CN113777762B - Optical lens and imaging apparatus - Google Patents
Optical lens and imaging apparatus Download PDFInfo
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- CN113777762B CN113777762B CN202111323421.4A CN202111323421A CN113777762B CN 113777762 B CN113777762 B CN 113777762B CN 202111323421 A CN202111323421 A CN 202111323421A CN 113777762 B CN113777762 B CN 113777762B
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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
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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
- 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
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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 having a positive refractive power, an object-side surface of which is convex; 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; a third lens having a negative optical power, an image-side surface of which is concave at a paraxial region; a fourth lens element having a negative optical power, an object-side surface of the fourth lens element being convex at a paraxial region and an image-side surface of the fourth lens element being concave at a paraxial region, the object-side surface and the image-side surface of the fourth lens element each having at least one inflection point; a fifth lens having positive optical power, an object-side surface of which is convex at a paraxial region; the first lens, the second lens, the third lens, the fourth lens and the fifth lens are all aspheric lenses. The optical lens has the advantages of miniaturization, high pixel 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. Although the common five-lens optical lens has good optical performance, the design requirements of long focal length and high pixel cannot be well met.
Disclosure of Invention
Therefore, an object of the present invention is to provide an optical lens and an imaging apparatus having at least advantages of miniaturization, high pixel, long focal length, and the like.
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, an object side surface of the first lens being convex; 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; a third lens having a negative optical power, an image-side surface of the third lens being concave at a paraxial region; a fourth lens having a negative optical power, an object-side surface of the fourth lens being convex at a paraxial region, an image-side surface of the fourth lens being concave at a paraxial region, and both the object-side surface and the image-side surface of the fourth lens having at least one inflection point; a fifth lens having a positive optical power, an object side surface of the fifth lens being convex at a paraxial region; wherein the first lens, the second lens, the third lens, the fourth lens and the fifth 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 five lenses with specific focal power, and adopt specific surface shape collocation and reasonable focal power distribution, so that the lens has long-focus performance, and the structure is more compact while high pixel is met, thereby better realizing the balance between the long focal length and the high pixel of the lens.
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 an astigmatism graph of an optical lens according to a first embodiment of the present invention;
FIG. 3 is a vertical axis chromatic aberration diagram of an optical lens according to a first embodiment of the present invention;
FIG. 4 is a schematic structural diagram of an optical lens system according to a second embodiment of the present invention;
FIG. 5 is an astigmatism graph of an optical lens according to a second embodiment of the present invention;
FIG. 6 is a vertical axis chromatic aberration diagram of an optical lens according to a second embodiment of the present invention;
FIG. 7 is a schematic structural diagram of an optical lens system according to a third embodiment of the present invention;
FIG. 8 is an astigmatism graph of an optical lens according to a third embodiment of the present invention;
FIG. 9 is a vertical axis chromatic aberration diagram of an optical lens according to a third embodiment of the present invention;
fig. 10 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 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 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 can be a convex surface or 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 a negative optical power, the object side surface of the third lens can be convex or concave, and the image side surface of the third lens is concave at the paraxial region;
a fourth lens element having a negative optical power, an object-side surface of the fourth lens element being convex at a paraxial region, an image-side surface of the fourth lens element being concave at a paraxial region, and both the object-side surface and the image-side surface of the fourth lens element having at least one inflection point;
the fifth lens element has a positive optical power, an object-side surface of the fifth lens element being convex at a paraxial region, and an image-side surface of the fifth lens element being convex or concave at a paraxial region and being convex away from the optical axis.
Wherein the first lens, the second lens, the third lens, the fourth lens and the fifth lens are all aspheric lenses.
In some embodiments, the optical lens satisfies the following conditional expression:
-0.9<f2/f5<-0.5；（1）
0.95<TTL/f<1；（2）
where f2 denotes a focal length of the second lens, f5 denotes a focal length of the fifth lens, TTL denotes an optical total length of the optical lens, and f denotes a focal length of the optical lens. The optical lens meets the conditional expressions (1) and (2), and the balance between the long focal length and the short total length of the optical lens is favorably realized by reasonably controlling the focal power ratio of the second lens and the fifth lens.
In some embodiments, the optical lens satisfies the following conditional expression:
0.5mm<(R1×IH)/f<0.6mm；（3）
5.2mm/rad<IH/θ<5.8mm/rad；（4）
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 a focal length of the optical lens, and θ denotes a half field angle of the optical lens. The optical lens meets the conditional expressions (3) and (4), can reasonably control the focal length and the imaging area of the optical lens, is favorable for realizing the balance of the long focal length and the high pixel of the optical lens, simultaneously ensures that the lens has the characteristic of long focus, ensures that the shooting angle is small, the depth of field is shallow, has obvious compression effect on the scenery shot at a long distance, can virtualize a disordered scene, ensures that people are more prominent, ensures that the picture is more stable, and is particularly suitable for shooting of people such as scenery, tourist photography, portrait of people and the like.
In some embodiments, the optical lens satisfies the following conditional expression:
0.16<CT3/DM3 <0.2；（5）
0.6<DM2/DM3<0.7；（6）
where CT3 denotes the center thickness of the third lens, DM2 denotes the effective aperture of the second lens, and DM3 denotes the effective aperture of the third lens. The optical lens meets the conditional expressions (5) and (6), the effective caliber of the second lens is smaller than that of the third lens and limited in a specific range, and the bending shape of the third lens is limited, so that the turning trend of light rays can be effectively slowed down, the aberration and distortion of an off-axis field can be corrected, and the integral imaging quality of the optical lens is improved.
In some embodiments, the optical lens satisfies the following conditional expression:
-3<R2/f<12；（7）
0.14<CT1/TTL<0.20；（8）
where R2 denotes a radius of curvature of an image-side surface of the first lens, f denotes a focal length of the optical lens, CT1 denotes a center thickness of the first lens, and TTL denotes an optical total length of the optical lens. The curvature radius and the center thickness of the image side surface of the first lens can be reasonably controlled by satisfying the conditional expressions (7) and (8), so that ghost image energy is weakened or ghost images are eliminated, and the imaging performance of the optical lens is improved.
In some embodiments, the optical lens satisfies the following conditional expression:
0.5<R3/f<12；（9）
3<R3/R4<20；（10）
where f denotes a focal length of the optical 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. The surface type of the second lens can be reasonably controlled by satisfying the conditional expressions (9) and (10), the tortuosity of light is reduced, and the optical distortion of the optical lens is favorably corrected.
In some embodiments, the optical lens satisfies the following conditional expression:
0.2<|f4+f5|/f<0.6；（11）
-0.8<f12/f345<0.1；（12）
where f denotes a focal length of the optical lens, f4 denotes a focal length of the fourth lens, f5 denotes a focal length of the fifth lens, f12 denotes a combined focal length of the first lens and the second lens, and f345 denotes a combined focal length of the third lens to the fifth lens. The optical lens meets the conditional expressions (11) and (12), the focal lengths of the first lens to the fifth lens can be reasonably matched, the high-order aberration of the optical lens is favorably corrected, and the resolution quality of the optical lens is improved.
In some embodiments, the optical lens satisfies the following conditional expression:
f3/f<-2；（13）
0<(R5+R6)/(R5-R6)<35；（14）
where f denotes a focal length of the optical lens, f3 denotes a focal length of the third lens, 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. The surface type and the focal length of the third lens can be reasonably controlled by satisfying the conditional expressions (13) and (14), the incident angle of light entering the third lens is reasonably controlled, the sensitivity of the lens is reduced, and the total optical length is favorably shortened.
In some embodiments, the optical lens satisfies the following conditional expression:
-1.5<f4/f<-0.6；（15）
0.05<SAG4.1/DM4<0.15；（16）
1<R7/R8<6；（17）
where f denotes a focal length of the optical lens, f4 denotes a focal length of the fourth lens, SAG4.1 denotes a rise at an inflection point on an object-side surface of the fourth lens, DM4 denotes an effective aperture of the fourth lens, R7 denotes a radius of curvature of the object-side surface of the fourth lens, and R8 denotes a radius of curvature of an image-side surface of the fourth lens. And conditional expressions (15) to (17) are met, and the fourth lens has proper negative focal power by reasonably controlling the surface shape and the caliber of the fourth lens, so that the balance of high pixel and long-focus performance of the optical lens is favorably realized.
In some embodiments, the optical lens satisfies the following conditional expression:
0.2<R9/f5<1；（18）
0.13<CT5/TTL<0.20；（19）
where R9 denotes a radius of curvature of an object side surface of the fifth lens, f5 denotes a focal length of the fifth lens, CT5 denotes a center thickness of the fifth lens, and TTL denotes an optical total length of the optical lens. The surface type and the focal length of the fifth lens can be reasonably controlled by satisfying the conditional expressions (18) and (19), so that the relative illumination of the optical lens is favorably improved, the total length of the optical lens is favorably reduced, and the balance of high-quality imaging and volume miniaturization of the optical lens is realized.
In some embodiments, the optical lens satisfies the following conditional expression:
0.9<CT12/CT2 <1.2；（20）
0.12<CT23/TTL <0.25；（21）
wherein CT2 denotes a center thickness of the second lens, CT12 denotes an air space on an optical axis between an image-side surface of the first lens and an object-side surface of the second lens, CT23 denotes an air space on an optical axis between an image-side surface of the second lens and an object-side surface of the third lens, and TTL denotes a total optical length of the optical lens. The distance between the first lens and the second lens on the optical axis can be reasonably controlled by satisfying the conditional expression (20), so that the sensitivity of the optical lens can be reduced, and the production and processing yield can be improved. Satisfy conditional expression (21), through the air interval between reasonable control second lens and the third lens, can make the structure of camera lens compacter, realize the miniaturization of camera lens.
In some embodiments, the first lens, the second lens, the third lens, the fourth lens, and the fifth lens are all aspheric lenses. Each lens adopts an aspheric lens, so that the number of the lenses can be effectively reduced, aberration can be corrected, and better optical performance can be provided.
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.
In each embodiment of the present invention, the aspherical surface type of each lens satisfies the following equation:
wherein z is the distance rise from the aspheric surface vertex when the aspheric surface is at the position with the height h along the optical axis direction, c is the paraxial curvature of the surface, k is the quadric 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 stop ST, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, and the filter G1.
The first lens element L1 has positive refractive power, the object-side surface S1 of the first lens element is convex, and the image-side surface S2 of the first lens element is convex;
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 a negative power, the object-side surface S5 of the third lens is concave at the paraxial region, and the image-side surface S6 of the third lens is concave at the paraxial region;
the fourth lens L4 has negative optical power, the object-side surface S7 of the fourth lens is convex at the paraxial region, the image-side surface S8 of the fourth lens is concave at the paraxial region, and both the object-side surface S7 and the image-side surface S8 of the fourth lens have an inflection point, the distance of the inflection point of the image-side surface S8 of the fourth lens from the optical axis is 0.957mm, and the rise at the inflection point is 0.139 mm.
The fifth lens element L5 has positive optical power, and its object-side surface S9 is convex at paraxial region and its image-side surface S10 is convex.
The first lens element L1, the second lens element L2, the third lens element L3, the fourth lens element L4 and the fifth lens element L5 are all plastic aspheric lenses, and in other embodiments, each lens element of the optical lens may be a combination of a plastic lens element and a glass lens element.
The parameters related to each lens in the optical lens 100 provided in this embodiment 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, the graphs of the astigmatism curve and the vertical axis chromatic aberration of the optical lens 100 are shown in fig. 2 and 3, respectively.
The astigmatism curve of fig. 2 indicates the degree of curvature of the meridional image plane and the sagittal image plane. In fig. 2, the horizontal axis represents the offset amount (unit: mm) and the vertical axis represents the angle of view (unit: degree). As can be seen from fig. 2, astigmatism of the image plane in the meridional direction and the sagittal direction is controlled to be within ± 0.05mm, which indicates that the astigmatism correction of the optical lens 100 is good.
The vertical axis chromatic aberration curve of fig. 3 shows chromatic aberration at different image heights on the image forming surface for each wavelength with respect to the center wavelength (0.550 μm). In fig. 3, the horizontal axis represents the homeotropic color difference (unit: μm) of each wavelength with respect to the center wavelength, and the vertical axis represents the normalized angle of view. As can be seen from fig. 3, the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ± 1.0 μm, which indicates that the optical lens 100 can effectively correct the aberration of the fringe field and the secondary spectrum of the entire image plane.
Second embodiment
Referring to fig. 4, which is a schematic structural diagram of an optical lens 200 according to the present embodiment, the optical lens 200 according to the second embodiment of the present invention has a structure substantially the same as the optical lens 100 according to the first embodiment, except that: the image-side surface S2 of the first lens element is concave at the paraxial region, the object-side surface S5 of the third lens element is convex at the paraxial region, the distance of the inflection point on the image-side surface S8 of the fourth lens element from the optical axis is 1.134mm, the rise at the inflection point is 0.142mm, the image-side surface S10 of the fifth lens element is concave at the paraxial region, and the radii of curvature, air space, and the like of the respective lens elements are different.
The parameters related to each lens in the optical lens 200 provided in this 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, graphs of the astigmatism curve and the vertical axis chromatic aberration of the optical lens 200 are shown in fig. 5 and 6, respectively.
The astigmatism curve of fig. 5 indicates the degree of curvature of the meridional image plane and the sagittal image plane. It can be seen from fig. 5 that the astigmatism of the image planes in two directions is controlled within ± 0.035mm, which indicates that the astigmatism correction of the optical lens 200 is good.
The vertical axis chromatic aberration curve of fig. 6 shows chromatic aberration at different image heights on the image plane for each wavelength with respect to the center wavelength. As can be seen from fig. 6, the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ± 1.1 μm, which indicates that the optical lens 100 can effectively correct the aberration of the fringe field and the secondary spectrum of the entire image plane.
Third embodiment
Referring to fig. 7, which shows a schematic structural diagram of an optical lens 300 according to the present embodiment, an optical lens 300 according to a third embodiment of the present invention has a structure substantially the same as that of the optical lens 100 according to the first embodiment, except that an image-side surface S2 of the first lens element is a concave surface, an object-side surface S5 of the third lens element is a convex surface, a distance from an inflection point on an image-side surface S8 of the fourth lens element to an optical axis is 1.042mm, a rise on the inflection point is 0.169mm, and curvature radii, air intervals and the like of the respective lenses are different.
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 the astigmatism curve and the vertical axis chromatic aberration of the optical lens 300 are shown in fig. 8 and 9, respectively.
The astigmatism curve of fig. 8 indicates the degree of curvature of the meridional image plane and the sagittal image plane. It can be seen from fig. 8 that astigmatism on the image plane in both directions is controlled within ± 0.02mm, which indicates that the astigmatism correction of the optical lens 300 is good.
The vertical axis chromatic aberration curve of fig. 9 shows chromatic aberration at different image heights on the image forming surface for each wavelength with respect to the center wavelength. As can be seen from fig. 9, the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ± 1.2 μm, which indicates that the optical lens 300 can effectively correct the aberration of the fringe field and the secondary spectrum of the entire image plane.
Table 7 shows the optical characteristics corresponding to the above three embodiments, which mainly include the 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 7
In summary, the optical lens provided by the invention adopts five lenses with specific focal power, and adopts specific surface shape collocation and reasonable focal power distribution, so that the lens has a long-focus performance, meets the requirement of high pixel and has a more compact structure, thereby better realizing the balance between the long focal length and the high pixel of the lens; therefore, the optical lens has a remarkable compression effect on the scene shot at a long distance, can virtualize a disordered scene, makes the figure more prominent and the picture more stable, and is particularly suitable for the photography of figure scenery, tourist photography, figure portrait and the like.
Fourth embodiment
Referring to fig. 10, 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 lens (e.g., the optical 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 mobile phone, a tablet, a camera, or any other electronic device with the optical lens mounted thereon.
The embodiment provides the imaging apparatus 400 including the optical lens 100, and since the optical lens 100 has advantages of miniaturization, high pixel, and long focal length, the imaging apparatus 400 having the optical lens 100 also has advantages of miniaturization, high pixel, 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, an object side surface of the first lens being convex;
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;
a third lens having a negative optical power, an image-side surface of the third lens being concave at a paraxial region;
a fourth lens having a negative optical power, an object-side surface of the fourth lens being convex at a paraxial region, an image-side surface of the fourth lens being concave at a paraxial region, and both the object-side surface and the image-side surface of the fourth lens having at least one inflection point;
a fifth lens having a positive optical power, an object side surface of the fifth lens being convex at a paraxial region;
wherein the first lens, the second lens, the third lens, the fourth lens and the fifth lens are all aspheric lenses;
the optical lens satisfies the following conditional expression:
0.16<CT3/DM3 <0.2；
0.6<DM2/DM3<0.7；
wherein CT3 represents the center thickness of the third lens, DM2 represents the effective aperture of the second lens, and DM3 represents the effective aperture of the third lens.
2. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
-0.9<f2/f5<-0.5；
0.95<TTL/f<1；
wherein f2 denotes a focal length of the second lens, f5 denotes a focal length of the fifth lens, TTL denotes a total optical length of the optical lens, and f denotes a focal length of the optical lens.
3. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
0.5mm<(R1×IH)/ f<0.6mm；
5.2mm/rad<IH/θ<5.8mm/rad；
wherein R1 denotes a radius of curvature of an object-side surface of the first lens element, IH denotes an actual half image height of the optical lens on an image plane, f denotes a focal length of the optical lens, and θ denotes a half field angle of the optical lens.
4. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
-3<R2/f<12；
0.14<CT1/TTL<0.20；
wherein R2 denotes a radius of curvature of an image side surface of the first lens, f denotes a focal length of the optical lens, CT1 denotes a center thickness of the first lens, and TTL denotes an optical total length of the optical lens.
5. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
0.5<R3/f<12；
3<R3/R4<20；
where f denotes a focal length of the optical 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.
6. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
0.2<|f4+f5|/f<0.6；
-0.8<f12/f345<0.1；
wherein f denotes a focal length of the optical lens, f4 denotes a focal length of the fourth lens, f5 denotes a focal length of the fifth lens, f12 denotes a combined focal length of the first lens and the second lens, and f345 denotes a combined focal length of the third lens to the fifth lens.
7. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
f3/f<-2；
0<(R5+R6)/(R5-R6)<35；
where f denotes a focal length of the optical lens, f3 denotes a focal length of the third lens, 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.
8. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
-1.5<f4/f<-0.6；
0.05<SAG4.1/DM4<0.15；
1<R7/R8<6；
wherein f denotes a focal length of the optical lens, f4 denotes a focal length of the fourth lens, SAG4.1 denotes a rise in a sagittal height at an inflection point on an object side surface of the fourth lens, DM4 denotes an effective aperture of the fourth lens, R7 denotes a radius of curvature of an object side surface of the fourth lens, and R8 denotes a radius of curvature of an image side surface of the fourth lens.
9. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
0.2<R9/f5<1；
0.13<CT5/TTL<0.20；
wherein R9 denotes a radius of curvature of an object side surface of the fifth lens, f5 denotes a focal length of the fifth lens, CT5 denotes a center thickness of the fifth lens, and TTL denotes a total optical length of the optical lens.
10. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
0.9<CT12/CT2 <1.2；
0.12<CT23/TTL <0.25；
wherein CT2 represents a center thickness of the second lens, CT12 represents an air space on an optical axis between an image-side surface of the first lens and an object-side surface of the second lens, CT23 represents an air space on an optical axis between an image-side surface of the second lens and an object-side surface of the third lens, and TTL represents an optical total length of the optical 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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