CN117111272A - Optical lens and imaging apparatus - Google Patents
Optical lens and imaging apparatus Download PDFInfo
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- CN117111272A CN117111272A CN202311362726.5A CN202311362726A CN117111272A CN 117111272 A CN117111272 A CN 117111272A CN 202311362726 A CN202311362726 A CN 202311362726A CN 117111272 A CN117111272 A CN 117111272A
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- 230000003287 optical effect Effects 0.000 title claims abstract description 165
- 238000003384 imaging method Methods 0.000 title claims abstract description 33
- 230000014509 gene expression Effects 0.000 claims description 40
- 210000001747 pupil Anatomy 0.000 claims description 3
- 230000004075 alteration Effects 0.000 description 24
- 238000010586 diagram Methods 0.000 description 7
- 230000008901 benefit Effects 0.000 description 5
- 239000000463 material Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 4
- 239000000047 product Substances 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
- 239000011521 glass Substances 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 230000002349 favourable effect Effects 0.000 description 2
- 230000035945 sensitivity Effects 0.000 description 2
- 230000000007 visual effect Effects 0.000 description 2
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- 201000009310 astigmatism Diseases 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012634 optical imaging Methods 0.000 description 1
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Classifications
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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
- 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
-
- 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
-
- 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 application discloses an optical lens and imaging equipment, the lens includes from object side to imaging surface along optical axis: a diaphragm; the first lens with positive focal power has a convex object side surface and a concave image side surface; a second lens having positive optical power, the object-side surface of which is convex at a paraxial region; a third lens having negative optical power, the image-side surface of which is concave; a fourth lens having negative optical power, an image-side surface of which is concave at a paraxial region; a fifth lens element with positive refractive power having a convex image-side surface; a sixth lens element with negative refractive power having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region; the seventh lens element with negative refractive power has a concave object-side surface at a paraxial region and a concave image-side surface at a paraxial region. The application reasonably restricts the surface type and focal power of each lens to ensure that the lens meets the balance of large aperture, small total length and long focal length.
Description
Technical Field
The present application relates to the field of imaging lenses, and in particular, to an optical lens and an imaging device.
Background
The optical lens is also called an imaging lens or a photographic lens, and is called optical imaging for short. According to data display, the smart phone, the tablet personal computer and the functional mobile phone respectively occupy 74.6%, 8.6% and 7.4% of the sales volume of each application field of the global optical lens, wherein the application field of the smart phone occupies the highest proportion, and the main reason is that smart phone manufacturers continuously perform technical innovation, so that a double-camera product gradually permeates in the smart phone lens industry, a multi-camera product gradually enters the market, and the innovation capability of the mobile phone optical lens product is enhanced. Therefore, the optical lens is continuously released from the requirements of the application field of the mobile phone.
According to the characteristic principle of the optical lens, the optical lens can be divided into three types of plastic lenses, glass lenses and glass-plastic mixed lenses, wherein the glass lenses are formed by assembling glass lenses, and the plastic lenses are formed by assembling plastic lenses, so that the two types of optical lenses have great differences in material properties, processing technology, light transmittance and the like, and the final application range is also greatly different. In general, plastic lenses have the characteristics of strong plasticity, easy manufacture into an aspheric shape, convenient miniaturization and the like, and are widely applied to mobile phones, digital cameras and other devices. How to design a plastic lens with compact structure, large aperture, small total length and long focal length is a current urgent problem to be solved.
Disclosure of Invention
Therefore, an object of the present application is to provide an optical lens and an imaging apparatus having at least the advantages of a large aperture, a small total length, and a long focal length.
The embodiment of the application realizes the aim through the following technical scheme.
In a first aspect, the present application provides an optical lens comprising, in order from an object side to an imaging plane along an optical axis:
a diaphragm;
a first lens with positive focal power, 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 second lens having positive optical power, an object side surface of the second lens being convex at a paraxial region;
a third lens having negative optical power, an image side surface of the third lens being a concave surface;
a fourth lens having negative optical power, an image-side surface of the fourth lens being concave at a paraxial region;
a fifth lens having positive optical power, an image side surface of the fifth lens being a convex surface;
a sixth lens element with negative refractive power having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;
a seventh lens having negative optical power, an object-side surface of the seventh lens being concave at a paraxial region, an image-side surface of the seventh lens being concave at a paraxial region;
the optical lens satisfies the following conditional expression:
-2.5<f6/f<-1.8；
wherein f represents an effective focal length of the optical lens, and f6 represents an effective focal length of the sixth lens.
In a second aspect, the present application provides an imaging apparatus including an imaging element for converting an optical image formed by the optical lens into an electrical signal, and the optical lens provided in the first aspect.
Compared with the prior art, the optical lens and the imaging device provided by the application adopt 7 plastic lenses, the optical lens has the characteristics of small total length and long focal length through specific surface shape collocation and reasonable focal power distribution, and meanwhile, the chromatic aberration of the system can be effectively corrected through reasonably selecting the materials of the lenses.
Drawings
The foregoing and/or additional aspects and advantages of the application will become apparent and may be better understood from the following description of embodiments taken in conjunction with the accompanying drawings in which:
fig. 1 is a schematic structural diagram of an optical lens according to a first embodiment of the present application;
FIG. 2 is a graph showing F-Tan (θ) distortion of an optical lens according to a first embodiment of the present application;
FIG. 3 is a graph showing a field curvature of an optical lens according to a first embodiment of the present application;
FIG. 4 is a graph showing a vertical axis chromatic aberration curve of an optical lens according to a first embodiment of the present application;
FIG. 5 is a schematic diagram of an optical lens according to a second embodiment of the present application;
FIG. 6 is a graph of F-Tan (θ) distortion of an optical lens according to a second embodiment of the present application;
FIG. 7 is a graph showing a field curvature of an optical lens according to a second embodiment of the present application;
FIG. 8 is a graph showing a vertical axis chromatic aberration curve of an optical lens according to a second embodiment of the present application;
FIG. 9 is a schematic diagram of an optical lens according to a third embodiment of the present application;
FIG. 10 is a graph showing F-Tan (θ) distortion of an optical lens according to a third embodiment of the present application;
FIG. 11 is a graph showing a field curvature of an optical lens according to a third embodiment of the present application;
fig. 12 is a vertical axis chromatic aberration diagram of an optical lens according to a third embodiment of the present application.
Detailed Description
For a better understanding of the application, various aspects of the application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed description are merely illustrative of embodiments of the application and are not intended to limit the scope of the application in any way. Like reference numerals refer to like elements throughout the specification. The expression "and/or" includes any and all combinations of one or more of the associated listed items.
It should be noted that in the present specification, the expressions of first, second, third, etc. are only used to distinguish one feature from another feature, and do not represent any limitation on the feature. Accordingly, a first lens discussed below may also be referred to as a second lens or a third lens without departing from the teachings of the present application.
In the drawings, the thickness, size, and shape of the lenses have been slightly exaggerated for convenience of explanation. In particular, the spherical or aspherical shape shown in the drawings is shown by way of example. That is, the shape of the spherical or aspherical surface is not limited to the shape of the spherical or aspherical surface shown in the drawings. The figures are merely examples and are not drawn to scale.
Herein, the paraxial region refers to a region near the optical axis. If the lens surface is convex and the convex position is not defined, then the lens surface is convex at least in the paraxial region; if the lens surface is concave and the concave position is not defined, it means that the lens surface is concave at least in the paraxial region. The surface of each lens closest to the object is referred to as the object side of the lens, and the surface of each lens closest to the imaging plane is referred to as the image side of the lens.
It will be further understood that the terms "comprises," "comprising," "includes," "including," "having," "containing," and/or "including," when used in this specification, specify the presence of stated features, elements, and/or components, but do not preclude the presence or addition of one or more other features, elements, components, and/or groups thereof. Furthermore, when a statement such as "at least one of the following" appears after a list of features that are listed, the entire listed feature is modified instead of modifying a separate element in the list. Furthermore, when describing embodiments of the application, use of "may" means "one or more embodiments of the application. Also, the term "exemplary" is intended to refer to an example or illustration.
Unless otherwise defined, all terms (including technical and scientific terms) used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.
It should be noted that, without conflict, the embodiments of the present application and features of the embodiments may be combined with each other. The application will be described in detail below with reference to the drawings in connection with embodiments.
The application provides an optical lens, which comprises seven lenses in total, and sequentially comprises from an object side to an imaging surface along an optical axis: diaphragm, first lens, second lens, third lens, fourth lens, fifth lens, sixth lens, seventh lens and light filter.
The lens comprises a first lens with positive focal power, 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 second lens having positive optical power, an object side surface of the second lens being convex at a paraxial region;
a third lens having negative optical power, an image side surface of the third lens being a concave surface;
a fourth lens having negative optical power, an image-side surface of the fourth lens being concave at a paraxial region;
a fifth lens having positive optical power, an image side surface of the fifth lens being a convex surface;
a sixth lens element with negative refractive power having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;
a seventh lens having negative optical power, an object-side surface of the seventh lens being concave at a paraxial region, an image-side surface of the seventh lens being concave at a paraxial region;
in the above lens, the first lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are all plastic aspherical lenses. The application reasonably restricts the surface type and focal power of each lens to ensure that the lens meets the balance of large aperture, small total length and long focal length.
In some embodiments, the optical lens satisfies the following conditional expression:
1.75<f/EPD<1.8；（1）
where f represents the effective focal length of the optical lens and EPD represents the entrance pupil diameter of the optical lens. When the condition (1) is satisfied, the ratio of the effective focal length to the entrance pupil diameter of the optical lens is reasonably controlled, so that the optical lens has the characteristic of a large aperture, and particularly when the optical lens images in a dark environment, the noise influence caused by too weak light can be reduced, thereby improving the imaging quality, and enabling the optical lens to satisfy the imaging requirements under different luminous fluxes.
In some embodiments, the optical lens satisfies the following conditional expression:
0.6<IH/TTL <0.8；（2）
wherein IH represents half image height of the optical lens, and TTL represents total optical length of the optical lens. When the condition formula (2) is satisfied, the ratio of the half image height to the total optical length of the optical lens is reasonably controlled, so that the optical lens has the characteristic of a large target surface, the resolution and the imaging quality of the lens are improved, meanwhile, the advantage of short total length is achieved, and the total height of the module can be reduced.
In some embodiments, the optical lens satisfies the following conditional expression:
3<(f1+f2)/f <5；（3）
wherein f1 represents an effective focal length of the first lens, f2 represents an effective focal length of the second lens, and f represents an effective focal length of the optical lens. The condition (3) is satisfied, and through reasonably configuring the focal power of each lens, the coma correction of the off-axis visual field is enhanced, meanwhile, the curvature and the aberration of the field are well converged, and the imaging quality of the dark environment is improved.
In some embodiments, the optical lens satisfies the following conditional expression:
-15<(f3+f4)/f <-4；（4）
wherein f3 represents an effective focal length of the third lens, f4 represents an effective focal length of the fourth lens, and f represents an effective focal length of the optical lens. The condition (4) is satisfied, and the focal power of the third lens and the fourth lens is reasonably configured, so that the negative spherical aberration and the axial chromatic aberration generated by the first lens and the second lens can be effectively balanced, and the lens has higher resolving power.
In some embodiments, the optical lens satisfies the following conditional expression:
0<CT7/DM7 <0.15；（5）
0.8<DM6/DM7<1；（6）
wherein CT7 represents the center thickness of the seventh lens, DM6 represents the effective aperture of the sixth lens, and DM7 represents the effective aperture of the seventh lens. The above conditional expressions (5) and (6) are satisfied, and the bending shape of the seventh lens is controlled by reasonably controlling the ratio of the effective caliber of the sixth lens to the effective caliber of the seventh lens and controlling the ratio of the center thickness of the seventh lens to the effective caliber of the seventh lens, so that the turning trend of light can be effectively slowed down, the aberration and distortion of the off-axis visual field can be effectively corrected, and the high-quality imaging of the lens can be ensured.
In some embodiments, the optical lens satisfies the following conditional expression:
-2<SAG61/SAG62<10；（7）
wherein SAG61 represents the sagittal height at the object-side effective aperture of the sixth lens, and SAG62 represents the sagittal height at the image-side effective aperture of the sixth lens. When the conditional expression (7) is satisfied, the degree of bending of the sixth lens can be reasonably controlled, and the molding difficulty of the sixth lens can be reduced, thereby reducing the processing sensitivity and improving the yield.
In some embodiments, the optical lens satisfies the following conditional expression:
-0.5<（R61+R62）/ f6<-0.2；（8）
wherein R61 represents a radius of curvature of the object-side surface of the sixth lens, R62 represents a radius of curvature of the image-side surface of the sixth lens, and f6 represents an effective focal length of the sixth lens. When the condition formula (8) is satisfied, the surface shape of the sixth lens can be reasonably controlled, the sensitivity of the system is reduced, the manufacturing yield is improved by reducing the molding difficulty, meanwhile, stray light generated by the lens can be reduced, and the imaging quality of the lens is improved.
In some embodiments, the optical lens satisfies the following conditional expression:
-0.5<(R11-R12)/(R11+R12)<-0.3；（9）
where R11 represents a radius of curvature of the object side surface of the first lens, and R12 represents a radius of curvature of the image side surface of the first lens. When the above conditional expression (9) is satisfied, the surface shape of the first lens is reasonably limited to correct the off-axis aberration, and the light can have proper incident and emergent angles in the first lens, which is helpful to increase the angle of view and the area of the imaging surface, reduce the outer diameter of the front lens of the lens, and maintain the miniaturization of the system.
In some embodiments, the optical lens satisfies the following conditional expression:
-2.5<SAG71/CT7<-1.5；（10）
wherein SAG71 represents the edge sagittal height of the seventh lens object side, and CT7 represents the center thickness of the seventh lens. When the above conditional expression (10) is satisfied, the ratio of the sagittal height to the thickness of the seventh lens can be properly adjusted, which is beneficial to lens manufacturing and molding, improves the manufacturing yield, and shortens the total length of the optical lens.
In some embodiments, the optical lens satisfies the following conditional expression:
1.4<f1/f<2.7；（11）
wherein f represents an effective focal length of the optical lens, and f1 represents an effective focal length of the first lens. When the above conditional expression (11) is satisfied, the first lens can be made to have a proper positive power, and the converging light can be effectively converged, and the optical total length of the optical lens can be effectively compressed.
In some embodiments, the optical lens satisfies the following conditional expression:
0.9<f2/f<3.3；（12）
wherein f represents an effective focal length of the optical lens, and f2 represents an effective focal length of the second lens. When the above conditional expression (12) is satisfied, the second lens can have proper positive focal power, and the light deflection angle is reduced while converging the light, so that the light trend is stably transited.
In some embodiments, the optical lens satisfies the following conditional expression:
-3.5<f3/f<-1.0；（13）
wherein f represents an effective focal length of the optical lens, and f3 represents an effective focal length of the third lens. When the conditional expression (13) is satisfied, the third lens can have proper negative focal power, which is favorable for balancing the spherical aberration of the optical lens and improving the imaging quality of the optical lens.
In some embodiments, the optical lens satisfies the following conditional expression:
-12.0<f4/f<-2.0；（14）
wherein f represents an effective focal length of the optical lens, and f4 represents an effective focal length of the fourth lens. When the above conditional expression (14) is satisfied, the fourth lens can have a suitable negative focal power, which is favorable for balancing coma aberration generated by the third lens and astigmatism of the lens, thereby improving imaging quality of the lens.
In some embodiments, the optical lens satisfies the following conditional expression:
0.6<f5/f<1.0；（15）
wherein f represents an effective focal length of the optical lens, and f5 represents an effective focal length of the fifth lens. When the above conditional expression (15) is satisfied, the fifth lens can have appropriate positive focal power, reduce the light deflection angle while converging light, make the light trend transition smoothly, balance various aberrations generated by the optical lens, and improve the imaging quality of the optical lens.
In some embodiments, the optical lens satisfies the following conditional expression:
-2.5<f6/f<-1.8；（16）
wherein f represents an effective focal length of the optical lens, and f6 represents an effective focal length of the sixth lens. When the conditional expression (16) is satisfied, the sixth lens can have proper negative focal power, which is beneficial to increasing the imaging area of the optical lens, and meanwhile, the chromatic aberration of the optical lens can be optimized, and the imaging quality of the optical lens is improved.
In some embodiments, the optical lens satisfies the following conditional expression:
-1.2<f7/f<-0.8；（17）
wherein f represents an effective focal length of the optical lens, and f7 represents an effective focal length of the seventh lens. When the conditional expression (17) is satisfied, the seventh lens can have proper negative focal power, which is beneficial to increasing the imaging area of the optical lens, and meanwhile, the chromatic aberration of the optical lens can be optimized, and the imaging quality of the optical lens is improved.
As an implementation mode, a seven-piece plastic aspheric lens structure is adopted, and the structure is compact by reasonably restraining the surface and focal power of each lens, so that the characteristics of large aperture, long focal length and small depth of field are realized. By adopting the aspheric lens, the cost can be effectively reduced, the aberration can be corrected, and an optical performance product with higher cost performance can be provided.
The application is further illustrated in the following examples. In various embodiments, the thickness, radius of curvature, and material selection portion of each lens in the optical lens may vary, and for specific differences, reference may be made to the parameter tables of the various embodiments. The following examples are merely preferred embodiments of the present application, but the embodiments of the present application are not limited to the following examples, and any other changes, substitutions, combinations or simplifications that do not depart from the gist of the present application are intended to be equivalent substitutes within the scope of the present application.
In various embodiments of the present application, when the lens in the optical lens is an aspherical lens, the aspherical surface profile of the lens satisfies the following equation:
；
where z is the distance sagittal height from the aspherical surface vertex when the aspherical surface is at a position of height h in the optical axis direction, c is the paraxial curvature of the surface, k is the quadric coefficient, A 2i The aspherical surface profile coefficient of the 2 i-th order.
First embodiment
Referring to fig. 1, a schematic structural diagram of an optical lens 100 according to a first embodiment of the present application is shown, where the optical lens 100 includes, in order from an object side to an imaging plane along an optical axis: stop ST, first lens L1, second lens L2, third lens L3, fourth lens L4, fifth lens L5, sixth lens L6, seventh lens L7, and filter G1.
The first lens element L1 has positive refractive power, wherein an object-side surface S1 of the first lens element is convex, and an image-side surface S2 of the first lens element is concave;
the second lens element L2 has positive refractive power, wherein an object-side surface S3 of the second lens element is convex at a paraxial region thereof, and an image-side surface S4 of the second lens element is concave at a paraxial region thereof;
the third lens element L3 has negative refractive power, wherein an object-side surface S5 of the third lens element is convex at a paraxial region thereof, and an image-side surface S6 of the third lens element is concave at a paraxial region thereof;
the fourth lens element L4 has negative refractive power, wherein an object-side surface S7 of the fourth lens element is convex at a paraxial region thereof, and an image-side surface S8 of the fourth lens element is concave at a paraxial region thereof;
the fifth lens element L5 has positive refractive power, wherein an object-side surface S9 of the fifth lens element is concave, and an image-side surface S10 of the fifth lens element is convex;
the sixth lens element L6 has negative refractive power, wherein an object-side surface S11 of the sixth lens element is convex at a paraxial region thereof and an image-side surface S12 of the sixth lens element is concave at a paraxial region thereof;
the seventh lens L7 has negative focal power, the object-side surface S13 of the seventh lens is concave at a paraxial region, and the image-side surface S14 of the seventh lens is concave at a paraxial region;
the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6 and the seventh lens L7 are all plastic aspheric lenses.
Specifically, the design parameters of each lens of the optical lens 100 provided in this embodiment are shown in table 1.
TABLE 1
In this embodiment, the aspherical parameters of each lens in the optical lens 100 are shown in table 2.
TABLE 2
Referring to fig. 2, 3 and 4, an F-Tan (θ) distortion curve, a field curvature curve and a vertical axis chromatic aberration curve of the optical lens 100 are shown. Wherein, F-Tan (theta) distortion of the lens is less than 2%, the offset of the field curvature is controlled within +/-0.15 mm, the offset of the vertical axis chromatic aberration is controlled within +/-2 mu m, which indicates that the distortion, the field curvature and the on-axis spherical aberration of the optical lens 100 are 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 application is shown, and the optical lens 200 according to the present embodiment is substantially the same as the first embodiment, and the main differences are that: the image-side surface of the second lens element is convex at a paraxial region, the object-side surface of the third lens element is concave at a paraxial region, the object-side surface of the fourth lens element is concave at a paraxial region, the object-side surface of the fifth lens element is convex at a paraxial region, and the lens surfaces have different radii of curvature, aspheric coefficients, and thicknesses.
Specifically, the design parameters of the optical lens 200 provided in this embodiment are shown in table 3.
TABLE 3 Table 3
In this embodiment, the aspherical parameters of each lens in the optical lens 200 are shown in table 4.
TABLE 4 Table 4
Referring to fig. 6, 7 and 8, an F-Tan (θ) distortion curve, a field curvature curve and a vertical axis chromatic aberration curve of the optical lens 200 are shown. Wherein, F-Tan (theta) distortion of the lens is less than 2%, the offset of the field curvature is controlled within +/-0.08 mm, and the offset of the vertical axis chromatic aberration is controlled within +/-2 mu m, which indicates that the distortion, the field curvature and the vertical axis chromatic aberration of the optical lens 200 are 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 application is shown, and the optical lens 300 of the present embodiment is substantially the same as the first embodiment, and the main differences are that: the image side surface of the second lens element is convex at a paraxial region, and the curvature radius, aspherical coefficient, and thickness of each lens element are different.
Specifically, the design parameters of the optical lens 300 provided in this embodiment are shown in table 5.
TABLE 5
In this embodiment, the aspherical parameters of each lens in the optical lens 300 are shown in table 6.
TABLE 6
Referring to fig. 10, 11 and 12, an F-Tan (θ) distortion curve, a field curvature curve and a vertical axis chromatic aberration curve of the optical lens 300 are shown. Wherein, F-Tan (theta) distortion of the lens is less than 2%, the offset of the field curvature is controlled within +/-0.06 mm, and the offset of the vertical axis chromatic aberration is controlled within +/-2 mu m, which indicates that the distortion, the field curvature and the vertical axis chromatic aberration of the optical lens 300 are well corrected.
Referring to table 7, the optical characteristics of the optical lens provided in the above three embodiments, including the angle of view 2θ, the total optical length TTL, the actual half image height IH, the effective focal length f, and the correlation values corresponding to each of the above conditions, are shown.
TABLE 7
Compared with the prior art, the plastic optical lens provided by the application has at least the following advantages:
(1) Seven plastic aspherical lenses are adopted, and through reasonably arranging diaphragms and the shapes of the lenses, the lens has high imaging quality of pixels.
(2) The optical lens provided by the application adopts seven plastic aspherical lenses, meets the requirement of a large aperture of the lens through specific surface shape collocation and reasonable focal power distribution, and has the advantages of long focal length, small depth of field and the like.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means 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 present application. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiments or examples. 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 foregoing examples illustrate only a few embodiments of the application and are described in detail herein without thereby limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of protection of the present application is to be determined by the appended claims.
Claims (11)
1. An optical lens comprising seven lenses in total, in order from an object side to an imaging surface along an optical axis, comprising:
a diaphragm;
a first lens with positive focal power, 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 second lens having positive optical power, an object side surface of the second lens being convex at a paraxial region;
a third lens having negative optical power, an image side surface of the third lens being a concave surface;
a fourth lens having negative optical power, an image-side surface of the fourth lens being concave at a paraxial region;
a fifth lens having positive optical power, an image side surface of the fifth lens being a convex surface;
a sixth lens element with negative refractive power having a convex object-side surface at a paraxial region and a concave image-side surface at a paraxial region;
a seventh lens having negative optical power, an object-side surface of the seventh lens being concave at a paraxial region, an image-side surface of the seventh lens being concave at a paraxial region;
the optical lens satisfies the following conditional expression:
-2.5<f6/f<-1.8；
wherein f represents an effective focal length of the optical lens, and f6 represents an effective focal length of the sixth lens.
2. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:
1.75<f/EPD<1.8；
where f represents the effective focal length of the optical lens and EPD represents the entrance pupil diameter of the optical lens.
3. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:
0.6<IH/TTL <0.8；
wherein IH represents half image height of the optical lens, and TTL represents total optical length of the optical lens.
4. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:
3<(f1+f2)/f <5；
wherein f1 represents an effective focal length of the first lens, f2 represents an effective focal length of the second lens, and f represents an effective focal length of the optical lens.
5. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:
-15<(f3+f4)/f <-4；
wherein f3 represents an effective focal length of the third lens, f4 represents an effective focal length of the fourth lens, and f represents an effective focal length of the optical lens.
6. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:
0<CT7/DM7 <0.15；
0.8<DM6/DM7<1；
wherein CT7 represents the center thickness of the seventh lens, DM6 represents the effective aperture of the sixth lens, and DM7 represents the effective aperture of the seventh lens.
7. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:
-2<SAG61/SAG62<10；
wherein SAG61 represents the sagittal height at the object-side effective aperture of the sixth lens, and SAG62 represents the sagittal height at the image-side effective aperture of the sixth lens.
8. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:
-0.5<（R61+R62）/ f6<-0.2；
wherein R61 represents a radius of curvature of the object-side surface of the sixth lens, R62 represents a radius of curvature of the image-side surface of the sixth lens, and f6 represents an effective focal length of the sixth lens.
9. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:
-0.5<(R11-R12)/(R11+R12)<-0.3；
where R11 represents a radius of curvature of the object side surface of the first lens, and R12 represents a radius of curvature of the image side surface of the first lens.
10. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:
-2.5<SAG71/CT7<-1.5；
wherein SAG71 represents the edge sagittal height of the seventh lens object side, and CT7 represents the center thickness of the seventh lens.
11. An imaging device comprising an optical lens as claimed in any one of claims 1 to 10 and an imaging element for converting an optical image formed by the optical lens into an electrical signal.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117406398A (en) * | 2023-12-14 | 2024-01-16 | 江西联创电子有限公司 | Optical lens |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107102425A (en) * | 2017-07-06 | 2017-08-29 | 浙江舜宇光学有限公司 | Optical imaging lens |
| US20180348484A1 (en) * | 2017-06-03 | 2018-12-06 | Largan Precision Co., Ltd. | Image capturing lens assembly, imaging apparatus and electronic device |
| CN211786326U (en) * | 2020-04-02 | 2020-10-27 | 南昌欧菲精密光学制品有限公司 | Optical imaging lens, imaging module and electronic device |
| CN114167582A (en) * | 2021-11-23 | 2022-03-11 | 江西晶超光学有限公司 | Optical lens, camera module and electronic equipment |
| WO2022061904A1 (en) * | 2020-09-28 | 2022-03-31 | 欧菲光集团股份有限公司 | Optical system, camera module, and terminal device |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20180348484A1 (en) * | 2017-06-03 | 2018-12-06 | Largan Precision Co., Ltd. | Image capturing lens assembly, imaging apparatus and electronic device |
| CN107102425A (en) * | 2017-07-06 | 2017-08-29 | 浙江舜宇光学有限公司 | Optical imaging lens |
| CN211786326U (en) * | 2020-04-02 | 2020-10-27 | 南昌欧菲精密光学制品有限公司 | Optical imaging lens, imaging module and electronic device |
| WO2022061904A1 (en) * | 2020-09-28 | 2022-03-31 | 欧菲光集团股份有限公司 | Optical system, camera module, and terminal device |
| CN114167582A (en) * | 2021-11-23 | 2022-03-11 | 江西晶超光学有限公司 | Optical lens, camera module and electronic equipment |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117406398A (en) * | 2023-12-14 | 2024-01-16 | 江西联创电子有限公司 | Optical lens |
| CN117406398B (en) * | 2023-12-14 | 2024-03-08 | 江西联创电子有限公司 | Optical lens |
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