CN108802969B - Optical imaging lens group - Google Patents

Optical imaging lens group Download PDF

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CN108802969B
CN108802969B CN201810538970.5A CN201810538970A CN108802969B CN 108802969 B CN108802969 B CN 108802969B CN 201810538970 A CN201810538970 A CN 201810538970A CN 108802969 B CN108802969 B CN 108802969B
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lens
optical
image
optical imaging
lens group
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CN108802969A (en
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林肖怡
章彬炜
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Guangdong Xuye Optoelectronics Technology Co Ltd
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Guangdong Xuye Optoelectronics Technology Co Ltd
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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
    • G02B13/004—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 four lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration

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Abstract

The invention discloses an optical imaging lens group, which comprises a first lens, a second lens, a third lens and a fourth lens which are arranged in sequence 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 has a concave image-side surface; the third lens element with positive refractive power has a convex image-side surface; the fourth lens element with negative refractive power has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region. Each lens of the optical imaging lens group adopts reasonable surface shape structure and optimal range combination of optical parameters of each lens, and high imaging quality can be kept. The relationship between the optical effective diameters of the object side surface of the first lens and the image side surface of the third lens and the relationship between the optical effective diameters of the image side surface of the third lens and the object side surface of the fourth lens are optimally configured, so that the head of the optical lens group is miniaturized under the condition of keeping high imaging quality, and the application requirement can be met.

Description

Optical imaging lens group
Technical Field
The invention relates to the technical field of optical imaging devices, in particular to an optical imaging lens group.
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 camera modules. For portable terminals such as smart phones and tablet computers, an optical camera module has become one of the main selling points.
At present, some portable mobile electronic devices are continuously developed towards a high screen ratio, for example, smart phones, the space of the upper part and the lower part of the screen is narrower and narrower, and the portable mobile electronic devices continuously tend to be full-screen, which requires the lens of the optical camera module to be more miniaturized to adapt to the development trend.
Disclosure of Invention
The invention aims to provide an optical imaging lens group which is adapted to an optical camera module, has smaller head space under the condition of keeping high imaging quality and can be miniaturized in structure.
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 and a fourth lens which are arranged in sequence 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 has a concave image-side surface;
the third lens element with positive refractive power has a convex image-side surface;
the fourth lens element with negative refractive power has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;
and satisfies the following conditional expressions:
1.6<DM41/DM32<2.0；
DM32/DM11<1.8；
wherein, DM11Representing an optical effective diameter value, DM, of an object-side surface of said first lens32Representing an optical effective diameter value, DM, of an image-side surface of said third lens41And the optical effective diameter value of the object side surface of the fourth lens is represented.
Preferably, the image-side surface of the first lens element is convex, and the object-side surface of the second lens element is convex at the paraxial region.
Preferably, the following conditional expression is also satisfied: 1.0<(R21+R22)/(R21-R22)<4.0 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 expression is also satisfied: 2.0<CT3/ET3<3.0 of, among others, CT3Denotes the thickness of the third lens on the optical axis, ET3Representing the edge thickness of the third lens.
Preferably, the following conditional expression is also satisfied: 0.6< f/TTL <0.8, wherein f represents the focal length of the optical imaging lens group, and TTL represents the distance between the object side surface of the first lens and the imaging surface on the optical axis.
Preferably, the following conditional expression is also satisfied: sigma ETi-ΣEAj<0.7, i ═ 1,2,3,4, j ═ 1,2,3, ETiDenotes the edge thickness, EA, of the ith lensjIndicating the air separation distance between the jth lens edge and the jth +1 lens edge.
Preferably, the following conditional expression is also satisfied:1.0<ET1/ET2<1.6, wherein, ET1Denotes the edge thickness, ET, of the first lens2Representing the edge thickness of the second lens.
Preferably, the following conditional expression is also satisfied: 5.0<f2/f4<10.0, wherein f2Denotes the focal length of the second lens, f4Denotes a focal length of the fourth lens.
Preferably, the following conditional expression is also satisfied: 8<R41/R42<14, wherein 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.
Preferably, the following conditional expression is also satisfied: 3.0<f1/CT1<6 wherein f1Denotes the focal length, CT, of the first lens1Represents the thickness of the first lens on the optical axis.
In view of the foregoing technical solutions, an optical imaging lens assembly provided by the present invention includes a first lens, a second lens, a third lens, and a fourth lens sequentially disposed from an object side to an image side along an optical axis, where an object light sequentially passes through the lenses to form an image on an image plane located at the image side of the fourth lens.
According to the optical imaging lens group, each lens adopts a reasonable surface shape structure and the optimal range combination of the optical parameters of each lens, so that high imaging quality can be kept. The relationship between the optical effective diameters of the object side surface of the first lens and the image side surface of the third lens and the relationship between the optical effective diameters of the image side surface of the third lens and the object side surface of the fourth lens are optimally configured, so that the head of the optical lens group is miniaturized under the condition of keeping high imaging quality, the structure can be miniaturized, and the application requirements can be met.
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 distortion curvature of an optical imaging lens assembly according to a first embodiment of the present invention;
FIG. 3 is a spherical aberration diagram of an optical imaging lens assembly according to a first embodiment of the present invention;
FIG. 4 is a diagram illustrating an optical imaging lens assembly according to a second embodiment of the present invention;
FIG. 5 is a distortion field diagram of an optical imaging lens assembly according to a second embodiment of the present invention;
FIG. 6 is a spherical aberration diagram of an optical imaging lens assembly according to a second embodiment of the present invention;
FIG. 7 is a diagram illustrating an optical imaging lens assembly according to a third embodiment of the present invention;
FIG. 8 is a distortion curvature diagram of an optical imaging lens assembly according to a third embodiment of the present invention;
FIG. 9 is a spherical aberration diagram of an optical imaging lens assembly according to a 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 imaging lens assembly, including a first lens, a second lens, a third lens, and a fourth lens arranged in order 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 has a concave image-side surface;
the third lens element with positive refractive power has a convex image-side surface;
the fourth lens element with negative refractive power has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;
and satisfies the following conditional expressions:
1.6<DM41/DM32<2.0；
DM32/DM11<1.8；
wherein, DM11Representing an optical effective diameter value, DM, of an object-side surface of said first lens32Representing an optical effective diameter value, DM, of an image-side surface of said third lens41And the optical effective diameter value of the object side surface of the fourth lens is represented.
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.
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.
According to the optical imaging lens group, object light rays sequentially pass through the first lens, the second lens, the third lens and the fourth lens to be imaged on an imaging surface located on the image side of the fourth lens. The first lens element with positive refractive power has a convex object-side surface, and can provide main light converging capability for the optical lens element. The second lens element with negative refractive power is matched with the first lens element with positive refractive power to form a positive-negative telescope structure, thereby effectively shortening the length of the optical lens assembly. The third lens element with positive refractive power can share the positive refractive power of the first lens element, and can correct part of spherical aberration to improve imaging quality. The object side surface of the fourth lens is convex at the position of a dipped optical axis, and the image side surface of the fourth lens is concave at the position of the dipped optical axis, so that the trend of an optical path can be effectively controlled, and the image height can be improved to achieve high pixels.
In the optical imaging lens group, the optical effective diameter values of the object side surface of the first lens and the image side surface of the third lens meet the conditional expression DM32/DM11<1.8, the optical effective diameter values of the object side surface of the fourth lens and the image side surface of the third lens meet the conditional expression 1.6<DM41/DM32<2.0, the optical imaging lens group can have smaller head space under the condition of keeping high imaging quality. If the lower limit is exceeded, the head of the lens group is too large, and the design requirement of the equipment on the structural size of the camera module cannot be met; if the maximum value is exceeded, the aberrations such as astigmatism and spherical aberration of the lens group become worse, and the imaging quality requirement cannot be met.
Therefore, the optical imaging lens group provided by the embodiment is adapted to an optical camera module, has a smaller head space under the condition of keeping high imaging quality, can be miniaturized structurally, and can meet application requirements.
In one preferred embodiment, the image-side surface of the first lens element is convex, and the object-side surface of the second lens element is convex at a paraxial region.
More specifically, the curvature radii of the object-side surface and the image-side surface of the second lens satisfy the following conditional expressions: 1.0<(R21+R22)/(R21-R22)<4.0 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. By better adjusting the curvature radius of the second lens, the shape of the second lens is smoother and is beneficial to molding, and meanwhile, the correction of partial astigmatism can be enhanced.
Preferably, in the optical imaging lens group, the third lens further satisfies the following conditional expression: 2.0<CT3/ET3<3.0 of, among others, CT3Represents the firstThickness of the three lenses on the optical axis, ET3Representing the edge thickness of the third lens. By controlling the center thickness and the edge thickness of the third lens in the middle, the problem that the thickness ratio of the lens is too large or too small can be effectively improved, so that the difficulty in molding production or poor molding can be avoided.
Preferably, the present optical imaging lens group further satisfies the following conditional expressions: 0.6< f/TTL <0.8, wherein f represents the focal length of the optical imaging lens group, and TTL represents the distance between the object side surface of the first lens and the imaging surface on the optical axis. The ratio of the focal length to the total length of the lens group is limited, so that the lens group is in a reasonable range, the overall performance and the structure of the lens group can be effectively optimized, and the overall structure is compact and convenient to miniaturize.
Preferably, the present optical imaging lens group further satisfies the following conditional expressions: sigma ETi-ΣEAj<0.7, i ═ 1,2,3,4, j ═ 1,2,3, ETiDenotes the edge thickness, EA, of the ith lensjIndicating the air separation distance between the jth lens edge and the jth +1 lens edge. The pitch and thickness of each lens of the optical system can be adjusted as a whole.
More specifically, the first lens and the second lens further satisfy the following conditional expressions: 1.0<ET1/ET2<1.6, wherein, ET1Denotes the edge thickness, ET, of the first lens2Representing the edge thickness of the second lens. The arrangement can further adjust the structures of the front two lenses which have larger influence, can effectively shorten the length of part of the lenses, and is beneficial to shortening the whole length of the lens group to achieve lightness and thinness.
Preferably, the present optical imaging lens group further satisfies the following conditional expressions: 5.0<f2/f4<10.0, wherein f2Denotes the focal length of the second lens, f4Denotes a focal length of the fourth lens. The refractive power of the two lenses can be effectively distributed, the problem that the refractive power of the individual lens is too large or too small is avoided, and the sensitivity of the lens is reduced.
Preferably, in the optical imaging lens group, the fourth lens further satisfies the following conditional expression: 8<R41/R42<14, wherein 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. The curvature radius of the last lens is further controlled, the surface shape of the last lens is adjusted to suppress the incident angle of light entering an imaging surface, and the phenomenon that the light cannot be focused on a photosensitive area due to the fact that the incident angle of the chief ray is too large, and the image is dark or discolored is avoided.
Preferably, the first lens of the optical imaging lens group further satisfies the following conditional expression: 3.0<f1/CT1<6 wherein f1Denotes the focal length, CT, of the first lens1Represents the thickness of the first lens on the optical axis. The method is used for limiting the range of the ratio between the focal length of the first lens and the central thickness of the first lens, and if the ratio of the first lens exceeds the upper limit of 6.0, the focal length of the first lens is too large or the central thickness of the first lens is too small, and the sensitivity of the first lens is poor and the process molding conditions are more limited. If this ratio is below the lower limit of 3.0, it means that the focal length of the first lens is too small or the center thickness is too thick, which is also disadvantageous for lens shaping and sensitivity optimization.
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 the present embodiment includes a first lens 11, a second lens 12, a third lens 13, and a fourth lens 14, which are sequentially disposed from an object side to an image side along an optical axis.
The first lens element 11 with positive refractive power has a convex object-side surface.
The second lens element 12 with negative refractive power has a concave image-side surface.
The third lens element 13 with positive refractive power has a convex image-side surface.
The fourth lens element 14 with negative refractive power has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region.
The values of the conditional expressions in the present embodiment are shown in the following table:
Figure GDA0002782796080000071
the optical imaging lens group of the present embodiment is provided with a diaphragm 10 on the object side of a first lens 11. An infrared filter 15 is arranged between the fourth lens 14 and the imaging surface, and infrared band light entering the optical lens group is filtered through the infrared filter 15, 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 shown in table 1-1, wherein the focal length f is 2.28mm, the aperture value Fno is 2.10, and the field angle FOV is 86.8 degrees. In the table, the unit of the radius of curvature, the thickness and the focal length is mm, and the surfaces 1 to 12 sequentially represent the surfaces from the object side to the image side, wherein the surfaces 1 to 9 sequentially represent the aperture, the object side surface of the first lens, the image side surface of the first lens, the object side surface of the second lens, the image side surface of the second lens, the object side surface of the third lens, the image side surface of the third lens, the object side surface of the fourth lens and the image side surface of the fourth 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
Figure GDA0002782796080000081
Each lens in the optical imaging system adopts an aspheric surface design, and the curve equation of the aspheric surface is expressed as follows:
Figure GDA0002782796080000082
wherein X represents a distance Y from the optical axis on the aspheric surfaceA point, its relative height to a tangent plane tangent to a 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.
Figure GDA0002782796080000091
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 imaging lens assembly according to a second embodiment of the present invention. As can be seen from the figure, the optical imaging lens group of the present embodiment includes a first lens 21, a second lens 22, a third lens 23, and a fourth lens 24, which are sequentially disposed from an object side to an image side along an optical axis.
The first lens element 21 with positive refractive power has a convex object-side surface.
The second lens element 22 with negative refractive power has a concave image-side surface.
The third lens element 23 with positive refractive power has a convex image-side surface.
The fourth lens element 24 with negative refractive power has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region.
The values of the conditional expressions in the present embodiment are shown in the following table:
Figure GDA0002782796080000101
the optical imaging lens group of the present embodiment is provided with a diaphragm 20 on the object side of a first lens 21. An infrared filter 25 is arranged between the fourth lens 24 and the imaging surface, and infrared band light entering the optical lens group is filtered by the infrared filter 25, 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 2.27mm, the aperture value Fno is 2.10, and the field angle FOV is 86.8 degrees. In the table, the unit of the radius of curvature, the thickness and the focal length is mm, and the surfaces 1 to 12 sequentially represent the surfaces from the object side to the image side, wherein the surfaces 1 to 9 sequentially represent the aperture, the object side surface of the first lens, the image side surface of the first lens, the object side surface of the second lens, the image side surface of the second lens, the object side surface of the third lens, the image side surface of the third lens, the object side surface of the fourth lens and the image side surface of the fourth 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
Figure GDA0002782796080000111
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.
Figure GDA0002782796080000112
Figure GDA0002782796080000121
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.
Third embodiment
Fig. 7 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 a first lens 31, a second lens 32, a third lens 33, and a fourth lens 34, which are sequentially disposed from an object side to an image side along an optical axis.
The first lens element 31 with positive refractive power has a convex object-side surface.
The second lens element 32 with negative refractive power has a concave image-side surface.
The third lens element 33 with positive refractive power has a convex image-side surface.
The fourth lens element 34 with negative refractive power has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region.
The values of the conditional expressions in the present embodiment are shown in the following table:
Figure GDA0002782796080000131
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 35 is arranged between the fourth lens 34 and the imaging surface, and infrared band light entering the optical lens group is filtered by the infrared filter 35, 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 2.28mm, the aperture value Fno is 2.10, and the field angle FOV is 86.8 degrees. In the table, the unit of the radius of curvature, the thickness and the focal length is mm, and the surfaces 1 to 12 sequentially represent the surfaces from the object side to the image side, wherein the surfaces 1 to 9 sequentially represent the aperture, the object side surface of the first lens, the image side surface of the first lens, the object side surface of the second lens, the image side surface of the second lens, the object side surface of the third lens, the image side surface of the third lens, the object side surface of the fourth lens and the image side surface of the fourth 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
Figure GDA0002782796080000141
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.
Figure GDA0002782796080000142
Figure GDA0002782796080000151
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 imaging lens group has the advantage of a large aperture, and the large aperture ensures sufficient light input quantity, can effectively improve light sensitivity and ensures better imaging quality. The system adopts a structure of four 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.
The optical imaging lens group provided by the invention is 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 (10)

1. An optical imaging lens group is characterized by comprising a first lens, a second lens, a third lens and a fourth lens which are arranged in sequence 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 has a concave image-side surface;
the third lens element with positive refractive power has a convex image-side surface;
the fourth lens element with negative refractive power has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;
and satisfies the following conditional expressions:
1.6<DM41/DM32<2.0；
DM32/DM11<1.8；
wherein, DM11Representing an optical effective diameter value, DM, of an object-side surface of said first lens32Representing an optical effective diameter value, DM, of an image-side surface of said third lens41And the optical effective diameter value of the object side surface of the fourth lens is represented.
2. The optical imaging lens group of claim 1, wherein the first lens element has a convex image-side surface and the second lens element has a convex object-side surface at a paraxial region.
3. The optical imaging lens group of claim 2, further satisfying the following conditional expression: 1.0<(R21+R22)/(R21-R22)<4.0 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.
4. An optical imaging lens group according to claim 1, further satisfying the following conditional expression: 2.0<CT3/ET3<3.0 of, among others, CT3Denotes the thickness of the third lens on the optical axis, ET3Representing the edge thickness of the third lens.
5. An optical imaging lens group according to claim 1, further satisfying the following conditional expression: 0.6< f/TTL <0.8, wherein f represents the focal length of the optical imaging lens group, and TTL represents the distance between the object side surface of the first lens and the imaging surface on the optical axis.
6. An optical imaging lens group according to claim 1, further satisfying the following conditional expression: sigma ETi-ΣEAj<0.7, i ═ 1,2,3,4, j ═ 1,2,3, ETiDenotes the edge thickness, EA, of the ith lensjIndicating the air separation distance between the jth lens edge and the jth +1 lens edge.
7. The optical imaging lens group of claim 6, further satisfying the following conditional expression: 1.0<ET1/ET2<1.6, wherein, ET1Denotes the edge thickness, ET, of the first lens2Representing the edge thickness of the second lens.
8. An optical imaging lens group according to claim 1, further satisfying the following conditional expression: 5.0<f2/f4<10.0, wherein f2Denotes the focal length of the second lens, f4Denotes a focal length of the fourth lens.
9. An optical imaging lens group according to claim 1, further satisfying the following conditional expression: 8<R41/R42<14, wherein 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.
10. An optical imaging lens group according to claim 1, further satisfying the following conditional expression: 3.0<f1/CT1<6 wherein f1Denotes the focal length, CT, of the first lens1Represents the thickness of the first lens on the optical axis.
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