CN207663139U

CN207663139U - Optical imaging system

Info

Publication number: CN207663139U
Application number: CN201820017804.6U
Authority: CN
Inventors: 王新权; 黄林
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2018-01-05
Filing date: 2018-01-05
Publication date: 2018-07-27
Anticipated expiration: 2028-01-05

Abstract

This application discloses a kind of optical imaging system, which includes sequentially by object side to image side along optical axis：First lens, the second lens, the third lens and the 4th lens.First lens, the third lens and the 4th lens all have positive light coke or negative power；It is concave surface that second lens, which have positive light coke, image side surface,；The image side surface of 4th lens is concave surface.Effective half bore DT11 of the object side of first lens, effective half bore DT21 of the object side of the second lens, effective half bore DT32 of image side surface of the third lens, effective half bore DT42 of image side surface of the 4th lens and the Entry pupil diameters EPD of optical imaging system meet (DT11+DT21+DT32+DT42)/EPD≤2.4.

Description

Optical imaging system

Technical field

This application involves a kind of optical imaging systems, more specifically, this application involves it is a kind of include four lens optics Imaging system.

Background technology

With the hair of the chip technologies such as photosensitive coupling element (CCD) or Complimentary Metal-Oxide semiconductor element (CMOS) Exhibition, the fields such as application extension to infrared imaging, distance measurement, infrared identification.Meanwhile it is continuous with portable electronic product Development, also proposed corresponding requirement to the miniaturization for the optical imaging system used that matches.

Existing miniaturized optical imaging system usually has larger F-number (F numbers), and light-inletting quantity is inclined in the unit interval It is small that imaging effect can be caused bad.Therefore, it is necessary to one kind have miniaturization, large aperture feature, and can be based on infrared band into The optical imaging system of row imaging, to ensure application of the optical imaging system in fields such as detection, identifications.

Utility model content

This application provides be applicable to portable electronic product, can at least solve or part solve it is in the prior art The optical imaging system of above-mentioned at least one disadvantage.

On the one hand, this application provides such a optical imaging systems, and the imaging system is along optical axis by object side to picture Side includes sequentially：First lens, the second lens, the third lens and the 4th lens.First lens, the third lens and the 4th lens are equal With positive light coke or negative power；Second lens can have positive light coke, and image side surface can be concave surface；The image side of 4th lens Face can be concave surface.Effective half bore DT11 of the object side of first lens, the object side of the second lens effective half bore DT21, Effective half bore DT32 of the image side surface of the third lens, effective half bore DT42 of the image side surface of the 4th lens and optical imagery system The Entry pupil diameters EPD of system can meet (DT11+DT21+DT32+DT42)/EPD≤2.4.

In one embodiment, optical imaging system may also include be set to the 4th lens and optical imaging system at Infrared band pass filter between image planes, band logical wave band can be 750nm to 1000nm.Further, the infrared band logical The band logical wave band of optical filter can be 850nm to 940nm.

In one embodiment, total effective focal length f of the optical imaging system and Entry pupil diameters EPD of optical imaging system F/EPD≤1.4 can be met.

In one embodiment, the 4th lens can have a positive light coke, the effective focal length f4 of the 4th lens and optics at As total effective focal length f of system can meet 1≤f4/f≤8.

In one embodiment, total effective focal length f of optical imaging system and the 4th lens are thick in the center on optical axis Degree CT4 can meet 6≤f/CT4≤10.

In one embodiment, the curvature of the image side surface of the radius of curvature R 3 and the second lens of the object side of the second lens Radius R4 can meet -7≤(R3+R4)/(R3-R4)≤- 4.

In one embodiment, the effective focal length f1 and second of total effective focal length f of optical imaging system, the first lens The effective focal length f2 of lens can meet 0.5≤| f/f1 |+| f/f2 |≤1.

In one embodiment, the radius of curvature R 4 of the image side surface of the effective focal length f2 and the second lens of the second lens can Meet 2≤f2/R4≤4.

In one embodiment, the first lens exist in the center thickness CT1 on optical axis with the second lens and the third lens Spacing distance T23 on optical axis can meet 1≤CT1/T23≤2.

In one embodiment, the curvature of the image side surface of the radius of curvature R 4 and the 4th lens of the image side surface of the second lens Radius R8 can meet 4≤(R4+R8)/(R4-R8)≤7.

On the other hand, this application provides such a optical imaging system, the imaging system along optical axis by object side extremely Image side includes sequentially：First lens, the second lens, the third lens and the 4th lens.First lens and the third lens all have just Focal power or negative power；Second lens can have positive light coke, and image side surface can be concave surface；4th lens can have positive light focus Degree, image side surface can be concave surface.The effective focal length f4 of 4th lens and total effective focal length f of optical imaging system can meet 1≤ f4/f≤8。

Another aspect, present invention also provides such a optical imaging systems, and the imaging system is along optical axis by object side Include sequentially to image side：First lens, the second lens, the third lens and the 4th lens.First lens, the third lens and the 4th are thoroughly Mirror all has positive light coke or negative power；Second lens can have positive light coke, and image side surface can be concave surface；4th lens Image side surface can be concave surface.Total effective focal length f of optical imaging system can meet with the 4th lens in the center thickness CT4 on optical axis 6≤f/CT4≤10。

Another aspect, present invention also provides such a optical imaging systems, and the imaging system is along optical axis by object side Include sequentially to image side：First lens, the second lens, the third lens and the 4th lens.First lens, the third lens and the 4th are thoroughly Mirror all has positive light coke or negative power；Second lens can have positive light coke, and image side surface can be concave surface；4th lens Image side surface can be concave surface.The radius of curvature R 3 of the object side of second lens can expire with the radius of curvature R 4 of the image side surface of the second lens Foot -7≤(R3+R4)/(R3-R4)≤- 4.

Another aspect, present invention also provides such a optical imaging systems, and the imaging system is along optical axis by object side Include sequentially to image side：First lens, the second lens, the third lens and the 4th lens.First lens, the third lens and the 4th are thoroughly Mirror all has positive light coke or negative power；Second lens can have positive light coke, and image side surface can be concave surface；4th lens Image side surface can be concave surface.Total effective focal length f of optical imaging system, the effective focal length f1 of the first lens are effective with the second lens Focal length f2 can meet 0.5≤| f/f1 |+| f/f2 |≤1.

Another aspect, present invention also provides such a optical imaging systems, and the imaging system is along optical axis by object side Include sequentially to image side：First lens, the second lens, the third lens and the 4th lens.First lens, the third lens and the 4th are thoroughly Mirror all has positive light coke or negative power；Second lens can have positive light coke, and image side surface can be concave surface；4th lens Image side surface can be concave surface.First lens are between the center thickness CT1 on optical axis and the second lens and the third lens are on optical axis Gauge can meet 1≤CT1/T23≤2 from T23.

Another aspect, present invention also provides such a optical imaging systems, and the imaging system is along optical axis by object side Include sequentially to image side：First lens, the second lens, the third lens and the 4th lens.First lens, the third lens and the 4th are thoroughly Mirror all has positive light coke or negative power；Second lens can have positive light coke, and image side surface can be concave surface；4th lens Image side surface can be concave surface.The radius of curvature R 4 and the radius of curvature R 8 of the image side surface of the 4th lens of the image side surface of second lens can expire Foot 4≤(R4+R8)/(R4-R8)≤7.

The application uses multi-disc (for example, four) lens, by each power of lens of reasonable distribution, face type, each Spacing etc. on axis between the center thickness of mirror and each lens so that above-mentioned optical imaging system have large aperture, miniaturization, High image quality can be based at least one advantageous effects such as infrared band imaging.

Description of the drawings

In conjunction with attached drawing, by the detailed description of following non-limiting embodiment, other features of the application, purpose and excellent Point will be apparent.In the accompanying drawings：

Fig. 1 shows the structural schematic diagram of the optical imaging system according to the embodiment of the present application 1；

Fig. 2A to Fig. 2 C respectively illustrates the astigmatism curve of the optical imaging system of embodiment 1, distortion curve and opposite Illumination curve；

Fig. 3 shows the structural schematic diagram of the optical imaging system according to the embodiment of the present application 2；

Fig. 4 A to Fig. 4 C respectively illustrate the astigmatism curve of the optical imaging system of embodiment 2, distortion curve and opposite Illumination curve；

Fig. 5 shows the structural schematic diagram of the optical imaging system according to the embodiment of the present application 3；

Fig. 6 A to Fig. 6 C respectively illustrate the astigmatism curve of the optical imaging system of embodiment 3, distortion curve and opposite Illumination curve；

Fig. 7 shows the structural schematic diagram of the optical imaging system according to the embodiment of the present application 4；

Fig. 8 A to Fig. 8 C respectively illustrate the astigmatism curve of the optical imaging system of embodiment 4, distortion curve and opposite Illumination curve；

Fig. 9 shows the structural schematic diagram of the optical imaging system according to the embodiment of the present application 5；

Figure 10 A to Figure 10 C respectively illustrate astigmatism curve, distortion curve and the phase of the optical imaging system of embodiment 5 To illumination curve；

Figure 11 shows the structural schematic diagram of the optical imaging system according to the embodiment of the present application 6；

Figure 12 A to figure 12 C respectively illustrates astigmatism curve, distortion curve and the phase of the optical imaging system of embodiment 6 To illumination curve；

Figure 13 shows the structural schematic diagram of the optical imaging system according to the embodiment of the present application 7；

Figure 14 A to Figure 14 C respectively illustrate astigmatism curve, distortion curve and the phase of the optical imaging system of embodiment 7 To illumination curve；

Figure 15 shows the structural schematic diagram of the optical imaging system according to the embodiment of the present application 8；

Figure 16 A to Figure 16 C respectively illustrate astigmatism curve, distortion curve and the phase of the optical imaging system of embodiment 8 To illumination curve；

Figure 17 shows the structural schematic diagrams according to the optical imaging system of the embodiment of the present application 9；

Figure 18 A to Figure 18 C respectively illustrate astigmatism curve, distortion curve and the phase of the optical imaging system of embodiment 9 To illumination curve.

Specific implementation mode

Refer to the attached drawing is made more detailed description by the application in order to better understand to the various aspects of the application.It answers Understand, the description of the only illustrative embodiments to the application is described in detail in these, rather than limits the application in any way Range.In the specification, the identical element of identical reference numbers.It includes associated institute to state "and/or" Any and all combinations of one or more of list of items.

It should be noted that in the present specification, first, second, third, etc. statement is only used for a feature and another spy Sign distinguishes, and does not indicate that any restrictions to feature.Therefore, without departing substantially from teachings of the present application, hereinafter The first lens discussed are also known as the second lens or the third lens.

In the accompanying drawings, for convenience of description, thickness, the size and shape of lens are slightly exaggerated.Specifically, attached drawing Shown in spherical surface or aspherical shape be illustrated by way of example.That is, spherical surface or aspherical shape are not limited to attached drawing Shown in spherical surface or aspherical shape.Attached drawing is merely illustrative and and non-critical drawn to scale.

Herein, near axis area refers to the region near optical axis.If lens surface is convex surface and does not define convex surface position When setting, then it represents that the lens surface is convex surface near axis area is less than；If lens surface is concave surface and does not define the concave surface position When, then it represents that the lens surface is concave surface near axis area is less than.It is known as object side near the surface of object in each lens, It is known as image side surface near the surface of imaging surface in each lens.

It will also be appreciated that term " comprising ", " including ", " having ", "comprising" and/or " including ", when in this theory It indicates there is stated feature, element and/or component when being used in bright book, but does not preclude the presence or addition of one or more Other feature, component, assembly unit and/or combination thereof.In addition, ought the statement of such as at least one of " ... " appear in institute When after the list of row feature, entire listed feature is modified, rather than modifies the individual component in list.In addition, when describing this When the embodiment of application, " one or more embodiments of the application " are indicated using "available".Also, term " illustrative " It is intended to refer to example or illustration.

Unless otherwise defined, otherwise all terms (including technical terms and scientific words) used herein all have with The application one skilled in the art's is generally understood identical meaning.It will also be appreciated that term (such as in everyday words Term defined in allusion quotation) it should be interpreted as having the meaning consistent with their meanings in the context of the relevant technologies, and It will not be explained with idealization or excessively formal sense, unless clear herein so limit.

It should be noted that in the absence of conflict, the features in the embodiments and the embodiments of the present application can phase Mutually combination.The application is described in detail below with reference to the accompanying drawings and in conjunction with the embodiments.

The feature of the application, principle and other aspects are described in detail below.

It may include such as four lens with focal power according to the optical imaging system of the application illustrative embodiments, That is, the first lens, the second lens, the third lens and the 4th lens.This four lens are sequentially arranged along optical axis by object side to image side Row.

In the exemplary embodiment, the first lens have positive light coke or negative power；Second lens can have positive light Focal power, image side surface can be concave surface；The third lens have positive light coke or negative power；4th lens have positive light coke or negative Focal power, image side surface can be concave surface.Arranged using such focal power and face type, help to shorten the overall length of imaging system, Light path, contract lenses bore are adjusted, to realize the miniaturization of module.

In the exemplary embodiment, the object side of the first lens can be convex surface, and image side surface can be concave surface.

In the exemplary embodiment, the object side of the second lens can be convex surface.

In the exemplary embodiment, the object side of the third lens can be convex surface.

In the exemplary embodiment, the 4th lens can have positive light coke, and object side can be convex surface.

In the exemplary embodiment, the optical imaging system of the application can meet conditional (DT11+DT21+DT32+ DT42)/EPD≤2.4, wherein DT11 is effective half bore of the object side of the first lens, and DT21 is the object side of the second lens Effective half bore, DT32 be the third lens image side surface effective half bore, DT42 be the 4th lens image side surface it is effective Half bore, EPD are the Entry pupil diameters of optical imaging system.More specifically, DT11, DT21, DT32, DT42 and EPD further may be used Meet 2.25≤(DT11+DT21+DT32+DT42)/EPD≤2.36.Meet conditional (DT11+DT21+DT32+DT42)/EPD ≤ 2.4, be conducive to increase the light-inletting quantity in the optical imaging system unit interval, improve image quality and (increase signal-to-noise ratio, improve and visit Survey accuracy of identification)；Meanwhile being conducive to the structure of compact optical imaging system, ensure miniaturization.

In the exemplary embodiment, the optical imaging system of the application may include setting the 4th lens and imaging surface it Between infrared band pass filter, the band logical wave band of the infrared band pass filter can be about 750nm to about 1000nm, further Ground, band logical wave band can be about 850nm to about 940nm.Infrared band pass filter is arranged between the 4th lens and imaging surface to be made Infrared light by and filter veiling glare, to eliminate the signal interference that non-infrared light is brought, for example, due to non-infrared light introduce color Difference and caused by image blur.

In the exemplary embodiment, the optical imaging system of the application can meet conditional f/EPD≤1.4, wherein f For total effective focal length of optical imaging system, EPD is the Entry pupil diameters of optical imaging system.More specifically, f and EPD are further 1.08≤f/EPD≤1.33 can be met.Meet conditional f/EPD≤1.4, image planes energy density can be effectively improved, improves Quantum efficiency QE (Quantum Efficiency) is relatively low and cause output signal-noise ratio (that is, red when chip receives infrared light Outer image quality or identification detection accuracy) relatively low problem.

In the exemplary embodiment, the optical imaging system of the application can meet conditional 1≤f4/f≤8, wherein f4 For the effective focal length of the 4th lens, f is total effective focal length of optical imaging system.More specifically, f4 and f can further meet 1.39≤f4/f≤7.23.Meet conditional 1≤f4/f≤8, be conducive to the overall length for shortening imaging system, realizes that module is small-sized Change；Be conducive to imaging system to be broadly equipped on all kinds of portable electronic products or be applied more broadly in small to module proposition Each field that size requires.

In the exemplary embodiment, the optical imaging system of the application can meet conditional 6≤f/CT4≤10, wherein F is total effective focal length of optical imaging system, and CT4 is the 4th lens in the center thickness on optical axis.More specifically, f and CT4 into One step can meet 6.21≤f/CT4≤9.37.Meet conditional 6≤f/CT4≤10, is conducive to the knot for adjusting optical imaging system Structure is laid out, and is being reduced module entire length and is being ensured to obtain preferable balance between the 4th lens processing technology.

In the exemplary embodiment, the optical imaging system of the application can meet conditional -7≤(R3+R4)/(R3- R4)≤- 4, wherein R3 is the radius of curvature of the object side of the second lens, and R4 is the radius of curvature of the image side surface of the second lens.More Specifically, R3 and R4 can further meet -6.04≤(R3+R4)/(R3-R4)≤- 4.31.Meet conditional -7≤(R3+R4)/ (R3-R4)≤- 4 the incident angle of each visual field incidence the third lens, can effectively be adjusted；Meanwhile the ball of imaging system can be improved Difference.

In the exemplary embodiment, the optical imaging system of the application can meet conditional 0.5≤| f/f1 |+| f/f2 | ≤ 1, wherein f is total effective focal length of optical imaging system, and f1 is the effective focal length of the first lens, and f2 is having for the second lens Imitate focal length.More specifically, f, f1 and f2 can further meet 0.55≤| f/f1 |+| f/f2 |≤0.80, for example, 0.60≤| f/ f1|+|f/f2|≤0.77.Meet conditional 0.5≤| f/f1 |+| f/f2 |≤1, the excessive collection of focal power can be effectively prevented from In, the tolerance sensitivity of imaging system is reduced, production yield is improved.

In the exemplary embodiment, the optical imaging system of the application can meet conditional 2≤f2/R4≤4, wherein F2 is the effective focal length of the second lens, and R4 is the radius of curvature of the image side surface of the second lens.More specifically, f2 and R4 further may be used Meet 2.45≤f2/R4≤3.61.Meet conditional 2≤f2/R4≤4, is conducive to the processing technology for improving the second lens, drop Low manufacture difficulty.

In the exemplary embodiment, the optical imaging system of the application can meet conditional 1≤CT1/T23≤2, In, CT1 is the first lens in the center thickness on optical axis, and T23 is the spacing distance of the second lens and the third lens on optical axis. More specifically, CT1 and T23 can further meet 1.26≤CT1/T23≤1.86.Meet conditional 1≤CT1/T23≤2, favorably In space on the axis of reasonable distribution optical imaging system, to shorten system overall length；Be conducive to lens assembling, to promote imaging system Production yield.

In the exemplary embodiment, the optical imaging system of the application can meet conditional 4≤(R4+R8)/(R4-R8) ≤ 7, wherein R4 is the radius of curvature of the image side surface of the second lens, and R8 is the radius of curvature of the image side surface of the 4th lens.More specifically Ground, R4 and R8 can further meet 4.05≤(R4+R8)/(R4-R8)≤6.40.Meet conditional 4≤(R4+R8)/(R4-R8) ≤ 7, can effectively outer field rays of adjustment axis incident angle, the aberration of the outer field of view of correction axis.

Optionally, above-mentioned optical imaging system may also include at least one diaphragm, to promote the image quality of imaging system. Diaphragm may be provided between the first lens and the second lens.

Optionally, above-mentioned optical imaging system may also include the protection glass for protecting the photosensitive element being located on imaging surface Glass.

Multi-disc eyeglass, such as described above four can be used according to the optical imaging system of the above embodiment of the application Piece.By each power of lens of reasonable distribution, face type, each lens center thickness and each lens between axis on spacing Deng can effectively reduce the volume of imaging system, reduce the susceptibility of imaging system and improve the machinability of imaging system, make Optical imaging system is obtained to be more advantageous to production and processing and be applicable to portable electronic product.Meanwhile passing through above-mentioned configuration Optical imaging system also has such as large aperture, high image quality, hyposensitivity, can be based on infrared band is imaged beneficial to effect Fruit.

In presently filed embodiment, at least one of minute surface of each lens is aspherical mirror.Non-spherical lens The characteristics of be：From lens centre to lens perimeter, curvature is consecutive variations.It is constant with having from lens centre to lens perimeter The spherical lens of curvature is different, and non-spherical lens has more preferably radius of curvature characteristic, and there is improvement to distort aberration and improve picture The advantages of dissipating aberration.After non-spherical lens, the aberration occurred when imaging can be eliminated as much as possible, so as to improve Image quality.

However, it will be understood by those of skill in the art that without departing from this application claims technical solution the case where Under, the lens numbers for constituting optical imaging system can be changed, to obtain each result and advantage described in this specification.Example Such as, although being described by taking four lens as an example in embodiments, which is not limited to include four Lens.If desired, the optical imaging system may also include the lens of other quantity.

The specific embodiment for the optical imaging system for being applicable to the above embodiment is further described with reference to the accompanying drawings.

Embodiment 1

Referring to Fig. 1 to Fig. 2 C descriptions according to the optical imaging system of the embodiment of the present application 1.Fig. 1 is shown according to this Apply for the structural schematic diagram of the optical imaging system of embodiment 1.

As shown in Figure 1, according to the optical imaging system of the application illustrative embodiments along optical axis by object side to image side according to Sequence includes：First lens E1, diaphragm STO, the second lens E2, the third lens E3, the 4th lens E4, optical filter E5 and imaging surface S11。

It is convex surface that first lens E1, which has positive light coke, object side S1, and image side surface S2 is concave surface；Second lens E2 has Positive light coke, object side S3 are convex surface, and image side surface S4 is concave surface；The third lens E3 has negative power, and object side S5 is Convex surface, image side surface S6 are concave surface；It is convex surface that 4th lens E4, which has positive light coke, object side S7, and image side surface S8 is concave surface.Filter Mating plate E5 has object side S9 and image side surface S10, can be infrared band pass filter, and band logical wave band can be about 750nm to about 1000nm, further, band logical wave band can be about 850nm to about 940nm.Light from object sequentially passes through each surface S1 To S10 and it is ultimately imaged on imaging surface S11.

Table 1 show the surface types of each lens of the optical imaging system of embodiment 1, radius of curvature, thickness, material and Circular cone coefficient, wherein radius of curvature and the unit of thickness are millimeter (mm).

Table 1

As shown in Table 1, the object side of any one lens in the first lens E1 to the 4th lens E4 and image side surface are It is aspherical.In the present embodiment, the face type x of each non-spherical lens is available but is not limited to following aspherical formula and is defined：

Wherein, x be it is aspherical along optical axis direction when being highly the position of h, away from aspheric vertex of surface apart from rise；C is Aspherical paraxial curvature, c=1/R (that is, paraxial curvature c is the inverse of 1 mean curvature radius R of upper table)；K be circular cone coefficient ( It has been provided in table 1)；Ai is the correction factor of aspherical i-th-th ranks.The following table 2 give can be used for it is each aspherical in embodiment 1 The high-order coefficient A of minute surface S1-S8₄、A₆、A₈、A₁₀、A₁₂、A₁₄And A₁₆。

Table 2

Table 3 provides the effective focal length f1 to f4 of each lens in embodiment 1, total effective focal length f of optical imaging system, first Effective pixel area on the center of the object side S1 of lens E1 to imaging surface S11 distance TTL on optical axis and imaging surface S11 The half ImgH of diagonal line length.

f1(mm)	10.98	f(mm)	2.10
				f2(mm)	4.52	TTL(mm)	3.00
f3(mm)	-1156.17	ImgH(mm)	1.56
				f4(mm)	3.46

Table 3

Optical imaging system in embodiment 1 meets：

(DT11+DT21+DT32+DT42)/EPD=2.32, wherein DT11 is the effective of the object side S1 of the first lens E1 Half bore, DT21 are effective half bore of the object side S3 of the second lens E2, and DT32 is having for the image side surface S6 of the third lens E3 Half bore is imitated, DT42 is effective half bore of the image side surface S8 of the 4th lens E4, and EPD is the Entry pupil diameters of optical imaging system；

F/EPD=1.12, wherein f is total effective focal length of optical imaging system, and EPD is the entrance pupil of optical imaging system Diameter；

F4/f=1.64, wherein f4 is the effective focal length of the 4th lens E4, and f is total effective focal length of optical imaging system；

F/CT4=7.51, wherein f is total effective focal length of optical imaging system, and CT4 is the 4th lens E4 on optical axis Center thickness；

(R3+R4)/(R3-R4)=- 6.04, wherein R3 is the radius of curvature of the object side S3 of the second lens E2, R4 the The radius of curvature of the image side surface S4 of two lens E2；

| f/f1 |+| f/f2 |=0.66, wherein f is total effective focal length of optical imaging system, and f1 is the first lens E1's Effective focal length, f2 are the effective focal length of the second lens E2；

F2/R4=3.61, wherein f2 is the effective focal length of the second lens E2, and R4 is the image side surface S4's of the second lens E2 Radius of curvature；

CT1/T23=1.78, wherein CT1 is the first lens E1 in the center thickness on optical axis, and T23 is the second lens E2 With spacing distances of the third lens E3 on optical axis；

(R4+R8)/(R4-R8)=4.74, wherein R4 is the radius of curvature of the image side surface S4 of the second lens E2, R8 the The radius of curvature of the image side surface S8 of four lens E4.

Fig. 2A shows the astigmatism curve of the optical imaging system of embodiment 1, indicates meridianal image surface bending and sagitta of arc picture Face is bent.Fig. 2 B show the distortion curve of the optical imaging system of embodiment 1, indicate that the distortion in the case of different visual angles is big Small value.Fig. 2 C show the relative illumination curve of the optical imaging system of embodiment 1, indicate that different image height institutes are right on imaging surface The relative illumination answered.A to Fig. 2 C is it is found that the optical imaging system given by embodiment 1 can realize good imaging according to fig. 2 Quality.

Embodiment 2

Referring to Fig. 3 to Fig. 4 C descriptions according to the optical imaging system of the embodiment of the present application 2.In the present embodiment and following In embodiment, for brevity, by clipped description similar to Example 1.Fig. 3 is shown according to the embodiment of the present application 2 Optical imaging system structural schematic diagram.

As shown in figure 3, according to the optical imaging system of the application illustrative embodiments along optical axis by object side to image side according to Sequence includes：First lens E1, diaphragm STO, the second lens E2, the third lens E3, the 4th lens E4, optical filter E5 and imaging surface S11。

It is convex surface that first lens E1, which has negative power, object side S1, and image side surface S2 is concave surface；Second lens E2 has Positive light coke, object side S3 are convex surface, and image side surface S4 is concave surface；The third lens E3 has positive light coke, and object side S5 is Convex surface, image side surface S6 are concave surface；It is convex surface that 4th lens E4, which has positive light coke, object side S7, and image side surface S8 is concave surface.Filter Mating plate E5 has object side S9 and image side surface S10, can be infrared band pass filter, and band logical wave band can be about 750nm to about 1000nm, further, band logical wave band can be about 850nm to about 940nm.Light from object sequentially passes through each surface S1 To S10 and it is ultimately imaged on imaging surface S11.

Table 4 show the surface types of each lens of the optical imaging lens of embodiment 2, radius of curvature, thickness, material and Circular cone coefficient, wherein radius of curvature and the unit of thickness are millimeter (mm).

Table 4

As shown in Table 4, in example 2, the object side of any one lens in the first lens E1 to the 4th lens E4 It is aspherical with image side surface.Table 5 shows the high-order coefficient that can be used for each aspherical mirror in embodiment 2, wherein each non- Spherical surface type can be limited by the formula (1) provided in above-described embodiment 1.

Face number

A4

A6

A8

A10

A12

A14

A16

S1

-1.2651E-01

8.0033E-02

2.2395E-02

-1.1529E-01

-2.4184E-01

3.9179E-01

-1.3549E-01

S2

-3.6715E-01

1.7736E-01

1.7900E-02

-1.8917E-01

2.2260E-01

-6.8851E-02

-6.2409E-03

S3

-7.4745E-01

1.5381E+00

-7.3340E+00

1.7298E+01

-1.9240E+01

1.0284E+01

-2.0539E+00

S4

2.4835E-01

-2.1812E+00

3.0295E+00

-3.3680E+00

5.3130E+00

-5.7962E+00

2.0575E+00

S5

2.2216E-02

2.3694E+00

-1.7549E+01

6.1228E+01

-1.1661E+02

1.1502E+02

-4.6229E+01

S6

-2.5445E+00

1.1451E+01

-2.9836E+01

4.7436E+01

-4.4823E+01

2.3271E+01

-5.1235E+00

S7

-1.9585E+00

5.7441E+00

-1.1958E+01

1.5376E+01

-1.1801E+01

5.1024E+00

-9.6116E-01

S8

-1.3026E+00

2.3608E+00

-3.1221E+00

2.5243E+00

-1.1080E+00

1.9890E-01

0.0000E+00

Table 5

Table 6 provides the effective focal length f1 to f4 of each lens in embodiment 2, total effective focal length f of optical imaging system, first Effective pixel area on the center of the object side S1 of lens E1 to imaging surface S11 distance TTL on optical axis and imaging surface S11 The half ImgH of diagonal line length.

f1(mm)	-163.55	f(mm)	2.10
				f2(mm)	2.89	TTL(mm)	3.00
f3(mm)	23.61	ImgH(mm)	1.57
				f4(mm)	4.44

Table 6

Fig. 4 A show the astigmatism curve of the optical imaging system of embodiment 2, indicate meridianal image surface bending and sagitta of arc picture Face is bent.Fig. 4 B show the distortion curve of the optical imaging system of embodiment 2, indicate that the distortion in the case of different visual angles is big Small value.Fig. 4 C show the relative illumination curve of the optical imaging system of embodiment 2, indicate that different image height institutes are right on imaging surface The relative illumination answered.According to Fig. 4 A to Fig. 4 C it is found that the optical imaging system given by embodiment 2 can realize good imaging Quality.

Embodiment 3

The optical imaging system according to the embodiment of the present application 3 is described referring to Fig. 5 to Fig. 6 C.Fig. 5 shows basis The structural schematic diagram of the optical imaging system of the embodiment of the present application 3.

As shown in figure 5, according to the optical imaging system of the application illustrative embodiments along optical axis by object side to image side according to Sequence includes：First lens E1, diaphragm STO, the second lens E2, the third lens E3, the 4th lens E4, optical filter E5 and imaging surface S11。

It is convex surface that first lens E1, which has positive light coke, object side S1, and image side surface S2 is concave surface；Second lens E2 has Positive light coke, object side S3 are convex surface, and image side surface S4 is concave surface；The third lens E3 has positive light coke, and object side S5 is Convex surface, image side surface S6 are concave surface；It is convex surface that 4th lens E4, which has positive light coke, object side S7, and image side surface S8 is concave surface.Filter Mating plate E5 has object side S9 and image side surface S10, can be infrared band pass filter, and band logical wave band can be about 750nm to about 1000nm, further, band logical wave band can be about 850nm to about 940nm.Light from object sequentially passes through each surface S1 To S10 and it is ultimately imaged on imaging surface S11.

Table 7 show the surface types of each lens of the optical imaging lens of embodiment 3, radius of curvature, thickness, material and Circular cone coefficient, wherein radius of curvature and the unit of thickness are millimeter (mm).

Table 7

As shown in Table 7, in embodiment 3, the object side of any one lens in the first lens E1 to the 4th lens E4 It is aspherical with image side surface.Table 8 shows the high-order coefficient that can be used for each aspherical mirror in embodiment 3, wherein each non- Spherical surface type can be limited by the formula (1) provided in above-described embodiment 1.

Face number

A4

A6

A8

A10

A12

A14

A16

S1

-8.7530E-02

-4.0681E-02

9.8113E-02

-6.0798E-02

-2.6039E-01

3.3429E-01

-1.0963E-01

S2

-3.1146E-01

1.3145E-01

1.2977E-02

-1.3606E-01

1.6401E-01

-5.2946E-02

-7.3639E-03

S3

-4.3477E-01

1.7804E-01

-1.1794E+00

2.2011E+00

-3.8003E-01

-1.4225E+00

7.8441E-01

S4

-4.6458E-02

5.7724E-01

-7.5722E+00

2.2683E+01

-3.4682E+01

2.8206E+01

-9.8064E+00

S5

1.2009E-01

-1.8264E-01

-1.2267E+00

6.4015E+00

-1.5411E+01

1.7624E+01

-7.5308E+00

S6

-1.7492E+00

7.6498E+00

-2.3437E+01

4.6343E+01

-5.6142E+01

3.7563E+01

-1.0412E+01

S7

6.0053E-01

-4.4092E+00

1.0136E+01

-1.3689E+01

1.0800E+01

-4.4580E+00

7.3851E-01

S8

-5.5001E-01

-2.5783E-02

4.6434E-01

-4.5129E-01

1.8053E-01

-2.6277E-02

0.0000E+00

Table 8

Table 9 provides the effective focal length f1 to f4 of each lens in embodiment 3, total effective focal length f of optical imaging system, first Effective pixel area on the center of the object side S1 of lens E1 to imaging surface S11 distance TTL on optical axis and imaging surface S11 The half ImgH of diagonal line length.

f1(mm)	127.57	f(mm)	2.07
				f2(mm)	3.52	TTL(mm)	3.14
f3(mm)	40.59	ImgH(mm)	1.58
				f4(mm)	2.99

Table 9

Fig. 6 A show the astigmatism curve of the optical imaging system of embodiment 3, indicate meridianal image surface bending and sagitta of arc picture Face is bent.Fig. 6 B show the distortion curve of the optical imaging system of embodiment 3, indicate that the distortion in the case of different visual angles is big Small value.Fig. 6 C show the relative illumination curve of the optical imaging system of embodiment 3, indicate that different image height institutes are right on imaging surface The relative illumination answered.According to Fig. 6 A to Fig. 6 C it is found that the optical imaging system given by embodiment 3 can realize good imaging Quality.

Embodiment 4

The optical imaging system according to the embodiment of the present application 4 is described referring to Fig. 7 to Fig. 8 C.Fig. 7 shows basis The structural schematic diagram of the optical imaging system of the embodiment of the present application 4.

As shown in fig. 7, according to the optical imaging system of the application illustrative embodiments along optical axis by object side to image side according to Sequence includes：First lens E1, diaphragm STO, the second lens E2, the third lens E3, the 4th lens E4, optical filter E5 and imaging surface S11。

It is convex surface that first lens E1, which has positive light coke, object side S1, and image side surface S2 is concave surface；Second lens E2 has Positive light coke, object side S3 are convex surface, and image side surface S4 is concave surface；The third lens E3 has positive light coke, and object side S5 is Convex surface, image side surface S6 are convex surface；It is convex surface that 4th lens E4, which has positive light coke, object side S7, and image side surface S8 is concave surface.Filter Mating plate E5 has object side S9 and image side surface S10, can be infrared band pass filter, and band logical wave band can be about 750nm to about 1000nm, further, band logical wave band can be about 850nm to about 940nm.Light from object sequentially passes through each surface S1 To S10 and it is ultimately imaged on imaging surface S11.

Table 10 shows surface type, radius of curvature, thickness, the material of each lens of the optical imaging lens of embodiment 4 And circular cone coefficient, wherein radius of curvature and the unit of thickness are millimeter (mm).

Table 10

As shown in Table 10, in example 4, the object side of any one lens in the first lens E1 to the 4th lens E4 It is aspherical with image side surface.Table 11 shows the high-order coefficient that can be used for each aspherical mirror in embodiment 4, wherein each Aspherical face type can be limited by the formula (1) provided in above-described embodiment 1.

Face number

A4

A6

A8

A10

A12

A14

A16

S1

-8.1951E-02

-4.4190E-02

1.0140E-01

-5.8839E-02

-2.6256E-01

3.3042E-01

-1.0898E-01

S2

-3.0563E-01

1.2717E-01

7.4926E-03

-1.3778E-01

1.6502E-01

-5.2830E-02

-8.1007E-03

S3

-4.5395E-01

2.9674E-01

-1.4305E+00

2.5115E+00

-6.6503E-01

-1.2039E+00

7.1037E-01

S4

-2.8266E-03

-3.9252E-01

-2.1567E+00

7.4543E+00

-1.0726E+01

8.4784E+00

-3.1366E+00

S5

-1.8912E-01

1.5317E+00

-9.0480E+00

2.8470E+01

-5.3049E+01

5.3251E+01

-2.1807E+01

S6

-8.2437E-01

2.9277E+00

-8.0628E+00

1.5015E+01

-1.8242E+01

1.3209E+01

-4.0978E+00

S7

-4.1028E-01

-3.7776E-01

8.6033E-01

-7.1606E-01

2.8322E-01

2.2602E-02

-3.4061E-02

S8

-8.2501E-01

7.2226E-01

-5.7931E-01

3.7072E-01

-1.5888E-01

3.0234E-02

0.0000E+00

Table 11

Table 12 provides the effective focal length f1 to f4 of each lens in embodiment 4, total effective focal length f of optical imaging system, Effective pixel region on the center of the object side S1 of one lens E1 to imaging surface S11 distance TTL on optical axis and imaging surface S11 The half ImgH of domain diagonal line length.

f1(mm)	37.01	f(mm)	2.54
				f2(mm)	3.61	TTL(mm)	3.30
f3(mm)	9.56	ImgH(mm)	1.58
				f4(mm)	18.37

Table 12

Fig. 8 A show the astigmatism curve of the optical imaging system of embodiment 4, indicate meridianal image surface bending and sagitta of arc picture Face is bent.Fig. 8 B show the distortion curve of the optical imaging system of embodiment 4, indicate that the distortion in the case of different visual angles is big Small value.Fig. 8 C show the relative illumination curve of the optical imaging system of embodiment 4, indicate that different image height institutes are right on imaging surface The relative illumination answered.According to Fig. 8 A to Fig. 8 C it is found that the optical imaging system given by embodiment 4 can realize good imaging Quality.

Embodiment 5

The optical imaging system according to the embodiment of the present application 5 is described referring to Fig. 9 to Figure 10 C.Fig. 9 shows basis The structural schematic diagram of the optical imaging system of the embodiment of the present application 5.

As shown in figure 9, according to the optical imaging system of the application illustrative embodiments along optical axis by object side to image side according to Sequence includes：First lens E1, diaphragm STO, the second lens E2, the third lens E3, the 4th lens E4, optical filter E5 and imaging surface S11。

Table 13 shows surface type, radius of curvature, thickness, the material of each lens of the optical imaging lens of embodiment 5 And circular cone coefficient, wherein radius of curvature and the unit of thickness are millimeter (mm).

Table 13

As shown in Table 13, in embodiment 5, the object side of any one lens in the first lens E1 to the 4th lens E4 It is aspherical with image side surface.Table 14 shows the high-order coefficient that can be used for each aspherical mirror in embodiment 5, wherein each Aspherical face type can be limited by the formula (1) provided in above-described embodiment 1.

Face number

A4

A6

A8

A10

A12

A14

A16

S1

-1.1668E-01

4.5228E-02

5.5758E-02

-7.6550E-02

-2.4028E-01

3.7025E-01

-1.3345E-01

S2

-2.8025E-01

1.7904E-01

-2.2183E-02

-1.8951E-01

2.6351E-01

-7.5937E-02

-7.1529E-03

S3

-4.9314E-01

6.8086E-01

-2.4991E+00

4.1926E+00

-2.4766E+00

-3.4909E-02

3.8125E-01

S4

1.0537E-01

-1.2783E+00

2.1608E+00

-3.6801E+00

3.9820E+00

-1.4917E+00

-2.7452E-01

S5

3.1898E-03

6.1501E-01

-4.1961E+00

1.3016E+01

-2.3924E+01

2.3076E+01

-8.7561E+00

S6

-2.2236E+00

8.9436E+00

-2.5021E+01

4.6071E+01

-5.2725E+01

3.3637E+01

-8.9497E+00

S7

-5.4604E-01

5.9225E-01

-1.6306E+00

3.2250E+00

-3.5114E+00

1.9690E+00

-4.3644E-01

S8

-5.1164E-01

-3.6135E-03

3.9806E-01

-3.8530E-01

1.4877E-01

-2.0983E-02

0.0000E+00

Table 14

Table 15 provides the effective focal length f1 to f4 of each lens in embodiment 5, total effective focal length f of optical imaging system, Effective pixel region on the center of the object side S1 of one lens E1 to imaging surface S11 distance TTL on optical axis and imaging surface S11 The half ImgH of domain diagonal line length.

f1(mm)	53.79	f(mm)	2.08
				f2(mm)	3.72	TTL(mm)	3.15
f3(mm)	-144.17	ImgH(mm)	1.58
				f4(mm)	2.90

Table 15

Figure 10 A show the astigmatism curve of the optical imaging system of embodiment 5, indicate meridianal image surface bending and sagitta of arc picture Face is bent.Figure 10 B show the distortion curve of the optical imaging system of embodiment 5, indicate the distortion in the case of different visual angles Sizes values.Figure 10 C show the relative illumination curve of the optical imaging system of embodiment 5, indicate different image heights on imaging surface Corresponding relative illumination.According to Figure 10 A to Figure 10 C it is found that the optical imaging system given by embodiment 5 can be realized well Image quality.

Embodiment 6

The optical imaging system according to the embodiment of the present application 6 is described referring to Figure 11 to Figure 12 C.Figure 11 shows root According to the structural schematic diagram of the optical imaging system of the embodiment of the present application 6.

As shown in figure 11, according to the optical imaging system of the application illustrative embodiments along optical axis by object side to image side according to Sequence includes：First lens E1, diaphragm STO, the second lens E2, the third lens E3, the 4th lens E4, optical filter E5 and imaging surface S11。

Table 16 shows surface type, radius of curvature, thickness, the material of each lens of the optical imaging lens of embodiment 6 And circular cone coefficient, wherein radius of curvature and the unit of thickness are millimeter (mm).

Table 16

As shown in Table 16, in embodiment 6, the object side of any one lens in the first lens E1 to the 4th lens E4 It is aspherical with image side surface.Table 17 shows the high-order coefficient that can be used for each aspherical mirror in embodiment 6, wherein each Aspherical face type can be limited by the formula (1) provided in above-described embodiment 1.

Face number

A4

A6

A8

A10

A12

A14

A16

S1

-1.0108E-01

3.9183E-02

2.2631E-02

-9.8675E-02

-2.3754E-01

3.8566E-01

-1.3720E-01

S2

-3.3909E-01

1.7977E-01

7.0949E-03

-1.8905E-01

2.2919E-01

-7.4188E-02

-7.4130E-03

S3

-6.3452E-01

-1.9244E-01

1.1804E+00

-1.6204E+00

3.1013E+00

-3.5357E+00

1.5060E+00

S4

-3.0552E-01

1.6646E+00

-1.4499E+01

4.9681E+01

-8.8397E+01

8.1567E+01

-3.1466E+01

S5

3.8617E-01

-2.0272E+00

3.3505E+00

4.8201E+00

-2.9750E+01

4.5176E+01

-2.3649E+01

S6

-2.4666E+00

1.1444E+01

-3.1749E+01

5.3587E+01

-5.3588E+01

2.9557E+01

-6.9476E+00

S7

-8.0708E-01

6.4179E-01

4.1531E-01

-1.4099E+00

1.2371E+00

-4.2854E-01

4.2530E-02

S8

-1.2338E+00

1.8596E+00

-1.9409E+00

1.2861E+00

-4.9592E-01

8.2282E-02

0.0000E+00

Table 17

Table 18 provides the effective focal length f1 to f4 of each lens in embodiment 6, total effective focal length f of optical imaging system, Effective pixel region on the center of the object side S1 of one lens E1 to imaging surface S11 distance TTL on optical axis and imaging surface S11 The half ImgH of domain diagonal line length.

f1(mm)	23.72	f(mm)	2.10
				f2(mm)	3.81	TTL(mm)	3.09
f3(mm)	19.35	ImgH(mm)	1.58
				f4(mm)	3.72

Table 18

Figure 12 A show the astigmatism curve of the optical imaging system of embodiment 6, indicate meridianal image surface bending and sagitta of arc picture Face is bent.Figure 12 B show the distortion curve of the optical imaging system of embodiment 6, indicate the distortion in the case of different visual angles Sizes values.Figure 12 C show the relative illumination curve of the optical imaging system of embodiment 6, indicate different image heights on imaging surface Corresponding relative illumination.According to figure 12 A to figure 12 C it is found that the optical imaging system given by embodiment 6 can be realized well Image quality.

Embodiment 7

The optical imaging system according to the embodiment of the present application 7 is described referring to Figure 13 to Figure 14 C.Figure 13 shows root According to the structural schematic diagram of the optical imaging system of the embodiment of the present application 7.

As shown in figure 13, according to the optical imaging system of the application illustrative embodiments along optical axis by object side to image side according to Sequence includes：First lens E1, diaphragm STO, the second lens E2, the third lens E3, the 4th lens E4, optical filter E5 and imaging surface S11。

Table 19 shows surface type, radius of curvature, thickness, the material of each lens of the optical imaging system of embodiment 7 And circular cone coefficient, wherein radius of curvature and the unit of thickness are millimeter (mm).

Table 19

As shown in Table 19, in embodiment 7, the object side of any one lens in the first lens E1 to the 4th lens E4 It is aspherical with image side surface.Table 20 shows the high-order coefficient that can be used for each aspherical mirror in embodiment 7, wherein each Aspherical face type can be limited by the formula (1) provided in above-described embodiment 1.

Face number

A4

A6

A8

A10

A12

A14

A16

S1

-1.1235E-01

5.5845E-02

3.7263E-02

-9.0487E-02

-2.3558E-01

3.8567E-01

-1.3879E-01

S2

-3.1557E-01

1.8694E-01

3.0387E-04

-1.9533E-01

2.3834E-01

-4.8168E-02

-7.7421E-03

S3

-5.4566E-01

5.5261E-01

-2.9557E+00

7.0115E+00

-6.8076E+00

2.7971E+00

-2.7059E-01

S4

4.1973E-02

-8.5771E-01

-1.3033E+00

7.2671E+00

-1.2756E+01

1.1442E+01

-4.6433E+00

S5

1.7453E-01

2.6029E-01

-5.0693E+00

2.0420E+01

-4.1641E+01

4.3029E+01

-1.7861E+01

S6

-2.1534E+00

8.2621E+00

-1.8371E+01

2.4227E+01

-1.8104E+01

7.1823E+00

-1.2081E+00

S7

-1.4112E+00

3.3058E+00

-5.7870E+00

6.7342E+00

-4.8984E+00

2.0358E+00

-3.6474E-01

S8

-1.1057E+00

1.5599E+00

-1.6714E+00

1.1745E+00

-4.7981E-01

8.2988E-02

0.0000E+00

Table 20

Table 21 provides the effective focal length f1 to f4 of each lens in embodiment 7, total effective focal length f of optical imaging system, Effective pixel region on the center of the object side S1 of one lens E1 to imaging surface S11 distance TTL on optical axis and imaging surface S11 The half ImgH of domain diagonal line length.

f1(mm)	23.85	f(mm)	2.10
				f2(mm)	3.75	TTL(mm)	3.09
f3(mm)	23.79	ImgH(mm)	1.58
				f4(mm)	4.00

Table 21

Figure 14 A show the astigmatism curve of the optical imaging system of embodiment 7, indicate meridianal image surface bending and sagitta of arc picture Face is bent.Figure 14 B show the distortion curve of the optical imaging system of embodiment 7, indicate the distortion in the case of different visual angles Sizes values.Figure 14 C show the relative illumination curve of the optical imaging system of embodiment 7, indicate different image heights on imaging surface Corresponding relative illumination.According to Figure 14 A to Figure 14 C it is found that the optical imaging system given by embodiment 7 can be realized well Image quality.

Embodiment 8

The optical imaging system according to the embodiment of the present application 8 is described referring to Figure 15 to Figure 16 C.Figure 15 shows root According to the structural schematic diagram of the optical imaging system of the embodiment of the present application 8.

As shown in figure 15, according to the optical imaging system of the application illustrative embodiments along optical axis by object side to image side according to Sequence includes：First lens E1, diaphragm STO, the second lens E2, the third lens E3, the 4th lens E4, optical filter E5 and imaging surface S11。

Table 22 shows surface type, radius of curvature, thickness, the material of each lens of the optical imaging system of embodiment 8 And circular cone coefficient, wherein radius of curvature and the unit of thickness are millimeter (mm).

Table 22

As shown in Table 22, in embodiment 8, the object side of any one lens in the first lens E1 to the 4th lens E4 It is aspherical with image side surface.Table 23 shows the high-order coefficient that can be used for each aspherical mirror in embodiment 8, wherein each Aspherical face type can be limited by the formula (1) provided in above-described embodiment 1.

Table 23

Table 24 provides the effective focal length f1 to f4 of each lens in embodiment 8, total effective focal length f of optical imaging system, Effective pixel region on the center of the object side S1 of one lens E1 to imaging surface S11 distance TTL on optical axis and imaging surface S11 The half ImgH of domain diagonal line length.

f1(mm)	21.22	f(mm)	2.11
				f2(mm)	3.83	TTL(mm)	3.11
f3(mm)	18.62	ImgH(mm)	1.58
				f4(mm)	4.25

Table 24

Figure 16 A show the astigmatism curve of the optical imaging system of embodiment 8, indicate meridianal image surface bending and sagitta of arc picture Face is bent.Figure 16 B show the distortion curve of the optical imaging system of embodiment 8, indicate the distortion in the case of different visual angles Sizes values.Figure 16 C show the relative illumination curve of the optical imaging system of embodiment 8, indicate different image heights on imaging surface Corresponding relative illumination.According to Figure 16 A to Figure 16 C it is found that the optical imaging system given by embodiment 8 can be realized well Image quality.

Embodiment 9

The optical imaging system according to the embodiment of the present application 9 is described referring to Figure 17 to Figure 18 C.Figure 17 shows roots According to the structural schematic diagram of the optical imaging system of the embodiment of the present application 9.

As shown in figure 17, according to the optical imaging system of the application illustrative embodiments along optical axis by object side to image side according to Sequence includes：First lens E1, diaphragm STO, the second lens E2, the third lens E3, the 4th lens E4, optical filter E5 and imaging surface S11。

Table 25 shows surface type, radius of curvature, thickness, the material of each lens of the optical imaging system of embodiment 9 And circular cone coefficient, wherein radius of curvature and the unit of thickness are millimeter (mm).

Table 25

As shown in Table 25, in embodiment 9, the object side of any one lens in the first lens E1 to the 4th lens E4 It is aspherical with image side surface.Table 26 shows the high-order coefficient that can be used for each aspherical mirror in embodiment 9, wherein each Aspherical face type can be limited by the formula (1) provided in above-described embodiment 1.

Table 26

Table 27 provides the effective focal length f1 to f4 of each lens in embodiment 9, total effective focal length f of optical imaging system, Effective pixel region on the center of the object side S1 of one lens E1 to imaging surface S11 distance TTL on optical axis and imaging surface S11 The half ImgH of domain diagonal line length.

f1(mm)	20.48	f(mm)	2.01
				f2(mm)	3.89	TTL(mm)	3.00
f3(mm)	17.93	ImgH(mm)	1.58
				f4(mm)	3.75

Table 27

Figure 18 A show the astigmatism curve of the optical imaging system of embodiment 9, indicate meridianal image surface bending and sagitta of arc picture Face is bent.Figure 18 B show the distortion curve of the optical imaging system of embodiment 9, indicate the distortion in the case of different visual angles Sizes values.Figure 18 C show the relative illumination curve of the optical imaging system of embodiment 9, indicate different image heights on imaging surface Corresponding relative illumination.According to Figure 18 A to Figure 18 C it is found that the optical imaging system given by embodiment 9 can be realized well Image quality.

To sum up, embodiment 1 to embodiment 9 meets relationship shown in table 28 respectively.

Table 28

The application also provides a kind of imaging device, and electronics photosensitive element can be photosensitive coupling element (CCD) or complementation Property matal-oxide semiconductor element (CMOS).Imaging device can be the independent imaging equipment of such as digital camera, can also be The image-forming module being integrated on the mobile electronic devices such as mobile phone.The imaging device is equipped with optical imagery system described above System.

Above description is only the preferred embodiment of the application and the explanation to institute's application technology principle.People in the art Member should be appreciated that invention scope involved in the application, however it is not limited to technology made of the specific combination of above-mentioned technical characteristic Scheme, while should also cover in the case where not departing from the inventive concept, it is carried out by above-mentioned technical characteristic or its equivalent feature Other technical solutions of arbitrary combination and formation.Such as features described above has similar work(with (but not limited to) disclosed herein Can technical characteristic replaced mutually and the technical solution that is formed.

Claims

1. optical imaging system includes sequentially by object side to image side along optical axis：First lens, the second lens, the third lens and 4th lens, which is characterized in that

First lens, the third lens and the 4th lens all have positive light coke or negative power；

It is concave surface that second lens, which have positive light coke, image side surface,；

The image side surface of 4th lens is concave surface；

Effective half bore DT11 of the object side of first lens, the object side of second lens effective half bore DT21, effective half bore DT32 of image side surface of the third lens, the 4th lens image side surface effective half bore The Entry pupil diameters EPD of DT42 and the optical imaging system meet (DT11+DT21+DT32+DT42)/EPD≤2.4.

2. optical imaging system according to claim 1, which is characterized in that the optical imaging system further includes being set to Infrared band pass filter between 4th lens and the imaging surface of the optical imaging system, band logical wave band are 750nm To 1000nm.

3. optical imaging system according to claim 2, which is characterized in that the band logical wave band of the infrared band pass filter For 850nm to 940nm.

4. optical imaging system according to claim 1, which is characterized in that total effective focal length of the optical imaging system The Entry pupil diameters EPD of f and the optical imaging system meet f/EPD≤1.4.

5. optical imaging system according to any one of claim 1 to 4, which is characterized in that the 4th lens have Positive light coke,

The effective focal length f4 of 4th lens meets 1≤f4/f≤8 with total effective focal length f of the optical imaging system.

6. optical imaging system according to any one of claim 1 to 4, which is characterized in that the optical imaging system Total effective focal length f and the 4th lens meet 6≤f/CT4≤10 in the center thickness CT4 on the optical axis.

7. optical imaging system according to any one of claim 1 to 4, which is characterized in that the object of second lens The satisfaction of radius of curvature R 4-7≤(R3+R4)/(R3-R4) of the image side surface of the radius of curvature R 3 of side and second lens≤- 4。

8. optical imaging system according to any one of claim 1 to 4, which is characterized in that the optical imaging system Total effective focal length f, first lens effective focal length f1 and second lens effective focal length f2 meet 0.5≤| f/ f1|+|f/f2|≤1。

9. optical imaging system according to any one of claim 1 to 4, which is characterized in that second lens have It imitates focal length f2 and the radius of curvature R 4 of the image side surface of second lens meets 2≤f2/R4≤4.

10. optical imaging system according to any one of claim 1 to 4, which is characterized in that first lens are in institute The center thickness CT1 and spacing distance T23 of second lens and the third lens on the optical axis stated on optical axis is full Foot 1≤CT1/T23≤2.

11. optical imaging system according to any one of claim 1 to 4, which is characterized in that the picture of second lens The radius of curvature R 4 of side and the radius of curvature R 8 of the image side surface of the 4th lens meet 4≤(R4+R8)/(R4-R8)≤7.

12. optical imaging system includes sequentially by object side to image side along optical axis：First lens, the second lens, the third lens and 4th lens, which is characterized in that

First lens and the third lens all have positive light coke or negative power；

It is concave surface that 4th lens, which have positive light coke, image side surface,；

13. optical imaging system according to claim 12, which is characterized in that total effective coke of the optical imaging system Meet 6≤f/CT4≤10 in the center thickness CT4 on the optical axis away from f and the 4th lens.

14. optical imaging system according to claim 12, which is characterized in that the curvature of the image side surface of second lens Radius R4 and the radius of curvature R 8 of the image side surface of the 4th lens meet 4≤(R4+R8)/(R4-R8)≤7.

15. optical imaging system according to claim 14, which is characterized in that the curvature of the object side of second lens Radius R3 and the radius of curvature R 4 of the image side surface of second lens meet -7≤(R3+R4)/(R3-R4)≤- 4.

16. optical imaging system according to claim 15, which is characterized in that the effective focal length f2 of second lens with The radius of curvature R 4 of the image side surface of second lens meets 2≤f2/R4≤4.

17. optical imaging system according to claim 12, which is characterized in that total effective coke of the optical imaging system Effective focal length f2 satisfactions 0.5 away from f, the effective focal length f1 of first lens and second lens≤| f/f1 |+| f/f2 | ≤1。

18. optical imaging system according to claim 12, which is characterized in that first lens are on the optical axis Center thickness CT1 meets 1≤CT1/ with the spacing distance T23 of second lens and the third lens on the optical axis T23≤2。

19. the optical imaging system according to any one of claim 13 to 18, which is characterized in that first lens The picture of effective half bore DT11 of object side, effective half bore DT21 of the object side of second lens, the third lens Effective half bore DT42 and the optical imaging system of effective half bore DT32 of side, the image side surface of the 4th lens Entry pupil diameters EPD meets (DT11+DT21+DT32+DT42)/EPD≤2.4.

20. the optical imaging system according to any one of claim 13 to 18, which is characterized in that the optical imagery system System further includes the infrared band pass filter being set between the 4th lens and the imaging surface of the optical imaging system, band Logical wave band is 750nm to 1000nm.

21. optical imaging system according to claim 20, which is characterized in that the band logical wave of the infrared band pass filter Section is 850nm to 940nm.

22. the optical imaging system according to any one of claim 13 to 18, which is characterized in that the optical imagery system Total effective focal length f of system meets f/EPD≤1.4 with the Entry pupil diameters EPD of the optical imaging system.