CN111751962A - Small-size optical imaging lens who leads to light greatly - Google Patents
Small-size optical imaging lens who leads to light greatly Download PDFInfo
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- CN111751962A CN111751962A CN202010786094.5A CN202010786094A CN111751962A CN 111751962 A CN111751962 A CN 111751962A CN 202010786094 A CN202010786094 A CN 202010786094A CN 111751962 A CN111751962 A CN 111751962A
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- G—PHYSICS
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- 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
- G02B13/0015—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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Abstract
The invention relates to the technical field of lenses. The invention discloses a small-sized large-light-transmission optical imaging lens which sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens from an object side to an image side along an optical axis; the first lens element, the second lens element and the sixth lens element are all convex-concave lenses with negative refractive index, the third lens element has positive refractive index, and the object side surface is a convex surface; the fourth lens element is a meniscus lens element with positive refractive index, the fifth lens element is a convex lens element with positive refractive index, and both the object-side surface and the image-side surface of the third lens element are aspheric surfaces or both the object-side surface and the image-side surface of the fourth lens element are aspheric surfaces. The invention has the advantages of high resolution, small distortion, good imaging quality, large relative aperture, uniform relative illumination and miniaturization.
Description
Technical Field
The invention belongs to the technical field of lenses, and particularly relates to a small optical imaging lens with large light transmission.
Background
With the continuous progress of scientific technology and the continuous development of society, in recent years, optical imaging lenses are also rapidly developed, and the optical imaging lenses are widely applied to various fields such as smart phones, tablet computers, video conferences, vehicle-mounted monitoring, security monitoring, 3D scanning and the like, so that the requirements on the optical imaging lenses are increasingly improved.
In a system that performs 3D scanning using TOF (time of flight) technology, the performance of the TOF lens is critical, and the effect and reliability of 3D scanning are greatly affected. However, TOF lenses in the current market have many disadvantages, such as small relative aperture, and not reaching the ideal relative aperture required by the application; the whole size is large, the total length is long, and the miniaturization requirement cannot be met; the distortion control is poor, and a large amount of pixel loss is caused by distortion correction; the sacrifice of the relative illumination of the edge view field is large for realizing the large relative aperture; the transfer function is not well controlled, the resolution is low, the imaging quality is poor, and the like, so that the increasingly improved requirements in the field of 3D scanning cannot be met, and the improvement is urgently needed.
Disclosure of Invention
The invention aims to provide a small-sized optical imaging lens with large light transmission to solve the technical problems.
In order to achieve the purpose, the invention adopts the technical scheme that: a small-sized large-light-transmission optical imaging lens sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens and a fourth lens from an object side to an image side along an optical axis; the first lens, the second lens, the third lens and the fourth lens are respectively arranged on the object side and the image side, and the object side faces towards the object side and enables the imaging light rays to pass through;
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 convex object-side surface and a concave image-side surface;
the third lens element has positive refractive index, and the object-side surface of the third lens element is convex;
the fourth lens element with positive refractive index has a concave object-side surface and a convex 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 negative refractive index has a convex object-side surface and a concave image-side surface;
the object side surface and the image side surface of the third lens are both aspheric surfaces, or the object side surface and the image side surface of the fourth lens are both aspheric surfaces;
the optical imaging lens has only the first lens element to the sixth lens element with refractive index.
Further, the lens further comprises a diaphragm, and the diaphragm is arranged between the third lens and the fourth lens.
Further, the optical imaging lens further satisfies: nd3 is more than or equal to 1.85, wherein nd3 is the refractive index of the third lens.
Further, the optical imaging lens further satisfies: 2.7< | f1/f | <3.8 and 2.7< | f2/f | <3.8, wherein f1 is the focal length of the first lens, f2 is the focal length of the second lens, and f is the focal length of the optical imaging lens.
Further, the optical imaging lens further satisfies: vd2 is more than or equal to 38, wherein vd2 is the abbe number of the second lens.
Further, the optical imaging lens further satisfies: nd5>1.8, where nd5 is the refractive index of the fifth lens.
Further, the optical imaging lens further satisfies: nd1 is more than or equal to 1.51 and less than or equal to nd2, nd4 is more than or equal to 1.68 and less than or equal to nd3 and less than or equal to 2.1, and nd6 is more than or equal to 1.49 and less than or equal to nd5 and less than or equal to 2.1, wherein nd1, nd2, nd3, nd4, nd5 and nd6 are refractive indexes of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens respectively.
Further, the optical imaging lens further satisfies: | phi 3 | is less than or equal to 0.16mm-1，∣Φ4∣≤0.21mm-1，∣Φ5∣≤0.2mm-1，∣Φ6∣≤0.15mm-1And phi 3 is the focal power of the third lens, phi 4 is the focal power of the fourth lens, phi 5 is the focal power of the fifth lens, and phi 6 is the focal power of the sixth lens.
Further, the optical imaging lens further satisfies: ALT <9mm, ALG <7mm, and ALT/ALG <1.5, wherein ALG is a sum of air gaps from the first lens to the image plane on the optical axis, and ALT is a sum of six lens thicknesses from the first lens to the sixth lens on the optical axis.
The invention has the beneficial technical effects that:
the invention adopts six lenses, and by correspondingly designing each lens, the relative aperture is large, and the identification range is enlarged; the whole volume is small, the total length is short, the weight is light, and the requirement of miniaturization can be realized; distortion is well corrected, and the serious condition of pixel loss under the condition of correcting distortion is reduced; the relative illumination is controlled, so that the uniformity of the relative illumination under the condition of large relative aperture is ensured; the optical transfer function has the advantages of better control, high resolution and good imaging quality.
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 at 925nm to 960nm in the first embodiment of the present invention;
FIG. 3 is a graph of relative infrared illumination at 940nm according to a first embodiment of the present invention;
FIG. 4 is a graph of field curvature and distortion according to a first embodiment of the present invention;
FIG. 5 is a schematic structural diagram according to a second embodiment of the present invention;
FIG. 6 is a graph of MTF at 925nm to 960nm in the infrared of example II of the present invention;
FIG. 7 is a graph of the relative illuminance at 940nm in the infrared spectrum according to a second embodiment of the present invention;
FIG. 8 is a graph of field curvature and distortion for a second embodiment of the present invention;
FIG. 9 is a schematic structural diagram of a third embodiment of the present invention;
FIG. 10 is a graph of MTF at 925nm-960nm in the infrared of example III of the present invention;
FIG. 11 is a graph of the relative illuminance at 940nm in the infrared spectrum according to a third embodiment of the present invention;
FIG. 12 is a graph of field curvature and distortion according to a third embodiment of the present invention;
FIG. 13 is a schematic structural diagram according to a fourth embodiment of the present invention;
FIG. 14 is a graph of MTF at 925nm to 960nm in the infrared of example four of the present invention;
FIG. 15 is a graph of relative infrared illumination at 940nm according to a fourth embodiment of the present invention;
fig. 16 is a graph of field curvature and distortion according to a fourth embodiment 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 a small-sized large-light-transmission optical imaging lens which sequentially comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens from an object side to an image side along an optical axis; the first lens element to the sixth 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 convex object-side surface and a concave image-side surface.
The third lens element has a positive refractive index, and the object-side surface of the third lens element is convex.
The fourth lens element with positive refractive power has a concave object-side surface and a convex image-side surface.
The fifth lens element with positive refractive power has a convex object-side surface and a convex image-side surface.
The sixth lens element with negative refractive index has a convex object-side surface and a concave image-side surface.
The object side surface and the image side surface of the third lens are both aspheric surfaces or the object side surface and the image side surface of the fourth lens are both aspheric surfaces, so that high-grade spherical aberration and coma aberration are improved, the relative aperture is improved, the effective diameter of the aspheric surfaces is reduced as much as possible, and the system cost is reduced.
The optical imaging lens has only the first lens element to the sixth lens element with refractive index. The invention adopts six lenses, and by correspondingly designing each lens, the relative aperture is large, and the identification range is enlarged; the whole volume is small, the total length is short, the weight is light, and the requirement of miniaturization can be realized; distortion is well corrected, and the serious condition of pixel loss under the condition of correcting distortion is reduced; the relative illumination is controlled, so that the uniformity of the relative illumination under the condition of large relative aperture is ensured; the optical transfer function has the advantages of better control, high resolution and good imaging quality.
Preferably, the lens further comprises a diaphragm, and the diaphragm is arranged between the third lens and the fourth lens, so that the process difficulty is reduced, and the assembly yield is improved.
More preferably, the optical imaging lens further satisfies: nd3 is more than or equal to 1.85, wherein nd3 is the refractive index of the third lens, and a high-refractive-index material is used in front of the diaphragm, so that the aperture is effectively reduced, the structure is more miniaturized, and the resolution is favorably improved.
Preferably, the optical imaging lens further satisfies: 2.7< | f1/f | <3.8 and 2.7< | f2/f | <3.8, wherein f1 is the focal length of the first lens, f2 is the focal length of the second lens, and f is the focal length of the optical imaging lens, further correcting distortion and improving the lens resolution.
Preferably, the optical imaging lens further satisfies: vd2 is more than or equal to 38, wherein vd2 is the dispersion coefficient of the second lens, the primary aberration is further optimized, and the image quality is improved.
Preferably, the optical imaging lens further satisfies: nd5>1.8, wherein nd5 is the refractive index of the fifth lens, and can effectively reduce the primary aberration.
Preferably, the optical imaging lens further satisfies: nd1 is more than or equal to 1.51 and less than or equal to nd2, nd4 is more than or equal to 1.68 and less than or equal to nd3 and less than or equal to 2.1, and nd5 is more than or equal to 1.49 and less than or equal to nd6 and less than or equal to 2.1, wherein nd1, nd2, nd3, nd4, nd5 and nd6 are refractive indexes of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens respectively, so that aberration caused by a large-aperture optical system can be effectively corrected, the improvement of the integral resolution is facilitated, and the system performance is better improved.
Preferably, the optical imaging lens further satisfies: | phi 3 | is less than or equal to 0.16mm-1，∣Φ4∣≤0.21mm-1，∣Φ5∣≤0.2mm-1，∣Φ6∣≤0.15mm-1And phi 3 is the focal power of the third lens, phi 4 is the focal power of the fourth lens, phi 5 is the focal power of the fifth lens, and phi 6 is the focal power of the sixth lens, so that the sensitivity of the optical imaging lens to each tolerance is reduced, and the production yield of the optical imaging lens is improved.
Preferably, the optical imaging lens further satisfies: ALT <9mm, ALG <7mm, and ALT/ALG <1.5, wherein ALG is the sum of air gaps between the first lens and the imaging surface on the optical axis, and ALT is the sum of the thicknesses of the six lenses between the first lens and the sixth lens on the optical axis, the system length of the optical imaging lens is further shortened, and the optical imaging lens is easy to process and manufacture, and the system configuration is optimized.
The small-sized large-light-transmission optical imaging lens of the present invention will be described in detail with specific embodiments.
Example one
As shown in fig. 1, a small-sized large-light-flux optical imaging lens includes, in order along an optical axis I, a first lens 1, a second lens 2, a third lens 3, a stop 7, a fourth lens 4, a fifth lens 5, a sixth lens 6, a filter 8, and an image plane 9 from an object side a1 to an image side a 2; the first lens element 1 to the sixth lens element 6 each include an object-side surface facing the object side a1 and passing the imaging light rays, and an image-side surface facing the image side a2 and passing the imaging light rays.
The first lens element 1 has a negative refractive index, and an object-side surface 11 of the first lens element 1 is convex and an 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 convex and an image-side surface 22 of the second lens element 2 is concave.
The third lens element 3 has positive refractive power, 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 concave, although in some embodiments, the image-side surface 32 of the third lens element can also be convex or flat.
The fourth lens element 4 has a positive 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 convex.
The fifth lens element 5 has a positive refractive index, and an object-side surface 51 of the fifth lens element 5 is convex and an image-side surface 52 of the fifth lens element 5 is convex.
The sixth lens element 6 has a negative refractive index, and an object-side surface 61 of the sixth lens element 6 is convex and an image-side surface 62 of the sixth lens element 6 is concave.
In this embodiment, both the object-side surface 41 and the image-side surface 42 of the fourth lens element 4 are aspheric, and in some embodiments, both the object-side surface 31 and the image-side surface 32 of the third lens element 3 may also be aspheric.
Of course, in some embodiments, the diaphragm 7 may also be arranged between other lenses.
The detailed optical data of this embodiment are shown in Table 1-1.
Table 1-1 detailed optical data for example one
In this embodiment, the object-side surface 41 and the image-side surface 42 are defined by the following aspheric curve formula:
wherein:
z: the depth of the aspheric surface (the perpendicular distance between a point on the aspheric surface that is y from the optical axis and a tangent plane tangent to the vertex on the aspheric optical axis).
c: the curvature of the aspheric vertex (the vertex curvature).
K: cone coefficient (Conic Constant).
rn: normalized radius (normalysis radius (NRADIUS));
u：r/rn。
am: mth order QconCoefficient (is the m)thQconcoefficient)。
Qm con: mth order QconPolynomial (the m)thQconpolynomial)。
For details of parameters of each aspheric surface, please refer to the following table:
| surface of | 41 | 42 |
| K＝ | -3.22E+01 | -2.42E-01 |
| a4＝ | -1.483E-02 | -7.403E-04 |
| a6＝ | 2.368E-03 | -2.357E-04 |
| a8＝ | -1.512E-03 | -9.847E-05 |
| a10＝ | 2.407E-05 | 1.411E-05 |
| a12＝ | 1.171E-04 | -2.946E-07 |
| a14＝ | -2.183E-05 | -1.841E-07 |
Please refer to table 5 for the values of the conditional expressions related to this embodiment.
The MTF transfer function curve chart of the specific embodiment is shown in detail in FIG. 2, and it can be seen that the resolution is high, the transfer function is still larger than 0.3 at 160lp/mm, the imaging quality is excellent, and the sensor can meet the requirement of more than 100 ten thousand images; referring to fig. 3, it can be seen that the contrast is high and the uniformity is good; curvature of field and distortion referring to (a) and (B) of fig. 4, it can be seen that curvature of field and distortion are better corrected.
In this embodiment, the focal length f of the optical imaging lens is 2.9 mm; the f-number FNO is 1.2; the field angle FOV is 76 °; the diameter phi of the image plane is 4.1 mm; the distance TTL between the object-side surface 11 of the first lens element 1 and the image plane 9 on the optical axis I is 15.0mm, and the maximum aperture D is 8.0 mm.
Example two
As shown in fig. 5, the lens elements of this embodiment have the same surface roughness and refractive index as those of the first embodiment, and only the optical parameters such as the curvature radius of the surface of each lens element and the lens thickness are different.
The detailed optical data of this embodiment is shown in Table 2-1.
TABLE 2-1 detailed optical data for example two
For the detailed data of the parameters of each aspheric surface of this embodiment, refer to the following table:
| surface of | 41 | 42 |
| K＝ | -7.285E+00 | -3.174E-01 |
| a4＝ | -1.392E-02 | -4.136E-04 |
| a6＝ | 1.678E-03 | -4.132E-04 |
| a8＝ | -1.234E-03 | -3.584E-05 |
| a10＝ | 7.326E-05 | 9.741E-06 |
| a12＝ | 6.722E-05 | -1.349E-06 |
| a14＝ | -1.335E-05 | 4.077E-09 |
Please refer to table 5 for the values of the conditional expressions related to this embodiment.
The MTF transfer function curve chart of the specific embodiment is shown in detail in FIG. 6, and it can be seen that the resolution is high, the transfer function is still larger than 0.3 at 160lp/mm, the imaging quality is excellent, and the sensor can meet the requirement of more than 100 ten thousand images; referring to fig. 7, it can be seen that the contrast is high and the uniformity is good; curvature of field and distortion referring to (a) and (B) of fig. 8, it can be seen that curvature of field and distortion are better corrected.
In this embodiment, the focal length f of the optical imaging lens is 2.9 mm; the f-number FNO is 1.2; the field angle FOV is 76 °; the diameter phi of the image plane is 4.1 mm; the distance TTL between the object-side surface 11 of the first lens element 1 and the image plane 9 on the optical axis I is 15.0mm, and the maximum aperture D is 8.0 mm.
EXAMPLE III
As shown in fig. 9, the lens elements of this embodiment have the same surface roughness and refractive index as those of the first embodiment, and only the optical parameters such as the curvature radius and the lens thickness of the surface of each lens element are different.
The detailed optical data of this embodiment is shown in Table 3-1.
TABLE 3-1 detailed optical data for EXAMPLE III
For the detailed data of the parameters of each aspheric surface of this embodiment, refer to the following table:
please refer to table 5 for the values of the conditional expressions related to this embodiment.
The MTF transfer function curve chart of the specific embodiment is shown in detail in FIG. 10, and it can be seen that the resolution is high, the transfer function is still larger than 0.3 at 160lp/mm, the imaging quality is excellent, and the sensor can meet the requirement of more than 100 ten thousand images; referring to fig. 11, it can be seen that the contrast is high and the uniformity is good; curvature of field and distortion referring to (a) and (B) of fig. 12, it can be seen that curvature of field and distortion are better corrected.
In this embodiment, the focal length f of the optical imaging lens is 2.9 mm; the f-number FNO is 1.2; the field angle FOV is 76 °; the diameter phi of the image plane is 4.1 mm; the distance TTL between the object-side surface 11 of the first lens element 1 and the image plane 9 on the optical axis I is 15.0mm, and the maximum aperture D is 8.0 mm.
Example four
As shown in fig. 13, the lens elements of this embodiment have the same surface roughness and refractive index as those of the first embodiment, and only the optical parameters such as the curvature radius and the lens thickness of the surface of each lens element are different.
The detailed optical data of this embodiment is shown in Table 4-1.
TABLE 4-1 detailed optical data for example four
For the detailed data of the parameters of each aspheric surface of this embodiment, refer to the following table:
| surface of | 41 | 42 |
| K＝ | 1.431E+01 | -3.206E-01 |
| a4＝ | -1.426E-02 | -1.238E-04 |
| a6＝ | 2.085E-03 | -2.128E-04 |
| a8＝ | -1.257E-03 | -6.818E-05 |
| a10＝ | 1.036E-04 | 3.468E-05 |
| a12＝ | 6.412E-05 | -6.474E-06 |
| a14＝ | -1.271E-05 | 4.787E-07 |
Please refer to table 5 for the values of the conditional expressions related to this embodiment.
The MTF transfer function curve chart of the specific embodiment is shown in detail in FIG. 14, and it can be seen that the resolution is high, the transfer function is still larger than 0.3 at 160lp/mm, the imaging quality is excellent, and the sensor can meet the requirement of more than 100 ten thousand images; referring to fig. 15, it can be seen that the contrast is high and the uniformity is good; curvature of field and distortion referring to (a) and (B) of fig. 16, it can be seen that curvature of field and distortion are better corrected.
In this embodiment, the focal length f of the optical imaging lens is 2.9 mm; the f-number FNO is 1.2; the field angle FOV is 76 °; the diameter phi of the image plane is 4.1 mm; the distance TTL between the object-side surface 11 of the first lens element 1 and the image plane 9 on the optical axis I is 15.0mm, and the maximum aperture D is 8.0 mm.
TABLE 5 values of relevant important parameters for four embodiments of the invention
| First embodiment | Second best modeExamples of the embodiments | Third embodiment | Fourth embodiment | |
| f1 | -10.13 | -10.92 | -9.59 | -9.45 |
| f2 | -9.77 | -9.85 | -9.35 | -9.66 |
| f | 2.9 | 2.9 | 2.9 | 2.9 |
| ∣f1/f∣ | 3.49 | 3.77 | 3.31 | 3.26 |
| ∣f2/f∣ | 3.37 | 3.40 | 3.22 | 3.33 |
| ALT | 8.28 | 7.83 | 8.81 | 8.78 |
| ALG | 6.51 | 6.96 | 5.98 | 6.01 |
| ALT/ALG | 1.27 | 1.13 | 1.47 | 1.46 |
| ∣Φ3∣ | 0.15 | 0.13 | 0.14 | 0.14 |
| ∣Φ4∣ | 0.20 | 0.20 | 0.19 | 0.19 |
| ∣Φ5∣ | 0.17 | 0.17 | 0.19 | 0.19 |
| ∣Φ6∣ | 0.15 | 0.14 | 0.13 | 0.13 |
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 (9)
1. The utility model provides a small-size optical imaging lens who leads to light greatly which characterized in that: the lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a sixth lens in sequence from the object side to the image side along an optical axis; the first lens, the second lens, the third lens and the fourth lens are respectively arranged on the object side and the image side, and the object side faces towards the object side and enables the imaging light rays to pass through;
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 convex object-side surface and a concave image-side surface;
the third lens element has positive refractive index, and the object-side surface of the third lens element is convex;
the fourth lens element with positive refractive index has a concave object-side surface and a convex 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 negative refractive index has a convex object-side surface and a concave image-side surface;
the object side surface and the image side surface of the third lens are both aspheric surfaces, or the object side surface and the image side surface of the fourth lens are both aspheric surfaces;
the optical imaging lens has only the first lens element to the sixth lens element with refractive index.
2. The small-sized large-light-transmission optical imaging lens according to claim 1, characterized in that: the diaphragm is arranged between the third lens and the fourth lens.
3. The small-sized optical imaging lens with large light transmission as claimed in claim 2, wherein the optical imaging lens further satisfies the following conditions: nd3 is more than or equal to 1.85, wherein nd3 is the refractive index of the third lens.
4. The small-sized optical imaging lens with large light transmission as claimed in claim 1, wherein the optical imaging lens further satisfies the following conditions: 2.7< | f1/f | <3.8 and 2.7< | f2/f | <3.8, wherein f1 is the focal length of the first lens, f2 is the focal length of the second lens, and f is the focal length of the optical imaging lens.
5. The small-sized optical imaging lens with large light transmission as claimed in claim 1, wherein the optical imaging lens further satisfies the following conditions: vd2 is more than or equal to 38, wherein vd2 is the abbe number of the second lens.
6. The small-sized optical imaging lens with large light transmission as claimed in claim 1, wherein the optical imaging lens further satisfies the following conditions: nd5>1.8, where nd5 is the refractive index of the fifth lens.
7. The small-sized optical imaging lens with large light transmission as claimed in claim 1, wherein the optical imaging lens further satisfies the following conditions: nd1 is more than or equal to 1.51 and less than or equal to nd2, nd4 is more than or equal to 1.68 and less than or equal to nd3 and less than or equal to 2.1, and nd6 is more than or equal to 1.49 and less than or equal to nd5 and less than or equal to 2.1, wherein nd1, nd2, nd3, nd4, nd5 and nd6 are refractive indexes of the first lens, the second lens, the third lens, the fourth lens, the fifth lens and the sixth lens respectively.
8. The small-sized optical imaging lens with large light transmission as claimed in claim 1, wherein the optical imaging lens further satisfies the following conditions: | phi 3 | is less than or equal to 0.16mm-1，∣Φ4∣≤0.21mm-1，∣Φ5∣≤0.2mm-1，∣Φ6∣≤0.15mm-1Wherein Φ 3 is the focal power of the third lens, Φ 4 is the focal power of the fourth lens, Φ 5 is the focal power of the fifth lens, ΦAnd 6 is the focal power of the sixth lens.
9. The small-sized optical imaging lens with large light transmission as claimed in claim 1, wherein the optical imaging lens further satisfies the following conditions: ALT <9mm, ALG <7mm, ALT/ALG <1.5, wherein ALT is the sum of six lens thicknesses of the first to sixth lenses on the optical axis, and ALG is the sum of air gaps of the first lens to the imaging plane on the optical axis.
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| CN202010786094.5A CN111751962B (en) | 2020-08-07 | 2020-08-07 | Small-size big optical imaging lens that lets in |
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| CN202010786094.5A CN111751962B (en) | 2020-08-07 | 2020-08-07 | Small-size big optical imaging lens that lets in |
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| CN111751962B CN111751962B (en) | 2024-08-16 |
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| CN112505891A (en) * | 2020-12-17 | 2021-03-16 | 厦门力鼎光电股份有限公司 | Optical imaging lens matched with liquid lens |
| CN112630940A (en) * | 2020-12-30 | 2021-04-09 | 厦门力鼎光电股份有限公司 | Optical imaging lens with large image surface |
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| CN111751962B (en) | 2024-08-16 |
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