CN112882201A - Optical lens - Google Patents
Optical lens Download PDFInfo
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- CN112882201A CN112882201A CN202110232390.5A CN202110232390A CN112882201A CN 112882201 A CN112882201 A CN 112882201A CN 202110232390 A CN202110232390 A CN 202110232390A CN 112882201 A CN112882201 A CN 112882201A
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- lens
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- image
- lens element
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- 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
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
Abstract
The invention discloses an optical lens, which comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens which are arranged in sequence from an object side to an image side, wherein the first lens has negative focal power, the object side surface is a convex surface, the image side surface is a concave surface, the second lens has negative focal power, the object side surface is a concave surface, the image side surface is a convex surface, the third lens has positive focal power, the fourth lens has negative focal power, the fifth lens has positive focal power, the object side surface and the image side surface are convex surfaces, the sixth lens has positive focal power, the object side surface and the image side surface are convex surfaces, the seventh lens has negative focal power, the object side surface and the image side surface are concave surfaces, the eighth lens has positive focal power, the object side surface is a convex surface, the image side surface is a concave surface, and the optical lens meets the following conditions: 0.9< f/ENPD < 1.0. The optical lens provided by the invention has the F number of 1.0, and ensures sufficient picture brightness.
Description
Technical Field
The invention relates to the technical field of optical system design, in particular to an optical lens.
Background
With the development of scientific technology, security monitoring products and application markets are gradually changed, and monitoring needs to be performed 24 hours all day in places with poor monitoring conditions and dark light, so that the optical lens is required to have excellent imaging quality in complex light environments of various environments, but most of the existing lenses cannot meet enough picture brightness, and the effect is poor when the optical lens is used at night or in dark environments.
Disclosure of Invention
The invention mainly aims to provide an optical lens, aiming at solving the problem that the brightness of most lens pictures is insufficient.
In order to achieve the above object, an optical lens according to the present invention includes an object side and an image side opposite to each other along an optical axis, and the optical lens includes a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, and an eighth lens, which are sequentially disposed from the object side to the image side;
the first lens has negative focal power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface;
the second lens has negative focal power, the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a convex surface;
the third lens has positive optical power;
the fourth lens has a negative optical power;
the fifth lens has positive focal power, and both the object-side surface and the image-side surface of the fifth lens are convex surfaces;
the sixth lens has positive focal power, and both the object-side surface and the image-side surface of the sixth lens are convex surfaces;
the seventh lens has negative focal power, and both the object side surface and the image side surface of the seventh lens are concave surfaces;
the eighth lens has positive focal power, the object side surface of the eighth lens is a convex surface, and the image side surface of the eighth lens is a concave surface;
wherein the optical lens satisfies the following conditions: 0.9< f/ENPD < 1.0;
wherein f is an effective focal length of the optical lens, and ENPD is an entrance pupil diameter of the optical lens.
Optionally, the optical lens further includes a diaphragm, and the diaphragm is located between the third lens and the fourth lens.
Optionally, the optical lens satisfies the following condition: -2.5< f1/f < -1.8;
-11<f2/f<-9；
2.9<f3/f<3.6；
-3<f4/f<-4；
1.5<f5/f<2.2；
1.8<f6/f<2.3；
-1.5<f7/f<-0.9；
1.2<f8/f<1.7；
wherein f1 is the effective focal length of the first lens element, f2 is the effective focal length of the second lens element, f3 is the effective focal length of the third lens element, f4 is the effective focal length of the fourth lens element, f5 is the effective focal length of the fifth lens element, f6 is the effective focal length of the sixth lens element, f7 is the effective focal length of the seventh lens element, and f8 is the effective focal length of the eighth lens element.
Optionally, the first lens, the second lens, the sixth lens, the seventh lens, and the eighth lens are all made of plastic materials, and the third lens, the fourth lens, and the fifth lens are all made of glass materials.
Optionally, the first lens, the second lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens, and the eighth lens are aspheric lenses, and the third lens is a spherical lens.
Optionally, the optical lens satisfies the following condition: 0.72<Nd9,10/Nd6,7<0.78；
0.85<Nd13,14/Nd11,12<0.9；
Wherein, Nd6,7Is the refractive index of the third lens, Nd9,10Being said fourth lensRefractive index, Nd11,12Is a refractive index of the fifth lens, Nd13,14Is the refractive index of the sixth lens.
Optionally, the optical lens satisfies the following condition: -1.7< Cur3/Cur4< -1.5;
wherein Cur3 is the central curvature of the image side surface of the first lens, and Cur4 is the central curvature of the object side surface of the second lens.
Optionally, the optical lens satisfies the following condition: 0.61<Sag15/T15,16<0.65；
Among them, Sag15The distance, T, from the center of the object side lens of the seventh lens element to the maximum effective diameter parallel to the optical axis15,16The distance between the object side surface of the seventh lens and the image side surface of the seventh lens on the optical axis is shown.
Optionally, the optical lens satisfies the following condition: 1.5< TH/f < 2.0;
and TH is the image plane diameter of the optical lens.
Optionally, the optical lens satisfies the following condition: 0.9< D7/TH < 1;
wherein D7 is an optical effective diameter of the seventh lens, and TH is an image plane diameter of the optical lens.
In the technical scheme of the invention, the first lens is set to have negative focal power, the object side surface and the image side surface of the first lens are set to be convex and concave, the second lens is set to have negative focal power, the object side surface and the image side surface of the second lens are set to be concave and convex, the third lens is set to have positive focal power, the fourth lens is set to have negative focal power, the fifth lens is set to have positive focal power, the object side surface and the image side surface of the fifth lens are both set to be convex, the sixth lens is set to have positive focal power, the object side surface and the image side surface of the sixth lens are both set to be convex, the seventh lens is set to have negative focal power, the object side surface and the image side surface of the seventh lens are both set to be concave, the eighth lens is set to have positive focal power, and the object side surface of the eighth lens is set to be convex, The image side surface is set to be a concave surface, so that the optical lens meets the condition that F/ENPD is less than 1.0 by 0.9, the F number reaches 1.0, and further sufficient picture brightness is met.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of an optical lens according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of a diffuse spot of an image point of the optical lens of FIG. 1;
FIG. 3 is a schematic diagram of an MTF curve of the optical lens of FIG. 1;
fig. 4 is a schematic diagram of an astigmatism curve of the optical lens in fig. 1.
The reference numbers illustrate:
| reference numerals | Name (R) | Reference numerals | Name (R) |
| 100 | Optical lens | 5 | |
| 1 | First lens | 6 | Sixth lens element |
| 2 | Second lens | 7 | |
| 3 | Third lens | 8 | Eighth lens element |
| 4 | Fourth lens |
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, and back … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative positional relationship between the components, the movement situation, and the like in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, the meaning of "and/or" appearing throughout includes three juxtapositions, exemplified by "A and/or B" including either A or B or both A and B. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
With the development of scientific technology, security monitoring products and application markets are gradually changed, and monitoring needs to be performed 24 hours all day in places with poor monitoring conditions and dark light, so that the optical lens is required to have excellent imaging quality in complex light environments of various environments, but most of the existing lenses cannot meet enough picture brightness, and the effect is poor when the optical lens is used at night or in dark environments.
In view of this, the present invention provides an optical lens, which can achieve an F-number of the lens of 1.0 by changing the focal power and the surface shape of a plurality of lenses, thereby solving the problem of insufficient brightness of the image. Fig. 1 to 4 show an embodiment of an optical lens provided in the present invention.
Referring to fig. 1, an optical lens 100 has an object side and an image side which are opposite to each other along an optical axis direction, the optical lens 100 includes a first lens element 1, a second lens element 2, a third lens element 3, a fourth lens element 4, a fifth lens element 5, a sixth lens element 6, a seventh lens element 7 and an eighth lens element 8 which are sequentially disposed from the object side to the image side, the first lens element 1 has a negative focal power, an object side surface of the first lens element 1 is a convex surface, an image side surface of the first lens element 1 is a concave surface, the second lens element 2 has a negative focal power, an object side surface of the second lens element 2 is a concave surface, an image side surface of the second lens element 2 is a convex surface, the third lens element 3 has a positive focal power, the fourth lens element 4 has a negative focal power, the fifth lens element 5 has a positive focal power, both the object side surface and the image side surface of the fifth lens element 5 are convex surfaces, and the sixth lens element 6 has a positive focal power, the object-side surface and the image-side surface of the sixth lens element 6 are both convex surfaces, the seventh lens element 7 has negative focal power, the object-side surface and the image-side surface of the seventh lens element 7 are both concave surfaces, the eighth lens element 8 has positive focal power, the object-side surface of the eighth lens element 8 is a convex surface, the image-side surface of the eighth lens element 8 is a concave surface, and the optical lens system 100 satisfies the following conditions: 0.9< f/ENPD <1.0, f being the effective focal length of the optical lens 100, ENPD being the entrance pupil diameter of the optical lens 100.
In the technical solution of the present invention, by setting the first lens element 1 to a negative focal power, setting the object-side surface and the image-side surface of the first lens element 1 to a convex surface and a concave surface, setting the second lens element 2 to a negative focal power, setting the object-side surface and the image-side surface of the second lens element 2 to a concave surface and a convex surface, setting the third lens element 3 to a positive focal power, setting the fourth lens element 4 to a negative focal power, setting the fifth lens element 5 to a positive focal power, setting both the object-side surface and the image-side surface of the fifth lens element 5 to a convex surface, setting the sixth lens element 6 to a positive focal power, setting both the object-side surface and the image-side surface of the sixth lens element 6 to a convex surface, setting the seventh lens element 7 to a negative focal power, setting both the object-side surface and the image-side surface of the seventh lens element 7 to a concave surface, and setting the eighth lens element 8 to a positive focal power, the object-side surface and the image-side surface of the eighth lens element 8 are convex and concave, so that the optical lens 100 satisfies 0.9< F/ENPD <1.0, and the F number reaches 1.0, thereby satisfying sufficient image brightness.
In addition, the optical lens 100 further includes a diaphragm (not shown in the figure), which is located between the third lens 3 and the fourth lens 4, so that the total length of the lens is effectively shortened, and meanwhile, the vignetting is reasonably used to realize high-aperture high resolution.
In the above embodiment, the optical lens 100 satisfies the following conditions: -2.5< f1/f < -1.8, -11< f2/f < -9, 2.9< f3/f <3.6, -3< f4/f < -4, 1.5< f5/f <2.2, 1.8< f6/f <2.3, -1.5< f7/f < -0.9, 1.2< f8/f <1.7, f1 is the effective focal length of the first lens 1, f2 is the effective focal length of the second lens 2, f3 is the effective focal length of the third lens 3, f4 is the effective focal length of the fourth lens 4, f5 is the effective focal length of the fifth lens 5, f6 is the effective focal length of the sixth lens 6, f7 is the effective focal length of the seventh lens 7, f8 is the effective focal length of the eighth lens 8, reasonably the effective focal lengths of the lenses are allocated to one another, the entire lens diameter is increased, and the high color reduction degree can be ensured, and a good imaging effect can be obtained even in an environment with weak illumination.
In the above embodiment, the first lens element 1, the second lens element 2, the sixth lens element 6, the seventh lens element 7, and the eighth lens element 8 are all made of plastic material, the third lens element 3, the fourth lens element 4, and the fifth lens element 5 are all made of glass material, and the glass lens elements and the plastic lens elements are matched with each other, so that low cost is achieved, and the image resolving capability of the lens is improved.
Further, the first lens 1, the second lens 2, the fourth lens 4, the fifth lens 5, the sixth lens 6, the seventh lens 7, and the eighth lens 8 are all aspheric lenses, and the third lens 3 is a spherical lens, so that the total length of the lens is greatly shortened due to the use of the aspheric lenses.
In the above embodiment, the optical lens 100 satisfies the following conditions: 0.72<Nd9,10/Nd6,7<0.78，0.85<Nd13,14/Nd11,12<0.9，Nd6,7Is a refractive index of the third lens 3, Nd9,10Is a refractive index of the fourth lens 4, Nd11,12Is a refractive index of the fifth lens 5, Nd13,14For the refractive index of the sixth lens element 6, the height of the light rays is effectively controlled under the condition that the diameter of the entrance pupil is increased, the incident angle is ensured within a certain range, and the miniaturization of the lens is facilitated.
In the above embodiment, the optical lens 100 satisfies the following conditions: 1.7< Cur3/Cur4< -1.5 >, Cur3 is the central curvature of the image side surface of the first lens 1, and Cur4 is the central curvature of the object side surface of the second lens 2, so that the lens shape is controlled within a certain range, the occurrence of serious ghost images is avoided, the light rays are prevented from turning at a large angle, the tolerance sensitivity is reduced, the processing difficulty is reduced, and the production yield is improved.
Furthermore, the optical lens 100 satisfies the following conditions: 0.61<Sag15/T15,16<0.65，Sag15Is the distance, T, from the center of the object side lens of the seventh lens element 7 to the maximum effective diameter parallel to the optical axis15,16The distance between the object side surface of the seventh lens element 7 and the image side surface of the seventh lens element 7 on the optical axis is controlled, so that the shape of the surface of the seventh lens element 7 is controlled within a reasonable range, the light is prevented from turning at a large angle, tolerance sensitivity is reduced, processing difficulty is reduced, production yield is improved, and serious ghost images can be prevented.
In order to ensure that the lens has a larger visual field and further monitors a larger range, the optical lens 100 satisfies the following conditions: 1.5< TH/f <2.0, and TH is the image plane diameter of the optical lens 100.
In the above embodiment, the optical lens 100 satisfies the following conditions: 0.9< D7/TH <1, D7 is the optical effective diameter of the seventh lens 7, TH is the image plane diameter of the optical lens 100, so that the incident angle of image plane light is ensured within a certain range, the color reducing effect of the image plane is ensured, and the color cast problem is not easy to occur.
It should be noted that the optical lens 100 further includes an infrared filter, the infrared filter is disposed on the side of the eighth lens element 8 close to the image side, and the infrared filter has a characteristic of filtering infrared light, which is helpful for preventing the infrared light from reaching the image sensor and causing interference on normal visible light imaging, so as to improve imaging quality.
In this embodiment, the parameters of the optical lens 100 are shown in table 1 below, and the coefficients of the aspheric surfaces are shown in tables 2 and 3 below.
TABLE 1 parameters of the respective lenses
TABLE 2 Cone coefficients, second to eighth order aspherical coefficients of the aspherical lenses
| Surface of | k | A2 | A4 | A6 | A8 |
| 2 | -4.63E+00 | 0.00E+00 | -3.18E-03 | 1.41E-04 | -4.11E-06 |
| 3 | -4.35E-01 | 0.00E+00 | -4.99E-03 | 5.37E-05 | -1.86E-05 |
| 4 | -1.48E+00 | 0.00E+00 | 1.94E-03 | -2.27E-04 | -1.64E-05 |
| 5 | -5.39E-01 | 0.00E+00 | 2.86E-03 | -2.01E-04 | 4.33E-07 |
| 9 | -2.74E+02 | 0.00E+00 | -1.16E-03 | 2.14E-05 | -1.20E-05 |
| 10 | -5.54E+00 | 0.00E+00 | -1.43E-03 | 3.09E-05 | -2.07E-05 |
| 11 | -6.40E+01 | 0.00E+00 | 1.68E-03 | -2.94E-04 | 1.04E-05 |
| 12 | -1.44E+01 | 0.00E+00 | -3.04E-03 | 1.93E-04 | -1.02E-05 |
| 13 | -1.38E+00 | 0.00E+00 | 1.59E-04 | -4.52E-05 | 1.06E-05 |
| 14 | -4.34E+01 | 0.00E+00 | -2.71E-03 | -2.71E-04 | 3.51E-05 |
| 15 | -9.16E+00 | 0.00E+00 | 1.55E-03 | -4.26E-04 | 2.20E-05 |
| 16 | -1.32E+02 | 0.00E+00 | 4.26E-03 | 7.87E-05 | -1.41E-05 |
| 17 | -8.99E+00 | 0.00E+00 | 2.03E-03 | -6.30E-05 | 2.01E-05 |
| 18 | -9.95E+39 | 0.00E+00 | 1.27E-03 | -1.50E-04 | 2.98E-05 |
TABLE 3 Ten to sixteen order aspherical surface coefficients of each aspherical lens
| Surface of | A10 | A12 | A14 | A16 |
| 2 | 9.35E-08 | -1.06E-09 | 0.00E+00 | 0.00E+00 |
| 3 | 7.77E-07 | -5.76E-08 | 0.00E+00 | 0.00E+00 |
| 4 | 2.28E-06 | -5.79E-08 | 0.00E+00 | 0.00E+00 |
| 5 | 7.92E-07 | -2.54E-08 | 0.00E+00 | 0.00E+00 |
| 9 | 1.56E-06 | -6.52E-08 | 0.00E+00 | 0.00E+00 |
| 10 | 2.09E-06 | -4.86E-08 | 0.00E+00 | 0.00E+00 |
| 11 | 8.11E-08 | 0.00E+00 | 0.00E+00 | 0.00E+00 |
| 12 | 1.90E-07 | 0.00E+00 | 0.00E+00 | 0.00E+00 |
| 13 | -2.30E-07 | -6.76E-08 | 4.68E-09 | -8.56E-11 |
| 14 | -1.03E-06 | 2.44E-10 | -2.51E-11 | 6.12E-13 |
| 15 | 4.97E-07 | -7.22E-08 | 2.78E-09 | -7.39E-11 |
| 16 | 1.15E-06 | -8.12E-08 | 1.04E-09 | 2.04E-11 |
| 17 | -9.60E-08 | -4.56E-08 | -2.82E-10 | 1.72E-10 |
| 18 | -7.48E-07 | -3.41E-11 | -8.49E-10 | 4.29E-10 |
For example, the surface 2 of the first lens 1 is an object side surface, the surface 3 is an image side surface, E-01 represents a power of-1 of 10, E-02 represents a power of-2 of 10, and so on, E-N represents a power of-N of 10, E +01 represents a power of +1 of 10, E +02 represents a power of +2 of 10, and so on, E + N represents a power of + N of 10, k is a conic coefficient, a2, a4, a6, A8, a10, a12, a14, and a16 are second-order, fourth-order, sixth-order, eighth-order, tenth-order, twelfth-order, fourteen-order, and sixty-order aspheric coefficients.
Please refer to fig. 2, in this embodiment, fig. 2 is a schematic diagram of a speckle pattern of an imaging point of the optical lens 100, in which a central RMS SPOT point is below 3um, below GEO 7um, and RMS SPOT points within 0.8F can be controlled below 4um, RMS is 16um, an RMS SPOT point of a maximum image plane is below 10um, and below GEO 47um, so as to ensure that the overall image plane is relatively clear and does not generate blur.
Please refer to fig. 3, in the present embodiment, fig. 3 is a schematic MTF curve diagram of the optical lens 100, in which a central MTF 100lp/mm is greater than 0.6, and MTF 100lp/mm within 08F is greater than 0.4, so as to ensure that the overall resolution of the image plane is better.
Please refer to fig. 4, in the present embodiment, fig. 4 is a schematic diagram of an astigmatism curve of the optical lens 100, in which axial chromatic aberration, a difference between centers of pupils of the bands 435 and 656 is within 0.015mm, and a difference between centers of pupils of 1.0pupil is within 0.035 mm.
In the embodiment, eight lenses are used as an example, and the focal power, the surface type and the material of each lens and the position of the diaphragm 9 are reasonably distributed, so that the optical lens 100 has the characteristics of large aperture, sufficient image brightness, miniaturization, high resolution, low cost, high resolution, large field of view and high production yield.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (10)
1. An optical lens is characterized in that the optical lens is provided with an object side and an image side which are oppositely arranged along an optical axis direction, and the optical lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens and an eighth lens which are sequentially arranged from the object side to the image side;
the first lens has negative focal power, the object side surface of the first lens is a convex surface, and the image side surface of the first lens is a concave surface;
the second lens has negative focal power, the object side surface of the second lens is a concave surface, and the image side surface of the second lens is a convex surface;
the third lens has positive optical power;
the fourth lens has a negative optical power;
the fifth lens has positive focal power, and both the object-side surface and the image-side surface of the fifth lens are convex surfaces;
the sixth lens has positive focal power, and both the object-side surface and the image-side surface of the sixth lens are convex surfaces;
the seventh lens has negative focal power, and both the object side surface and the image side surface of the seventh lens are concave surfaces;
the eighth lens has positive focal power, the object side surface of the eighth lens is a convex surface, and the image side surface of the eighth lens is a concave surface;
wherein the optical lens satisfies the following conditions: 0.9< f/ENPD < 1.0;
wherein f is an effective focal length of the optical lens, and ENPD is an entrance pupil diameter of the optical lens.
2. An optical lens as recited in claim 1, further comprising an optical stop located between the third lens and the fourth lens.
3. An optical lens according to claim 1, wherein the optical lens satisfies the following condition: -2.5< f1/f < -1.8;
-11<f2/f<-9；
2.9<f3/f<3.6；
-3<f4/f<-4；
1.5<f5/f<2.2；
1.8<f6/f<2.3；
-1.5<f7/f<-0.9；
1.2<f8/f<1.7；
wherein f1 is the effective focal length of the first lens element, f2 is the effective focal length of the second lens element, f3 is the effective focal length of the third lens element, f4 is the effective focal length of the fourth lens element, f5 is the effective focal length of the fifth lens element, f6 is the effective focal length of the sixth lens element, f7 is the effective focal length of the seventh lens element, and f8 is the effective focal length of the eighth lens element.
4. An optical lens barrel according to claim 1, wherein the first lens element, the second lens element, the sixth lens element, the seventh lens element and the eighth lens element are all made of plastic material, and the third lens element, the fourth lens element and the fifth lens element are all made of glass material.
5. An optical lens barrel according to claim 4, wherein the first lens, the second lens, the fourth lens, the fifth lens, the sixth lens, the seventh lens and the eighth lens are aspheric lenses, and the third lens is a spherical lens.
6. An optical lens according to claim 1, wherein the optical lens satisfies the following condition: 0.72<Nd9,10/Nd6,7<0.78；
0.85<Nd13,14/Nd11,12<0.9；
Wherein, Nd6,7Is the refractive index of the third lens, Nd9,10Is a refractive index of the fourth lens, Nd11,12Is a refractive index of the fifth lens, Nd13,14Is the refractive index of the sixth lens.
7. An optical lens according to claim 1, wherein the optical lens satisfies the following condition: -1.7< Cur3/Cur4< -1.5;
wherein Cur3 is the central curvature of the image side surface of the first lens, and Cur4 is the central curvature of the object side surface of the second lens.
8. An optical lens according to claim 1, wherein the optical lens satisfies the following condition: 0.61<Sag15/T15,16<0.65；
Among them, Sag15The distance, T, from the center of the object side lens of the seventh lens element to the maximum effective diameter parallel to the optical axis15,16The distance between the object side surface of the seventh lens and the image side surface of the seventh lens on the optical axis is shown.
9. An optical lens according to claim 1, wherein the optical lens satisfies the following condition: 1.5< TH/f < 2.0;
and TH is the image plane diameter of the optical lens.
10. An optical lens according to claim 1, wherein the optical lens satisfies the following condition: 0.9< D7/TH < 1;
wherein D7 is an optical effective diameter of the seventh lens, and TH is an image plane diameter of the optical lens.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114839748A (en) * | 2022-07-04 | 2022-08-02 | 江西晶超光学有限公司 | Optical system, image capturing module and terminal |
| CN117075313A (en) * | 2023-10-18 | 2023-11-17 | 江西联益光学有限公司 | optical lens |
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2021
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114839748A (en) * | 2022-07-04 | 2022-08-02 | 江西晶超光学有限公司 | Optical system, image capturing module and terminal |
| CN117075313A (en) * | 2023-10-18 | 2023-11-17 | 江西联益光学有限公司 | optical lens |
| CN117075313B (en) * | 2023-10-18 | 2024-02-20 | 江西联益光学有限公司 | Optical lens |
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