CN108388006A

CN108388006A - Optical system

Info

Publication number: CN108388006A
Application number: CN201810297721.1A
Authority: CN
Inventors: 黄林; 娄琪琪
Original assignee: Zhejiang Sunny Optics Co Ltd
Current assignee: Zhejiang Sunny Optics Co Ltd
Priority date: 2018-03-30
Filing date: 2018-03-30
Publication date: 2018-08-10
Anticipated expiration: 2038-03-30
Also published as: WO2019184367A1; CN109358406B; CN108388006B; CN109358406A

Abstract

This application discloses a kind of optical system, the optical system is along optical axis by including sequentially at image side to image source side：First lens, the second lens, the third lens, the 4th lens and the 5th lens.Wherein, it is concave surface that the first lens, which have positive light coke, nearly image source side,；It is convex surface that second lens, which have positive light coke, nearly image source side,；It is convex surface that the third lens, which have negative power, nearly image source side,；4th lens have focal power, are closely concave surface at image side surface；5th lens have focal power.The effective focal length f2 of second lens and total effective focal length f of optical system meet 0 ＜ f2/f ＜ 1.

Description

Optical system

Technical field

This application involves a kind of optical systems, more specifically, this application involves it is a kind of include five lens optical system.

Background technology

In recent years, with the fast development of depth recognition technology, target object can be obtained using three-dimensional depth camera Three-dimensional position and dimension information, this augmented reality (AR) technology application in be of great significance.

Important branch one of of the coded structured light technology as depth recognition technology, technical principle are：Utilize projection lens Head module will be projected by the image of specific coding on target object；Reflected image is received using imaging receiver module Information；It handles to obtain the depth information of target object by back-end algorithm.Wherein, projection lens is known as coding structure optical depth The core element of other technology directly affects the identification range and accuracy of depth recognition.

And conventional projection camera lens, usually to eliminate various aberrations and resolution is improved by using the mode for increasing lens numbers Rate.But increasing lens numbers can cause the optics total length of projection lens to increase, and be unfavorable for the miniaturization of camera lens.In addition, one As big field angle projection lens can also have that amount of distortion is big, and the problems such as image quality difference cannot be satisfied coded structured light Requirement of the depth recognition technology to projection lens.

Invention 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 system of above-mentioned at least one disadvantage, for example, projection lens.

On the one hand, this application provides such a optical systems, and the optical system is along optical axis by image side to image source Side includes sequentially：First lens, the second lens, the third lens, the 4th lens and the 5th lens.Wherein, the first lens can have Positive light coke, nearly image source side can be concave surface；Second lens can have positive light coke, and nearly image source side can be convex surface；The Three lens can have negative power, and nearly image source side can be convex surface；4th lens have focal power, closely can be at image side surface Concave surface；5th lens have focal power.Wherein, the effective focal length f2 of the second lens and total effective focal length f of optical system can expire 0 ＜ f2/f ＜ 1 of foot.

In one embodiment, the nearly nearly image source side at image side surface to the 4th lens of the third lens is on optical axis Spacing distance Tr5r8 and the 5th lens can meet 1.2 ＜ Tr5r8/CT5 ＜ 2.3 in the center thickness CT5 on optical axis.

In one embodiment, the spacing distance T23 of the second lens and the third lens on optical axis and the third lens and Spacing distance T34 of 4th lens on optical axis can meet 0.2 ＜ T23/T34 ＜ 0.7.

In one embodiment, the radius of curvature R 4 Yu the third lens of the nearly image source side of the second lens is close at image side The radius of curvature R 5 in face can meet | R4-R5 |/| R4+R5 | ＜ 0.5.

In one embodiment, total effective coke of the radius of curvature R 8 Yu optical system of the nearly image source side of the 4th lens It can meet -1 ＜ R8/f ＜ 0 away from f.

In one embodiment, the 4th lens it is close at the intersection point of image side surface and optical axis to the 4th lens closely at image side surface Maximum effective half bore vertex nearly image source side and optical axis of distance SAG41 and the 4th lens on optical axis intersection point to the 4th Maximum effective half bore vertex distance SAG42 on optical axis of the nearly image source side of lens can meet 0.45 ＜ SAG41/SAG42 ＜ 1。

In one embodiment, the 5th lens it is close at the intersection point of image side surface and optical axis to the 5th lens closely at image side surface Maximum effective half bore vertex nearly image source side and optical axis of distance SAG51 and the 5th lens on optical axis intersection point to the 5th Maximum effective half bore vertex distance SAG52 on optical axis of the nearly image source side of lens can meet 0 ＜ SAG51/SAG52 ＜ 0.6.

In one embodiment, the intersection point of the nearly image source side of the 5th lens and optical axis is to the nearly image source side of the 5th lens Maximum effective half bore vertex on optical axis distance SAG52 and the 5th lens can meet in the center thickness CT5 on optical axis- 1.5 ＜ SAG52/CT5 ＜ -0.8.

In one embodiment, the edge thickness ET5 of the 5th lens and the 5th lens are in the center thickness CT5 on optical axis 0 ＜ ET5/CT5 ＜ 0.5 can be met.

In one embodiment, the chief ray maximum incident angle degree CRA's, the first lens of optical system is close at image side surface Half IH to spacing distance TTL of the image source face of optical system on optical axis and image source diameter diagonal line length can meet 2 ＜ (1+ TAN (CRA)) × TTL/IH ＜ 2.5.

In one embodiment, the object-side numerical aperture NA of optical system can meet NA ＜ 0.19.

In one embodiment, in the light-wave band of 800nm to 1000nm, light penetration can be more than optical system 85%.

In one embodiment, the nearly picture of the effective half bore DT12, the second lens of the nearly image source side of the first lens The nearly image source of effective half bore DT22 in source face, effective half bore DT32 of the nearly image source side of the third lens, the 4th lens Effective half bore DT42 of side and effective half bore DT52 of the nearly image source side of the 5th lens can meet DT12 ＜ DT22 ＜ DT32 ＜ DT42 ＜ DT52.

On the other hand, this application provides such a optical systems, and the optical system is along optical axis by image side to picture Source includes sequentially：First lens, the second lens, the third lens, the 4th lens and the 5th lens.Wherein, the first lens can have It can be concave surface to have positive light coke, nearly image source side；Second lens can have positive light coke, and nearly image source side can be convex surface； The third lens can have negative power, and nearly image source side can be convex surface；4th lens have focal power, closely can at image side surface For concave surface；5th lens have focal power.Wherein, the edge thickness ET5 of the 5th lens and the 5th lens are in the center on optical axis Thickness CT5 can meet 0 ＜ ET5/CT5 ＜ 0.5.

Another aspect, this application provides such a optical systems, and the optical system is along optical axis by image side to picture Source includes sequentially：First lens, the second lens, the third lens, the 4th lens and the 5th lens.Wherein, the first lens can have It can be concave surface to have positive light coke, nearly image source side；Second lens can have positive light coke, and nearly image source side can be convex surface； The third lens can have negative power, and nearly image source side can be convex surface；4th lens have focal power, closely can at image side surface For concave surface；5th lens have focal power.Wherein, the intersection point of the nearly image source side of the 5th lens and optical axis is to the nearly picture of the 5th lens Distance SAG52 and the 5th lens can in the center thickness CT5 on optical axis on optical axis on maximum effective half bore vertex in source face Meet -1.5 ＜ SAG52/CT5 ＜ -0.8.

The application uses multi-disc (for example, five) lens, each by reasonable selection lens material and reasonable distribution The focal power of mirror, face type, each lens center thickness and each lens between axis on spacing etc. so that above-mentioned optical system tool There is big visual field, minimizes, disclosure satisfy that at least one advantageous effects such as depth recognition projection demand.

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 system according to the embodiment of the present application 1；

Fig. 2A to Fig. 2 C respectively illustrates astigmatism curve, distortion curve and the relative illumination of the optical system of embodiment 1 Curve；

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

Fig. 4 A to Fig. 4 C respectively illustrate astigmatism curve, distortion curve and the relative illumination of the optical system of embodiment 2 Curve；

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

Fig. 6 A to Fig. 6 C respectively illustrate astigmatism curve, distortion curve and the relative illumination of the optical system of embodiment 3 Curve；

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

Fig. 8 A to Fig. 8 C respectively illustrate astigmatism curve, distortion curve and the relative illumination of the optical system of embodiment 4 Curve；

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

Figure 10 A to Figure 10 C respectively illustrate the astigmatism curve of the optical system of embodiment 5, distortion curve and contrast It writes music line；

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

Figure 12 A to figure 12 C respectively illustrates the astigmatism curve of the optical system of embodiment 6, distortion curve and contrasts It writes music line；

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

Figure 14 A to Figure 14 C respectively illustrate the astigmatism curve of the optical system of embodiment 7, distortion curve and contrast It writes music line.

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, the first, second equal statement is only used for a feature and another feature differentiation It comes, and does not indicate that any restrictions to feature.Therefore, discussed below without departing substantially from teachings of the present application First lens are also known as the second lens, and the second lens are also known as the first 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 the lens close to the surface of image source side in each lens Nearly image source side, close to being known as the close at image side surface of the lens at the surface of image side 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 five lens with focal power according to the optical system of the application illustrative embodiments, that is, First lens, the second lens, the third lens, the 4th lens and the 5th lens.This five lens are along optical axis by image side to picture Source sequential.

In the exemplary embodiment, it is concave surface that the first lens, which can have positive light coke, nearly image source side,；Second lens There can be positive light coke, nearly image source side can be convex surface；The third lens can have negative power, and nearly image source side can be convex Face；4th lens have positive light coke or negative power, can be closely concave surface at image side surface；5th lens have positive light coke or Negative power.

In the exemplary embodiment, the close of the first lens at image side surface can be convex surface.

In the exemplary embodiment, the close of the third lens at image side surface can be concave surface.

In the exemplary embodiment, the nearly image source side of the 4th lens can be convex surface.

In the exemplary embodiment, the optical system of the application can meet 0 ＜ f2/f ＜ 1 of conditional, wherein f2 The effective focal length of two lens, f are total effective focal length of optical system.More specifically, f2 and f can further meet 0.5 ＜ f2/f ＜ 1, for example, 0.63≤f2/f≤0.90.Rational focal power is configured with face type, advantageously ensures that the structure of optical system is tight Gather, can effectively system astigmatism, ensure the image quality balance of meridian and sagitta of arc both direction, promote image quality.

In the exemplary embodiment, the optical system of the application can meet 2 ＜ of conditional (1+TAN (CRA)) × TTL/ IH ＜ 2.5, wherein CRA is the chief ray maximum incident angle degree of optical system, and TTL is the close at image side surface to light of the first lens Distance on the axis in the image source face of system, IH are the half of image source diameter diagonal line length.More specifically, CRA, TTL and IH are into one Step can meet 2.1 ＜ (1+TAN (CRA)) × TTL/IH ＜ 2.3, for example, 2.12≤(1+TAN (CRA)) × TTL/IH≤2.28. Meet 2 ＜ of conditional (1+TAN (CRA)) × TTL/IH ＜ 2.5, is conducive to obtain larger field angle and shorter TTL, to Meets the needs of big depth recognition range and projection module miniaturization.

In the exemplary embodiment, the optical system of the application can meet conditional NA ＜ 0.19, wherein NA is optics The object-side numerical aperture of system.More specifically, NA can further meet 0.16≤NA≤0.18.Meet conditional NA ＜ 0.19, Be conducive under conditions of meeting visual field and relative illumination, obtain preferable image quality.

In the exemplary embodiment, the optical system of the application can meet 1.2 ＜ Tr5r8/CT5 ＜ 2.3 of conditional, In, Tr5r8 is distance on the axis of the nearly nearly image source side at image side surface to the 4th lens of the third lens, and CT5 is the 5th lens In the center thickness on optical axis.More specifically, Tr5r8 and CT5 can further meet 1.24≤Tr5r8/CT5≤2.21.Meet 1.2 ＜ Tr5r8/CT5 ＜ 2.3 of conditional, advantageously reduce the thickness-sensitive of camera lens, meet the requirement of camera lens machinability.

In the exemplary embodiment, the optical system of the application can meet 0.2 ＜ T23/T34 ＜ 0.7 of conditional, In, T23 is the spacing distance of the second lens and the third lens on optical axis, and T34 is the third lens and the 4th lens on optical axis Spacing distance.More specifically, T23 and T34 can further meet 0.23≤T23/T34≤0.60.Meet 0.2 ＜ of conditional T23/T34 ＜ 0.7 advantageously reduce the thickness-sensitive of camera lens, meet the requirement of camera lens miniaturization and machinability.

In the exemplary embodiment, the optical system of the application can meet conditional | R4-R5 |/| R4+R5 | ＜ 0.5, Wherein, R4 is the radius of curvature of the nearly image source side of the second lens, and R5 is the nearly radius of curvature at image side surface of the third lens.More Specifically, R4 and R5 can further meet 0.01≤| R4-R5 |/| R4+R5 |≤0.48.Meet conditional | R4-R5 |/| R4+R5 | ＜ 0.5 can effectively correct coma, reduce the eccentric sensibility of camera lens, promote image quality.

In the exemplary embodiment, the optical system of the application can meet -1 ＜ R8/f ＜ 0 of conditional, wherein R8 is The radius of curvature of the nearly image source side of 4th lens, f are total effective focal length of optical system.More specifically, R8 and f further may be used Meet -0.8 ＜ -0.3 ＜ R8/f, for example, -0.70≤R8/f≤- 0.37.Meet -1 ＜ R8/f ＜ 0 of conditional, it is ensured that light The chief ray angle CRA of system, and be conducive to the curvature of field of correction system.

In the exemplary embodiment, the optical system of the application can meet 0.45 ＜ SAG41/SAG42 ＜ 1 of conditional, Wherein, SAG41 is the close closely effective partly at the maximum of image side surface at the intersection point of image side surface and optical axis to the 4th lens of the 4th lens Distance on the axis on bore vertex, SAG42 be the 4th lens nearly image source side and optical axis intersection point to the nearly image source side of the 4th lens Distance on the axis on maximum effective half bore vertex in face.More specifically, SAG41 and SAG42 can further meet 0.46≤ SAG41/SAG42≤0.79.Meet 0.45 ＜ SAG41/SAG42 ＜ 1 of conditional, can effectively eliminate system spherical aberration, obtains High-definition image.

In the exemplary embodiment, the optical system of the application can meet 0 ＜ ET5/CT5 ＜ 0.5 of conditional, wherein ET5 is the edge thickness of the 5th lens, and CT5 is the 5th lens in the center thickness on optical axis.More specifically, ET5 and CT5 is into one Step can meet 0.3 ＜ ET5/CT5 ＜ 0.5, for example, 0.35≤ET5/CT5≤0.42.Meet 0 ＜ ET5/CT5 ＜ 0.5 of conditional, It may insure the matching of system chief ray angle CRA, and can effectively eliminate the curvature of field.

In the exemplary embodiment, the optical system of the application can meet 0 ＜ SAG51/SAG52 ＜ 0.6 of conditional, In, SAG51 be the 5th lens it is close at the intersection point of image side surface and optical axis to the 5th lens closely at image side surface maximum it is effective half mouthful Distance on the axis on diameter vertex, SAG52 be the 5th lens nearly image source side and optical axis intersection point to the nearly image source side of the 5th lens Maximum effective half bore vertex axis on distance.More specifically, SAG51 and SAG52 can further meet 0.2 ＜ SAG51/ SAG52 ＜ 0.6, for example, 0.24≤SAG51/SAG52≤0.58.Meet 0 ＜ SAG51/SAG52 ＜ 0.6, Ke Yiyou of conditional System spherical aberration is eliminated on effect ground, obtains high-definition image.

In the exemplary embodiment, the optical system of the application can meet -1.5 ＜ -0.8 ＜ SAG52/CT5 of conditional, Wherein, SAG52 is the maximum effective half of the nearly image source side of the 5th lens and intersection point to the nearly image source side of the 5th lens of optical axis Distance on the axis on bore vertex, CT5 are the 5th lens in the center thickness on optical axis.More specifically, SAG52 and CT5 are further - 1.36≤SAG52/CT5≤- 0.82 can be met.Meet -1.5 ＜ SAG52/CT5 ＜ -0.8 of conditional, it can be ensured that system master The matching of ray angles CRA, and can effectively eliminate spherical aberration.

In the exemplary embodiment, the optical system of the application is in about 800nm to the light-wave band of about 1000nm, light Line transmitance is more than 85%.It is such to be provided with conducive to the projected picture of high brightness is obtained, and reduce the aperture to receiving camera lens It is required that.

In the exemplary embodiment, the optical system of the application can meet conditional DT12 ＜ DT22 ＜ DT32 ＜ DT42 ＜ DT52, wherein DT12 is effective half bore of the nearly image source side of the first lens, and DT22 is the nearly image source side of the second lens Effective half bore, DT32 be the third lens nearly image source side effective half bore, DT42 be the 4th lens nearly image source side Effective half bore in face, DT52 are effective half bore of the nearly image source side of the 5th lens.Meet conditional DT12 ＜ DT22 ＜ DT32 ＜ DT42 ＜ DT52 can better ensure that the feasibility in structure, reduce the influence for assembling tolerance.

In the exemplary embodiment, above-mentioned optical system may also include at least one diaphragm, with the imaging of lifting system Quality.Optionally, diaphragm may be provided at between image side and the first lens.

Optionally, above-mentioned optical system may also include other well known optical projection elements, for example, prism, field lens etc..

Such as five lens can be used according to the optical system of the above embodiment of the application, pass through Rational choice lens Material and each power of lens of reasonable distribution, face type, each lens center thickness and each lens between axis on spacing Deng so that optical system has big visual field, miniaturization, can meet the advantageous effects such as depth recognition projection demand well.

In presently filed embodiment, each lens mostly use aspherical mirror.The characteristics of non-spherical lens is：From lens To lens perimeter, curvature is consecutive variations at center.With the spherical lens with constant curvature from lens centre to lens perimeter Difference, non-spherical lens have more preferably radius of curvature characteristic, have the advantages that improve and distort aberration and improvement astigmatic image error.It adopts 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 system can be changed, to obtain each result and advantage described in this specification.Though for example, It is so described by taking five lens as an example in embodiments, but the optical system is not limited to include five lens.If It needs, which may also include the lens of other quantity.

The specific embodiment for the optical 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 system of the embodiment of the present application 1.Fig. 1 is shown according to the application The structural schematic diagram of the optical system of embodiment 1.

As shown in Figure 1, according to the optical system of the application illustrative embodiments along optical axis by image side to image source side according to Sequence includes：Diaphragm STO, the first lens E1, the second lens E2, the third lens E3, the 4th lens E4 and the 5th lens E5.

First lens E1 has positive light coke, is closely convex surface at image side surface S1, nearly image source side S2 is concave surface；Second thoroughly Mirror E2 has positive light coke, is closely concave surface at image side surface S3, nearly image source side S4 is convex surface；The third lens E3 has negative light focus Degree is closely concave surface at image side surface S5, and nearly image source side S6 is convex surface；4th lens E4 has positive light coke, closely at image side Face S7 is concave surface, and nearly image source side S8 is convex surface；5th lens E5 has negative power, is closely convex surface at image side surface S9, closely Image source side S10 is concave surface.In about 800nm to about 1000nm light-wave bands, the light penetration of the optical system is more than 85%.Light from image source face S11 sequentially pass through each surface S10 to S1 and on the target object that is finally projected in space (not It shows).

Table 1 shows surface type, radius of curvature, thickness, material and the circular cone of each lens of the optical system of embodiment 1 Coefficient, wherein radius of curvature and the unit of thickness are millimeter (mm).

Table 1

As shown in Table 1, in the first lens E1 to the 5th lens E5 any one lens it is close at image side surface and nearly image source side Face 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 progress It limits：

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-S10₄、A₆、A₈、A₁₀、A₁₂、A₁₄And A₁₆。

Table 2

Table 3 provides the effective focal length f1 to f5 and optics of the total effective focal length f, each lens of optical system in embodiment 1 The object-side numerical aperture NA of system.

Parameter	f(mm)	f1(mm)	f2(mm)	f3(mm)	f4(mm)	f5(mm)	NA
								Numerical value	1.76	3.12	1.10	-2.84	11.36	-4.44	0.18

Table 3

Optical system in embodiment 1 meets：

F2/f=0.63, wherein f2 is the effective focal length of the second lens E2, and f is total effective focal length of optical system；

(1+TAN (CRA)) × TTL/IH=2.12, wherein CRA is the maximum incident angle degree of chief ray, and TTL is first saturating Distance on the nearly axis at the image source face S11 of image side surface S1 to optical system of mirror E1, IH are the half of image source diameter diagonal line length；

Tr5r8/CT5=1.77, wherein Tr5r8 is the close at the close of image side surface S5 to the 4th lens E4 of the third lens E3 Distance on the axis of image source side S8, CT5 are the 5th lens E5 in the center thickness on optical axis；

T23/T34=0.40, wherein T23 is spacing distances of the second lens E2 and the third lens E3 on optical axis, T34 For the spacing distance of the third lens E3 and the 4th lens E4 on optical axis；

| R4-R5 |/| R4+R5 |=0.04, wherein R4 is the radius of curvature of the nearly image source side S4 of the second lens E2, R5 For the nearly radius of curvature at image side surface S5 of the third lens E3；

R8/f=-0.45, wherein R8 is the radius of curvature of the nearly image source side S8 of the 4th lens E4, and f is optical system Total effective focal length；

SAG41/SAG42=0.62, wherein SAG41 be the 4th lens E4 it is close at the intersection point of image side surface S7 and optical axis extremely For 4th lens E4 closely at distance on the axis on maximum effective half bore vertex of image side surface S7, SAG42 is the nearly picture of the 4th lens E4 Distance on the intersection point of source face S8 and optical axis to the axis on maximum effective half bore vertex of the nearly image source side S8 of the 4th lens E4；

ET5/CT5=0.35, wherein ET5 is the edge thickness of the 5th lens E5, and CT5 is the 5th lens E5 on optical axis Center thickness；

SAG51/SAG52=0.37, wherein SAG51 be the 5th lens E5 it is close at the intersection point of image side surface S9 and optical axis extremely For 5th lens E5 closely at distance on the axis on maximum effective half bore vertex of image side surface S9, SAG52 is the nearly picture of the 5th lens E5 Distance on the intersection point of source face S10 and optical axis to the axis on maximum effective half bore vertex of the nearly image source side S10 of the 5th lens E5；

SAG52/CT5=-1.02, wherein the intersection point of nearly image source side S10 and optical axis that SAG52 is the 5th lens E5 are extremely Distance on the axis on maximum effective half bore vertex of the nearly image source side S10 of the 5th lens E5, CT5 are the 5th lens E5 on optical axis Center thickness；

DT12 ＜ DT22 ＜ DT32 ＜ DT42 ＜ DT52, wherein DT12 is having for the nearly image source side S2 of the first lens E1 Half bore is imitated, DT22 is effective half bore of the nearly image source side S4 of the second lens E2, and DT32 is the nearly image source of the third lens E3 Effective half bore of side S6, DT42 are effective half bore of the nearly image source side S8 of the 4th lens E4, and DT52 is the 5th lens Effective half bore of the nearly image source side S10 of E5.

Fig. 2A shows the astigmatism curve of the optical system of embodiment 1, indicates that meridianal image surface bending and sagittal image surface are curved It is bent.Fig. 2 B show the distortion curve of the optical system of embodiment 1, indicate the distortion sizes values at different image source height.Figure 2C shows the relative illumination curve of the optical system of embodiment 1, indicates the relative illumination corresponding to different image source height.Root According to Fig. 2A and Fig. 2 C it is found that the optical system given by embodiment 1 can realize good image quality.

Embodiment 2

Referring to Fig. 3 to Fig. 4 C descriptions according to the optical system of the embodiment of the present application 2.In the present embodiment and following implementation In example, for brevity, by clipped description similar to Example 1.Fig. 3 shows the light according to the embodiment of the present application 2 The structural schematic diagram of system.

As shown in figure 3, according to the optical system of the application illustrative embodiments along optical axis by image side to image source side according to Sequence includes：Diaphragm STO, the first lens E1, the second lens E2, the third lens E3, the 4th lens E4 and the 5th lens E5.

First lens E1 has positive light coke, is closely convex surface at image side surface S1, nearly image source side S2 is concave surface；Second thoroughly Mirror E2 has positive light coke, is closely convex surface at image side surface S3, nearly image source side S4 is convex surface；The third lens E3 has negative light focus Degree is closely concave surface at image side surface S5, and nearly image source side S6 is convex surface；4th lens E4 has negative power, closely at image side Face S7 is concave surface, and nearly image source side S8 is convex surface；5th lens E5 has negative power, is closely convex surface at image side surface S9, closely Image source side S10 is concave surface.In about 800nm to about 1000nm light-wave bands, the light penetration of the optical system is more than 85%.Light from image source face S11 sequentially pass through each surface S10 to S1 and on the target object that is finally projected in space (not It shows).

Table 4 shows surface type, radius of curvature, thickness, material and the circular cone of each lens of the optical system of embodiment 2 Coefficient, wherein radius of curvature and the unit of thickness are millimeter (mm).

Table 4

As shown in Table 4, in example 2, in the first lens E1 to the 5th lens E5 any one lens it is close at image side Face and nearly image source side are aspherical.Table 5 shows the high-order coefficient that can be used for each aspherical mirror in embodiment 2, In, each aspherical face type can be limited by the formula (1) provided in above-described embodiment 1.

Table 5

Table 6 provides the effective focal length f1 to f5 and optics of the total effective focal length f, each lens of optical system in embodiment 2 The object-side numerical aperture NA of system.

Parameter	f(mm)	f1(mm)	f2(mm)	f3(mm)	f4(mm)	f5(mm)	NA
								Numerical value	2.01	6.32	1.48	-76.24	-1373.97	-6.26	0.16

Table 6

Fig. 4 A show the astigmatism curve of the optical system of embodiment 2, indicate that meridianal image surface bending and sagittal image surface are curved It is bent.Fig. 4 B show the distortion curve of the optical system of embodiment 2, indicate the distortion sizes values at different image source height.Figure 4C shows the relative illumination curve of the optical system of embodiment 2, indicates the relative illumination corresponding to different image source height.Root According to Fig. 4 A and Fig. 4 C it is found that the optical system given by embodiment 2 can realize good image quality.

Embodiment 3

The optical system according to the embodiment of the present application 3 is described referring to Fig. 5 to Fig. 6 C.Fig. 5 is shown according to this Shen Please embodiment 3 optical system structural schematic diagram.

As shown in figure 5, according to the optical system of the application illustrative embodiments along optical axis by image side to image source side according to Sequence includes：Diaphragm STO, the first lens E1, the second lens E2, the third lens E3, the 4th lens E4 and the 5th lens E5.

First lens E1 has positive light coke, is closely convex surface at image side surface S1, nearly image source side S2 is concave surface；Second thoroughly Mirror E2 has positive light coke, is closely concave surface at image side surface S3, nearly image source side S4 is convex surface；The third lens E3 has negative light focus Degree is closely concave surface at image side surface S5, and nearly image source side S6 is convex surface；4th lens E4 has positive light coke, closely at image side Face S7 is concave surface, and nearly image source side S8 is convex surface；5th lens E5 has negative power, is closely concave surface at image side surface S9, closely Image source side S10 is concave surface.In about 800nm to about 1000nm light-wave bands, the light penetration of the optical system is more than 85%.Light from image source face S11 sequentially pass through each surface S10 to S1 and on the target object that is finally projected in space (not It shows).

Table 7 shows surface type, radius of curvature, thickness, material and the circular cone of each lens of the optical system of embodiment 3 Coefficient, wherein radius of curvature and the unit of thickness are millimeter (mm).

Table 7

As shown in Table 7, in embodiment 3, in the first lens E1 to the 5th lens E5 any one lens it is close at image side Face and nearly image source side are aspherical.Table 8 shows the high-order coefficient that can be used for each aspherical mirror in embodiment 3, In, 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

1.5450E-01

-1.1909E+00

3.1754E+01

-2.9049E+02

1.4772E+03

-3.4104E+03

3.0018E+03

S2

4.5276E-01

-9.0672E-01

6.6948E+00

-5.3278E+01

3.6300E+02

-1.3315E+03

2.5855E+03

S3

-6.0379E-01

4.3441E+00

-5.8689E+01

-2.2293E+01

1.3345E+03

-6.2788E+03

8.7888E+03

S4

-6.1561E-01

5.6837E+01

-6.2400E+02

3.3817E+03

-1.0640E+04

1.8375E+04

-1.2754E+04

S5

-2.1471E+00

1.1198E+02

-1.0840E+03

5.5943E+03

-1.7398E+04

3.0414E+04

-2.2567E+04

S6

-4.3976E+00

4.3727E+01

-1.8137E+02

3.8952E+02

-4.3996E+02

2.4405E+02

-5.4092E+01

S7

-5.5618E+00

1.9223E+01

-2.8697E+01

2.1970E+01

-7.5878E+00

6.6180E-01

-5.1039E-01

S8

-2.3281E+00

8.0755E+00

-2.0789E+01

3.5628E+01

-3.3029E+01

1.5030E+01

-2.6404E+00

S9

-7.1178E-01

1.5927E+00

-1.9357E+00

1.4417E+00

-6.3172E-01

1.4904E-01

-1.4617E-02

S10

-6.8061E-01

1.1507E+00

-1.6393E+00

1.4731E+00

-7.7443E-01

2.1668E-01

-2.4752E-02

Table 8

Table 9 provides the effective focal length f1 to f5 and optics of the total effective focal length f, each lens of optical system in embodiment 3 The object-side numerical aperture NA of system.

Parameter	f(mm)	f1(mm)	f2(mm)	f3(mm)	f4(mm)	f5(mm)	NA
								Numerical value	1.93	2.11	1.29	-2.17	2.23	-2.12	0.17

Table 9

Fig. 6 A show the astigmatism curve of the optical system of embodiment 3, indicate that meridianal image surface bending and sagittal image surface are curved It is bent.Fig. 6 B show the distortion curve of the optical system of embodiment 3, indicate the distortion sizes values at different image source height.Figure 6C shows the relative illumination curve of the optical system of embodiment 3, indicates the relative illumination corresponding to different image source height.Root According to Fig. 6 A and Fig. 6 C it is found that the optical system given by embodiment 3 can realize good image quality.

Embodiment 4

The optical system according to the embodiment of the present application 4 is described referring to Fig. 7 to Fig. 8 C.Fig. 7 is shown according to this Shen Please embodiment 4 optical system structural schematic diagram.

As shown in fig. 7, according to the optical system of the application illustrative embodiments along optical axis by image side to image source side according to Sequence includes：Diaphragm STO, the first lens E1, the second lens E2, the third lens E3, the 4th lens E4 and the 5th lens E5.

First lens E1 has positive light coke, is closely convex surface at image side surface S1, nearly image source side S2 is concave surface；Second thoroughly Mirror E2 has positive light coke, is closely concave surface at image side surface S3, nearly image source side S4 is convex surface；The third lens E3 has negative light focus Degree is closely concave surface at image side surface S5, and nearly image source side S6 is convex surface；4th lens E4 has negative power, closely at image side Face S7 is concave surface, and nearly image source side S8 is convex surface；5th lens E5 has positive light coke, is closely convex surface at image side surface S9, closely Image source side S10 is convex surface.In about 800nm to about 1000nm light-wave bands, the light penetration of the optical system is more than 85%.Light from image source face S11 sequentially pass through each surface S10 to S1 and on the target object that is finally projected in space (not It shows).

Table 10 shows surface type, radius of curvature, thickness, material and the circle of each lens of the optical system of embodiment 4 Bore coefficient, wherein radius of curvature and the unit of thickness are millimeter (mm).

Table 10

As shown in Table 10, in example 4, in the first lens E1 to the 5th lens E5 any one lens it is close at image side Face and nearly image source side are aspherical.Table 11 shows the high-order coefficient that can be used for each aspherical mirror in embodiment 4, In, 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

1.2577E-01

-6.3929E-01

2.3402E+01

-2.5220E+02

1.4751E+03

-3.4301E+03

2.9854E+03

S2

3.9633E-01

-1.3348E+00

1.7632E+01

-1.1230E+02

3.5345E+02

-1.3419E+03

2.4547E+03

S3

-3.8375E-02

-1.5780E+00

-6.1350E+00

1.7530E+01

1.3153E+03

-6.2806E+03

8.7888E+03

S4

-7.7898E-01

5.5541E+01

-6.1963E+02

3.3976E+03

-1.0619E+04

1.8350E+04

-1.3411E+04

S5

-4.0907E+00

1.1677E+02

-1.0910E+03

5.5824E+03

-1.7407E+04

3.0416E+04

-2.2274E+04

S6

-4.3854E+00

4.3057E+01

-1.8136E+02

3.8934E+02

-4.3961E+02

2.4529E+02

-5.2284E+01

S7

-5.3108E+00

1.9240E+01

-2.8723E+01

2.1741E+01

-7.8605E+00

6.8195E-01

1.5065E-01

S8

-2.7833E+00

8.7104E+00

-2.0862E+01

3.5438E+01

-3.3105E+01

1.5052E+01

-2.5608E+00

S9

-8.5221E-01

1.6200E+00

-1.9270E+00

1.4421E+00

-6.3218E-01

1.4898E-01

-1.4657E-02

S10

-4.7748E-01

1.0360E+00

-1.6262E+00

1.4802E+00

-7.7446E-01

2.1637E-01

-2.4730E-02

Table 11

Table 12 provides the effective focal length f1 to f5 and optics of the total effective focal length f, each lens of optical system in embodiment 4 The object-side numerical aperture NA of system.

Parameter	f(mm)	f1(mm)	f2(mm)	f3(mm)	f4(mm)	f5(mm)	NA
								Numerical value	1.90	2.00	1.30	-3.68	-2.40	2.39	0.17

Table 12

Fig. 8 A show the astigmatism curve of the optical system of embodiment 4, indicate that meridianal image surface bending and sagittal image surface are curved It is bent.Fig. 8 B show the distortion curve of the optical system of embodiment 4, indicate the distortion sizes values at different image source height.Figure 8C shows the relative illumination curve of the optical system of embodiment 4, indicates the relative illumination corresponding to different image source height.Root According to Fig. 8 A and Fig. 8 C it is found that the optical system given by embodiment 4 can realize good image quality.

Embodiment 5

The optical system according to the embodiment of the present application 5 is described referring to Fig. 9 to Figure 10 C.Fig. 9 is shown according to this Shen Please embodiment 5 optical system structural schematic diagram.

As shown in figure 9, according to the optical system of the application illustrative embodiments along optical axis by image side to image source side according to Sequence includes：Diaphragm STO, the first lens E1, the second lens E2, the third lens E3, the 4th lens E4 and the 5th lens E5.

First lens E1 has positive light coke, is closely convex surface at image side surface S1, nearly image source side S2 is concave surface；Second thoroughly Mirror E2 has positive light coke, is closely convex surface at image side surface S3, nearly image source side S4 is convex surface；The third lens E3 has negative light focus Degree is closely concave surface at image side surface S5, and nearly image source side S6 is convex surface；4th lens E4 has positive light coke, closely at image side Face S7 is concave surface, and nearly image source side S8 is convex surface；5th lens E5 has negative power, is closely concave surface at image side surface S9, closely Image source side S10 is concave surface.In about 800nm to about 1000nm light-wave bands, the light penetration of the optical system is more than 85%.Light from image source face S11 sequentially pass through each surface S10 to S1 and on the target object that is finally projected in space (not It shows).

Table 13 shows surface type, radius of curvature, thickness, material and the circle of each lens of the optical system of embodiment 5 Bore coefficient, wherein radius of curvature and the unit of thickness are millimeter (mm).

Table 13

As shown in Table 13, in embodiment 5, any one lens is close at image side in the first lens E1 to the 5th lens E5 Face and nearly image source side are aspherical.Table 14 shows the high-order coefficient that can be used for each aspherical mirror in embodiment 5, In, 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

-7.9095E-02

-7.9257E-01

2.7958E+01

-2.9281E+02

1.4386E+03

-3.3809E+03

3.0874E+03

S2

6.7312E-02

-1.6523E+00

1.1232E+01

-7.6056E+01

3.5904E+02

-1.4135E+03

2.1145E+03

S3

-4.2363E-01

-8.3369E-01

-2.3858E+01

-5.1200E+01

1.3396E+03

-6.1546E+03

9.1490E+03

S4

-1.2298E+00

5.7261E+01

-6.2525E+02

3.3809E+03

-1.0650E+04

1.8276E+04

-1.2844E+04

S5

-3.0085E+00

1.1570E+02

-1.0863E+03

5.5739E+03

-1.7433E+04

3.0426E+04

-2.2222E+04

S6

-3.8979E+00

4.3139E+01

-1.8165E+02

3.9020E+02

-4.3893E+02

2.4387E+02

-5.6190E+01

S7

-5.6525E+00

1.9444E+01

-2.8566E+01

2.2214E+01

-7.2931E+00

6.8834E-01

-2.5454E+00

S8

-2.0259E+00

7.8858E+00

-2.0795E+01

3.5692E+01

-3.2980E+01

1.5043E+01

-2.6561E+00

S9

-7.6132E-01

1.6002E+00

-1.9315E+00

1.4421E+00

-6.3184E-01

1.4891E-01

-1.4647E-02

S10

-7.0028E-01

1.1526E+00

-1.6386E+00

1.4724E+00

-7.7437E-01

2.1669E-01

-2.4691E-02

Table 14

Table 15 provides the effective focal length f1 to f5 and optics of the total effective focal length f, each lens of optical system in embodiment 5 The object-side numerical aperture NA of system.

Parameter	f(mm)	f1(mm)	f2(mm)	f3(mm)	f4(mm)	f5(mm)	NA
								Numerical value	1.98	3.75	1.78	-25.41	1.90	-1.97	0.16

Table 15

Figure 10 A show the astigmatism curve of the optical system of embodiment 5, indicate that meridianal image surface bending and sagittal image surface are curved It is bent.Figure 10 B show the distortion curve of the optical system of embodiment 5, indicate the distortion sizes values at different image source height.Figure 10C shows the relative illumination curve of the optical system of embodiment 5, indicates the relative illumination corresponding to different image source height. According to Figure 10 A and Figure 10 C it is found that the optical system given by embodiment 5 can realize good image quality.

Embodiment 6

The optical system according to the embodiment of the present application 6 is described referring to Figure 11 to Figure 12 C.Figure 11 is shown according to this Apply for the structural schematic diagram of the optical system of embodiment 6.

As shown in figure 11, according to the optical system of the application illustrative embodiments along optical axis by image side to image source side according to Sequence includes：Diaphragm STO, the first lens E1, the second lens E2, the third lens E3, the 4th lens E4 and the 5th lens E5.

First lens E1 has positive light coke, is closely convex surface at image side surface S1, nearly image source side S2 is concave surface；Second thoroughly Mirror E2 has positive light coke, is closely convex surface at image side surface S3, nearly image source side S4 is convex surface；The third lens E3 has negative light focus Degree is closely concave surface at image side surface S5, and nearly image source side S6 is convex surface；4th lens E4 has positive light coke, closely at image side Face S7 is concave surface, and nearly image source side S8 is convex surface；5th lens E5 has negative power, is closely concave surface at image side surface S9, closely Image source side S10 is convex surface.In about 800nm to about 1000nm light-wave bands, the light penetration of the optical system is more than 85%.Light from image source face S11 sequentially pass through each surface S10 to S1 and on the target object that is finally projected in space (not It shows).

Table 16 shows surface type, radius of curvature, thickness, material and the circle of each lens of the optical system of embodiment 6 Bore coefficient, wherein radius of curvature and the unit of thickness are millimeter (mm).

Table 16

As shown in Table 16, in embodiment 6, any one lens is close at image side in the first lens E1 to the 5th lens E5 Face and nearly image source side are aspherical.Table 17 shows the high-order coefficient that can be used for each aspherical mirror in embodiment 6, In, 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

-1.2505E-01

-3.4315E-01

2.8324E+01

-3.0121E+02

1.4235E+03

-3.1363E+03

2.5738E+03

S2

5.5156E-02

-1.5158E+00

1.2922E+01

-7.2277E+01

3.5429E+02

-1.5147E+03

2.5382E+03

S3

-9.8428E-02

-3.1893E+00

-1.8758E+01

-3.9951E+01

1.3186E+03

-6.2798E+03

9.5542E+03

S4

-6.9913E-01

5.7111E+01

-6.2645E+02

3.3743E+03

-1.0658E+04

1.8275E+04

-1.2785E+04

S5

-2.4824E+00

1.1459E+02

-1.0859E+03

5.5768E+03

-1.7444E+04

3.0391E+04

-2.2116E+04

S6

-4.1654E+00

4.4080E+01

-1.8078E+02

3.8954E+02

-4.4142E+02

2.4166E+02

-4.9662E+01

S7

-5.7951E+00

1.8850E+01

-2.8883E+01

2.3094E+01

-5.6934E+00

1.2713E+00

-5.7797E+00

S8

-2.0351E+00

7.6721E+00

-2.0682E+01

3.5721E+01

-3.3005E+01

1.5038E+01

-2.6464E+00

S9

-7.0727E-01

1.5936E+00

-1.9334E+00

1.4419E+00

-6.3190E-01

1.4895E-01

-1.4567E-02

S10

-5.3295E-01

1.0764E+00

-1.6362E+00

1.4766E+00

-7.7336E-01

2.1674E-01

-2.4804E-02

Table 17

Table 18 provides the effective focal length f1 to f5 and optics of the total effective focal length f, each lens of optical system in embodiment 6 The object-side numerical aperture NA of system.

Parameter	f(mm)	f1(mm)	f2(mm)	f3(mm)	f4(mm)	f5(mm)	NA
								Numerical value	2.02	3.82	1.55	-3.22	1.86	-2.58	0.16

Table 18

Figure 12 A show the astigmatism curve of the optical system of embodiment 6, indicate that meridianal image surface bending and sagittal image surface are curved It is bent.Figure 12 B show the distortion curve of the optical system of embodiment 6, indicate the distortion sizes values at different image source height.Figure 12C shows the relative illumination curve of the optical system of embodiment 6, indicates the relative illumination corresponding to different image source height. According to Figure 12 A and Figure 12 C it is found that the optical system given by embodiment 6 can realize good image quality.

Embodiment 7

The optical system according to the embodiment of the present application 7 is described referring to Figure 13 to Figure 14 C.Figure 13 is shown according to this Apply for the structural schematic diagram of the optical system of embodiment 7.

As shown in figure 13, according to the optical system of the application illustrative embodiments along optical axis by image side to image source side according to Sequence includes：Diaphragm STO, the first lens E1, the second lens E2, the third lens E3, the 4th lens E4 and the 5th lens E5.

First lens E1 has positive light coke, is closely convex surface at image side surface S1, nearly image source side S2 is concave surface；Second thoroughly Mirror E2 has positive light coke, is closely concave surface at image side surface S3, nearly image source side S4 is convex surface；The third lens E3 has negative light focus Degree is closely concave surface at image side surface S5, and nearly image source side S6 is convex surface；4th lens E4 has positive light coke, closely at image side Face S7 is concave surface, and nearly image source side S8 is convex surface；5th lens E5 has positive light coke, is closely concave surface at image side surface S9, closely Image source side S10 is convex surface.In about 800nm to about 1000nm light-wave bands, the light penetration of the optical system is more than 85%.Light from image source face S11 sequentially pass through each surface S10 to S1 and on the target object that is finally projected in space (not It shows).

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

Table 19

As shown in Table 19, in embodiment 7, any one lens is close at image side in the first lens E1 to the 5th lens E5 Face and nearly image source side are aspherical.Table 20 shows the high-order coefficient that can be used for each aspherical mirror in embodiment 7, In, 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

1.5885E-01

-1.1095E+00

2.9188E+01

-2.5757E+02

1.3402E+03

-3.4104E+03

3.0018E+03

S2

4.5647E-01

-9.1291E-01

7.1021E+00

-2.6044E+01

1.7700E+02

-1.3315E+03

2.5855E+03

S3

-3.4479E-01

5.4693E+00

-5.5412E+01

6.0501E+00

1.4744E+03

-6.2788E+03

8.7888E+03

S4

-5.9523E-01

5.6404E+01

-6.1852E+02

3.3757E+03

-1.0664E+04

1.8360E+04

-1.2510E+04

S5

-1.6232E+00

1.1100E+02

-1.0862E+03

5.6049E+03

-1.7373E+04

3.0424E+04

-2.2728E+04

S6

-4.4440E+00

4.3718E+01

-1.8059E+02

3.8959E+02

-4.4055E+02

2.4351E+02

-5.5087E+01

S7

-5.6405E+00

1.9259E+01

-2.8701E+01

2.2040E+01

-7.5889E+00

6.4142E-01

-4.1747E-01

S8

-2.2438E+00

7.8190E+00

-2.0722E+01

3.5707E+01

-3.2999E+01

1.5028E+01

-2.6723E+00

S9

-6.8580E-01

1.5900E+00

-1.9354E+00

1.4418E+00

-6.3175E-01

1.4910E-01

-1.4605E-02

S10

-5.8668E-01

1.1189E+00

-1.6428E+00

1.4748E+00

-7.7379E-01

2.1689E-01

-2.4721E-02

Table 20

Table 21 provides the effective focal length f1 to f5 and optics of the total effective focal length f, each lens of optical system in embodiment 7 The object-side numerical aperture NA of system.

Parameter	f(mm)	f1(mm)	f2(mm)	f3(mm)	f4(mm)	f5(mm)	NA
								Numerical value	1.90	2.14	1.29	-1.89	2.13	1.52	0.17

Table 21

Figure 14 A show the astigmatism curve of the optical system of embodiment 7, indicate that meridianal image surface bending and sagittal image surface are curved It is bent.Figure 14 B show the distortion curve of the optical system of embodiment 7, indicate the distortion sizes values at different image source height.Figure 14C shows the relative illumination curve of the optical system of embodiment 7, indicates the relative illumination corresponding to different image source height. According to Figure 14 A and Figure 14 C it is found that the optical system given by embodiment 7 can realize good image quality.

To sum up, embodiment 1 to embodiment 7 meets relationship shown in table 22 respectively.

Conditional embodiment	1	2	3	4	5	6	7
								f2/f	0.63	0.74	0.67	0.68	0.90	0.77	0.68
(1+TAN(CRA))×TTL/IH	2.12	2.27	2.12	2.16	2.20	2.28	2.20
								NA	0.18	0.16	0.17	0.17	0.16	0.16	0.17
Tr5r8/CT5	1.77	2.08	2.06	1.24	2.20	2.21	1.98
								T23/T34	0.40	0.50	0.32	0.23	0.56	0.60	0.38
\|R4-R5\|/\|R4+R5\|	0.04	0.37	0.01	0.17	0.44	0.48	0.07
								R8/f	-0.45	-0.50	-0.45	-0.70	-0.37	-0.43	-0.48
SAG41/SAG42	0.62	0.46	0.55	0.79	0.59	0.55	0.54
								ET5/CT5	0.35	0.38	0.38	0.38	0.39	0.40	0.42
SAG51/SAG52	0.37	0.27	0.54	0.24	0.52	0.54	0.58
								SAG52/CT5	-1.02	-0.85	-1.35	-0.82	-1.28	-1.32	-1.36

Table 22

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 system, along optical axis by including sequentially at image side to image source side：First lens, the second lens, the third lens, the 4th Lens and the 5th lens, which is characterized in that

It is concave surface that first lens, which have positive light coke, nearly image source side,；

It is convex surface that second lens, which have positive light coke, nearly image source side,；

It is convex surface that the third lens, which have negative power, nearly image source side,；

4th lens have focal power, are closely concave surface at image side surface；

5th lens have focal power；

The effective focal length f2 of second lens meets 0 ＜ f2/f ＜ 1 with total effective focal length f of the optical system.

2. optical system according to claim 1, which is characterized in that the third lens it is close at image side surface to described Spacing distance Tr5r8 of the nearly image source side of four lens on the optical axis is with the 5th lens in the center on the optical axis Thickness CT5 meets 1.2 ＜ Tr5r8/CT5 ＜ 2.3.

3. optical system according to claim 1, which is characterized in that second lens and the third lens are described The spacing distance T23 and spacing distance T34 of the third lens and the 4th lens on the optical axis on optical axis meets 0.2 ＜ T23/T34 ＜ 0.7.

4. optical system according to claim 1, which is characterized in that the curvature of the nearly image source side of second lens half The nearly radius of curvature R 5 at image side surface meets diameter R4 with the third lens | R4-R5 |/| R4+R5 | ＜ 0.5.

5. optical system according to claim 1, which is characterized in that the curvature of the nearly image source side of the 4th lens half Diameter R8 and total effective focal length f of the optical system meet -1 ＜ R8/f ＜ 0.

6. optical system according to claim 1, which is characterized in that the 4th lens it is close at image side surface and the light The intersection point of axis is to the 4th lens closely at maximum effective half bore vertex distance SAG41 and the institute on the optical axis of image side surface State the 4th lens nearly image source side and the optical axis intersection point to the nearly image source side of the 4th lens maximum it is effective half mouthful Diameter vertex distance SAG42 on the optical axis meets 0.45 ＜ SAG41/SAG42 ＜ 1.

7. optical system according to claim 1, which is characterized in that the 5th lens it is close at image side surface and the light The intersection point of axis is to the 5th lens closely at maximum effective half bore vertex distance SAG51 and the institute on the optical axis of image side surface State the 5th lens nearly image source side and the optical axis intersection point to the nearly image source side of the 5th lens maximum it is effective half mouthful Diameter vertex distance SAG52 on the optical axis meets 0 ＜ SAG51/SAG52 ＜ 0.6.

8. optical system according to claim 7, which is characterized in that the nearly image source side of the 5th lens and the light The intersection point of axis to the nearly image source side of the 5th lens maximum effective half bore vertex distance SAG52 and institute on the optical axis It states the 5th lens and meets -1.5 ＜ SAG52/CT5 ＜ -0.8 in the center thickness CT5 on the optical axis.

9. optical system according to claim 8, which is characterized in that the edge thickness ET5 of the 5th lens with it is described 5th lens meet 0 ＜ ET5/CT5 ＜ 0.5 in the center thickness CT5 on the optical axis.

10. optical system according to any one of claim 1 to 9, which is characterized in that the chief ray of the optical system Maximum incident angle degree CRA, first lens the nearly image source face at image side surface to the optical system on the optical axis Spacing distance TTL and the half IH of the image source diameter diagonal line length meet 2 ＜ (1+TAN (CRA)) × TTL/IH ＜ 2.5.

11. optical system according to any one of claim 1 to 9, which is characterized in that the object space number of the optical system Value aperture NA meets NA ＜ 0.19.

12. optical system according to any one of claim 1 to 9, which is characterized in that in the light of 800nm to 1000nm In wave wave band, the light penetration of the optical system is more than 85%.

13. optical system according to any one of claim 1 to 9, which is characterized in that the nearly image source of first lens Effective half bore DT12 of side, effective half bore DT22 of the nearly image source side of second lens, the third lens Effective half bore DT32 of nearly image source side, effective half bore DT42 of the nearly image source side of the 4th lens and described the Effective half bore DT52 of the nearly image source side of five lens meets DT12 ＜ DT22 ＜ DT32 ＜ DT42 ＜ DT52.

14. optical system, along optical axis by including sequentially at image side to image source side：First lens, the second lens, the third lens, Four lens and the 5th lens, which is characterized in that

4th lens have focal power, are closely concave surface at image side surface；

5th lens have focal power；

The edge thickness ET5 of 5th lens meets 0 ＜ with the 5th lens in the center thickness CT5 on the optical axis ET5/CT5 ＜ 0.5.

15. optical system, along optical axis by including sequentially at image side to image source side：First lens, the second lens, the third lens, Four lens and the 5th lens, which is characterized in that

4th lens have focal power, are closely concave surface at image side surface；

5th lens have focal power；

The maximum of the nearly image source side of 5th lens and the intersection point of the optical axis to the nearly image source side of the 5th lens has Imitate half bore vertex distance SAG52 and the 5th lens on the optical axis meet in the center thickness CT5 on the optical axis- 1.5 ＜ SAG52/CT5 ＜ -0.8.