CN113640973B - Optical imaging lens and imaging apparatus - Google Patents
Optical imaging lens and imaging apparatus Download PDFInfo
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- CN113640973B CN113640973B CN202111200985.9A CN202111200985A CN113640973B CN 113640973 B CN113640973 B CN 113640973B CN 202111200985 A CN202111200985 A CN 202111200985A CN 113640973 B CN113640973 B CN 113640973B
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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
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
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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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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B30/00—Camera modules comprising integrated lens units and imaging units, specially adapted for being embedded in other devices, e.g. mobile phones or vehicles
Abstract
The invention discloses an optical imaging lens and imaging equipment, the optical imaging lens comprises the following components in sequence from an object side to an imaging surface along an optical axis: the first lens with negative focal power has a convex object-side surface and a concave image-side surface; a second lens with negative focal power, wherein the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a convex surface; a third lens with positive focal power, wherein the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface; a diaphragm; a fourth lens having a positive refractive power, both the object-side surface and the image-side surface of the fourth lens being convex; the fifth lens with negative focal power has a concave object-side surface and a convex image-side surface, and the fourth lens and the fifth lens form a bonding lens group; the sixth lens with positive focal power has a convex object-side surface and a concave image-side surface. The optical imaging lens has the advantages of high illumination, large aperture and high resolution.
Description
Technical Field
The present invention relates to the field of imaging lens technology, and in particular, to an optical imaging lens and an imaging device.
Background
With the development of automatic driving technology, ADAS (Advanced Driver assistance System) has become the standard of automobiles; the vehicle-mounted camera lens is used as a key device of the ADAS, can sense the surrounding road conditions of the vehicle in real time, realizes the functions of forward collision early warning, lane deviation warning, pedestrian detection and the like, and directly influences the safety coefficient of the ADAS due to the performance of the vehicle-mounted camera lens, so that the performance requirement on the vehicle-mounted camera lens is higher and higher.
The ADAS system has extremely high requirements on the carried vehicle-mounted lens, firstly requires strong light transmission capability, can adapt to the change of brightness of the external environment, simultaneously requires the lens to have higher imaging definition, can effectively distinguish the details of the road environment, and simultaneously requires the lens to have good distinguishing capability on objects (such as traffic signal lamps, road identification information and the like) which emit or reflect monochromatic light with different wavelengths so as to meet the special requirements of an intelligent driving system. However, many lenses in the market do not satisfy the above requirements well, and therefore, it is urgent to develop an optical lens that can match the ADAS with high illumination, large aperture and high resolution.
Disclosure of Invention
Therefore, the present invention is directed to an optical imaging lens and an imaging apparatus, which have at least the features of high illumination, large aperture and high resolution.
The embodiment of the invention implements the above object by the following technical scheme.
In a first aspect, the present invention provides an optical imaging lens, comprising, in order from an object side to an imaging plane along an optical axis: the optical filter comprises a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens, a sixth lens and an optical filter; the first lens has negative focal power, and the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; the second lens has negative focal power, and the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a convex surface; the third lens has positive focal power, and the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface; the diaphragm is arranged between the third lens and the fourth lens; the fourth lens has positive focal power, and both the object side surface and the image side surface of the fourth lens are convex surfaces; the fifth lens has negative focal power, the object side surface of the fifth lens is a concave surface, the image side surface of the fifth lens is a convex surface, and the fourth lens and the fifth lens form a bonding lens group; the sixth lens has positive focal power, and the object side surface of the sixth lens is a convex surface, and the image side surface of the sixth lens is a concave surface; the first lens, the third lens, the fourth lens and the fifth lens are all glass spherical lenses, and the second lens and the sixth lens are glass aspheric lenses; the optical imaging lens meets the conditional expression: 6< TTL/IH <7, wherein TTL represents the optical total length of the optical imaging lens, and IH represents half of the maximum diameter of an effective pixel area of the optical imaging lens on an imaging surface.
In a second aspect, the present invention provides an imaging apparatus, including an imaging element and the optical imaging lens provided in the first aspect, wherein the imaging element is configured to convert an optical image formed by the optical imaging lens into an electrical signal.
Compared with the prior art, the optical imaging lens and the imaging equipment provided by the invention have the beneficial effects of good thermal stability, large aperture, convenience in assembly and the like while realizing good imaging quality through reasonable configuration of the lens surface types and reasonable collocation of the focal power; and all use glass lens, can guarantee the dependability quality of camera lens to a great extent, make it be applicable to the harsher field of environment.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural diagram of an optical imaging lens according to a first embodiment of the present invention;
FIG. 2 is a field curvature graph of an optical imaging lens according to a first embodiment of the present invention;
FIG. 3 is a contrast chart of the optical imaging lens according to the first embodiment of the present invention;
FIG. 4 is a MTF graph of an optical imaging lens according to a first embodiment of the present invention;
FIG. 5 is a schematic structural diagram of an optical imaging lens according to a second embodiment of the present invention;
FIG. 6 is a field curvature graph of an optical imaging lens according to a second embodiment of the present invention;
FIG. 7 is a contrast chart of an optical imaging lens according to a second embodiment of the present invention;
FIG. 8 is a MTF graph of an optical imaging lens according to a second embodiment of the present invention;
fig. 9 is a schematic configuration diagram of an image forming apparatus according to a third embodiment of the present invention.
Detailed Description
In order to make the objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. Several embodiments of the invention are presented in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Like reference numerals refer to like elements throughout the specification.
The invention provides an optical imaging lens, which sequentially comprises the following components from an object side to an imaging surface along an optical axis: the lens comprises a first lens, a second lens, a third lens, a diaphragm, a fourth lens, a fifth lens, a sixth lens and an optical filter;
the first lens has negative focal power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface;
the second lens has negative focal power, the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a convex surface;
the third lens has positive focal power, the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface;
the diaphragm is arranged between the third lens and the fourth lens;
the fourth lens has positive focal power, and both the object side surface and the image side surface of the fourth lens are convex surfaces;
the fifth lens has negative focal power, the object side surface of the fifth lens is a concave surface, the image side surface of the fifth lens is a convex surface, and the fourth lens and the fifth lens form a bonding lens group;
the sixth lens has positive focal power, the object side surface of the sixth lens is a convex surface, and the image side surface of the sixth lens is a concave surface;
the first lens, the third lens, the fourth lens and the fifth lens are all glass spherical lenses, and the second lens and the sixth lens are glass aspheric lenses; the optical imaging lens totally uses glass lenses, so that the reliability and quality of the lens can be ensured to a great extent, and the optical imaging lens can be suitable for the field which is harsh to the environment.
The optical imaging lens meets the following conditional expression:
6<TTL/IH<7；（1）
wherein, TTL represents the optical total length of the optical imaging lens, and IH represents half of the maximum diameter of the effective pixel area of the optical imaging lens on the imaging surface. The condition formula (1) is satisfied, the image plane of the lens can be enlarged, the total length of the lens can be compressed, the design of the lens is more miniaturized, and the lens is convenient to carry on a terminal device.
In some embodiments, the optical imaging lens satisfies the following conditional expression:
0.8<f/IH<0.9；（2）
f/ENPD<1.5；（3）
wherein f represents the focal length of the optical imaging lens, IH represents half of the maximum diameter of the effective pixel area of the optical imaging lens on the imaging surface, and ENPD represents the diameter of the entrance pupil of the optical imaging lens. Satisfying above-mentioned conditional expression (2), showing that the camera lens has great imaging surface, can satisfy the imaging demand of big target surface chip. Satisfying above-mentioned conditional expression (3), can making optical imaging lens have bigger diaphragm, all have good formation of image effect in the light and shade environment.
In some embodiments, the optical imaging lens satisfies the following conditional expression:
6<R6/R5<10；（4）
4<R11/R10<12；（5）
2<R6/TTL<3；（6）
1<R11/TTL<4；（7）
wherein R5 denotes a radius of curvature of the object-side surface of the third lens, R6 denotes a radius of curvature of the image-side surface of the third lens, R10 denotes a radius of curvature of the object-side surface of the sixth lens, R11 denotes a radius of curvature of the image-side surface of the sixth lens, and TTL denotes the total optical length of the optical imaging lens. The relative position of the pupil image of the second-time reflected ghost image on the image side surface of the third lens and the relative position of the pupil image of the second-time reflected ghost image on the image side surface of the sixth lens on the focal surface can be changed by satisfying the conditional expressions (4) to (7), the pupil image of the ghost image can be far away from the focal surface by controlling the curvature radius, the relative energy value of the ghost image is effectively reduced, and the quality of a lens imaging picture is improved.
In some embodiments, the optical imaging lens satisfies the following conditional expression:
17.5°<(CRA)max<18.5°；（8）
wherein (CRA)maxRepresenting the full view of the optical imaging lensMaximum of angle of incidence of field chief rays on the image plane. The CRA of the lens can be matched with the CRA of the large-chip photosensitive element better by meeting the conditional expression (8), and the photosensitive efficiency of the chip is improved.
In some embodiments, the optical imaging lens satisfies the following conditional expression:
-1<f4/f5<-0.6；（9）
where f4 denotes a focal length of the fourth lens, and f5 denotes a focal length of the fifth lens. The condition formula (9) is satisfied, and the effect of eliminating chromatic aberration is achieved by gluing two lenses with positive and negative focal powers.
In some embodiments, the optical imaging lens satisfies the following conditional expression:
6.8<TTL/CT2<7.8；（10）
wherein, CT2 represents the central thickness of the second lens, and TTL represents the total optical length of the optical imaging lens. Satisfying the conditional expression (10), the effect of correcting curvature of field is achieved by increasing the central thickness of the second lens.
In some embodiments, the optical imaging lens satisfies the conditional expression:
0.48<∑CT/TTL<0.55；（11）
0.16<BFL/TTL<0.20；（12）
the sum of the central thicknesses of all lenses in the optical imaging lens is represented by sigma CT, the total optical length of the optical imaging lens is represented by TTL, and the optical back focus of the optical imaging lens is represented by BFL. The total thickness of the centers of all the lenses can be reasonably configured to satisfy the conditional expression (11), the optical total length of the lens can be effectively shortened, and the miniaturization of the lens can be realized; satisfy conditional expression (12), can rationally control the back focal distance of camera lens, reduce the structural interference of camera lens body and imaging chip, be favorable to the installation of camera lens to use.
In some embodiments, the optical imaging lens satisfies the following conditional expression:
3.2<Vd4/Vd5<4；（13）
0.8<Nd4/Nd5<0.86；（14）
where Vd4 denotes an abbe number of the fourth lens, Vd5 denotes an abbe number of the fifth lens, Nd4 denotes a refractive index of the fourth lens, and Nd5 denotes a refractive index of the fifth lens. Satisfying conditional expressions (13) to (14), it is more advantageous to eliminate chromatic aberration by increasing the abbe number difference and the refractive index difference between the fourth lens and the fifth lens.
In some embodiments, the optical imaging lens satisfies the following conditional expression:
-18°<|ϕ3|-arctan[S3/(R32-S32)1/2] <18°；（15）
-14°<|ϕ4|-arctan[S4/(R42-S42)1/2] <14°；（16）
-19°<|ϕ10|-arctan[S10/(R102-S102)1/2] <19°；（17）
wherein ϕ 3 denotes a face center angle of an object-side surface of the second lens at the effective half aperture, ϕ 4 denotes a face center angle of an image-side surface of the second lens at the effective half aperture, and ϕ 10 denotes a face center angle of an object-side surface of the sixth lens at the effective half aperture; s3 denotes an effective half aperture of an object-side surface of the second lens, S4 denotes an effective half aperture of an image-side surface of the second lens, and S10 denotes an effective half aperture of an object-side surface of the sixth lens; r3 denotes a radius of curvature of the object-side surface of the second lens, R4 denotes a radius of curvature of the image-side surface of the second lens, and R10 denotes a radius of curvature of the object-side surface of the sixth lens. The conditional expressions (15) to (17) are satisfied, so that the change trend of the focal power from the center to the edge of the second lens and the sixth lens is closer to a cosine function, and the defocusing curves of all the fields are more converged when the temperature changes, which is beneficial to improving the temperature performance of the lens.
In some embodiments, the optical imaging lens satisfies the following conditional expression:
0.85<(R3-CT2)/R4<1.05；（18）
-0.9<R2/R3<-0.75；（19）
where R2 denotes a radius of curvature of the image-side surface of the first lens, R3 denotes a radius of curvature of the object-side surface of the second lens, R4 denotes a radius of curvature of the image-side surface of the second lens, and CT2 denotes a center thickness of the second lens. The second lens can be made to be approximately concentric when the conditional expression (18) is satisfied, so that the aberration of the system can be reduced, and the resolution quality can be improved; meanwhile, the adjacent surfaces of the first lens and the second lens meet the conditional expression (19), so that light rays can pass through the second lens more smoothly, and the tolerance sensitivity of the second lens is favorably reduced.
In some embodiments, the optical imaging lens satisfies the conditional expression:
-1.8<f1/f<-1.7；（20）
-7.5<f2/f<-4.5；（21）
2.5<f3/f<3.0；（22）
1.4<f4/f<1.8；（23）
-8<f5/f<-1；（24）
3.6<f6/f<4.0；（25）
where f1 denotes a focal length of the first lens, f2 denotes a focal length of the second lens, f3 denotes a focal length of the third lens, f4 denotes a focal length of the fourth lens, f5 denotes a focal length of the fifth lens, f6 denotes a focal length of the sixth lens, and f denotes a focal length of the optical imaging lens. The conditional expressions (20) to (25) are satisfied, and aberration of the system can be better corrected and imaging quality of the lens can be improved through reasonable collocation and combination of focal powers of all the lenses.
The invention is further illustrated below in the following examples. In each embodiment, the thickness, the curvature radius, and the material selection part of each lens in the optical imaging lens are different, and the specific difference can be referred to the parameter table of each embodiment. The following examples are only preferred embodiments of the present invention, but the embodiments of the present invention are not limited only by the following examples, and any other changes, substitutions, combinations or simplifications which do not depart from the innovative points of the present invention should be construed as being equivalent substitutions and shall be included within the scope of the present invention.
As an embodiment, when the lenses in the optical imaging lens are aspheric lenses, the aspheric surface shapes each satisfy the following equation:
wherein z represents the distance in the optical axis direction from the curved surface vertex, c represents the curvature of the curved surface vertex, K represents the conic coefficient, h represents the distance from the optical axis to the curved surface, and B, C, D, E and F represent the fourth, sixth, eighth, tenth and twelfth order curved surface coefficients, respectively.
First embodiment
Referring to fig. 1, a schematic structural diagram of an optical imaging lens 100 according to a first embodiment of the present invention is shown, where the optical imaging lens 100 sequentially includes, from an object side to an image plane along an optical axis: a first lens L1, a second lens L2, a third lens L3, a stop ST, a fourth lens L4, a fifth lens L5, a sixth lens L6, and a filter G1.
The first lens L1 has negative focal power, the object-side surface S1 of the first lens is convex, and the image-side surface S2 of the first lens is concave;
the second lens L2 has negative focal power, the object-side surface S3 of the second lens is concave, and the image-side surface S4 of the second lens is convex;
the third lens L3 has positive focal power, the object-side surface S5 of the third lens is convex, and the image-side surface S6 of the third lens is concave;
the stop ST is disposed between the third lens L3 and the fourth lens L4;
the fourth lens L4 has positive focal power, and both the object-side surface S7 and the image-side surface of the fourth lens are convex;
the fifth lens L5 has negative focal power, the object-side surface of the fifth lens is concave, the image-side surface S9 of the fifth lens is convex, and the fourth lens L4 and the fifth lens L5 form a bonded lens group, namely, the bonded surface of the image-side surface of the fourth lens and the object-side surface of the fifth lens is S8;
the sixth lens L6 has positive refractive power, and the object-side surface S10 of the sixth lens is convex, and the image-side surface S11 of the sixth lens is concave;
the first lens L1, the third lens L3, the fourth lens L4 and the fifth lens L5 are all glass spherical lenses, and the second lens L2 and the sixth lens L6 are glass spherical lenses.
Please refer to table 1, which shows the related parameters of each lens of the optical imaging lens system 100 according to the first embodiment of the present invention.
TABLE 1
In this embodiment, the parameters of each lens aspheric surface of the optical imaging lens 100 are shown in table 2.
TABLE 2
Referring to fig. 2, fig. 3 and fig. 4, a field curvature graph, a relative illumination graph and an MTF graph of the optical imaging lens 100 in the present embodiment are respectively shown.
The field curvature curve of fig. 2 indicates the degree of curvature of the meridional image plane and the sagittal image plane. In fig. 2, the horizontal axis represents the offset amount (unit: mm) and the vertical axis represents the angle of view (unit: degree). As can be seen from fig. 2, the field curvature of the meridional image plane and the sagittal image plane in the full field of view is within ± 0.1mm, which indicates that the field curvature correction of the optical imaging lens is good.
The relative illuminance curve of fig. 3 represents the relative illuminance values for different field angles on the imaging plane. In fig. 3, the horizontal axis represents the Y field of view (unit: degree) and the vertical axis represents the value of relative illuminance. As can be seen from fig. 3, the relative contrast value at the maximum half field angle is still greater than 80%, indicating that the optical imaging lens has high relative contrast.
The MTF curves of fig. 4 represent paraxial MTFs for different spatial frequencies. In fig. 4, the horizontal axis represents spatial frequency (unit: line pair/mm), and the vertical axis represents MTF values. As can be seen from fig. 4, the paraxial MTF value at the maximum spatial frequency is still 0.58 or more, which indicates that the paraxial aberration of the optical imaging lens is well corrected.
Second embodiment
Referring to fig. 5, a schematic structural diagram of an optical imaging lens 200 according to a second embodiment of the present invention is shown, where the optical imaging lens 200 in this embodiment is substantially the same as the optical imaging lens 100 in the first embodiment, but the difference is that curvature radius, material, thickness, etc. of each lens are different, and specific parameters of each lens are shown in table 3.
TABLE 3
In this embodiment, the parameters of each lens aspheric surface of the optical imaging lens 200 are shown in table 4.
TABLE 4
Referring to fig. 6, fig. 7 and fig. 8, a field curvature graph, a relative illumination graph and an MTF graph of the optical imaging lens in the present embodiment are respectively shown. As can be seen from fig. 6, the field curvature of the meridional image plane and the sagittal image plane in the full field of view is within ± 0.1mm, which indicates that the field curvature correction of the optical imaging lens is good. As can be seen from fig. 7, the relative contrast value at the maximum half field angle is still greater than 80%, indicating that the optical imaging lens has high relative contrast. As can be seen from fig. 8, the paraxial MTF value at the maximum spatial frequency is still 0.55 or more, which indicates that the paraxial aberration of the optical imaging lens is well corrected.
Table 5 shows the corresponding optical characteristics in the above embodiments, including the focal length F, total optical length TTL, field angle FOV, F # of the optical imaging lens, and the corresponding numerical values for each of the aforementioned conditions.
TABLE 5
In summary, the optical imaging lens of the invention adopts six glass lenses, and through reasonable configuration of the surface types of the lenses and reasonable collocation of the focal power, the lens has the beneficial effects of good thermal stability, large aperture, convenience in assembly and the like while realizing good imaging quality; and all use glass lens, can guarantee the dependability quality of camera lens to a great extent, make it be applicable to the harsher field of environment.
Third embodiment
Referring to fig. 9, an imaging device 300 according to a third embodiment of the present invention is shown, where the imaging device 300 may include an imaging element 310 and an optical imaging lens (e.g., the optical imaging lens 100) in any of the embodiments described above. The imaging element 310 may be a CMOS (Complementary Metal Oxide Semiconductor) image sensor, and may also be a CCD (Charge Coupled Device) image sensor.
The imaging device 300 may be a vehicle-mounted image pickup device, a security monitor, a motion camera, or any other electronic device equipped with the optical imaging lens.
The imaging device 300 provided by the embodiment of the application includes the optical imaging lens 100, and since the optical imaging lens 100 has the advantages of high illuminance, large aperture and high resolution, the imaging device 300 having the optical imaging lens 100 also has the advantages of high illuminance, large aperture and high resolution.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. An optical imaging lens, characterized in that, six lenses in total, from an object side to an imaging surface along an optical axis, sequentially comprise:
the lens comprises a first lens with negative focal power, a second lens and a third lens, wherein the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface;
the second lens is provided with negative focal power, the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a convex surface;
the lens comprises a third lens with positive focal power, wherein the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface;
a diaphragm;
the fourth lens is provided with positive focal power, and the object side surface and the image side surface of the fourth lens are convex surfaces;
the lens system comprises a fifth lens with negative focal power, a second lens and a third lens, wherein the object side surface of the fifth lens is a concave surface, the image side surface of the fifth lens is a convex surface, and the fourth lens and the fifth lens form a bonding lens group;
the sixth lens is provided with positive focal power, the object side surface of the sixth lens is a convex surface, and the image side surface of the sixth lens is a concave surface;
the first lens, the third lens, the fourth lens and the fifth lens are all glass spherical lenses, and the second lens and the sixth lens are glass aspheric lenses;
the optical imaging lens meets the conditional expression:
6<TTL/IH<7；
-1<f4/f5<-0.6；
wherein, TTL represents the total optical length of the optical imaging lens, IH represents half of the maximum diameter of the effective pixel area of the optical imaging lens on the imaging plane, f4 represents the focal length of the fourth lens, and f5 represents the focal length of the fifth lens.
2. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the conditional expression:
0.8<f/IH<0.9；
f/ENPD<1.5；
wherein f represents the focal length of the optical imaging lens, IH represents half of the maximum diameter of the effective pixel area of the optical imaging lens on the imaging surface, and ENPD represents the diameter of the entrance pupil of the optical imaging lens.
3. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the conditional expression:
6<R6/R5<10；
4<R11/R10<12；
2<R6/TTL<3；
1<R11/TTL<4；
wherein R5 denotes a radius of curvature of the object-side surface of the third lens, R6 denotes a radius of curvature of the image-side surface of the third lens, R10 denotes a radius of curvature of the object-side surface of the sixth lens, R11 denotes a radius of curvature of the image-side surface of the sixth lens, and TTL denotes a total optical length of the optical imaging lens.
4. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the conditional expression:
17.5°<(CRA)max<18.5°；
wherein (CRA)maxAnd the maximum value of the incidence angle of the chief ray of the optical imaging lens in the full field of view on the image plane is represented.
5. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the conditional expression:
6.8<TTL/CT2<7.8；
wherein, CT2 represents the central thickness of the second lens, and TTL represents the total optical length of the optical imaging lens.
6. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the conditional expression:
0.48<∑CT/TTL<0.55；
0.16<BFL/TTL<0.20；
the sum of the central thicknesses of all lenses in the optical imaging lens is represented by sigma CT, the total optical length of the optical imaging lens is represented by TTL, and the optical back focus of the optical imaging lens is represented by BFL.
7. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the conditional expression:
-18°<|ϕ3|-arctan[S3/(R32-S32)1/2] <18°；
-14°<|ϕ4|-arctan[S4/(R42-S42)1/2] <14°；
-19°<|ϕ10|-arctan[S10/(R102-S102)1/2] <19°；
wherein ϕ 3 denotes a face center angle of an object-side surface of the second lens at the effective half aperture, ϕ 4 denotes a face center angle of an image-side surface of the second lens at the effective half aperture, and ϕ 10 denotes a face center angle of an object-side surface of the sixth lens at the effective half aperture; s3 denotes an effective half aperture of an object side surface of the second lens, S4 denotes an effective half aperture of an image side surface of the second lens, and S10 denotes an effective half aperture of an object side surface of the sixth lens; r3 denotes a radius of curvature of an object-side surface of the second lens, R4 denotes a radius of curvature of an image-side surface of the second lens, and R10 denotes a radius of curvature of an object-side surface of the sixth lens.
8. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the conditional expression:
-0.9<R2/R3<-0.75；
0.85<(R3-CT2)/R4<1.05；
wherein R2 denotes a radius of curvature of an image-side surface of the first lens, R3 denotes a radius of curvature of an object-side surface of the second lens, R4 denotes a radius of curvature of an image-side surface of the second lens, and CT2 denotes a center thickness of the second lens.
9. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the conditional expression:
-1.8<f1/f<-1.7；
-7.5<f2/f<-4.5；
2.5<f3/f<3.0；
1.4<f4/f<1.8；
-8<f5/f<-1；
3.6<f6/f<4.0；
wherein f1 denotes a focal length of the first lens, f2 denotes a focal length of the second lens, f3 denotes a focal length of the third lens, f6 denotes a focal length of the sixth lens, and f denotes a focal length of the optical imaging lens.
10. An imaging apparatus comprising the optical imaging lens according to any one of claims 1 to 9 and an imaging element for converting an optical image formed by the optical imaging lens into an electric signal.
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