CN113625435B - Optical imaging lens and imaging apparatus - Google Patents
Optical imaging lens and imaging apparatus Download PDFInfo
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- CN113625435B CN113625435B CN202111173505.4A CN202111173505A CN113625435B CN 113625435 B CN113625435 B CN 113625435B CN 202111173505 A CN202111173505 A CN 202111173505A CN 113625435 B CN113625435 B CN 113625435B
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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
- 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 positive 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 negative focal power, the image side surface of which is concave; a fourth lens having a positive refractive power, an object-side surface of which is convex; a diaphragm; a fifth lens element having a positive refractive power, the object-side surface and the image-side surface of the fifth lens element being convex; a sixth lens element having a positive refractive power, wherein both the object-side surface and the image-side surface are convex; the object side surface and the image side surface of the seventh lens are both concave surfaces, and the sixth lens and the seventh lens form a cemented lens; and the object side surface of the eighth lens with positive focal power is a convex surface. The optical imaging lens has the advantages of large aperture, low dispersion, high relative illumination, high resolution and high imaging quality.
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 improvement of performance and the reduction of size of common photosensitive elements such as a photosensitive coupling element (CCD) or a Complementary Metal Oxide Semiconductor (CMOS), a higher requirement is put forward for high imaging quality of a matched lens.
In recent years, with the explosion of the automobile industry, automation and in-vehicle monitoring and sensing systems have rapidly developed, and the vehicle-mounted lens has also developed rapidly as a key component of advanced driving assistance systems. The high imaging quality and reliability of the vehicle-mounted lens are more and more considered by automobile manufacturers, and the adaptability and stability of the lens to different environments naturally become a safety guarantee in the driving process of the automobile. The vehicle-mounted lens needs to be used in various environments such as high and low temperature conditions and acid and alkali corrosion conditions, and needs to be used in severe weather conditions such as poor illumination conditions, heavy fog, rain and snow and the like, and in these occasions, the stability of the performance of the lens under the condition of temperature change and the quality of imaging under different illumination conditions need to be considered. For a traditional wide-angle vehicle-mounted lens with high image quality, in order to reduce the aperture of the lens and the manufacturing cost, the aperture is generally small, when a vehicle lighting system cannot work, the exposure time may be insufficient due to the small aperture, so that an image shot by the vehicle-mounted lens cannot be well received by an imaging chip, and the vehicle-mounted lens loses the function; but also the conditions that the relative illumination of the edge field is low in weak illumination, the resolution capability of the edge field is reduced quickly, and the overall imaging quality is poor can occur, so that the normal use of the vehicle-mounted monitoring system is influenced.
Disclosure of Invention
Therefore, the present invention is directed to an optical imaging lens and an imaging apparatus, which have the advantages of large aperture, low dispersion, high relative illumination, high resolution, and high imaging quality.
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, 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 positive 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; a third lens with negative focal power, wherein the image side surface of the third lens is a concave surface; a fourth lens having a positive optical power, an object side surface of the fourth lens being convex; a diaphragm; the lens comprises a fifth lens with positive focal power, wherein both the object-side surface and the image-side surface of the fifth lens are convex surfaces; 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 sixth lens and the seventh lens form a cemented lens; the optical lens comprises an eighth lens with positive focal power, wherein the object side surface of the eighth lens is a convex surface, the image side surface of the eighth lens is a convex surface in a paraxial region, and the far optical axis region is a concave surface; the optical imaging lens meets the conditional expression: 0.2< Dst/TTL < 0.3; wherein Dst represents the aperture of the optical imaging 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 equipment provided by the invention have the advantages that eight glass lenses are matched, and the lens has good thermal stability and higher resolution ratio through reasonable combination of lens materials and focal power; meanwhile, the surface type and the diaphragm of each lens are reasonably arranged, so that the lens has the advantages of large aperture, high relative illumination, low dispersion and the like, the lens has a good imaging effect under the conditions of high frequency and low frequency, and the use requirement of the vehicle-mounted monitoring system can be met.
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 vertical axis chromatic aberration diagram 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 schematic structural diagram of an optical imaging lens according to a second embodiment of the present invention;
FIG. 5 is a vertical axis chromatic aberration diagram of an optical imaging lens according to a second embodiment of the present invention;
FIG. 6 is a diagram of a contrast curve of an optical imaging lens according to a second embodiment of the present invention;
FIG. 7 is a schematic structural diagram of an optical imaging lens system according to a third embodiment of the present invention;
FIG. 8 is a vertical axis chromatic aberration diagram of an optical imaging lens according to a third embodiment of the present invention;
fig. 9 is a contrast chart of an optical imaging lens according to a third embodiment of the present invention;
FIG. 10 is a schematic structural diagram of an optical imaging lens system according to a fourth embodiment of the present invention;
FIG. 11 is a vertical axis chromatic aberration diagram of an optical imaging lens according to a fourth embodiment of the present invention;
fig. 12 is a contrast chart of an optical imaging lens according to a fourth embodiment of the present invention;
FIG. 13 is a schematic structural diagram of an optical imaging lens system according to a fifth embodiment of the present invention;
FIG. 14 is a vertical axis chromatic aberration diagram of an optical imaging lens according to a fifth embodiment of the present invention;
fig. 15 is a contrast chart of an optical imaging lens according to a fifth embodiment of the present invention;
fig. 16 is a schematic structural view of an image forming apparatus according to a sixth embodiment of the present invention;
fig. 17 is a schematic diagram of an angle between a normal line at the maximum light-transmitting aperture on the image side surface of the first lens and the optical axis.
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 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 positive 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 with negative focal power, the object side surface of the third lens can be a concave surface, a convex surface or a plane surface, and the image side surface of the third lens is a concave surface;
the fourth lens with positive focal power, the object side surface of the fourth lens is a convex surface, and the image side surface of the fourth lens can be a concave surface, a convex surface or a plane surface;
a diaphragm;
the lens comprises a fifth lens with positive focal power, wherein both the object-side surface and the image-side surface of the fifth lens are convex surfaces;
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 sixth lens and the seventh lens form a cemented lens;
the optical lens comprises an eighth lens with positive focal power, wherein the object side surface of the eighth lens is a convex surface, the image side surface of the eighth lens is a convex surface in a paraxial region, and the far optical axis region is a concave surface;
the optical imaging lens meets the conditional expression:
0.2<Dst/TTL<0.3；（1）
wherein Dst represents the aperture of the optical imaging lens, and TTL represents the total optical length of the optical imaging lens. The condition formula (1) is satisfied, the front end caliber of the lens is favorably controlled, and the purpose of large aperture is realized.
In some embodiments, the optical imaging lens satisfies the conditional expression:
-0.5<SAG21/D21+SAG22/D22<-0.2；（2）
0.1<SAG81/D81+SAG82/D82<0.5；（3）
1<YR82/SAG82<10；（4）
wherein SAG21 denotes an edge rise of an object-side surface of the second lens, SAG22 denotes an edge rise of an image-side surface of the second lens, SAG81 denotes an edge rise of an object-side surface of the eighth lens, SAG82 denotes an edge rise of an image-side surface of the eighth lens, D21 denotes an optically effective aperture of an object-side surface of the second lens, D22 denotes an optically effective aperture of an image-side surface of the second lens, D81 denotes an optically effective aperture of an object-side surface of the eighth lens, D82 denotes an optically effective aperture of an image-side surface of the eighth lens, and YR82 denotes a perpendicular distance of an inflection point on the image-side surface of the eighth lens from the optical axis. Satisfy above-mentioned conditional expression (2) to (4), through the aspheric surface face type of reasonable control second lens and eighth lens, be favorable to correcting the colour difference and the distortion of marginal visual field, improve the imaging quality of marginal visual field.
In some embodiments, the optical imaging lens satisfies the conditional expression:
8°/mm<θ11/R11+θ12/R12<12°/mm；（5）
where θ 11 denotes an angle between a normal line at the maximum clear aperture on the object-side surface of the first lens and the optical axis, θ 12 denotes an angle between a normal line at the maximum clear aperture on the image-side surface of the first lens and the optical axis, θ 12 can be referred to as a reference in fig. 17, R11 denotes a radius of curvature of the object-side surface of the first lens, and R12 denotes a radius of curvature of the image-side surface of the first lens. And the conditional expression (5) is satisfied, so that the first lens surface type is smooth, the light incidence angle is reduced, the relative illumination of the edge view field is improved, and the influence of the manufacturing tolerance of the lens on the imaging quality is reduced.
In some embodiments, the optical imaging lens satisfies the conditional expression:
-1.6<f1/f2+f3/f4<-0.8；（6）
6<f2/f<25；（7）
-9<f3/f<-4；（8）
5<f4/f<7；（9）
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, and f denotes a focal length of the optical imaging lens. The conditional expressions (6) to (9) are satisfied, and the chromatic aberration among the lenses is compensated by reasonably distributing the focal power of each lens, so that the chromatic aberration of the whole lens can be well corrected, and the integral resolving power of the system is improved.
In some embodiments, the optical imaging lens satisfies the conditional expression:
3.5<D/IH<5.0；（10）
f/ENPD<1.25；（11）
wherein D represents the effective aperture of the optical imaging lens, IH represents the corresponding image height of the optical imaging lens at the maximum half field angle, f represents the focal length of the optical imaging lens, and ENPD represents the entrance pupil diameter of the optical imaging lens. In order to realize the characteristic of a large aperture of the lens, the object side aperture of the first lens and the optical total length of the lens need to be increased, but the lens is larger in volume; satisfying the conditional expressions (10) and (11), a large entrance pupil diameter can be obtained by reasonably controlling the value of D/IH, and the characteristic of a large aperture is realized; the lens has a small size while having a large aperture, and can meet the imaging requirement of high pixels.
In some embodiments, the optical imaging lens satisfies the conditional expression:
-1×10-4mm/℃<f6*(dn/dt)6+f7*(dn/dt)7<-1×10-5mm/℃；（12）
wherein f6 represents the focal length of the sixth lens, f7 represents the focal length of the seventh lens, (dn/dt)6 represents the temperature coefficient of refractive index of the sixth lens at a temperature of 0 to 20 ℃, and (dn/dt)7 represents the temperature coefficient of refractive index of the seventh lens at a temperature of 0 to 20 ℃. The condition formula (12) is met, and the focal length and the refractive index temperature coefficient of the sixth lens and the seventh lens are controlled, so that the thermal focal shift of the optical system in high and low temperature environments is reduced, and the performance stability of the lens at different temperatures is improved.
In some embodiments, the optical imaging lens satisfies the conditional expression:
0.12<CTmax/TTL<0.2；（13）
0.01<CTmin/TTL<0.03；（14）
0.4<CT45/ET45<0.7；（15）
wherein, CTmaxRepresenting the maximum center thickness, CT, of a lens in the optical imaging lensminRepresents a minimum center thickness of a lens in the optical imaging lens, and TTL represents the lightThe total optical length of the optical imaging lens is CT45, the distance between the image side surface of the fourth lens and the object side surface of the fifth lens on the optical axis is ET45, and the air space between the image side surface of the fourth lens and the object side surface of the fifth lens at the effective aperture is represented. The requirements of the conditional expressions (13) to (15) are favorable for controlling the thickness of each lens and the air interval between the lenses, realizing the uniform deflection of light rays in the optical system and being favorable for the design of the lens cone and the assembly of the lens.
In some embodiments, the optical imaging lens satisfies the conditional expression:
3.5mm/rad<IH/HFOV<4mm/rad；（16）
the HFOV represents the maximum half field angle of the optical imaging lens, and the IH represents the corresponding image height of the optical imaging lens at the maximum half field angle, and the unit is radian. And the conditional expression (16) is satisfied, so that the optical distortion of the lens is favorably controlled, the angular resolution of the marginal field is controlled, the resolution of the marginal field is improved, and the imaging deformation degree of the marginal field is reduced.
In some embodiments, the optical imaging lens satisfies the conditional expression:
0.8<R21/R22<1.2；（17）
-0.5<R32/R31<0.5；（18）
-0.3<R41/R42<0.3；（19）
where 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, R31 denotes a radius of curvature of the object-side surface of the third lens, R32 denotes a radius of curvature of the image-side surface of the third lens, R41 denotes a radius of curvature of the object-side surface of the fourth lens, and R42 denotes a radius of curvature of the image-side surface of the fourth lens. Satisfy conditional expression (17) to (19), through the face type of reasonable setting second lens, third lens and fourth lens, the incidence of light can effectively be gentlexed, reduces the correction degree of difficulty of aberration, improves whole imaging quality.
Compared with a spherical lens, the aspheric lens has better spherical aberration correction capability, and in order to improve the imaging quality of the lens and realize the miniaturization of the lens volume, some non-curved lenses are adopted in the optical imaging lens, and specifically, in some embodiments, the first lens, the second lens, the fifth lens and the eighth lens are glass aspheric lenses; the third lens, the fourth lens, the sixth lens and the seventh lens are all glass spherical 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: the lens system includes a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a stop ST, a fifth lens L5, a sixth lens L6, a seventh lens L7, an eighth lens L8, a filter G1, and a protective 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 positive 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 negative power, and both the object-side surface S5 and the image-side surface S6 of the third lens are concave;
the fourth lens L4 has positive focal power, the object-side surface S7 of the fourth lens is convex, and the image-side surface S8 of the fourth lens is concave;
the fifth lens L5 has positive optical power, and both the object-side surface S9 and the image-side surface S10 of the fifth lens are convex;
the sixth lens L6 has positive optical power, and both the object-side surface S11 and the image-side surface of the sixth lens are convex;
the seventh lens L7 has negative focal power, the object-side surface and the image-side surface S13 of the seventh lens are both concave, the sixth lens L6 and the seventh lens L7 form a cemented lens, and the image-side surface of the sixth lens L6 and the object-side surface of the seventh lens L7 form a cemented surface S12;
the eighth lens element L8 has positive power, the object-side surface S14 of the eighth lens element is convex, and the image-side surface S15 of the eighth lens element is convex in the paraxial region and concave in the paraxial region.
The first lens L1, the second lens L2, the fifth lens L5 and the eighth lens L8 are all glass aspheric lenses, and the third lens L3, the fourth lens L4, the sixth lens L6 and the seventh lens L7 are all glass spherical lenses.
The parameters related to each lens in the optical imaging lens 100 provided in this embodiment are shown in table 1.
TABLE 1
The surface shape coefficients of the respective aspherical surfaces of the first lens L1, the second lens L2, the fifth lens L5, and the eighth lens L8 in the optical imaging lens 100 in the present embodiment are shown in table 2.
TABLE 2
Fig. 2 and fig. 3 show the vertical axis chromatic aberration curve and the contrast curve of the optical imaging lens 100 provided in this embodiment, respectively, and as can be seen from fig. 2, the vertical axis chromatic aberration of the optical imaging lens 100 in this embodiment is within ± 3.8 μm, which indicates that the optical imaging lens 100 has good chromatic aberration correction capability. As can be seen from fig. 3, in the maximum field of view range, the imaging relative illuminance RI of the optical imaging lens 100 in this embodiment is greater than 73.80%, which indicates that the optical imaging lens has high imaging relative illuminance and has good imaging performance in the full field of view range.
Second embodiment
Referring to fig. 4, a schematic structural diagram of an optical imaging lens 200 according to an embodiment of the present invention is shown, in which the optical imaging lens 200 in the present embodiment is substantially the same as the optical imaging lens 100 in the first embodiment, except that an object-side surface S5 of a third lens L3 of the optical imaging lens 200 in the present embodiment is a plane (a curvature radius of the plane is infinity), and curvature radii, materials, thicknesses, and the like of the respective lenses are different, and specific relevant parameters of the respective lenses are shown in table 3.
TABLE 3
The parameters of each lens aspheric surface of the optical imaging lens 200 of the present embodiment are shown in table 4.
TABLE 4
Fig. 5 and 6 show vertical axis chromatic aberration curves and relative contrast curves of the optical imaging lens 200 according to the present embodiment. As can be seen from fig. 5, in the present embodiment, the vertical axis chromatic aberration of the optical imaging lens 200 is within ± 4.5 μm, which indicates that the optical imaging lens 200 has good chromatic aberration correction capability. As can be seen from fig. 6, in the maximum field of view range, the imaging relative illuminance RI of the optical imaging lens 200 in this embodiment is greater than 76.10%, which indicates that the optical imaging lens has high imaging relative illuminance and has good imaging in the full field of view range.
Third embodiment
Referring to fig. 7, a schematic structural diagram of an optical imaging lens 300 according to an embodiment of the present invention is shown, in which the optical imaging lens 300 in the present embodiment is substantially the same as the optical imaging lens 100 in the first embodiment, except that an object-side surface S5 of a third lens L3 of the optical imaging lens 300 in the present embodiment is a convex surface, and curvature radii, materials, thicknesses, and the like of the respective lenses are different, and specific parameters of the respective lenses are shown in table 5.
TABLE 5
The parameters of each lens aspheric surface of the optical imaging lens 300 of the present embodiment are shown in table 6.
TABLE 6
Fig. 8 and 9 show vertical axis chromatic aberration curves and relative contrast curves of the optical imaging lens 300 according to the present embodiment, respectively. As can be seen from fig. 8, in the present embodiment, the vertical axis chromatic aberration of the optical imaging lens 300 is within ± 4.0 μm, which indicates that the optical imaging lens 300 has good chromatic aberration correction capability. As can be seen from fig. 9, in the maximum field of view range, the imaging relative illuminance RI of the optical imaging lens 300 in this embodiment is greater than 77.30%, which indicates that the optical imaging lens has high imaging relative illuminance and has good imaging in the full field of view range.
Fourth embodiment
Referring to fig. 10, a schematic structural diagram of an optical imaging lens 400 according to an embodiment of the present invention is shown, in which the optical imaging lens 400 in the present embodiment is substantially the same as the optical imaging lens 100 in the first embodiment, except that an object-side surface S5 of a third lens L3 of the optical imaging lens 400 in the present embodiment is a convex surface, an image-side surface S8 of a fourth lens L4 is a plane, and curvature radii, materials, thicknesses, and the like of the respective lenses are different, and specific relevant parameters of the respective lenses are shown in table 7.
TABLE 7
The parameters of each lens aspheric surface of the optical imaging lens 400 of the present embodiment are shown in table 8.
TABLE 8
Fig. 11 and 12 show vertical axis chromatic aberration graphs and relative contrast graphs of the optical imaging lens 400 according to the present embodiment, respectively, and as can be seen from fig. 11, the optical imaging lens 400 according to the present embodiment has good chromatic aberration correction capability when the vertical axis chromatic aberration is within ± 4.0 μm. As can be seen from fig. 12, in the maximum field of view range, the imaging relative illuminance RI of the optical imaging lens 400 in this embodiment is greater than 77.90%, which indicates that the optical imaging lens has high imaging relative illuminance and has good imaging performance in the full field of view range.
Fifth embodiment
Referring to fig. 13, a schematic structural diagram of an optical imaging lens 500 according to an embodiment of the present invention is shown, where the optical imaging lens 500 in the present embodiment is substantially the same as the optical imaging lens 100 in the first embodiment, except that an object-side surface S5 of a third lens L3 of the optical imaging lens 500 in the present embodiment is a convex surface, an image-side surface S8 of a fourth lens L4 is a convex surface, and curvature radii, materials, thicknesses, and the like of the respective lenses are different, and specific relevant parameters of the respective lenses are shown in table 9.
TABLE 9
The parameters of each lens aspheric surface of the optical imaging lens 500 of the present embodiment are shown in table 10.
Fig. 14 and 15 show vertical axis chromatic aberration graphs and relative contrast graphs of the optical imaging lens 500 according to the present embodiment, respectively, and as can be seen from fig. 14, the optical imaging lens 500 according to the present embodiment has good chromatic aberration correction capability when the vertical axis chromatic aberration is within ± 4.1 μm. As can be seen from fig. 15, in the maximum field of view range, the imaging relative illuminance RI of the optical imaging lens 500 in this embodiment is greater than 77.70%, which indicates that the optical imaging lens has high imaging relative illuminance and has good imaging performance in the full field of view range.
Table 11 shows the optical characteristics corresponding to the five embodiments, which mainly include the total optical length TTL, the focal length f, the maximum field angle FOV, the image height IH of the optical imaging lens, and the numerical values corresponding to each conditional expression in the embodiments.
TABLE 11
In summary, the optical imaging lens provided by the embodiment of the invention adopts eight glass lenses in match, and through reasonable combination of lens materials and focal power, the lens has good thermal stability and higher resolution; simultaneously because the face type and the diaphragm of each lens set up rationally, make the camera lens have the big light ring that is not more than 1.2 and higher relative illuminance, advantages such as low dispersion to make the camera lens all have good imaging under high frequency and low frequency condition, can satisfy on-vehicle monitored control system's user demand.
Sixth embodiment
Referring to fig. 16, an imaging apparatus 600 according to a sixth embodiment of the present invention is shown, where the imaging apparatus 600 may include an imaging element 610 and an optical imaging lens (e.g., the optical imaging lens 100) in any of the embodiments described above. The imaging element 610 may be a CMOS (Complementary Metal Oxide Semiconductor) image sensor, and may also be a CCD (Charge Coupled Device) image sensor.
The imaging device 600 may be a vehicle-mounted monitoring system, a mobile phone, a camera, or any other electronic device equipped with the optical imaging lens.
The imaging device 600 provided by the embodiment of the application comprises the optical imaging lens 100, and as the optical imaging lens 100 has the advantages of large aperture, low dispersion, high relative illumination, high resolution and high imaging quality, the imaging device 600 with the optical imaging lens 100 also has the advantages of large aperture, low dispersion, high relative illumination, high resolution and high imaging quality.
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, characterized in that, eight lenses in total, include from the object side to the image plane along the optical axis in order:
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 positive 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;
a third lens with negative focal power, wherein the image side surface of the third lens is a concave surface;
a fourth lens having a positive optical power, an object side surface of the fourth lens being convex;
a diaphragm;
the lens comprises a fifth lens with positive focal power, wherein both the object-side surface and the image-side surface of the fifth lens are convex surfaces;
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 sixth lens and the seventh lens form a cemented lens;
the optical lens comprises an eighth lens with positive focal power, wherein the object side surface of the eighth lens is a convex surface, the image side surface of the eighth lens is a convex surface in a paraxial region, and the far optical axis region is a concave surface;
the optical imaging lens meets the conditional expression:
0.2<Dst/TTL<0.3；
wherein Dst represents the aperture of the optical imaging lens, and TTL represents the total optical length of the optical imaging lens.
2. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the conditional expression:
-0.5<SAG21/D21+SAG22/D22<-0.2；
0.1<SAG81/D81+SAG82/D82<0.5；
1<YR82/SAG82<10；
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, SAG81 represents an edge rise of an object-side surface of the eighth lens, SAG82 represents an edge rise of an image-side surface of the eighth lens, D21 represents an optically effective aperture of an object-side surface of the second lens, D22 represents an optically effective aperture of an image-side surface of the second lens, D81 represents an optically effective aperture of an object-side surface of the eighth lens, D82 represents an optically effective aperture of an image-side surface of the eighth lens, and YR82 represents a perpendicular distance of an inflection point on the image-side surface of the eighth lens from an optical axis.
3. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the conditional expression:
8°/mm<θ11/R11+θ12/R12<12°/mm；
wherein θ 11 represents an angle between a normal at the maximum clear aperture on the object-side surface of the first lens and the optical axis, θ 12 represents an angle between a normal at the maximum clear aperture on the image-side surface of the first lens and the optical axis, R11 represents a radius of curvature of the object-side surface of the first lens, and R12 represents a radius of curvature of the image-side surface of the first lens.
4. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the conditional expression:
-1.6<f1/f2+f3/f4<-0.8；
6<f2/f<25；
-9<f3/f<-4；
5<f4/f<7；
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, f4 denotes a focal length of the fourth 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:
3.5<D/IH<5.0；
f/ENPD<1.25；
wherein D represents the effective aperture of the optical imaging lens, IH represents the corresponding image height of the optical imaging lens at the maximum half field angle, f represents the focal length of the optical imaging lens, and ENPD 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:
-1×10-4mm/℃<f6*(dn/dt)6+f7*(dn/dt)7<-1×10-5mm/℃；
wherein f6 represents the focal length of the sixth lens, f7 represents the focal length of the seventh lens, (dn/dt)6 represents the temperature coefficient of refractive index of the sixth lens at a temperature of 0 to 20 ℃, and (dn/dt)7 represents the temperature coefficient of refractive index of the seventh lens at a temperature of 0 to 20 ℃.
7. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the conditional expression:
0.12<CTmax/TTL<0.2；
0.01<CTmin/TTL<0.03；
0.4<CT45/ET45<0.7；
wherein, CTmaxRepresenting the maximum center thickness, CT, of a lens in the optical imaging lensminThe optical imaging lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, an ET45 and an optical imaging lens, wherein the first lens is used for imaging the optical imaging lens, the second lens is used for imaging the optical imaging lens, the third lens is used for imaging the optical imaging lens, the TTL is used for imaging the optical total length of the optical imaging lens, the CT45 is used for representing the distance between the image side surface of the fourth lens and the object side surface of the fifth lens on the optical axis, and the ET45 is used for representing the air space between the image side surface of the fourth lens and the object side surface of the fifth lens at the effective aperture.
8. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the conditional expression:
3.5mm/rad<IH/HFOV<4mm/rad；
the HFOV represents a maximum half field angle of the optical imaging lens, and the IH represents a corresponding image height of the optical imaging lens at the maximum half field angle.
9. The optical imaging lens according to claim 1, wherein the optical imaging lens satisfies the conditional expression:
0.8<R21/R22<1.2；
-0.5<R32/R31<0.5；
-0.3<R41/R42<0.3；
wherein R21 denotes a radius of curvature of an object-side surface of the second lens, R22 denotes a radius of curvature of an image-side surface of the second lens, R31 denotes a radius of curvature of an object-side surface of the third lens, R32 denotes a radius of curvature of an image-side surface of the third lens, R41 denotes a radius of curvature of an object-side surface of the fourth lens, and R42 denotes a radius of curvature of an image-side surface of the fourth lens.
10. The optical imaging lens of claim 1, wherein the first lens, the second lens, the fifth lens and the eighth lens are all glass aspheric lenses, and the third lens, the fourth lens, the sixth lens and the seventh lens are all glass spherical lenses.
11. An imaging apparatus comprising the optical imaging lens according to any one of claims 1 to 10 and an imaging element for converting an optical image formed by the optical imaging lens into an electric signal.
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