CN213780517U - Optical imaging lens - Google Patents
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- CN213780517U CN213780517U CN202023277954.7U CN202023277954U CN213780517U CN 213780517 U CN213780517 U CN 213780517U CN 202023277954 U CN202023277954 U CN 202023277954U CN 213780517 U CN213780517 U CN 213780517U
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Abstract
The utility model relates to a camera lens technical field. The utility model discloses an optical imaging lens, including seven lens, first lens utensil positive refractive index and object side are protruding, and the convex-concave lens of second lens for utensil positive refractive index, and third lens utensil negative refractive index and image side are the concave surface, and fourth lens and seventh lens utensil negative refractive index's concave-concave lens, fifth lens are the convex-convex lens of utensil positive refractive index, and sixth lens are the convex flat or convex-convex lens of utensil positive refractive index, and fourth lens and fifth lens are glued each other. The utility model has the advantages of it is big to lead to light, and relative illuminance is even, and the resolution ratio is high, and the distortion is little, and imaging quality is good, and image planes are big, and is miniaturized, and the design yield is high.
Description
Technical Field
The utility model belongs to the technical field of the camera lens, specifically relate to an optical imaging camera lens for time of flight is measured.
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 defects, such as small image plane size, and cannot achieve a good measurement and identification effect on a long-distance target; the distortion control is poor, and a large amount of pixel loss is caused by distortion correction; the high-resolution TOF lens is large in overall size and falls away from the market miniaturization requirement; in order to realize large light transmission, large sacrifice on relative illumination of an edge field of view, large illumination change and the like, the increasingly improved requirements of the 3D scanning field cannot be met, and the improvement is urgently needed.
Disclosure of Invention
An object of the utility model is to provide an optical imaging lens is used for solving the technical problem that the above-mentioned exists.
In order to achieve the above object, the utility model adopts the following technical scheme: an optical imaging lens sequentially comprises a first lens, a second lens, a third lens, a fourth lens and a fifth lens from an object side to an image side along an optical axis; the first lens element to the seventh lens element each include an object-side surface facing the object side and passing the imaging light and an image-side surface facing the image side and passing the imaging light;
the first lens element has positive refractive index, and the object-side surface of the first lens element is convex;
the second lens element with positive refractive index has a convex object-side surface and a concave image-side surface;
the third lens element with negative refractive index has a concave image-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 flat or convex image-side surface;
the seventh lens element with negative refractive index has a concave object-side surface and a concave image-side surface;
the fourth lens and the fifth lens are mutually glued;
the optical imaging lens has only the first lens to the seventh lens.
Further, the sixth lens and the seventh lens are cemented to each other.
Further, the optical imaging lens further satisfies: nd7 is more than or equal to 1.70 and less than or equal to nd6, and nd6-nd7 is more than or equal to 0.18, wherein nd6 is the refractive index of the sixth lens, and nd7 is the refractive index of the seventh lens.
Further, the optical imaging lens further satisfies: t5 is more than or equal to 6.0mm and less than or equal to 12mm, T6 is more than or equal to 7.0mm and less than or equal to 12.0mm, wherein T5 is the thickness of the fifth lens on the optical axis, and T6 is the thickness of the sixth lens on the optical axis.
Further, the optical imaging lens further satisfies: f67/f is more than or equal to 0.8 and less than or equal to 1.2, wherein f67 is the combined focal length of the sixth lens and the seventh lens, and f is the focal length of the optical imaging lens.
Further, the optical imaging lens further satisfies: f1/f is more than or equal to 1.4 and less than or equal to 1.6, and nd1 is more than or equal to 1.75, wherein f1 is the focal length of the first lens, f is the focal length of the optical imaging lens, and nd1 is the refractive index of the first lens.
Further, the optical imaging lens further satisfies: nd2 & lt nd3 & lt 2.0, 25 & lt vd2-vd3, and G23 & lt 1.4, wherein nd2 is the refractive index of the second lens, nd3 is the refractive index of the third lens, vd2 is the abbe number of the second lens, vd3 is the abbe number of the third lens, and G23 is the air space between the second lens and the third lens on the optical axis.
Further, the optical imaging lens further satisfies: BFL/f is not less than 0.23, wherein BFL is the distance on the optical axis from the image side surface of the seventh lens to the imaging surface, and f is the focal length of the optical imaging lens.
Further, the optical imaging lens further satisfies: nd4-nd5 is less than or equal to 0.12, vd5-vd4 is more than or equal to 25, nd4 is the refractive index of the fourth lens, nd5 is the refractive index of the fifth lens, vd4 is the abbe number of the fourth lens, and vd5 is the abbe number of the fifth lens.
Further, the optical imaging lens further satisfies: TTL/f is more than or equal to 1.65 and less than or equal to 1.95, wherein TTL is the distance between the object side surface of the first lens and the imaging surface on the optical axis, and f is the focal length of the optical imaging lens.
The utility model has the advantages of:
the utility model adopts seven lenses, and through correspondingly designing each lens, the light transmission is large, which can reach below 1.2, and the identification range is enlarged; the optical transfer function has good control, high resolution and high contrast; the distortion correction is right, and the serious condition of pixel loss under the distortion correction condition is reduced; the design yield is high and can reach more than 95%; the relative illumination is controlled, so that the relative illumination is uniform under the condition of large light transmission; the image surface is large; the whole size is small.
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 described below, and 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 these drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a first embodiment of the present invention;
FIG. 2 is a graph of MTF of infrared 785nm-842nm according to a first embodiment of the present invention;
FIG. 3 is a defocus graph of the first embodiment of the present invention at 25lp/mm infrared 785nm-842 nm;
fig. 4 is a graph of field curvature and distortion according to the first embodiment of the present invention;
fig. 5 is a graph of the relative illuminance of infrared 815nm according to a first embodiment of the present invention;
fig. 6 is a schematic structural diagram of a second embodiment of the present invention;
FIG. 7 is a graph of the MTF of infrared 785nm-842nm of the second embodiment of the present invention;
FIG. 8 is a defocus graph of 785nm-842nm infrared light at 25lp/mm according to the second embodiment of the present invention;
fig. 9 is a graph of field curvature and distortion according to a second embodiment of the present invention;
fig. 10 is a graph of the relative illuminance of infrared 815nm according to the second embodiment of the present invention;
fig. 11 is a schematic structural diagram of a third embodiment of the present invention;
FIG. 12 is a graph of the MTF of the infrared 785nm-842nm of the third embodiment of the present invention;
FIG. 13 is a defocus graph of 785nm-842nm infrared light at 25lp/mm according to the third embodiment of the present invention;
fig. 14 is a graph of field curvature and distortion according to a third embodiment of the present invention;
fig. 15 is a graph of the relative illuminance of infrared 815nm according to a third embodiment of the present invention;
fig. 16 is a schematic structural diagram of a fourth embodiment of the present invention;
FIG. 17 is a graph of the MTF of 785nm-842nm infrared light of example four of the present invention;
FIG. 18 is a defocus graph of 785nm-842nm infrared light at 25lp/mm in the fourth embodiment of the present invention;
fig. 19 is a graph of field curvature and distortion according to a fourth embodiment of the present invention;
fig. 20 is a graph of the relative illuminance at 815nm in the infrared according to the fourth embodiment of the present invention;
fig. 21 is a schematic structural diagram of a fifth embodiment of the present invention;
FIG. 22 is an MTF plot of infrared 785nm-842nm of inventive example V;
fig. 23 is a defocus graph of 785nm-842nm infrared light at 25lp/mm according to the fifth embodiment of the present invention;
fig. 24 is a graph of curvature of field and distortion according to a fifth embodiment of the present invention;
fig. 25 is a graph of the relative illuminance at 815nm in the infrared region according to the fifth embodiment of the present invention.
Detailed Description
To further illustrate the embodiments, the present 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. With these references, one of ordinary skill in the art will appreciate other possible embodiments and advantages of the present invention. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.
The present 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 utility model discloses an optical imaging 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 a fifth lens from an object side to an image side along an optical axis; the first lens element to the seventh 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 has positive refractive index, and the object-side surface of the first lens element is convex; the first lens pre-dioptres the system.
The second lens element with positive refractive index has a convex object-side surface and a concave image-side surface.
The third lens element has a negative refractive index and a concave image-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 power has a convex object-side surface and a convex image-side surface.
The sixth lens element with positive refractive power has a convex object-side surface and a flat or convex image-side surface.
The seventh lens element with negative refractive index has a concave object-side surface and a concave image-side surface.
The fourth lens and the fifth lens are cemented to each other.
The optical imaging lens has only the first lens to the seventh lens. The utility model adopts seven lenses, and through correspondingly designing each lens, the light transmission is large, which can reach below 1.2, and the identification range is enlarged; the optical transfer function has good control, high resolution and high contrast; the distortion correction is right, and the serious condition of pixel loss under the distortion correction condition is reduced; the design yield is high and can reach more than 95%; the relative illumination is controlled, so that the relative illumination is uniform under the condition of large light transmission; the image surface is large; the whole size is small.
Preferably, the sixth lens and the seventh lens are mutually cemented, chromatic aberration is further corrected, and the processing difficulty is reduced.
More preferably, the optical imaging lens further satisfies: nd7 and nd6 are more than or equal to 1.70 and more than or equal to 0.18, nd6-nd7 are more than or equal to 0.18, nd6 is the refractive index of the sixth lens, and nd7 is the refractive index of the seventh lens, so that the primary aberration is effectively reduced.
Preferably, the optical imaging lens further satisfies: t5 is more than or equal to 6.0mm and less than or equal to 12mm, T6 is more than or equal to 7.0mm and less than or equal to 12.0mm, wherein T5 is the thickness of the fifth lens on the optical axis, and T6 is the thickness of the sixth lens on the optical axis, so that the field curvature is further optimized, and the processing difficulty of the lens is reduced.
Preferably, the optical imaging lens further satisfies: f67/f is more than or equal to 0.8 and less than or equal to 1.2, wherein f67 is the combined focal length of the sixth lens and the seventh lens, and f is the focal length of the optical imaging lens, so that the system focal length is provided, the system structure is optimized, and the processing difficulty is reduced.
Preferably, the optical imaging lens further satisfies: f1/f is more than or equal to 1.4 and less than or equal to 1.6, and nd1 is more than or equal to 1.75, wherein f1 is the focal length of the first lens, f is the focal length of the optical imaging lens, and nd1 is the refractive index of the first lens, so that the system is further subjected to pre-refraction.
Preferably, the optical imaging lens further satisfies: nd2 is more than or equal to 1.55 and less than nd3 and less than 2.0, vd2-vd3 is more than or equal to 25 and less than or equal to 0.1 and less than or equal to 1.4, wherein nd2 is the refractive index of the second lens, nd3 is the refractive index of the third lens, vd2 is the abbe number of the second lens, vd3 is the abbe number of the third lens, and G23 is the air space between the second lens and the third lens on the optical axis, so that the chromatic aberration of the system is further optimized.
Preferably, the optical imaging lens further satisfies: BFL/f is not less than 0.23, wherein BFL is the distance between the image side surface of the seventh lens and the imaging surface on the optical axis, and f is the focal length of the optical imaging lens, so that a larger optical back focus is ensured, and the adaptability is improved.
Preferably, the optical imaging lens further satisfies: nd4-nd5 is less than or equal to 0.12, vd5-vd4 is more than or equal to 25, nd4 is the refractive index of the fourth lens, nd5 is the refractive index of the fifth lens, vd4 is the dispersion coefficient of the fourth lens, and vd5 is the dispersion coefficient of the fifth lens, so that chromatic aberration of the system is further eliminated, the use under different light source conditions is effectively met, and the anti-interference performance of the system is improved.
Preferably, the optical imaging lens further satisfies: TTL/f is more than or equal to 1.65 and less than or equal to 1.95, wherein TTL is the distance between the object side surface of the first lens and the imaging surface on the optical axis, and f is the focal length of the optical imaging lens, so that the optical imaging lens is more compact, and miniaturization is further realized.
The optical imaging lens of the present invention will be described in detail with reference to specific embodiments.
Example one
As shown in fig. 1, an 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 8, a fourth lens 4, a fifth lens 5, a sixth lens 6, a seventh lens 7, a protective glass 9, and an image plane 100 from an object side a1 to an image side a 2; the first lens element 1 to the seventh lens element 7 each include an object-side surface facing the object side a1 and passing the image light, and an image-side surface facing the image side a2 and passing the image light.
The first lens element 1 has a positive refractive index, an object-side surface 11 of the first lens element 1 is a convex surface, and an image-side surface 12 of the first lens element 1 is a flat surface. Of course, in other embodiments, the image-side surface 12 of the first lens element 1 may be convex or concave.
The second lens element 2 has a positive 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 a negative refractive index, and an object-side surface 31 of the third lens element 3 is convex and an image-side surface 32 of the third lens element 3 is concave. Of course, in some embodiments, the object side surface 31 of the third lens element 3 may also be planar or concave.
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 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 positive 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 convex. Of course, in some embodiments, the image side surface 62 of the sixth lens element 6 may also be a plane.
The seventh lens element 7 has a negative refractive index, and an object-side surface 71 of the seventh lens element 7 is concave and an image-side surface 72 of the seventh lens element 7 is concave.
The fourth lens 4 and the fifth lens 5 are cemented with each other, and the sixth lens 6 and the seventh lens 7 are cemented with each other.
In this embodiment, the diaphragm 8 is disposed between the third lens 3 and the fourth lens 4, but is not limited thereto, and in some embodiments, the diaphragm 8 may be disposed 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
Please refer to table 6 for the values of the conditional expressions related to this embodiment.
The MTF transfer function curve graph of the specific embodiment is detailed in FIG. 2, the defocusing curve graph is detailed in FIG. 3, and it can be seen that the resolution is high, the contrast is high, the imaging quality is excellent, and the high resolution level in the TOF field is achieved; referring to (a) and (B) of fig. 4, it can be seen that curvature of field and distortion are better corrected, and the distortion amount is-2.0%; referring to fig. 5, it can be seen that the contrast is high, reaching above 0.9, and the uniformity is good.
In this embodiment, the focal length f of the optical imaging lens is 28.90 mm; the f-number FNO is 1.20; field angle FOV is 20.0 °; the height of the image plane is 10.0 mm; the distance TTL between the object side surface 11 of the first lens element 1 and the image plane 100 on the optical axis I is 51.30 mm.
Example two
As shown in fig. 6, the surface-type convexo-concave shapes and the refractive indexes of the lenses of the present embodiment and the first embodiment are substantially the same, only the image-side surface 31 of the third lens element 3 is a concave surface, and the sixth lens element 6 and the seventh lens element 7 are separate lenses, in which the optical parameters such as the curvature radius of the lens surfaces 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
Please refer to table 6 for the values of the conditional expressions related to this embodiment.
The MTF transfer function curve graph of the specific embodiment is shown in detail in FIG. 7, the defocusing curve graph is shown in detail in FIG. 8, and it can be seen that the resolution is high, the contrast is high, the imaging quality is excellent, and the high resolution level in the TOF field is achieved; referring to (a) and (B) of fig. 9, it can be seen that curvature of field and distortion are better corrected, and the distortion amount is-1.5%; referring to fig. 10, it can be seen that the contrast is high, reaching above 0.85, and the uniformity is good.
In this embodiment, the focal length f of the optical imaging lens is 28.76 mm; the f-number FNO is 1.20; field angle FOV is 20.0 °; the height of the image plane is 10.0 mm; the distance TTL between the object side surface 11 of the first lens element 1 and the image plane 100 on the optical axis I is 54.52 mm.
EXAMPLE III
As shown in fig. 11, 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
Please refer to table 6 for the values of the conditional expressions related to this embodiment.
The MTF transfer function curve graph of the specific embodiment is shown in detail in FIG. 12, the defocusing curve graph is shown in detail in FIG. 13, and it can be seen that the resolution is high, the contrast is high, the imaging quality is excellent, and the high resolution level in the TOF field is achieved; referring to (a) and (B) of fig. 14, it can be seen that curvature of field and distortion are better corrected, and the distortion amount is-2.2%; referring to fig. 15, it can be seen that the contrast is high, reaching above 0.9, and the uniformity is good.
In this embodiment, the focal length f of the optical imaging lens is 28.90 mm; the f-number FNO is 1.20; field angle FOV is 20.0 °; the height of the image plane is 10.0 mm; the distance TTL between the object side surface 11 of the first lens element 1 and the image plane 100 on the optical axis I is 52.45 mm.
Example four
As shown in fig. 16, 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
Please refer to table 6 for the values of the conditional expressions related to this embodiment.
The MTF transfer function curve graph of the specific embodiment is shown in detail in FIG. 17, the defocusing curve graph is shown in detail in FIG. 18, and it can be seen that the resolution is high, the contrast is high, the imaging quality is excellent, and the high resolution level in the TOF field is achieved; referring to (a) and (B) of fig. 19, it can be seen that curvature of field and distortion are better corrected, and the distortion amount is-1.7%; referring to fig. 20, it can be seen that the contrast is high, reaching above 0.85, and the uniformity is good.
In this embodiment, the focal length f of the optical imaging lens is 28.80 mm; the f-number FNO is 1.20; field angle FOV is 20.0 °; the height of the image plane is 10.0 mm; the distance TTL between the object side surface 11 of the first lens element 1 and the image plane 100 on the optical axis I is 48.21 mm.
EXAMPLE five
As shown in fig. 21, the surface-type convexo-concave and refractive index of each lens element of the present embodiment are substantially the same as those of the first embodiment, only the image-side surface 12 of the first lens element 1 is a concave surface, and 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 5-1.
TABLE 5-1 detailed optical data for EXAMPLE V
Please refer to table 6 for the values of the conditional expressions related to this embodiment.
The MTF transfer function curve graph of the specific embodiment is shown in detail in FIG. 22, the defocusing curve graph is shown in detail in FIG. 23, and it can be seen that the resolution is high, the contrast is high, the imaging quality is excellent, and the high resolution level in the TOF field is achieved; referring to (a) and (B) of fig. 24, it can be seen that curvature of field and distortion are better corrected, and the distortion amount is-1.8%; referring to fig. 25, it can be seen that the contrast is high, reaching above 0.90, and the uniformity is good.
In this embodiment, the focal length f of the optical imaging lens is 28.81 mm; the f-number FNO is 1.20; field angle FOV is 20.0 °; the height of the image plane is 10.0 mm; the distance TTL between the object side surface 11 of the first lens element 1 and the image plane 100 on the optical axis I is 48.52 mm.
Table 6 values of relevant important parameters of five embodiments of the present invention
| First embodiment | Second embodiment | Third embodiment | Fourth embodiment | Fifth embodiment | |
| nd6-nd7 | 0.22 | 0.28 | 0.22 | 0.20 | 0.20 |
| T5 | 8.74 | 10.46 | 7.84 | 6.39 | 7.66 |
| T6 | 9.86 | 8.46 | 10.79 | 7.47 | 7.82 |
| f67 | 24.62 | 33.32 | 25.77 | 23.66 | 23.39 |
| f1 | 43.65 | 41.86 | 44.85 | 44.80 | 44.29 |
| f | 28.9 | 28.76 | 28.9 | 28.8 | 28.81 |
| f67/f | 0.85 | 1.16 | 0.89 | 0.82 | 0.81 |
| f1/f | 1.51 | 1.46 | 1.55 | 1.56 | 1.54 |
| vd2-vd3 | 40.3 | 40.3 | 40.0 | 40.3 | 40.3 |
| G23 | 0.53 | 1.27 | 0.40 | 0.45 | 0.43 |
| BFL | 7.14 | 10.62 | 6.51 | 7.79 | 7.79 |
| BFL/f | 0.25 | 0.37 | 0.23 | 0.27 | 0.27 |
| nd4-nd5 | 0.01 | 0.01 | 0.01 | 0.01 | 0.01 |
| vd5-vd4 | 30.6 | 30.6 | 30.3 | 30.6 | 30.6 |
| TTL | 51.30 | 54.52 | 52.45 | 48.21 | 48.52 |
| TTL/f | 1.77 | 1.90 | 1.81 | 1.67 | 1.68 |
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 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 element to the seventh lens element each include an object-side surface facing the object side and passing the imaging light and an image-side surface facing the image side and passing the imaging light;
the first lens element has positive refractive index, and the object-side surface of the first lens element is convex;
the second lens element with positive refractive index has a convex object-side surface and a concave image-side surface;
the third lens element with negative refractive index has a concave image-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 flat or convex image-side surface;
the seventh lens element with negative refractive index has a concave object-side surface and a concave image-side surface;
the fourth lens and the fifth lens are mutually glued;
the optical imaging lens has only the first lens to the seventh lens.
2. The optical imaging lens according to claim 1, characterized in that: the sixth lens and the seventh lens are cemented to each other.
3. The optical imaging lens of claim 2, further satisfying: nd7 is more than or equal to 1.70 and less than or equal to nd6, and nd6-nd7 is more than or equal to 0.18, wherein nd6 is the refractive index of the sixth lens, and nd7 is the refractive index of the seventh lens.
4. The optical imaging lens of claim 1, further satisfying: t5 is more than or equal to 6.0mm and less than or equal to 12mm, T6 is more than or equal to 7.0mm and less than or equal to 12.0mm, wherein T5 is the thickness of the fifth lens on the optical axis, and T6 is the thickness of the sixth lens on the optical axis.
5. The optical imaging lens of claim 1, further satisfying: f67/f is more than or equal to 0.8 and less than or equal to 1.2, wherein f67 is the combined focal length of the sixth lens and the seventh lens, and f is the focal length of the optical imaging lens.
6. The optical imaging lens of claim 1, further satisfying: f1/f is more than or equal to 1.4 and less than or equal to 1.6, and nd1 is more than or equal to 1.75, wherein f1 is the focal length of the first lens, f is the focal length of the optical imaging lens, and nd1 is the refractive index of the first lens.
7. The optical imaging lens of claim 1, further satisfying: nd2 & lt nd3 & lt 2.0, 25 & lt vd2-vd3, and G23 & lt 1.4, wherein nd2 is the refractive index of the second lens, nd3 is the refractive index of the third lens, vd2 is the abbe number of the second lens, vd3 is the abbe number of the third lens, and G23 is the air space between the second lens and the third lens on the optical axis.
8. The optical imaging lens of claim 1, further satisfying: BFL/f is not less than 0.23, wherein BFL is the distance on the optical axis from the image side surface of the seventh lens to the imaging surface, and f is the focal length of the optical imaging lens.
9. The optical imaging lens of claim 1, further satisfying: nd4-nd5 is less than or equal to 0.12, vd5-vd4 is more than or equal to 25, nd4 is the refractive index of the fourth lens, nd5 is the refractive index of the fifth lens, vd4 is the abbe number of the fourth lens, and vd5 is the abbe number of the fifth lens.
10. The optical imaging lens of claim 1, further satisfying: TTL/f is more than or equal to 1.65 and less than or equal to 1.95, wherein TTL is the distance between the object side surface of the first lens and the imaging surface on the optical axis, and f is the focal length of the optical imaging lens.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023277954.7U CN213780517U (en) | 2020-12-30 | 2020-12-30 | Optical imaging lens |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202023277954.7U CN213780517U (en) | 2020-12-30 | 2020-12-30 | Optical imaging lens |
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