CN111367054A - Small high-definition optical imaging lens - Google Patents

Small high-definition optical imaging lens Download PDF

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Publication number
CN111367054A
CN111367054A CN202010314807.8A CN202010314807A CN111367054A CN 111367054 A CN111367054 A CN 111367054A CN 202010314807 A CN202010314807 A CN 202010314807A CN 111367054 A CN111367054 A CN 111367054A
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China
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lens
optical imaging
lens element
image
refractive index
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Chinese (zh)
Inventor
上官秋和
刘青天
李雪慧
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Xiamen Leading Optics Co Ltd
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Xiamen Leading Optics Co Ltd
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Priority to CN202010314807.8A priority Critical patent/CN111367054A/en
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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
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
    • G02B1/041—Lenses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/0055—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element
    • G02B13/006—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras employing a special optical element at least one element being a compound optical element, e.g. cemented elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B13/00—Optical objectives specially designed for the purposes specified below
    • G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
    • G02B13/008—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras designed for infrared light

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  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
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Abstract

The invention relates to the technical field of lenses. The invention discloses a small high-definition optical imaging lens which sequentially comprises a first lens, a second lens, a third lens and a fourth lens from an object side to an image side along an optical axis; the first lens is a convex-concave lens with negative refractive index; the second lens element has positive refractive index and a convex image-side surface; the third lens and the fifth lens are convex lenses with positive refraction; the fourth lens is a concave lens with negative refractive index; the second lens, the fourth lens and the fifth lens are all plastic aspheric lenses, and the first lens and the third lens are all made of glass materials. The invention has the advantages of small temperature drift; the high-low temperature field curvature is small, the consistency of the definition from the center to the edge is ensured, and stray light is improved and avoided; the chromatic aberration is small; the day and night confocality is good; high imaging quality.

Description

Small high-definition optical imaging lens
Technical Field
The invention belongs to the technical field of lenses, and particularly relates to a small high-definition optical imaging 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 the optical imaging lenses are widely applied to various fields such as smart phones, tablet computers, video conferences, vehicle-mounted monitoring, security monitoring, unmanned aerial vehicle aerial photography and the like, so that the requirements on the optical imaging lenses are higher and higher.
However, the conventional glass-plastic mixed optical imaging lens has many defects, such as great difficulty in temperature drift control, serious coke leakage in severe working environments such as high and low temperature, and the like, and poor image quality; the field curvature is easy to occur at high and low temperatures, so that the edge of the lens is blurred even if the center is clear in a high and low temperature working environment, and the definition is damaged; stray light is obvious under strong light, and the imaging effect and the picture purity are influenced; purple edges, color cast and the like are easy to appear; the confocal performance is poor when the color difference is good, and the two are contradictory, so that the confocal performance is improved to meet the increasing requirements of consumers.
Disclosure of Invention
The invention aims to provide a small high-definition optical imaging lens to solve the technical problems.
In order to achieve the purpose, the invention adopts the technical scheme that: a small high-definition 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, 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 positive refractive index has a convex image-side surface;
the third lens element with positive refractive index has a convex object-side surface and a convex 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 second lens, the fourth lens and the fifth lens are all plastic aspheric lenses, and the first lens and the third lens are all made of glass materials;
the optical imaging lens has only the first lens to the fifth lens with the refractive index.
Further, the optical imaging lens further satisfies: | f1/f | <1.5, wherein f1 is the focal length of the first lens element, and f is the focal length of the optical imaging lens.
Further, the optical imaging lens further satisfies: 0.8< | f3/f5 | <1.2, wherein f3 is the focal length of the third lens element, and f5 is the focal length of the fifth lens element.
Further, the optical imaging lens further satisfies: | f4/f5 | <1, wherein f4 is the focal length of the fourth lens element, and f5 is the focal length of the fifth lens element.
Further, the optical imaging lens further satisfies: vd3 > 50, where vd3 is the abbe number of the third lens.
Further, the object-side surface of the fourth lens element is concave, and | R41 | < 60mm, where R41 is the radius of curvature of the object-side surface of the fourth lens element.
Further, the optical imaging lens further satisfies: vd5 is more than 50, vd4 is less than 30, wherein vd4 is the abbe number of the fourth lens, and vd5 is the abbe number of the fifth lens.
Further, the fourth lens and the fifth lens bear directly or are glued with each other.
Furthermore, the infrared ray lamp also comprises an infrared cut-off filter used in a visible light mode and a white sheet used in an infrared light mode, wherein the thicknesses of the infrared cut-off filter and the white sheet are not equal.
Further, the difference in thickness between the infrared cut filter and the white piece was 0.09 mm.
The invention has the beneficial technical effects that:
the invention adopts five lenses, glass and plastic are mixed, and through correspondingly designing each lens, high and low temperature can not generate focus, and high definition image output can be obtained; the high and low temperature field curvature is reduced, and the consistency of the definition from the center to the edge is ensured; stray light is improved and avoided; low chromatic aberration, good day and night confocal performance; miniaturization and low cost.
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 an MTF graph of visible light 435-656nm according to the first embodiment of the present invention;
FIG. 3 is a graph of MTF at 850nm for infrared light according to a first embodiment of the present invention;
FIG. 4 is a schematic diagram of a chromatic aberration curve according to a first embodiment of the present invention;
FIG. 5 is a defocus plot of 60lp/mm in visible light 435-;
FIG. 6 is a defocus plot of 60lp/mm in visible light 435-650nm at low temperature (-30 deg.C) in accordance with the first embodiment of the present invention;
FIG. 7 is a defocus plot of 60lp/mm in visible light 435-650nm at high temperature (85 ℃) in the first embodiment of the present invention;
FIG. 8 is a schematic structural diagram according to a second embodiment of the present invention;
FIG. 9 is an MTF graph of visible light 435-656nm according to the second embodiment of the present invention;
FIG. 10 is a graph of the MTF at 850nm of infrared light according to a second embodiment of the present invention;
FIG. 11 is a schematic diagram of a color difference curve according to a second embodiment of the present invention;
FIG. 12 is a defocus plot of 60lp/mm in visible light 435-;
FIG. 13 is a defocus plot of 60lp/mm in visible light 435-650nm at low temperature (-30 deg.C) in example two of the present invention;
FIG. 14 is a defocus plot of 60lp/mm in visible light 435-650nm at high temperature (85 ℃) in example two of the present invention;
FIG. 15 is a schematic structural diagram of a third embodiment of the present invention;
FIG. 16 is an MTF graph of visible light 435-656nm according to a third embodiment of the present invention;
FIG. 17 is a graph of MTF at 850nm for infrared light in accordance with a third embodiment of the present invention;
FIG. 18 is a schematic diagram of a color difference curve according to a third embodiment of the present invention;
FIG. 19 is a defocus plot of 60lp/mm in visible light 435-;
FIG. 20 is a defocus plot of 60lp/mm in visible light 435-650nm at low temperature (-30 deg.C) of example III of the present invention;
FIG. 21 is a defocus plot of 60lp/mm in visible light 435-650nm at high temperature (85 ℃) in example III of the present invention;
FIG. 22 is a schematic structural diagram according to a fourth embodiment of the present invention;
FIG. 23 is an MTF graph of visible light 435-656nm according to a fourth embodiment of the present invention;
FIG. 24 is an MTF plot of infrared light at 850nm according to a fourth embodiment of the present invention;
FIG. 25 is a schematic view of a color difference curve according to a fourth embodiment of the present invention;
FIG. 26 is a defocus plot of 60lp/mm in visible light 435-;
FIG. 27 is a defocus plot of 60lp/mm in visible light 435-650nm at low temperature (-30 deg.C) of example four of the present invention; FIG. 28 is a defocus plot of 60lp/mm in visible light 435-650nm at high temperature (85 ℃) in example four of the present invention;
Detailed Description
To further illustrate the various embodiments, the invention provides the accompanying drawings. The accompanying drawings, which are incorporated in and constitute a part of this disclosure, illustrate embodiments of the invention and, together with the description, serve to explain the principles of the embodiments. Those skilled in the art will appreciate still other possible embodiments and advantages of the present invention with reference to these figures. Elements in the figures are not drawn to scale and like reference numerals are generally used to indicate like elements.
The invention will now be further described with reference to the accompanying drawings and detailed description.
The term "a lens element having positive refractive index (or negative refractive index)" means that the paraxial refractive index of the lens element calculated by Gaussian optics theory is positive (or negative). The term "object-side (or image-side) of a lens" is defined as the specific range of imaging light rays passing through the lens surface. The determination of the surface shape of the lens can be performed by the judgment method of a person skilled in the art, i.e., by the sign of the curvature radius (abbreviated as R value). The R value may be commonly used in optical design software, such as Zemax or CodeV. The R value is also commonly found in lens data sheets (lens data sheets) of optical design software. When the R value is positive, the object side is judged to be a convex surface; and when the R value is negative, judging that the object side surface is a concave surface. On the contrary, regarding the image side surface, when the R value is positive, the image side surface is judged to be a concave surface; when the R value is negative, the image side surface is judged to be convex.
The invention discloses a small high-definition optical imaging lens which sequentially comprises a first lens, a second lens, a third lens and a fourth lens from an object side to an image side along an optical axis; the first lens element to the fifth 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 has a positive refractive index and a convex image-side surface.
The third lens element with positive refractive power has a convex object-side surface and a convex 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 second lens, the fourth lens and the fifth lens are all plastic aspheric lenses, the first lens and the third lens are made of glass materials, 2 glass lenses are matched with 3 plastic lenses, the first lens is made of glass lenses, hardness is high, the lens can be protected, high optical performance is guaranteed, and cost is greatly controlled.
The optical imaging lens has only the first lens to the fifth lens with the refractive index.
The invention adopts five lenses, glass and plastic are mixed, and through correspondingly designing each lens, high and low temperature can not generate focus, and high definition image output can be obtained; the high and low temperature field curvature is reduced, and the consistency of the definition from the center to the edge is ensured; stray light is improved and avoided; low chromatic aberration, good day and night confocal performance; miniaturization and low cost.
Preferably, the optical imaging lens further satisfies: | f1/f | <1.5, wherein f1 is the focal length of the first lens element, and f is the focal length of the optical imaging lens, further controlling the back focus offset at high and low temperatures.
Preferably, the optical imaging lens further satisfies: 0.8< | f3/f5 | <1.2, wherein f3 is the focal length of the third lens, and f5 is the focal length of the fifth lens, further controlling the back focal length shift at high and low temperatures.
Preferably, the optical imaging lens further satisfies: | f4/f5 | <1, wherein f4 is the focal length of the fourth lens element, and f5 is the focal length of the fifth lens element, further controlling the back focus offset at high and low temperatures.
Preferably, the optical imaging lens further satisfies: vd3 > 50, where vd3 is the abbe number of the third lens, further achromatized.
Preferably, the object-side surface of the fourth lens is concave, and | R41 | < 60mm, where R41 is the radius of curvature of the object-side surface of the fourth lens, controls the reflection between the lenses and avoids the occurrence of severe ghost images.
Preferably, the optical imaging lens further satisfies: vd5 is more than 50, vd4 is less than 30, wherein vd4 is the abbe number of the fourth lens, and vd5 is the abbe number of the fifth lens, and the chromatic aberration is further optimized.
Preferably, the fourth lens and the fifth lens are directly supported or mutually glued, so that tolerance sensitivity of the lens can be greatly reduced, and mass production is facilitated.
Preferably, the infrared image processing device further comprises an infrared cut-off filter used in the visible light mode and a white sheet used in the infrared light mode, wherein the thicknesses of the infrared cut-off filter and the white sheet are unequal, and infrared back focal offset is compensated, so that the visible light and the infrared light can achieve high-definition image quality at the same time.
More preferably, the thickness difference between the infrared cut-off filter and the white film is 0.09mm, so that infrared back focal offset is better compensated, and visible light and infrared light can simultaneously achieve high-definition image quality.
The small high-definition optical imaging lens of the present invention will be described in detail with specific embodiments.
Example one
As shown in fig. 1, a compact high-definition optical imaging lens includes, in order from an object side a1 to an image side a2 along an optical axis I, a first lens 1, a second lens 2, a stop 6, a third lens 3, a fourth lens 4, a fifth lens 5, a switching sheet 7, and an imaging surface 8; the first lens element 1 to the fifth lens element 5 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 positive refractive index, the object-side surface 21 of the second lens element 2 is convex, and the image-side surface 22 of the second lens element 2 is convex, although in other embodiments, the object-side surface 21 of the second lens element 2 may be planar or concave; the object-side surface 21 and the image-side surface 22 of the second lens element 2 are both aspheric.
The third lens element 3 has a positive 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 convex.
The fourth lens element 4 has a negative refractive index, the object-side surface 41 of the fourth lens element 4 is concave, the image-side surface 42 of the fourth lens element 4 is concave, and both the object-side surface 41 and the image-side surface 42 of the fourth lens element 4 are aspheric.
The fifth lens element 5 has a positive refractive index, the object-side surface 51 of the fifth lens element 5 is convex, the image-side surface 52 of the fifth lens element 5 is convex, and both the object-side surface 51 and the image-side surface 52 of the fifth lens element 5 are aspheric.
The second lens 2, the fourth lens 4 and the fifth lens 5 are all made of plastic materials, and the first lens 1 and the third lens 3 are all made of glass materials.
In this embodiment, the diaphragm 6 is disposed between the second lens 2 and the third lens 3, so as to improve the overall performance, and of course, in other embodiments, the diaphragm 6 may be disposed at other suitable positions.
In this embodiment, the switching piece 7 includes an infrared cut filter for the visible light mode and a white piece for the infrared light mode, which are switched to each other, that is, the switching piece 7 is switched to the infrared cut filter in the daytime, and the switching piece 7 is switched to the white piece at night. The thickness of the infrared cut filter is 0.3mm, the thickness of the white piece is 0.21mm, and the difference in thickness between the infrared cut filter and the white piece is 0.09mm, but not limited thereto.
In this embodiment, the fourth lens element 4 and the fifth lens element 5 are directly supported.
The detailed optical data of this embodiment are shown in Table 1-1.
Table 1-1 detailed optical data for example one
Figure BDA0002459125880000061
In this embodiment, the object-side surface 21, the object-side surface 41, the object-side surface 51, the image-side surface 22, the image-side surface 42, and the image-side surface 52 are defined by the following aspheric curve formulas:
Figure BDA0002459125880000062
wherein:
z: depth of the aspheric surface (the vertical 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 optical axis of the aspheric surface);
c: curvature of aspheric vertex (the vertex curvature);
k: cone coefficient (Conic Constant);
Figure BDA0002459125880000063
radial distance (radial distance);
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 21 22 41 42 51 52
K＝ 0 2.6E+00 0 -3.9E+00 2.4E+00 0
a4＝ -2.98E-04 1.37E-03 -3.20E-02 -2.46E-02 -1.46E-02 4.60E-04
a6＝ 2.85E-04 2.39E-04 1.63E-02 1.91E-02 7.80E-03 -5.59E-04
a8＝ 5.59E-06 -3.16E-06 -7.36E-03 -7.15E-03 -1.31E-03 3.09E-04
a10＝ 1.49E-05 1.46E-05 2.04E-03 1.84E-03 2.29E-04 -6.15E-05
a12＝ 0 0 -3.04E-04 -2.90E-04 -5.96E-05 6.69E-06
a14＝ 0 0 1.81E-05 1.89E-05 5.93E-06 0
The MTF graphs of the specific embodiment are shown in detail in FIGS. 2 and 3, and it can be seen that under visible light and infrared light, high pixels are achieved, and the day and night confocal property is good; referring to fig. 4, it can be seen that the color difference is corrected well and purple fringing is not easy to occur; referring to fig. 5-7, it can be seen that, at different temperatures, the back focus offset is small, all within 10 μm, and no serious field curvature occurs at high and low temperatures, so as to ensure stable image output at high and low temperatures when used with a camera.
In this embodiment, the focal length f of the optical imaging lens is 2.9 mm; f, FNO 2.3; the field angle FOV is 140; the distance TTL ═ 16.4mm on the optical axis I from the object-side surface 11 of the first lens 1 to the image plane 8, | f1/f | -1.06; | f3/f5 | -0.94, and | f4/f5 | -0.82.
Example two
As shown in fig. 8, 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 object-side surface 21 of the second lens element 2 is a concave surface, and the optical parameters such as the curvature radius of the surface of each lens element and the thickness of the lens element are different.
The detailed optical data of this embodiment is shown in Table 2-1.
TABLE 2-1 detailed optical data for example two
Figure BDA0002459125880000071
Figure BDA0002459125880000081
For the detailed data of the parameters of each aspheric surface of this embodiment, refer to the following table:
surface of 21 22 41 42 51 52
K＝ 0 -9.4E-01 0 -4.3E+00 5.5E+00 0
a4＝ -5.78E-03 -1.32E-03 -2.60E-02 -1.51E-02 -1.14E-03 6.42E-03
a6＝ -1.98E-04 -1.51E-04 1.64E-02 2.39E-02 1.27E-02 -2.14E-04
a8＝ 1.60E-05 5.94E-05 -7.51E-03 -1.04E-02 -4.55E-03 7.50E-04
a10＝ -2.94E-06 -5.50E-06 2.12E-03 1.96E-03 3.07E-04 -2.80E-04
a12＝ 0 0 -3.07E-04 -8.01E-05 1.35E-04 3.78E-05
a14＝ 0 0 1.41E-05 -1.49E-05 0 0
The MTF graph of the present embodiment is detailed in fig. 9 and 10, and it can be seen that high pixels are achieved under visible light and infrared light, and the confocal property is good at day and night; referring to fig. 11, it can be seen that the color difference is corrected well and purple fringing is not easy to occur; referring to fig. 12-14, it can be seen that, at different temperatures, the back focus offset is small, all within 10 μm, and no serious field curvature occurs at high and low temperatures, so as to ensure stable image output at high and low temperatures when used with a camera.
In this embodiment, the focal length f of the optical imaging lens is 2.98 mm; f, FNO 2.3; the field angle FOV is 140; the distance TTL ═ 16.1mm from the object-side surface 11 of the first lens element 1 to the image plane 8 on the optical axis I, | f1/f | -1.31; | f3/f5 | -0.98, and | f4/f5 | -0.71.
EXAMPLE III
As shown in fig. 15, 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
Figure BDA0002459125880000082
Figure BDA0002459125880000091
For the detailed data of the parameters of each aspheric surface of this embodiment, refer to the following table:
surface of 21 22 41 42 51 52
K＝ 8.0E-02 -3.6E+00 -3.6E+00
a4＝ -1.77E-04 3.17E-03 -3.02E-02 -2.31E-02 -1.18E-02 -1.23E-03
a6＝ 5.70E-04 7.77E-04 1.49E-02 1.84E-02 7.53E-03 -1.59E-04
a8＝ -3.79E-05 -1.33E-04 -7.02E-03 -7.14E-03 -1.43E-03 1.32E-04
a10＝ 2.39E-05 6.41E-05 2.02E-03 1.83E-03 2.25E-04 -1.97E-05
a12＝ 0 0 -3.21E-04 -2.94E-04 -5.53E-05 2.34E-06
a14＝ 0 0.00E+00 2.11E-05 2.05E-05 6.01E-06 0
The MTF graph of this embodiment is detailed in fig. 16 and 17, and it can be seen that both high pixels are achieved under visible light and infrared light, and the confocal property is good day and night; referring to fig. 18, it can be seen that the color difference is corrected well and purple fringing is not easy to occur; referring to fig. 19-21, it can be seen that, at different temperatures, the back focus offset is small, all within 10 μm, and no serious field curvature occurs at high and low temperatures, so as to ensure stable image output at high and low temperatures when used with a camera.
In this embodiment, the focal length f of the optical imaging lens is 2.93 mm; f, FNO 2.3; the field angle FOV is 140; the distance TTL ═ 16.1mm from the object-side surface 11 of the first lens element 1 to the image plane 8 on the optical axis I, | f1/f | -1.05; | f3/f5 | -0.89, and | f4/f5 | -0.79.
Example four
As shown in fig. 22, 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 object-side surface 21 of the second lens element 2 is a concave surface, and the optical parameters such as the curvature radius of the surface of each lens element and the thickness of the lens element are different.
In the present embodiment, the fourth lens 4 and the fifth lens 5 are cemented to each other.
The detailed optical data of this embodiment is shown in Table 4-1.
TABLE 4-1 detailed optical data for example four
Figure BDA0002459125880000092
Figure BDA0002459125880000101
For the detailed data of the parameters of each aspheric surface of this embodiment, refer to the following table:
surface of 21 22 41 42 51 52
K＝ 7.8E+00 -3.3E+00 1.2E+01 -1.0E+00 -4.4E-01 7.8E+00
a4＝ -5.40E-03 5.38E-04 -6.95E-03 -2.53E-02 -2.06E-03 -5.40E-03
a6＝ 1.25E-03 1.31E-03 -1.01E-02 8.78E-03 -6.13E-04 1.25E-03
a8＝ -3.39E-04 5.16E-04 8.93E-03 -4.89E-03 2.11E-04 -3.39E-04
a10＝ 9.06E-05 -1.59E-04 -4.28E-03 2.32E-03 -6.49E-05 9.06E-05
a12＝ 2.43E-06 5.15E-05 1.10E-03 -6.39E-04 1.23E-05 2.43E-06
a14＝ -4.40E-06 -6.33E-06 -1.36E-04 9.06E-05 -1.38E-06 -4.40E-06
a16＝ 0 0 5.80E-06 -5.18E-06 6.70E-08 0
The MTF graphs of the present embodiment are shown in fig. 23 and 24 in detail, and it can be seen that high pixels are achieved under visible light and infrared light, and the confocal property is good at day and night; referring to fig. 25, it can be seen that the color difference is corrected well and purple fringing is not easy to occur; referring to fig. 26-28, it can be seen that, at different temperatures, the back focus offset is small, all within 10 μm, and no serious field curvature occurs at high and low temperatures, so as to ensure stable image quality output at high and low temperatures when used with a camera.
In this embodiment, the focal length f of the optical imaging lens is 2.90 mm; f, FNO 2.3; the field angle FOV is 140; the distance TTL ═ 16.1mm from the object-side surface 11 of the first lens element 1 to the image plane 8 on the optical axis I, | f1/f | -1.12; | f3/f5 | -1.08, and | f4/f5 | -0.96.
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. The utility model provides an optical imaging lens of small-size high definition which characterized in that: the lens comprises a first lens, a second lens, a third lens, a fourth lens, a fifth lens and a fourth lens, wherein the first lens, the second lens and the fifth lens are arranged 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 positive refractive index has a convex image-side surface;
the third lens element with positive refractive index has a convex object-side surface and a convex 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 second lens, the fourth lens and the fifth lens are all plastic aspheric lenses, and the first lens and the third lens are all made of glass materials;
the optical imaging lens has only the first lens to the fifth lens with the refractive index.
2. The small high-definition optical imaging lens according to claim 1, further satisfies the following conditions: | f1/f | <1.5, wherein f1 is the focal length of the first lens element, and f is the focal length of the optical imaging lens.
3. The small high-definition optical imaging lens according to claim 1, further satisfies the following conditions: 0.8< | f3/f5 | <1.2, wherein f3 is the focal length of the third lens element, and f5 is the focal length of the fifth lens element.
4. The small high-definition optical imaging lens according to claim 1, further satisfies the following conditions: | f4/f5 | <1, wherein f4 is the focal length of the fourth lens element, and f5 is the focal length of the fifth lens element.
5. The small high-definition optical imaging lens according to claim 1, further satisfies the following conditions: vd3 > 50, where vd3 is the abbe number of the third lens.
6. The small high-definition optical imaging lens according to claim 1, characterized in that: the object-side surface of the fourth lens element is concave, and | R41 | < 60mm, wherein R41 is the radius of curvature of the object-side surface of the fourth lens element.
7. The small high-definition optical imaging lens according to claim 1, further satisfies the following conditions: vd5 is more than 50, vd4 is less than 30, wherein vd4 is the abbe number of the fourth lens, and vd5 is the abbe number of the fifth lens.
8. The small high-definition optical imaging lens according to claim 1, characterized in that: the fourth lens and the fifth lens bear directly or are mutually glued.
9. The small high-definition optical imaging lens according to claim 1, characterized in that: the infrared ray detector also comprises an infrared cut-off filter used in a visible light mode and a white sheet used in an infrared light mode, wherein the thicknesses of the infrared cut-off filter and the white sheet are unequal.
10. The small high-definition optical imaging lens according to claim 9, characterized in that: the difference in thickness between the infrared cut filter and the white piece was 0.09 mm.
CN202010314807.8A 2020-04-21 2020-04-21 Small high-definition optical imaging lens Pending CN111367054A (en)

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