lens and the image side of the sixth lens.
TABLE 5-1
The aspherical surface coefficients of the lenses of this embodiment are shown in Table 5-2, and A4-A20 show aspherical surface coefficients of 4 th to 20 th orders, respectively.
TABLE 5-2
The distortion field curve and the spherical aberration curve of the optical lens set design of this embodiment are shown in FIG. 16 and FIG. 17, respectively, wherein the design wavelength of the distortion field curve is 0.555 μm, and the design wavelength of the spherical aberration curve is 0.470 μm, 0.510 μm, 0.555 μm, 0.610 μm and 0.650 μm.
Fig. 18 is a schematic view of an optical imaging lens assembly according to a sixth embodiment of the present invention. As can be seen from the figure, the optical imaging lens assembly of the present embodiment includes, in order from an object side to an image side along an optical axis, a first lens 61, a second lens 62, a third lens 63, a fourth lens 64, a fifth lens 65 and a sixth lens 66, where each lens has an object side surface facing an object side and an image side surface facing an image side, and the object side surface and the image side surface of each lens are aspheric.
The first lens element 61 with positive refractive power has a convex object-side surface, the second lens element 62 with negative refractive power, the third lens element 63 with positive refractive power, and the fourth lens element 64 with negative refractive power.
The fifth lens element 65 with 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.
The sixth lens element 66 with negative refractive power has a concave image-side surface at the paraxial region and at least one inflection point on the image-side surface.
The values of the conditional expressions in the present embodiment are shown in the following table:
the optical imaging lens group of the present embodiment is provided with a stop 60 on the object side of the first lens 61. An infrared filter 67 is arranged between the sixth lens 66 and the imaging surface, and infrared band light entering the optical lens group is filtered by the infrared filter 67, so that the infrared light is prevented from irradiating the photosensitive chip to generate noise. The optional filter is made of glass and does not affect the focal length.
The optical imaging lens assembly of this embodiment has the structural parameters of each lens as shown in table 6-1, the focal length f is 4.44mm, the aperture value Fno is 1.69, and the field angle FOV is 72.51 degrees. In the table, the unit of curvature radius, thickness and focal length is mm, and surfaces 1-16 sequentially represent the surfaces from the object side to the image side, where surfaces 1-13 sequentially represent the aperture, the object side of the first lens, the image side of the first lens, the object side of the second lens, the image side of the second lens, the object side of the third lens, the image side of the third lens, the object side of the fourth lens, the image side of the fourth lens, the object side of the fifth lens, the image side of the fifth lens, the object side of the sixth lens and the image side of the sixth lens.
TABLE 6-1
The aspherical surface coefficients of the lenses of this embodiment are shown in Table 6-2, and A4-A20 show aspherical surface coefficients of 4 th to 20 th orders, respectively.
TABLE 6-2
The distortion field curve and the spherical aberration curve of the optical lens set design of this embodiment are shown in FIG. 19 and FIG. 20, respectively, wherein the design wavelength of the distortion field curve is 0.555 μm, and the design wavelength of the spherical aberration curve is 0.470 μm, 0.510 μm, 0.555 μm, 0.610 μm and 0.650 μm.
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 optical imaging lens group, and the electronic photosensitive element is arranged on an imaging surface of the optical imaging lens group.
In the electronic device provided by this embodiment, the optical imaging lens group adopted by the image capturing device is a six-piece lens structure, and each lens adopts a reasonable surface shape structure and an optimal range combination of optical parameters of each lens, so that the electronic device has good imaging quality. The ratio relation between the thickness of the first lens and the total length of the lens assembly is optimized, so that the total length of the lens assembly can be effectively shortened. And the lens group head is reduced in size by limiting the ratio relation between the effective diameter of the image side surface of the first lens and the effective diameter of the image side surface of the second lens. Therefore, the optical imaging lens assembly of the electronic device can effectively shorten the total length of the lens assembly on the premise of providing good imaging quality, achieves light and thin, is miniaturized on the lens head, and can meet application requirements.
The optical imaging lens assembly 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 (9)
1. An optical imaging lens assembly, comprising six lenses, including a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens sequentially disposed from an object side to an image side along an optical axis, each lens having an object side surface facing an object space and an image side surface facing an image space, the object side surface and the image side surface of each lens being aspheric, wherein:
the first lens element with positive refractive power has a convex object-side surface;
the second lens element with negative refractive power has a convex object-side surface at paraxial region;
the third 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 fourth lens element with negative 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 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;
the sixth lens element with negative refractive power has a concave image-side surface at the paraxial region and at least one inflection point on the image-side surface;
any two adjacent lenses have a space, and the lenses do not move relatively, and the optical imaging lens group further comprises an aperture located on one side of the first lens facing the object space;
and satisfies the following conditional expressions:
0.1<CT1/TTL<0.3；
0.1<DM12-DM22<0.7；
wherein, CT1Represents the thickness of the first lens on the optical axis, TTL represents the distance between the object side surface of the first lens and the imaging surface of the optical imaging lens group on the optical axis, DM12Representing the effective diameter, DM, of the image-side surface of said first lens22Representing the effective diameter of the image side surface of the second lens.
2. An optical imaging lens group according to claim 1, further satisfying the following conditional expression: 2.0<(R21+R22)/(R21-R22)<6.0 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.
3. An optical imaging lens group according to claim 1, further satisfying the following conditional expression: 1.8<(CT3+CT4)/T34<8, wherein CT3Representing the thickness of said third lens on the optical axis, CT4Represents the thickness of the fourth lens on the optical axis, T34Represents an air space on an optical axis between the third lens and the fourth lens.
4. An optical imaging lens group according to claim 1, further satisfying the following conditional expression: 1< ACT/AAG <4, where ACT represents the sum of thicknesses of respective lenses on the optical axis, and AAG represents the sum of air spaces of respective adjacent lenses on the optical axis.
5. An optical imaging lens group according to claim 1, further satisfying the following conditional expression: 0.8<CT3/CT4<2.5, wherein CT3Representing the thickness of said third lens on the optical axis, CT4Represents the thickness of the fourth lens on the optical axis.
6. An optical imaging lens group according to claim 1, further satisfying the following conditional expression: 0.6< f/TTL <1.0, where f denotes a focal length of the optical imaging lens group.
7. An optical imaging lens group according to claim 1, further satisfying the following conditional expression: 0.3<f/f3<1, wherein f3Represents the focal length of the third lens.
8. An optical imaging lens group according to claim 1, further satisfying the following conditional expression: 0.5<YC52/YC62<1.5 wherein Yc52The vertical distance between an inflection point and the optical axis, which is the shortest distance between the image side surface of the fifth lens and the optical axis, is represented; YC62And the vertical distance between the inflection point and the optical axis, which is the nearest distance from the image side surface of the sixth lens to the optical axis, is represented.
9. An electronic apparatus characterized by comprising an image pickup device including an electron-sensitive element provided to an imaging surface of an optical imaging lens group according to any one of claims 1 to 8 and the optical imaging lens group.
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| CN109143551B (en) * | 2018-09-21 | 2021-05-07 | 贵州旭业光电有限公司 | Optical imaging lens group and camera device using same |
| CN111308655B (en) * | 2018-12-26 | 2021-09-10 | 浙江舜宇光学有限公司 | Optical imaging lens |
| EP3910397A4 (en) * | 2019-01-30 | 2021-12-29 | SZ DJI Technology Co., Ltd. | Imaging lens, imaging apparatus and electronic device |
| CN110262017B (en) * | 2019-06-27 | 2021-07-16 | Oppo广东移动通信有限公司 | Optical lens, camera module and electronic device |
| WO2022120575A1 (en) * | 2020-12-08 | 2022-06-16 | 欧菲光集团股份有限公司 | Optical system, image capturing module, and electronic device |
| CN115079373A (en) * | 2021-02-09 | 2022-09-20 | 三营超精密光电(晋城)有限公司 | Optical imaging system, image capturing module and electronic device |
| TWI769784B (en) * | 2021-04-14 | 2022-07-01 | 新鉅科技股份有限公司 | Optical lens system and photographing module |
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| TWI489133B (en) * | 2014-06-20 | 2015-06-21 | Largan Precision Co Ltd | Image capturing optical system, image capturing device, and portable device |
| WO2016109956A1 (en) * | 2015-01-07 | 2016-07-14 | 浙江舜宇光学有限公司 | Camera lens |
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