CN108398769A - Optical imaging lens - Google Patents
Optical imaging lens Download PDFInfo
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- CN108398769A CN108398769A CN201810538945.7A CN201810538945A CN108398769A CN 108398769 A CN108398769 A CN 108398769A CN 201810538945 A CN201810538945 A CN 201810538945A CN 108398769 A CN108398769 A CN 108398769A
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- lens
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- object side
- image side
- optical imaging
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/001—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras
- G02B13/0015—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design
- G02B13/002—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface
- G02B13/0045—Miniaturised objectives for electronic devices, e.g. portable telephones, webcams, PDAs, small digital cameras characterised by the lens design having at least one aspherical surface having five or more lenses
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B13/00—Optical objectives specially designed for the purposes specified below
- G02B13/18—Optical objectives specially designed for the purposes specified below with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration
Abstract
The invention discloses a kind of optical imaging lens, it is convex surface that the first lens, which have positive refracting power, object side,；It is convex surface at dipped beam axis that second lens, which have negative refracting power, object side,；It is convex surface that the third lens, which have refracting power, image side surface,；It is convex surface at dipped beam axis that 4th lens, which have positive refracting power, object side, and image side surface is convex surface at dipped beam axis；It is convex surface at dipped beam axis that 5th lens, which have negative refracting power, object side, and image side surface is concave surface at dipped beam axis.Each lens of this optical imaging lens can keep high image quality using rational face structure and the optimization range combinations of each optics of lens parameter.The relationship for wherein distributing the 4th focal length of lens and lens focus rationally is conducive to shorten camera lens entire length, therefore can shorten lens group length in the case where keeping high image quality to share the focal power of overall lens group, meets small and light requirement.
Description
Technical field
The present invention relates to optical imaging device technical fields, more particularly to a kind of optical imaging lens.
Background technology
In recent years, with the rapid development of electronic technology, movable light electronic device has obtained rapidly popularizing, such as
Present level universal smart mobile phone, tablet computer, automobile data recorder, moving camera etc..Movable light electronic device it is general
And so that its optical camera module applied is flourished.Meanwhile user wants movable light electronic device
It asks also higher and higher, constantly pursues more convenient and efficient and more good usage experience, this requires movable light electronics to fill
The photographing module used is set in the case where ensureing high-quality imaging to develop to lightening direction.
In the prior art, if carrying out lightening design for traditional quadruple lenses group structure, can cause in refracting power
Distribution, the correction of aberration astigmatism, susceptibility distribution etc. have limitation, cannot be satisfied the imaging demand of more high standard.
Invention content
The object of the present invention is to provide a kind of optical imaging lens, can shorten in the case where keeping high image quality thoroughly
Microscope group length meets small and light requirement.
To achieve the above object, the present invention provides the following technical solutions：
A kind of optical imaging lens include the first lens set gradually by object side to image side along optical axis, the second lens,
Three lens, the 4th lens and the 5th lens, wherein：
It is convex surface that first lens, which have positive refracting power, object side,；
It is convex surface at dipped beam axis that second lens, which have negative refracting power, object side,；
It is convex surface that the third lens, which have refracting power, image side surface,；
It is convex surface at dipped beam axis that 4th lens, which have positive refracting power, object side, and image side surface is at dipped beam axis
For convex surface；
It is convex surface at dipped beam axis that 5th lens, which have negative refracting power, object side, and image side surface is at dipped beam axis
For concave surface；
And it satisfies the following conditional expression：
1.0<CT4/ET4<1.8；
0.8<f4/f<1.4；
2.4<EA34/EA45<20；
Wherein, CT4Indicate thickness of the 4th lens on optical axis, ET4Indicate the edge thickness of the 4th lens,
f4Indicate that the focal length of the 4th lens, f indicate the focal length of the optical imaging lens, EA34Indicate the third lens edge
With the airspace distance between the 4th rims of the lens, EA45Indicate the 4th rims of the lens and the 5th lens side
Airspace distance between edge.
Preferably, the image side surface of first lens is concave surface at dipped beam axis, and the object side of the 4th lens has
At least one knee of curve.
Preferably, it also satisfies the following conditional expression：0.2<(R41+R42)/(R41-R42)<0.8, wherein R41Indicate the described 4th
The radius of curvature of lens object side, R42Indicate the radius of curvature of the 4th lens image side surface.
Preferably, it also satisfies the following conditional expression：1.0<CT3/ET3<1.5, wherein CT3Indicate the third lens in optical axis
On thickness, ET3Indicate the edge thickness of the third lens.
Preferably, it also satisfies the following conditional expression：1.0<(R31+R32)/(R31-R32)<2.0, wherein R31Indicate the third
The radius of curvature of lens object side, R32Indicate the radius of curvature of the third lens image side surface.
Preferably, it also satisfies the following conditional expression：0.2<(AG23+AG34)/ALT<0.4, wherein AG23Indicate described second thoroughly
Mirror and airspace of the third lens on optical axis, AG34Indicate the third lens with the 4th lens on optical axis
Airspace, ALT indicates distance of the first lens object side to the 4th lens image side surface on optical axis.
Preferably, it also satisfies the following conditional expression：2.0<f2/f5<6.0, wherein f2Indicate the focal length of second lens, f5
Indicate the focal length of the 5th lens.
Preferably, it also satisfies the following conditional expression：18.0<|f2|/CT2<30.0, wherein CT2Indicate that second lens exist
Thickness on optical axis.
Preferably, it also satisfies the following conditional expression：0.8<LCT14/LCT25<1.2, wherein LCT14Indicate first lens
Distance of the object side to the 4th lens image side surface on optical axis, LCT25Indicate the second lens object side to the described 5th
Distance of the lens image side surface on optical axis.
Preferably, it also satisfies the following conditional expression：0.4<f/(R51-R52)<0.8, wherein R51Indicate the 5th lens object
The radius of curvature of side, R52Indicate the radius of curvature of the 5th lens image side surface.
As shown from the above technical solution, a kind of optical imaging lens provided by the present invention, including along optical axis by object side extremely
The first lens, the second lens, the third lens, the 4th lens and the 5th lens that image side is set gradually, object space light pass through successively
Each lens are imaged onto on the imaging surface of the 5th lens image side.This optical imaging lens is five chip lens arrangements, each
Mirror can keep high image quality using rational face structure and the optimization range combinations of each optics of lens parameter.Its
In distribute the face shapes of the 4th lens rationally, include the relationship of its focal length and lens focus, with by the 4th lens share it is whole thoroughly
The focal power of microscope group is conducive to shorten camera lens entire length, and limits the third lens, the 4th lens and the 5th lens adjacent lens
It is spaced between edge, distributes each lens layout rationally, help to shorten camera lens entire length.Therefore, optical imaging lens of the present invention
Head can shorten lens group length in the case where keeping high image quality, meet small and light requirement.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
Obtain other attached drawings according to these attached drawings.
Fig. 1 is a kind of schematic diagram for optical imaging lens that first embodiment of the invention provides；
Fig. 2 is the perturbed field diagram of optical imaging lens in first embodiment of the invention；
Fig. 3 is the spherical aberration curve graph of optical imaging lens in first embodiment of the invention；
Fig. 4 is a kind of schematic diagram for optical imaging lens that second embodiment of the invention provides；
Fig. 5 is the perturbed field diagram of optical imaging lens in second embodiment of the invention；
Fig. 6 is the spherical aberration curve graph of optical imaging lens in second embodiment of the invention；
Fig. 7 is a kind of schematic diagram for optical imaging lens that third embodiment of the invention provides；
Fig. 8 is the perturbed field diagram of optical imaging lens in third embodiment of the invention；
Fig. 9 is the spherical aberration curve graph of optical imaging lens in third embodiment of the invention；
Figure 10 is a kind of schematic diagram for optical imaging lens that fourth embodiment of the invention provides；
Figure 11 is the perturbed field diagram of optical imaging lens in fourth embodiment of the invention；
Figure 12 is the spherical aberration curve graph of optical imaging lens in fourth embodiment of the invention.
Specific implementation mode
In order to make those skilled in the art more fully understand the technical solution in the present invention, below in conjunction with of the invention real
The attached drawing in example is applied, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described implementation
Example is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, this field is common
The every other embodiment that technical staff is obtained without making creative work, should all belong to protection of the present invention
Range.
The embodiment of the present invention provides a kind of optical imaging lens, includes first set gradually by object side to image side along optical axis
Lens, the second lens, the third lens, the 4th lens and the 5th lens, wherein：
It is convex surface that first lens, which have positive refracting power, object side,；
It is convex surface at dipped beam axis that second lens, which have refracting power, object side,；
It is convex surface that the third lens, which have refracting power, image side surface,；
It is convex surface at dipped beam axis that 4th lens, which have positive refracting power, object side, and image side surface is at dipped beam axis
For convex surface；
It is convex surface at dipped beam axis that 5th lens, which have negative refracting power, object side, and image side surface is at dipped beam axis
For concave surface；
And it satisfies the following conditional expression：
1.0<CT4/ET4<1.8；
0.8<f4/f<1.4；
2.4<EA34/EA45<20；
Wherein, CT4Indicate thickness of the 4th lens on optical axis, ET4Indicate the edge thickness of the 4th lens,
f4Indicate that the focal length of the 4th lens, f indicate the focal length of the optical imaging lens, EA34Indicate the third lens edge
With the airspace distance between the 4th rims of the lens, EA45Indicate the 4th rims of the lens and the 5th lens side
Airspace distance between edge.
It should be noted that refracting power, which refers to directional light, passes through optical system, deviation can occur for the direction of propagation of light, use
In characterization optical system to the flexion ability of incoming parallel beam.Optical system has positive refracting power, shows the flexion to light
It is convergence property；Optical system has negative refracting power, shows that the flexion of light be diversity.
Lens object side is that convex surface refers to that section is done at lens object side any point Guo Mianshang, and total surface is on the right side of section
Side, radius of curvature are that just, object side on the contrary is then concave surface, and radius of curvature is negative.Lens image side surface is that convex surface refers to lens
Image side surface crosses any point on face and does section, and total surface is on the left side of section, and radius of curvature is negative, otherwise image side surface is recessed
Face, radius of curvature are just.Lens object side, image side surface dipped beam axis at it is concave-convex judge still to be applicable in it is above-mentioned.
This optical imaging lens, object space light successively pass through the first lens, the second lens, the third lens, the 4th lens and
On 5th lens imaging to the imaging surface positioned at the 5th lens image side.
Wherein, it is convex surface that the first lens, which have positive refracting power, object side, can adjust positive refracting power distribution, contribute to
Shorten optical system total length.Second lens have negative refracting power, are conducive to correct the aberration that the first lens generate, object
Side is convex surface at dipped beam axis, helps to correct optical system non-dots astigmat, reinforces the amendment of off-axis aberration.Meniscus shape
The third lens can be guided effectively and draw high ray height.4th lens object side and image side surface are in biconvex knot at dipped beam axis
Structure can effectively correct paraxial spherical aberration, while reduce the astigmatism curvature of field on periphery.5th lens have negative refracting power, contribute to
The back focal length for shortening imaging lens group, maintains its miniaturization.
In this optical imaging system, the center thickness and edge thickness of the 4th lens meet 1.0<CT4/ET4<1.8, pass through
The middle webbing thickness rate value for controlling the 4th lens makes the lens meet preferable technological forming condition.Meanwhile the 4th lens also meet
0.8<f4/f<1.4, to share the focal power of overall lens group by the 4th lens, be conducive to shorten camera lens entire length.And
The third lens, the 4th lens and the 5th lens meet 2.4<EA34/EA45<20, by limiting the third lens, the 4th lens and the
It is spaced between five lens adjacent lens edges, distributes each lens layout rationally, help to shorten camera lens entire length.
Therefore the present embodiment optical imaging lens, can shorten lens group length in the case where keeping high image quality,
Meet small and light requirement.
In a preferred embodiment, the image side surface of first lens is concave surface at dipped beam axis, and the described 4th thoroughly
The object side of mirror has at least one knee of curve.If crossing any point on lens object side or image side surface does section, surface
The existing part on the section left side, and have the part on the right of section, then there are knee of curves on the surface.
Preferably, the present embodiment optical imaging lens also satisfy the following conditional expression：0.2<(R41+R42)/(R41-R42)<0.8,
Wherein, R41Indicate the radius of curvature of the 4th lens object side, R42Indicate the radius of curvature of the 4th lens image side surface.
By optimally adjusting the radius of curvature in the 4th each face of lens, so that the shape of the 4th lens is more smoothed out, be conducive to molding, contribute to
The amendment of the reinforcing section astigmatism curvature of field.
Preferably, the present embodiment optical imaging lens also satisfy the following conditional expression：1.0<CT3/ET3<1.5, wherein CT3Table
Show thickness of the third lens on optical axis, ET3Indicate the edge thickness of the third lens.By efficiently controlling third
Webbing is thick in lens, can effectively avoid the thickness of the third lens than excessive or too small problem, avoid being difficult to be molded production
Or molding is bad.
Preferably, the present embodiment optical imaging lens also satisfy the following conditional expression：1.0<(R31+R32)/(R31-R32)<2.0
Wherein, R31Indicate the radius of curvature of the third lens object side, R32Indicate the radius of curvature of the third lens image side surface.
Preferably to configure the face structure of the third lens in favor of aberration correction.
Preferably, the present embodiment optical imaging lens also satisfy the following conditional expression：0.2<(AG23+AG34)/ALT<0.4,
In, AG23Indicate second lens and airspace of the third lens on optical axis, AG34Indicate the third lens with
Airspace of 4th lens on optical axis, ALT indicate the first lens object side to the 5th lens image side surface
Distance on optical axis.By distributing airspace between the second lens, the third lens and the 4th lens rationally, preferred arrangement is each
Lens are distributed, and the spacing between lens can be made to be in optimal balance point with aberration balancing, keep overall structure compacter.
Preferably, the present embodiment optical imaging lens also satisfy the following conditional expression：2.0<f2/f5<6.0, wherein f2It indicates
The focal length of second lens, f5Indicate the focal length of the 5th lens.Effectively to distribute the refracting power of two lens, avoid a
Other eyeglass occur refracting power it is excessive or cross minor issue, reduce the susceptibility of lens.
Preferably, the present embodiment optical imaging lens also satisfy the following conditional expression：18.0<|f2|/CT2<30.0, wherein
CT2Indicate thickness of second lens on optical axis.The second lens refracting power and thickness can be made moderate.
Preferably, the present embodiment optical imaging lens also satisfy the following conditional expression：0.8<LCT14/LCT25<1.2, wherein
LCT14Indicate distance of the first lens object side to the 4th lens image side surface on optical axis, LCT25Indicate described
Distance of the two lens object sides to the 5th lens image side surface on optical axis.To regulate and control the space layout of overall lens group, make
Optical system structure is compact, miniaturization.
Preferably, the present embodiment optical imaging lens also satisfy the following conditional expression：0.4<f/(R51-R52)<0.8, wherein
R51Indicate the radius of curvature of the 5th lens object side, R52Indicate the radius of curvature of the 5th lens image side surface.To last
The radius of curvature of a piece of lens adjusts, and to shorten coke after optical system, is conducive to minimize.
Optical imaging lens of the present invention are described in detail with specific embodiment below.
Referring to FIG. 1, the schematic diagram of the optical imaging lens provided for first embodiment of the invention.As seen from the figure, this reality
It includes that the first lens 11, the second lens 12, third that are set gradually by object side to image side along optical axis are saturating to apply an optical imaging lens
Mirror 13, the 4th lens 14 and the 5th lens 15.
It is convex surface that first lens 11, which have positive refracting power, object side,.
It is convex surface at dipped beam axis that second lens 12, which have negative refracting power, object side,.
It is convex surface that the third lens 13, which have refracting power, image side surface,.
It is convex surface at dipped beam axis that 4th lens 14, which have positive refracting power, object side, and image side surface is in dipped beam axis
Place is convex surface.
It is convex surface at dipped beam axis that 5th lens 15, which have negative refracting power, object side, and image side surface is in dipped beam axis
Place is concave surface.
The value of each conditional expression is as shown in the table in the present embodiment：
The present embodiment optical imaging lens are provided with aperture 10 in 11 object side of the first lens.In the 5th lens 15 and imaging surface
Between be provided with infrared fileter 16, filtered out into the infrared band light in optical lens group, avoided by infrared fileter 16
Noise is generated on Infrared irradiation to sensitive chip.Optional optical filter material is glass and does not influence focal length.
The structural parameters of each lens of the present embodiment optical imaging lens are specific as shown in table 1-1, focal length f=3.83mm,
F-number Fno=2.07, field angle FOV=81.6 degree.The unit of table mean curvature radius, thickness and focal length is mm, and surface 1-
14 indicate successively by each surface in object side to image side, and wherein surface 1-11 indicates aperture, the first lens object side, the first lens successively
Image side surface, the second lens object side, the second lens image side surface, the third lens object side, the third lens image side surface, the 4th lens object
Side, the 4th lens image side surface, the 5th lens object side and the 5th lens image side surface.
Table 1-1
Each lens use aspheric design, aspherical fitting equation to indicate as follows in this optical imaging system：Wherein, X indicates aspherical upper distance
Optical axis is the point of Y, with the relative altitude for being tangential on the section on vertex on aspherical optical axis；R indicates radius of curvature；Y indicates non-
The vertical range of point and optical axis on spherical curve；K indicates conical surface coefficient；Ai indicates the i-th rank asphericity coefficient.
The asphericity coefficient of each lens of the present embodiment is specific as shown in table 1-2, and A4-A20 indicates lens surface 4- respectively
20 rank asphericity coefficients.
The perturbed field curve graph and spherical aberration curve graph difference of the present embodiment optical lens group design are as shown in Figures 2 and 3,
Wherein perturbed field curve graph design wavelength is 0.555 μm, and spherical aberration curve graph design wavelength is 0.470 μm, 0.510 μm, 0.555 μ
M, 0.610 μm and 0.650 μm.
Referring to FIG. 4, the schematic diagram of the optical imaging lens provided for second embodiment of the invention.As seen from the figure, this reality
It includes that the first lens 21, the second lens 22, third that are set gradually by object side to image side along optical axis are saturating to apply an optical imaging lens
Mirror 23, the 4th lens 24 and the 5th lens 25.
It is convex surface that first lens 21, which have positive refracting power, object side,.
It is convex surface at dipped beam axis that second lens 22, which have negative refracting power, object side,.
It is convex surface that the third lens 23, which have refracting power, image side surface,.
It is convex surface at dipped beam axis that 4th lens 24, which have positive refracting power, object side, and image side surface is in dipped beam axis
Place is convex surface.
It is convex surface at dipped beam axis that 5th lens 25, which have negative refracting power, object side, and image side surface is in dipped beam axis
Place is concave surface.
The value of each conditional expression is as shown in the table in the present embodiment：
The present embodiment optical imaging lens are provided with aperture 20 in 21 object side of the first lens.In the 5th lens 25 and imaging surface
Between be provided with infrared fileter 26, filtered out into the infrared band light in optical lens group, avoided by infrared fileter 26
Noise is generated on Infrared irradiation to sensitive chip.Optional optical filter material is glass and does not influence focal length.
The structural parameters of each lens of the present embodiment optical imaging lens are specific as shown in table 2-1, focal length f=3.52mm,
F-number Fno=2.08, field angle FOV=83.6 degree.The unit of table mean curvature radius, thickness and focal length is mm, and surface 1-
14 indicate successively by each surface in object side to image side, and wherein surface 1-11 indicates aperture, the first lens object side, the first lens successively
Image side surface, the second lens object side, the second lens image side surface, the third lens object side, the third lens image side surface, the 4th lens object
Side, the 4th lens image side surface, the 5th lens object side and the 5th lens image side surface.
Table 2-1
The asphericity coefficient of each lens of the present embodiment is specific as shown in table 2-2, and A4-A20 indicates lens surface 4- respectively
20 rank asphericity coefficients.
The perturbed field curve graph and spherical aberration curve graph difference of the present embodiment optical lens group design are as shown in Figure 5 and Figure 6,
Wherein perturbed field curve graph design wavelength is 0.555 μm, and spherical aberration curve graph design wavelength is 0.470 μm, 0.510 μm, 0.555 μ
M, 0.610 μm and 0.650 μm.
Referring to FIG. 7, the schematic diagram of the optical imaging lens provided for third embodiment of the invention.As seen from the figure, this reality
It includes that the first lens 31, the second lens 32, third that are set gradually by object side to image side along optical axis are saturating to apply an optical imaging lens
Mirror 33, the 4th lens 34 and the 5th lens 35.
It is convex surface that first lens 31, which have positive refracting power, object side,.
It is convex surface at dipped beam axis that second lens 32, which have negative refracting power, object side,.
It is convex surface that the third lens 33, which have refracting power, image side surface,.
It is convex surface at dipped beam axis that 4th lens 34, which have positive refracting power, object side, and image side surface is in dipped beam axis
Place is convex surface.
It is convex surface at dipped beam axis that 5th lens 35, which have negative refracting power, object side, and image side surface is in dipped beam axis
Place is concave surface.
The value of each conditional expression is as shown in the table in the present embodiment：
The present embodiment optical imaging lens are provided with aperture 30 in 31 object side of the first lens.In the 5th lens 35 and imaging surface
Between be provided with infrared fileter 36, filtered out into the infrared band light in optical lens group, avoided by infrared fileter 36
Noise is generated on Infrared irradiation to sensitive chip.Optional optical filter material is glass and does not influence focal length.
The structural parameters of each lens of the present embodiment optical imaging lens are specific as shown in table 3-1, focal length f=3.78mm,
F-number Fno=2.08, field angle FOV=82.5 degree.The unit of table mean curvature radius, thickness and focal length is mm, and surface 1-
14 indicate successively by each surface in object side to image side, and wherein surface 1-11 indicates aperture, the first lens object side, the first lens successively
Image side surface, the second lens object side, the second lens image side surface, the third lens object side, the third lens image side surface, the 4th lens object
Side, the 4th lens image side surface, the 5th lens object side and the 5th lens image side surface.
Table 3-1
The asphericity coefficient of each lens of the present embodiment is specific as shown in table 3-2, and A4-A20 indicates lens surface 4- respectively
20 rank asphericity coefficients.
The perturbed field curve graph and spherical aberration curve graph difference of the present embodiment optical lens group design are as shown in Figure 8 and Figure 9,
Wherein perturbed field curve graph design wavelength is 0.555 μm, and spherical aberration curve graph design wavelength is 0.470 μm, 0.510 μm, 0.555 μ
M, 0.610 μm and 0.650 μm.
Referring to FIG. 10, the schematic diagram of the optical imaging lens provided for fourth embodiment of the invention.As seen from the figure, this reality
It includes that the first lens 41, the second lens 42, third that are set gradually by object side to image side along optical axis are saturating to apply an optical imaging lens
Mirror 43, the 4th lens 44 and the 5th lens 45.
It is convex surface that first lens 41, which have positive refracting power, object side,.
It is convex surface at dipped beam axis that second lens 42, which have negative refracting power, object side,.
It is convex surface that the third lens 43, which have refracting power, image side surface,.
It is convex surface at dipped beam axis that 4th lens 44, which have positive refracting power, object side, and image side surface is in dipped beam axis
Place is convex surface.
It is convex surface at dipped beam axis that 5th lens 45, which have negative refracting power, object side, and image side surface is in dipped beam axis
Place is concave surface.
The value of each conditional expression is as shown in the table in the present embodiment：
The present embodiment optical imaging lens are provided with aperture 40 in 41 object side of the first lens.In the 5th lens 45 and imaging surface
Between be provided with infrared fileter 46, filtered out into the infrared band light in optical lens group, avoided by infrared fileter 46
Noise is generated on Infrared irradiation to sensitive chip.Optional optical filter material is glass and does not influence focal length.
The structural parameters of each lens of the present embodiment optical imaging lens are specific as shown in table 4-1, focal length f=3.429mm,
F-number Fno=2.08, field angle FOV=81 degree.The unit of table mean curvature radius, thickness and focal length is mm, and surface 1-14
It is indicated successively by each surface in object side to image side, wherein surface 1-11 indicates aperture, the first lens object side, the first lens picture successively
Side, the second lens object side, the second lens image side surface, the third lens object side, the third lens image side surface, the 4th lens object side
Face, the 4th lens image side surface, the 5th lens object side and the 5th lens image side surface.
Table 4-1
The asphericity coefficient of each lens of the present embodiment is specific as shown in table 4-2, and A4-A20 indicates lens surface 4- respectively
20 rank asphericity coefficients.
The perturbed field curve graph and spherical aberration curve graph of the present embodiment optical lens group design are respectively such as Figure 11 and Figure 12 institutes
Show, wherein perturbed field curve graph design wavelength be 0.555 μm, spherical aberration curve graph design wavelength be 0.470 μm, 0.510 μm,
0.555 μm, 0.610 μm and 0.650 μm.
Optical imaging lens of the present invention use five aspherical lens structure, using suitable face type, higher order it is non-
Asphere coefficient effectively corrects all kinds of aberrations such as the curvature of field, astigmatism, ratio chromatism,.There is preferably thin and thick ratio simultaneously, it is preferable sensitive
Degree improves process rate, reduces production cost.
The present invention uses plastic material, has the characteristics that accurate die pressing using plastic material, realizes batch production, in this way may be used
The processing cost of optical element is greatly lowered, so that the cost of optical system significantly declines to push away on a large scale
Extensively.
Optical imaging lens provided by the present invention are described in detail above.Specific case pair used herein
The principle of the present invention and embodiment are expounded, and the explanation of above example is only intended to help to understand method of the invention
And its core concept.It should be pointed out that for those skilled in the art, before not departing from the principle of the invention
It puts, can be with several improvements and modifications are made to the present invention, these improvement and modification also fall into the guarantor of the claims in the present invention
It protects in range.
Claims (10)
1. a kind of optical imaging lens, which is characterized in that include the first lens set gradually by object side to image side along optical axis,
Two lens, the third lens, the 4th lens and the 5th lens, wherein：
It is convex surface that first lens, which have positive refracting power, object side,；
It is convex surface at dipped beam axis that second lens, which have negative refracting power, object side,；
It is convex surface that the third lens, which have refracting power, image side surface,；
It is convex surface at dipped beam axis that 4th lens, which have positive refracting power, object side, and image side surface is convex at dipped beam axis
Face；
It is convex surface at dipped beam axis that 5th lens, which have negative refracting power, object side, and image side surface is recessed at dipped beam axis
Face；
And it satisfies the following conditional expression：
1.0<CT4/ET4<1.8；
0.8<f4/f<1.4；
2.4<EA34/EA45<20；
Wherein, CT4Indicate thickness of the 4th lens on optical axis, ET4Indicate the edge thickness of the 4th lens, f4Table
Show that the focal length of the 4th lens, f indicate the focal length of the optical imaging lens, EA34Indicate the third lens edge and institute
State the airspace distance between the 4th rims of the lens, EA45Indicate the 4th rims of the lens and the 5th rims of the lens it
Between airspace distance.
2. optical imaging lens according to claim 1, which is characterized in that the image side surface of first lens is in dipped beam axis
Place is concave surface, and the object side of the 4th lens has at least one knee of curve.
3. optical imaging lens according to claim 1, which is characterized in that also satisfy the following conditional expression：0.2<(R41+
R42)/(R41-R42)<0.8, wherein R41Indicate the radius of curvature of the 4th lens object side, R42Indicate the 4th lens
The radius of curvature of image side surface.
4. optical imaging lens according to claim 1, which is characterized in that also satisfy the following conditional expression：1.0<CT3/ET3<
1.5, wherein CT3Indicate thickness of the third lens on optical axis, ET3Indicate the edge thickness of the third lens.
5. optical imaging lens according to claim 4, which is characterized in that also satisfy the following conditional expression：1.0<(R31+
R32)/(R31-R32)<2.0, wherein R31Indicate the radius of curvature of the third lens object side, R32Indicate the third lens
The radius of curvature of image side surface.
6. optical imaging lens according to claim 1, which is characterized in that also satisfy the following conditional expression：0.2<(AG23+
AG34)/ALT<0.4, wherein AG23Indicate second lens and airspace of the third lens on optical axis, AG34Table
Show that the third lens and airspace of the 4th lens on optical axis, ALT indicate the first lens object side to institute
State distance of the 5th lens image side surface on optical axis.
7. optical imaging lens according to claim 1, which is characterized in that also satisfy the following conditional expression：2.0<f2/f5<
6.0, wherein f2Indicate the focal length of second lens, f5Indicate the focal length of the 5th lens.
8. optical imaging lens according to claim 1, which is characterized in that also satisfy the following conditional expression：18.0<|f2|/
CT2<30.0, wherein CT2Indicate thickness of second lens on optical axis.
9. optical imaging lens according to claim 1, which is characterized in that also satisfy the following conditional expression：0.8<LCT14/
LCT25<1.2, wherein LCT14Indicate distance of the first lens object side to the 4th lens image side surface on optical axis,
LCT25Indicate distance of the second lens object side to the 5th lens image side surface on optical axis.
10. according to the optical imaging lens described in claim 1 or 9, which is characterized in that also satisfy the following conditional expression：0.4<
f/(R51-R52)<0.8, wherein R51Indicate the radius of curvature of the 5th lens object side, R52Indicate the 5th lens image side
The radius of curvature in face.
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