CN113721350B - Optical lens and imaging apparatus - Google Patents

Optical lens and imaging apparatus Download PDF

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CN113721350B
CN113721350B CN202111279992.2A CN202111279992A CN113721350B CN 113721350 B CN113721350 B CN 113721350B CN 202111279992 A CN202111279992 A CN 202111279992A CN 113721350 B CN113721350 B CN 113721350B
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lens
optical
optical lens
image
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CN113721350A (en
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章彬炜
曾昊杰
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Jiangxi Lianyi Optics Co Ltd
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Jiangxi Lianyi Optics Co Ltd
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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
    • 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
    • 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
    • G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
    • G—PHYSICS
    • G03—PHOTOGRAPHY; CINEMATOGRAPHY; ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ELECTROGRAPHY; HOLOGRAPHY
    • G03B—APPARATUS OR ARRANGEMENTS FOR TAKING PHOTOGRAPHS OR FOR PROJECTING OR VIEWING THEM; APPARATUS OR ARRANGEMENTS EMPLOYING ANALOGOUS TECHNIQUES USING WAVES OTHER THAN OPTICAL WAVES; ACCESSORIES THEREFOR
    • G03B30/00—Camera modules comprising integrated lens units and imaging units, specially adapted for being embedded in other devices, e.g. mobile phones or vehicles

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Lenses (AREA)

Abstract

The invention discloses an optical lens and imaging equipment, the optical lens includes from the object side to the imaging surface along the optical axis in turn: a diaphragm; the first lens with positive focal power, its object side is a convex surface, the image side is a concave surface; a second lens element having a negative optical power, an object-side surface being convex at a paraxial region and an image-side surface being concave at a paraxial region; a third lens having positive optical power, an object-side surface of which is convex at a paraxial region; a fourth lens element having a negative optical power, an object-side surface being convex at a paraxial region and an image-side surface being concave at the paraxial region; a fifth lens element with positive refractive power having a concave object-side surface and a convex image-side surface; a sixth lens having a negative optical power; a seventh lens having a negative optical power. The first lens is a glass aspheric lens, and the other lenses are plastic aspheric lenses. The optical lens has the advantages of large aperture, large imaging target surface, high pixel, adjustability of AA process grouping and high yield.

Description

Optical lens and imaging apparatus
Technical Field
The present invention relates to the field of imaging lens technology, and in particular, to an optical lens and an imaging device.
Background
With the continuous upgrading and upgrading of smart phones, consumers have higher and higher requirements on the shooting function of the mobile phones, and ultrahigh pixels, large apertures and small sizes become the main development trend of mobile phone lenses. In order to pursue high-quality imaging, the current mainstream mobile phone lens mostly adopts all-plastic lenses, and the number of the lenses is upgraded from 5 to 6 to 7 to 8 for correcting the light path, but is limited by the factors such as the lightness and thinness of the mobile phone, the light transmittance of the plastic lenses, the 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 transmission and higher refractive index, and can effectively reduce the thickness, so the glass-plastic mixed lens combining the advantages of the glass lens and the plastic lens can effectively reduce the lens thickness and distortion rate, improve the imaging definition and the aperture size, is widely applied to equipment such as security monitoring, digital cameras, single lens reflex cameras and the like, and is expected to be applied to main shooting of high-end flagship models.
The glass-plastic hybrid lens uses glass lenses to replace a part of plastic lenses in the lens, and the current mainstream method is to match 6 plastic lenses with 1 glass lens. Compared with a plastic lens, the glass-plastic hybrid lens has higher light transmittance and more stable chemical performance, can improve the imaging effect under different brightness, and is a development trend of a future mobile phone lens. At the present stage, glass-plastic hybrid mobile phone lenses are all of an integrated structure, that is, all optical lenses are assembled in the same lens barrel, and the problems of non-adjustable lenses, low assembly yield, poor imaging quality and the like are solved. Therefore, it is a major breakthrough direction for manufacturers of mobile phone lenses to improve the assembly yield and the imaging quality of the glass-plastic hybrid lens.
Disclosure of Invention
Therefore, the present invention is directed to an optical lens and an imaging device, which have at least advantages of large aperture, large imaging target surface, high pixel, adjustable grouping meeting AA process, and high yield.
The embodiment of the invention implements the above object by the following technical scheme.
In a first aspect, the present invention provides an optical lens, comprising, in order from an object side to an image plane along an optical axis: a diaphragm; the lens comprises a first lens with positive focal power, a second lens and a third lens, wherein the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface; a second lens having a negative optical power, an object-side surface of the second lens being convex at a paraxial region and an image-side surface of the second lens being concave at a paraxial region; a third lens having positive optical power, an object side surface of the third lens being convex at a paraxial region; a fourth lens having a negative optical power, an object-side surface of the fourth lens being convex at a paraxial region and an image-side surface of the fourth lens being concave at a paraxial region; the lens comprises a fifth lens with positive focal power, wherein the object side surface of the fifth lens is a concave surface, and the image side surface of the fifth lens is a convex surface; a sixth lens having a negative optical power, an object side surface of the sixth lens being convex at a paraxial region and having at least one inflection point, an image side surface of the sixth lens being concave at a paraxial region and having at least one inflection point; a seventh lens having a 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 and having at least one inflection point; the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are all plastic aspheric lenses, and the first lens is a glass aspheric lens; the optical lens satisfies the following conditional expression: 0.02< AC1/TTL < 0.12; 0.04< ET1/TTL < 0.12; wherein AC1 denotes an air gap on an optical axis between the first lens and the second lens, ET1 denotes an edge thickness of the first lens, and TTL denotes an optical total 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 are composed of 1 glass lens and 6 plastic lenses, and the optical lens has a large aperture and ultrahigh pixels through specific surface shape collocation and reasonable focal power distribution, and can be matched with a 50M/108M imaging chip to realize ultrahigh-definition imaging; meanwhile, the AA process group is adjustable, and the manufacturing yield and the imaging quality can be effectively improved; meanwhile, the glass material of the first lens is reasonably selected, and the aspheric surface is used for reasonably correcting aberration, so that the lens has ultrahigh pixels, the total length of the system is effectively shortened, and the use requirements of miniaturization and high image quality of electronic equipment are better met.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural diagram of an optical lens according to a first embodiment of the present invention;
FIG. 2 is a graph showing the f-tan θ distortion of an optical lens according to a first embodiment of the present invention;
FIG. 3 is a paraxial curvature of field plot 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 graph showing the f-tan θ distortion of an optical lens according to a second embodiment of the present invention;
FIG. 7 is a paraxial curvature of field plot 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 graph showing the f-tan θ distortion of an optical lens according to a third embodiment of the present invention;
FIG. 11 is a paraxial curvature of field plot of an optical lens according to a third embodiment of the present invention;
FIG. 12 is a vertical axis chromatic aberration diagram of an optical lens according to a third embodiment of the present invention;
FIG. 13 is a schematic view of lens grouping;
FIG. 14 is a schematic diagram of active calibration of lens subgroup AA processes;
FIG. 15 is a schematic diagram illustrating a vertical distance between an inflection point of an object-side surface of the sixth lens element and an image-side surface of the seventh lens element and an optical axis;
fig. 16 is a schematic configuration diagram of an image forming apparatus according to a fourth embodiment of the present invention.
Detailed Description
In order to make the objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. Several embodiments of the invention are presented in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Like reference numerals refer to like elements throughout the specification.
The present invention provides an optical lens, sequentially including, from an object side to an image plane along an optical axis: the optical system comprises 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, wherein the diaphragm and the first lens form a first group, the second lens to the seventh lens form a second group, and the specific schematic diagrams of the first group and the second group can be seen in fig. 13; fig. 14 shows a schematic diagram of active calibration of the AA processes of the first group and the second group, in which the first group and the second group are designed by a split optical machine, and during assembly, after the first group and the second group are assembled respectively, the first group and the second group are actively calibrated to the optimal imaging position according to the AA processes.
A first lens in the optical 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 convex at a paraxial region, and the image side surface of the second lens is concave at the paraxial region;
the third lens has a positive optical power, and the object side surface of the third lens is convex at a paraxial region;
the fourth lens has negative focal power, the object side surface of the fourth lens is convex at a paraxial region, and the image side surface of the fourth lens is concave at the paraxial region;
the fifth lens has positive focal power, the object side surface of the fifth lens is a concave surface, and the image side surface of the fifth lens is a convex surface;
the sixth lens element has a negative optical power, an object-side surface of the sixth lens element being convex at a paraxial region and having at least one inflection point, and an image-side surface of the sixth lens element being concave at the paraxial region and having at least one inflection point;
the seventh lens element has a negative optical power, an object-side surface of the seventh lens element being concave at a paraxial region, an image-side surface of the seventh lens element being concave at a paraxial region, and having at least one inflection point;
in the above lens elements, the first lens element is a glass aspheric lens element, and the second, third, fourth, fifth, sixth and seventh lens elements are plastic aspheric lens elements. The optical lens adopts a glass-plastic mixed lens combination, has large aperture and ultrahigh pixels through specific surface shape collocation and reasonable focal power distribution, and can be matched with a 50M/108M imaging chip to realize ultrahigh-definition imaging.
In some embodiments, the optical lens satisfies the following conditional expression:
0.02<AC1/TTL<0.12；（1）
0.04<ET1/TTL<0.12；（2）
where AC1 denotes an air gap on the optical axis between the first lens and the second lens, ET1 denotes an edge thickness of the first lens, and TTL denotes an optical total length of the optical lens. The condition formulas (1) and (2) are met, so that on one hand, the first lens is ensured to have enough edge thickness, and the problem of lens edge cracking caused by an equipment manipulator in the process of clamping the lens can be avoided; on the other hand, the air gap between the first lens and the second lens on the optical axis can be reasonably distributed, so that the lens can meet the design of a split type optical machine, Active Alignment of the first group and the second group is realized through AA (Active Alignment) machine equipment, and the two groups are actively aligned, so that the imaging quality and the production yield of the lens are effectively improved.
In some embodiments, the optical lens satisfies the following conditional expression:
-1.2mm<(Nd1/Vd1)*f2<-0.3mm；（3）
where Nd1 denotes a refractive index of a material of the first lens, Vd1 denotes an abbe number of the material of the first lens, and f2 denotes a focal length of the second lens. By reasonably selecting the glass material of the first lens, the total length of the optical lens is effectively shortened while the lens has ultrahigh pixels. The negative spherical aberration generated by the first lens is properly balanced through the negative focal power of the second lens, so that the aberration of the optical system can be corrected, the imaging quality is improved, and the system miniaturization is maintained.
In some embodiments, the optical lens satisfies the following conditional expression:
1.65<f/EPD<1.9；（4）
where f denotes a focal length of the optical lens, and EPD denotes an entrance pupil diameter of the optical lens. Satisfy conditional expression (4), show that optical lens has the characteristic of super large light ring, increase the luminous flux that gets into the camera lens to a certain extent, reduce the noise that produces when light is not enough and to the influence of formation of image picture to make the camera lens under dark environment at night, still can have good imaging effect, can satisfy the imaging demand of light and shade environment.
In some embodiments, the optical lens satisfies the following conditional expression:
IH>5.2mm；（5）
0.4<EPD/IH<0.8；（6）
wherein EPD represents the entrance pupil diameter of the optical lens, and IH represents the actual half-image height of the optical lens. The condition formula (5) is met, the optical lens is shown to have a larger image surface, and the ultrahigh-definition imaging can be realized by matching with a 50M/108M large target surface imaging chip; and meanwhile, conditional expressions (5) and (6) are met, so that the reasonable balance between the large light flux and the large imaging surface of the lens can be realized, and the lens has the characteristics of large pixels and an oversized aperture.
In some embodiments, the optical lens satisfies the following conditional expression:
1<f12/f<1.6；（7）
where f12 denotes a combined focal length of the first lens and the second lens, and f denotes a focal length of the optical lens. Satisfying the conditional expression (7), the focal power of the combination of the first lens and the second lens can be appropriately balanced, the aberration of the optical system can be further corrected, and the back focal length of the system can be shortened to maintain the miniaturization of the system.
In some embodiments, the optical lens satisfies the following conditional expression:
0mm<IH-f×tan(θ)<0.15mm；（8）
where θ represents a half field angle of the optical lens, IH represents an actual half image height of the optical lens, and f represents a focal length of the optical lens. The conditional expression (8) is satisfied, which shows that the system distortion is well inhibited on the premise that the optical lens has a large field angle; if the IH-f multiplied by tan (theta) value exceeds the lower limit, the optical imaging system has larger negative distortion, and the shot graph can generate obvious deformation and become a barrel shape, thereby influencing the imaging effect; if the IH-f multiplied by tan (theta) value exceeds the upper limit, the optical imaging system has larger positive distortion, and the shot pattern can generate obvious deformation and pillow shape, thus influencing the imaging effect.
In some embodiments, the optical lens satisfies the following conditional expression:
3.0<EPD/BFL<3.8；（9）
wherein EPD represents an entrance pupil diameter of the optical lens, and BFL represents a back focal length of the optical lens. Satisfying the conditional expression (9), the lens can obtain a shorter back focus under the configuration of a large aperture, so as to further realize the miniaturization of the combination of the lens and the imaging chip.
In some embodiments, the optical lens satisfies the following conditional expression:
0.03<YR61/IH<0.33；（10）
0.2<YR72/IH<0.3；（11）
wherein IH represents the actual half image height of the optical lens, YR61Denotes the perpendicular distance, Y, of the inflection point on the object-side surface of the sixth lens element from the optical axisR72Denotes a vertical distance of an inflection point on an image-side surface of the seventh lens element from the optical axis, specifically YR61、YR72Can be seen in fig. 15. Optical lens all is provided with the point of inflection on the object side of sixth lens and the image side of seventh lens, satisfies conditional expression (10) and (11), can rationally set up the position of the point of inflection on the object side of sixth lens and the image side of seventh lens, helps strengthening the coma of off-axis visual field and corrects, and fine convergence field curvature promotes the imaging quality simultaneously.
In some embodiments, the optical lens satisfies the following conditional expression:
1< (R61+R62)/(R61-R62)<25；（12）
where R61 denotes a radius of curvature of the object-side surface of the sixth lens, and R62 denotes a radius of curvature of the image-side surface of the sixth lens. The conditional expression (12) is satisfied, the shape change of the sixth lens can be slowed down by reasonably adjusting the surface shape of the sixth lens at the position of the paraxial region, the generation of stray light is reduced, and the manufacturability of the lens is effectively improved.
In some embodiments, the optical lens satisfies the following conditional expression:
0.1<(CT6+CT7)/TTL<0.2；（13）
0.9<CT6/CT7<1.2；（14）
wherein CT6 denotes a central thickness of the sixth lens on the optical axis, CT7 denotes a central thickness of the seventh lens on the optical axis, and TTL denotes an optical total length of the optical lens. Satisfy conditional expressions (13) and (14), through the central thickness of reasonable setting sixth lens and seventh lens to avoid the sixth lens too thin and cause the lens to mould the fat material and fill inequality when the shaping easily, or seventh lens thickness is too thick leads to the lens to cooperate interference and lens cone interference in the equipment process, influences the imaging effect.
In some embodiments, an image side surface of the third lens in the optical lens is convex. In other embodiments, the image-side surface of the third lens in the optical lens is concave. The third lens adopts different surface types to match and combine, and the system can realize good imaging effect.
As an implementation mode, a glass-plastic mixed matching structure of one glass aspheric lens and six plastic aspheric lenses is adopted, so that the advantages of large aperture, low sensitivity, adjustability of AA (advanced acrylic) process grouping, high yield and the like are realized, the ultrahigh pixel of the lens can be ensured, and the ultrahigh-definition imaging can be realized by matching with a 50M/108M imaging chip. The first lens is made of a glass aspheric surface material, and the geometric chromatic aberration of the optical system is effectively corrected through the characteristic of low dispersion of glass. 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 a high-cost-performance optical performance product is provided.
The invention is further illustrated below in the following examples. In various embodiments, the thickness, the curvature radius, and the material selection of each lens in the optical lens are different, and the specific differences can be referred to in the parameter tables of the various embodiments. The following examples are only preferred embodiments of the present invention, but the embodiments of the present invention are not limited only by the following examples, and any other changes, substitutions, combinations or simplifications which do not depart from the innovative points of the present invention should be construed as being equivalent substitutions and shall be included within the scope of the present invention.
In the embodiments of the present invention, when the lenses in the optical lens are aspheric lenses, the aspheric surface types of the lenses all satisfy the following equation:
Figure 22148DEST_PATH_IMAGE001
；
wherein z is the distance rise from the aspheric surface vertex when the aspheric surface is at the position with the height h along the optical axis direction, c is the paraxial curvature of the surface, k is the quadric coefficient, A2iIs the aspheric surface type coefficient of 2i order.
First embodiment
Referring to fig. 1, a schematic structural diagram of an optical lens 100 according to a first embodiment of the present invention is shown, where the optical lens 100 sequentially includes, from an object side to an image plane along an optical axis: the stop ST, the first lens L1, the second lens L2, the third lens L3, the fourth lens L4, the fifth lens L5, the sixth lens L6, the seventh lens L7, and the filter G1.
The first lens L1 has positive refractive power, the object-side surface S1 of the first lens is convex, and the image-side surface S2 of the first lens is concave;
the second lens L2 has negative power, with the object-side surface S3 of the second lens being convex at the paraxial region and the image-side surface S4 of the second lens being concave at the paraxial region;
the third lens L3 has positive optical power, with an object-side surface S5 of the third lens being convex at the paraxial region and an image-side surface S6 of the third lens being convex at the paraxial region;
the fourth lens L4 has a negative power, with an object-side surface S7 of the fourth lens being convex at the paraxial region and an image-side surface S8 of the fourth lens being concave at the paraxial region;
the fifth lens L5 has positive refractive power, and the object-side surface S9 of the fifth lens is concave, and the image-side surface S10 of the fifth lens is convex;
the sixth lens element L6 has negative optical power, the object-side surface S11 of the sixth lens element is convex at the paraxial region, the image-side surface S12 of the sixth lens element is concave at the paraxial region, and the object-side surface S11 and the image-side surface S12 of the sixth lens element have an inflection point;
the seventh lens L7 has negative power, the object-side surface S13 of the seventh lens is concave at the paraxial region, the image-side surface S14 of the seventh lens is concave at the paraxial region, and the image-side surface S14 of the seventh lens has an inflection point;
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, and the first lens L1 is a glass aspheric lens.
Specifically, the design parameters of each lens of the optical lens 100 provided in this embodiment are shown in table 1.
TABLE 1
Figure 110189DEST_PATH_IMAGE002
In this embodiment, aspheric parameters of each lens in the optical lens 100 are shown in table 2.
TABLE 2
Figure 642802DEST_PATH_IMAGE003
Referring to fig. 2, fig. 3 and fig. 4, a f-tan θ distortion curve, a paraxial curvature of field curve and a vertical chromatic aberration curve of the optical lens 100 are respectively shown. It can be seen from fig. 2 that the optical distortion is controlled within 2%, which indicates that the distortion of the optical lens 100 is well corrected; it can be seen from fig. 3 that the curvature of field is controlled within ± 0.07mm, which indicates that the curvature of field of the optical lens 100 is better corrected; it can be seen from fig. 4 that the vertical axis chromatic aberration at different wavelengths is controlled within ± 2 microns, which indicates that the vertical axis chromatic aberration of the optical lens 100 is well corrected; as can be seen from fig. 2, 3, and 4, the aberrations of the optical lens 100 are well balanced, and the optical imaging quality is good.
Second embodiment
As shown in fig. 5, which is a schematic structural diagram of the optical lens 200 according to the present embodiment, the optical lens 200 according to the present embodiment is substantially the same as the first embodiment, and mainly differs in the curvature radius, aspheric coefficient, and thickness of each lens surface.
Specifically, the design parameters of the optical lens 200 provided in this embodiment are shown in table 3.
TABLE 3
Figure 107281DEST_PATH_IMAGE004
In this embodiment, aspheric parameters of each lens in the optical lens 200 are shown in table 4.
TABLE 4
Figure 41739DEST_PATH_IMAGE005
Referring to fig. 6, 7 and 8, which are graphs of f-tan θ distortion, paraxial curvature of field, and paraxial chromatic aberration of the optical lens 200, respectively, it can be seen from fig. 6 that the optical distortion is controlled within 2%, which indicates that the distortion of the optical lens 200 is well corrected; it can be seen from fig. 7 that the curvature of field is controlled within ± 0.1mm, which indicates that the curvature of field of the optical lens 200 is better corrected; it can be seen from fig. 8 that the vertical chromatic aberration at different wavelengths is controlled within ± 1.2 microns, which indicates that the vertical chromatic aberration of the optical lens 200 is well corrected; as can be seen from fig. 6, 7, and 8, the aberrations of the optical lens 200 are well balanced, and the optical imaging quality is good.
Third embodiment
As shown in fig. 9, which is a schematic structural diagram of an optical lens 300 according to the present embodiment, the optical lens 300 according to the present embodiment is substantially the same as the first embodiment, except that: the image-side surface S6 of the third lens element of the optical lens assembly 300 in this embodiment is concave at the paraxial region, and the curvature radius, aspheric coefficient, and thickness of each lens surface type are different.
Specifically, the design parameters of the optical lens 300 provided in this embodiment are shown in table 5.
TABLE 5
Figure 51415DEST_PATH_IMAGE006
In the present embodiment, aspheric parameters of each lens in the optical lens 300 are shown in table 6.
TABLE 6
Figure 71323DEST_PATH_IMAGE007
Referring to fig. 10, fig. 11 and fig. 12, which are graphs of f-tan θ distortion, paraxial curvature of field and vertical axis chromatic aberration of the optical lens 300, respectively, it can be seen from fig. 10 that the optical distortion is controlled within 2%, which shows that the distortion of the optical lens 300 is well corrected; it can be seen from fig. 11 that the paraxial curvature of field is controlled within ± 0.13mm, which indicates that the curvature of field of the optical lens 300 is better corrected; it can be seen from fig. 12 that the vertical axis chromatic aberration at different wavelengths is controlled within ± 1 micron, which indicates that the vertical axis chromatic aberration of the optical lens 300 is well corrected; as can be seen from fig. 10, 11, and 12, the aberrations of the optical lens 300 are well balanced, and the optical imaging quality is good.
Please refer to table 7, which shows the optical characteristics corresponding to the optical lens provided in the above three embodiments, including the field angle 2 θ, the total optical length TTL, the actual half height IH, the focal length F, the F # and the related values corresponding to each of the aforementioned conditional expressions.
TABLE 7
Figure 73914DEST_PATH_IMAGE008
As can be seen from the distortion curve, the field curve and the vertical axis chromatic aberration curve of the foregoing embodiments, the lens provided by the embodiments of the present invention has the advantages of high pixel, miniaturization, low sensitivity, and the like, and has good resolution.
Compared with the prior art, the glass-plastic mixed optical lens provided by the invention at least has the following advantages:
(1) the thickness of the lens can be effectively reduced. Because the glass has better light transmission and higher refractive index, the optical lens provided by the invention adopts 1 glass lens and 6 plastic lenses, can basically accord with the optical quality of the current mainstream 8 plastic lenses, has more excellent light transmittance and optical performance, and realizes the balance of high pixel and miniaturization of the lens.
(2) The assembly yield of the lens is effectively improved, and the production cost is reduced. Generally, the more lenses are, the higher the assembly precision requirement is, the yield rate is reduced; compared with 8 plastic lenses, the quantity of the lenses to be assembled is reduced by one, the one-time assembly yield can be improved to about 40% from 10-20%, and the glass-plastic hybrid lens adopts a split type optical machine design and adopts an AA (advanced) process grouping focusing process, so that the assembly yield and the imaging quality of the lens are effectively improved.
(3) Can realize the optimization of more coating films. At present, a high-temperature process is mostly adopted for plastic lens coating, the possibility of deformation of the plastic lens is higher under the process, the yield is lower, and the coating does not exceed 5 layers; and the glass lens has stronger high temperature resistance, can realize more layers of coating films for controlling reflection and dazzling light, and further improves the optical imaging quality.
In summary, the optical lens provided by the embodiment of the invention adopts seven glass-plastic mixed lenses with specific focal power, and through reasonably matching the lens shapes, materials and focal power combinations among the lenses, the total length of the optical lens is effectively shortened, meanwhile, the aberration of the optical lens is corrected, and then through controlling the gap between the first lens and the second lens, the optical lens meets the requirement of adjustable AA process grouping, and the imaging quality and the process yield of the lens are greatly improved.
Fourth embodiment
Referring to fig. 16, an imaging device 400 according to a fourth embodiment of the present invention is shown, where the imaging device 400 may include an imaging element 410 and an optical lens (e.g., the optical lens 100) in any of the embodiments described above. The imaging element 410 may be a CMOS (Complementary Metal Oxide Semiconductor) image sensor, and may also be a CCD (Charge Coupled Device) image sensor.
The imaging device 400 may be a mobile phone, a tablet, a camera, or any other electronic device with the optical lens mounted thereon.
The imaging device 400 provided by the embodiment of the application includes the optical lens 100, and since the optical lens 100 has the advantages of large aperture, large imaging target surface, high pixel, adjustability for AA process grouping, and high yield, the imaging device 400 having the optical lens 100 also has the advantages of large aperture, large imaging target surface, high pixel, adjustability for AA process grouping, and high yield.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (12)

1. An optical lens assembly, comprising seven lens elements in order from an object side to an image plane along an optical axis:
a diaphragm;
the lens comprises a first lens with positive focal power, a second lens and a third lens, wherein the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface;
a second lens having a negative optical power, an object-side surface of the second lens being convex at a paraxial region and an image-side surface of the second lens being concave at a paraxial region;
a third lens having positive optical power, an object side surface of the third lens being convex at a paraxial region;
a fourth lens having a negative optical power, an object-side surface of the fourth lens being convex at a paraxial region and an image-side surface of the fourth lens being concave at a paraxial region;
the lens comprises a fifth lens with positive focal power, wherein the object side surface of the fifth lens is a concave surface, and the image side surface of the fifth lens is a convex surface;
a sixth lens having a negative optical power, an object side surface of the sixth lens being convex at a paraxial region and having at least one inflection point, an image side surface of the sixth lens being concave at a paraxial region and having at least one inflection point;
a seventh lens having a 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 and having at least one inflection point;
the second lens, the third lens, the fourth lens, the fifth lens, the sixth lens and the seventh lens are all plastic aspheric lenses, and the first lens is a glass aspheric lens;
the optical lens satisfies the following conditional expression:
0.02<AC1/TTL<0.12；
0.04<ET1/TTL<0.12；
wherein AC1 denotes an air gap on an optical axis between the first lens and the second lens, ET1 denotes an edge thickness of the first lens, and TTL denotes an optical total length of the optical lens.
2. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
-1.2mm<(Nd1/Vd1)*f2<-0.3mm；
wherein Nd1 represents a material refractive index of the first lens, Vd1 represents a material Abbe number of the first lens, and f2 represents a focal length of the second lens.
3. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
1.65<f/EPD<1.9；
where f denotes a focal length of the optical lens, and EPD denotes an entrance pupil diameter of the optical lens.
4. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
IH>5.2mm；
0.4<EPD/IH<0.8；
wherein EPD represents the entrance pupil diameter of the optical lens, and IH represents the actual half-image height of the optical lens.
5. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
1<f12/f<1.6；
wherein f12 denotes a combined focal length of the first lens and the second lens, and f denotes a focal length of the optical lens.
6. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
0mm<IH-f×tan(θ)<0.15mm；
where θ represents a half field angle of the optical lens, IH represents an actual half image height of the optical lens, and f represents a focal length of the optical lens.
7. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
3.0<EPD/BFL<3.8；
wherein EPD represents an entrance pupil diameter of the optical lens, and BFL represents a back focal length of the optical lens.
8. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
0.03<YR61/IH<0.33；
0.2<YR72/IH<0.3；
wherein, YR61Denotes a vertical distance, Y, of an inflection point on an object-side surface of the sixth lens element from an optical axisR72And IH represents the actual half image height of the optical lens.
9. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
1<(R61+R62)/(R61-R62)<25；
wherein R61 denotes a radius of curvature of an object-side surface of the sixth lens, and R62 denotes a radius of curvature of an image-side surface of the sixth lens.
10. An optical lens according to claim 1, characterized in that the optical lens satisfies the following conditional expression:
0.1<(CT6+CT7)/TTL<0.2；
0.9<CT6/CT7<1.2；
wherein CT6 denotes a central thickness of the sixth lens element on the optical axis, CT7 denotes a central thickness of the seventh lens element on the optical axis, and TTL denotes a total optical length of the optical lens system.
11. An optical lens barrel according to claim 1, wherein the image side surface of the third lens element is convex or concave.
12. An imaging apparatus comprising the optical lens according to any one of claims 1 to 11 and an imaging element for converting an optical image formed by the optical lens into an electric signal.
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CN115268034B (en) * 2022-08-04 2024-07-19 东莞晶彩光学有限公司 Seven-piece type short-focus optical lens
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