CN113376813A - Optical lens and imaging apparatus - Google Patents
Optical lens and imaging apparatus Download PDFInfo
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- CN113376813A CN113376813A CN202110934060.0A CN202110934060A CN113376813A CN 113376813 A CN113376813 A CN 113376813A CN 202110934060 A CN202110934060 A CN 202110934060A CN 113376813 A CN113376813 A CN 113376813A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—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 lens and imaging equipment, the optical lens includes from the object side to the imaging surface along the optical axis in turn: a diaphragm; a first lens element having a positive optical power, an object-side surface being convex and an image-side surface being concave at a paraxial region; the image side surface of the second lens is a concave surface; a third lens having positive optical power, an object-side surface of which is convex at a paraxial region; a fourth lens element having a positive optical power, an object-side surface being concave at a paraxial region and an image-side surface being convex at a paraxial region; a fifth lens element having a negative optical power, an object-side surface being convex at a paraxial region and an image-side surface being concave at the paraxial region; a sixth lens element having a negative refractive power, the object-side surface of which is concave; six lenses in the optical lens are aspheric lenses. The optical lens has the advantages of high pixel, large aperture and long focal length.
Description
Technical Field
The present invention relates to the field of imaging lens technology, and in particular, to an optical lens and an imaging device.
Background
At present, along with the popularization of portable electronic devices (such as smart phones and cameras) and the popularity of social, video and live broadcast software, people have higher and higher liking degree for photography, camera lenses have become standard preparations of electronic devices, and camera lenses have even become indexes which are considered primarily when consumers purchase electronic devices.
With the continuous development of mobile information technology, portable electronic devices such as mobile phones are also developing in the directions of being light and thin, full-screen, ultra-high-definition imaging, and the like, which puts higher demands on camera lenses mounted on the portable electronic devices. The common six-piece optical lens has short focal length, poor imaging of a picture at a far position and small aperture value of most lenses, and cannot well meet the imaging requirement of diversification of electronic equipment.
Disclosure of Invention
Therefore, an object of the present invention is to provide an optical lens and an imaging apparatus, which have at least the advantages of high pixel, large aperture and long focal length.
The embodiment of the invention implements the above object by the following technical scheme.
In a first aspect, the present invention provides an optical lens, comprising, in order from an object side to an image plane along an optical axis: a diaphragm; a first lens having a positive optical power, the first lens having a convex object-side surface and a concave image-side surface at a paraxial region; the second lens with negative focal power, the image side surface of the second lens is a concave surface; a third lens having positive optical power, an object side surface of the third lens being convex at a paraxial region; a fourth lens having a positive optical power, an object-side surface of the fourth lens being concave at a paraxial region, an image-side surface of the fourth lens being convex at a paraxial region; a fifth lens having a negative optical power, an object-side surface of the fifth lens being convex at a paraxial region and an image-side surface of the fifth lens being concave at a paraxial region; a sixth lens having a negative optical power, an object side surface of the sixth lens being a concave surface; wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are all aspheric lenses.
In a second aspect, the present invention provides an imaging apparatus, comprising an imaging element and the optical lens provided in the first aspect, wherein the imaging element is configured to convert an optical image formed by the optical lens into an electrical signal.
Compared with the prior art, the optical lens and the imaging equipment provided by the invention adopt six lenses with specific refractive power, and adopt specific surface shape collocation and reasonable focal power distribution, so that the structure is more compact while high pixels are met, and the balance of large aperture, long focal length and high pixels of the lens is better realized.
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 lens according to a first embodiment of the present invention;
FIG. 2 is a field curvature graph of an optical lens according to a first embodiment of the present invention;
FIG. 3 is a distortion curve diagram of an optical lens according to a first embodiment of the present invention;
FIG. 4 is a graph illustrating relative illumination of an optical lens according to a first embodiment of the present invention;
FIG. 5 is a schematic structural diagram of an optical lens system according to a second embodiment of the present invention;
FIG. 6 is a field curvature graph of an optical lens according to a second embodiment of the present invention;
FIG. 7 is a distortion curve diagram of an optical lens according to a second embodiment of the present invention;
FIG. 8 is a graph illustrating relative illumination of an optical lens according to a second embodiment of the present invention;
FIG. 9 is a schematic structural diagram of an optical lens assembly according to a third embodiment of the present invention;
FIG. 10 is a field curvature graph of an optical lens according to a third embodiment of the present invention;
fig. 11 is a distortion graph of an optical lens according to a third embodiment of the present invention;
FIG. 12 is a graph illustrating relative illumination of an optical lens according to a third embodiment of the present invention;
FIG. 13 is a schematic structural diagram of an optical lens assembly according to a fourth embodiment of the present invention;
FIG. 14 is a field curvature graph of an optical lens according to a fourth embodiment of the present invention;
fig. 15 is a distortion graph of an optical lens according to a fourth embodiment of the present invention;
FIG. 16 is a graph illustrating relative illuminance of an optical lens according to a fourth embodiment of the present invention;
fig. 17 is a schematic configuration diagram of an image forming apparatus according to a fifth 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 present invention provides an optical lens, sequentially including, from an object side to an image plane along an optical axis: the lens comprises a diaphragm, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and an optical filter.
The first lens has positive 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 at a paraxial region;
the second lens has negative focal power, the object side surface of the second lens is a convex surface or a concave surface at a paraxial region, and the image side surface of the second lens is a concave surface;
the third lens has positive focal power, the object side surface of the third lens is convex at a paraxial region, and the image side surface of the third lens is concave or convex;
the fourth lens has positive focal power, the object side surface of the fourth lens is concave at a paraxial region, and the image side surface of the fourth lens is convex at the paraxial region;
the fifth lens element has a negative optical power, the fifth lens element has a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;
the sixth lens has negative focal power, and the object side surface of the sixth lens is a concave surface.
The first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens in the optical lens are all aspheric lenses; the aspheric lens can make the imaging performance of the system more excellent.
In some embodiments, the optical lens satisfies the following conditional expression:
1.5mm<(R1*IH)/f<2.8mm；（1）
F#<1.5；（2）
where R1 denotes a radius of curvature of an object side surface of the first lens, IH denotes an actual half image height of the optical lens on an image plane, F denotes an effective focal length of the optical lens, and F # denotes an F-number of the optical lens. The optical lens has the advantages that the conditional expression (1) is satisfied, the effective focal length and the imaging area of the optical lens can be reasonably controlled, the long focal length and the high pixel balance of the optical lens are favorably realized, meanwhile, the conditional expression (2) is satisfied, the large aperture characteristic of the optical lens is favorably realized, and the imaging quality of the lens in a light and dark environment is improved.
In some embodiments, the optical lens satisfies the following conditional expression:
0.6<f4/f<1.3；（3）
2<(f3+f4)/f<3.5；（4）
where f denotes an effective focal length of the optical lens, f3 denotes a focal length of the third lens, and f4 denotes a focal length of the fourth lens. The conditional expressions (3) and (4) are satisfied, the focal lengths of the third lens and the fourth lens can be reasonably distributed, the reduction of high-order aberration is facilitated, and meanwhile, the optical lens can be enabled to have a longer focal length.
In some embodiments, the optical lens satisfies the following conditional expression:
-2<f2/f<-1；（5）
0<(R3+R4)/(R3-R4)<8；（6）
where f denotes an effective focal length of the optical lens, f2 denotes a focal length of the second lens, R3 denotes a radius of curvature of an object-side surface of the second lens, and R4 denotes a radius of curvature of an image-side surface of the second lens. Satisfy above-mentioned conditional expression (5) and (6), can rationally control the face type and the focus of second lens, make the second lens have reasonable negative focal length, be favorable to rectifying the aberration, promote optical lens's resolving power is favorable to reducing the bore and the overall length of follow-up lens simultaneously, realizes optical lens's miniaturization.
In some embodiments, the optical lens satisfies the following conditional expression:
-15<(R5+R6)/(R5-R6)<0；（7）
where R5 denotes a radius of curvature of the object-side surface of the third lens, and R6 denotes a radius of curvature of the image-side surface of the third lens. The condition formula (7) is satisfied, the surface type of the third lens can be reasonably controlled, the light is emitted into the third lens at a smaller angle, the sensitivity is favorably reduced, and the production yield of the optical lens is improved.
In some embodiments, the optical lens satisfies the following conditional expression:
R7<R8<0；（8）
1<R7/R8<9；（9）
-4.5<R7/f4<-0.1；（10）
where R7 denotes a radius of curvature of an object-side surface of the fourth lens, R8 denotes a radius of curvature of an image-side surface of the fourth lens, and f4 denotes a focal length of the fourth lens. The surface type of the fourth lens can be reasonably controlled by satisfying the conditional expressions (8), (9) and (10), which is beneficial to correcting the distortion of the off-axis field of view and improving the resolving power of the optical lens.
In some embodiments, the optical lens satisfies the following conditional expression:
-0.5<R9/f5<0；（11）
-4.0<R10/R11<-0.5；（12）
where R9 denotes a radius of curvature of an object-side surface of the fifth lens, R10 denotes a radius of curvature of an image-side surface of the fifth lens, R11 denotes a radius of curvature of an object-side surface of the sixth lens, and f5 denotes a focal length of the fifth lens. The focal length and the surface type of the fifth lens can be reasonably controlled, the trend of light rays of the off-axis field of view is alleviated, the aberration of the off-axis field of view and the central field of view is favorably reduced, and the resolution quality of the optical lens is improved.
In some embodiments, the optical lens satisfies the following conditional expression:
0.5<f5/f6<10；（13）
-15<(R11+R12)/(R11-R12)<-0.5；（14）
where f5 denotes a focal length of the fifth lens, f6 denotes a focal length of the sixth lens, R11 denotes a radius of curvature of an object-side surface of the sixth lens, and R12 denotes a radius of curvature of an image-side surface of the sixth lens. Satisfying conditional expressions (13) and (14), can rationally distribute the focus of fifth lens and sixth lens, be favorable to rectifying optical lens's distortion, can make the sixth lens satisfy thin lens design simultaneously, be favorable to rectifying the field curvature, improve optical lens's resolution quality.
In some embodiments, the optical lens satisfies the following conditional expression:
4.0<CT1/CT6<7.5；（15）
0.02<CT6/TTL<0.05；（16）
where CT1 denotes the center thickness of the first lens on the optical axis, CT6 denotes the center thickness of the sixth lens on the optical axis, and TTL denotes the total optical length of the optical lens. Satisfying the conditional expressions (15) and (16), the ratio of the central thickness of the first lens to the central thickness of the sixth lens can be made larger, that is, the central thickness of the first lens is thicker, so that the aberration between the off-axis field and the central field can be reduced, and meanwhile, the central thickness of the sixth lens is thinner, so that the curvature of field can be corrected; through the central thickness ratio of the first lens and the sixth lens which are reasonably matched, the aberration of an off-axis field and the aberration of a central field are favorably reduced, and the resolving power is improved.
In some embodiments, the optical lens satisfies the following conditional expression:
0.05<CT45/CT5 <0.2；（17）
2<CT56/CT6 <5；（18）
where CT45 denotes a distance between the fourth lens and the fifth lens on the optical axis, CT56 denotes a distance between the fifth lens and the sixth lens on the optical axis, CT5 denotes a central thickness of the fifth lens on the optical axis, and CT6 denotes a central thickness of the sixth lens on the optical axis. The interval between the fourth lens and the sixth lens can be reasonably controlled by satisfying the conditional expressions (17) and (18), which is beneficial to reducing the sensitivity of the optical lens, and simultaneously, the optical lens has a more compact structure and realizes the miniaturization of the lens.
The invention is further illustrated below in the following examples. In various embodiments, the thickness, the curvature radius, and the material selection of each lens in the optical lens are different, and the specific differences can be referred to in the parameter tables of the various embodiments. 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.
The surface shape of the aspheric lens in each embodiment of the invention satisfies the following equation:
wherein z is the distance rise from the aspheric surface vertex when the aspheric surface is at the position of height h along the optical axis direction, c is the paraxial curvature of the surface, k is conic coefficient, A2iIs the aspheric surface type coefficient of 2i order.
First embodiment
Referring to fig. 1, a schematic structural diagram of an optical lens 100 according to a first embodiment of the present invention is shown, where the optical lens 100 sequentially includes, from an object side to an image plane along an optical axis: the lens system comprises a diaphragm ST, a first lens L1, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5, a sixth lens L6 and a filter G1.
The first lens element L1 has positive power, a convex object-side surface S1, a concave image-side surface S2 at the paraxial region, and a point of inflection perpendicular to the optical axis at a distance of 1.967mm and a sagittal height of 0.057 mm; the position of the inflection point is reasonably controlled, and the optical performance of the optical lens can be effectively improved.
The second lens element L2 has negative power, and has a convex object-side surface S3 and a concave image-side surface S4;
the third lens element L3 has positive optical power, an object-side surface S5 which is convex at the paraxial region, and an image-side surface S6 which is concave at the paraxial region and has a point of inflection which is 1.575mm perpendicular to the optical axis and 0.118mm sagittal height;
the fourth lens element L4 has positive power, its object-side surface S7 being concave at the paraxial region, and its image-side surface S8 being convex at the paraxial region;
the fifth lens element L5 has negative power, its object-side surface S9 is convex at the paraxial region, its image-side surface S10 is concave at the paraxial region, and has a point of inflection that is 1.285mm perpendicular to the optical axis and 0.063mm rise.
The sixth lens element L6 has negative power, and has a concave object-side surface S11 and a convex image-side surface S12.
The second lens element L2, the third lens element L3, the fourth lens element L4, the fifth lens element L5 and the sixth lens element L6 are all plastic aspheric lenses, and the first lens element L1 is a glass aspheric lens.
Specifically, in the present embodiment, the relevant parameters of each lens in the optical lens 100 are shown in table 1.
TABLE 1
The surface shape coefficients of the aspherical surfaces of the optical lens 100 in the present embodiment are shown in table 2.
TABLE 2
In the present embodiment, graphs of field curvature, optical distortion and relative illuminance of the optical lens 100 are shown in fig. 2, 3 and 4, respectively.
The field curvature curve of fig. 2 shows the degree of curvature of the meridional image plane and the sagittal image plane, and it can be seen from the figure that astigmatism of the image planes in both directions is controlled to within ± 0.1mm, which indicates that the astigmatism correction of the optical lens 100 is good.
The optical distortion curve of fig. 3 shows the distortion at different image heights on the image plane, and it can be seen from the figure that the optical distortion is controlled within ± 0.5%, which shows that the distortion of the optical lens 100 is well corrected.
The relative illuminance curve of fig. 4 shows the illuminance values at different viewing angles with respect to the center, and it can be seen from the graph that the relative illuminance at the maximum viewing angle is above 40%, which indicates that the optical lens 100 has a higher relative illuminance.
Second embodiment
Referring to fig. 5, a schematic structural diagram of an optical lens 200 according to a second embodiment of the present invention is provided, the optical lens 200 of the present embodiment is substantially the same as the first embodiment, except that an object-side surface S3 of the second lens element is concave at a paraxial region and has a point of inflection, and curvature radii and material choices of the lens elements are different.
In the embodiment, the vertical distance between the retrocurve of the object side surface S3 of the second lens and the optical axis is 1.160mm, and the rise is-0.012 mm; the vertical distance between the reverse curve of the image side surface S6 of the third lens and the optical axis is 1.919mm, and the rise is 0.439 mm; the vertical distance between the reverse curve of the image side surface S10 of the fifth lens and the optical axis is 1.285mm, and the rise is 0.079 mm; the inflection point is reasonably controlled, and the optical performance of the optical lens can be effectively improved.
Specifically, the parameters related to each lens in the optical lens 200 provided in the present embodiment are shown in table 3.
TABLE 3
The surface shape coefficients of the aspherical surfaces of the optical lens 200 in the present embodiment are shown in table 4.
TABLE 4
In the present embodiment, the astigmatism curve, the optical distortion and the relative illuminance graph of the optical lens 200 are respectively shown in fig. 6, 7 and 8.
Fig. 6 shows an astigmatism curve of the optical lens 200 in this embodiment, and it can be seen that astigmatism of the image plane is controlled within ± 0.2mm in two directions, which indicates that the astigmatism correction of the optical lens 200 is good.
Fig. 7 shows an optical distortion curve of the optical lens 200 of the present embodiment, and it can be seen from the figure that the optical distortion is controlled within ± 0.6%, which shows that the distortion of the optical lens 200 is well corrected.
Fig. 8 shows a relative illuminance curve of the optical lens 200, from which it can be seen that the relative illuminance at the maximum field angle is around 40%, indicating that the optical lens 200 has a higher relative illuminance.
Third embodiment
Referring to fig. 9, a schematic structural diagram of an optical lens 300 according to a third embodiment of the present invention is shown, where the optical lens 300 according to the third embodiment of the present invention has a structure substantially the same as that of the optical lens 100 according to the first embodiment, and the difference is that the curvature radius and the material selection of each lens are different.
In this embodiment, the vertical distance between the inflection point of the object-side surface S1 of the first lens and the optical axis is 2.586mm, and the rise is 0.211 mm; the vertical distance between the reverse curve of the image side surface S6 of the third lens and the optical axis is 1.345mm, and the rise is 0.329 mm; the vertical distance between an inflection point of the image side surface S10 of the fifth lens and the optical axis is 2.385mm, and the rise is 0.534 mm; the inflection point is reasonably controlled, and the optical performance of the optical lens can be effectively improved.
The parameters related to each lens of the optical lens 300 provided in this embodiment are shown in table 5.
TABLE 5
The surface shape coefficients of the aspherical surfaces of the optical lens 300 in the present embodiment are shown in table 6.
TABLE 6
In the present embodiment, graphs of astigmatism curves, optical distortions, and relative illuminance of the optical lens 300 are shown in fig. 10, 11, and 12, respectively.
Fig. 10 shows an astigmatism curve of the optical lens 300 in this embodiment, and it can be seen that astigmatism of the image plane is controlled within ± 0.05mm in two directions, which indicates that the astigmatism correction of the optical lens 300 is good.
Fig. 11 shows an optical distortion curve of the optical lens 300 of the present embodiment, and it can be seen from the figure that the optical distortion is controlled within ± 0.4%, which shows that the distortion of the optical lens 300 is well corrected.
Fig. 12 shows a relative illuminance curve of the optical lens 300, from which it can be seen that the relative illuminance at the maximum field angle is above 40%, indicating that the optical lens 300 has a higher relative illuminance.
Fourth embodiment
Referring to fig. 13, a schematic structural diagram of an optical lens 400 according to a fourth embodiment of the present invention is shown, the optical lens 400 according to the fourth embodiment of the present invention has a structure substantially the same as that of the optical lens 100 according to the first embodiment of the present invention, except that an image-side surface S6 of the third lens element is a convex surface, an image-side surface S12 of the sixth lens element is a concave surface at a paraxial region, the first lens element is a plastic aspheric lens element, and curvature radii and material selections of the lens elements are different.
The parameters related to each lens in the optical lens 400 provided in this embodiment are shown in table 7.
TABLE 7
The surface shape coefficients of the aspherical surfaces of the optical lens 400 in the present embodiment are shown in table 8.
TABLE 8
In the present embodiment, graphs of astigmatism curves, optical distortions, and relative illuminance of the optical lens 400 are shown in fig. 14, 15, and 16, respectively.
Fig. 14 shows an astigmatism curve of the optical lens 400 in this embodiment, and it can be seen that astigmatism of the image plane is controlled within ± 0.2mm in two directions, which indicates that the astigmatism correction of the optical lens 400 is good.
Fig. 15 shows an optical distortion curve of the optical lens 400 of the present embodiment, and it can be seen from the figure that the optical distortion is controlled within 0.7%, which shows that the distortion of the optical lens 400 is well corrected.
Fig. 16 shows a relative illuminance curve of the optical lens 400, from which it can be seen that the relative illuminance at the maximum field angle is above 40%, indicating that the optical lens 400 has a higher relative illuminance.
Table 9 shows the optical characteristics corresponding to the above four embodiments, which mainly include the effective focal length F, F #, total optical length TTL, and viewing angle 2 θ of the system, and the values corresponding to each conditional expression.
TABLE 9
In summary, the optical lens provided by the invention has the following advantages:
(1) the optical lens provided by the invention has the advantages that the diaphragm and the shape of each lens are reasonably arranged, so that on one hand, the optical lens has a larger aperture (F # is about 1.45), and the requirement of a large aperture is met; on the other hand, the focal length of the lens is long (f is about 9.5 mm), and the lens can be matched with a 4800-thousand-pixel CMOS chip for clear imaging, so that imaging requirements of long focal length and high resolution are well balanced.
(2) The six aspheric lens with specific refractive power can be adopted, the glass aspheric lens and the plastic aspheric lens can be mixed and matched, and the lens has ultrahigh pixel imaging quality through the specific surface shape matching.
Fifth embodiment
Referring to fig. 17, an imaging apparatus 500 according to a fifth embodiment of the present invention is shown, where the imaging apparatus 500 may include an imaging element 510 and an optical lens (e.g., the optical lens 100) in any of the embodiments described above. The imaging element 510 may be a CMOS (Complementary Metal Oxide Semiconductor) image sensor, and may also be a CCD (Charge Coupled Device) image sensor.
The imaging device 500 may be a mobile phone, a camera, a tablet computer, or any other electronic device with the optical lens mounted thereon.
The imaging device 500 provided in the embodiment of the present application includes the optical lens 100, and since the optical lens 100 has the advantages of high pixel, large aperture and long focal length, the imaging device 500 having the optical lens 100 also has the advantages of high pixel, large aperture and long focal length.
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 lens, comprising, in order from an object side to an image plane along an optical axis:
a diaphragm;
a first lens having a positive optical power, the first lens having a convex object-side surface and a concave image-side surface at a paraxial region;
the second lens with negative focal power, the image side surface of the second lens is a concave surface;
a third lens having positive optical power, an object side surface of the third lens being convex at a paraxial region;
a fourth lens having a positive optical power, an object-side surface of the fourth lens being concave at a paraxial region, an image-side surface of the fourth lens being convex at a paraxial region;
a fifth lens having a negative optical power, an object-side surface of the fifth lens being convex at a paraxial region and an image-side surface of the fifth lens being concave at a paraxial region;
a sixth lens having a negative optical power, an object side surface of the sixth lens being a concave surface;
wherein the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens are all aspheric lenses.
2. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
1.5mm<(R1*IH)/f<2.8mm；
F#<1.5；
wherein R1 denotes a radius of curvature of an object side surface of the first lens, IH denotes an actual half image height of the optical lens on an image plane, F denotes an effective focal length of the optical lens, and F # denotes an F-number of the optical lens.
3. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
0.6<f4/f<1.3；
2<(f3+f4)/f<3.5；
wherein f denotes an effective focal length of the optical lens, f3 denotes a focal length of the third lens, and f4 denotes a focal length of the fourth lens.
4. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
-2<f2/f<-1；
0<(R3+R4)/(R3-R4)<8；
where f denotes an effective focal length of the optical lens, f2 denotes a focal length of the second lens, R3 denotes a radius of curvature of an object-side surface of the second lens, and R4 denotes a radius of curvature of an image-side surface of the second lens.
5. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
-15<(R5+R6)/(R5-R6)<0；
wherein R5 denotes a radius of curvature of an object-side surface of the third lens, and R6 denotes a radius of curvature of an image-side surface of the third lens.
6. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
R7<R8<0；
1<R7/R8<9；
-4.5<R7/f4<-0.1；
wherein R7 denotes a radius of curvature of an object side surface of the fourth lens, R8 denotes a radius of curvature of an image side surface of the fourth lens, and f4 denotes a focal length of the fourth lens.
7. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
-0.5<R9/f5<0；
-4.0<R10/R11<-0.5；
wherein R9 denotes a radius of curvature of an object side surface of the fifth lens, R10 denotes a radius of curvature of an image side surface of the fifth lens, R11 denotes a radius of curvature of an object side surface of the sixth lens, and f5 denotes a focal length of the fifth lens.
8. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
0.5<f5/f6<10；
-15<(R11+R12)/(R11-R12)<-0.5；
wherein f5 denotes a focal length of the fifth lens, f6 denotes a focal length of the sixth lens, R11 denotes a radius of curvature of an object-side surface of the sixth lens, and R12 denotes a radius of curvature of an image-side surface of the sixth lens.
9. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
4.0<CT1/CT6<7.5；
0.02<CT6/TTL<0.05；
wherein CT1 denotes a central thickness of the first lens on an optical axis, CT6 denotes a central thickness of the sixth lens on an optical axis, and TTL denotes an optical total length of the optical lens.
10. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
0.05<CT45/CT5 <0.2；
2<CT56/CT6 <5；
wherein CT45 denotes a separation distance on an optical axis of the fourth lens and the fifth lens, CT56 denotes a separation distance on an optical axis of the fifth lens and the sixth lens, CT5 denotes a center thickness on an optical axis of the fifth lens, and CT6 denotes a center thickness on an optical axis of the sixth lens.
11. An imaging apparatus comprising the optical lens according to any one of claims 1 to 10 and an imaging element for converting an optical image formed by the optical lens into an electric signal.
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| CN113625433A (en) * | 2021-09-18 | 2021-11-09 | 浙江舜宇光学有限公司 | Optical imaging lens |
| CN114326060A (en) * | 2022-03-07 | 2022-04-12 | 江西联益光学有限公司 | Optical lens |
| CN114637100A (en) * | 2022-05-20 | 2022-06-17 | 江西联益光学有限公司 | Optical lens |
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| CN107632366A (en) * | 2016-07-19 | 2018-01-26 | 大立光电股份有限公司 | Image lens assembly, image capturing device and electronic device |
| CN207037202U (en) * | 2016-08-29 | 2018-02-23 | 株式会社光学逻辑 | Pick-up lens |
| CN108254854A (en) * | 2016-12-29 | 2018-07-06 | 大立光电股份有限公司 | Image capturing system set, image capturing device and electronic device |
| US20200201002A1 (en) * | 2017-11-22 | 2020-06-25 | Zhejiang Sunny Optical Co., Ltd. | Optical imaging lens assembly |
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| CN107632366A (en) * | 2016-07-19 | 2018-01-26 | 大立光电股份有限公司 | Image lens assembly, image capturing device and electronic device |
| CN207037202U (en) * | 2016-08-29 | 2018-02-23 | 株式会社光学逻辑 | Pick-up lens |
| CN108254854A (en) * | 2016-12-29 | 2018-07-06 | 大立光电股份有限公司 | Image capturing system set, image capturing device and electronic device |
| US20200201002A1 (en) * | 2017-11-22 | 2020-06-25 | Zhejiang Sunny Optical Co., Ltd. | Optical imaging lens assembly |
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| CN113625433A (en) * | 2021-09-18 | 2021-11-09 | 浙江舜宇光学有限公司 | Optical imaging lens |
| CN113625433B (en) * | 2021-09-18 | 2023-10-31 | 浙江舜宇光学有限公司 | Optical imaging lens |
| CN114326060A (en) * | 2022-03-07 | 2022-04-12 | 江西联益光学有限公司 | Optical lens |
| CN114637100A (en) * | 2022-05-20 | 2022-06-17 | 江西联益光学有限公司 | Optical lens |
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