CN212321966U - Optical imaging lens - Google Patents
Optical imaging lens Download PDFInfo
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- CN212321966U CN212321966U CN202021475196.7U CN202021475196U CN212321966U CN 212321966 U CN212321966 U CN 212321966U CN 202021475196 U CN202021475196 U CN 202021475196U CN 212321966 U CN212321966 U CN 212321966U
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Abstract
The utility model relates to a camera lens technical field. The utility model discloses an optical imaging lens, which comprises a first lens, a second lens, a diaphragm, a third lens and a fourth lens from an object side to an image side along an optical axis in sequence; the first lens is a convex-concave lens with positive refractive index; the second lens is a concave lens with negative refractive index; the third lens is a plano-convex lens with positive refractive index; the fourth lens element has positive refractive index, the object side surface is a convex surface, the first lens element to the fourth lens element are all glass lens elements, the ratio of the thickness of the edge of the lens element to the thickness of the center of the lens element of the first lens element, the third lens element and the fourth lens element is between 0.4 and 0.8, the ratio of the thickness of the edge of the lens element to the thickness of the center of the lens element of the second lens element is between 2.2 and 2.9, and the positive refractive index satisfies the following conditions: 1.67< nd1, 1.75< nd3 and 1.7< nd 4. The utility model has the advantages of low cost and easy processing; the resolution ratio is high, and the imaging quality is good; the light transmission is large, and the contrast is high; the structure is compact, the anti-seismic performance is good, and the stability is high; the advantage of miniaturization.
Description
Technical Field
The utility model belongs to the technical field of the camera lens, specifically relate to an optical imaging camera lens.
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 widely applied to various fields such as smart phones, tablet computers, video conferences, vehicle-mounted monitoring, security monitoring, machine vision, intelligent traffic systems and the like, so that the requirements on the optical imaging lenses are higher and higher.
In a vehicle-mounted laser radar system, the performance of a laser radar receiving lens is critical, and the reliability of the whole system can be influenced. However, the lens of the existing laser radar receiving lens has high process difficulty and high material and processing cost; the imaging quality is not high, and the signal receiving quality is difficult to ensure; the clear aperture is generally smaller, and the signal-to-noise ratio capability of the edge of a receiving chip is not high; the structure is unstable, the anti-seismic performance is weak, and the shock-proof structure is easily influenced by the shock of a vehicle body; the structure is too lengthy, is not favorable to the automobile body installation and use, can not satisfy the increasing requirement of on-vehicle laser radar system, and the urgent need is improved.
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 diaphragm, a third 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 provided with an object side surface facing the object side and allowing the imaging light to pass through and an image side surface facing the image side and allowing the imaging light to pass through;
the first lens element with positive 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 planar object-side surface and a convex image-side surface;
the fourth lens element with positive refractive index has a convex object-side surface;
the first lens to the fourth lens are all glass lenses, the ratio of the thickness of the edge of the lens to the thickness of the center of the lens of the first lens, the third lens and the fourth lens is 0.4-0.8, the ratio of the thickness of the edge of the lens to the thickness of the center of the lens of the second lens is 2.2-2.9, and the requirements are met: 1.67< nd1, 1.75< nd3 and 1.7< nd4, where nd1 is the refractive index of the first lens, nd3 is the refractive index of the third lens, and nd4 is the refractive index of the fourth lens;
the optical imaging lens has only the first lens to the fourth lens with the refractive index.
Further, the optical imaging lens further satisfies the following conditions: 1< | f1/f | <3, 0< | f2/f | <3, 1< | f3/f | <3, and 1< | f4/f | <3, wherein f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, and f is the focal length of the optical imaging lens.
Furthermore, the optical imaging lens further satisfies the following conditions: 10mm < f1<22mm, -8mm < f2< -5mm, 7mm < f3<11mm, 10mm < f4<15mm, wherein f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, and f4 is the focal length of the fourth lens.
Furthermore, the object side surface and the image side surface of the first lens to the fourth lens are respectively coated with an antireflection film with the wavelength of 900 nm.
Further, the optical imaging lens further satisfies the following conditions: 7mm < R11<15mm, 30mm < R12<62mm, -8mm < R21< -5mm, 13mm < R22<17mm, -10mm < R32< -7mm, 7mm < R41<10mm, wherein R11, R21, and R41 are radii of curvature of object-side surfaces of the first lens, the second lens, and the fourth lens, and R12, R22, and R32 are radii of curvature of image-side surfaces of the first lens, the second lens, and the third lens, respectively.
Further, the optical imaging lens further satisfies the following conditions: 1.67< nd1<1.9, 20< vd1< 56; 1.5< nd2<1.76, 35< vd2<57, 1.75< nd3<2.0, 20< vd3<48, 1.7< nd4<1.93, 20< vd4<40, where nd1, nd2, nd3, and nd4 are refractive indices of the first to fourth lenses, respectively, and vd1, vd2, vd3, and vd4 are abbe numbers of the first to fourth lenses, respectively.
Further, the optical imaging lens further satisfies the following conditions: 0.6< (D11/R11) <1.2, 0.1< (D12/R12) <0.7, 0.7< | (D21/R21) | <1.1, 0.1< (D22/R22) <0.7, 1< | (D32/R32) | <1.3, 0.8< (D32/R32) ≦ 1.2, 0.01< | (D32/R32) ≦ 0.5, wherein D32, D32 and D32 are respectively an object-side surface of the first lens, an image-side surface of the first lens, an object-side surface of the second lens, an image-side surface of the second lens, an object-side surface of the third lens, an object-side surface of the fourth lens, an object-side surface of the third lens, an object-side surface of the second lens, an object side surface of the third lens, an object side surface of the second lens, an object side surface of the third lens, an object side surface of the fourth lens, an object side surface of the third lens, an object side surface of the second lens, an object side surface of the third lens, a second lens, an object, A radius of curvature of an object-side surface of the fourth lens and an image-side surface of the fourth lens.
The utility model has the advantages of:
the utility model adopts four lenses, and by correspondingly designing each lens, the material and processing cost are low, and the feasibility of industrial mass production is realized; the requirement of high resolution is met, and the signal receiving quality is ensured; the light is transmitted greatly, the signal-to-noise ratio of edge signals is greatly improved, so that the uniformity of light spots is high, and the noise interference is low; the relative illumination is high, and the overall brightness uniformity of the picture is high; the structure is compact, the anti-seismic performance is good, and the stability is high; the advantage of miniaturization.
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 MTF chart of 0.840 μm infrared in accordance with the first embodiment of the present invention;
FIG. 3 is a defocus graph of the first embodiment of the present invention at 10lp/mm in the infrared 900 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 relative illuminance of infrared 900nm according to the first embodiment of the present invention;
fig. 6 is a dot-column diagram of the first embodiment of the present invention;
fig. 7 is a schematic structural diagram of a second embodiment of the present invention;
FIG. 8 is a MTF chart of infrared 0.840 μm according to the second embodiment of the present invention;
FIG. 9 is a defocus graph of the second embodiment of the present invention at 10lp/mm in the infrared 900 nm;
fig. 10 is a graph of field curvature and distortion according to a second embodiment of the present invention;
fig. 11 is a graph of the infrared 900nm relative illuminance of the second embodiment of the present invention;
fig. 12 is a dot-column diagram of the second embodiment of the present invention;
fig. 13 is a schematic structural view of a third embodiment of the present invention;
FIG. 14 is a MTF plot of 0.840 μm infrared for the third embodiment of the present invention;
FIG. 15 is a defocus graph of the third embodiment of the present invention at 10lp/mm in the infrared 900 nm;
fig. 16 is a graph of field curvature and distortion according to a third embodiment of the present invention;
fig. 17 is a graph of the infrared 900nm relative illuminance of the third embodiment of the present invention;
fig. 18 is a dot-column diagram of a third embodiment of the present invention;
fig. 19 is a schematic structural diagram of a fourth embodiment of the present invention;
fig. 20 is an MTF plot of infrared 0.840 μm for embodiment four of the present invention;
FIG. 21 is a graph showing the defocus curve of the fourth embodiment of the present invention at 10lp/mm in the infrared 900 nm;
fig. 22 is a graph of field curvature and distortion according to a fourth embodiment of the present invention;
fig. 23 is a graph of the relative illuminance of the infrared 900nm according to the fourth embodiment of the present invention;
fig. 24 is a dot-column diagram of a fourth embodiment of the present invention;
fig. 25 is a schematic structural diagram of a fifth embodiment of the present invention;
fig. 26 is an MTF plot of infrared 0.840 μm for example five of the present invention;
FIG. 27 is a graph showing the defocus of the infrared 900nm at 10lp/mm in the fifth embodiment of the present invention;
fig. 28 is a graph of curvature of field and distortion according to a fifth embodiment of the present invention;
fig. 29 is a graph of the infrared 900nm relative illuminance of the fifth embodiment of the present invention;
fig. 30 is a dot-column diagram of a 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.
As used herein, the term "a lens element having a positive refractive index (or a negative refractive index)" means that the paraxial refractive index of the lens element calculated by Gaussian optics 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 provides an optical imaging lens, which comprises a first lens, a second lens, a diaphragm, a third lens and a fourth lens from an object side to an image side along an optical axis in sequence; the first lens element to the fourth 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 positive 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 power has a planar object-side surface and a convex image-side surface.
The fourth lens element has a positive refractive index, and the object-side surface of the fourth lens element is convex.
The first lens to the fourth lens are all glass lenses, and have the advantages of low material and processing cost, feasibility of industrial mass production and good stability.
The ratio of the thickness of the edge of the lens to the thickness of the center of the lens of the first lens, the third lens and the fourth lens is 0.4-0.8, and the ratio of the thickness of the edge of the lens of the second lens to the thickness of the center of the lens is 2.2-2.9, so that the optical imaging lens is more compact in overall structure and good in stability, and can still maintain good optical performance in a vibration environment.
And satisfies the following conditions: 1.67< nd1, 1.75< nd3 and 1.7< nd4, wherein nd1 is the refractive index of the first lens, nd3 is the refractive index of the third lens, and nd4 is the refractive index of the fourth lens, and large light transmission is realized.
The optical imaging lens has only the first lens to the fourth lens with the refractive index. The utility model adopts four lenses, and by correspondingly designing each lens, the cost is low, and the feasibility of industrial mass production is realized; the requirement of high resolution is met, and the signal receiving quality is ensured; the signal-to-noise ratio of edge signals is greatly improved due to large light transmission, so that the uniformity of light spots is high, and the noise interference is low; the relative illumination is high, and the overall brightness uniformity of the picture is high; the structure is compact, the anti-seismic performance is good, and the stability is high; the advantage of miniaturization.
Preferably, the optical imaging lens further satisfies: 1< | f1/f | <3, 0< | f2/f | <3, 1< | f3/f | <3, and 1< | f4/f | <3, wherein f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, and f is the focal length of the optical imaging lens.
More preferably, the optical imaging lens further satisfies: 10mm < f1<22mm, -8mm < f2< -5mm, 7mm < f3<11mm, 10mm < f4<15mm, wherein f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, and f4 is the focal length of the fourth lens.
Preferably, the object side surface and the image side surface of the first lens to the fourth lens are respectively coated with an antireflection film with the wavelength of 900nm, so that the transmittance of the whole signal light is increased.
Preferably, the optical imaging lens further satisfies: 7mm < R11<15mm, 30mm < R12<62mm, -8mm < R21< -5mm, 13mm < R22<17mm, -10mm < R32< -7mm, and 7mm < R41<10mm, wherein R11, R21 and R41 are curvature radiuses of object side surfaces of the first lens, the second lens and the fourth lens, and R12, R22 and R32 are curvature radiuses of image side surfaces of the first lens, the second lens and the third lens respectively, so that the processing and molding are easy, and the detection difficulty is reduced.
Preferably, the optical imaging lens further satisfies: 1.67< nd1<1.9, 20< vd1< 56; 1.5< nd2<1.76, 35< vd2<57, 1.75< nd3<2.0, 20< vd3<48, 1.7< nd4<1.93, 20< vd4<40, where nd1, nd2, nd3, and nd4 are refractive indices of the first to fourth lenses, respectively, and vd1, vd2, vd3, and vd4 are abbe indices of the first to fourth lenses, respectively, to further balance chromatic aberration.
Preferably, the optical imaging lens further satisfies: 0.6< (D11/R11) <1.2, 0.1< (D12/R12) <0.7, 0.7< | (D21/R21) | <1.1, 0.1< (D22/R22) <0.7, 1< | (D32/R32) | <1.3, 0.8< (D32/R32) ≦ 1.2, 0.01< | (D32/R32) ≦ 0.5, wherein D32, D32 and D32 are respectively an object-side surface of the first lens, an image-side surface of the first lens, an object-side surface of the second lens, an image-side surface of the second lens, an object-side surface of the third lens, an object-side surface of the fourth lens, an object-side surface of the third lens, an object-side surface of the second lens, an object side surface of the third lens, an object side surface of the second lens, an object side surface of the third lens, an object side surface of the fourth lens, an object side surface of the third lens, an object side surface of the second lens, an object side surface of the third lens, a second lens, an object, The curvature radiuses of the object side surface of the fourth lens and the image side surface of the fourth lens enable the lenses to be easily machined and molded.
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 stop 5, a third lens 3, a fourth lens 4, and an image plane 6 from an object side a1 to an image side a 2; the first lens element 1 to the fourth lens element 4 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, 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 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, and an object-side surface 31 of the third lens element 3 is a flat surface and an image-side surface 32 of the third lens element 3 is a convex surface.
The fourth lens element 4 has a positive refractive index, and an object-side surface 41 of the fourth lens element 4 is convex and an image-side surface 42 of the fourth lens element 4 is concave.
In this embodiment, the first lens 1 to the fourth lens 4 are all glass spherical lenses.
In this embodiment, the object- side surfaces 11, 21, 31, and 41 and the image- side surfaces 12, 22, 32, and 42 are coated with antireflection films having a wavelength of 900 nm.
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 curve chart of the present embodiment is shown in detail in fig. 2, and the focal shift curve chart is shown in detail in fig. 3, so that the MTF value of the spatial frequency of 20lp/mm is greater than 0.3 when in use, which meets the requirement of image definition and has good uniformity; as for the field curvature and distortion diagram, please refer to (a) and (B) of fig. 4, it can be seen that the field curvature and distortion are small, and the imaging quality is good; referring to fig. 5, it can be seen that the total field of view is greater than 98%, and the overall brightness uniformity of the picture is high; referring to fig. 6, it can be seen that the aberration is small and the imaging quality is good.
In this embodiment, the focal length f of the optical imaging lens is 7.6 mm; the f-number FNO is 1.2; field angle FOV is 25 °; the size of the image surface is 1/2.8 inches; the distance TTL between the object-side surface 11 of the first lens element 1 and the image plane 6 on the optical axis I is 15.13 mm.
Example two
As shown in fig. 7, 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
Please refer to table 6 for the values of the conditional expressions related to this embodiment.
The MTF curve chart of the present embodiment is shown in detail in fig. 8, and the focal shift curve chart is shown in detail in fig. 9, so that the MTF value of the spatial frequency of 20lp/mm is greater than 0.6 when the optical lens is used, the requirement of image definition is met, and the uniformity is good; referring to (a) and (B) of fig. 10, it can be seen that the field curvature and distortion are small, and the imaging quality is good; referring to fig. 11, it can be seen that the total field of view is greater than 98%, and the overall brightness uniformity of the picture is high; referring to fig. 12, it can be seen that the aberration is small and the imaging quality is good.
In this embodiment, the focal length f of the optical imaging lens is 7.6 mm; the f-number FNO is 1.2; field angle FOV is 25 °; the size of the image surface is 1/2.8 inches; the distance TTL between the object side surface 11 of the first lens element 1 and the image forming surface 6 on the optical axis I is 14.29 mm.
EXAMPLE III
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 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 curve chart of the present embodiment is shown in detail in fig. 14, and the focal shift curve chart is shown in detail in fig. 15, so that the MTF value of the spatial frequency of 20lp/mm is greater than 0.5 when in use, which meets the requirement of image definition and has good uniformity; referring to (a) and (B) of fig. 16, it can be seen that the field curvature and distortion are small, and the imaging quality is good; referring to fig. 17, it can be seen that the total field of view is greater than 98%, and the overall brightness uniformity of the picture is high; referring to fig. 18, it can be seen that the aberration is small and the imaging quality is good.
In this embodiment, the focal length f of the optical imaging lens is 7.6 mm; the f-number FNO is 1.2; field angle FOV is 25 °; the size of the image surface is 1/2.8 inches; the distance TTL between the object-side surface 11 of the first lens element 1 and the image plane 6 on the optical axis I is 18.30 mm.
Example four
As shown in fig. 19, 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 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 curve chart of the present embodiment is shown in detail in fig. 20, and the focal shift curve chart is shown in detail in fig. 21, so that the MTF value of the spatial frequency of 20lp/mm is greater than 0.5 when in use, which meets the requirement of image definition and has good uniformity; as for the field curvature and distortion images, see (a) and (B) of fig. 22, it can be seen that the field curvature and distortion are small, and the imaging quality is good; referring to fig. 23, it can be seen that the total field of view is greater than 98%, and the overall brightness uniformity of the picture is high; referring to fig. 24, it can be seen that the aberration is small and the imaging quality is good.
In this embodiment, the focal length f of the optical imaging lens is 7.6 mm; the f-number FNO is 1.2; field angle FOV is 25 °; the size of the image surface is 1/2.8 inches; the distance TTL between the object side surface 11 of the first lens element 1 and the imaging surface 6 on the optical axis I is 19.53 mm.
EXAMPLE five
As shown in fig. 25, the surface convexities and concavities and refractive indexes of the lenses of the present embodiment are substantially the same as those of the first embodiment, only the image-side surface 42 of the fourth lens element 4 is a convex surface, and the optical parameters such as the curvature radius of the lens surface 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 curve chart of the present embodiment is shown in detail in fig. 26, and the focal shift curve chart is shown in detail in fig. 27, it can be seen that the MTF value of the spatial frequency of 20lp/mm is greater than 0.5 when in use, which meets the requirement of image definition and has good uniformity; referring to fig. 28 (a) and (B), it can be seen that the field curvature and distortion are small, and the imaging quality is good; referring to fig. 29, it can be seen that the total field of view is greater than 98%, and the overall brightness uniformity of the picture is high; referring to fig. 30, it can be seen that the aberration is small and the imaging quality is good.
In this embodiment, the focal length f of the optical imaging lens is 7.6 mm; the f-number FNO is 1.2; field angle FOV is 25 °; the size of the image surface is 1/2.8 inches; the distance TTL between the object side surface 11 of the first lens element 1 and the imaging surface 6 on the optical axis I is 18.46 mm.
Table 6 values of relevant important parameters of five embodiments of the present invention
Wherein, T1 to 1 ratioThe ratio of the thickness of the edge of the lens to the thickness of the center of the lens of the first lens 1; t is2 to 2 ratioThe ratio of the thickness of the edge of the lens of the second lens 2 to the thickness of the center of the lens; t is3 ratio ofMirror as third lens 3The ratio of the thickness of the edge of the lens to the thickness of the center of the lens; t is4 ratioIs the ratio of the thickness of the edge of the lens to the thickness of the center of the lens of the fourth lens 4.
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 (7)
1. An optical imaging lens characterized in that: the lens comprises a first lens, a second lens, a diaphragm, a third lens and a fourth lens from the object side to the image side along an optical axis in sequence; the first lens, the second lens, the third lens and the fourth lens are respectively provided with an object side surface facing the object side and allowing the imaging light to pass through and an image side surface facing the image side and allowing the imaging light to pass through;
the first lens element with positive 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 planar object-side surface and a convex image-side surface;
the fourth lens element with positive refractive index has a convex object-side surface;
the first lens to the fourth lens are all glass lenses, the ratio of the thickness of the edge of the lens to the thickness of the center of the lens of the first lens, the third lens and the fourth lens is 0.4-0.8, the ratio of the thickness of the edge of the lens to the thickness of the center of the lens of the second lens is 2.2-2.9, and the requirements are met: 1.67< nd1, 1.75< nd3 and 1.7< nd4, where nd1 is the refractive index of the first lens, nd3 is the refractive index of the third lens, and nd4 is the refractive index of the fourth lens;
the optical imaging lens has only the first lens to the fourth lens with the refractive index.
2. The optical imaging lens of claim 1, further satisfying: 1< | f1/f | <3, 0< | f2/f | <3, 1< | f3/f | <3, and 1< | f4/f | <3, wherein f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, f4 is the focal length of the fourth lens, and f is the focal length of the optical imaging lens.
3. The optical imaging lens of claim 2, further satisfying: 10mm < f1<22mm, -8mm < f2< -5mm, 7mm < f3<11mm and 10mm < f4<15mm, wherein f1 is the focal length of the first lens, f2 is the focal length of the second lens, f3 is the focal length of the third lens, and f4 is the focal length of the fourth lens.
4. The optical imaging lens according to claim 1, characterized in that: and antireflection films with the wavelength of 900nm are plated on the object side surfaces and the image side surfaces of the first lens, the second lens and the fourth lens.
5. The optical imaging lens of claim 1, further satisfying: 7mm < R11<15mm, 30mm < R12<62mm, -8mm < R21< -5mm, 13mm < R22<17mm, -10mm < R32< -7mm, 7mm < R41<10mm, wherein R11, R21, and R41 are radii of curvature of object-side surfaces of the first lens, the second lens, and the fourth lens, and R12, R22, and R32 are radii of curvature of image-side surfaces of the first lens, the second lens, and the third lens, respectively.
6. The optical imaging lens of claim 1, further satisfying: 1.67< nd1<1.9, 20< vd1< 56; 1.5< nd2<1.76, 35< vd2<57, 1.75< nd3<2.0, 20< vd3<48, 1.7< nd4<1.93, 20< vd4<40, where nd1, nd2, nd3, and nd4 are refractive indices of the first to fourth lenses, respectively, and vd1, vd2, vd3, and vd4 are abbe numbers of the first to fourth lenses, respectively.
7. The optical imaging lens of claim 1, further satisfying: 0.6< (D11/R11) <1.2, 0.1< (D12/R12) <0.7, 0.7< | (D21/R21) | <1.1, 0.1< (D22/R22) <0.7, 1< | (D32/R32) | <1.3, 0.8< (D32/R32) ≦ 1.2, 0.01< | (D32/R32) ≦ 0.5, wherein D32, D32 and D32 are respectively an object-side surface of the first lens, an image-side surface of the first lens, an object-side surface of the second lens, an image-side surface of the second lens, an object-side surface of the third lens, an object-side surface of the fourth lens, an object-side surface of the third lens, an object-side surface of the second lens, an object side surface of the third lens, an object side surface of the second lens, an object side surface of the third lens, an object side surface of the fourth lens, an object side surface of the third lens, an object side surface of the second lens, an object side surface of the third lens, a second lens, an object, A radius of curvature of an object-side surface of the fourth lens and an image-side surface of the fourth lens.
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| CN111694133A (en) * | 2020-07-23 | 2020-09-22 | 厦门力鼎光电股份有限公司 | Optical imaging lens |
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