CN110568594A - optical imaging lens - Google Patents
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- CN110568594A CN110568594A CN201910981602.2A CN201910981602A CN110568594A CN 110568594 A CN110568594 A CN 110568594A CN 201910981602 A CN201910981602 A CN 201910981602A CN 110568594 A CN110568594 A CN 110568594A
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- 238000012634 optical imaging Methods 0.000 title claims abstract description 47
- 230000003287 optical effect Effects 0.000 claims abstract description 30
- 239000006185 dispersion Substances 0.000 claims description 13
- 238000003384 imaging method Methods 0.000 claims description 12
- 235000005811 Viola adunca Nutrition 0.000 abstract description 7
- 240000009038 Viola odorata Species 0.000 abstract description 7
- 235000013487 Viola odorata Nutrition 0.000 abstract description 7
- 235000002254 Viola papilionacea Nutrition 0.000 abstract description 7
- 238000010586 diagram Methods 0.000 description 15
- 230000004075 alteration Effects 0.000 description 10
- 230000002349 favourable effect Effects 0.000 description 6
- 239000006059 cover glass Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 238000012544 monitoring process Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- 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
- G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
- G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
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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
- G02B13/008—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras designed for infrared light
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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
- G02B13/14—Optical objectives specially designed for the purposes specified below for use with infrared or ultraviolet radiation
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Abstract
the invention relates to the technical field of lenses, in particular to an optical imaging lens. The invention discloses an optical imaging lens, which sequentially comprises a first lens, a second lens, a third lens, a diaphragm, a fourth lens and an eighth lens from an object side to an image side along an optical axis; the first lens is a convex-concave lens with negative refractive index; the second lens is a concave lens with negative refractive index; the third lens element with positive refractive index and convex object-side surface; the fourth lens is a concave lens with negative refractive index; the fifth lens is a convex lens with positive refractive index; the sixth lens is a convex lens with positive refractive index; the seventh lens is a concave-convex lens with negative refractive index; the eighth lens is a convex-concave lens with positive refractive index; the second lens and the third lens are mutually glued, the fourth lens and the fifth lens are mutually glued, and the sixth lens and the seventh lens are mutually glued. The invention has the advantages of large image surface, good image quality, small infrared defocusing, unobvious blue-violet edge phenomenon and short total length.
Description
Technical Field
The invention belongs to the technical field of lenses, and particularly relates to an optical imaging lens.
Background
With the continuous progress of the technology, in recent years, the optical imaging lens is also rapidly developed and widely applied to various fields such as smart phones, tablet computers, video conferences, vehicle-mounted monitoring, security monitoring and the like, so that the requirement on the optical imaging lens is higher and higher. For the optical imaging lens applied to the fields of security monitoring and the like, the optical imaging lens needs to be shared day and night, so that the infrared confocal performance is required to be better, but the existing optical imaging lens with better infrared confocal performance has serious blue-purple edge phenomenon because more wavelengths need to be considered; in order to optimize image quality, the number of lenses is large, so that the total optical length is long, and the image plane is generally small due to high image quality requirements, so that the requirements which are increasingly improved cannot be met.
Disclosure of Invention
The present invention is directed to an optical imaging lens to solve the above problems.
in order to achieve the purpose, the invention adopts the technical scheme that: an optical imaging lens sequentially comprises a first lens, a second lens, a third lens, a diaphragm, a fourth lens and an eighth lens from an object side to an image side along an optical axis; the first lens element to the eighth lens element each include an object-side surface facing the object side and allowing the imaging light to pass therethrough and an image-side surface facing the image side and allowing the imaging light to pass therethrough;
The first lens element with negative refractive index has a convex object-side surface and a concave image-side surface;
The second lens element with negative refractive index has a concave object-side surface and a concave image-side surface;
The third lens element with positive refractive index has a convex object-side surface; the image side surface of the second lens and the object side surface of the third lens are mutually cemented;
The fourth lens element with negative refractive index has a concave object-side surface and a concave image-side surface;
The fifth lens element with positive refractive index has a convex object-side surface and a convex image-side surface; the image side surface of the fourth lens and the object side surface of the fifth lens are mutually cemented;
The sixth lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
The seventh lens element with negative refractive index has a concave object-side surface and a convex image-side surface; the image side surface of the sixth lens and the object side surface of the seventh lens are mutually cemented;
the eighth lens element with positive refractive index has a convex object-side surface and a concave image-side surface;
The optical imaging lens has only eight lenses with refractive indexes.
Further, the image side surface of the third lens is a plane.
Furthermore, the diaphragm bears directly against the third lens.
Further, the optical imaging lens further satisfies: f23>0mm, vd2> vd3, wherein f23 is the combined focal length of the second lens and the third lens, and vd2 and vd3 are the dispersion coefficients of the second lens and the third lens in the d line respectively.
Further, the optical imaging lens further satisfies: 60< vd2<65, 30< vd3<35, vd2-vd3>30, wherein vd2 and vd3 are the d-line abbe numbers of the second lens and the third lens, respectively.
further, the optical imaging lens further satisfies: f45<0mm, vd5> vd4, wherein f45 is the combined focal length of the fourth lens and the fifth lens, and vd4 and vd5 are the d-line abbe numbers of the fourth lens and the fifth lens respectively.
Further, the optical imaging lens further satisfies: 20< vd4<26, 60< vd5<80, vd5-vd4>40, wherein vd4 and vd5 are the d-line abbe numbers of the fourth lens and the fifth lens, respectively.
further, the optical imaging lens further satisfies: f67>0mm, vd6> vd7, wherein f67 is the combined focal length of the sixth lens and the seventh lens, and vd6 and vd7 are the dispersion coefficients of the sixth lens and the seventh lens in the d line respectively.
Further, the optical imaging lens further satisfies: 45< vd6<55, 25< vd7<35, where vd6 and vd7 are the d-line abbe numbers of the sixth lens and the seventh lens, respectively.
Further, the sum of the core thicknesses of the second lens and the third lens is less than 2.5mm, the sum of the core thicknesses of the fourth lens and the fifth lens is less than 2.9mm, and the sum of the core thicknesses of the sixth lens and the seventh lens is less than 3 mm.
The invention has the beneficial technical effects that:
The invention adopts eight lenses, and through correspondingly designing each lens, the infrared confocal lens has good infrared confocal property (infrared defocusing can be less than 10 mu m), and the blue-violet edge phenomenon is not obvious; under the condition of ensuring the image quality, the total optical length is small (can be less than 21mm), the image surface is large, and the use of 1/2.5' sensor can be met; and the relative illumination is higher (can be more than 50%), and the light passing is larger (the aperture value FNO is 1.9).
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural diagram according to a first embodiment of the present invention;
FIG. 2 is a graph of MTF of 0.435-0.656 μm in visible light according to the first embodiment of the present invention;
FIG. 3 is a defocus graph of 0.435-0.656 μm in visible light according to the first embodiment of the present invention;
FIG. 4 is a defocus graph of 850nm infrared light at 60lp/mm in accordance with the first embodiment of the present invention;
FIG. 5 is a diagram illustrating longitudinal aberrations according to a first embodiment of the present invention;
FIG. 6 is a diagram illustrating curvature of field and distortion according to a first embodiment of the present invention;
FIG. 7 is a 546nm relative luminance graph according to a first embodiment of the present invention;
FIG. 8 is a schematic structural diagram according to a second embodiment of the present invention;
FIG. 9 is a graph of MTF of 0.435-0.656 μm in visible light according to example II of the present invention;
FIG. 10 is a defocus graph of 0.435-0.656 μm in visible light according to the second embodiment of the present invention;
FIG. 11 is a defocus graph of 60lp/mm at 850nm in the second embodiment of the present invention;
FIG. 12 is a diagram illustrating longitudinal aberrations in accordance with a second embodiment of the present invention;
FIG. 13 is a diagram illustrating curvature of field and distortion according to a second embodiment of the present invention;
FIG. 14 is a comparative plot at 546nm for example two of the present invention;
FIG. 15 is a schematic structural diagram of a third embodiment of the present invention;
FIG. 16 is a graph of MTF of 0.435-0.656 μm in visible light according to example III of the present invention;
FIG. 17 is a defocus graph of 0.435-0.656 μm in visible light according to the third embodiment of the present invention;
FIG. 18 is a defocus graph of 60lp/mm at infrared 850nm for the third embodiment of the present invention;
FIG. 19 is a schematic diagram of longitudinal aberration of the third embodiment of the present invention;
FIG. 20 is a diagram illustrating curvature of field and distortion according to a third embodiment of the present invention;
FIG. 21 is a 546nm contrast plot of example three of the present invention;
FIG. 22 is a schematic structural diagram according to a fourth embodiment of the present invention;
FIG. 23 is a graph of MTF of 0.435-0.656 μm in visible light according to example four of the present invention;
FIG. 24 is a defocus graph of 0.435-0.656 μm in visible light according to example four of the present invention;
FIG. 25 is a defocus graph of 60lp/mm at infrared 850nm for the fourth embodiment of the present invention;
FIG. 26 is a diagram illustrating longitudinal aberrations in accordance with a fourth embodiment of the present invention;
FIG. 27 is a graph showing curvature of field and distortion according to a fourth embodiment of the present invention;
FIG. 28 is a comparative plot at 546nm for example four of the present invention;
Detailed Description
To further illustrate the various embodiments, the invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. Those skilled in the art will appreciate still other possible embodiments and advantages of the present invention with reference to these figures. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.
The invention will now be further described with reference to the accompanying drawings and detailed description.
the term "a lens element having positive refractive index (or negative refractive index)" means that the paraxial refractive index of the lens element calculated by Gaussian optics theory is positive (or negative). The term "object-side (or image-side) of a lens" is defined as the specific range of imaging light rays passing through the lens surface. The determination of the surface shape of the lens can be performed by the judgment method of a person skilled in the art, i.e., by the sign of the curvature radius (abbreviated as R value). The R value may be commonly used in optical design software, such as Zemax or CodeV. The R value is also commonly found in lens data sheets (lens data sheets) of optical design software. When the R value is positive, the object side is judged to be a convex surface; and when the R value is negative, judging that the object side surface is a concave surface. On the contrary, regarding the image side surface, when the R value is positive, the image side surface is judged to be a concave surface; when the R value is negative, the image side surface is judged to be convex.
The invention discloses an optical imaging lens, which sequentially comprises a first lens, a second lens, a third lens, a diaphragm, a fourth lens and an eighth lens from an object side to an image side along an optical axis; the first lens element to the eighth lens element each include an object-side surface facing the object side and passing the image light, and an image-side surface facing the image side and passing the image light.
the first lens element with negative refractive index has a convex object-side surface and a concave image-side surface; the second lens element with negative refractive index has a concave object-side surface and a concave image-side surface; the third lens element with positive refractive index has a convex object-side surface; the fourth lens element with negative refractive index has a concave object-side surface and a concave image-side surface; the fifth lens element with positive refractive index has a convex object-side surface and a convex image-side surface; the sixth lens element with positive refractive index has a convex object-side surface and a convex image-side surface; the seventh lens element with negative refractive index has a concave object-side surface and a convex image-side surface; the eighth lens element with positive refractive power has a convex object-side surface and a concave image-side surface.
The image side surface of the second lens and the object side surface of the third lens are mutually cemented; the image side surface of the fourth lens and the object side surface of the fifth lens are mutually cemented; the image side surface of the sixth lens and the object side surface of the seventh lens are mutually cemented; the three groups of cemented lenses are used in combination, thereby effectively eliminating chromatic aberration of infrared and purple light bands, and avoiding purple fringing phenomenon on the premise of better visible and infrared confocal effects.
The optical imaging lens has only eight lenses with refractive indexes. The invention adopts eight lenses, and through correspondingly designing each lens, the infrared confocal lens has good infrared confocal property and unobvious blue-violet edge phenomenon; under the condition of ensuring the image quality, the total optical length is small, the image surface is large, and the use of 1/2.5' sensor can be met; and the relative illumination is higher, leads to the great advantage of light.
Preferably, the image side surface of the third lens is a plane, and the manufacturability is better.
More preferably, the diaphragm bears directly on the third lens, so that the interval change caused by tolerance in the diaphragm manufacturing process can be well controlled, and the influence of the interval change on the field curvature generated by the imaging of the optical imaging lens is reduced.
Preferably, the optical imaging lens further satisfies: f23>0mm, vd2> vd3, wherein f23 is the combined focal length of the second lens and the third lens, and vd2 and vd3 are the dispersion coefficients of the second lens and the third lens in the d line respectively, which is favorable for achromatization.
More preferably, the optical imaging lens further satisfies: 60< vd2<65, 30< vd3<35, vd2-vd3>30, wherein vd2 and vd3 are the dispersion coefficients of the second lens and the third lens, respectively, in the d line, which is favorable for further achromatization.
Preferably, the optical imaging lens further satisfies: f45<0mm, vd5> vd4, wherein f45 is the combined focal length of the fourth lens and the fifth lens, and vd4 and vd5 are the dispersion coefficients of the fourth lens and the fifth lens in the d line respectively, which is favorable for achromatization.
More preferably, the optical imaging lens further satisfies: 20< vd4<26, 60< vd5<80, vd5-vd4>40, wherein vd4 and vd5 are the d-line dispersion coefficients of the fourth lens and the fifth lens, respectively, which is favorable for further achromatization.
The two groups of cemented lenses were used in combination to further achromatize.
Preferably, the optical imaging lens further satisfies: f67>0mm, vd6> vd7, wherein f67 is the combined focal length of the sixth lens and the seventh lens, and vd6 and vd7 are the dispersion coefficients of the sixth lens and the seventh lens in the d line respectively, which is favorable for achromatization.
More preferably, the optical imaging lens further satisfies: 45< vd6<55, 25< vd7<35, where vd6 and vd7 are the d-line abbe numbers of the sixth lens and the seventh lens, respectively, which is favorable for further achromatization.
Preferably, the sum of the core thicknesses of the second lens and the third lens is less than 2.5mm, the sum of the core thicknesses of the fourth lens and the fifth lens is less than 2.9mm, and the sum of the core thicknesses of the sixth lens and the seventh lens is less than 3mm, so that the lens structure is compact, and the optical total length of the optical imaging lens is compressed to a certain extent.
the optical imaging lens of the present invention will be described in detail below with specific embodiments.
Implement one
as shown in fig. 1, an optical imaging lens includes, in order along an optical axis I from an object side a1 to an image side a2, a first lens element 1, a second lens element 2, a third lens element 3, a stop (not shown), a fourth lens element 4, a fifth lens element 5, a sixth lens element 6, a seventh lens element 7, an eighth lens element 8, a protective glass 9, and an image plane 100; the first lens element 1 to the eighth lens element 8 each include an object-side surface facing the object side a1 and passing the imaging light and an image-side surface facing the image side a2 and passing the imaging light.
The first lens element 1 has a negative refractive index, the object-side surface 11 of the first lens element 1 is convex, and the image-side surface 12 of the first lens element 1 is concave.
The second lens element 2 has a negative refractive index, and an object-side surface 21 of the second lens element 2 is concave and an image-side surface 22 of the second lens element 2 is concave.
The third lens element 3 has a positive refractive index, the object-side surface 31 of the third lens element 3 is convex, and the image-side surface 32 of the third lens element 3 is planar, although in other embodiments, the image-side surface 32 of the third lens element 3 can be convex or concave. The image-side surface 22 of the second lens 2 and the object-side surface 31 of the third lens 3 are cemented to each other.
The fourth lens element 4 has a negative refractive index, and an object-side surface 41 of the fourth lens element 4 is concave and an image-side surface 42 of the fourth lens element 4 is concave.
The fifth lens element 5 with positive refractive index has a convex object-side surface 51 of the fifth lens element 5 and a convex image-side surface 52 of the fifth lens element 5; the image-side surface 42 of the fourth lens element 4 and the object-side surface 51 of the fifth lens element 5 are cemented to each other.
The sixth lens element 6 with positive refractive index has a convex object-side surface 61 of the sixth lens element 6 and a convex image-side surface 62 of the sixth lens element 6.
The seventh lens element 7 with negative refractive index has a concave object-side surface 71 of the seventh lens element 7 and a convex image-side surface 72 of the seventh lens element 7; the image-side surface 62 of the sixth lens element 6 and the object-side surface 71 of the seventh lens element 7 are cemented to each other.
The eighth lens element 8 has a positive refractive index, and an object-side surface 81 of the eighth lens element 8 is convex and an image-side surface 82 of the eighth lens element 8 is concave.
In this embodiment, the diaphragm directly bears against the third lens 3, but not limited thereto.
In the present embodiment, the sum of the core thicknesses of the second lens 2 and the third lens 3 is 2.14mm, the sum of the core thicknesses of the fourth lens 4 and the fifth lens 5 is 2.46mm, and the sum of the core thicknesses of the sixth lens 6 and the seventh lens 7 is 2.53 mm.
In the present embodiment of the present invention,
the detailed optical data of this embodiment are shown in Table 1-1.
Table 1-1 detailed optical data for example one
| Surface of | Caliber (mm) | radius of curvature (mm) | thickness (mm) | Material of | refractive index | coefficient of dispersion | focal length (mm) | |
| - | Shot object surface | Infinity | Infinity | |||||
| 11 | First lens | 8.000 | 7.937 | 1.020 | H-KF6 | 1.52 | 52.19 | -10.52 |
| 12 | 4.637 | 3.095 | 1.243 | |||||
| 21 | second lens | 4.531 | -68.231 | 0.600 | H-K9L | 1.52 | 64.21 | -7.00 |
| 22 | 4.800 | 3.848 | 0 | |||||
| 31 | Third lens | 4.800 | 3.848 | 1.540 | TAFD25 | 1.90 | 31.32 | 4.23 |
| 32 | 4.800 | Infinity | 0.000 | |||||
| - | Diaphragm | 3.631 | Infinity | 1.745 | ||||
| 41 | fourth lens | 3.609 | -5.202 | 0.600 | FD60-W | 1.81 | 25.46 | -3.70 |
| 42 | 5.000 | 7.488 | 0 | |||||
| 51 | Fifth lens element | 5.000 | 7.488 | 1.860 | FCD515 | 1.59 | 68.62 | 5.11 |
| 52 | 5.000 | -4.636 | 0.099 | |||||
| 61 | sixth lens element | 6.600 | 14.469 | 1.730 | H-ZLAF50E | 1.80 | 46.57 | 7.18 |
| 62 | 6.600 | -9.178 | 0 | |||||
| 71 | Seventh lens element | 6.600 | -9.178 | 0.800 | H-ZF10 | 1.69 | 31.16 | -28.14 |
| 72 | 8.000 | -17.933 | 1.817 | |||||
| 81 | Eighth lens element | 8.000 | 14.005 | 2.350 | H-LAF50B | 1.77 | 49.61 | 31.48 |
| 82 | 8.000 | 30.404 | 0.300 | |||||
| 9 | cover glass | 6.966 | Infinity | 0.700 | H-K9L | 1.52 | 64.21 | Infinity |
| - | 6.993 | Infinity | 4.199 | |||||
| 100 | Image plane | 7.233 | Infinity | 0.000 |
referring to fig. 2, the MTF curve of the present embodiment shows that the transfer function is higher and the resolution is higher; as shown in fig. 3 and 4, the confocal property between visible light and infrared light is good, and the infrared offset is less than 10 μm; please refer to fig. 5, it can be seen that the blue-violet chromatic aberration is well controlled, the field curvature and distortion diagram are shown in (a) and (B) of fig. 6, it can be seen that the distortion is small, and the imaging quality is high; referring to fig. 7, it can be seen that the relative illuminance is large, greater than 50%.
In this specific embodiment, f23 is 10.6mm, f45 is-41.9 mm, f67 is 9.7mm, the focal length f of the optical imaging lens is 6.17mm, the aperture value FNO is 1.9, the field angle FOV is 69 °, and the optical back focus is 5.2 mm; the image plane size Φ is 7.2mm, and the distance TTL between the object-side surface 11 of the first lens element 1 and the image plane 10 on the optical axis I is 20.60 mm.
Example two
as shown in fig. 8, in this embodiment, the surface convexoconcave and the refractive index of each lens are the same as those of the first embodiment, and only the optical parameters such as the curvature radius of the surface of each lens and the thickness of the lens are different.
The detailed optical data of this embodiment is shown in Table 2-1.
TABLE 2-1 detailed optical data for example two
| Surface of | Caliber (mm) | Radius of curvature (mm) | thickness (mm) | Material of | Refractive index | Coefficient of dispersion | Focal length (mm) | |
| - | Shot object surface | Infinity | Infinity | |||||
| 11 | First lens | 8.000 | 7.793 | 0.900 | H-KF6 | 1.52 | 52.19 | -10.58 |
| 12 | 4.623 | 3.098 | 1.215 | |||||
| 21 | Second lens | 4.531 | -70.125 | 0.600 | H-K9L | 1.52 | 64.21 | -7.01 |
| 22 | 4.800 | 3.848 | 0 | |||||
| 31 | third lens | 4.800 | 3.848 | 1.540 | TAFD25 | 1.90 | 31.32 | 4.23 |
| 32 | 4.800 | Infinity | 0.000 | |||||
| - | Diaphragm | 3.626 | Infinity | 1.734 | ||||
| 41 | Fourth lens | 3.601 | -5.220 | 0.600 | H-ZF7LA | 1.81 | 25.48 | -3.68 |
| 42 | 5.000 | 7.369 | 0 | |||||
| 51 | Fifth lens element | 5.000 | 7.369 | 1.860 | FCD515 | 1.59 | 68.62 | 5.13 |
| 52 | 5.000 | -4.716 | 0.098 | |||||
| 61 | Sixth lens element | 6.600 | 15.559 | 1.730 | H-ZLAF50E | 1.80 | 46.57 | 7.00 |
| 62 | 6.600 | -8.447 | 0 | |||||
| 71 | Seventh lens element | 6.600 | -8.447 | 0.710 | H-ZF10 | 1.69 | 31.16 | -27.47 |
| 72 | 8.000 | -15.688 | 1.374 | |||||
| 81 | Eighth lens element | 8.000 | 16.156 | 3.080 | H-LAF50B | 1.77 | 49.61 | 34.92 |
| 82 | 8.000 | 36.669 | 0.300 | |||||
| 9 | Cover glass | 6.835 | Infinity | 0.700 | H-K9L | 1.52 | 64.21 | Infinity |
| - | 6.876 | Infinity | 4.159 | |||||
| 100 | Image plane | 7.246 | Infinity | 0.000 |
in the present embodiment, the sum of the core thicknesses of the second lens 2 and the third lens 3 is 1.94mm, the sum of the core thicknesses of the fourth lens 4 and the fifth lens 5 is 2.46mm, and the sum of the core thicknesses of the sixth lens 6 and the seventh lens 7 is 2.44 mm.
Referring to fig. 9, the MTF curve of the present embodiment can be seen as having a higher transfer function and a higher resolution; as shown in fig. 10 and 11, the confocal property between visible light and infrared light is good, and the infrared offset is less than 10 μm; please refer to fig. 12, it can be seen that the blue-violet chromatic aberration is well controlled, the field curvature and distortion diagram are shown in (a) and (B) of fig. 13, it can be seen that the distortion is small, and the imaging quality is high; referring to fig. 14, it can be seen that the relative illuminance is large, greater than 50%.
In this specific embodiment, f23 is 10.56mm, f45 is-37.5 mm, f67 is 9.47mm, the focal length f of the optical imaging lens is 6.15mm, the aperture value FNO is 1.9, the field angle FOV is 69 °, and the optical back focus is 5.16 mm; the image plane size Φ is 7.2mm, and the distance TTL between the object-side surface 11 of the first lens element 1 and the image plane 10 on the optical axis I is 20.60 mm.
EXAMPLE III
As shown in fig. 15, in this embodiment, the surface convexoconcave and the refractive index of each lens are the same as those of the first embodiment, and only the optical parameters such as the curvature radius of the surface of each lens and the thickness of the lens are different.
The detailed optical data of this embodiment is shown in Table 3-1.
TABLE 3-1 detailed optical data for EXAMPLE III
| Surface of | Caliber (mm) | Radius of curvature (mm) | Thickness (mm) | material of | Refractive index | Coefficient of dispersion | Focal length (mm) | |
| - | shot object surface | Infinity | Infinity | |||||
| 11 | first lens | 5.336 | 6.260 | 0.600 | H-QK3L | 1.49 | 70.42 | -14.18 |
| 12 | 4.332 | 3.187 | 1.240 | |||||
| 21 | Second lens | 4.135 | -27.593 | 0.600 | H-K9L | 1.52 | 64.21 | -6.09 |
| 22 | 4.181 | 3.597 | 0 | |||||
| 31 | Third lens | 4.181 | 3.597 | 1.230 | H-ZLAF75A | 1.90 | 31.32 | 3.95 |
| 32 | 3.757 | Infinity | 0.298 | |||||
| - | Diaphragm | 3.412 | Infinity | 1.070 | ||||
| 41 | Fourth lens | 3.444 | -4.818 | 1.119 | H-ZF7LA | 1.81 | 25.48 | -3.22 |
| 42 | 5.000 | 6.336 | 0 | |||||
| 51 | Fifth lens element | 5.000 | 6.336 | 1.704 | FCD515 | 1.59 | 68.62 | 5.00 |
| 52 | 5.000 | -5.041 | 0.100 | |||||
| 61 | sixth lens element | 6.015 | 15.667 | 2.005 | H-ZLAF68B | 1.88 | 40.81 | 5.47 |
| 62 | 6.347 | -6.622 | 0 | |||||
| 71 | Seventh lens element | 6.347 | -6.622 | 0.600 | H-ZF2 | 1.67 | 32.18 | -10.92 |
| 72 | 6.723 | -65.060 | 1.320 | |||||
| 81 | Eighth lens element | 7.526 | 13.413 | 3.675 | H-LAF50B | 1.77 | 49.61 | 18.88 |
| 82 | 7.400 | 139.359 | 0.300 | |||||
| 9 | Cover glass | 7.393 | Infinity | 0.700 | H-K9L | 1.52 | 64.21 | Infinity |
| - | 7.380 | Infinity | 4.040 | |||||
| 100 | Image plane | 7.269 | Infinity | 0.000 |
in the present embodiment, the sum of the core thicknesses of the second lens 2 and the third lens 3 is 1.83mm, the sum of the core thicknesses of the fourth lens 4 and the fifth lens 5 is 2.823mm, and the sum of the core thicknesses of the sixth lens 6 and the seventh lens 7 is 2.605 mm.
Referring to fig. 16, the MTF curve of the present embodiment shows that the transfer function is higher and the resolution is higher; as shown in fig. 17 and 18, the confocal property between visible light and infrared light is good, and the infrared offset is less than 10 μm; please refer to fig. 19 for illustration of longitudinal aberration, it can be seen that the blue-violet chromatic aberration is well controlled, the field curvature and distortion diagram are as shown in (a) and (B) of fig. 20, it can be seen that the distortion is small, and the imaging quality is high; referring to fig. 21, it can be seen that the relative illuminance is large, greater than 50%.
In this specific embodiment, f23 is 11mm, f45 is-19.8 mm, f67 is 10.41mm, the focal length f of the optical imaging lens is 6.25mm, the f number FNO is 1.9, the field angle FOV is 70 °, and the optical back focus is 5.04 mm; the image plane size Φ is 7.2mm, and the distance TTL between the object-side surface 11 of the first lens element 1 and the image plane 10 on the optical axis I is 20.60 mm.
Example four
As shown in fig. 22, in this embodiment, the surface convexoconcave and the refractive index of each lens are the same as those of the first embodiment, and only the optical parameters such as the curvature radius of the surface of each lens and the thickness of the lens are different.
The detailed optical data of this embodiment is shown in Table 4-1.
TABLE 4-1 detailed optical data for example four
| Surface of | Caliber (mm) | Radius of curvature (mm) | Thickness (mm) | material of | Refractive index | Coefficient of dispersion | Focal length (mm) | |
| - | shot object surface | Infinity | Infinity | |||||
| 11 | first lens | 8.000 | 8.146 | 1.061 | H-KF6 | 1.52 | 52.19 | -10.34 |
| 12 | 4.510 | 3.095 | 1.124 | |||||
| 21 | Second lens | 4.426 | -72.013 | 0.600 | H-K9L | 1.52 | 64.21 | -6.61 |
| 22 | ||||||||
| 31 | Third lens | 3.990 | 3.611 | 1.625 | TAFD25 | 1.90 | 31.32 | 3.97 |
| 32 | 3.458 | Infinity | -0.013 | |||||
| - | Diaphragm | 3.459 | Infinity | 1.575 | ||||
| 41 | Fourth lens | 3.407 | -4.779 | 0.599 | H-ZF7LA | 1.81 | 25.48 | -3.47 |
| 42 | ||||||||
| 51 | fifth lens element | 3.854 | 7.286 | 1.793 | FCD515 | 1.59 | 68.62 | 5.03 |
| 52 | 4.374 | -4.611 | 0.098 | |||||
| 61 | Sixth lens element | 5.417 | 15.745 | 1.580 | H-ZLAF50E | 1.80 | 46.57 | 6.99 |
| 62 | ||||||||
| 71 | seventh lens element | 5.744 | -8.409 | 0.718 | H-ZF10 | 1.69 | 31.16 | -25.48 |
| 72 | 6.093 | -16.593 | 1.889 | |||||
| 81 | Eighth lens element | 7.045 | 14.971 | 2.922 | H-LAF50B | 1.77 | 49.61 | 23.80 |
| 82 | 7.002 | 72.187 | 0.300 | |||||
| 9 | Cover glass | 7.012 | Infinity | 0.700 | H-K9L | 1.52 | 64.21 | Infinity |
| - | 7.033 | Infinity | 4.080 | |||||
| 100 | Image plane | 7.225 | Infinity | 0.000 |
In the present embodiment, the sum of the core thicknesses of the second lens 2 and the third lens 3 is 2.225mm, the sum of the core thicknesses of the fourth lens 4 and the fifth lens 5 is 2.392mm, and the sum of the core thicknesses of the sixth lens 6 and the seventh lens 7 is 2.298 mm.
Referring to fig. 23, the MTF curve of the present embodiment shows that the transfer function is higher and the resolution is higher; as shown in fig. 24 and 25, the visible light and infrared confocal property is good, and the infrared offset is less than 10 μm; please refer to fig. 26, it can be seen that the blue-violet chromatic aberration is well controlled, the field curvature and distortion diagram are shown in (a) and (B) of fig. 27, it can be seen that the distortion is small, and the imaging quality is high; referring to fig. 28, it can be seen that the relative illuminance is large, greater than 50%.
In this embodiment, f23 is 9.84mm, f45 is-27.69 mm, f67 is 9.7mm, the focal length f of the optical imaging lens is 6.17mm, the aperture value FNO is 1.9, the field angle FOV is 69 °, and the optical back focus is 5.08 mm; the image plane size Φ is 7.2mm, and the distance TTL between the object-side surface 11 of the first lens element 1 and the image plane 10 on the optical axis I is 20.65 mm.
While the invention has been particularly shown and described with reference to a preferred embodiment, it will be understood by those skilled in the art that various changes in form and detail may be made therein without departing from the spirit and scope of the invention as defined by the appended claims.
Claims (10)
1. An optical imaging lens characterized in that: the lens comprises a first lens, a second lens, a third lens, a diaphragm, a fourth lens and an eighth lens in sequence from an object side to an image side along an optical axis; the first lens element to the eighth lens element each include an object-side surface facing the object side and allowing the imaging light to pass therethrough and an image-side surface facing the image side and allowing the imaging light to pass therethrough;
The first lens element with negative refractive index has a convex object-side surface and a concave image-side surface;
The second lens element with negative refractive index has a concave object-side surface and a concave image-side surface;
The third lens element with positive refractive index has a convex object-side surface; the image side surface of the second lens and the object side surface of the third lens are mutually cemented;
The fourth lens element with negative refractive index has a concave object-side surface and a concave image-side surface;
The fifth lens element with positive refractive index has a convex object-side surface and a convex image-side surface; the image side surface of the fourth lens and the object side surface of the fifth lens are mutually cemented;
The sixth lens element with positive refractive index has a convex object-side surface and a convex image-side surface;
The seventh lens element with negative refractive index has a concave object-side surface and a convex image-side surface; the image side surface of the sixth lens and the object side surface of the seventh lens are mutually cemented;
the eighth lens element with positive refractive index has a convex object-side surface and a concave image-side surface;
the optical imaging lens has only eight lenses with refractive indexes.
2. The optical imaging lens according to claim 1, characterized in that: the image side surface of the third lens is a plane.
3. The optical imaging lens according to claim 2, characterized in that: the diaphragm bears directly against the third lens.
4. the optical imaging lens of claim 1, further satisfying: f23>0mm, vd2> vd3, wherein f23 is the combined focal length of the second lens and the third lens, and vd2 and vd3 are the dispersion coefficients of the second lens and the third lens in the d line respectively.
5. The optical imaging lens of claim 4, further satisfying: 60< vd2<65, 30< vd3<35, vd2-vd3>30, wherein vd2 and vd3 are the d-line abbe numbers of the second lens and the third lens, respectively.
6. the optical imaging lens of claim 1, further satisfying: f45<0mm, vd5> vd4, wherein f45 is the combined focal length of the fourth lens and the fifth lens, and vd4 and vd5 are the d-line abbe numbers of the fourth lens and the fifth lens respectively.
7. the optical imaging lens of claim 6, further satisfying: 20< vd4<26, 60< vd5<80, vd5-vd4>40, wherein vd4 and vd5 are the d-line abbe numbers of the fourth lens and the fifth lens, respectively.
8. The optical imaging lens of claim 1, further satisfying: f67>0mm, vd6> vd7, wherein f67 is the combined focal length of the sixth lens and the seventh lens, and vd6 and vd7 are the dispersion coefficients of the sixth lens and the seventh lens in the d line respectively.
9. The optical imaging lens according to claim 8, characterized in that: the optical imaging lens further satisfies: 45< vd6<55, 25< vd7<35, where vd6 and vd7 are the d-line abbe numbers of the sixth lens and the seventh lens, respectively.
10. The optical imaging lens according to claim 1, characterized in that: the sum of the core thicknesses of the second lens and the third lens is less than 2.5mm, the sum of the core thicknesses of the fourth lens and the fifth lens is less than 2.9mm, and the sum of the core thicknesses of the sixth lens and the seventh lens is less than 3 mm.
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