CN117075313B - Optical lens - Google Patents
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- CN117075313B CN117075313B CN202311347572.2A CN202311347572A CN117075313B CN 117075313 B CN117075313 B CN 117075313B CN 202311347572 A CN202311347572 A CN 202311347572A CN 117075313 B CN117075313 B CN 117075313B
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- 230000003287 optical effect Effects 0.000 title claims abstract description 170
- 238000003384 imaging method Methods 0.000 claims abstract description 40
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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
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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- G—PHYSICS
- G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
- G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
- G03B30/00—Camera modules comprising integrated lens units and imaging units, specially adapted for being embedded in other devices, e.g. mobile phones or vehicles
Abstract
The invention discloses an optical lens, which sequentially comprises from an object side to an imaging surface along an 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 element with negative refractive power having a convex object-side surface and a concave image-side surface; the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface; the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a convex surface; a fifth lens element with positive refractive power having a convex object-side surface and a concave image-side surface; a sixth lens with positive focal power, the object side surface of which is a convex surface; a seventh lens element with negative refractive power having a concave object-side surface and a concave image-side surface; the optical lens at least comprises a plastic lens and a glass lens. The optical lens adopts glass-plastic mixed lens collocation, and the lens has the advantages of long focal length, large aperture, large target surface imaging and high pixel through specific surface collocation and focal power combination.
Description
Technical Field
The invention relates to the technical field of imaging lenses, in particular to an optical lens.
Background
With the continuous upgrading and updating of smart phones, consumers have higher and higher requirements on the shooting function of the mobile phones, and ultra-high pixel, large aperture and long focus shooting become main development trend of mobile phone lenses. In order to pursue high-quality imaging, currently, all plastic lenses are mostly adopted in the main-stream mobile phone lens, and the number of lenses is increased from 5-6 lenses to 7-8 lenses for correcting the optical path, but the lenses are limited by factors such as light and thin mobile phones, light transmittance of the plastic lenses, assembly precision and the like, the number of the plastic lenses is difficult to further increase, and the all plastic lenses meet the bottleneck period. The glass lens has better light transmittance and smaller chromatic dispersion, can effectively correct chromatic aberration and shorten the total length of the system, so that the glass-plastic mixed lens combining the advantages of the glass lens and the plastic lens can effectively reduce the total length of the lens and correct the chromatic aberration of the system, and improve the light inlet quantity and imaging definition of the optical lens, is widely applied to equipment such as security monitoring, digital cameras, single-lens reflex cameras and the like, and is hopeful to be applied to high-end flagship type main shooting.
Compared with a full plastic lens, the glass-plastic mixed lens has higher light transmittance and more stable performance, can improve imaging effects under different shades, and is a development trend of future mobile phone lenses. However, how to better realize the long focal length, large aperture, high pixel and small size performance of the glass-plastic hybrid lens is still an urgent problem to be solved.
Disclosure of Invention
Therefore, the invention aims to provide an optical lens which has at least the advantages of long focal length, large aperture, large target surface imaging and high pixel.
The embodiment of the invention realizes the aim through the following technical scheme.
The invention provides an optical lens, seven lenses altogether, including in order from the object side to the imaging surface along the 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 with negative focal power, wherein the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface;
a third lens with positive focal power, wherein the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface;
a fourth lens with negative focal power, wherein the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a convex surface;
a fifth lens with positive focal power, wherein an object side surface of the fifth lens is a convex surface, and an image side surface of the fifth lens is a concave surface;
a sixth lens having positive optical power, an object side surface of the sixth lens being a convex surface;
a seventh lens with negative focal power, wherein an object side surface of the seventh lens is a concave surface, and an image side surface of the seventh lens is a concave surface;
wherein the optical lens at least comprises a plastic lens and a glass lens;
the effective focal length f of the optical lens and the focal length f4 of the fourth lens satisfy: f4/f < -10 >.
Compared with the prior art, the optical lens provided by the invention adopts the glass-plastic mixed lens for matching, and through the reasonable matching of the three negative focal power lenses and the four positive focal power lenses, the structure of the lens is compact, the lens has a longer focal length, and simultaneously has a larger aperture and higher imaging quality, and the lens can be matched with a large target chip to realize high-definition imaging; the invention can reasonably correct the aberration of the system, effectively shorten the overall length of the system while ensuring that the lens has high pixels, and better meet the use requirements of miniaturization, high image quality and long-focus shooting of electronic equipment.
Drawings
The foregoing and/or additional aspects and advantages of the invention will become apparent and may be readily appreciated from the following description of the 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 invention;
FIG. 2 is a graph showing f-tan θ distortion of an optical lens according to a first embodiment of the present invention;
FIG. 3 is a graph showing a field curvature of an optical lens according to a first embodiment of the present invention;
FIG. 4 is an axial aberration diagram of an optical lens according to a first embodiment of the present invention;
FIG. 5 is a graph showing a vertical axis chromatic aberration curve of an optical lens according to a first embodiment of the present invention;
FIG. 6 is a schematic diagram of an optical lens according to a second embodiment of the present invention;
FIG. 7 is a graph of f-tan θ distortion of an optical lens according to a second embodiment of the present invention;
FIG. 8 is a graph showing a field curvature of an optical lens according to a second embodiment of the present invention;
FIG. 9 is an axial aberration diagram of an optical lens according to a second embodiment of the present invention;
FIG. 10 is a graph showing a vertical axis chromatic aberration curve of an optical lens according to a second embodiment of the present invention;
FIG. 11 is a schematic diagram of an optical lens according to a third embodiment of the present invention;
FIG. 12 is a graph showing f-tan θ distortion of an optical lens according to a third embodiment of the present invention;
FIG. 13 is a graph showing a field curvature of an optical lens according to a third embodiment of the present invention;
FIG. 14 is an axial aberration diagram of an optical lens according to a third embodiment of the present invention;
fig. 15 is a vertical axis chromatic aberration diagram of an optical lens according to a third embodiment of the present invention.
Detailed Description
For a better understanding of the present application, various aspects of the present application will be described in more detail with reference to the accompanying drawings. It should be understood that these detailed descriptions are merely illustrative of embodiments of the present application and are not intended to limit the scope of the present 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 invention.
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 present application, use of "may" means "one or more embodiments of the present 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, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. The present application will be described in detail below with reference to the accompanying drawings in conjunction with embodiments.
The invention 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: a diaphragm, a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an optical filter.
The first lens has positive focal power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface;
the second lens has negative focal power, the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface;
the third lens has positive focal power, the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface;
the fourth lens has negative focal power, the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a convex surface;
the fifth lens has positive focal power, the object side surface of the fifth lens is a convex surface, and the image side surface of the fifth lens is a concave surface;
the sixth lens has positive focal power, and the object side surface of the sixth lens is a convex surface;
the seventh lens has negative focal power, the object side surface of the seventh lens is a concave surface, and the image side surface of the seventh lens is a concave surface;
wherein, at least one plastic lens and one glass lens are contained in the optical lens. Compared with a plastic lens, the glass lens has the advantages of smaller dispersion coefficient, better light transmittance, stronger stability and the like, and can greatly reduce the problems of glare, ghosting and the like, and the glass plastic lens combines the advantages of the glass lens and the plastic lens, can reduce the thickness and the distortion rate of the lens, and improves the imaging definition and the aperture size.
According to the invention, through the mixing and collocation of glass and plastic lenses and the reasonable constraint of the surface and focal power of each lens, the structure is compact, and the lens has high imaging quality and large aperture, so that the miniaturization of the lens and the reasonable balance of high pixels are better realized.
In some embodiments, the optical lens satisfies the following conditional expression:
f4/f<-10； （1）
wherein f4 represents an effective focal length of the fourth lens of the optical lens, and f represents an effective focal length of the optical lens. The conditional expression (1) is satisfied, so that the fourth lens has negative focal power, which is favorable for balancing the coma aberration generated by the third lens and the astigmatism of the lens, thereby improving the imaging quality of the lens.
In some embodiments, the optical lens satisfies the following conditional expression:
0.9<IH/EPND<1.2； （2）
4.5mm<EPND<5.5mm；（3）
wherein IH represents half of the diagonal length of the effective pixel area on the imaging surface of the optical lens, and EPND represents the entrance pupil diameter of the optical lens. The optical lens can have a large target surface and can be matched with a 1/1.49 inch large-bottom COMS chip, so that the resolution of the lens and the detail reduction degree of an image can be improved; meanwhile, the lens can also have an ultra-large entrance pupil aperture, so that the shooting effect of the lens in a dim environment can be greatly improved.
In some embodiments, the optical lens satisfies the following conditional expression:
1.4<f /EPND<1.8；（4）
7.5mm<f<8.6mm； （5）
where f represents an effective focal length of the optical lens, and EPND represents an entrance pupil diameter of the optical lens. The conditions (4) and (5) are met, and the lens can be provided with a large aperture, so that the luminous flux of the lens is improved, and the imaging quality of the lens is improved; meanwhile, the lens can have a longer focal length, long-focal-length imaging of the lens is facilitated, and a portrait shooting effect with a small depth of field is better achieved.
In some embodiments, the optical lens satisfies the following conditional expression:
0.8<f1/f<1.1； （6）
80<Vd1<85； （7）
wherein f1 represents a focal length of the first lens, f represents an effective focal length of the optical lens, and Vd1 represents an abbe number of the first lens. The conditions (6) and (7) are satisfied, the focal power and the materials of the first lens can be reasonably arranged, the first lens has positive focal power and also has a high Abbe number, the difficulty of correcting chromatic aberration is reduced, and the imaging quality of the lens is effectively improved.
In some embodiments, the optical lens satisfies the following conditional expression:
32<f×(43.27/(2IH))<35； （8）
where f represents an effective focal length of the optical lens, and IH represents a half of a diagonal length of an effective pixel region on an imaging surface of the optical lens. The condition (8) is satisfied, so that the lens can be used for imaging at the human focus Duan Chengxiang of 35mm, and the imaging visual angle is close to the human eye visual angle, thereby being beneficial to improving the natural realism of an imaging picture.
In some embodiments, the optical lens satisfies the following conditional expression:
1.5<TTL/∑CT<1.9； （9）
wherein TTL represents the total optical length of the lens, and ΣCT represents the sum of the thicknesses of the centers of the first lens to the seventh lens on the optical axis, respectively. The above condition (9) is satisfied, by reasonably distributing the center thicknesses of the first lens to the seventh lens, the sensitivity of the center thickness of each lens in the optical lens can be reduced, the manufacturing yield is improved, and meanwhile, the total length of the optical system is reduced, and the miniaturization of the optical system is maintained so as to be applied to portable electronic products.
In some embodiments, the optical lens satisfies the following conditional expression:
1.2<f3/f<2.7； （10）
0.35<R31/R32<0.55； （11）
wherein f3 denotes a focal length of the third lens, f denotes an effective focal length of the optical lens, R31 denotes a radius of curvature of an object side surface of the third lens, and R32 denotes a radius of curvature of an image side surface of the third lens. The conditions (10) and (11) are met, the focal power of the third lens is reasonably distributed, the shape of the third lens is controlled, the aberration of the whole system is favorably balanced, the imaging quality is improved, meanwhile, the light trend can be reasonably controlled, and the problem of overhigh lens sensitivity caused by overlarge light deflection degree is avoided.
In some embodiments, the optical lens satisfies the following conditional expression:
0.7<DM4/DM1<0.8； （12）
0.4<DM4/DM7<0.6； （13）
wherein DM1 represents an optical effective diameter of the first lens, DM4 represents an optical effective diameter of the fourth lens, and DM7 represents an optical effective diameter of the seventh lens. The height drop among the first lens, the fourth lens and the seventh lens can be reasonably controlled by meeting the conditions (12) and (13), so that the lens can be miniaturized in size, the production difficulty of the lens can be reduced, and the yield of lens production can be improved.
In some embodiments, the optical lens satisfies the following conditional expression:
3.0<Nd5+ Nd6<4.0； （14）
0.5<f56/f<2.7； （15）
wherein Nd5 denotes a refractive index of the fifth lens, nd6 denotes a refractive index of the sixth lens, f56 denotes a combined focal length of the fifth lens and the sixth lens, and f denotes an effective focal length of the optical lens. The materials and focal power of the fifth lens and the sixth lens can be optimized by satisfying the above conditions (14) and (15), the rapid deflection of light rays can be realized, the total length of the lens can be shortened, and the light and thin portable electronic device can be realized.
In some embodiments, the optical lens satisfies the following conditional expression:
0.7<(Y R71 +Y R72 )/IH <1.1； （16）
wherein Y is R71 Represents the vertical distance between the inflection point on the object side surface of the seventh lens and the optical axis, Y R72 And IH represents half of the diagonal length of the effective pixel area on the imaging surface of the optical lens. The condition (16) is satisfied, so that the positions of the inflection points on the object side surface and the image side surface of the seventh lens can be reasonably limited, the coma correction of the off-axis visual field can be enhanced, meanwhile, the curvature of field can be well converged, and the imaging quality can be improved.
In some embodiments, the optical lens satisfies the following conditional expression:
-0.3<Sag62/d62<0 ； (17)
-0.4<Sag71/d71<0； (18)
where Sag62 represents the sagittal height of the image side surface of the sixth lens element, sag71 represents the sagittal height of the object side surface of the seventh lens element, d62 represents the light-transmitting half-diameter of the image side surface of the sixth lens element, and d71 represents the light-transmitting half-diameter of the object side surface of the seventh lens element. The conditional expressions (17) and (18) are satisfied, so that the deflection angles of the edge view field at the sixth lens and the seventh lens can be controlled, the sensitivity of the sixth lens and the seventh lens is reduced, and the yield of lens assembly production is improved.
In some embodiments, the effective focal length f of the optical lens is equal to the effective focal length f of the second lensFocal length f 2 The method meets the following conditions: -2.5<f 2 /f<-1.0. The second lens has proper negative focal power, so that the spherical aberration of the optical lens can be balanced, and the imaging quality of the optical lens can be improved.
In some embodiments, the effective focal length f of the optical lens and the focal length f of the fifth lens 5 The method meets the following conditions: 2.5<f 5 /f<5.5. The range is satisfied, the fifth lens has proper positive focal power, the light deflection angle is reduced while converging light, the light trend is stably transited, various aberrations generated by the optical lens are balanced, and the imaging quality of the optical lens is improved.
In some embodiments, the effective focal length f of the optical lens and the focal length f of the sixth lens 6 The method meets the following conditions: 0.6<f 6 /f<41.0. The range is satisfied, so that the sixth lens has proper positive focal power, the light deflection angle is reduced while converging light, the light trend is stably transited, various aberrations generated by the optical lens are balanced, and the imaging quality of the optical lens is improved.
In some embodiments, the effective focal length f of the optical lens and the focal length f of the seventh lens 7 The method meets the following conditions: -0.8<f 7 /f<-0.4. The range is satisfied, so that the seventh lens has proper negative focal power, the image height is increased, the chromatic aberration of the optical lens can be optimized, and the imaging quality of the optical lens is improved.
In some embodiments, the fourth to fifth lenses are air gap CT on the optical axis 45 Air gap CT on optical axis with fifth lens to sixth lens 56 The method meets the following conditions: 1.0<CT 45 /CT 56 <1.5. Satisfying the above range can slow down the deflection degree of light and reduce sensitivity.
As an implementation mode, the glass-plastic mixed matching structure of one glass lens and six plastic lenses is adopted, so that the lens can be better matched with a large target surface chip to realize high-definition imaging, and meanwhile, the reasonable balance of large aperture, miniaturization and long focal length of the lens can be realized. Because the first lens is made of glass aspheric surface materials, the geometrical chromatic aberration of the optical lens is effectively corrected through the characteristic of low chromatic dispersion of the glass. The first lens is a glass aspheric lens, the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are plastic aspheric lenses, and the aspheric lenses are adopted, so that the cost can be effectively reduced, the aberration can be corrected, and an optical performance product with higher cost performance can be provided. It should be noted that other matching combinations of the glass-plastic mixed lenses can also meet the requirements, and the selection can be specifically made according to the requirements.
The invention is further illustrated in the following examples. In various embodiments, the thickness, radius of curvature, and material selection 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 invention, but the embodiments of the present invention 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 invention are intended to be equivalent substitutes within the scope of the present invention.
In various embodiments of the present invention, when an aspherical lens is used as the lens, the surface shape of the aspherical 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 invention is shown, where the optical lens 100 includes, in order from an object side to an imaging surface S17 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 at a paraxial region thereof, and an image-side surface S2 of the first lens element is concave at a paraxial region thereof;
the second lens element L2 has negative 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 positive 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 thereof is concave at a paraxial region thereof and an image-side surface S8 thereof is convex 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 convex at a paraxial region thereof, and an image-side surface S10 of the fifth lens element is concave;
the sixth lens element L6 with positive refractive power has a convex object-side surface S11 at a paraxial region and a concave image-side surface S12 at a paraxial region;
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 object side surface of the filter G1 is S15, and the image side surface is S16.
The first lens L1 is a glass aspheric lens, and 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 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
The surface profile coefficients of the aspherical surfaces of the optical lens 100 in this embodiment are shown in table 2.
TABLE 2
Referring to fig. 2, 3, 4 and 5, an f-tan θ distortion curve, a field curvature curve, an axial aberration curve and a vertical axis aberration curve of the optical lens 100 are shown. As can be seen from fig. 2, the f-tan θ distortion value is controlled within ±2%, which indicates that the f-tan θ distortion correction of the optical lens 100 is better; as can be seen from fig. 3, the curvature of field is controlled within ±0.08mm, which indicates that the curvature of field of the optical lens 100 is better corrected; as can be seen from fig. 4, the axial aberration of the shortest wavelength and the maximum wavelength is controlled within ±0.03mm, which indicates that the axial aberration of the optical lens 100 is better corrected; as can be seen from fig. 5, the shift amount of the vertical chromatic aberration is controlled within ±1.5um, which indicates that the optical lens 100 can effectively correct the aberration of the fringe field of view and the secondary spectrum of the entire image plane.
Second embodiment
As shown in fig. 6, a schematic structural diagram of an optical lens 200 according to the present embodiment is provided, and the optical lens 200 according to the present embodiment is substantially the same as the first embodiment described above, and the main differences are that: the image side surface S12 of the sixth 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 200 provided in this embodiment are shown in table 3.
TABLE 3 Table 3
The surface profile coefficients of the aspherical surfaces of the optical lens 200 in this embodiment are shown in table 4.
TABLE 4 Table 4
Referring to fig. 7, 8, 9 and 10, an f-tan θ distortion curve, a field curvature curve, an axial aberration curve and a vertical axis aberration curve of the optical lens 200 are shown. As can be seen from fig. 7, the f-tan θ distortion value is controlled within ±1.5%, which indicates that the f-tan θ distortion correction of the optical lens 200 is better; as can be seen from fig. 8, the curvature of field is controlled within ±0.08mm, which indicates that the curvature of field of the optical lens 200 is better corrected; as can be seen from fig. 9, the axial aberration of the shortest wavelength and the maximum wavelength is controlled within ±0.04mm, which indicates that the axial aberration of the optical lens 200 is better corrected; as can be seen from fig. 10, the shift amount of the vertical chromatic aberration is controlled within ±2.0um, which indicates that the optical lens 200 can effectively correct the aberration of the fringe field of view and the secondary spectrum of the entire image plane.
Third embodiment
As shown in fig. 11, a schematic structural diagram of an optical lens 300 according to the present embodiment is provided, and the optical lens 300 according to the present embodiment is substantially the same as the first embodiment described above, and is mainly different in that an image side surface S12 of the sixth lens element is convex at a paraxial region, and curvature radius, aspheric coefficients, and thicknesses of lens surfaces are different.
Specifically, the design parameters of the optical lens 300 provided in this embodiment are shown in table 5.
TABLE 5
The surface profile coefficients of the aspherical surfaces of the optical lens 300 in this embodiment are shown in table 6.
TABLE 6
Referring to fig. 12, 13, 14 and 15, an f-tan θ distortion curve, a field curvature curve, an axial aberration curve and a vertical axis aberration curve of the optical lens 300 are shown. As can be seen from fig. 12, the f-tan θ distortion value is controlled within ±2%, which indicates that the f-tan θ distortion correction of the optical lens 300 is better; as can be seen from fig. 13, the curvature of field is controlled within ±0.06mm, which indicates that the curvature of field of the optical lens 300 is better corrected; as can be seen from fig. 14, the axial aberration of the shortest wavelength and the maximum wavelength is controlled within ±0.035mm, which indicates that the axial aberration of the optical lens 300 is better corrected; as can be seen from fig. 15, the shift amount of the vertical chromatic aberration is controlled within ±2.0um, which means that the optical lens 300 can effectively correct the aberration of the fringe field of view and the secondary spectrum of the entire image plane.
Referring to table 7, the optical characteristics of the optical lens provided in the above three embodiments, including the maximum field angle FOV, 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 glass-plastic mixed optical lens provided by the invention has at least the following advantages:
(1) The balance between high pixel and miniaturization can be realized. Because the glass has better light transmittance and lower dispersion coefficient, the optical lens provided by the invention adopts one glass lens and six plastic lenses, the optical quality of the optical lens is basically consistent with that of the currently mainstream 8 plastic lenses, the light transmittance and the optical performance are more excellent, and the balance of high pixels and miniaturization of the lens is realized.
(2) More layers of coating optimization can be realized. At present, a high-temperature process is mostly adopted for coating the plastic lens, and the plastic lens is more likely to deform under the process, so that the yield is lower, and the coating is usually not more than 5 layers; the glass lens has strong high temperature resistance, can realize that more layers of coating films are used for controlling reflection and dazzling light, and further improves the optical imaging quality.
(3) Large aperture performance can be achieved. Because each lens face type and focal power setting are reasonable to the diaphragm sets up before first lens, can make the camera lens have the characteristic of super large light ring, increases the luminous flux that gets into the camera lens to a certain extent, reduces the noise that produces when light is not enough and influences the image picture, makes the camera lens still have good imaging effect under dark environment night, thereby can satisfy the imaging demand of bright and dark environment.
In summary, the optical lens provided by the invention adopts a seven-piece glass-plastic mixed structure, and the optical lens is compact in structure, has a longer focal length and a larger aperture and higher imaging quality through specific surface shape arrangement and reasonable optical power distribution, and can be matched with a 50M high-pixel chip to realize high-definition imaging; meanwhile, through reasonably selecting the glass material of the first lens and adding the use of the aspheric surface, the aberration of the system can be reasonably corrected, so that the lens has high pixels, the overall length of the system is effectively shortened, and the use requirements of miniaturization and high image quality of electronic equipment are better met.
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 invention. 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 above examples merely represent a few embodiments of the present invention, which are described in more detail and are not to be construed as limiting the scope of the present invention. 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 invention, which are all within the scope of the invention. Accordingly, the scope of the invention should be assessed as that of 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 with negative focal power, wherein the object side surface of the second lens is a convex surface, and the image side surface of the second lens is a concave surface;
a third lens with positive focal power, wherein the object side surface of the third lens is a convex surface, and the image side surface of the third lens is a concave surface;
a fourth lens with negative focal power, wherein the object side surface of the fourth lens is a concave surface, and the image side surface of the fourth lens is a convex surface;
a fifth lens with positive focal power, wherein an object side surface of the fifth lens is a convex surface, and an image side surface of the fifth lens is a concave surface;
a sixth lens having positive optical power, an object side surface of the sixth lens being a convex surface;
a seventh lens with negative focal power, wherein an object side surface of the seventh lens is a concave surface, and an image side surface of the seventh lens is a concave surface;
the optical lens at least comprises a plastic lens and a glass lens;
the optical lens satisfies the following conditional expression:
f4/f<-10；
wherein f4 represents an effective focal length of the fourth lens of the optical lens, and f represents an effective focal length of the optical lens;
1.4<f/EPND<1.8；
where f represents an effective focal length of the optical lens, and EPND represents an entrance pupil diameter of the optical lens.
2. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:
0.9<IH/EPND<1.2；
4.5mm<EPND<5.5mm；
wherein IH represents half of the diagonal length of the effective pixel area on the imaging surface of the optical lens, and EPND 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:
7.5mm<f<8.6mm；
wherein f represents an effective focal length of the optical lens.
4. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:
0.8<f1/f<1.1；
80<Vd1<85；
wherein f1 represents a focal length of the first lens, f represents an effective focal length of the optical lens, and Vd1 represents an abbe number of the first lens.
5. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:
32<f×(43.27/(2IH))<35；
where f represents an effective focal length of the optical lens, and IH represents a half of a diagonal length of an effective pixel region on an imaging surface of the optical lens.
6. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:
1.5<TTL/∑CT<1.9；
wherein TTL represents the total optical length of the lens, and ΣCT represents the sum of the central thicknesses of the first lens to the seventh lens on the optical axis respectively.
7. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:
1.2<f3/f<2.7；
0.35<R31/R32<0.55;
wherein f3 denotes a focal length of the third lens, f denotes an effective focal length of the optical lens, R31 denotes a radius of curvature of an object side surface of the third lens, and R32 denotes a radius of curvature of an image side surface of the third lens.
8. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:
0.7<DM4/DM1<0.8；
0.4<DM4/DM7<0.6；
wherein DM1 represents an optical effective diameter of the first lens, DM4 represents an optical effective diameter of the fourth lens, and DM7 represents an optical effective diameter of the seventh lens.
9. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:
3.0<Nd5+ Nd6<4.0；
0.5<f56/f<2.7；
wherein Nd5 denotes a refractive index of the fifth lens, nd6 denotes a refractive index of the sixth lens, f56 denotes a combined focal length of the fifth lens and the sixth lens, and f denotes an effective focal length of the optical lens.
10. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:
0.7<(Y R71 +Y R72 )/IH <1.1；
wherein Y is R71 Represents the vertical distance between the inflection point on the object side surface of the seventh lens and the optical axis, Y R72 And IH represents half of the diagonal length of the effective pixel area on the imaging surface of the optical lens.
11. The optical lens according to claim 1, wherein the optical lens satisfies the following conditional expression:
-0.3<Sag62/d62<0 ;
-0.4<Sag71/d71<0 ;
where Sag62 represents the sagittal height of the image side surface of the sixth lens element, sag71 represents the sagittal height of the object side surface of the seventh lens element, d62 represents the light-transmitting half-diameter of the image side surface of the sixth lens element, and d71 represents the light-transmitting half-diameter of the object side surface of the seventh lens element.
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