CN112526729B - Optical lens and imaging apparatus - Google Patents
Optical lens and imaging apparatus Download PDFInfo
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- CN112526729B CN112526729B CN202110179502.5A CN202110179502A CN112526729B CN 112526729 B CN112526729 B CN 112526729B CN 202110179502 A CN202110179502 A CN 202110179502A CN 112526729 B CN112526729 B CN 112526729B
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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
- G02B13/004—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 four lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
- G02B1/041—Lenses
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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: a first lens element having a focal power, an object-side surface of the first lens element being concave or convex at a paraxial region, and an image-side surface of the first lens element being convex; a diaphragm; a second lens element having a positive optical power, the object-side surface of which is concave or convex at the paraxial region and the image-side surface of which is convex; 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 having positive optical power, an object-side surface of which is convex at a paraxial region and has at least one inflection point, and an image-side surface of which is concave at a paraxial region and has at least one inflection point; wherein, the four lenses are plastic aspheric lenses. The optical lens can realize the miniaturization and high-pixel balance of the wide-angle lens, and improves the shooting experience of a user.
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
The optical lens is an important component in an optical imaging system and is one of the standard configurations of terminals such as mobile phones, flat panels, security monitoring equipment, automobile data recorders and the like. In recent years, with the development of mobile information technology, the demand of terminals has increased, and the number of lenses mounted on terminals has also increased.
Along with the enthusiasm of users for the light and thin terminal, in order to pursue a better imaging effect, the optical lens is required to satisfy both miniaturization and wide viewing angle, however, in the prior art, the optical lens in the current market cannot well realize the balance of miniaturization and wide viewing angle, so that the viewing angle is often sacrificed when the miniaturization of the lens is realized, or the defect of large volume is often existed when the wide viewing angle of the lens is realized.
Disclosure of Invention
To this end, an object of the present invention is to provide an optical lens and an imaging apparatus for solving the above problems.
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, a diaphragm, a second lens, a third lens and a fourth lens. The first lens has focal power, and the image side surface of the first lens is a convex surface; the second lens has positive focal power, 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 element has a positive optical power, an object-side surface that is convex at a paraxial region and has at least one inflection point, and an image-side surface that is concave at a paraxial region and has at least one inflection point. The first lens, the second lens, the third lens and the fourth lens are plastic aspheric lenses; the optical lens satisfies the following conditional expression: 0.8< tan (HFOV)/f <1.4, 1.8< TTL/f < 2.0; wherein, HFOV represents the maximum half field angle of the optical lens, TTL represents the total optical length of the optical lens, and f represents 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 have the advantages that the lens shapes and focal powers among the four lenses with specific refractive powers are reasonably matched, the high-pixel requirement is met, the structure is more compact, the miniaturization and high-pixel balance of the wide-angle lens are better realized, and the shooting experience of a user can be effectively improved.
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 optical distortion of an optical lens according to a 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 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 graph showing optical 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 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 graph showing an optical distortion of an optical lens in 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 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. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The present invention provides an optical lens, which includes, in order from an object side to an image plane, a first lens, a diaphragm, a second lens, a third lens, a fourth lens and a filter, where the object side is a side opposite to the image plane.
The first lens has positive focal power or negative focal power, the object side surface of the first lens is a concave surface or a convex surface at a position close to the optical axis, and the image side surface of the first lens is a convex surface.
The second lens has positive focal power, the object side surface of the second lens is concave or convex at a paraxial region, and the image side surface of the second lens is convex.
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 element has a positive optical power, an object-side surface of the fourth lens element being convex at a paraxial region and having at least one inflection point, and an image-side surface of the fourth lens element being concave at the paraxial region and having at least one inflection point.
As an embodiment, the optical lens may further satisfy the following conditional expression:
0.8<tan(HFOV) /f<1.4；（1）
1.8<TTL/f<2.0；（2）
wherein, HFOV denotes a maximum half field angle of the optical lens, TTL denotes an optical total length of the optical lens, and f denotes a focal length of the optical lens.
When the conditional expressions (1) and (2) are satisfied, the total length and the focal length of the optical lens can be reasonably controlled, and the large wide angle and the small size of the optical lens are balanced.
In some optional embodiments, the optical lens may further satisfy the following conditional expression:
0.25<DM1/f<0.35；（3）
0.7<DM1/DM2<0.9；（4）
0.45<DM3/DM4<0.6；（5）
where f denotes a focal length of the optical lens, DM1 denotes an effective half aperture of the first lens, DM2 denotes an effective half aperture of the second lens, DM3 denotes an effective half aperture of the third lens, and DM4 denotes an effective half aperture of the fourth lens.
When the conditional expression (3) is satisfied, the effective caliber of the first lens is reasonably controlled, so that the head size of the optical lens is reduced, and the head miniaturization is realized; when the conditional expressions (4) and (5) are satisfied, the effective calibers of the lenses can be reasonably distributed, the size of the optical lens is favorably reduced, and the miniaturization of the optical lens is realized.
In some optional embodiments, the optical lens may further satisfy the following conditional expression:
-2<f1/f<7；（6）
-0.3<(R1+R2)/(R1-R2)<0.8；（7）
where f denotes a focal length of the optical lens, f1 denotes a focal length of the first lens, 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.
When the conditional expressions (6) and (7) are met, the surface shape of the first lens in front of the diaphragm can be reasonably controlled, the large field angle is met, and meanwhile, the light rays are shrunk, so that the aperture of the subsequent lens and the volume of the whole lens are reduced.
In some optional embodiments, the optical lens may further satisfy the following conditional expression:
-3<f1/f2<9；（8）
-10<f1/f3<2；（9）
where f1 denotes a focal length of the first lens, f2 denotes a focal length of the second lens, and f3 denotes a focal length of the third lens.
When the conditional expressions (8) and (9) are satisfied, the focal lengths of the lenses can be reasonably distributed, the trend of ray turning is slowed down, the correction of high-grade aberration is favorably reduced, and the difficulty in the correction of the aberration of the whole lens is reduced.
In some optional embodiments, the optical lens may further satisfy the following conditional expression:
0.008<(CT12+CT34)/TTL<0.05；（10）
wherein CT12 denotes an air space on the optical axis between the first lens and the second lens, CT34 denotes an air space on the optical axis between the third lens and the fourth lens, and TTL denotes the total optical length of the optical lens.
When the conditional expression (10) is satisfied, the air intervals between the lenses can be reasonably distributed, which is beneficial to reducing the sensitivity of the optical lens and improving the production yield.
In some optional embodiments, the optical lens may further satisfy the following conditional expression:
1.8< CT2/CT3<3.5；（11）
2.0< CT4/CT3<3.5；（12）
where CT2 denotes the center thickness of the second lens, CT3 denotes the center thickness of the third lens, and CT4 denotes the center thickness of the fourth lens.
When the conditional expressions (11) and (12) are satisfied, the central thicknesses of the lenses behind the diaphragm can be reasonably distributed, the compactness of the optical lens structure is favorably realized, and the total length of the optical lens is reduced.
In some optional embodiments, the optical lens may further satisfy the following conditional expression:
2.7<V2/V3 <2.8；（13）
0.9<V2/V4 <1.1；（14）
where V2 denotes the abbe number of the second lens, V3 denotes the abbe number of the third lens, and V4 denotes the abbe number of the fourth lens.
When the conditional expressions (13) and (14) are met, the material selection of the three rear lenses can be reasonably controlled, the resolution power of the optical lens is favorably improved, and meanwhile, the chromatic aberration correction of the optical lens is favorably realized.
In some optional embodiments, the optical lens may further satisfy the following conditional expression:
0.4<R5/R6<0.6；（15）
0.07<CT3/TTL<0.09；（16）
where R5 denotes a radius of curvature of an object-side surface of the third lens, R6 denotes a radius of curvature of an image-side surface of the third lens, CT3 denotes a center thickness of the third lens, and TTL denotes a total optical length of the optical lens.
When the conditional expressions (15) and (16) are met, the surface shape of the third lens is reasonably controlled, so that the difficulty of aberration correction is favorably reduced, the sensitivity of the optical lens is reduced, and the resolution quality of the optical lens is improved; meanwhile, the third lens meets the design of a thin lens, and correction of aberration and improvement of relative illumination are facilitated.
In some optional embodiments, the optical lens may further satisfy the following conditional expression:
0.09mm<SAG7.1<0.14mm；（17）
0.06mm<SAG7.2-SGA7.1<0.12mm；（18）
wherein SAG7.1 represents the edge rise of the object side of the fourth lens, and SAG7.2 represents the rise of the object side of the fourth lens at the inflection point.
When the conditional expressions (17) and (18) are met, the surface shape of the object side surface of the fourth lens can be reasonably controlled, especially, the position of the inflection point is reasonably set, so that the aberration of the off-axis field and the off-axis field is effectively reduced, and the resolution of the edge field is improved.
In some optional embodiments, the optical lens may further satisfy the following conditional expression:
0.8<f/f4<1.5；（19）
-2.5<(R7+R8)/(R7-R8)<-1；（20）
where f denotes a focal length of the optical lens, f4 denotes a focal length 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.
When the conditional expressions (19) and (20) are met, the focal length and the surface type of the fourth lens can be reasonably controlled, so that the reasonable distribution of the light incidence angle is realized, the imaging definition of each view field is ensured, and the imaging quality of the optical lens is improved.
In an embodiment, the first lens, the second lens, the third lens and the fourth lens may be aspheric lenses, and optionally, the lenses are plastic aspheric lenses. By adopting the aspheric lens, the number of the lenses can be effectively reduced, aberration can be corrected, and better optical performance can be provided.
In this embodiment, as an implementation manner, when each lens in the optical lens is an aspheric lens, each aspheric surface shape of the optical lens may satisfy 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 conic coefficient, A2iIs the aspheric surface type coefficient of 2i order.
According to the optical lens provided by the embodiment of the invention, the four lenses with specific refractive power are adopted, and the combination of the lens shapes and the focal powers among the first lens, the second lens, the third lens and the fourth lens is reasonably matched, so that the structure of the optical lens is more compact on the premise of meeting the requirement of high pixel, the miniaturization and high pixel balance of the optical lens are better realized, and the shooting experience of a user can be effectively improved.
The invention is further illustrated below in the following examples. In each of the following embodiments, the thickness and the radius of curvature of each lens in the optical lens are different, and specific differences can be referred to in the parameter tables in the embodiments.
First embodiment
Referring to fig. 1, an optical lens 100 according to a first embodiment of the present invention sequentially includes, from an object side to an image plane: a first lens L1, a stop ST, a second lens L2, a third lens L3, a fourth lens L4, and a filter G1, wherein:
the first lens L1 has negative focal power, the object-side surface S1 of the first lens is concave, and the image-side surface S2 of the first lens is convex;
the second lens L2 has positive optical power, the object-side surface S3 of the second lens is convex at the paraxial region, and the image-side surface S4 of the second lens is convex;
the third lens L3 has 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 convex;
the fourth lens L4 has positive optical power, the fourth lens 'object-side surface S7 is convex at the paraxial region, the fourth lens' image-side surface S8 is concave at the paraxial region, and both the fourth lens 'object-side surface S7 and the fourth lens' image-side surface S8 have at least one inflection point; the vertical distance between the inflection point on the object-side surface S7 of the fourth lens and the optical axis is 0.8365 mm.
Referring to table 1, related parameters of each lens of the optical lens 100 according to the first embodiment of the invention are shown.
TABLE 1
Referring to table 2, the surface coefficients of the aspheric surfaces of the optical lens 100 according to the first embodiment of the present invention are shown.
TABLE 2
Referring to fig. 2, fig. 3 and fig. 4, a field curvature graph, a distortion graph and a vertical axis 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 ± 0.15 mm, which indicates that the field curvature correction of the optical lens 100 is good.
The distortion curve of fig. 3 represents the distortion at different image heights on the imaging plane. In fig. 3, the horizontal axis represents f-tan θ distortion (percentage), and the vertical axis represents the angle of view (unit: degree). As can be seen from fig. 3, the f-tan θ distortion at different image heights on the image plane is controlled within-25% to 5%, indicating that the 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 the longest wavelength and the shortest wavelength. 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 are controlled within ± 1.5 microns, which indicates that the vertical chromatic aberration of the optical lens 100 is well corrected.
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 shown, where the optical lens 200 according to the second embodiment of the present invention has substantially the same structure as the optical lens 100 according to the first embodiment, and the difference is mainly that: the first lens L1 has positive optical power with the object side S1 being convex at the paraxial region; the second lens L2 has positive optical power with its object side S3 being concave at the paraxial region; and the radius of curvature and material selection of each lens are different. In the second embodiment of the present invention, the vertical distance of the inflection point on the object-side surface S7 of the fourth lens from the optical axis is 0.855 mm.
Referring to table 3, parameters related to each lens of the optical lens system 200 according to the second embodiment of the present invention are shown.
TABLE 3
Referring to table 4, the surface coefficients of the aspheric surfaces of the optical lens 200 according to the second embodiment of the present invention are shown.
TABLE 4
Referring to fig. 6, 7 and 8, a field curvature graph, a distortion graph and a vertical axis chromatic aberration graph of the optical lens 200 are respectively shown.
The field curvature curve of fig. 6 indicates 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 200 is good.
The distortion curve of fig. 7 represents the distortion at different image heights on the imaging plane. As can be seen from fig. 7, the f-tan θ distortion at different image heights on the image plane is controlled within-35% to 2.5%, indicating that the distortion of the optical lens 200 is well corrected.
The vertical axis chromatic aberration curve of 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 are controlled within ± 1.2 microns, which indicates that the vertical chromatic aberration of the optical lens 200 is well corrected.
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 substantially the same structure as the optical lens 100 according to the first embodiment, and the difference is mainly that: the first lens L1 has positive optical power with the object side S1 being convex at the paraxial region; the second lens L2 has positive optical power with its object side S3 being concave at the paraxial region; and the radius of curvature and material selection of each lens are different. In the third embodiment of the present invention, the vertical distance of the inflection point on the object-side surface S7 of the fourth lens from the optical axis is 0.836 mm.
Referring to table 5, parameters related to each lens of the optical lens 300 according to the third embodiment of the invention are shown.
TABLE 5
Referring to table 6, the surface coefficients of the aspheric surfaces of the optical lens 300 according to the third embodiment of the present invention are shown.
TABLE 6
Referring to fig. 10, 11 and 12, a field curvature graph, a distortion graph and a vertical axis chromatic aberration graph of the optical lens 300 are respectively shown.
The field curvature curve of fig. 10 indicates 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 300 is good.
The distortion curve of fig. 11 represents the distortion at different image heights on the image plane. As can be seen from fig. 11, the f-tan θ distortion at different image heights on the image plane is controlled within-25% to 5%, indicating that the distortion of the optical lens 300 is well corrected.
The vertical axis chromatic aberration curve of 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 are controlled within ± 1.5 microns, which indicates that the vertical chromatic aberration of the optical lens 300 is well corrected.
Referring to table 7, optical characteristics corresponding to the optical lenses provided in the three embodiments are shown. The optical characteristics mainly include a focal length F, an F # of the optical lens, an entrance pupil diameter EPD, a total optical length TTL, and a field angle FOV of the optical lens, and a correlation value corresponding to each of the aforementioned conditional expressions.
TABLE 7
In summary, the optical lens provided by the invention has the following advantages:
(1) because the shapes of the diaphragm and each lens are reasonably arranged, on one hand, the optical lens has a smaller entrance pupil diameter (EPD <0.70 mm), so that the lens has a smaller head outer diameter and can meet the requirement of high screen ratio; on the other hand, the total length of the optical lens is shorter (TTL is less than 3.1 mm), and the field angle of the optical lens can reach more than 110 degrees, so that the miniaturization and high pixel balance of the wide-angle lens are better realized, and the portable intelligent electronic product can be better satisfied.
(2) Four plastic aspheric lenses with specific refractive power are adopted, and the lenses are matched through specific surface shapes, so that the optical lens has ultrahigh pixel imaging quality.
Fourth embodiment
Referring to fig. 13, a fourth embodiment of the invention provides an imaging apparatus 400, where the imaging apparatus 400 includes an imaging device 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 Pad, or any other portable electronic device with the optical lens mounted thereon.
The imaging device 400 provided by the embodiment of the application comprises the optical lens 100, and the imaging device 400 with the optical lens 100 also has the advantages of small size, large wide angle and high pixel because the optical lens 100 has the advantages of small size, large wide angle and high pixel.
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 (10)
1. An optical lens, comprising, in order from an object side to an image plane along an optical axis:
a first lens having a power, an object side surface of the first lens being concave or convex at a paraxial region, an image side surface of the first lens being convex;
a diaphragm;
a second lens having a positive optical power, an object-side surface of the second lens being convex at a paraxial region, an image-side surface of the second lens being convex;
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, an object side surface of the fourth lens being convex at a paraxial region and having at least one inflection point, an image side surface of the fourth lens being concave at a paraxial region and having at least one inflection point;
the optical lens comprises 4 lenses with focal power, and the first lens, the second lens, the third lens and the fourth lens are plastic aspheric lenses;
the optical lens satisfies the following conditional expression: 0.8< tan (HFOV)/f < 1.4; 1.8< TTL/f < 2.0;
wherein, HFOV represents the maximum half field angle of the optical lens, TTL represents the optical total length of the optical lens, and f represents the focal length of the optical lens;
the optical lens satisfies the conditional expression: 1.8< CT2/CT3< 3.5; 2.0< CT4/CT3< 3.5;
wherein CT2 denotes a center thickness of the second lens, CT3 denotes a center thickness of the third lens, and CT4 denotes a center thickness of the fourth lens.
2. An optical lens according to claim 1, wherein the optical lens satisfies the conditional expression: 0.25< DM1/f < 0.35; 0.7< DM1/DM2< 0.9; 0.45< DM3/DM4< 0.60;
wherein DM1 represents the effective half aperture of the first lens, DM2 represents the effective half aperture of the second lens, DM3 represents the effective half aperture of the third lens, and DM4 represents the effective half aperture of the fourth lens.
3. An optical lens according to claim 1, wherein the optical lens satisfies the conditional expression: -2< f1/f < 7; -0.3< (R1+ R2)/(R1-R2) < 0.8;
where f1 denotes a focal length of the first lens, 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.
4. An optical lens according to claim 1, wherein the optical lens satisfies the conditional expression: -3< f1/f2< 9; -10< f1/f3< 2;
wherein f1 denotes a focal length of the first lens, f2 denotes a focal length of the second lens, and f3 denotes a focal length of the third lens.
5. An optical lens according to claim 1, wherein the optical lens satisfies the conditional expression: 0.008< (CT12+ CT34)/TTL < 0.05;
wherein CT12 denotes an air space on the optical axis between the first lens and the second lens, and CT34 denotes an air space on the optical axis between the third lens and the fourth lens.
6. An optical lens according to claim 1, wherein the optical lens satisfies the conditional expression: 2.7< V2/V3 < 2.8; 0.9< V2/V4 < 1.1;
wherein V2 denotes an abbe number of the second lens, V3 denotes an abbe number of the third lens, and V4 denotes an abbe number of the fourth lens.
7. An optical lens according to claim 1, wherein the optical lens satisfies the conditional expression: 0.4< R5/R6< 0.6; 0.07< CT3/TTL < 0.09;
wherein R5 denotes a radius of curvature of an object side surface of the third lens, R6 denotes a radius of curvature of an image side surface of the third lens, and CT3 denotes a center thickness of the third lens.
8. An optical lens according to claim 1, wherein the optical lens satisfies the conditional expression: 0.09mm < SAG7.1<0.14 mm; 0.06mm < SAG7.2-SGA7.1<0.12 mm;
wherein SAG7.1 represents the edge rise of the object side of the fourth lens, and SAG7.2 represents the rise of the object side of the fourth lens at the point of inflection.
9. An optical lens according to claim 1, wherein the optical lens satisfies the conditional expression: 0.8< f/f4< 1.5; -2.5< (R7+ R8)/(R7-R8) < -1;
where f4 denotes a focal length 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.
10. An imaging apparatus comprising the optical lens according to any one of claims 1 to 9 and an imaging element for converting an optical image formed by the optical lens into an electric signal.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005208236A (en) * | 2004-01-21 | 2005-08-04 | Sony Corp | Single focal lens |
| CN104570278A (en) * | 2013-10-29 | 2015-04-29 | 大立光电股份有限公司 | Image capturing lens assembly, image capturing device and mobile terminal |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005208236A (en) * | 2004-01-21 | 2005-08-04 | Sony Corp | Single focal lens |
| CN104570278A (en) * | 2013-10-29 | 2015-04-29 | 大立光电股份有限公司 | Image capturing lens assembly, image capturing device and mobile terminal |
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