CN110412728A

CN110412728A - Optical lens

Info

Publication number: CN110412728A
Application number: CN201810404839.XA
Authority: CN
Inventors: 谢前森; 姜欢; 章鲁栋; 王东方
Original assignee: Ningbo Sunny Opotech Co Ltd
Current assignee: Ningbo Sunny Opotech Co Ltd
Priority date: 2018-04-28
Filing date: 2018-04-28
Publication date: 2019-11-05
Anticipated expiration: 2038-04-28
Also published as: CN110412728B

Abstract

This application discloses optical lens.In one embodiment, which sequentially includes the first lens to the 8th lens by object side to image side along optical axis, wherein the first lens have negative power and are in meniscus shape of the convex surface towards object side；Second lens have negative power and are in meniscus shape of the convex surface towards image side；The third lens have positive light coke, and object side and image side surface are convex surface；4th lens have positive light coke and are in meniscus shape of the convex surface towards image side；5th lens have negative power, and object side and image side surface are concave surface；6th lens have positive light coke, and object side and image side surface are convex surface；7th lens have positive light coke, and object side and image side surface are convex surface；8th lens have negative power, and object side and image side surface are concave surface.High-resolution, small distortion, small chief ray angle, high picture reduction degree are helped to realize by reasonably arranging and designing eyeglass according to the optical lens of the application.

Description

Optical lens

Technical field

This application involves optical fields, and in particular to optical lens, relate more specifically to include eight pieces of lens optical frames Head.

Background technique

In recent years, people are higher and higher to the performance requirement of vehicular optical camera lens.For example, monitor or on-vehicle lens need With high resolution.

However, the optical lens of high-resolution is usually associated with the problem of distortion and relative illumination unevenness, wherein camera lens it is abnormal Become the distortion deformation degree of main reflection picture, relative illumination refers to surrounding pictures light and center picture light ratio, reflects picture Face light uniformity.

In general, obtaining high-resolution by the way that the quantity of lens is increased to 6-7 pieces or more.But this may influence light The miniaturization of camera lens, the realization of low cost are learned, and the group of each lens may be brought to found sensitive issue.

In view of this, aspherical lens can be used to correct aberration.However, for plastic aspherical element eyeglass, due to plastics heat The coefficient of expansion is larger, it is understood that there may be the problem that temperature change causes out of focus and image planes to obscure；It, may for Glass aspheric eyeglass There is a problem of that cost is excessively high.

Therefore, it is necessary to design a kind of optical frames for meeting high-resolution, small distortion, small chief ray angle, high picture reduction degree Head.

Summary of the invention

This application provides be suitable for vehicle-mounted installation, the optics of at least one drawbacks described above in the prior art can be overcome Camera lens.

The one side of the application provides such a optical lens, the optical lens along optical axis by object side to image side according to Sequence includes: that the first lens, the second lens, the third lens, the 4th lens, the 5th lens, the 6th lens, the 7th lens and the 8th are saturating Mirror, wherein the first lens have negative power, and are in meniscus shape of the convex surface towards object side；Second lens have negative light focus Degree, and be in meniscus shape of the convex surface towards image side；The third lens have positive light coke, and the object side of the third lens and picture Side is convex surface；4th lens have positive light coke, and are in meniscus shape of the convex surface towards image side；5th lens have negative Focal power, and the object side of the 5th lens and image side surface are concave surface；6th lens have positive light coke, and the 6th lens Object side and image side surface be convex surface；7th lens have positive light coke, and the object side of the 7th lens and image side surface are equal For convex surface；And the 8th lens there is negative power, and the object side of the 8th lens and image side surface are concave surface.

In certain optional embodiments, the first lens, the second lens, the third lens, the 4th lens, the 5th lens, At least two pieces in six lens, the 7th lens and the 8th lens are glued together.

In certain optional embodiments, the 4th lens, the 5th lens and the 6th lens compose three glued parts.

In certain optional embodiments, the combined focal length value F456 of the glued parts of the three of optical lens, optical lens it is whole Meet conditional: 1.5≤F456/F≤5.5 between group focal length value F.

In certain optional embodiments, diaphragm is provided between the third lens and three glued parts.

In certain optional embodiments, the 7th lens and the 8th lens compose double glued parts.

In certain optional embodiments, the whole group of the combined focal length value F78 of double glued parts of optical lens, optical lens Meet conditional between focal length value F: F78/F≤25.

In certain optional embodiments, in the second lens, the third lens, the 4th lens, the 7th lens and the 8th lens At least one piece be aspherical lens.

In certain optional embodiments, the thickness of the center curvature radius R3 of the object side of the second lens, the second lens D3, the second lens image side surface center curvature radius R4 between meet conditional: 0.65≤(R3-d3)/R4≤1.45.

In certain optional embodiments, the whole group focal length of the focal length value F2 of the second lens of optical lens, optical lens Meet conditional: -4.5≤F2/F≤- 1 between value F.

In certain optional embodiments, from the center of the object side of the first lens of optical lens to optical lens at Meet conditional between the distance TTL of image planes, the whole group focal length value F of optical lens: TTL/F≤7.5.

The second aspect of the application provides such a optical lens, and the optical lens is along optical axis by object side to image side It sequentially include: the first lens, the second lens, the third lens, the 4th lens, the 5th lens, the 6th lens, the 7th lens and the 8th Lens, wherein the first lens, the second lens, the 5th lens and the 8th lens have negative power；The third lens, the 4th lens, 6th lens and the 7th lens have positive light coke；First lens are in meniscus shape of the convex surface towards object side, and the second lens are in convex Facing towards the meniscus shape of image side；And the second center curvature radius R3 of object side of lens, the second lens thickness d 3, Meet conditional: 0.65≤(R3-d3)/R4≤1.45 between the center curvature radius R4 of the image side surface of two lens.

In certain optional embodiments, the object side of the third lens and image side surface are convex surface.

In certain optional embodiments, the 4th lens are in meniscus shape of the convex surface towards image side；The object side of 5th lens Face and image side surface are concave surface；And the 6th lens object side and image side surface be convex surface.

In certain optional embodiments, the object side of the 7th lens and image side surface are convex surface；And the 8th lens Object side and image side surface are concave surface.

Optical lens can be made by eyeglass and the design lens shape of reasonably arranging in pairs or groups using the technical solution of the application It realizes high-resolution, miniaturization and group cube just, specifically, helps to realize at least one of following beneficial effect:

1) by the special shape setting of the first lens and the second lens, help to reduce the distortion of entire optical system, Picture light uniformity is promoted, to greatly promote the picture authenticity of camera lens；

2) by reducing eyeglass by the 4th lens to the 6th lens gluing and by the 7th lens and the 8th lens gluing Quantity, reduce these eyeglasses group stand sensibility, and be conducive to shorten lens barrel length, be easy to implement optical lens Miniaturization；And

3) by the 7th lens and the 8th lens forming double glued parts can achromatism, and by the way that double glued parts are designed to With positive light coke, is conducive to converge light and reduces chief ray angle (CRA).

Detailed description of the invention

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

Fig. 1 is the structural schematic diagram for showing the optical lens according to the embodiment of the present application 1；

Fig. 2 is the structural schematic diagram for showing the optical lens according to the embodiment of the present application 2；And

Fig. 3 is the structural schematic diagram for showing the optical lens according to the embodiment of the present application 3.

Specific embodiment

It is described in detail below in conjunction with various aspects of the attached drawing to the application, to more fully understand the application.It answers Understand, these specific descriptions are only the explanations to the illustrative embodiments of the application, without limiting the scope of the present application.

In this specification in the whole text and in whole attached drawings, identical appended drawing reference indicates identical element.For ease of description, Part relevant to technical theme is only shown in attached drawing.In addition, in the accompanying drawings, for ease of description, may exaggerate some elements, The size and shape of part or part.Attached drawing is merely illustrative and and non-critical drawn to scale.

In the following, the feature of the application, principle and other aspects are described in detail.

This application involves the optical lens with eight pieces of eyeglasses, are mainly used in optical imagery, specifically, set for vehicle-mounted Standby optical imagery.

According to the application illustrative embodiments, optical lens sequentially includes: first saturating by object side to image side along optical axis Mirror, the second lens, the third lens, the 4th lens, the 5th lens, the 6th lens, the 7th lens and the 8th lens.Light is from first The object side of lens sequentially propagates through the first lens, the second lens, the third lens, the 4th lens, the 5th lens, the 6th thoroughly Mirror, the 7th lens and the 8th lens, eventually arrive at imaging surface.As needed, it may also include according to the optical lens of the application and set The optical filter between the 8th lens and imaging surface is set, to be filtered to the light with different wave length；And/or it may also include Protection glass between optical filter and imaging surface is set, to protect the inside chip of optical lens.

In the exemplary embodiment, in order to mention high-resolution, the second lens, the third lens, the 4th lens, the 7th lens and At least one piece in 8th lens is aspherical lens.Still optionally further, the aspherical lens are made of glass material.

First lens have negative power, and are in meniscus shape of the convex surface towards object side.By by the first lens design At the meniscus shape towards object space, big field rays can be collected as much as possible and feed them into rear optical system.In addition, in reality In, it is contemplated that because being installed on outdoor can suffer from the bad weathers such as sleet in use, such shape has on-vehicle lens Conducive to the landing of water droplet, reduce the influence to imaging.

Second lens have negative power, and are in meniscus shape of the convex surface towards image side.Specifically, the second lens have The design of approximate concentric circles, so that light is smaller by aberration after it, to be conducive to reduce the whole distortion of optical lens； Meanwhile so that periphery high angle scattered light to rear, this is conducive to promote illumination for smooth transition as much as possible.

Optionally, the second lens can be aspherical lens, solve image quality amount with further promotion.

In the exemplary embodiment, the thickness d 3 of the center curvature radius R3, the second lens of the object side of the second lens, Meet conditional: 0.65≤(R3-d3)/R4≤1.45 between the center curvature radius R4 of the image side surface of second lens, for example, can Further satisfaction conditional 0.85≤(R3-d3)/R4≤1.25.By meeting conditional 0.65≤(R3-d3)/R4≤1.45, Help to realize the small distortion of optical lens.

The third lens have positive light coke, and the object side of the third lens and image side surface are convex surface.By by third Lens design can converge light at the biconvex lens with positive light coke, and the light of diverging is made to can smoothly enter into rear；Meanwhile it can To balance the spherical aberration introduced by preceding two groups of eyeglasses.

Optionally, in order to promote solution image quality amount, the third lens can be aspherical lens.

4th lens have positive light coke, and are in meniscus shape of the convex surface towards image side.5th lens have negative light focus Degree, and the object side of the 5th lens and image side surface are concave surface.6th lens have positive light coke, and the object of the 6th lens Side and image side surface are convex surface.

In the exemplary embodiment, the first lens, the second lens, the third lens, the 4th lens, the 5th lens, the 6th At least two pieces in lens, the 7th lens and the 8th lens are glued together.By the way that the number of eyeglass can be reduced by eyeglass gluing Amount, the group for reducing optical lens found sensibility.

Optionally, the 4th lens, the 5th lens and the 6th lens compose three glued parts.By by the 4th lens, the 5th Lens and the 6th lens are glued, shorten the airspace of these three eyeglasses, help to reduce optical system overall length；Meanwhile subtracting Lack group between these three eyeglasses and found component, reduces these lens units because of inclination/core shift for generating during group is stood The tolerance sensitivities problem Deng caused by helps to reduce chief ray angle.In addition, " three glued part " reduce because these eyeglasses it Between reflection caused by light loss.

Still optionally further, the whole group focal length value F of the combined focal length value F456 of the three of optical lens glued parts, optical lens Between meet conditional: 1.5≤F456/F≤5.5, for example, can further satisfaction conditional: 2≤F456/F≤4.5.By full Sufficient conditional 1.5≤F456/F≤5.5 facilitate the overall length for shortening optical system, while promoting solution image quality amount.

Optionally, in order to promote solution image quality amount, the 4th lens can be aspherical lens.

It is noted that only can be designed as on one side aspherical by the 4th lens as needed, and another side is designed as Spherical surface.For example, and fiveth lens glued together in the 4th lens and the 5th lens and the 6th lens and the 6th lens are spherical surface In the case where lens, the image side surface of the 4th lens may be designed as spherical surface so that the 5th lens with rear are glued, and the 4th lens Object side may be designed as it is aspherical.

7th lens have positive light coke, and the object side of the 7th lens and image side surface are convex surface.8th lens tool There is negative power, and the object side of the 8th lens and image side surface are concave surface.By being designed in this way the 7th lens and the 8th thoroughly The focal power and shape of mirror, the 7th lens can converge light, and the light of diverging is made to can smoothly enter into rear；Later, the 8th lens are flat Slow ground transition light is allowed to finally converge to image planes.In this way, being conducive to reduce chief ray angle.

Optionally, the 7th lens and the 8th lens compose double glued parts.By the way that the 7th lens and the 8th lens are glued, Itself can with itself achromatism, reduce tolerance sensitivities, in addition can also residual fraction color difference with the color difference of balance optical system.This Outside, " double gluing parts " helps to converge light, reduces chief ray angle, correction aberration, while can reduce the group of these single eyeglasses Vertical sensibility.

Still optionally further, the whole group focal length value F of the combined focal length value F78 of double glued parts of optical lens, optical lens Between meet conditional: F78/F≤25, for example, can further satisfaction conditional: F78/F≤18.By meeting conditional F78/ F≤25 facilitate the overall length for shortening optical system, while promoting solution image quality amount.

Optionally, in order to promote solution image quality amount, the 7th lens and/or the 8th lens can be aspherical lens.

In the exemplary embodiment, diaphragm is provided between the third lens and three glued parts.Diaphragm can collect front and back light Line facilitates the bore for reducing front and back lens set, promotes image quality.

In the exemplary embodiment, the whole group focal length value F of the focal length value F2 of the second lens of optical lens, optical lens Between meet conditional: -4.5≤F2/F≤- 1, for example, can further satisfaction conditional: -4≤F2/F≤- 2.By meeting item - 4.5≤F2/F of part formula≤- 1 helps to realize the small distortion of optical lens.

In the exemplary embodiment, from the center of the object side of the first lens of optical lens to the imaging of optical lens Meet conditional between the distance TTL in face, the whole group focal length value F of optical lens: TTL/F≤7.5, for example, can further satisfaction Conditional: TTL/F≤7.By meeting conditional TTL/F≤7.5, the miniaturization of optical lens is helped to realize.

Although it is noted that describing some eyeglasses in an illustrative manner herein is aspherical lens, and describing These aspherical lens can be made of glass material, and still, this is only exemplary rather than limitation.The material and surface type of eyeglass (specifically, spherical surface or aspherical) can be combined arbitrarily as needed.For example, when paying close attention to the temperature performance of lens group, First lens to the 8th lens can be made of glass material；When paying close attention to the solution image quality amount of lens group, the first lens to Eight lens can be aspherical lens.

By reasonable design and multiple eyeglasses are arranged according to the optical lens of the application, for example, above-mentioned eight pieces of eyeglasses, it can Help to realize high-resolution, the small distortion, small chief ray angle, high picture reduction degree of optical lens.

Although the quantity is only example it is noted that it includes eight pieces of lens that the application, which shows optical lens only, Rather than it limits.For example, it will be understood by those skilled in the art that without departing from this application claims technical solution the case where Under, thus it is possible to vary the quantity of lens.

Further describe the application in conjunction with specific embodiments below with reference to accompanying drawings.

Embodiment 1

Referring to Fig. 1 description according to the optical lens of the embodiment of the present application 1.Fig. 1 is shown according to the embodiment of the present application 1 Optical lens structural schematic diagram.

As shown in Figure 1, optical lens is along optical axis from object side to sequentially including the first lens L1, the second lens at image side L2, the third lens L3, the 4th lens L4, the 5th lens L5, the 6th lens L6, the 7th lens L7 and the 8th lens L8.

First lens L1 is meniscus lens of the convex surface with negative power towards object side, and object side S1 is convex surface, Image side surface S2 is concave surface.Second lens L2 is meniscus lens of the convex surface with negative power towards image side, and object side S3 is Concave surface, image side surface S4 are convex surface.The third lens L3 is the biconvex lens with positive light coke, object side S5 and image side surface S6 It is convex surface.4th lens L4 is meniscus lens of the convex surface with positive light coke towards image side, and object side S8 is concave surface, Image side surface S9 is convex surface.5th lens L5 is the biconcave lens with negative power, and object side S9 and image side surface S10 are recessed Face.6th lens L6 is the biconvex lens with positive light coke, and object side S10 and image side surface S11 are convex surface.7th lens L7 is the biconvex lens with positive light coke, and object side S12 and image side surface S13 are convex surface.8th lens L8 is with negative The biconcave lens of focal power, object side S13 and image side surface S14 are concave surface, for example, its image side surface S14 can be at least in center It is concave surface at part.

4th lens L4, the 5th lens L5 and the 6th lens L6 compose three glued parts, therefore, the image side of the 4th lens L4 The object side S9 of face S9 and the 5th lens L5 are same surface, the object side of the image side surface S10 and the 6th lens L6 of the 5th lens L5 Face S10 is same surface.The glued glued part in pairs of 7th lens L7 and the 8th lens L8, therefore, the image side surface of the 7th lens L7 The object side S13 of S13 and the 8th lens L8 are same surface.

The rear of 8th lens L8 is provided with optical filter L9 and/or protection glass L9 ', optical filter L9 and/or protection glass Glass L9 ' includes object side S15 and image side surface S16.In optical filter L9 and/or the rear image side surface S16 of glass L9 ' is protected to be provided with Imaging surface IMA (that is, S17) passes through optical system imaging to receive.

Second lens L2, the third lens L3, the 4th lens L4 (unilateral side), the 7th lens L7 and the 8th lens L8 are aspherical Eyeglass；Specifically, only its object side S8 is aspherical, and the second lens L2, the third lens L3, the 7th lens L7 to the 4th lens L4 Two-sided with the 8th lens L8 is aspherical.In other words, the object side S3 and image side surface S4, the third lens of the second lens L2 The object side S12 and image side surface S13 of the object side S5 and image side surface S6 of L3, the object side S8 of the 4th lens L4, the 7th lens L7 And the 8th lens L8 object side S13 and image side surface S14 be it is aspherical.

Optionally, the third lens L3 and the three glued parts formed by the 4th lens L4, the 5th lens L5 and the 6th lens L6 Between be provided with diaphragm STO, to collect front and back light, thus facilitate reduce front and back lens set bore, promoted image quality.

Table 1 shows the surface parameter of each lens of the optical lens of embodiment 1, including radius of curvature R, thickness T, refraction Rate Nd and Abbe number Vd, wherein radius of curvature R and the unit of thickness T are millimeter (mm).

Table 1

By the second lens L2, the third lens L3, the 4th lens L4 (unilateral side), the 7th lens L7 and in this present embodiment Eight lens L8 are aspherical lens, and therefore, the aspherical face type Z on corresponding each surface meets following formula:

Wherein, Z (h) 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 For aspherical paraxial curvature, c=1/R, R indicate the radius of curvature of aspherical mirror；K is circular cone coefficient conic；A,B,C,D, E is high-order coefficient.

Table 2 shows the circular cone system for being applicable in surface S3-S6, S8, S12-S14 of each non-spherical lens in this present embodiment Number K and high-order coefficient A, B, C, D, E.

Table 2

Face number

K

A

B

C

D

E

3

-2.8686

-3.6022E-04

2.2061E-06

-6.3855E-10

-8.5436E-11

6.7368E-13

4

-3.3459

-1.8982E-04

1.1588E-06

-4.5179E-09

1.0393E-11

2.6284E-14

5

-3.3322

2.2961E-04

-1.4204E-06

1.9562E-08

-1.3625E-10

5.1140E-13

6

-57.0909

6.9715E-05

4.1356E-06

-5.8522E-08

3.0293E-09

-9.8841E-12

8

-284.1339

-3.8122E-04

1.3018E-05

-5.5291E-07

1.2530E-08

-7.9814E-11

12

-224.7951

5.1498E-05

-4.7635E-06

7.2997E-08

-8.9080E-10

5.4691E-12

13

5.6168

-3.2083E-04

-5.8833E-07

-2.1855E-08

1.7392E-10

-3.9015E-12

14

-7.7152

-8.3893E-05

-4.2070E-06

1.7583E-09

6.5410E-10

-3.6627E-12

Table 3 show the thickness d 3 of the second lens of the optical lens of the present embodiment, the second lens object side center The combination of radius of curvature R 3, the center curvature radius R4 of the image side surface of the second lens, the focal length value F2 of the second lens, three glued parts Focal length value F456, double gluing combined focal length value F78 of part, the whole group focal length value F of optical lens, optical lens optical length TTL (that is, distance of the imaging surface S17 from the center of the object side S1 of the first lens L1 of optical lens to optical lens).

Table 3

Parameter	d3(mm)	R3(mm)	R4(mm)	F2(mm)
					Numerical value	6.1956	-6.4921	-11.9066	-37.4228
Parameter	F456(mm)	F78(mm)	F(mm)	TTL(mm)
					Numerical value	39.9058	96.8886	10.9174	65.9503

In the present embodiment, the thickness d 3, second of the center curvature radius R3, the second lens of the object side of the second lens are saturating Meet (R3-d3)/R4=1.066 between the center curvature radius R4 of the image side surface of mirror；The focal length of second lens of optical lens Value F2, optical lens whole group focal length value F between meet F2/F=-3.428；The combined focal length value of the glued part of the three of optical lens F456, optical lens whole group focal length value F between meet F456/F=3.655；The combined focal length of double glued parts of optical lens Value F78, optical lens whole group focal length value F between meet F78/F=8.875；Optical length TTL, the optical frames of optical lens Meet TTL/F=6.041 between the whole group focal length value F of head.

Embodiment 2

Referring to Fig. 2 description according to the optical lens of the embodiment of the present application 2.Fig. 2 shows according to the embodiment of the present application 2 Optical lens structural schematic diagram.

As shown in Fig. 2, optical lens is along optical axis from object side to sequentially including the first lens L1, the second lens at image side L2, the third lens L3, the 4th lens L4, the 5th lens L5, the 6th lens L6, the 7th lens L7 and the 8th lens L8.

Table 4 shows the surface parameter of each lens of the optical lens of embodiment 2, including radius of curvature R, thickness T, refraction Rate Nd and Abbe number Vd, wherein radius of curvature R and the unit of thickness T are millimeter (mm).

Table 4

Face number	Radius of curvature R	Thickness T	Refractive index Nd	Abbe number Vd
					1	59.4729	4.1474	1.77	49.60
2	14.9174	8.2650
					3	-6.0594	6.5170	1.74	27.80
4	-11.9066	0.1500
					5	9.1688	17.2856	1.59	61.20
6	-63.5520	0.6945
					STO	It is infinitely great	3.4096
8	-36.8354	1.5346	1.74	27.80
					9	-12.6896	0.8996	1.77	49.60
10	12.6896	7.2666	1.50	81.60
					11	-9.6751	2.6031
12	49.4214	4.3409	1.69	31.20
					13	-49.4214	4.9756	1.59	61.20
14	49.4214	0.4147
					15	It is infinitely great	1.0000	1.52	64.20
16	It is infinitely great	0.9286
					IMA	It is infinitely great

By the second lens L2, the third lens L3, the 4th lens L4 (unilateral side), the 7th lens L7 and in this present embodiment Eight lens L8 are aspherical lens, and therefore, the aspherical face type Z on corresponding each surface meets above-mentioned formula (1).

Table 5 shows the circular cone system for being applicable in surface S3-S6, S8, S12-S14 of each non-spherical lens in this present embodiment Number K and high-order coefficient A, B, C, D, E.

Table 5

Face number

K

A

B

C

D

E

3

-2.4904

-3.1226E-04

2.4746E-06

-5.9649E-10

-1.1159E-10

6.7368E-13

4

-3.7074

-1.7040E-04

1.2867E-06

-4.1062E-09

6.1750E-12

2.6284E-14

5

-2.9792

2.2353E-04

-1.4334E-06

1.9942E-08

-1.3746E-10

5.1140E-13

6

-98.9416

7.6816E-06

3.8390E-06

-1.1109E-08

1.4848E-09

-9.8841E-12

8

-113.7268

-3.9958E-04

1.0956E-05

-3.9346E-07

9.6073E-09

-7.9814E-11

12

-168.9912

4.3415E-05

-4.1637E-06

6.7981E-08

-7.7459E-10

4.3974E-12

13

6.2573

-3.4915E-04

-4.0608E-06

2.4149E-08

3.1407E-10

-5.9198E-12

14

7.1590

-3.6482E-05

-7.0837E-06

2.2881E-08

8.7669E-10

-5.8526E-12

Table 6 show the thickness d 3 of the second lens of the optical lens of the present embodiment, the second lens object side center The combination of radius of curvature R 3, the center curvature radius R4 of the image side surface of the second lens, the focal length value F2 of the second lens, three glued parts Focal length value F456, double gluing combined focal length value F78 of part, the whole group focal length value F of optical lens, optical lens optical length TTL。

Table 6

Parameter	d3(mm)	R3(mm)	R4(mm)	F2(mm)
					Numerical value	6.5170	-6.0594	-11.9066	-31.5554
Parameter	F456(mm)	F78(mm)	F(mm)	TTL(mm)
					Numerical value	52.1940	195.5640	12.5433	64.4328

In the present embodiment, the thickness d 3, second of the center curvature radius R3, the second lens of the object side of the second lens are saturating Meet (R3-d3)/R4=1.056 between the center curvature radius R4 of the image side surface of mirror；The focal length of second lens of optical lens Value F2, optical lens whole group focal length value F between meet F2/F=-2.516；The combined focal length value of the glued part of the three of optical lens F456, optical lens whole group focal length value F between meet F456/F=4.161；The combined focal length of double glued parts of optical lens Value F78, optical lens whole group focal length value F between meet F78/F=15.591；Optical length TTL, the optical frames of optical lens Meet TTL/F=5.137 between the whole group focal length value F of head.

Embodiment 3

Referring to Fig. 3 description according to the optical lens of the embodiment of the present application 3.Fig. 3 is shown according to the embodiment of the present application 3 Optical lens structural schematic diagram.

As shown in figure 3, optical lens is along optical axis from object side to sequentially including the first lens L1, the second lens at image side L2, the third lens L3, the 4th lens L4, the 5th lens L5, the 6th lens L6, the 7th lens L7 and the 8th lens L8.

Table 7 shows the surface parameter of each lens of the optical lens of embodiment 3, including radius of curvature R, thickness T, refraction Rate Nd and Abbe number Vd, wherein radius of curvature R and the unit of thickness T are millimeter (mm).

Table 7

Face number	Radius of curvature R	Thickness T	Refractive index Nd	Abbe number Vd
					1	59.4729	3.1669	1.74	49.40
2	12.7166	9.1779
					3	-6.5366	5.9894	1.77	49.60
4	-11.9066	0.1000
					5	9.0470	17.1012	1.50	81.60
6	-300.0000	0.5541
					STO	It is infinitely great	2.4756
8	-56.3184	3.3957	1.77	49.60
					9	-13.5261	0.8996	1.74	27.60
10	13.5261	8.4724	1.59	61.30
					11	-10.1792	2.2559
12	62.8161	4.5000	1.69	31.20
					13	-26.9501	4.4965	1.59	61.20
14	62.8161	0.4147
					15	It is infinitely great	1.0000	1.52	64.20
16	It is infinitely great	3.8303
					IMA	It is infinitely great

Table 8 shows the circular cone system for being applicable in surface S3-S6, S8, S12-S14 of each non-spherical lens in this present embodiment Number K and high-order coefficient A, B, C, D, E.

Table 8

Table 9 show the thickness d 3 of the second lens of the optical lens of the present embodiment, the second lens object side center The combination of radius of curvature R 3, the center curvature radius R4 of the image side surface of the second lens, the focal length value F2 of the second lens, three glued parts Focal length value F456, double gluing combined focal length value F78 of part, the whole group focal length value F of optical lens, optical lens optical length TTL。

Table 9

Parameter	d3(mm)	R3(mm)	R4(mm)	F2(mm)
					Numerical value	5.9894	-6.5366	-11.9066	-36.4272
Parameter	F456(mm)	F78(mm)	F(mm)	TTL(mm)
					Numerical value	22.8425	166.5610	9.8974	67.8303

In the present embodiment, the thickness d 3, second of the center curvature radius R3, the second lens of the object side of the second lens are saturating Meet (R3-d3)/R4=1.052 between the center curvature radius R4 of the image side surface of mirror；The focal length of second lens of optical lens Value F2, optical lens whole group focal length value F between meet F2/F=-3.680；The combined focal length value of the glued part of the three of optical lens F456, optical lens whole group focal length value F between meet F456/F=2.308；The combined focal length of double glued parts of optical lens Value F78, optical lens whole group focal length value F between meet F78/F=16.829；Optical length TTL, the optical frames of optical lens Meet TTL/F=6.853 between the whole group focal length value F of head.

To sum up, embodiment 1 to embodiment 3 meets relationship shown in following table 10 respectively.

Table 10

Conditional embodiment	1	2	3
				(R3-d3)/R4	1.066	1.056	1.052
F2/F	-3.428	-2.516	-3.680
				F456/F	3.655	4.161	2.308
F78/F	8.875	15.591	16.829
				TTL/F	6.041	5.137	6.853

It should be noted that in the absence of conflict, the feature in embodiment and embodiment in the application can To be combined with each other.

In herein in the whole text, term is not limited to meaning defined by literal go up, but is not departing from for example appended power of the application In the case that benefit requires the range limited, cover the different device for realizing same or similar function.

For example, the ordinal number noun of " first ", " second " etc. is only for distinguishing an element with another element, Without limiting its sequence or importance；The space relative terms of "upper", "lower" etc. are not limited to orientation shown in the drawings, but Including device being differently directed in use；Term "and/or" include any of one or more of related listed item and All combinations；Term "include", "comprise" and/or " having " indicate there is stated spy when used in this manual Sign, step, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, step, operation, member Part, component and/or combination thereof；Term " illustrative " is intended to indicate that example or illustration；Term " substantially ", " about " and Similar word indicates approximate rather than degree, and be intended to illustrate by by those skilled in the art will appreciate that, measured value or meter Inherent variability in calculation value；When describing the implementation of this application, term " can with " indicates that " one or more of the application is real Apply mode "；When after the list for appearing in listed feature, the term of such as "...... at least one" modifies entire list And the discrete component in non-list.In addition, in each embodiment of the application, unless in addition reversely point out, otherwise singular It may include plural reference.

It should be understood that unless otherwise defined, otherwise all terms (including technical terms and scientific terms) used herein All have meaning identical with the meaning that the application those of ordinary skill in the art are generally understood.In addition, term (such as The term defined in common dictionary) should be interpreted that with their consistent meanings of meaning in the context of related technologies, And not idealization or it is too formal in the sense that explain, unless herein clearly so limit.

Above description is only the better embodiment of the application and the explanation to present techniques principle.Art technology Personnel should be understood that application range involved in the application is not limited to skill made of the specific combination by above-mentioned technical characteristic Art scheme, in the case where not departing from the application design, the application should also cover by above-mentioned technical characteristic or its equivalent feature into Row any combination and the other technologies scheme formed.Such as features described above and the technology with similar functions disclosed herein Feature is replaced mutually and the technical solution that is formed.

Claims

1. optical lens, along optical axis by object side to image side sequentially include: the first lens, the second lens, the third lens, the 4th thoroughly Mirror, the 5th lens, the 6th lens, the 7th lens and the 8th lens,

It is characterized in that,

First lens have negative power, and are in meniscus shape of the convex surface towards object side；

Second lens have negative power, and are in meniscus shape of the convex surface towards image side；

The third lens have positive light coke, and the object side of the third lens and image side surface are convex surface；

4th lens have positive light coke, and are in meniscus shape of the convex surface towards image side；

5th lens have negative power, and the object side of the 5th lens and image side surface are concave surface；

6th lens have positive light coke, and the object side of the 6th lens and image side surface are convex surface；

7th lens have positive light coke, and the object side of the 7th lens and image side surface are convex surface；And

8th lens have negative power, and the object side of the 8th lens and image side surface are concave surface.

2. optical lens according to claim 1, which is characterized in that first lens, second lens, described In three lens, the 4th lens, the 5th lens, the 6th lens, the 7th lens and the 8th lens At least two pieces glued together.

3. optical lens according to claim 2, which is characterized in that the 4th lens, the 5th lens and described 6th lens compose three glued parts.

4. optical lens according to claim 3, which is characterized in that the combined focal length of the glued part of the three of the optical lens Value F456, the optical lens whole group focal length value F between meet conditional: 1.5≤F456/F≤5.5.

5. optical lens according to claim 3, which is characterized in that set between the third lens and the three glued part It is equipped with diaphragm.

6. optical lens according to claim 2, which is characterized in that the 7th lens and the 8th lens compose Double gluing parts.

7. optical lens according to claim 6, which is characterized in that the combined focal length of double glued parts of the optical lens Value F78, the optical lens whole group focal length value F between meet conditional: F78/F≤25.

8. optical lens according to claim 1, which is characterized in that second lens, the third lens, described At least one piece in four lens, the 7th lens and the 8th lens is aspherical lens.

9. optical lens according to claim 1 to 8, which is characterized in that the object side of second lens Center curvature radius R3, the thickness d 3 of second lens, second lens image side surface center curvature radius R4 between Meet conditional: 0.65≤(R3-d3)/R4≤1.45.

10. optical lens according to claim 1 to 8, which is characterized in that the second of the optical lens is thoroughly Meet conditional: -4.5≤F2/F≤- 1 between the focal length value F2 of mirror, the whole group focal length value F of the optical lens.

11. optical lens according to claim 1 to 8, which is characterized in that from the first of the optical lens The center of the object side of lens to the distance TTL of imaging surface of the optical lens, the optical lens whole group focal length value F it Between meet conditional: TTL/F≤7.5.

It by object side to image side sequentially include: the first lens, the second lens, the third lens, the 4th along optical axis 12. optical lens Lens, the 5th lens, the 6th lens, the 7th lens and the 8th lens,

It is characterized in that,

First lens, second lens, the 5th lens and the 8th lens have negative power；

The third lens, the 4th lens, the 6th lens and the 7th lens have positive light coke；

First lens are in meniscus shape of the convex surface towards object side, and second lens are in falcate of the convex surface towards image side Shape；And

The center curvature radius R3 of the object side of second lens, the thickness ds 3 of second lens, second lens Meet conditional: 0.65≤(R3-d3)/R4≤1.45 between the center curvature radius R4 of image side surface.