CN112731631A - Optical lens and imaging apparatus - Google Patents
Optical lens and imaging apparatus Download PDFInfo
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- CN112731631A CN112731631A CN202110365365.4A CN202110365365A CN112731631A CN 112731631 A CN112731631 A CN 112731631A CN 202110365365 A CN202110365365 A CN 202110365365A CN 112731631 A CN112731631 A CN 112731631A
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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
- G02B13/06—Panoramic objectives; So-called "sky lenses" including panoramic objectives having reflecting surfaces
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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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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: the first lens with negative focal power has a convex object-side surface and a concave image-side surface; a diaphragm; a second lens with positive 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 convex surface; a third lens with negative focal power, wherein the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a convex surface; a fourth lens element having a positive optical power, an object-side surface being concave, an image-side surface being convex at a paraxial region, and having at least two inflection points; a fifth lens element having a negative optical power, an object-side surface being convex at a paraxial region and having at least one inflection point, and an image-side surface being concave at a paraxial region and having at least one inflection point; the first lens, the second lens, the third lens, the fourth lens and the fifth lens are plastic aspheric lenses. The optical lens can well realize the balance of wide visual angle, miniaturization and high-quality imaging of the lens.
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
With the rapid growth of consumer electronics market and the popularity of social, video and live broadcast software, people have higher and higher requirements for the imaging quality of the camera lens, and the camera lens even becomes an index of primary consideration when consumers purchase electronic equipment.
With the continuous development of mobile information technology, portable electronic devices such as smart phones are also developing in the directions of being light and thin, full-screen, ultra-high-definition imaging and the like, and in order to pursue a better imaging effect, higher requirements are put forward on camera lenses mounted on the portable electronic devices. The wide-angle lens has wide application range, is very useful for shooting a large-range scene at a short distance, and is easy to obtain a picture with strong visual impact, so the wide-angle lens can be widely applied to electronic equipment such as a mobile phone and the like.
However, most wide-angle lenses in the market have large size and poor imaging quality, and it is difficult to satisfy the requirements of light weight, thinness and high definition imaging of portable electronic devices.
Disclosure of Invention
Therefore, the present invention is directed to an optical lens and an imaging device, so as to solve the technical problem that the optical lens in the prior art cannot achieve wide viewing angle, miniaturization and high-quality imaging balance well.
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: 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; a diaphragm; the lens comprises a first lens with positive focal power, a second lens with positive focal power, a third lens and a fourth 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 convex surface; the third lens is provided with negative focal power, the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a convex surface; a fourth lens having a positive optical power, the fourth lens having a concave object-side surface, a convex image-side surface at a paraxial region and having at least two inflection points; a fifth lens having a negative optical power, an object side surface of the fifth lens being convex at a paraxial region and having at least one inflection point, an image side surface of the fifth lens being concave at a paraxial region and having at least one inflection point; the first lens, the second lens, the third lens, the fourth lens and the fifth lens are plastic aspheric lenses; the optical lens satisfies the following conditional expression: -1< R6/f < -0.5, R6 representing the radius of curvature of the image side surface of the third lens, f representing the focal length of the optical lens.
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, adopt specific surface shapes and matching, meet the requirement of wide visual angle, have more compact structure and better imaging quality, and further better realize the balance of wide visual angle, miniaturization and high-quality imaging 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 system 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 graph showing the f-tan θ distortion of the optical lens according to the first embodiment of the present invention;
FIG. 4 is a vertical axis chromatic aberration diagram of an optical lens according to a first embodiment of the present invention;
FIG. 5 is a graph illustrating axial chromatic aberration of an optical lens according to a first 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 graph showing the f-tan θ distortion of an optical lens according to a second embodiment of the present invention;
FIG. 8 is a vertical axis chromatic aberration diagram of an optical lens according to a second embodiment of the present invention;
FIG. 9 is a graph of axial chromatic aberration of an optical lens according to a second 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 graph showing the f-tan θ distortion of an optical lens according to a third embodiment of the present invention;
FIG. 12 is a vertical axis chromatic aberration diagram of an optical lens according to a third embodiment of the present invention;
FIG. 13 is a graph illustrating axial chromatic aberration of an optical lens according to a third embodiment of the present invention;
fig. 14 is a schematic structural view 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, which sequentially includes, from an object side to an image plane along an optical axis: the lens comprises a first lens, a diaphragm, a second lens, a third lens, a fourth lens, a fifth lens and an optical filter.
The first lens has negative focal power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface;
the second lens has positive 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 convex surface;
the third lens has negative focal power, the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a convex surface;
the fourth lens has positive focal power, the object side surface of the fourth lens is a concave surface, the image side surface of the fourth lens is a convex surface at a paraxial region and has at least two points of inflection;
the fifth lens element has a negative optical power, an object-side surface of the fifth lens element being convex at a paraxial region and having at least one inflection point, and an image-side surface of the fifth lens element being concave at the paraxial region and having at least one inflection point.
Meanwhile, the optical lens satisfies the conditional expression: -1< R6/f < -0.5; where R6 denotes a radius of curvature of the image-side surface of the third lens, and f denotes a focal length of the optical lens. The conditional expression is satisfied, the surface shape of the image side surface of the third lens can be reasonably controlled, and spherical aberration and optical distortion can be corrected.
In some embodiments, the optical lens satisfies the following conditional expression:
1.4<R1/DM1<1.5；（1）
where R1 denotes the radius of curvature of the object side surface of the first lens, and DM1 denotes the effective half aperture of the first lens. Satisfy conditional expression (1), can rationally balance wide visual angle and small-size head, realize optical lens's big wide angle and head are miniaturized.
In some embodiments, the optical lens satisfies the following conditional expression:
0.3<SAG1/DM1<0.5；（2）
where SAG1 represents the saggital height of the object-side surface of the first lens at the effective aperture and DM1 represents the effective half aperture of the first lens. And the condition formula (2) is met, the field depth of the optical lens can be reasonably controlled, the windowing area of the optical lens is favorably reduced, and the screen occupation ratio is improved.
In some embodiments, the optical lens satisfies the following conditional expression:
1.2<R1/R2<1.6；（3）
where R1 denotes a radius of curvature of the object-side surface of the first lens, and R2 denotes a radius of curvature of the image-side surface of the first lens. And the conditional expression (3) is satisfied, the surface type of the first lens can be reasonably controlled, the caliber and the volume of the subsequent lens can be reduced, and the miniaturization of the optical lens is realized.
In some embodiments, the optical lens satisfies the following conditional expression:
-5<(R5+R6)/(R5-R6)<-3；（4）
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. When the conditional expression (4) is satisfied, the surface shape of the third lens can be reasonably controlled, optical distortion and aberration can be corrected, and the imaging quality of the optical lens is improved.
In some embodiments, the optical lens satisfies the following conditional expression:
0.045<(SAG6-SAG5)/DM3<0.065；（5）
where SAG5 represents the saggital height of the object-side surface of the third lens at the effective aperture, SAG6 represents the saggital height of the image-side surface of the third lens at the effective aperture, and DM3 represents the effective half aperture of the third lens. When the condition (5) is satisfied, the third lens can satisfy the design of the thin lens, and simultaneously, the trend of ray turning is slowed down as much as possible, the correction difficulty of high-level aberration is reduced, and the imaging quality of the lens is improved.
In some embodiments, the optical lens satisfies the following conditional expression:
0.9<f34/f<1.1；（6）
where f34 denotes a combined focal length of the third lens and the fourth lens, and f denotes a focal length of the optical lens. When the conditional expression (6) is satisfied, the focal lengths of the third lens and the fourth lens can be reasonably controlled, the aberration and the optical distortion can be favorably corrected, and the imaging quality of the optical lens is improved.
In some embodiments, the optical lens satisfies the following conditional expression:
4<R7/R8<8；（7）
where R7 denotes a radius of curvature of the object-side surface of the fourth lens, and R8 denotes a radius of curvature of the image-side surface of the fourth lens. When the conditional expression (7) is satisfied, the shapes of the two sides of the fourth lens can be reasonably controlled, the light condensing intensity of the optical axis is further alleviated, the aberration of the edge field and the central field is reduced, and the resolution capability of the lens in the full field is improved.
In some embodiments, the optical lens satisfies the following conditional expression:
-0.32<(SAG8-SAG7)/DM4<-0.3；（8）
5°<θ7max<10°；（9）
wherein SAG7 represents the saggital height of the object side surface of the fourth lens at the effective aperture, SAG8 represents the saggital height of the image side surface of the fourth lens at the effective aperture, DM4 represents the effective half aperture of the fourth lens, θ 7maxThe maximum face tilt angle of the object side face of the fourth lens is shown. When the conditional expressions (8) and (9) are met, the sensitivity of the optical lens is favorably reduced and the production yield is improved by reasonably controlling the surface type of the fourth lens.
In some embodiments, the optical lens satisfies the following conditional expression:
0.05mm<SAG8.1-SAG8.2<0.07mm；（10）
wherein SAG8.1 denotes a rise of an inflection point of the image side surface of the fourth lens at a position close to the optical axis, and SAG8.2 denotes a rise of an inflection point of the image side surface of the fourth lens at a position away from the optical axis. When the condition formula (10) is satisfied, the position of the inflection point on the image side surface of the fourth lens is reasonably set, so that the light rays emitted out of the image side surface of the fourth lens have a smaller emergent angle, the ghost image energy of the optical lens is favorably reduced, and the imaging quality of the lens is improved.
In some embodiments, the optical lens satisfies the following conditional expression:
0.3mm<SAG10max-SAG10<0.4mm；（11）
wherein SAG10 denotes the rise of the image-side surface of the fifth lens at the effective aperture, SAG10maxRepresenting the maximum rise in the image-side surface of the fifth lens. When the condition formula (11) is met, the surface shape of the image side surface of the fifth lens can be reasonably controlled, the matching degree of the optical lens and the sensor is favorably improved, and the resolution quality of the optical lens is improved.
In some embodiments, the first lens element, the second lens element, the third lens element, the fourth lens element and the fifth lens element are all plastic aspheric lenses.
The invention is further illustrated below in the following examples. In the following embodiments, the thickness, the curvature radius, and the material selection of each lens in the optical lens are different, and specific differences can be referred to in the parameter tables of the embodiments.
The surface shape of the aspheric lens in each embodiment of the invention satisfies the following equation:
wherein z is the 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 coefficient of the quadric surface, 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 comprises a first lens L1, an aperture stop ST, a second lens L2, a third lens L3, a fourth lens L4, a fifth lens L5 and a filter G1.
The first lens L1 has negative focal power, the object-side surface S1 of the first lens is convex, and the image-side surface S2 of the first lens is concave;
the second lens L2 has positive focal power, the object-side surface S3 of the second lens is convex, and the image-side surface S4 of the second lens is convex;
the third lens L3 has negative focal power, the object-side surface S5 of the third lens is concave, and the image-side surface S6 of the third lens is convex;
the fourth lens L4 has positive power, the object-side surface S7 of the fourth lens is concave, the image-side surface S8 of the fourth lens is convex at paraxial region and has two points of inflection; in this embodiment, the positions of the inflection points on the image-side surface S8 of the fourth lens element are respectively that the distance between the inflection point close to the optical axis and the optical axis is 0.399mm, and the distance between the inflection point far away from the optical axis and the optical axis is 0.648 mm;
the fifth lens element L5 has negative power, the object-side surface S9 of the fifth lens element is convex at the paraxial region and has a point of inflection, and the image-side surface S10 of the fifth lens element is concave at the paraxial region and has a point of inflection.
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.
The parameters associated with each lens of the optical lens 100 provided by the first embodiment of the present invention 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
Referring to fig. 2, fig. 3, fig. 4 and fig. 5, a field curvature graph, a f-tan θ distortion graph, a vertical axis chromatic aberration graph and an axial chromatic aberration graph of the optical lens 100 are respectively shown.
The field curvature curve of fig. 2 indicates the degree of curvature of the meridional image plane and the sagittal image plane. In fig. 2, the horizontal axis represents the offset amount (unit: mm) and the vertical axis represents the angle of view (unit: degree). As can be seen from fig. 2, the field curvature of the meridional image plane and the sagittal image plane is controlled within ± 0.2 mm, which indicates that the field curvature correction of the optical lens 100 is good.
The distortion curve of fig. 3 represents the f-tan θ distortion at different image heights on the image plane. In fig. 3, the horizontal axis represents f-tan θ distortion, and the vertical axis represents the angle of view (unit: degree). As can be seen from fig. 3, the optical distortion at different image heights on the image plane is controlled within ± 15%, which indicates that the optical distortion of the optical lens 100 is well corrected.
The vertical axis chromatic aberration curve of fig. 4 shows chromatic aberration at different image heights on the image forming surface for each wavelength with respect to the center wavelength (0.55 um). In fig. 4, 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. 4, the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ± 2 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.
The axial chromatic aberration curve of fig. 5 represents the aberration on the optical axis at the imaging plane. In fig. 5, the horizontal axis represents the axial chromatic difference value (unit: mm), and the vertical axis represents the normalized pupil radius. As can be seen from fig. 5, the offset of the axial chromatic aberration is controlled within ± 0.03 mm, which indicates that the optical lens 100 can effectively correct the axial chromatic aberration.
Second embodiment
The optical lens of this embodiment has substantially the same structure as the optical lens 100 of the first embodiment, except that the curvature radius and material selection of each lens are different, and in this embodiment, the positions of the inflection points on the image side surface S8 of the fourth lens are respectively: the distance between the inflection point close to the optical axis and the optical axis is 0.376mm, and the distance between the inflection point far away from the optical axis and the optical axis is 0.677 mm.
The relevant parameters of each lens in the optical lens provided by the present embodiment are shown in table 3.
TABLE 3
The surface shape coefficients of the aspherical surfaces of the optical lens in this embodiment are shown in table 4.
TABLE 4
Referring to fig. 6, 7, 8 and 9, a field curvature graph, a f-tan θ distortion graph, a vertical axis chromatic aberration graph and an axial chromatic aberration graph of the optical lens in the present embodiment are respectively shown.
Fig. 6 shows the degree of curvature of the meridional image plane and the sagittal image plane. As can be seen from fig. 6, the field curvature of the meridional image plane and the sagittal image plane is controlled within ± 0.1 mm, which indicates that the field curvature correction of the optical lens is good.
Fig. 7 shows f-tan θ distortion at different image heights on the image plane. As can be seen from fig. 7, the f-tan θ distortion at different image heights on the image plane is controlled within ± 15%, indicating that the optical distortion of the optical lens is well corrected.
Fig. 8 shows chromatic aberration at different image heights on the image forming surface for the longest wavelength and the shortest wavelength. As can be seen from fig. 8, the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ± 1.5 microns, which indicates that the optical lens can effectively correct the aberration of the fringe field and the secondary spectrum of the entire image plane.
Fig. 9 shows aberrations on the optical axis at the imaging plane. As can be seen from fig. 9, the offset of the axial chromatic aberration is controlled within ± 0.03 mm, which shows that the optical lens can effectively correct the axial chromatic aberration.
Third embodiment
The optical lens in this embodiment has a structure substantially the same as that of the optical lens 100 in the first embodiment, but the difference is that the curvature radius and material selection of each lens are different; in the present embodiment, the positions of the inflection points on the image-side surface S8 of the fourth lens are respectively: the distance between the point of inflection near the optical axis and the optical axis is 0.395mm, and the distance between the point of inflection far away from the optical axis and the optical axis is 0.667 mm.
The relevant parameters of each lens in the optical lens provided by the present embodiment are shown in table 5.
TABLE 5
The surface shape coefficients of the aspherical surfaces of the optical lens in this embodiment are shown in table 6.
TABLE 6
Referring to fig. 10, fig. 11, fig. 12 and fig. 13, a field curvature graph, a f-tan θ distortion graph, a vertical axis chromatic aberration graph and an axial chromatic aberration graph of the optical lens in the present embodiment are respectively shown.
Fig. 10 shows the degree of curvature of the meridional image plane and the sagittal image plane. As can be seen from fig. 10, the field curvature of the meridional image plane and the sagittal image plane is controlled within ± 0.1 mm, which indicates that the field curvature correction of the optical lens is good.
Fig. 11 shows f-tan θ distortion at different image heights on the image forming plane. As can be seen from fig. 11, the f-tan θ distortion at different image heights on the image plane is controlled within ± 15%, indicating that the optical distortion of the optical lens is well corrected.
Fig. 12 shows chromatic aberration at different image heights on the image forming surface for the longest wavelength and the shortest wavelength. As can be seen from fig. 12, the vertical chromatic aberration of the longest wavelength and the shortest wavelength is controlled within ± 1.5 microns, which indicates that the optical lens can effectively correct the aberration of the fringe field and the secondary spectrum of the entire image plane.
Fig. 13 shows aberrations on the optical axis at the imaging plane. As can be seen from fig. 13, the offset of the axial chromatic aberration is controlled within ± 0.03 mm, which shows that the optical lens can effectively correct the lateral axial chromatic aberration.
Table 7 shows the optical characteristics corresponding to the above three embodiments, which mainly include the effective focal length F, F #, the entrance pupil diameter EPD, the total optical length TTL, the viewing angle 2 θ, and the values corresponding to each conditional expression.
TABLE 7
In summary, the optical lens provided by the invention has the following advantages:
(1) the shapes of the diaphragm and each lens are reasonably arranged, so that the outer diameter of the head of the optical lens can be smaller, and the requirement of high screen ratio is met; on the other hand, the total length of the optical lens is shorter, the size of the optical lens is smaller, and the development trend of light weight and thinness of portable intelligent electronic products such as mobile phones can be better met.
(2) Five plastic aspheric lenses with specific refractive power are adopted, and specific surface type matching is met, so that the distortion and aberration of the lens are effectively corrected, the large field of view is met, the imaging quality is good, and the balance of wide visual angle and high-quality imaging is well realized.
Fourth embodiment
Referring to fig. 14, an imaging device 400 according to a fourth embodiment of the 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 smart phone, a tablet computer, or any other portable electronic device with the optical lens mounted thereon.
The imaging device 400 provided by the embodiment of the application includes the optical lens 100, and since the optical lens 100 has the advantages of small volume, large view field, high resolution capability and the like, the imaging device 400 having the optical lens 100 also has the advantages of small volume, large view field, high resolution capability and the like.
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 (12)
1. An optical lens, comprising, in order from an object side to an image 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;
a diaphragm;
the lens comprises a first lens with positive focal power, a second lens with positive focal power, a third lens and a fourth 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 convex surface;
the third lens is provided with negative focal power, the object side surface of the third lens is a concave surface, and the image side surface of the third lens is a convex surface;
a fourth lens having a positive optical power, the fourth lens having a concave object-side surface, a convex image-side surface at a paraxial region and having at least two inflection points;
a fifth lens having a negative optical power, an object side surface of the fifth lens being convex at a paraxial region and having at least one inflection point, an image side surface of the fifth lens being concave at a paraxial region and having at least one inflection point;
the first lens, the second lens, the third lens, the fourth lens and the fifth lens are plastic aspheric lenses;
the optical lens satisfies the following conditional expression: -1< R6/f < -0.5;
where R6 denotes a radius of curvature of an image side surface of the third lens, and f denotes a focal length of the optical lens.
2. An optical lens according to claim 1, wherein the optical lens satisfies the conditional expression: 1.4< R1/DM1< 1.5;
where R1 represents the radius of curvature of the object-side surface of the first lens and DM1 represents the effective half aperture of the first lens.
3. An optical lens according to claim 1, wherein the optical lens satisfies the conditional expression: 0.3< SAG1/DM1< 0.5;
wherein SAG1 represents the saggital height of the object side of the first lens at the effective aperture and DM1 represents the effective half aperture of the first lens.
4. An optical lens according to claim 1, wherein the optical lens satisfies the conditional expression: 1.2< R1/R2< 1.6;
wherein R1 denotes a radius of curvature of an object side surface of the first lens, and R2 denotes a radius of curvature of an image side surface of the first lens.
5. An optical lens according to claim 1, wherein the optical lens satisfies the conditional expression: -5< (R5+ R6)/(R5-R6) < -3;
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, wherein the optical lens satisfies the conditional expression: 0.045< (SAG6-SAG5)/DM3< 0.065;
wherein SAG5 represents the saggital height of the object side surface of the third lens at the effective aperture, SAG6 represents the saggital height of the image side surface of the third lens at the effective aperture, and DM3 represents the effective half aperture of the third lens.
7. An optical lens according to claim 1, wherein the optical lens satisfies the conditional expression: 0.9< f34/f < 1.1;
where f34 denotes a combined focal length of the third lens and the fourth lens, and f denotes a focal length of the optical lens.
8. An optical lens according to claim 1, wherein the optical lens satisfies the conditional expression: 4< R7/R8< 8;
wherein 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, wherein the optical lens satisfies the conditional expression: -0.32< (SAG8-SAG7)/DM4< -0.3;
5°<θ7max<10°；
wherein SAG7 represents the saggital height of the object side surface of the fourth lens at the effective aperture, SAG8 represents the saggital height of the image side surface of the fourth lens at the effective aperture, DM4 represents the effective half aperture of the fourth lens, θ 7maxRepresents the maximum face tilt angle of the object side face of the fourth lens.
10. An optical lens according to claim 1, wherein the optical lens satisfies the conditional expression: 0.05mm < SAG8.1-SAG8.2<0.07 mm;
wherein SAG8.1 represents the rise of the sagitta point of the image side surface of the fourth lens at a position close to the optical axis, and SAG8.2 represents the rise of the sagitta point of the image side surface of the fourth lens at a position away from the optical axis.
11. An optical lens according to claim 1, wherein the optical lens satisfies the conditional expression: 0.3mm<SAG10max-SAG10<0.4mm；
Wherein SAG10 represents the saggital height of the image side surface of the fifth lens at the effective aperture, SAG10maxRepresents the maximum rise in the image-side surface of the fifth lens.
12. An imaging apparatus comprising the optical lens according to any one of claims 1 to 11 and an imaging element for converting an optical image formed by the optical lens into an electric signal.
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| CN206773277U (en) * | 2017-05-17 | 2017-12-19 | 江西联益光学有限公司 | Micro pick-up lens |
| US20180372995A1 (en) * | 2017-06-21 | 2018-12-27 | Newmax Technology Co., Ltd. | Five-piece optical lens system with a wide field of view |
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| CN103460109A (en) * | 2011-03-25 | 2013-12-18 | 柯尼卡美能达株式会社 | Image pickup optical system, image pickup device, and digital apparatus |
| CN105911673A (en) * | 2015-02-24 | 2016-08-31 | 三星电子株式会社 | Imaging Lens And Imaging Apparatus Including The Same |
| CN107085278A (en) * | 2016-02-16 | 2017-08-22 | 先进光电科技股份有限公司 | Optical imaging system |
| CN206773277U (en) * | 2017-05-17 | 2017-12-19 | 江西联益光学有限公司 | Micro pick-up lens |
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