CN108254904B - Optical image capturing lens and camera shooting equipment - Google Patents
Optical image capturing lens and camera shooting equipment Download PDFInfo
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- CN108254904B CN108254904B CN201810240441.7A CN201810240441A CN108254904B CN 108254904 B CN108254904 B CN 108254904B CN 201810240441 A CN201810240441 A CN 201810240441A CN 108254904 B CN108254904 B CN 108254904B
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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Abstract
The invention discloses an optical image capturing lens, which comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a seventh lens which are sequentially arranged from an object side to an image side along an optical axis, wherein each lens adopts a reasonable surface shape structure and an optimized range combination of optical parameters of each lens, so that higher imaging quality can be maintained, and a large field angle is achieved. The thickness of the third lens and the fourth lens of the middle lens group is controlled, so that the thickness ratio is better in the whole structure, and the whole length of the optical lens is favorably shortened. Therefore, the optical image capturing lens of the invention can effectively shorten the overall length of the lens group and achieve light and thin under the conditions of maintaining higher imaging quality and having a large field angle. The invention also discloses a camera device comprising the optical image capturing lens.
Description
Technical Field
The present invention relates to the field of optical systems, and in particular, to an optical imaging lens. The invention also relates to an image pickup apparatus.
Background
In recent years, with the rapid development of electronic technology, portable mobile electronic devices, such as smart phones, tablet computers, automobile data recorders, and motion cameras, have been rapidly popularized. The popularity of mobile portable electronic devices has led to the development of optical imaging lenses. While the mobile portable electronic device brings great convenience to life of people, the functional requirements of people on the mobile electronic device are higher and higher, and the imaging requirements on an optical imaging module applied to the mobile electronic device are higher and higher.
In the prior art, a mainstream imaging lens is designed by adopting five or six lens elements, and although the lens is light and thin, the lens is difficult to be improved to a higher pixel, a better imaging quality and a larger view field angle on the basis.
Disclosure of Invention
The present invention provides an optical image capturing lens, which can effectively shorten the overall length of a lens assembly and achieve light weight and thinness while maintaining high imaging quality and having a large field angle. The invention also provides an image pickup apparatus.
In order to solve the technical problems, the invention provides the following technical scheme:
an optical image capturing lens includes 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, which are disposed in order from an object side to an image side along an optical axis, wherein:
the first lens has positive focal power, and the object side surface of the first lens is a convex surface;
the second lens has negative focal power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface;
the third lens has optical power;
the fourth lens has positive focal power, the object side surface of the fourth lens is convex at a paraxial region, and the image side surface of the fourth lens is convex;
the fifth lens has optical power;
the sixth lens element has a negative optical power, a convex object-side surface at a paraxial region thereof, and a concave image-side surface at a paraxial region thereof;
the seventh lens element has a negative focal power, both the object-side surface and the image-side surface of the seventh lens element are concave at the paraxial region, and the image-side surface of the seventh lens element has at least one inflection point;
and satisfies the following conditional expressions:
2.0<CT4/CT3<4.0；
0.2<(R41+R42)/(R41-R42)<0.8；
wherein, CT3Representing the thickness of said third lens on the optical axis, CT4Represents the thickness of the fourth lens on the optical axis, R41Represents a radius of curvature, R, of an object-side surface of the fourth lens42Represents a radius of curvature of the image-side surface of the fourth lens.
Optionally, the third lens element has a convex object-side surface at the paraxial region and a concave image-side surface at the paraxial region, and both the object-side surface and the image-side surface have at least one inflection point.
Optionally, the following conditional expression is also satisfied: 1.0<R31/R32<4.0; wherein R is31Denotes the object side of the third lensRadius of curvature of face, R32Represents a radius of curvature of the image-side surface of the third lens.
Optionally, the following conditional expression is also satisfied: 5.0<AG23/AG12<8.0，5.0<AG45/AG34<10.0，8.0<AG67/AG56<12.0 of the total weight of the mixture; wherein, AG12Represents an air space, AG, on an optical axis between the first lens and the second lens23Represents an air space, AG, on an optical axis between the second lens and the third lens34Represents an air space, AG, on an optical axis of the third lens and the fourth lens45Represents an air space, AG, of the fourth lens and the fifth lens on an optical axis56Represents an air space, AG, on an optical axis of the fifth lens and the sixth lens67An air space on the optical axis of the sixth lens and the seventh lens is indicated.
Optionally, the following conditional expression is also satisfied: -6<f4/f7<-2; wherein f is4Denotes the focal length of the fourth lens, f7Denotes a focal length of the seventh lens.
Optionally, the third lens has a negative power, and further satisfies the following conditional expression: -12.0<f3/f5<-3.0; wherein f is3Denotes the focal length of the third lens, f5Denotes a focal length of the fifth lens.
Optionally, the following conditional expression is also satisfied: 0.7< f/TTL < 0.9; wherein f represents the focal length of the optical image capturing lens, and TTL represents the distance on the optical axis from the object-side surface of the first lens element to the imaging surface.
Optionally, the following conditional expression is also satisfied: 0.3<SAG21+SAG22<0.5; wherein, SAG21The distance from the intersection point of the object side surface of the second lens and the optical axis to the projection point of the maximum optical effective diameter position of the object side surface of the second lens on the optical axis, SAG22And the distance from the intersection point of the image side surface of the second lens and the optical axis to the projection point of the maximum optical effective diameter position of the image side surface of the second lens on the optical axis is represented.
Optionally, the following conditional expression is also satisfied: 1.0< ∑ CT- Σ AG < 3.0; Σ CT represents a sum of thicknesses of the respective first, second, third, fourth, fifth, sixth, and seventh lenses on the optical axis, and Σ AG represents a sum of air spaces between the respective adjacent lenses of the first to seventh lenses on the optical axis.
Optionally, also satisfy at LCT12、LCT34、LCT56The difference between any two of the three parameters is less than 0.2, wherein the LCT12Representing the distance on the optical axis from the object-side surface of the first lens to the image-side surface of the second lens, LCT34Representing the distance on the optical axis from the object-side surface of the third lens to the image-side surface of the fourth lens, LCT56And the distance from the object side surface of the fifth lens to the image side surface of the sixth lens on the optical axis is represented.
Optionally, the following conditional expression is also satisfied: -6<f5/R51+f5/R52<-2; wherein f is5Denotes a focal length, R, of the fifth lens51Represents 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 camera shooting equipment comprises an electronic photosensitive element and the optical image taking lens, wherein the electronic photosensitive element is arranged on an imaging surface of the optical image taking lens.
In view of the above technical solutions, the optical image capturing lens provided by the present invention includes a first lens element, a second lens element, a third lens element, a fourth lens element, a fifth lens element, a sixth lens element and a seventh lens element, which are sequentially disposed from an object side to an image side along an optical axis, wherein an object side light passes through the respective lens elements in sequence to form an image on an image plane at the image side of the seventh lens element.
According to the optical image capturing lens, each lens adopts a reasonable surface shape structure and the optimal range combination of optical parameters of each lens, so that higher imaging quality can be maintained, and the optical image capturing lens has a large field angle. The thickness of the third lens and the fourth lens of the middle lens group is controlled, so that the thickness ratio is better in the whole structure, and the whole length of the optical lens is favorably shortened. Therefore, the optical image capturing lens of the invention can effectively shorten the overall length of the lens group and achieve light and thin under the conditions of maintaining higher imaging quality and having a large field angle.
The invention provides an image pickup apparatus capable of achieving the above advantageous 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 optical imaging lens system according to a first embodiment of the present invention;
fig. 2 is a distortion field curvature diagram of an optical image capturing lens according to a first embodiment of the present invention;
fig. 3 is a spherical aberration curve chart of the optical image capturing lens according to the first embodiment of the present invention;
fig. 4 is a schematic view of an optical image capturing lens system according to a second embodiment of the present invention;
FIG. 5 is a distortion field curvature diagram of an optical image capturing lens system according to a second embodiment of the present invention;
FIG. 6 is a spherical aberration curve chart of an optical image capturing lens according to a second embodiment of the present invention;
fig. 7 is a schematic view of an optical image capturing lens system according to a third embodiment of the present invention;
fig. 8 is a distortion field curvature diagram of an optical image capturing lens system according to a third embodiment of the present invention;
fig. 9 is a spherical aberration curve chart of the optical image capturing lens according to the third 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 image capturing lens including 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, which are disposed in order from an object side to an image side along an optical axis, wherein:
the first lens has positive focal power, and the object side surface of the first lens is a convex surface;
the second lens has negative focal power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface;
the third lens has optical power;
the fourth lens has positive focal power, the object side surface of the fourth lens is convex at a paraxial region, and the image side surface of the fourth lens is convex;
the fifth lens has optical power;
the sixth lens element has a negative optical power, a convex object-side surface at a paraxial region thereof, and a concave image-side surface at a paraxial region thereof;
the seventh lens element has a negative focal power, both the object-side surface and the image-side surface of the seventh lens element are concave at the paraxial region, and the image-side surface of the seventh lens element has at least one inflection point;
and satisfies the following conditional expressions:
2.0<CT4/CT3<4.0；
0.2<(R41+R42)/(R41-R42)<0.8；
wherein, CT3Representing the thickness of said third lens on the optical axis, CT4Represents the thickness of the fourth lens on the optical axis, R41Represents a radius of curvature, R, of an object-side surface of the fourth lens42Represents a radius of curvature of the image-side surface of the fourth lens.
It should be noted that the focal power (focal power) is the difference between the image-side light beam convergence and the object-side light beam convergence, and it represents the refractive power of the optical system for the incident parallel light beams, and the optical system has positive optical power, indicating that the refraction for the light beams is convergent; the optical system has a negative power, indicating that the refraction of the light is divergent.
The object side of the lens is convex, which means that any point on the object side of the lens is tangent, the surface is always on the right of the tangent plane, the curvature radius is positive, otherwise, the object side is concave, and the curvature radius 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 at any point on the object side or the image side of the lens, and the surface has both the part on the left side and the part on the right side of the section, the surface has a curve inflection point. The above applies to the determination of the presence of irregularities at the paraxial region of the object-side surface and the image-side surface of the lens.
In the optical imaging system, an object-side light ray sequentially passes through the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens to be imaged on an imaging surface at the image side of the seventh lens.
The first lens has positive focal power and can converge the light rays with large visual angles entering the optical system. The second lens is in a meniscus shape and has negative focal power, and can inhibit the spherical aberration generated by the first lens, so that the aberration of light passing through the section is not too large. The fourth lens has a biconvex structure, and can well balance partial field curvature aberration. The fifth lens is in a meniscus shape, wherein the thickness is larger than the edge thickness, and the fifth lens can better lift light rays to achieve large image height. The seventh lens is of a double-concave structure at the position of a dipped optical axis, the edge thickness is larger than the middle thickness, the refraction angle of the light outside the axis can be suppressed to be smaller, and the phenomenon that the light cannot be focused on a photosensitive area due to the fact that the main light incoming angle is too large is avoided, so that an image becomes dark or changes color.
In the optical image capturing lens, the third lens and the fourth lens satisfy the conditional expression 2.0<CT4/CT3<4.0 working by controlling the middle two lensesAnd (4) technological forming conditions. The thicknesses of the third lens and the fourth lens are in a better thickness ratio in the whole structure, so that the whole length of the optical lens is favorably shortened, and the light and thin effect is achieved. If the thickness of the fourth lens exceeds the lower limit, the thickness of the third lens is small, the design is difficult in structure, and the injection molding is difficult; if the thickness of the fourth lens is too small when the upper limit is exceeded, the thickness of the third lens is too large. Further, the fourth lens satisfies 0.2<(R41+R42)/(R41-R42)<0.8, the biconvex structure of the fourth lens can be effectively controlled, the sensitivity of the fourth lens can be ensured, and the better molding condition of the fourth lens can be ensured.
Therefore, the optical image capturing lens of the present embodiment can effectively shorten the overall length of the lens assembly to achieve light weight and thinness while maintaining high imaging quality and having a large field angle.
In one embodiment, the third lens element has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region, and both the object-side surface and the image-side surface have at least one inflection point. This enables the aberrations to be optimised,
more specifically, the range of the radius of curvature of the third lens satisfies the following conditional expression: 1.0<R31/R32<4.0; wherein R is31Represents a radius of curvature, R, of an object-side surface of the third lens32Represents a radius of curvature of the image-side surface of the third lens. The aberration can be optimized by an optimized design of the third lens surface shape structure.
Preferably, the optical image capturing lens of the present embodiment further satisfies the following conditional expression: 5.0<AG23/AG12<8.0，5.0<AG45/AG34<10.0，8.0<AG67/AG56<12.0 of the total weight of the mixture; wherein, AG12Represents an air space, AG, on an optical axis between the first lens and the second lens23Represents an air space, AG, on an optical axis between the second lens and the third lens34Represents an air space, AG, on an optical axis of the third lens and the fourth lens45Denotes the fourth lens and the second lensAir space of five lenses on optical axis, AG56Represents an air space, AG, on an optical axis of the fifth lens and the sixth lens67An air space on the optical axis of the sixth lens and the seventh lens is indicated. The interval between every lens sets up, can make the lens battery overall structure compact, easily do subsequent structural design to make optical system whole have better sensitivity, make aberration correction also comparatively ideal.
Preferably, the optical image capturing lens further satisfies the following conditional expression: -6<f4/f7<-2; wherein f is4Denotes the focal length of the fourth lens, f7Denotes a focal length of the seventh lens. The focal length ratio among the lenses is limited within a range, so that the refractive power of each lens of the system is not too large or too small, the aberration influence caused by the deflection of light rays can be controlled under the condition that the total length of the lens group is reduced, and the imaging quality is improved.
Optionally, the third lens has negative focal power, and further satisfies the following conditional expression: -12.0<f3/f5<-3.0; wherein f is3Denotes the focal length of the third lens, f5Denotes a focal length of the fifth lens. The focal length ratio among the lenses is limited within a range, so that the refractive power of each lens of the system is not too large or too small, the aberration influence caused by the deflection of light rays can be controlled under the condition that the total length of the lens group is reduced, and the imaging quality is improved.
Preferably, the optical image capturing lens of the present embodiment further satisfies the following conditional expression: 0.7< f/TTL < 0.9; wherein f represents the focal length of the optical image capturing lens, and TTL represents the distance on the optical axis from the object-side surface of the first lens element to the imaging surface. The ratio of the focal power to the total length of the whole lens group can be controlled reasonably by satisfying the relation, so that the whole structure is compact.
Further, the optical image capturing lens of the embodiment further satisfies the following conditional expressions: 0.3<SAG21+SAG22<0.5; wherein, SAG21The position of the maximum optical effective diameter from the intersection point of the object side surface and the optical axis of the second lens to the object side surface of the second lens is shownDistance of projected points on optical axis, SAG22And the distance from the intersection point of the image side surface of the second lens and the optical axis to the projection point of the maximum optical effective diameter position of the image side surface of the second lens on the optical axis is represented. Therefore, the balance between the aberration and the shape structure can be ensured, and when the lower limit is exceeded, the object side surface and the image side surface of the second lens are relatively flat, so that the aberration correction result is relatively poor; when the second lens exceeds the upper limit, the shape of the second lens is too bent, the sensitivity is higher, and the yield of the product mass production is difficult to ensure subsequently.
Preferably, the optical image capturing lens of the present embodiment further satisfies the following conditional expression: 1.0< ∑ CT- Σ AG < 3.0; Σ CT represents a sum of thicknesses of the respective first, second, third, fourth, fifth, sixth, and seventh lenses on the optical axis, and Σ AG represents a sum of air spaces between the respective adjacent lenses of the first to seventh lenses on the optical axis. Through optimizing the relation that sets up air interval between lens thickness of lens group and the lens to reach comparatively reasonable thickness ratio, do benefit to the holistic miniaturization of optical lens group.
More specifically, the method also meets the requirement of LCT12、LCT34、LCT56The difference between any two of the three parameters is less than 0.2, wherein the LCT12Representing the distance on the optical axis from the object-side surface of the first lens to the image-side surface of the second lens, LCT34Representing the distance on the optical axis from the object-side surface of the third lens to the image-side surface of the fourth lens, LCT56And the distance from the object side surface of the fifth lens to the image side surface of the sixth lens on the optical axis is represented. By arranging the lens layout of the lens group, the whole structure of the lens group is compact, and the light and thin effects are achieved.
Preferably, the optical image capturing lens of the present embodiment further satisfies the following conditional expression: -6<f5/R51+f5/R52<-2; wherein f is5Denotes a focal length, R, of the fifth lens51Represents 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. By facing the fifth lens surfaceThe shape structure is optimally designed, the field curvature of the off-axis field of view can be reduced, and the spherical aberration of the central part is reduced, so that the imaging quality is improved.
The optical image capturing lens of the present invention is described in detail with reference to the following embodiments.
First embodiment
Fig. 1 is a schematic view of an optical image capturing lens according to a first embodiment of the present invention. As can be seen from the figure, the optical image capturing lens includes 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, a sixth lens element 16 and a seventh lens element 17, which are disposed in order from an object side to an image side along an optical axis.
The first lens element 11 has positive optical power, and its object-side surface is convex.
The second lens element 12 has a negative focal power, and has a convex object-side surface and a concave image-side surface.
The third lens element 13 has a power, a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region.
The fourth lens element 14 has positive optical power, with a convex object-side surface at the paraxial region and a convex image-side surface.
The fifth lens element 15 has a focal power, and has a concave object-side surface and a convex image-side surface.
The sixth lens element 16 has a negative power, a convex object-side surface at a paraxial region, and a concave image-side surface at a paraxial region.
The seventh lens element 17 has a negative power, and has a concave object-side surface and a concave image-side surface at a paraxial region, and has at least one inflection point on the image-side surface thereof, i.e., at least one inflection point on a longitudinal cross section of the seventh lens element from an intersection of the image-side surface thereof with the optical axis to an edge of the image-side surface thereof.
The values of the conditional expressions in the present embodiment are shown in the following table:
the optical image capturing lens of the present embodiment is provided with a stop 10 on the object side of a first lens 11. An infrared filter 18 is arranged between the seventh lens 17 and the imaging surface, and infrared band light entering the optical lens group is filtered by the infrared filter 18, 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 structural parameters of each lens of the optical image capturing lens of this embodiment are specifically shown in table 1-1, where the focal length f is 4.67mm, the aperture value Fno is 2.00, and the field angle FOV is 83.1 degrees. The unit of curvature radius, thickness and focal length in the table is mm, and surfaces 1-18 sequentially represent the surfaces from the object side to the image side, where surfaces 1-15 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, the image side of the sixth lens, the object side of the seventh lens, and the image side of the seventh lens. In the following table, in the thickness column data, the numerical value in the column corresponding to the aperture is the air gap between the aperture and the next lens; the numerical value in the first column corresponding to the same lens is the center thickness of the lens, and the numerical value in the second column is the air space between the lens and the next optical element; the value in the first column corresponding to the infrared filter is the thickness of the infrared filter, and the value in the second column is the air interval between the infrared filter and the imaging plane.
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 representsThe relative height of a point on the aspheric surface, which is Y away 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 specifically shown in tables 1 to 2, and a2 to a16 represent aspherical surface coefficients of orders 2 to 16, respectively, on the lens surface.
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. 2 and FIG. 3, 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.
Second embodiment
Fig. 4 is a schematic view of an optical image capturing lens according to a second embodiment of the present invention. As can be seen from the figure, the optical image capturing lens includes 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, a sixth lens element 26 and a seventh lens element 27, which are sequentially disposed from an object side to an image side along an optical axis.
The first lens 21 has positive optical power, and the object-side surface thereof is convex.
The second lens element 22 has a negative focal power, and has a convex object-side surface and a concave image-side surface.
The third lens element 23 has a power, a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region.
The fourth lens element 24 has positive optical power, with a convex object-side surface at the paraxial region and a convex image-side surface.
The fifth lens element 25 has a focal power, and has a concave object-side surface and a convex image-side surface.
The sixth lens element 26 has a negative power, a convex object-side surface at a paraxial region, and a concave image-side surface at a paraxial region.
The seventh lens element 27 has a negative power, and has a concave object-side surface and a concave image-side surface at a paraxial region, and has at least one inflection point on the image-side surface thereof, i.e., at least one inflection point on a longitudinal cross section of the seventh lens element from an intersection of the image-side surface thereof with the optical axis to an edge of the image-side surface thereof.
The values of the conditional expressions in the present embodiment are shown in the following table:
the optical image taking lens of the present embodiment is provided with an aperture 20 on the object side of a first lens 21. An infrared filter 28 is disposed between the seventh lens 27 and the imaging surface, and infrared band light entering the optical lens assembly is filtered by the infrared filter 28, 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 structural parameters of each lens of the optical image capturing lens of this embodiment are specifically shown in table 2-1, where the focal length f is 4.86mm, the aperture value Fno is 2.00, and the field angle FOV is 80.9 degrees. The unit of curvature radius, thickness and focal length in the table is mm, and surfaces 1-18 sequentially represent the surfaces from the object side to the image side, where surfaces 1-15 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, the image side of the sixth lens, the object side of the seventh lens, and the image side of the seventh lens. In the following table, in the thickness column data, the numerical value in the column corresponding to the aperture is the air gap between the aperture and the next lens; the numerical value in the first column corresponding to the same lens is the center thickness of the lens, and the numerical value in the second column is the air space between the lens and the next optical element; the value in the first column corresponding to the infrared filter is the thickness of the infrared filter, and the value in the second column is the air interval between the infrared filter and the imaging plane.
TABLE 2-1
The aspheric coefficients of the lenses of this embodiment are shown in table 2-2, and a2-a16 represent aspheric coefficients of orders 2-16 of the lens surface, respectively.
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. 5 and FIG. 6, 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. The wavelengths in the graphs of the following examples are the same as those of the present example.
Third embodiment
Fig. 7 is a schematic view of an optical image capturing lens system according to a third embodiment of the present invention. As can be seen, the optical image capturing lens includes 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, a sixth lens element 36 and a seventh lens element 37, which are disposed in order from an object side to an image side along an optical axis.
The first lens 31 has positive optical power, and the object-side surface thereof is convex.
The second lens element 32 has a negative power, and has a convex object-side surface and a concave image-side surface.
The third lens element 33 has a power, a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region.
The fourth lens element 34 has positive optical power, with a convex object-side surface at the paraxial region and a convex image-side surface.
The fifth lens element 35 has a focal power, and has a concave object-side surface and a convex image-side surface.
The sixth lens element 36 has a negative power, with a convex object-side surface at the paraxial region and a concave image-side surface at the paraxial region.
The seventh lens element 37 has a negative power, and has a concave object-side surface and a concave image-side surface at a paraxial region, and has at least one inflection point on the image-side surface thereof, i.e., at least one inflection point on a longitudinal cross section of the seventh lens element from an intersection of the image-side surface thereof with the optical axis to an edge of the image-side surface thereof.
The values of the conditional expressions in the present embodiment are shown in the following table:
the optical image taking lens of the present embodiment is provided with a stop 30 on the object side of the first lens 31. An infrared filter 38 is disposed between the seventh lens 37 and the imaging surface, and infrared band light entering the optical lens assembly is filtered by the infrared filter 38, so that noise generated when infrared light irradiates the photosensitive chip is avoided. The optional filter is made of glass and does not affect the focal length.
The structural parameters of each lens of the optical image capturing lens of this embodiment are specifically shown in table 3-1, where the focal length f is 4.86mm, the aperture value Fno is 2.03, and the field angle FOV is 77.7 degrees. The unit of curvature radius, thickness and focal length in the table is mm, and surfaces 1-18 sequentially represent the surfaces from the object side to the image side, where surfaces 1-15 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, the image side of the sixth lens, the object side of the seventh lens, and the image side of the seventh lens. In the following table, in the thickness column data, the numerical value in the column corresponding to the aperture is the air gap between the aperture and the next lens; the numerical value in the first column corresponding to the same lens is the center thickness of the lens, and the numerical value in the second column is the air space between the lens and the next optical element; the value in the first column corresponding to the infrared filter is the thickness of the infrared filter, and the value in the second column is the air interval between the infrared filter and the imaging plane.
TABLE 3-1
The aspherical surface coefficients of the lenses of this embodiment are shown in Table 3-2, and A2-A16 show aspherical surface coefficients of 2 nd to 16 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. 8 and FIG. 9, 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.
The optical image-taking lens has the advantage of a large aperture, the large aperture ensures sufficient light input quantity, the light sensitivity can be effectively improved, and better imaging quality is ensured. The system adopts a structure of seven aspheric lenses, adopts a proper surface type and higher-order aspheric coefficients, can effectively correct various aberrations such as field curvature, astigmatism, magnification chromatic aberration and the like, and has better thickness ratio and sensitivity, thereby improving the process yield and reducing the production cost. In addition, each lens of the optical system is made of plastic materials, and mass production is realized by utilizing the characteristic that the plastic materials have precise mould pressing, so that the processing cost of the optical element can be greatly reduced, and the cost of the optical system is greatly reduced, and the optical system is convenient to popularize in a large range.
Correspondingly, the embodiment of the invention also provides camera equipment, which comprises an electronic photosensitive element and the optical image taking lens, wherein the electronic photosensitive element is arranged on an imaging surface of the optical image taking lens. The image pickup device adopts the optical image pickup lens, can maintain higher imaging quality and effectively shorten the overall length of the lens group under the condition of large field angle, thereby achieving lightness and thinness.
The optical image capturing lens and the image capturing apparatus provided by the present 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 (12)
1. An optical image capturing lens includes 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, which are disposed in order from an object side to an image side along an optical axis, wherein: the first lens has positive focal power, and the object side surface of the first lens is a convex surface; the second lens has negative focal power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface; the third lens has optical power; the fourth lens has positive focal power, the object side surface of the fourth lens is convex at a paraxial region, and the image side surface of the fourth lens is convex; the fifth lens has optical power; the sixth lens element has a negative optical power, a convex object-side surface at a paraxial region thereof, and a concave image-side surface at a paraxial region thereof; the seventh lens element has a negative power, a concave image-side surface at a paraxial region thereof, and at least one inflection point on the image-side surface; and satisfies the following conditional expressions: 0.2<(R41+R42)/(R41-R42)<0.8; wherein the object-side surface of the seventh lens element is concave at paraxial region;
and satisfies the following conditional expressions:
2.0<CT4/CT3<4.0；
wherein, CT3Representing the thickness of said third lens on the optical axis, CT4Represents the thickness of the fourth lens on the optical axis, R41Represents a radius of curvature, R, of an object-side surface of the fourth lens42Represents a radius of curvature of the image-side surface of the fourth lens.
2. The optical image capturing lens assembly as claimed in claim 1, wherein the third lens element has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region, and both the object-side surface and the image-side surface have at least one inflection point.
3. The optical image capturing lens of claim 2, further satisfying the following conditional expression: 1.0<R31/R32<4.0; wherein R is31Represents a radius of curvature, R, of an object-side surface of the third lens32Represents a radius of curvature of the image-side surface of the third lens.
4. The optical image capturing lens of claim 1, further satisfying the following conditional expression: 5.0<AG23/AG12<8.0，5.0<AG45/AG34<10.0，8.0<AG67/AG56<12.0 of the total weight of the mixture; wherein, AG12Represents an air space, AG, on an optical axis between the first lens and the second lens23Represents an air space, AG, on an optical axis between the second lens and the third lens34Represents an air space, AG, on an optical axis of the third lens and the fourth lens45Represents an air space, AG, of the fourth lens and the fifth lens on an optical axis56Represents an air space, AG, on an optical axis of the fifth lens and the sixth lens67Represents the sixth lens andthe seventh lens is spaced apart from air on an optical axis.
5. The optical image capturing lens of claim 1, further satisfying the following conditional expression: -6<f4/f7<-2; wherein f is4Denotes the focal length of the fourth lens, f7Denotes a focal length of the seventh lens.
6. The optical image capturing lens system as claimed in claim 1, wherein the third lens element has a negative power, and further satisfies the following conditional expression: -12.0<f3/f5<-3.0; wherein f is3Denotes the focal length of the third lens, f5Denotes a focal length of the fifth lens.
7. The optical image capturing lens of claim 1, further satisfying the following conditional expression: 0.7< f/TTL < 0.9; wherein f represents the focal length of the optical image capturing lens, and TTL represents the distance on the optical axis from the object-side surface of the first lens element to the imaging surface.
8. The optical image capturing lens of claim 1, further satisfying the following conditional expression: 0.3<SAG21+SAG22<0.5; wherein, SAG21The distance from the intersection point of the object side surface of the second lens and the optical axis to the projection point of the maximum optical effective diameter position of the object side surface of the second lens on the optical axis, SAG22And the distance from the intersection point of the image side surface of the second lens and the optical axis to the projection point of the maximum optical effective diameter position of the image side surface of the second lens on the optical axis is represented.
9. The optical image capturing lens of claim 1, further satisfying the following conditional expression: 1.0< ∑ CT- Σ AG < 3.0; Σ CT represents a sum of thicknesses of the respective first, second, third, fourth, fifth, sixth, and seventh lenses on the optical axis, and Σ AG represents a sum of air spaces between the respective adjacent lenses of the first to seventh lenses on the optical axis.
10. The optical image capturing lens as claimed in claim 9, further satisfying the condition of LCT12、LCT34、LCT56The difference between any two of the three parameters is less than 0.2, wherein the LCT12Representing the distance on the optical axis from the object-side surface of the first lens to the image-side surface of the second lens, LCT34Representing the distance on the optical axis from the object-side surface of the third lens to the image-side surface of the fourth lens, LCT56And the distance from the object side surface of the fifth lens to the image side surface of the sixth lens on the optical axis is represented.
11. The optical image capturing lens of claim 1, further satisfying the following conditional expression: -6<f5/R51+f5/R52<-2; wherein f is5Denotes a focal length, R, of the fifth lens51Represents 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.
12. An image capturing apparatus, comprising an electronic photosensitive element and the optical imaging lens system according to any one of claims 1 to 11, wherein the electronic photosensitive element is disposed on an image plane of the optical imaging lens system.
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| CN203965708U (en) * | 2013-09-11 | 2014-11-26 | 康达智株式会社 | Pick-up lens |
| CN204188865U (en) * | 2014-03-20 | 2015-03-04 | 株式会社光学逻辑 | Pick-up lens |
| CN107817586A (en) * | 2017-10-30 | 2018-03-20 | 瑞声科技(新加坡)有限公司 | Camera optical camera lens |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN203965708U (en) * | 2013-09-11 | 2014-11-26 | 康达智株式会社 | Pick-up lens |
| CN204188865U (en) * | 2014-03-20 | 2015-03-04 | 株式会社光学逻辑 | Pick-up lens |
| CN107817586A (en) * | 2017-10-30 | 2018-03-20 | 瑞声科技(新加坡)有限公司 | Camera optical camera lens |
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