CN113900237A - Optical imaging lens and imaging apparatus - Google Patents

Optical imaging lens and imaging apparatus Download PDF

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Publication number
CN113900237A
CN113900237A CN202111502652.1A CN202111502652A CN113900237A CN 113900237 A CN113900237 A CN 113900237A CN 202111502652 A CN202111502652 A CN 202111502652A CN 113900237 A CN113900237 A CN 113900237A
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lens
optical imaging
image
imaging lens
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CN113900237B (en
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廖宝发
魏文哲
王克民
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Jiangxi Lianchuang Electronic Co Ltd
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Jiangxi Lianchuang Electronic 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
    • 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
    • G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
    • G02B1/041—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
    • 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 image side surface of the first lens is a concave surface; a second lens with negative focal power, wherein 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 image side surface of the third lens is a convex 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; a fifth lens element with negative optical power, having a convex object-side surface at paraxial region and an inflection point, and a concave image-side surface; and the object side surface and the image side surface of the sixth lens with positive focal power are convex surfaces. The optical imaging lens has the advantages of high resolution, large aperture, low production cost and high yield.

Description

Optical imaging lens and imaging apparatus
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
In recent years, with the explosive development of the automobile industry, automation and in-vehicle monitoring and sensing systems are rapidly developed, and the vehicle-mounted lens is rapidly developed as a key component of an automatic driving assistance system. The imaging quality and reliability of the on-board lens are being considered more and more by automobile manufacturers.
With the development of the automatic driving technology, the advanced assistant driving system becomes the standard of the automobile, the vehicle-mounted lens is used as an indispensable medium for the automobile to acquire external environment information, the quantity demand is more and more large, and the urgent demands of the automobile industry are to reduce the cost of the vehicle-mounted lens and improve the imaging quality. Meanwhile, the advanced assistant driving system has extremely high requirements on the carried vehicle-mounted lens, and firstly, the advanced assistant driving system requires strong light transmission capability, can adapt to the light and shade change of the external environment, and simultaneously requires the lens to have higher imaging definition, and can effectively distinguish the details of the road environment. However, most lenses in the existing market can not well meet the requirements, and the traditional vehicle-mounted lens with high image quality adopts a mode of adding lenses or using glass aspheric surfaces in order to improve the imaging quality, so that the production cost is greatly improved by adding the lenses or adding the aspheric glass lenses, and the popularization and the application in the market are not facilitated.
Disclosure of Invention
Therefore, the present invention is directed to an optical imaging lens and an imaging apparatus, which have the advantages of high resolution, large aperture, low production cost, and high yield.
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 lens comprises a first lens with negative focal power, wherein the image side surface of the first lens is a concave surface; the second lens with negative focal power is characterized in that 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 image side surface of the third lens is a convex 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; a fifth lens element having a negative optical power, an object-side surface of the fifth lens element being convex at a paraxial region and having an inflection point, an image-side surface of the fifth lens element being concave; the sixth lens has positive focal power, and both the object-side surface and the image-side surface of the sixth lens are convex surfaces; the optical imaging lens meets the conditional expression: 0.15< CT34/TTL < 0.25; wherein CT34 represents the air space between the third lens and the fourth lens, and TTL represents the total optical length of the optical imaging lens.
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 device provided by the invention adopt six lenses with specific focal power and use a glass-plastic mixed lens structure, because the plastic lens adopts an injection molding production mode, the surface type freedom degree of the plastic lens is much higher than that of a glass aspheric surface, an adhesive body for eliminating dispersion can be replaced by the special surface type, and the compression process tolerance of an injection molding process relative to the glass aspheric surface is much smaller, so that the optical imaging lens and the imaging device have the advantages of low cost and high yield, and have higher manufacturability. In addition, the optical imaging lens has the advantages of good chromatic aberration correction, low chromatic dispersion, high resolution and large aperture within the wave band range of 450nm-650nm through specific surface shape collocation and reasonable optical power distribution.
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 an MTF chart of an optical imaging lens according to a first embodiment of the present invention;
FIG. 3 is a vertical axis chromatic aberration diagram of the optical imaging lens according to the first embodiment of the present invention;
FIG. 4 is a graph of Monte Carlo yield analysis of an imaging lens according to a first embodiment of the present application;
FIG. 5 is a schematic structural diagram of an optical imaging lens according to a second embodiment of the present invention;
FIG. 6 is an MTF chart of an optical imaging lens according to a second embodiment of the present invention;
FIG. 7 is a vertical axis chromatic aberration diagram of an optical imaging lens according to a second embodiment of the present invention;
FIG. 8 is a graph of Monte Carlo yield analysis of an imaging lens according to a second embodiment of the present application;
FIG. 9 is a schematic structural diagram of an optical imaging lens system according to a third embodiment of the present invention;
FIG. 10 is an MTF chart of an optical imaging lens according to a third embodiment of the present invention;
FIG. 11 is a vertical axis chromatic aberration diagram of an optical imaging lens according to a third embodiment of the present invention;
FIG. 12 is a graph of Monte Carlo yield analysis of an imaging lens according to a third embodiment of the present application;
fig. 13 is a schematic configuration diagram of an image forming apparatus according to a fourth 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, an optical filter and protective glass.
A first lens in the optical imaging lens has negative focal power, 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 convex surface, and the image side surface of the second lens is a concave surface;
the third lens has positive focal power, and the image side surface of the third lens is a convex surface;
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 convex at a paraxial region and has an inflection point, and the image side surface of the fifth lens is concave;
the sixth lens has positive focal power, and both the object-side surface and the image-side surface of the sixth lens are convex surfaces.
The first lens and the third lens are glass spherical lenses, and the second lens, the fourth lens, the fifth lens and the sixth lens are plastic aspheric lenses.
Further, the optical imaging lens satisfies the conditional expression:
0.15<CT34/TTL<0.25；（1）
wherein, CT34 represents the air space between the third lens and the fourth lens, and TTL represents the total optical length of the optical imaging lens. The space interval between the front lens and the rear lens of the diaphragm can be effectively increased, especially the distance between the third lens and the diaphragm is increased, so that the light gathering degree before and after the diaphragm is small, the tolerance sensitivity of a system can be effectively reduced, and the production yield of finished products is improved.
In some embodiments, the optical imaging lens satisfies the conditional expression:
-0.25<D11/R11<0.25； (2)
where R11 denotes a radius of curvature of an object-side surface of the first lens, and D11 denotes a clear aperture of the object-side surface of the first lens. The condition formula (2) is met, and the surface shape of the first lens can be enabled to tend to a plane by controlling the caliber and the surface shape of the first lens, so that a scene in a larger range can be shot, and the wide-angle effect of the lens is realized; meanwhile, the incident angle of light rays entering the first lens is controlled, the incident angle of each view field on the object side surface of the first lens is uniform, and the relative illumination of each view field is uniform.
In some embodiments, the optical imaging lens satisfies the conditional expression:
5<R51/f<12；（3）
5<R51/R52<15；（4）
wherein R51 denotes a radius of curvature of an object side surface of the fifth lens, R52 denotes a radius of curvature of an image side surface of the fifth lens, and f denotes a focal length of the optical imaging lens. The condition formulas (3) and (4) are satisfied, so that the incident angle and the emergent angle of the light rays of the central view field and the edge view field of the optical imaging lens on the fifth lens can be controlled, the illumination difference of the central view field and the edge view field can be reduced, and the ghost energy generated by reflection of the light rays of the edge view field can be reduced.
In some embodiments, the optical imaging lens satisfies the conditional expression:
1.1<f/IH<1.2；（5）
f/EPD<2.0；（6）
wherein f represents the focal length of the optical imaging lens, IH represents the corresponding image height of the optical imaging lens in the maximum half field of view, and EPD represents the entrance pupil diameter of the optical imaging lens. The condition expressions (5) and (6) are satisfied, which shows that the optical imaging lens has a larger aperture value and a larger imaging surface, and the lens can have a good imaging effect in a bright and dark environment.
In some embodiments, the optical imaging lens satisfies the conditional expression:
8°/mm<θ21/R21+θ22/R22<12°/mm；（7）
-5°/mm<θ41/R41+θ42/R42<-2°/mm；（8）
10°/mm<θ51/R51+θ52/R52<18°/mm；（9）
0°/mm<θ61/R61+θ62/R62<3°/mm；（10）
where θ 21 denotes an incident angle of the maximum field ray at the maximum aperture of the object-side surface of the second lens, θ 22 denotes an exit angle of the maximum field ray at the maximum aperture of the image-side surface of the second lens, θ 41 denotes an incident angle of the maximum field ray at the maximum aperture of the object-side surface of the fourth lens, θ 42 denotes an exit angle of the maximum field ray at the maximum aperture of the image-side surface of the fourth lens, θ 51 denotes an incident angle of the maximum field ray at the maximum aperture of the object-side surface of the fifth lens, θ 52 denotes an exit angle of the maximum field ray at the maximum aperture of the image-side surface of the fifth lens, θ 61 denotes an incident angle of the maximum field ray at the maximum aperture of the object-side surface of the sixth lens, θ 62 denotes an exit angle of the maximum field ray at the maximum aperture of the image-side surface of the sixth lens, R21 denotes a radius of curvature of the object-side surface of the second lens, R22 denotes a radius of curvature of the image-side surface of the second lens, r41 denotes a radius of curvature of an object-side surface of the fourth lens, R42 denotes a radius of curvature of an image-side surface of the fourth lens, R51 denotes a radius of curvature of an object-side surface of the fifth lens, R52 denotes a radius of curvature of an image-side surface of the fifth lens, R61 denotes a radius of curvature of an object-side surface of the sixth lens, and R62 denotes a radius of curvature of an image-side surface of the sixth lens. The condition formulas (7) to (10) are satisfied, so that the incident angle and the emergent angle of the edge view field on each aspheric lens can be controlled, the influence caused by the eccentric inclination tolerance of the lens in the lens manufacturing and lens assembling processes can be reduced, and the production yield can be improved.
In some embodiments, the optical imaging lens satisfies the conditional expression:
0.2<SAG21/D21+SAG22/D22<0.3；（11）
0<SAG51/D51+SAG52/D52<0.1；（12）
0.1<YR51/D51<0.2；（13）
SAG21 represents the edge rise of the object side surface of the second lens, SAG22 represents the edge rise of the image side surface of the second lens, SAG51 represents the edge rise of the object side surface of the fifth lens, SAG52 represents the edge rise of the image side surface of the fifth lens, D21 represents the clear aperture of the object side surface of the second lens, D22 represents the clear aperture of the image side surface of the second lens, D51 represents the clear aperture of the object side surface of the fifth lens, D52 represents the clear aperture of the image side surface of the fifth lens, and YR51 represents the perpendicular distance between the inflection point on the object side surface of the fifth lens and the optical axis. The requirements of conditional expressions (11) to (13) are met, the aspheric surface shapes of the second lens and the fifth lens are favorably controlled, the chromatic aberration and distortion of the marginal field of view are effectively reduced, and the integral imaging quality is improved.
In some embodiments, the optical imaging lens satisfies the conditional expression:
0.09<CTmax/TTL<0.12；（14）
0<CTmin/TTL<0.05；（15）
wherein, CTmaxRepresenting the maximum center thickness, CT, of a lens in the optical imaging lensminThe minimum central thickness of a lens in the optical imaging lens is represented, and TTL represents the total optical length of the optical imaging lens. The requirements of conditional expressions (14) and (15) are met, the thickness of each lens is uniform, uniform deflection of light rays in an optical system is realized, and the design of a lens barrel and the assembly of lenses are facilitated.
In some embodiments, the optical imaging lens satisfies the conditional expression:
-4.5<f2/f4+f5/f6<-2；（16）
where f2 denotes a focal length of the second lens, f4 denotes a focal length of the fourth lens, f5 denotes a focal length of the fifth lens, and f6 denotes a focal length of the sixth lens. And the conditional expression (16) is satisfied, so that the optical power distribution of the aspheric lens is favorably and reasonably distributed, the field curvature brought under the condition of a large visual field is reduced, and the integral resolving power is improved.
In some embodiments, the optical imaging lens satisfies the conditional expression:
3mm/rad<IH/θ<4mm/rad；（17）
wherein θ represents the maximum half field angle of the optical imaging lens, and IH represents the corresponding image height of the optical imaging lens at the maximum half field angle. And the condition formula (17) is satisfied, so that the optical distortion of the optical imaging lens in the whole field of view can be controlled, and the integral resolving power can be improved.
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.
In the embodiments of the present invention, when the lens in the optical imaging lens is an aspheric lens, the aspheric surface type of the lens satisfies the following equation:
Figure 376411DEST_PATH_IMAGE001
；
wherein z represents the distance between the curved surface and the vertex of the curved surface in the optical axis direction, c is the curvature corresponding to the radius, h is the radial coordinate (the unit of the radial coordinate is the same as the unit of the lens length), and K is the coefficient of the conic section. When K is less than-1, the curve is hyperbolic, parabolic when equal to-1, elliptic when between-1 and 0, circular when equal to 0, and oblate when greater than 0. B. C, D, E, F respectively represent coefficients corresponding to fourth, sixth, eighth, tenth, and twelfth radial coordinates.
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, a filter G1, and a cover glass G2.
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 convex, and the image-side surface S4 of the second lens is concave;
the third lens L3 has positive optical power, and both the object-side surface S5 and the image-side surface S6 of the third lens are convex;
the fourth lens L4 has positive optical power, and both the object-side surface S7 and the image-side surface S8 of the fourth lens are convex;
the fifth lens element L5 has negative power, an object-side surface S9 of the fifth lens element being convex at paraxial region and concave at a distance from the optical axis, and an image-side surface S10 of the fifth lens element being concave;
the sixth lens L6 has positive optical power, and both the object-side surface S11 and the image-side surface S12 of the sixth lens are convex.
The first lens L1 and the third lens L3 are all glass spherical lenses, the second lens L2, the fourth lens L4, the fifth lens L5 and the sixth lens L6 are all plastic aspheric lenses, and the stop ST is located between the third lens L3 and the fourth lens L4.
The parameters related to each lens in the optical imaging lens 100 provided in this embodiment are shown in table 1.
TABLE 1
Figure 730032DEST_PATH_IMAGE002
The surface shape coefficients of the respective aspherical surfaces of the second lens L2, the fourth lens L4, the fifth lens L5, and the sixth lens L6 in the optical imaging lens 100 in the present embodiment are shown in table 2.
TABLE 2
Figure 918437DEST_PATH_IMAGE003
Fig. 2, fig. 3, and fig. 4 show MTF, vertical axis chromatic aberration curve, and monte carlo yield analysis diagrams of the optical imaging lens 100 according to the present embodiment, and as can be seen from fig. 2, MTF values slide down at a constant speed in a frequency range of 0 to 100lp/mm within a maximum field range, and the MTF values are all greater than 0.61, which indicates that the optical imaging lens 100 has a good resolution capability. As can be seen from fig. 3, the vertical axis chromatic aberration of the optical imaging lens 100 is within ± 2.4 microns, which indicates that the optical imaging lens 100 has good chromatic aberration correction capability. As can be seen from fig. 4, at 0.8field (corresponding to a field of view 0.8 times as high as the maximum image), the MTF value is greater than 0.49 when the production yield is 80%, i.e. for 0.8field, if the MTF value is greater than 0.45, the production yield is at least above 80%, indicating that the optical imaging lens 100 has a higher production yield and a higher manufacturability.
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, which is different from the first embodiment in that: the object-side surface S1 of the first lens L1 is concave. Further, the lens surface types have differences in curvature radius, aspherical surface coefficient, thickness, and the like.
The parameters related to each lens in the optical imaging lens 200 provided in this embodiment are shown in table 3.
TABLE 3
Figure 851758DEST_PATH_IMAGE004
The surface shape coefficients of the respective aspherical surfaces of the second lens L2, the fourth lens L4, the fifth lens L5, and the sixth lens L6 in the optical imaging lens 200 in the present embodiment are shown in table 4.
TABLE 4
Figure 51795DEST_PATH_IMAGE005
Fig. 6, fig. 7, and fig. 8 show MTF, vertical axis chromatic aberration curve, and monte carlo yield analysis diagrams of the imaging lens 200 according to the present embodiment, and as can be seen from fig. 6, MTF values slide down at a constant speed in a frequency range of 0 to 100lp/mm within a maximum field range, and the MTF values are all greater than 0.55, which indicates that the optical imaging lens 200 has a good resolution capability. As can be seen from fig. 7, the vertical axis chromatic aberration of the optical imaging lens 200 is within ± 2.4 microns, which indicates that the optical imaging lens 200 has good chromatic aberration correction capability. As can be seen from fig. 8, at 0.8field (corresponding to a field of view 0.8 times as high as the maximum image), the MTF value is greater than 0.45 for 80% of the production yield, i.e. for 0.8field, if the MTF value is greater than 0.45, the production yield is at least above 80%, which indicates that the optical imaging lens 200 has a higher production yield and a higher manufacturability.
Third embodiment
Referring to fig. 9, a schematic structural diagram of an optical imaging lens 300 according to a third embodiment of the present invention is shown, which is different from the first embodiment in that: the object-side surface S5 of the third lens L3 is concave. Further, the lens surface types have differences in curvature radius, aspherical surface coefficient, thickness, and the like.
The parameters related to each lens of the optical imaging lens 300 provided in the present embodiment are shown in table 5.
TABLE 5
Figure 717262DEST_PATH_IMAGE006
The surface shape coefficients of the respective aspherical surfaces of the second lens L2, the fourth lens L4, the fifth lens L5, and the sixth lens L6 in the optical imaging lens 300 in the present embodiment are shown in table 6.
TABLE 6
Figure 2750DEST_PATH_IMAGE007
Fig. 10, fig. 11, and fig. 12 show MTF, vertical axis chromatic aberration curve, and monte carlo yield analysis diagrams of the imaging lens 300 according to the present embodiment, and as can be seen from fig. 10, MTF values slide down at a constant speed in a frequency range of 0 to 100lp/mm within a maximum field range, and are all greater than 0.59, which indicates that the optical imaging lens 300 has a good resolution capability. As can be seen from fig. 11, the vertical axis chromatic aberration of the optical imaging lens 300 is within ± 2.6 microns, which indicates that the optical imaging lens 300 has good chromatic aberration correction capability. As can be seen from fig. 12, at 0.8field (corresponding to a field of view 0.8 times as high as the maximum image), the MTF value is greater than 0.47 for 80% of the production yield, i.e. for 0.8field, if the MTF value is greater than 0.45, the production yield is at least above 80%, which indicates that the optical imaging lens 300 has a higher production yield and a higher manufacturability.
Table 7 shows the optical parameters corresponding to the three embodiments, which mainly include the field angle FOV, the image height IH, the total optical length TTL, the F # and the focal length F of the optical imaging lens, and the values corresponding to each conditional expression in the embodiments.
TABLE 7
Figure 474183DEST_PATH_IMAGE008
In summary, the imaging lens provided in the embodiments of the present invention employs six lenses with specific focal powers, and uses a glass-plastic hybrid lens structure, because the plastic lens employs a production method of injection molding, the degree of freedom of the surface shape is much higher than that of the glass aspheric surface, the special surface shape can be used to replace the adhesive body for eliminating dispersion, and the tolerance of the molding process is much smaller than that of the glass aspheric surface, so that the imaging lens has the advantages of low cost, high yield, and high manufacturability. In addition, the optical imaging lens has the advantages of good chromatic aberration correction, low chromatic dispersion, high resolution and large aperture within the wave band range of 450nm-650nm through specific surface shape collocation and reasonable optical power distribution.
Fourth embodiment
Referring to fig. 13, an imaging device 400 according to a fourth embodiment of the present invention is shown, where the imaging device 400 may include an imaging element 410 and an optical imaging lens (e.g., the optical imaging lens 100) in any of the embodiments described above. The imaging element 410 may be a CMOS (Complementary Metal Oxide Semiconductor) image sensor, and may also be a CCD (Charge Coupled Device) image sensor.
The imaging device 400 may be a vehicle-mounted monitoring device, a security device, an AR/VR device, a smart phone, or any other electronic device equipped with the optical imaging lens.
The imaging apparatus 400 provided by the embodiment includes the optical imaging lens 100, and since the optical imaging lens 100 has the advantages of high resolution, large aperture, low production cost and high yield, the imaging apparatus 400 having the optical imaging lens 100 also has the advantages of high resolution, large aperture, low production cost and high yield.
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 (11)

1. An optical imaging lens, comprising, in order from an object side to an imaging surface along an optical axis:
the lens comprises a first lens with negative focal power, wherein the image side surface of the first lens is a concave surface;
the second lens with negative focal power is characterized in that 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 image side surface of the third lens is a convex 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;
a fifth lens element having a negative optical power, an object-side surface of the fifth lens element being convex at a paraxial region and having an inflection point, an image-side surface of the fifth lens element being concave;
the sixth lens has positive focal power, and both the object-side surface and the image-side surface of the sixth lens are convex surfaces;
the optical imaging lens meets the conditional expression:
0.15<CT34/TTL<0.25；
wherein CT34 represents the air space between the third lens and the fourth lens, and TTL represents the total optical length of the optical imaging lens.
2. The optical imaging lens of claim 1, wherein the first lens and the third lens are glass spherical lenses, and the second lens, the fourth lens, the fifth lens and the sixth lens are plastic aspheric lenses.
3. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the conditional expression:
-0.25<D11/R11<0.25；
wherein R11 denotes a radius of curvature of an object side surface of the first lens, and D11 denotes a clear aperture of the object side surface of the first lens.
4. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the conditional expression:
5<R51/f<12；
5<R51/R52<15；
wherein R51 denotes a radius of curvature of an object side surface of the fifth lens, R52 denotes a radius of curvature of an image side surface of the fifth lens, and f denotes a focal length of the optical imaging lens.
5. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the conditional expression:
1.1<f/IH<1.2；
f/EPD<2.0；
wherein f represents the focal length of the optical imaging lens, IH represents the corresponding image height of the optical imaging lens in the maximum half field of view, and EPD represents the entrance pupil diameter of the optical imaging lens.
6. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the conditional expression:
8°/mm<θ21/R21+θ22/R22<12°/mm；
-5°/mm<θ41/R41+θ42/R42<-2°/mm；
10°/mm<θ51/R51+θ52/R52<18°/mm；
0°/mm<θ61/R61+θ62/R62<3°/mm；
wherein θ 21 represents an incident angle of a maximum field ray at the maximum aperture of the object-side surface of the second lens, θ 22 represents an exit angle of the maximum field ray at the maximum aperture of the image-side surface of the second lens, θ 41 represents an incident angle of the maximum field ray at the maximum aperture of the object-side surface of the fourth lens, θ 42 represents an exit angle of the maximum field ray at the maximum aperture of the image-side surface of the fourth lens, θ 51 represents an incident angle of the maximum field ray at the maximum aperture of the object-side surface of the fifth lens, θ 52 represents an exit angle of the maximum field ray at the maximum aperture of the image-side surface of the fifth lens, θ 61 represents an incident angle of the maximum field ray at the maximum aperture of the object-side surface of the sixth lens, θ 62 represents an exit angle of the maximum field ray at the maximum aperture of the image-side surface of the sixth lens, and R21 represents a radius of curvature of the object-side surface of the second lens, r22 denotes a radius of curvature of an image-side surface of the second lens, R41 denotes a radius of curvature of an object-side surface of the fourth lens, R42 denotes a radius of curvature of an image-side surface of the fourth lens, R51 denotes a radius of curvature of an object-side surface of the fifth lens, R52 denotes a radius of curvature of an image-side surface of the fifth lens, R61 denotes a radius of curvature of an object-side surface of the sixth lens, and R62 denotes a radius of curvature of an image-side surface of the sixth lens.
7. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the conditional expression:
0.2<SAG21/D21+SAG22/D22<0.3；
0<SAG51/D51+SAG52/D52<0.1；
0.1<YR51/D51<0.2；
wherein SAG21 represents an edge rise of an object-side surface of the second lens, SAG22 represents an edge rise of an image-side surface of the second lens, SAG51 represents an edge rise of an object-side surface of the fifth lens, SAG52 represents an edge rise of an image-side surface of the fifth lens, D21 represents a clear aperture of an object-side surface of the second lens, D22 represents a clear aperture of an image-side surface of the second lens, D51 represents a clear aperture of an object-side surface of the fifth lens, D52 represents a clear aperture of an image-side surface of the fifth lens, and YR51 represents a perpendicular distance of an inflection point on the object-side surface of the fifth lens from an optical axis.
8. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the conditional expression:
0.09<CTmax/TTL<0.12；
0<CTmin/TTL<0.05；
wherein, CTmaxRepresenting the maximum center thickness, CT, of a lens in the optical imaging lensminThe minimum central thickness of a lens in the optical imaging lens is represented, and TTL represents the total optical length of the optical imaging lens.
9. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the conditional expression:
-4.5<f2/f4+f5/f6<-2；
wherein f2 denotes a focal length of the second lens, f4 denotes a focal length of the fourth lens, f5 denotes a focal length of the fifth lens, and f6 denotes a focal length of the sixth lens.
10. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the conditional expression:
3mm/rad<IH/θ<4mm/rad；
wherein θ represents the maximum half field angle of the optical imaging lens, and IH represents the corresponding image height of the optical imaging lens at the maximum half field angle.
11. An imaging apparatus comprising the optical imaging lens according to any one of claims 1 to 0 and an imaging element for converting an optical image formed by the optical imaging lens into an electric signal.
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